Hojun-Cho
e217cd32d1
Ports cmd/6l/{dyn,dynout}.c into selfhost/cmd/6l/{dyn,dynout}.ww:
ET_DYN .so loading + PT_INTERP/PT_DYNAMIC ELF emission with .rela.plt,
.gnu.version_r, BIND_NOW. lsym grows dyn fields; pass.ww promotes
undefs to dyn; out.ww dispatches; main.ww takes -L/-l. The ww driver
forwards -L/-l to 6l_ww so 'ww_ww build snake.ww -L /usr/lib -l ncurses
-l c' runs without cc.
Test 996 pins byte-identical output to C-6l on snake.
'make bootstrap' gains a fourth stage with cmp ww3 == ww4, proving
ww3 is byte-stable when used as a compiler — not just a coincidental
two-stage equilibrium.
Four wwstage 6c cgen quirks surfaced and are documented in dynout.ww's
header (two-level field-write through a pointer field, (scalar, str)
tuple returns, def : str, ≤6 arg calling convention).
2599 lines
75 KiB
Plaintext
2599 lines
75 KiB
Plaintext
// os — process and filesystem facade. The body of each call lands
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// either in libwwrt.a (rt_syscall trampoline) or libc bindings,
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// depending on how the program was linked.
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@symbol("rt_syscall") fn syscall0(num: i64) i64;
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@symbol("rt_syscall") fn syscall1(num: i64, a: i64) i64;
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@symbol("rt_syscall") fn syscall2(num: i64, a: i64, b: i64) i64;
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@symbol("rt_syscall") fn syscall3(num: i64, a: i64, b: i64, c: i64) i64;
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@symbol("rt_syscall") fn syscall4(num: i64, a: i64, b: i64, c: i64, d: i64) i64;
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@symbol("rt_alloc") fn alloc(n: u64) *void;
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@symbol("rt_free") fn free(p: *void, n: u64) void;
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@symbol("rt_abort") fn abort(msg: str) void;
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// Hare-style runtime check. Caller passes a message that's printed
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// to stderr before exit(1).
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export fn assert(cond: bool, msg: str) void = {
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if (!cond) { abort(msg); };
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};
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def SYS_READ: i64 = 0;
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def SYS_WRITE: i64 = 1;
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def SYS_OPEN: i64 = 2;
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def SYS_CLOSE: i64 = 3;
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def SYS_LSEEK: i64 = 8;
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def SYS_ACCESS: i64 = 21;
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def SYS_DUP2: i64 = 33;
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def SYS_GETPID: i64 = 39;
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def SYS_FORK: i64 = 57;
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def SYS_EXECVE: i64 = 59;
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def SYS_EXIT: i64 = 60;
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def SYS_WAIT4: i64 = 61;
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def SYS_UNLINK: i64 = 87;
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// open(2) flags. Linux values, matching <fcntl.h>.
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def O_RDONLY: i32 = 0;
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def O_WRONLY: i32 = 1;
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def O_RDWR: i32 = 2;
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def O_CREAT: i32 = 64; // 0x40
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def O_TRUNC: i32 = 512; // 0x200
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// lseek(2) whence.
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def SEEK_SET: i32 = 0;
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def SEEK_CUR: i32 = 1;
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def SEEK_END: i32 = 2;
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export fn exit(code: i32) void = {
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syscall1(SYS_EXIT, code: i64);
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};
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// Raw, non-fallible primitives. These return Linux's int conventions
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// (negative = -errno, non-negative = bytes/fd/etc). Callers wanting a
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// Hare-style fallible API use the wrappers below.
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export fn write(fd: i32, buf: *u8, n: u64) i64 = {
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return syscall3(SYS_WRITE, fd: i64, buf: i64, n: i64);
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};
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export fn read(fd: i32, buf: *u8, n: u64) i64 = {
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return syscall3(SYS_READ, fd: i64, buf: i64, n: i64);
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};
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export fn close(fd: i32) i32 = {
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return syscall1(SYS_CLOSE, fd: i64): i32;
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};
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// dup2(2): make `newfd` refer to the same description as `oldfd`,
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// closing `newfd` first if open. Returns `newfd` on success or a
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// negative errno. Used by 6c_ww to redirect stdout into an output
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// file without changing the cgen emit path.
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export fn dup2(oldfd: i32, newfd: i32) i32 = {
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return syscall2(SYS_DUP2, oldfd: i64, newfd: i64): i32;
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};
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// Fallible wrappers. The error variant is a plain str (Plan 9 errstr
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// model, see lib/errors); the sum type makes success/failure explicit
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// without overloading length-zero.
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export fn tryread(fd: i32, buf: *u8, n: u64) (i64 | str) = {
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let r: i64 = read(fd, buf, n);
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if (r < 0) { return "read failed"; };
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return r;
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};
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export fn trywrite(fd: i32, buf: *u8, n: u64) (i64 | str) = {
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let r: i64 = write(fd, buf, n);
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if (r < 0) { return "write failed"; };
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return r;
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};
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// open — Linux open(2). Path must be NUL-terminated; callers using ww
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// `str` must ensure the bytes are followed by a 0 byte (literals are,
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// arena-copied paths usually are by construction). Returns -errno on
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// failure, fd otherwise. Higher-level callers prefer `tryopen`.
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export fn open(path: *u8, flags: i32, mode: i32) i32 = {
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return syscall3(SYS_OPEN, path: i64, flags: i64, mode: i64): i32;
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};
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export fn tryopen(path: *u8, flags: i32, mode: i32) (i32 | str) = {
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let fd: i32 = open(path, flags, mode);
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if (fd < 0) { return "open failed"; };
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return fd;
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};
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// lseek — set/inspect the fd's position. Returns the new offset or
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// a negative errno. We use this for fstat-free file-size discovery
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// (open ⇒ lseek to end ⇒ lseek back).
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export fn lseek(fd: i32, off: i64, whence: i32) i64 = {
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return syscall3(SYS_LSEEK, fd: i64, off, whence: i64);
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};
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// filesize — convenience: returns the byte length of an open fd by
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// seeking to the end and back. -1 on error.
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export fn filesize(fd: i32) i64 = {
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let end: i64 = lseek(fd, 0i64, SEEK_END);
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if (end < 0) { return -1i64; };
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let r: i64 = lseek(fd, 0i64, SEEK_SET);
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if (r < 0) { return -1i64; };
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return end;
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};
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// readfull — keep reading until `n` bytes have arrived or the fd
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// closes early. Returns bytes read (0..=n) or -1 on read error.
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export fn readfull(fd: i32, buf: *u8, n: u64) i64 = {
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let got: u64 = 0u64;
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for (got < n) {
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let r: i64 = read(fd, buf + got, n - got);
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if (r < 0) { return -1i64; };
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if (r == 0) { return got: i64; }; // short read: caller decides
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got += r: u64;
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};
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return got: i64;
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};
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// writefull — keep writing until `n` bytes have been accepted or the
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// fd refuses progress. Returns bytes written or -1.
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export fn writefull(fd: i32, buf: *u8, n: u64) i64 = {
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let sent: u64 = 0u64;
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for (sent < n) {
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let r: i64 = write(fd, buf + sent, n - sent);
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if (r < 0) { return -1i64; };
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if (r == 0) { return sent: i64; };
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sent += r: u64;
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};
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return sent: i64;
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};
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// ---- process and filesystem helpers used by the `ww` driver ----------
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// access(2): returns 0 if the file is reachable, negative errno
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// otherwise. mode is the bitset described in <unistd.h> (F_OK=0).
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export fn access(path: *u8, mode: i32) i32 = {
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return syscall2(SYS_ACCESS, path: i64, mode: i64): i32;
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};
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// unlink(2).
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export fn unlink(path: *u8) i32 = {
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return syscall1(SYS_UNLINK, path: i64): i32;
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};
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// getpid(2). Used by the driver to mint unique scratch paths.
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export fn getpid() i32 = {
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return syscall0(SYS_GETPID): i32;
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};
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// fork(2): 0 in the child, child pid in the parent, negative errno
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// on failure.
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export fn fork() i32 = {
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return syscall0(SYS_FORK): i32;
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};
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// execve(2): on success, does not return.
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export fn execve(path: *u8, argv: **u8, envp: **u8) i32 = {
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return syscall3(SYS_EXECVE, path: i64, argv: i64, envp: i64): i32;
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};
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// wait4(2): wait for `pid` (or any child if -1), store status in
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// `*status_out`, return the pid that ended (or negative errno).
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export fn wait4(pid: i32, status_out: *i32, options: i32, rusage: *void) i32 = {
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return syscall4(SYS_WAIT4, pid: i64, status_out: i64,
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options: i64, rusage: i64): i32;
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};
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// selfhost/cmd/wwc/mem.ww — port of cmd/wwc/mem.c.
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//
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// Bump arena allocator. Backed by the runtime page allocator
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// (rt_alloc / rt_free), no libc. Each chunk is mmap'd; when the
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// current chunk runs out we link a fresh one. Freeing the arena
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// unmaps the chain.
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//
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// Memory handed out is 16-byte aligned. The C version under
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// cmd/wwc/ is retained until the three-stage bootstrap diffs clean.
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use os;
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def ALIGN: u64 = 16u64;
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def INIT_CHUNK: u64 = 65536u64;
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def MAX_CHUNK: u64 = 4194304u64;
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def ARENA_SZ: u64 = 48u64; // sizeof(arena), kept in sync below
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type arena = struct {
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buf: *u8,
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off: u64,
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cap: u64,
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next: *arena,
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total: u64,
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};
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fn roundup(n: u64, a: u64) u64 = {
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return (n + a - 1u64) & ~(a - 1u64);
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};
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export fn newarena() *arena = {
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let a: *arena = os.alloc(ARENA_SZ): *arena;
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a.buf = os.alloc(INIT_CHUNK): *u8;
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a.off = 0u64;
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a.cap = INIT_CHUNK;
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a.next = nil;
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a.total = 0u64;
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return a;
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};
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// Grow: link a fresh chunk in front of the head. We push the old
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// chunk into `next` so the head always describes the current bump
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// region. Chunk size doubles up to MAX_CHUNK.
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fn grow(a: *arena, need: u64) bool = {
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let want: u64 = a.cap * 2u64;
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if (want < need) { want = need; };
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if (want > MAX_CHUNK) { want = MAX_CHUNK; };
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if (want < need) { return false; }; // single allocation too big
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let old: *arena = os.alloc(ARENA_SZ): *arena;
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old.buf = a.buf;
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old.off = a.off;
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old.cap = a.cap;
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old.next = a.next;
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old.total = 0u64;
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a.buf = os.alloc(want): *u8;
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a.off = 0u64;
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a.cap = want;
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a.next = old;
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return true;
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};
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export fn amalloc(a: *arena, n: u64) *void = {
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let need: u64 = roundup(n, ALIGN);
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if (need > a.cap - a.off) {
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if (!grow(a, need)) { return nil; };
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};
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let p: *u8 = a.buf + a.off;
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a.off += need;
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a.total += need;
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// Zero the region. Plan 9 amalloc zeroes; we mirror that here so
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// the checker can assume freshly allocated nodes start at 0.
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let i: u64 = 0u64;
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for (i < need) {
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p[i] = 0u8;
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i += 1u64;
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};
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return p: *void;
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};
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// astrndup — copy `n` bytes into the arena and produce a NUL-terminated
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// view. Returns a `str` whose ptr is arena-owned and whose len is `n`
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// (the trailing NUL is past `len`, so callers reading exactly n bytes
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// see no padding). Used by the lexer to capture token text.
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export fn astrndup(a: *arena, src: *u8, n: u64) str = {
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let p: *u8 = amalloc(a, n + 1u64): *u8;
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let i: u64 = 0u64;
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for (i < n) {
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p[i] = src[i];
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i += 1u64;
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};
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p[n] = 0u8;
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let r: str;
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r.ptr = p;
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r.len = n: i32;
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return r;
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};
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export fn freearena(a: *arena) void = {
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for (a != nil) {
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let next: *arena = a.next;
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os.free(a.buf: *void, a.cap);
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os.free(a: *void, ARENA_SZ);
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a = next;
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};
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};
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// selfhost/cmd/6l/sym.ww — port of cmd/6l/sym.c.
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//
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// Linker symbol table. Singly-linked list, usually a few hundred
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// entries; hashing isn't worth it yet.
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use mem;
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type lsym = struct {
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name: str,
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val: u64, // offset within combined .text once linked
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defined: i32, // 1 if some lobj defines this symbol
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owner: *lobj,
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idx_in_owner: i32,
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// Dynamic-linking fields. Set by l_resolve when an undefined sym
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// is provided by some loaded lso. plt_idx and dynsym_idx default
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// to -1 (set explicitly by l_resolve, not by amalloc-zeroing).
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is_dyn: i32,
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dyn_lib: *lso,
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dyn_version: str, // matched export's version; len 0 if none
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plt_idx: i32,
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dynsym_idx: i32,
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snext: *lsym,
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};
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type lrel = struct {
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off: u64, // offset within combined .text
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kind: i32, // R_X86_64_*
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sym: *lsym,
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addend: i64,
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rnext: *lrel,
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};
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type lobj = struct {
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path: str,
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buf: *u8, // object bytes
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len: u64,
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text_off: u64, // offset of .text in combined output
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text_size: u64,
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onext: *lobj,
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};
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// lexport — one entry per GLOBAL/WEAK symbol exported by a loaded .so.
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// Stored as a chain in the order the .so's dynsym presents them, so
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// l_so_provides_v's first-match semantics agree with the C version.
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type lexport = struct {
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name: str,
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version: str, // len 0 for unversioned globals
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enext: *lexport,
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};
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type lso = struct {
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path: str, // full filesystem path used to load
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soname: str, // DT_SONAME, or basename if missing
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exports: *lexport, // dynsym-order chain of exported names
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sonext: *lso,
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};
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type lnk = struct {
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a: *arena,
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objs: *lobj,
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sos: *lso,
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syms: *lsym,
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rels: *lrel,
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text: *u8, // combined .text
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textcap: u64,
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textlen: u64,
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errs: i32,
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dyn_n: i32, // number of syms routed through PLT
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};
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fn streq(a: str, b: str) bool = {
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if (a.len != b.len) { return false; };
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let i: i32 = 0;
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for (i < a.len) {
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if (a[i] != b[i]) { return false; };
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i += 1;
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};
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return true;
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};
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export fn l_intern(l: *lnk, name: str) *lsym = {
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let s: *lsym = l.syms;
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for (s != nil) {
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if (streq(s.name, name)) { return s; };
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s = s.snext;
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};
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let n: *lsym = amalloc(l.a, 96u64): *lsym;
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n.name = name;
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n.snext = l.syms;
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l.syms = n;
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return n;
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};
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export fn l_lookup(l: *lnk, name: str) *lsym = {
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let s: *lsym = l.syms;
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for (s != nil) {
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if (streq(s.name, name)) { return s; };
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s = s.snext;
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};
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return nil;
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};
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// selfhost/cmd/6l/obj.ww — port of cmd/6l/obj.c.
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//
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// Loads relocatable ELF64 .o files emitted by 6a, appends .text to
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// the combined image, and pulls in symbols + relocations with
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// offsets adjusted to the combined section.
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//
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// Also handles SysV `ar` archives (libwwrt.a). The two-pass loader
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// indexes members on the first pass and iteratively pulls members
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// that define currently-undefined symbols on subsequent passes.
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use os;
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use mem;
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use sym;
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def ET_REL: i32 = 1;
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def EM_X86_64: i32 = 62;
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def SHT_PROGBITS: i32 = 1;
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def SHT_SYMTAB: i32 = 2;
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def SHT_STRTAB: i32 = 3;
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def SHT_RELA: i32 = 4;
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// ---- little-endian byte readers ----------------------------------------
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// 6a/6l use straight LE on amd64. Reading via byte offsets keeps us off
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// the cgen's u16 field-load story for now (MOVZBQ exists; MOVZWQ doesn't).
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fn rd_u16(p: *u8, off: u64) u16 = {
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let b0: u16 = p[off]: u16;
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let b1: u16 = p[off + 1u64]: u16;
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return b0 | (b1 << 8u16);
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};
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fn rd_u32(p: *u8, off: u64) u32 = {
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let b0: u32 = p[off]: u32;
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let b1: u32 = p[off + 1u64]: u32;
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let b2: u32 = p[off + 2u64]: u32;
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let b3: u32 = p[off + 3u64]: u32;
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return b0 | (b1 << 8u32) | (b2 << 16u32) | (b3 << 24u32);
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};
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fn rd_u64(p: *u8, off: u64) u64 = {
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let lo: u64 = rd_u32(p, off): u64;
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let hi: u64 = rd_u32(p, off + 4u64): u64;
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return lo | (hi << 32u64);
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};
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// ---- ELF64 section header offsets (40 bytes total) --------------------
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def SHDR_SIZE: u64 = 64u64; // sizeof(Shdr) per ELF64 spec
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def SHDR_NAME: u64 = 0u64;
|
|
def SHDR_TYPE: u64 = 4u64;
|
|
def SHDR_OFFSET: u64 = 24u64;
|
|
def SHDR_SIZE_F: u64 = 32u64;
|
|
def SHDR_LINK: u64 = 40u64;
|
|
|
|
// ELF64 ehdr field offsets
|
|
def EHDR_SIZE: u64 = 64u64;
|
|
def EHDR_TYPE: u64 = 16u64;
|
|
def EHDR_MACHINE: u64 = 18u64;
|
|
def EHDR_SHOFF: u64 = 40u64;
|
|
def EHDR_SHENTSIZE: u64 = 58u64;
|
|
def EHDR_SHNUM: u64 = 60u64;
|
|
def EHDR_SHSTRNDX: u64 = 62u64;
|
|
|
|
// ELF64 sym entry: 24 bytes
|
|
def SYM_SIZE: u64 = 24u64;
|
|
def SYM_NAME: u64 = 0u64;
|
|
def SYM_INFO: u64 = 4u64;
|
|
def SYM_SHNDX: u64 = 6u64;
|
|
def SYM_VALUE: u64 = 8u64;
|
|
|
|
// ELF64 RELA entry: 24 bytes
|
|
def RELA_SIZE: u64 = 24u64;
|
|
def RELA_OFFSET: u64 = 0u64;
|
|
def RELA_INFO: u64 = 8u64;
|
|
def RELA_ADDEND: u64 = 16u64;
|
|
|
|
// ---- file slurp --------------------------------------------------------
|
|
|
|
fn read_all(path_cs: *u8) (*u8, u64) = {
|
|
let fd: i32 = os.open(path_cs, os.O_RDONLY, 0i32);
|
|
if (fd < 0) { return nil, 0u64; };
|
|
let n: i64 = os.filesize(fd);
|
|
if (n < 0i64) { os.close(fd); return nil, 0u64; };
|
|
let buf: *u8 = os.alloc(n: u64): *u8;
|
|
let got: i64 = os.readfull(fd, buf, n: u64);
|
|
os.close(fd);
|
|
if (got != n) { return nil, 0u64; };
|
|
return buf, n: u64;
|
|
};
|
|
|
|
// ---- text buffer growth ------------------------------------------------
|
|
|
|
fn emit_text(l: *lnk, src: *u8, n: u64) void = {
|
|
if (l.textlen + n > l.textcap) {
|
|
let nc: u64 = l.textcap;
|
|
if (nc == 0u64) { nc = 4096u64; };
|
|
for (nc < l.textlen + n) { nc = nc * 2u64; };
|
|
// Grow by mmap'ing a fresh region and copying. The old buffer
|
|
// is leaked into the page allocator; for a linker run this is
|
|
// trivial waste.
|
|
let nb: *u8 = os.alloc(nc): *u8;
|
|
let i: u64 = 0u64;
|
|
for (i < l.textlen) {
|
|
nb[i] = l.text[i];
|
|
i += 1u64;
|
|
};
|
|
l.text = nb;
|
|
l.textcap = nc;
|
|
};
|
|
let i: u64 = 0u64;
|
|
for (i < n) {
|
|
l.text[l.textlen + i] = src[i];
|
|
i += 1u64;
|
|
};
|
|
l.textlen += n;
|
|
};
|
|
|
|
// ---- C-string helpers --------------------------------------------------
|
|
|
|
fn cstrlen(p: *u8) u64 = {
|
|
let n: u64 = 0u64;
|
|
for (p[n] != 0u8) { n += 1u64; };
|
|
return n;
|
|
};
|
|
|
|
fn cstr_eq(p: *u8, lit: str) bool = {
|
|
let n: u64 = lit.len: u64;
|
|
let i: u64 = 0u64;
|
|
for (i < n) {
|
|
let li: i32 = i: i32;
|
|
if (p[i] != lit[li]) { return false; };
|
|
i += 1u64;
|
|
};
|
|
if (p[i] != 0u8) { return false; };
|
|
return true;
|
|
};
|
|
|
|
// Build a ww str from a NUL-terminated *u8 (for passing to l_intern).
|
|
fn cstr_to_str(a: *arena, p: *u8) str = {
|
|
let n: u64 = cstrlen(p);
|
|
return astrndup(a, p, n);
|
|
};
|
|
|
|
// ---- archive (SysV ar) types and helpers -------------------------------
|
|
//
|
|
// Each archive member starts with a 60-byte ar_hdr. The fields we care
|
|
// about are the first byte (member type) and the size at offset 48 (a
|
|
// 10-byte, space-padded decimal). Member bodies are 2-byte aligned.
|
|
|
|
type defent = struct {
|
|
name: str,
|
|
dnext: *defent,
|
|
};
|
|
|
|
type armember = struct {
|
|
data: *u8, // arena copy of the member's ELF bytes
|
|
size: u64,
|
|
defs: *defent, // linked list of defined globals
|
|
loaded: i32,
|
|
mnext: *armember,
|
|
};
|
|
|
|
fn is_archive(p: *u8, len: u64) bool = {
|
|
if (len < 8u64) { return false; };
|
|
if (p[0u64] != 33u8) { return false; }; // '!'
|
|
if (p[1u64] != 60u8) { return false; }; // '<'
|
|
if (p[2u64] != 97u8) { return false; }; // 'a'
|
|
if (p[3u64] != 114u8) { return false; }; // 'r'
|
|
if (p[4u64] != 99u8) { return false; }; // 'c'
|
|
if (p[5u64] != 104u8) { return false; }; // 'h'
|
|
if (p[6u64] != 62u8) { return false; }; // '>'
|
|
if (p[7u64] != 10u8) { return false; }; // '\n'
|
|
return true;
|
|
};
|
|
|
|
// ar_field — parse a space-padded decimal integer of width n.
|
|
fn ar_field(p: *u8, n: u64) u64 = {
|
|
let v: u64 = 0u64;
|
|
let i: u64 = 0u64;
|
|
for (i < n) {
|
|
let c: u8 = p[i];
|
|
if (c < 48u8) { return v; }; // space, NUL, etc.
|
|
if (c > 57u8) { return v; };
|
|
v = v * 10u64 + ((c - 48u8): u64);
|
|
i += 1u64;
|
|
};
|
|
return v;
|
|
};
|
|
|
|
// elf_globals — return a linked list of names of globally-defined
|
|
// (STB_GLOBAL) symbols whose section is `.text`. Names are arena
|
|
// copies, so the source ELF buffer can be freed afterward.
|
|
fn elf_globals(a: *arena, buf: *u8, len: u64) *defent = {
|
|
if (len < EHDR_SIZE) { return nil; };
|
|
if (buf[0u64] != 127u8) { return nil; };
|
|
if (buf[1u64] != 69u8) { return nil; };
|
|
if (buf[2u64] != 76u8) { return nil; };
|
|
if (buf[3u64] != 70u8) { return nil; };
|
|
|
|
let shoff: u64 = rd_u64(buf, EHDR_SHOFF);
|
|
let shnum: u32 = rd_u16(buf, EHDR_SHNUM): u32;
|
|
let shstrndx: u32 = rd_u16(buf, EHDR_SHSTRNDX): u32;
|
|
|
|
let shstr_sh_off: u64 = rd_u64(buf, shoff + (shstrndx: u64) * SHDR_SIZE + SHDR_OFFSET);
|
|
let shstr: *u8 = buf + shstr_sh_off;
|
|
|
|
let idx_text: i32 = -1;
|
|
let idx_symtab: i32 = -1;
|
|
let i: u32 = 0u32;
|
|
for (i < shnum) {
|
|
let sh_off: u64 = shoff + (i: u64) * SHDR_SIZE;
|
|
let sh_type: u32 = rd_u32(buf, sh_off + SHDR_TYPE);
|
|
let sh_name: u32 = rd_u32(buf, sh_off + SHDR_NAME);
|
|
let nm: *u8 = shstr + (sh_name: u64);
|
|
if (sh_type == SHT_PROGBITS: u32) {
|
|
if (cstr_eq(nm, ".text")) { idx_text = i: i32; };
|
|
};
|
|
if (sh_type == SHT_SYMTAB: u32) { idx_symtab = i: i32; };
|
|
i += 1u32;
|
|
};
|
|
if (idx_text < 0) { return nil; };
|
|
if (idx_symtab < 0) { return nil; };
|
|
|
|
let sym_sh: u64 = shoff + (idx_symtab: u64) * SHDR_SIZE;
|
|
let sym_off: u64 = rd_u64(buf, sym_sh + SHDR_OFFSET);
|
|
let sym_size: u64 = rd_u64(buf, sym_sh + SHDR_SIZE_F);
|
|
let sym_link: u32 = rd_u32(buf, sym_sh + SHDR_LINK);
|
|
let nsyms: u64 = sym_size / SYM_SIZE;
|
|
|
|
let str_sh: u64 = shoff + (sym_link: u64) * SHDR_SIZE;
|
|
let str_off: u64 = rd_u64(buf, str_sh + SHDR_OFFSET);
|
|
let strtab: *u8 = buf + str_off;
|
|
|
|
let head: *defent = nil;
|
|
let si: u64 = 1u64;
|
|
for (si < nsyms) {
|
|
let sym_p: u64 = sym_off + si * SYM_SIZE;
|
|
let st_name: u32 = rd_u32(buf, sym_p + SYM_NAME);
|
|
let st_info: u8 = buf[sym_p + SYM_INFO];
|
|
let st_shndx: u16 = rd_u16(buf, sym_p + SYM_SHNDX);
|
|
let bind: u32 = (st_info: u32) >> 4u32;
|
|
// STB_GLOBAL = 1; defined in .text.
|
|
if (bind == 1u32) {
|
|
if (st_shndx != 0u16) {
|
|
if ((st_shndx: i32) == idx_text) {
|
|
let nm_p: *u8 = strtab + (st_name: u64);
|
|
if (nm_p[0u64] != 0u8) {
|
|
let nm: str = cstr_to_str(a, nm_p);
|
|
let de: *defent = amalloc(a, 32u64): *defent;
|
|
de.name = nm;
|
|
de.dnext = head;
|
|
head = de;
|
|
};
|
|
};
|
|
};
|
|
};
|
|
si += 1u64;
|
|
};
|
|
return head;
|
|
};
|
|
|
|
// member_defines_undef — true if any of m's defined globals matches a
|
|
// currently-undefined symbol in the linker's symbol table. Names not
|
|
// already interned are uninteresting (the link doesn't need them yet).
|
|
fn member_defines_undef(l: *lnk, m: *armember) bool = {
|
|
let de: *defent = m.defs;
|
|
for (de != nil) {
|
|
let s: *lsym = l_lookup(l, de.name);
|
|
if (s != nil) {
|
|
if (s.defined == 0) { return true; };
|
|
};
|
|
de = de.dnext;
|
|
};
|
|
return false;
|
|
};
|
|
|
|
// load_archive — port of cmd/6l/obj.c:load_archive.
|
|
//
|
|
// Pass 1 indexes every regular member. Pass 2 iteratively pulls in any
|
|
// member that supplies a currently-undefined symbol; each pull may
|
|
// introduce fresh undefs, so we loop until quiescent.
|
|
fn load_archive(l: *lnk, path_cs: *u8, buf: *u8, len: u64) i32 = {
|
|
let head: *armember = nil;
|
|
let tail: *armember = nil;
|
|
let pos: u64 = 8u64; // past "!<arch>\n"
|
|
for (pos + 60u64 <= len) {
|
|
let hdr_size: u64 = ar_field(buf + pos + 48u64, 10u64);
|
|
let hdr_end: u64 = pos + 60u64;
|
|
if (hdr_end + hdr_size > len) { break; };
|
|
let first: u8 = buf[pos];
|
|
// Skip the symbol table ('/'), long-name table ('//'), and
|
|
// any padding entries (NUL or space leading byte).
|
|
if (first != 47u8) { if (first != 0u8) { if (first != 32u8) {
|
|
let m: *armember = amalloc(l.a, 48u64): *armember;
|
|
m.size = hdr_size;
|
|
let mb: *u8 = amalloc(l.a, hdr_size): *u8;
|
|
let i: u64 = 0u64;
|
|
for (i < hdr_size) {
|
|
mb[i] = buf[hdr_end + i];
|
|
i += 1u64;
|
|
};
|
|
m.data = mb;
|
|
m.defs = elf_globals(l.a, mb, hdr_size);
|
|
m.loaded = 0;
|
|
m.mnext = nil;
|
|
if (head == nil) { head = m; }
|
|
else { tail.mnext = m; };
|
|
tail = m;
|
|
}; }; };
|
|
pos = hdr_end + hdr_size;
|
|
if ((hdr_size & 1u64) != 0u64) { pos = pos + 1u64; };
|
|
};
|
|
|
|
let changed: i32 = 1;
|
|
for (changed != 0) {
|
|
changed = 0;
|
|
let m: *armember = head;
|
|
for (m != nil) {
|
|
if (m.loaded == 0) {
|
|
if (member_defines_undef(l, m)) {
|
|
if (load_image(l, path_cs, m.data, m.size) == 0) {
|
|
m.loaded = 1;
|
|
changed = 1;
|
|
};
|
|
};
|
|
};
|
|
m = m.mnext;
|
|
};
|
|
};
|
|
return 0;
|
|
};
|
|
|
|
// ---- main loader -------------------------------------------------------
|
|
|
|
export fn l_load(l: *lnk, path_cs: *u8) i32 = {
|
|
let bufp: *u8;
|
|
let buflen: u64;
|
|
bufp, buflen = read_all(path_cs);
|
|
if (bufp == nil) {
|
|
os.write(2, "6l: cannot read object\n".ptr, 23u64);
|
|
return -1;
|
|
};
|
|
if (is_archive(bufp, buflen)) {
|
|
return load_archive(l, path_cs, bufp, buflen);
|
|
};
|
|
return load_image(l, path_cs, bufp, buflen);
|
|
};
|
|
|
|
fn load_image(l: *lnk, path_cs: *u8, buf: *u8, len: u64) i32 = {
|
|
if (len < EHDR_SIZE) { return -1; };
|
|
// magic: 0x7f, 'E', 'L', 'F'
|
|
if (buf[0u64] != 127u8) { return -1; };
|
|
if (buf[1u64] != 69u8) { return -1; };
|
|
if (buf[2u64] != 76u8) { return -1; };
|
|
if (buf[3u64] != 70u8) { return -1; };
|
|
if (buf[4u64] != 2u8) { return -1; }; // ELFCLASS64
|
|
if (rd_u16(buf, EHDR_TYPE) != ET_REL: u16) { return -1; };
|
|
if (rd_u16(buf, EHDR_MACHINE) != EM_X86_64: u16) { return -1; };
|
|
|
|
let shoff: u64 = rd_u64(buf, EHDR_SHOFF);
|
|
let shnum: u32 = rd_u16(buf, EHDR_SHNUM): u32;
|
|
let shstrndx: u32 = rd_u16(buf, EHDR_SHSTRNDX): u32;
|
|
|
|
let shstr_sh_off: u64 = rd_u64(buf, shoff + (shstrndx: u64) * SHDR_SIZE + SHDR_OFFSET);
|
|
let shstr: *u8 = buf + shstr_sh_off;
|
|
|
|
// find .text, .symtab, .rela.text
|
|
let idx_text: i32 = -1;
|
|
let idx_symtab: i32 = -1;
|
|
let idx_rela: i32 = -1;
|
|
let i: u32 = 0u32;
|
|
for (i < shnum) {
|
|
let sh_off: u64 = shoff + (i: u64) * SHDR_SIZE;
|
|
let sh_type: u32 = rd_u32(buf, sh_off + SHDR_TYPE);
|
|
let sh_name: u32 = rd_u32(buf, sh_off + SHDR_NAME);
|
|
let nm: *u8 = shstr + (sh_name: u64);
|
|
if (sh_type == SHT_PROGBITS: u32) {
|
|
if (cstr_eq(nm, ".text")) { idx_text = i: i32; };
|
|
};
|
|
if (sh_type == SHT_SYMTAB: u32) { idx_symtab = i: i32; };
|
|
if (sh_type == SHT_RELA: u32) {
|
|
if (cstr_eq(nm, ".rela.text")) { idx_rela = i: i32; };
|
|
};
|
|
i += 1u32;
|
|
};
|
|
if (idx_text < 0) {
|
|
os.write(2, "6l: missing .text\n".ptr, 18u64);
|
|
return -1;
|
|
};
|
|
if (idx_symtab < 0) {
|
|
os.write(2, "6l: missing .symtab\n".ptr, 20u64);
|
|
return -1;
|
|
};
|
|
|
|
let text_sh: u64 = shoff + (idx_text: u64) * SHDR_SIZE;
|
|
let text_off: u64 = rd_u64(buf, text_sh + SHDR_OFFSET);
|
|
let text_size: u64 = rd_u64(buf, text_sh + SHDR_SIZE_F);
|
|
|
|
let sym_sh: u64 = shoff + (idx_symtab: u64) * SHDR_SIZE;
|
|
let sym_off: u64 = rd_u64(buf, sym_sh + SHDR_OFFSET);
|
|
let sym_size: u64 = rd_u64(buf, sym_sh + SHDR_SIZE_F);
|
|
let sym_link: u32 = rd_u32(buf, sym_sh + SHDR_LINK);
|
|
let nsyms: u64 = sym_size / SYM_SIZE;
|
|
|
|
let str_sh: u64 = shoff + (sym_link: u64) * SHDR_SIZE;
|
|
let str_off: u64 = rd_u64(buf, str_sh + SHDR_OFFSET);
|
|
let strtab: *u8 = buf + str_off;
|
|
|
|
// Track this object.
|
|
let ob: *lobj = amalloc(l.a, 64u64): *lobj;
|
|
ob.path = cstr_to_str(l.a, path_cs);
|
|
ob.buf = buf;
|
|
ob.len = len;
|
|
ob.text_off = l.textlen;
|
|
ob.text_size = text_size;
|
|
ob.onext = l.objs;
|
|
l.objs = ob;
|
|
|
|
// Append .text bytes to the combined image.
|
|
emit_text(l, buf + text_off, text_size);
|
|
|
|
// Walk symbols. We don't keep a per-object map[] of *lsym. Instead
|
|
// the reloc loop re-walks symtab and re-interns by name. Simpler
|
|
// than dancing around the cgen's u64-shift gaps.
|
|
let si: u64 = 1u64; // skip index 0 (always undef sentinel)
|
|
for (si < nsyms) {
|
|
let sym_p: u64 = sym_off + si * SYM_SIZE;
|
|
let st_name: u32 = rd_u32(buf, sym_p + SYM_NAME);
|
|
let st_shndx: u16 = rd_u16(buf, sym_p + SYM_SHNDX);
|
|
let st_value: u64 = rd_u64(buf, sym_p + SYM_VALUE);
|
|
let nm_p: *u8 = strtab + (st_name: u64);
|
|
if (nm_p[0u64] != 0u8) {
|
|
let nm: str = cstr_to_str(l.a, nm_p);
|
|
let gs: *lsym = l_intern(l, nm);
|
|
if (st_shndx != 0u16) {
|
|
if ((st_shndx: i32) == idx_text) {
|
|
if (gs.defined != 0) {
|
|
os.write(2, "6l: duplicate symbol\n".ptr, 21u64);
|
|
l.errs += 1;
|
|
} else {
|
|
gs.defined = 1;
|
|
gs.owner = ob;
|
|
gs.idx_in_owner = si: i32;
|
|
gs.val = ob.text_off + st_value;
|
|
};
|
|
};
|
|
};
|
|
};
|
|
si += 1u64;
|
|
};
|
|
|
|
// Per-object relocation collection.
|
|
if (idx_rela >= 0) {
|
|
let rela_sh: u64 = shoff + (idx_rela: u64) * SHDR_SIZE;
|
|
let rela_off: u64 = rd_u64(buf, rela_sh + SHDR_OFFSET);
|
|
let rela_size: u64 = rd_u64(buf, rela_sh + SHDR_SIZE_F);
|
|
let nrel: u64 = rela_size / RELA_SIZE;
|
|
let ri: u64 = 0u64;
|
|
for (ri < nrel) {
|
|
let rp: u64 = rela_off + ri * RELA_SIZE;
|
|
let r_off: u64 = rd_u64(buf, rp + RELA_OFFSET);
|
|
let r_info: u64 = rd_u64(buf, rp + RELA_INFO);
|
|
let r_addend: u64 = rd_u64(buf, rp + RELA_ADDEND);
|
|
let r_sym_idx: u32 = (r_info >> 32u64): u32;
|
|
let r_kind: i32 = ((r_info & 4294967295u64): u32): i32;
|
|
let nr: *lrel = amalloc(l.a, 48u64): *lrel;
|
|
nr.off = ob.text_off + r_off;
|
|
nr.kind = r_kind;
|
|
nr.addend = r_addend: i64;
|
|
// Look up the referenced sym by name (re-walk symtab).
|
|
if ((r_sym_idx: u64) < nsyms) {
|
|
let s_p: u64 = sym_off + (r_sym_idx: u64) * SYM_SIZE;
|
|
let s_name: u32 = rd_u32(buf, s_p + SYM_NAME);
|
|
let s_nm: *u8 = strtab + (s_name: u64);
|
|
if (s_nm[0u64] != 0u8) {
|
|
let nm: str = cstr_to_str(l.a, s_nm);
|
|
nr.sym = l_intern(l, nm);
|
|
};
|
|
};
|
|
nr.rnext = l.rels;
|
|
l.rels = nr;
|
|
ri += 1u64;
|
|
};
|
|
};
|
|
|
|
return 0;
|
|
};
|
|
|
|
// selfhost/cmd/6l/dyn.ww — port of cmd/6l/dyn.c.
|
|
//
|
|
// Load a shared object (ET_DYN) so the linker knows which symbols it
|
|
// exports and which DT_NEEDED entry to record. We do not pull bytes
|
|
// from the .so; the dynamic loader maps it at runtime.
|
|
//
|
|
// Each call appends one lso to lnk->sos. l_so_provides_v answers
|
|
// "does this .so export the named symbol, and at which version?" —
|
|
// l_resolve uses that to promote unresolved references to dynamic.
|
|
|
|
use os;
|
|
use mem;
|
|
use sym;
|
|
|
|
def ET_DYN_SO: u16 = 3u16;
|
|
def EM_X86_64_SO: u16 = 62u16;
|
|
|
|
def SHT_DYNAMIC: u32 = 6u32;
|
|
def SHT_DYNSYM: u32 = 11u32;
|
|
// GNU extensions, sh_type values.
|
|
def SHT_GNU_VERDEF: u32 = 1879048189u32; // 0x6ffffffd
|
|
def SHT_GNU_VERNEED: u32 = 1879048190u32; // 0x6ffffffe
|
|
def SHT_GNU_VERSYM: u32 = 1879048191u32; // 0x6fffffff
|
|
|
|
def DT_NULL_TAG: i64 = 0i64;
|
|
def DT_SONAME_TAG: i64 = 14i64;
|
|
|
|
// Versym special values.
|
|
def VER_NDX_LOCAL_C: u16 = 0u16;
|
|
def VER_NDX_GLOBAL_C: u16 = 1u16;
|
|
def VERSYM_HIDDEN_C: u16 = 32768u16; // 0x8000
|
|
def VERSYM_VERSION_C: u16 = 32767u16; // 0x7fff
|
|
|
|
// ELF64 ehdr field offsets (subset)
|
|
def EH_SHOFF: u64 = 40u64;
|
|
def EH_ETYPE: u64 = 16u64;
|
|
def EH_EMACHINE: u64 = 18u64;
|
|
def EH_SHENTSIZE: u64 = 58u64;
|
|
def EH_SHNUM: u64 = 60u64;
|
|
def EH_SHSTRNDX: u64 = 62u64;
|
|
|
|
// ELF64 Shdr (64 bytes)
|
|
def SH_SIZE: u64 = 64u64;
|
|
def SH_TYPE: u64 = 4u64;
|
|
def SH_OFFSET: u64 = 24u64;
|
|
def SH_SIZE_F: u64 = 32u64;
|
|
def SH_LINK: u64 = 40u64;
|
|
def SH_ENTSIZE: u64 = 56u64;
|
|
|
|
// ELF64 Sym (24 bytes)
|
|
def SY_SIZE: u64 = 24u64;
|
|
def SY_NAME: u64 = 0u64;
|
|
def SY_INFO: u64 = 4u64;
|
|
def SY_SHNDX: u64 = 6u64;
|
|
|
|
// ELF64 Dyn (16 bytes)
|
|
def DY_SIZE: u64 = 16u64;
|
|
def DY_TAG: u64 = 0u64;
|
|
def DY_VAL: u64 = 8u64;
|
|
|
|
// Verdef (20 bytes)
|
|
def VD_SIZE: u64 = 20u64;
|
|
def VD_NDX: u64 = 4u64;
|
|
def VD_CNT: u64 = 6u64;
|
|
def VD_AUX: u64 = 12u64;
|
|
def VD_NEXT: u64 = 16u64;
|
|
|
|
// Verdaux (8 bytes)
|
|
def VA_NAME: u64 = 0u64;
|
|
def VA_NEXT: u64 = 4u64;
|
|
|
|
// ---- little-endian byte readers ---------------------------------------
|
|
|
|
fn d_u16(p: *u8, off: u64) u16 = {
|
|
let b0: u16 = p[off]: u16;
|
|
let b1: u16 = p[off + 1u64]: u16;
|
|
return b0 | (b1 << 8u16);
|
|
};
|
|
|
|
fn d_u32(p: *u8, off: u64) u32 = {
|
|
let b0: u32 = p[off]: u32;
|
|
let b1: u32 = p[off + 1u64]: u32;
|
|
let b2: u32 = p[off + 2u64]: u32;
|
|
let b3: u32 = p[off + 3u64]: u32;
|
|
return b0 | (b1 << 8u32) | (b2 << 16u32) | (b3 << 24u32);
|
|
};
|
|
|
|
fn d_u64(p: *u8, off: u64) u64 = {
|
|
let lo: u64 = d_u32(p, off): u64;
|
|
let hi: u64 = d_u32(p, off + 4u64): u64;
|
|
return lo | (hi << 32u64);
|
|
};
|
|
|
|
fn d_i64(p: *u8, off: u64) i64 = {
|
|
return d_u64(p, off): i64;
|
|
};
|
|
|
|
// ---- C-string helpers --------------------------------------------------
|
|
|
|
fn d_cstrlen(p: *u8) u64 = {
|
|
let n: u64 = 0u64;
|
|
for (p[n] != 0u8) { n += 1u64; };
|
|
return n;
|
|
};
|
|
|
|
fn d_cstr_to_str(a: *arena, p: *u8) str = {
|
|
let n: u64 = d_cstrlen(p);
|
|
return astrndup(a, p, n);
|
|
};
|
|
|
|
// basename: scan for last '/' and return pointer past it.
|
|
fn d_basename(p: *u8) *u8 = {
|
|
let n: u64 = d_cstrlen(p);
|
|
let i: u64 = n;
|
|
for (i > 0u64) {
|
|
i -= 1u64;
|
|
if (p[i] == 47u8) { // '/'
|
|
return p + i + 1u64;
|
|
};
|
|
};
|
|
return p;
|
|
};
|
|
|
|
// ---- file slurp --------------------------------------------------------
|
|
|
|
fn read_all_so(path_cs: *u8) (*u8, u64) = {
|
|
let fd: i32 = os.open(path_cs, os.O_RDONLY, 0i32);
|
|
if (fd < 0) { return nil, 0u64; };
|
|
let n: i64 = os.filesize(fd);
|
|
if (n < 0i64) { os.close(fd); return nil, 0u64; };
|
|
let buf: *u8 = os.alloc(n: u64): *u8;
|
|
let got: i64 = os.readfull(fd, buf, n: u64);
|
|
os.close(fd);
|
|
if (got != n) { return nil, 0u64; };
|
|
return buf, n: u64;
|
|
};
|
|
|
|
// ---- verdef helpers ----------------------------------------------------
|
|
|
|
// vd_name_at — walk verdef records and return the name (as *u8 into
|
|
// the .so's verstr buffer) for the entry whose vd_ndx == ndx. The name
|
|
// is the first Verdaux's vda_name (subsequent auxes are predecessor
|
|
// names). Returns nil if no entry matches.
|
|
fn vd_name_at(buf: *u8, verdef_off: u64, verdef_size: u64,
|
|
verstr: *u8, ndx: u16) *u8 = {
|
|
let off: u64 = 0u64;
|
|
for (off < verdef_size) {
|
|
let vd_p: u64 = verdef_off + off;
|
|
let vd_ndx: u16 = d_u16(buf, vd_p + VD_NDX);
|
|
let vd_aux: u32 = d_u32(buf, vd_p + VD_AUX);
|
|
let vd_next: u32 = d_u32(buf, vd_p + VD_NEXT);
|
|
if (vd_ndx == ndx) {
|
|
let aux_p: u64 = vd_p + (vd_aux: u64);
|
|
let vda_name: u32 = d_u32(buf, aux_p + VA_NAME);
|
|
return verstr + (vda_name: u64);
|
|
};
|
|
if (vd_next == 0u32) { return nil; };
|
|
off += vd_next: u64;
|
|
};
|
|
return nil;
|
|
};
|
|
|
|
// ---- entry points ------------------------------------------------------
|
|
|
|
export fn l_load_so(l: *lnk, path_cs: *u8) i32 = {
|
|
let buf: *u8;
|
|
let blen: u64;
|
|
buf, blen = read_all_so(path_cs);
|
|
if (buf == nil) {
|
|
os.write(2, "6l: cannot read .so\n".ptr, 20u64);
|
|
return -1;
|
|
};
|
|
if (blen < 64u64) {
|
|
os.write(2, "6l: short ELF\n".ptr, 14u64);
|
|
return -1;
|
|
};
|
|
if (buf[0u64] != 127u8) { return so_err("not ELF"); };
|
|
if (buf[1u64] != 69u8) { return so_err("not ELF"); };
|
|
if (buf[2u64] != 76u8) { return so_err("not ELF"); };
|
|
if (buf[3u64] != 70u8) { return so_err("not ELF"); };
|
|
if (buf[4u64] != 2u8) { return so_err("not ELFCLASS64"); };
|
|
if (d_u16(buf, EH_EMACHINE) != EM_X86_64_SO) {
|
|
return so_err("not amd64");
|
|
};
|
|
if (d_u16(buf, EH_ETYPE) != ET_DYN_SO) {
|
|
return so_err("not ET_DYN");
|
|
};
|
|
|
|
let shoff: u64 = d_u64(buf, EH_SHOFF);
|
|
let shnum: u32 = d_u16(buf, EH_SHNUM): u32;
|
|
if (shoff == 0u64) { return so_err("stripped .so unsupported"); };
|
|
if (shnum == 0u32) { return so_err("stripped .so unsupported"); };
|
|
|
|
// Locate the four sections we care about.
|
|
let idx_dynsym: i32 = -1;
|
|
let idx_dynamic: i32 = -1;
|
|
let idx_versym: i32 = -1;
|
|
let idx_verdef: i32 = -1;
|
|
let i: u32 = 0u32;
|
|
for (i < shnum) {
|
|
let sh_p: u64 = shoff + (i: u64) * SH_SIZE;
|
|
let sh_type: u32 = d_u32(buf, sh_p + SH_TYPE);
|
|
if (sh_type == SHT_DYNSYM) { idx_dynsym = i: i32; };
|
|
if (sh_type == SHT_DYNAMIC) { idx_dynamic = i: i32; };
|
|
if (sh_type == SHT_GNU_VERSYM) { idx_versym = i: i32; };
|
|
if (sh_type == SHT_GNU_VERDEF) { idx_verdef = i: i32; };
|
|
i += 1u32;
|
|
};
|
|
if (idx_dynsym < 0) {
|
|
return so_err("no .dynsym");
|
|
};
|
|
|
|
let dynsym_sh: u64 = shoff + (idx_dynsym: u64) * SH_SIZE;
|
|
let dynsym_off: u64 = d_u64(buf, dynsym_sh + SH_OFFSET);
|
|
let dynsym_size: u64 = d_u64(buf, dynsym_sh + SH_SIZE_F);
|
|
let dynsym_link: u32 = d_u32(buf, dynsym_sh + SH_LINK);
|
|
let nsyms: u64 = dynsym_size / SY_SIZE;
|
|
|
|
let dynstr_sh: u64 = shoff + (dynsym_link: u64) * SH_SIZE;
|
|
let dynstr_off: u64 = d_u64(buf, dynstr_sh + SH_OFFSET);
|
|
let dynstr: *u8 = buf + dynstr_off;
|
|
|
|
// SONAME: .dynamic strings live in the section pointed at by its
|
|
// sh_link (almost always .dynstr).
|
|
let soname_cs: *u8 = nil;
|
|
if (idx_dynamic >= 0) {
|
|
let dyn_sh: u64 = shoff + (idx_dynamic: u64) * SH_SIZE;
|
|
let dyn_off: u64 = d_u64(buf, dyn_sh + SH_OFFSET);
|
|
let dyn_size: u64 = d_u64(buf, dyn_sh + SH_SIZE_F);
|
|
let dyn_link: u32 = d_u32(buf, dyn_sh + SH_LINK);
|
|
let dstr_sh: u64 = shoff + (dyn_link: u64) * SH_SIZE;
|
|
let dstr_off: u64 = d_u64(buf, dstr_sh + SH_OFFSET);
|
|
let dstr: *u8 = buf + dstr_off;
|
|
let nd: u64 = dyn_size / DY_SIZE;
|
|
let di: u64 = 0u64;
|
|
for (di < nd) {
|
|
let d_p: u64 = dyn_off + di * DY_SIZE;
|
|
let d_tag: i64 = d_i64(buf, d_p + DY_TAG);
|
|
if (d_tag == DT_NULL_TAG) {
|
|
di = nd; // break
|
|
} else {
|
|
if (d_tag == DT_SONAME_TAG) {
|
|
let d_val: u64 = d_u64(buf, d_p + DY_VAL);
|
|
soname_cs = dstr + d_val;
|
|
di = nd; // break
|
|
} else {
|
|
di += 1u64;
|
|
};
|
|
};
|
|
};
|
|
};
|
|
if (soname_cs == nil) {
|
|
soname_cs = d_basename(path_cs);
|
|
};
|
|
|
|
// Versym is one u16 per dynsym entry.
|
|
let versym_off: u64 = 0u64;
|
|
let has_versym: i32 = 0;
|
|
if (idx_versym >= 0) {
|
|
let vs_sh: u64 = shoff + (idx_versym: u64) * SH_SIZE;
|
|
versym_off = d_u64(buf, vs_sh + SH_OFFSET);
|
|
has_versym = 1;
|
|
};
|
|
|
|
// Verdef section bounds + the .dynstr-like string section it uses.
|
|
let verdef_off: u64 = 0u64;
|
|
let verdef_size: u64 = 0u64;
|
|
let verstr: *u8 = nil;
|
|
if (idx_verdef >= 0) {
|
|
let vd_sh: u64 = shoff + (idx_verdef: u64) * SH_SIZE;
|
|
verdef_off = d_u64(buf, vd_sh + SH_OFFSET);
|
|
verdef_size = d_u64(buf, vd_sh + SH_SIZE_F);
|
|
let vd_link: u32 = d_u32(buf, vd_sh + SH_LINK);
|
|
let vstr_sh: u64 = shoff + (vd_link: u64) * SH_SIZE;
|
|
let vstr_off: u64 = d_u64(buf, vstr_sh + SH_OFFSET);
|
|
verstr = buf + vstr_off;
|
|
};
|
|
|
|
// Build the lso. Exports are appended in dynsym order so
|
|
// l_so_provides_v's first-match semantics match the C version.
|
|
let so: *lso = amalloc(l.a, 64u64): *lso;
|
|
so.path = d_cstr_to_str(l.a, path_cs);
|
|
so.soname = d_cstr_to_str(l.a, soname_cs);
|
|
so.exports = nil;
|
|
let tail: *lexport = nil;
|
|
|
|
let si: u64 = 1u64;
|
|
for (si < nsyms) {
|
|
let s_p: u64 = dynsym_off + si * SY_SIZE;
|
|
let st_shndx: u16 = d_u16(buf, s_p + SY_SHNDX);
|
|
if (st_shndx == 0u16) { si += 1u64; } else {
|
|
let st_info: u8 = buf[s_p + SY_INFO];
|
|
let bind: u32 = (st_info: u32) >> 4u32;
|
|
if (bind != 1u32) { if (bind != 2u32) {
|
|
// not GLOBAL/WEAK
|
|
si += 1u64;
|
|
continue;
|
|
}; };
|
|
let st_name: u32 = d_u32(buf, s_p + SY_NAME);
|
|
let nm_p: *u8 = dynstr + (st_name: u64);
|
|
if (nm_p[0u64] == 0u8) {
|
|
si += 1u64;
|
|
continue;
|
|
};
|
|
|
|
// Determine version. Skip non-default (hidden) and
|
|
// local entries.
|
|
let vername_cs: *u8 = nil;
|
|
let keep: i32 = 1;
|
|
if (has_versym != 0) {
|
|
let v: u16 = d_u16(buf, versym_off + si * 2u64);
|
|
if ((v & VERSYM_HIDDEN_C) != 0u16) {
|
|
keep = 0; // non-default
|
|
} else {
|
|
let vidx: u16 = v & VERSYM_VERSION_C;
|
|
if (vidx == VER_NDX_LOCAL_C) {
|
|
keep = 0; // not exported
|
|
} else { if (vidx == VER_NDX_GLOBAL_C) {
|
|
vername_cs = nil;
|
|
} else { if (vidx == 1u16) {
|
|
// glibc's BASE entry: treat as
|
|
// unversioned. (The C version
|
|
// notes that vidx==1 in Verdef
|
|
// maps to the SONAME BASE.)
|
|
vername_cs = nil;
|
|
} else {
|
|
if (verstr != nil) {
|
|
let nm: *u8 = vd_name_at(buf, verdef_off, verdef_size, verstr, vidx);
|
|
vername_cs = nm;
|
|
};
|
|
}; }; };
|
|
};
|
|
};
|
|
|
|
if (keep != 0) {
|
|
let e: *lexport = amalloc(l.a, 48u64): *lexport;
|
|
e.name = d_cstr_to_str(l.a, nm_p);
|
|
if (vername_cs == nil) {
|
|
e.version.ptr = nil;
|
|
e.version.len = 0i32;
|
|
} else {
|
|
e.version = d_cstr_to_str(l.a, vername_cs);
|
|
};
|
|
e.enext = nil;
|
|
if (tail == nil) {
|
|
so.exports = e;
|
|
} else {
|
|
tail.enext = e;
|
|
};
|
|
tail = e;
|
|
};
|
|
si += 1u64;
|
|
};
|
|
};
|
|
|
|
so.sonext = l.sos;
|
|
l.sos = so;
|
|
return 0;
|
|
};
|
|
|
|
fn so_err(msg: str) i32 = {
|
|
os.write(2, "6l: ".ptr, 4u64);
|
|
os.write(2, msg.ptr, msg.len: u64);
|
|
os.write(2, "\n".ptr, 1u64);
|
|
return -1;
|
|
};
|
|
|
|
// l_so_provides — 1 if so exports name, 0 otherwise.
|
|
export fn l_so_provides(so: *lso, name: str) i32 = {
|
|
if (so == nil) { return 0; };
|
|
let e: *lexport = so.exports;
|
|
for (e != nil) {
|
|
if (s_eq(e.name, name)) { return 1; };
|
|
e = e.enext;
|
|
};
|
|
return 0;
|
|
};
|
|
|
|
// l_so_version — the version of so's export named `name`, or an empty
|
|
// str (ptr=nil, len=0) if the export is unversioned or not present.
|
|
export fn l_so_version(so: *lso, name: str) str = {
|
|
let result: str;
|
|
result.ptr = nil;
|
|
result.len = 0i32;
|
|
if (so == nil) { return result; };
|
|
let e: *lexport = so.exports;
|
|
for (e != nil) {
|
|
if (s_eq(e.name, name)) {
|
|
result.ptr = e.version.ptr;
|
|
result.len = e.version.len;
|
|
return result;
|
|
};
|
|
e = e.enext;
|
|
};
|
|
return result;
|
|
};
|
|
|
|
fn s_eq(a: str, b: str) bool = {
|
|
if (a.len != b.len) { return false; };
|
|
let i: i32 = 0;
|
|
for (i < a.len) {
|
|
if (a[i] != b[i]) { return false; };
|
|
i += 1;
|
|
};
|
|
return true;
|
|
};
|
|
|
|
// selfhost/cmd/6l/pass.ww — port of cmd/6l/pass.c.
|
|
//
|
|
// Resolution + relocation. l_resolve flags every undefined symbol
|
|
// referenced by a relocation, and promotes those provided by some
|
|
// loaded .so to "dynamic" with a freshly-assigned PLT slot.
|
|
// l_relocate walks the rel list and patches the .text bytes in place
|
|
// once the final virtual base is known. Dynamic refs are deferred:
|
|
// their site is patched later in dynout, once the PLT vaddr is known.
|
|
//
|
|
// Supported relocation kinds: PC32 (=2), PLT32 (=4); both are 32-bit
|
|
// PC-relative displacements (PLT32 == PC32 for static).
|
|
|
|
use os;
|
|
use sym;
|
|
use dyn;
|
|
|
|
def R_X86_64_PC32: i32 = 2;
|
|
def R_X86_64_PLT32: i32 = 4;
|
|
|
|
export fn l_resolve(l: *lnk) i32 = {
|
|
// Initialise dynamic-linking sentinels. amalloc zeroes, so
|
|
// is_dyn/dyn_lib start clean — but plt_idx and dynsym_idx
|
|
// must be -1, not 0.
|
|
let si: *lsym = l.syms;
|
|
for (si != nil) {
|
|
si.plt_idx = -1;
|
|
si.dynsym_idx = -1;
|
|
si = si.snext;
|
|
};
|
|
|
|
// Promote each undefined sym that some lso exports to dynamic
|
|
// and hand it a PLT slot. Iteration order over the relocation
|
|
// list determines slot numbering and is stable across runs.
|
|
let r: *lrel = l.rels;
|
|
for (r != nil) {
|
|
if (r.sym != nil) {
|
|
if (r.sym.defined == 0) {
|
|
let sym: *lsym = r.sym;
|
|
if (sym.is_dyn == 0) {
|
|
let so: *lso = l.sos;
|
|
for (so != nil) {
|
|
if (l_so_provides(so, sym.name) != 0) {
|
|
sym.is_dyn = 1;
|
|
sym.dyn_lib = so;
|
|
sym.plt_idx = l.dyn_n;
|
|
l.dyn_n += 1;
|
|
so = nil; // break
|
|
} else {
|
|
so = so.sonext;
|
|
};
|
|
};
|
|
};
|
|
};
|
|
};
|
|
r = r.rnext;
|
|
};
|
|
|
|
// What remains undefined truly is undefined.
|
|
let r2: *lrel = l.rels;
|
|
for (r2 != nil) {
|
|
if (r2.sym != nil) {
|
|
if (r2.sym.defined == 0) {
|
|
if (r2.sym.is_dyn == 0) {
|
|
os.write(2, "6l: undefined reference to '".ptr, 28u64);
|
|
let nm: str = r2.sym.name;
|
|
os.write(2, nm.ptr, nm.len: u64);
|
|
os.write(2, "'\n".ptr, 2u64);
|
|
l.errs += 1;
|
|
};
|
|
};
|
|
};
|
|
r2 = r2.rnext;
|
|
};
|
|
return l.errs;
|
|
};
|
|
|
|
fn patch_u32(p: *u8, v: u32) void = {
|
|
p[0] = (v & 255u32): u8;
|
|
p[1] = ((v >> 8u32) & 255u32): u8;
|
|
p[2] = ((v >> 16u32) & 255u32): u8;
|
|
p[3] = ((v >> 24u32) & 255u32): u8;
|
|
};
|
|
|
|
export fn l_relocate(l: *lnk, base: u64) i32 = {
|
|
let r: *lrel = l.rels;
|
|
for (r != nil) {
|
|
if (r.sym != nil) {
|
|
// Dynamic refs are patched later in dynout once the
|
|
// PLT vaddr is known.
|
|
if (r.sym.is_dyn != 0) {
|
|
r = r.rnext;
|
|
continue;
|
|
};
|
|
if (r.sym.defined != 0) {
|
|
let k: i32 = r.kind;
|
|
if (k == R_X86_64_PC32) {
|
|
let site: u64 = base + r.off;
|
|
let target: i64 = (base + r.sym.val): i64;
|
|
let rel: i64 = (target - site: i64) + r.addend;
|
|
patch_u32(l.text + r.off, rel: u32);
|
|
} else { if (k == R_X86_64_PLT32) {
|
|
let site: u64 = base + r.off;
|
|
let target: i64 = (base + r.sym.val): i64;
|
|
let rel: i64 = (target - site: i64) + r.addend;
|
|
patch_u32(l.text + r.off, rel: u32);
|
|
} else {
|
|
os.write(2, "6l: unsupported reloc kind\n".ptr, 27u64);
|
|
l.errs += 1;
|
|
};};
|
|
};
|
|
};
|
|
r = r.rnext;
|
|
};
|
|
return l.errs;
|
|
};
|
|
|
|
// selfhost/cmd/6l/dynout.ww — port of cmd/6l/dynout.c.
|
|
//
|
|
// Emit a dynamic-linked ELF executable. The shape is the simplest
|
|
// valid one: PT_INTERP + PT_DYNAMIC + DT_BIND_NOW so the loader
|
|
// resolves every PLT slot at startup (no lazy binding, no PLT0
|
|
// trampoline). SysV .hash, not .gnu.hash. Non-PIE, fixed base.
|
|
//
|
|
// Layout:
|
|
// [0] Ehdr
|
|
// [64] Phdrs (PT_LOAD R+X, PT_LOAD R+W, PT_INTERP, PT_DYNAMIC)
|
|
// [interp_off] "/lib64/ld-linux-x86-64.so.2\0"
|
|
// [dynstr_off] .dynstr
|
|
// [dynsym_off] .dynsym
|
|
// [hash_off] .hash
|
|
// [versym_off] .gnu.version
|
|
// [verneed_off] .gnu.version_r
|
|
// [relaplt_off] .rela.plt
|
|
// [pad to 0x1000]
|
|
// [text_off] .text
|
|
// [plt_off] .plt
|
|
// [pad to next page]
|
|
// [gotplt_off] .got.plt (writable; mapped by PT_LOAD #2)
|
|
// [dynamic_off] .dynamic (writable; covered by PT_DYNAMIC)
|
|
//
|
|
// cgen workaround notes:
|
|
// - Two-level field assignments through pointers (e.g. r.sym.is_dyn = 1)
|
|
// silently fail in the current wwstage cgen. We bind the inner
|
|
// pointer to a local first: `let sym = r.sym; sym.is_dyn = 1;`
|
|
// - Tuple returns of (i32, str) drop the str payload. l_so_version
|
|
// returns a plain str instead.
|
|
// - `def NAME: str = "...";` produces a bogus str (len ends up adding
|
|
// to an offset accumulator). We use a fn returning the literal.
|
|
|
|
use os;
|
|
use mem;
|
|
use sym;
|
|
|
|
// ELF constants
|
|
def ET_EXEC_D: u16 = 2u16;
|
|
def EM_X86_64_D: u16 = 62u16;
|
|
def EV_CURRENT_D: u32 = 1u32;
|
|
def ELFCLASS64_D: u8 = 2u8;
|
|
def ELFDATA2LSB_D: u8 = 1u8;
|
|
|
|
def PT_LOAD_D: u32 = 1u32;
|
|
def PT_DYNAMIC_D: u32 = 2u32;
|
|
def PT_INTERP_D: u32 = 3u32;
|
|
def PF_X_D: u32 = 1u32;
|
|
def PF_W_D: u32 = 2u32;
|
|
def PF_R_D: u32 = 4u32;
|
|
|
|
def DT_NULL: i64 = 0i64;
|
|
def DT_NEEDED: i64 = 1i64;
|
|
def DT_PLTRELSZ: i64 = 2i64;
|
|
def DT_PLTGOT: i64 = 3i64;
|
|
def DT_HASH: i64 = 4i64;
|
|
def DT_STRTAB: i64 = 5i64;
|
|
def DT_SYMTAB: i64 = 6i64;
|
|
def DT_STRSZ: i64 = 10i64;
|
|
def DT_SYMENT: i64 = 11i64;
|
|
def DT_PLTREL: i64 = 20i64;
|
|
def DT_RELA: i64 = 7i64;
|
|
def DT_JMPREL: i64 = 23i64;
|
|
def DT_BIND_NOW: i64 = 24i64;
|
|
def DT_VERSYM: i64 = 1879048176i64; // 0x6ffffff0
|
|
def DT_VERNEED: i64 = 1879048190i64; // 0x6ffffffe
|
|
def DT_VERNEEDNUM: i64 = 1879048191i64; // 0x6fffffff
|
|
|
|
def VER_NDX_LOCAL_D: u16 = 0u16;
|
|
def VER_NDX_GLOBAL_D: u16 = 1u16;
|
|
|
|
def R_X86_64_PC32_D: i32 = 2;
|
|
def R_X86_64_PLT32_D: i32 = 4;
|
|
def R_X86_64_JUMP_SLOT_D: u32 = 7u32;
|
|
|
|
def STB_GLOBAL_D: u8 = 1u8;
|
|
def STT_FUNC_D: u8 = 2u8;
|
|
|
|
def PLT_STUB_BYTES_D: u64 = 8u64;
|
|
def PAGE: u64 = 4096u64;
|
|
|
|
// The PT_INTERP literal. Returned via a fn to dodge `def : str = "..."`
|
|
// breakage in the current cgen.
|
|
fn interp_str_v() str = {
|
|
return "/lib64/ld-linux-x86-64.so.2";
|
|
};
|
|
|
|
// ---- byte writers ------------------------------------------------------
|
|
|
|
fn d_wr8(buf: *u8, off: u64, v: u8) void = {
|
|
buf[off] = v;
|
|
};
|
|
|
|
fn d_wr16(buf: *u8, off: u64, v: u16) void = {
|
|
buf[off] = (v & 255u16): u8;
|
|
buf[off + 1u64] = ((v >> 8u16) & 255u16): u8;
|
|
};
|
|
|
|
fn d_wr32(buf: *u8, off: u64, v: u32) void = {
|
|
buf[off] = (v & 255u32): u8;
|
|
buf[off + 1u64] = ((v >> 8u32) & 255u32): u8;
|
|
buf[off + 2u64] = ((v >> 16u32) & 255u32): u8;
|
|
buf[off + 3u64] = ((v >> 24u32) & 255u32): u8;
|
|
};
|
|
|
|
fn d_wr64(buf: *u8, off: u64, v: u64) void = {
|
|
d_wr32(buf, off, (v & 4294967295u64): u32);
|
|
d_wr32(buf, off + 4u64, ((v >> 32u64) & 4294967295u64): u32);
|
|
};
|
|
|
|
fn d_wri64(buf: *u8, off: u64, v: i64) void = {
|
|
d_wr64(buf, off, v: u64);
|
|
};
|
|
|
|
fn d_wri32(buf: *u8, off: u64, v: i32) void = {
|
|
d_wr32(buf, off, v: u32);
|
|
};
|
|
|
|
// ---- byte readers ------------------------------------------------------
|
|
|
|
fn d_rd_u16(p: *u8, off: u64) u16 = {
|
|
let b0: u16 = p[off]: u16;
|
|
let b1: u16 = p[off + 1u64]: u16;
|
|
return b0 | (b1 << 8u16);
|
|
};
|
|
|
|
fn d_rd_u32(p: *u8, off: u64) u32 = {
|
|
let b0: u32 = p[off]: u32;
|
|
let b1: u32 = p[off + 1u64]: u32;
|
|
let b2: u32 = p[off + 2u64]: u32;
|
|
let b3: u32 = p[off + 3u64]: u32;
|
|
return b0 | (b1 << 8u32) | (b2 << 16u32) | (b3 << 24u32);
|
|
};
|
|
|
|
fn d_rd_i32(p: *u8, off: u64) i32 = {
|
|
return d_rd_u32(p, off): i32;
|
|
};
|
|
|
|
fn d_bcopy(dst: *u8, off: u64, src: *u8, n: u64) void = {
|
|
let i: u64 = 0u64;
|
|
for (i < n) {
|
|
dst[off + i] = src[i];
|
|
i += 1u64;
|
|
};
|
|
};
|
|
|
|
// elf_hash — SysV ELF hash. Used for .gnu.version_r's vna_hash.
|
|
fn elf_hash(name: str) u32 = {
|
|
let h: u32 = 0u32;
|
|
let i: i32 = 0;
|
|
for (i < name.len) {
|
|
let c: u32 = (name[i]: u8): u32;
|
|
h = (h << 4u32) + c;
|
|
let g: u32 = h & 4026531840u32; // 0xf0000000
|
|
if (g != 0u32) { h = h ^ (g >> 24u32); };
|
|
h = h & ~g;
|
|
i += 1;
|
|
};
|
|
return h;
|
|
};
|
|
|
|
fn align_up(off: u64, a: u64) u64 = {
|
|
return (off + a - 1u64) & ~(a - 1u64);
|
|
};
|
|
|
|
fn str_eq_d(a: str, b: str) bool = {
|
|
if (a.len != b.len) { return false; };
|
|
let i: i32 = 0;
|
|
for (i < a.len) {
|
|
if (a[i] != b[i]) { return false; };
|
|
i += 1;
|
|
};
|
|
return true;
|
|
};
|
|
|
|
// ---- main entry --------------------------------------------------------
|
|
|
|
export fn l_emit_dyn_elf(l: *lnk, fd: i32, base: u64, entry: u64) i32 = {
|
|
let a: *arena = l.a;
|
|
let n: i32 = l.dyn_n;
|
|
let nu: u64 = n: u64;
|
|
|
|
// ---- collect dyn syms into a plt_idx-indexed array ----
|
|
let dynsyms: **lsym = amalloc(a, nu * 8u64): **lsym;
|
|
let s: *lsym = l.syms;
|
|
for (s != nil) {
|
|
if (s.is_dyn != 0) {
|
|
if (s.plt_idx >= 0) {
|
|
if (s.plt_idx < n) {
|
|
dynsyms[s.plt_idx] = s;
|
|
};
|
|
};
|
|
};
|
|
s = s.snext;
|
|
};
|
|
let i: i32 = 0;
|
|
for (i < n) {
|
|
if (dynsyms[i] == nil) {
|
|
os.write(2, "6l: dynout: no sym for plt_idx\n".ptr, 31u64);
|
|
return 1;
|
|
};
|
|
i += 1;
|
|
};
|
|
|
|
// ---- collect used .so's (in l.sos order) ----
|
|
let max_sos: i32 = 0;
|
|
let so: *lso = l.sos;
|
|
for (so != nil) { max_sos += 1; so = so.sonext; };
|
|
let sos_used: **lso = amalloc(a, (max_sos: u64) * 8u64): **lso;
|
|
let nsos: i32 = 0;
|
|
so = l.sos;
|
|
for (so != nil) {
|
|
let used: i32 = 0;
|
|
let j: i32 = 0;
|
|
for (j < n) {
|
|
let dsm: *lsym = dynsyms[j];
|
|
let dl: *lso = dsm.dyn_lib;
|
|
if (dl == so) { used = 1; j = n; }
|
|
else { j += 1; };
|
|
};
|
|
if (used != 0) {
|
|
sos_used[nsos] = so;
|
|
nsos += 1;
|
|
};
|
|
so = so.sonext;
|
|
};
|
|
|
|
// ---- build flat version table grouped by vlib ----
|
|
// vlib_sos_idx[k] = sos_used index for vlib k.
|
|
// vlib_first[k] = ver index of first version under vlib k.
|
|
// vlib_count[k] = number of versions under vlib k.
|
|
// ver_lib_idx[v] = vlib index that version v belongs to.
|
|
// ver_name_ptr_arr[v] = name's *u8 (interned in the .so's verdef strings).
|
|
// ver_name_len_buf[v] = name length (i32).
|
|
// ver_dynstr_off[v] = offset within .dynstr (assigned after layout).
|
|
// ver_vna_other[v] = versym index (starting at 2).
|
|
|
|
let vlib_sos_idx_buf: *u8 = amalloc(a, (max_sos: u64) * 4u64): *u8;
|
|
let vlib_first_buf: *u8 = amalloc(a, (max_sos: u64) * 4u64): *u8;
|
|
let vlib_count_buf: *u8 = amalloc(a, (max_sos: u64) * 4u64): *u8;
|
|
let n_vlibs: i32 = 0;
|
|
|
|
let ver_lib_idx_buf: *u8 = amalloc(a, nu * 4u64): *u8;
|
|
let ver_name_ptr_arr: **u8 = amalloc(a, nu * 8u64): **u8;
|
|
let ver_name_len_buf: *u8 = amalloc(a, nu * 4u64): *u8;
|
|
let ver_dynstr_off: *u8 = amalloc(a, nu * 4u64): *u8;
|
|
let ver_vna_other: *u8 = amalloc(a, nu * 2u64): *u8;
|
|
let n_vers: i32 = 0;
|
|
|
|
let si: i32 = 0;
|
|
for (si < nsos) {
|
|
let cur_so: *lso = sos_used[si];
|
|
let has: i32 = 0;
|
|
let j: i32 = 0;
|
|
for (j < n) {
|
|
let dsm: *lsym = dynsyms[j];
|
|
let dl: *lso = dsm.dyn_lib;
|
|
if (dl == cur_so) {
|
|
let nm0: str = dsm.name;
|
|
let dv: str = l_so_version(cur_so, nm0);
|
|
if (dv.len > 0) {
|
|
has = 1; j = n;
|
|
} else { j += 1; };
|
|
} else { j += 1; };
|
|
};
|
|
if (has != 0) {
|
|
d_wr32(vlib_sos_idx_buf, (n_vlibs: u64) * 4u64, si: u32);
|
|
d_wr32(vlib_first_buf, (n_vlibs: u64) * 4u64, n_vers: u32);
|
|
let added: i32 = 0;
|
|
let jj: i32 = 0;
|
|
for (jj < n) {
|
|
let dsm2: *lsym = dynsyms[jj];
|
|
let dl2: *lso = dsm2.dyn_lib;
|
|
if (dl2 == cur_so) {
|
|
let nm2: str = dsm2.name;
|
|
let vname: str = l_so_version(cur_so, nm2);
|
|
if (vname.len > 0) {
|
|
let seen: i32 = 0;
|
|
let k: i32 = 0;
|
|
for (k < added) {
|
|
let kk: i32 = n_vers - added + k;
|
|
let existing: str;
|
|
existing.ptr = ver_name_ptr_arr[kk];
|
|
existing.len = d_rd_i32(ver_name_len_buf, (kk: u64) * 4u64);
|
|
if (str_eq_d(existing, vname)) {
|
|
seen = 1; k = added;
|
|
} else { k += 1; };
|
|
};
|
|
if (seen == 0) {
|
|
d_wr32(ver_lib_idx_buf, (n_vers: u64) * 4u64, n_vlibs: u32);
|
|
ver_name_ptr_arr[n_vers] = vname.ptr;
|
|
d_wri32(ver_name_len_buf, (n_vers: u64) * 4u64, vname.len);
|
|
n_vers += 1;
|
|
added += 1;
|
|
};
|
|
};
|
|
};
|
|
jj += 1;
|
|
};
|
|
d_wr32(vlib_count_buf, (n_vlibs: u64) * 4u64, added: u32);
|
|
n_vlibs += 1;
|
|
};
|
|
si += 1;
|
|
};
|
|
|
|
// Assign vna_other indices starting at 2, walking vlib then per-version.
|
|
let next_vna: u16 = 2u16;
|
|
let vi: i32 = 0;
|
|
for (vi < n_vlibs) {
|
|
let first: i32 = d_rd_i32(vlib_first_buf, (vi: u64) * 4u64);
|
|
let cnt: i32 = d_rd_i32(vlib_count_buf, (vi: u64) * 4u64);
|
|
let k: i32 = 0;
|
|
for (k < cnt) {
|
|
d_wr16(ver_vna_other, ((first + k): u64) * 2u64, next_vna);
|
|
next_vna += 1u16;
|
|
k += 1;
|
|
};
|
|
vi += 1;
|
|
};
|
|
|
|
// ---- compute dynstr size ----
|
|
let dynstr_sz: u64 = 1u64; // leading NUL
|
|
let pi: i32 = 0;
|
|
for (pi < nsos) {
|
|
let so4: *lso = sos_used[pi];
|
|
dynstr_sz += so4.soname.len: u64;
|
|
dynstr_sz += 1u64;
|
|
pi += 1;
|
|
};
|
|
pi = 0;
|
|
for (pi < n) {
|
|
let dsm4: *lsym = dynsyms[pi];
|
|
dynstr_sz += dsm4.name.len: u64;
|
|
dynstr_sz += 1u64;
|
|
pi += 1;
|
|
};
|
|
pi = 0;
|
|
for (pi < n_vers) {
|
|
let nm_len: i32 = d_rd_i32(ver_name_len_buf, (pi: u64) * 4u64);
|
|
dynstr_sz += nm_len: u64;
|
|
dynstr_sz += 1u64;
|
|
pi += 1;
|
|
};
|
|
|
|
// ---- fill dynstr ----
|
|
let dynstr: *u8 = amalloc(a, dynstr_sz): *u8;
|
|
let dynstr_pos: u64 = 1u64; // past leading NUL
|
|
|
|
let soname_str: *u8 = amalloc(a, (nsos: u64) * 4u64): *u8;
|
|
pi = 0;
|
|
for (pi < nsos) {
|
|
d_wr32(soname_str, (pi: u64) * 4u64, dynstr_pos: u32);
|
|
let so2: *lso = sos_used[pi];
|
|
let snm: str = so2.soname;
|
|
d_bcopy(dynstr, dynstr_pos, snm.ptr, snm.len: u64);
|
|
dynstr_pos += snm.len: u64;
|
|
dynstr[dynstr_pos] = 0u8;
|
|
dynstr_pos += 1u64;
|
|
pi += 1;
|
|
};
|
|
let symname_str: *u8 = amalloc(a, nu * 4u64): *u8;
|
|
pi = 0;
|
|
for (pi < n) {
|
|
d_wr32(symname_str, (pi: u64) * 4u64, dynstr_pos: u32);
|
|
let dsm: *lsym = dynsyms[pi];
|
|
let snm: str = dsm.name;
|
|
d_bcopy(dynstr, dynstr_pos, snm.ptr, snm.len: u64);
|
|
dynstr_pos += snm.len: u64;
|
|
dynstr[dynstr_pos] = 0u8;
|
|
dynstr_pos += 1u64;
|
|
pi += 1;
|
|
};
|
|
pi = 0;
|
|
for (pi < n_vers) {
|
|
d_wr32(ver_dynstr_off, (pi: u64) * 4u64, dynstr_pos: u32);
|
|
let nm_p: *u8 = ver_name_ptr_arr[pi];
|
|
let nm_len: i32 = d_rd_i32(ver_name_len_buf, (pi: u64) * 4u64);
|
|
d_bcopy(dynstr, dynstr_pos, nm_p, nm_len: u64);
|
|
dynstr_pos += nm_len: u64;
|
|
dynstr[dynstr_pos] = 0u8;
|
|
dynstr_pos += 1u64;
|
|
pi += 1;
|
|
};
|
|
|
|
// ---- per-dyn-sym versym index ----
|
|
let versym_for: *u8 = amalloc(a, nu * 2u64): *u8;
|
|
pi = 0;
|
|
for (pi < n) {
|
|
let dsm3: *lsym = dynsyms[pi];
|
|
let dl3: *lso = dsm3.dyn_lib;
|
|
let nm3: str = dsm3.name;
|
|
let vname: str = l_so_version(dl3, nm3);
|
|
if (vname.len == 0) {
|
|
d_wr16(versym_for, (pi: u64) * 2u64, VER_NDX_GLOBAL_D);
|
|
} else {
|
|
let matched: i32 = 0;
|
|
let vk: i32 = 0;
|
|
for (vk < n_vers) {
|
|
let vlx: i32 = d_rd_i32(ver_lib_idx_buf, (vk: u64) * 4u64);
|
|
let sosx: i32 = d_rd_i32(vlib_sos_idx_buf, (vlx: u64) * 4u64);
|
|
if (sos_used[sosx] == dl3) {
|
|
let exi: str;
|
|
exi.ptr = ver_name_ptr_arr[vk];
|
|
exi.len = d_rd_i32(ver_name_len_buf, (vk: u64) * 4u64);
|
|
if (str_eq_d(exi, vname)) {
|
|
let other: u16 = d_rd_u16(ver_vna_other, (vk: u64) * 2u64);
|
|
d_wr16(versym_for, (pi: u64) * 2u64, other);
|
|
matched = 1;
|
|
vk = n_vers;
|
|
} else { vk += 1; };
|
|
} else { vk += 1; };
|
|
};
|
|
if (matched == 0) {
|
|
d_wr16(versym_for, (pi: u64) * 2u64, VER_NDX_GLOBAL_D);
|
|
};
|
|
};
|
|
pi += 1;
|
|
};
|
|
|
|
// ---- compute byte sizes ----
|
|
let ehdr_sz: u64 = 64u64;
|
|
let n_phdrs: u64 = 4u64;
|
|
let phdr_sz: u64 = n_phdrs * 56u64;
|
|
let is_local: str = interp_str_v();
|
|
let interp_sz: u64 = (is_local.len: u64) + 1u64;
|
|
|
|
let nsyms_total: u64 = 1u64 + nu;
|
|
let dynsym_sz: u64 = nsyms_total * 24u64;
|
|
|
|
let nbuckets: u32 = 1u32;
|
|
let nchain: u32 = nsyms_total: u32;
|
|
let hash_sz: u64 = (2u64 + (nbuckets: u64) + (nchain: u64)) * 4u64;
|
|
|
|
let relaplt_sz: u64 = nu * 24u64;
|
|
let plt_sz: u64 = nu * PLT_STUB_BYTES_D;
|
|
let gotplt_sz: u64 = (3u64 + nu) * 8u64;
|
|
let versym_sz: u64 = nsyms_total * 2u64;
|
|
|
|
let verneed_sz: u64 = 0u64;
|
|
let vli: i32 = 0;
|
|
for (vli < n_vlibs) {
|
|
let cnt: i32 = d_rd_i32(vlib_count_buf, (vli: u64) * 4u64);
|
|
verneed_sz += 16u64 + 16u64 * (cnt: u64);
|
|
vli += 1;
|
|
};
|
|
|
|
let with_ver: i32 = 0;
|
|
if (n_vlibs > 0) { with_ver = 1; };
|
|
let extra: u64 = 0u64;
|
|
if (with_ver != 0) { extra = 3u64; };
|
|
let ndyn: u64 = (nsos: u64) + 11u64 + extra;
|
|
let dynamic_sz: u64 = ndyn * 16u64;
|
|
|
|
// ---- compute file offsets ----
|
|
let off: u64 = ehdr_sz + phdr_sz;
|
|
let interp_off: u64 = off; off += interp_sz;
|
|
off = align_up(off, 8u64);
|
|
let dynstr_off: u64 = off; off += dynstr_sz;
|
|
off = align_up(off, 8u64);
|
|
let dynsym_off: u64 = off; off += dynsym_sz;
|
|
let hash_off: u64 = off; off += hash_sz;
|
|
off = align_up(off, 2u64);
|
|
let versym_off: u64 = off; off += versym_sz;
|
|
off = align_up(off, 4u64);
|
|
let verneed_off: u64 = off; off += verneed_sz;
|
|
off = align_up(off, 8u64);
|
|
let relaplt_off: u64 = off; off += relaplt_sz;
|
|
|
|
let text_off: u64 = align_up(off, PAGE);
|
|
let plt_off: u64 = text_off + l.textlen;
|
|
let rx_end: u64 = plt_off + plt_sz;
|
|
|
|
let gotplt_off: u64 = align_up(rx_end, PAGE);
|
|
let dynamic_off: u64 = gotplt_off + gotplt_sz;
|
|
let file_end: u64 = dynamic_off + dynamic_sz;
|
|
|
|
let interp_va: u64 = base + interp_off;
|
|
let dynstr_va: u64 = base + dynstr_off;
|
|
let dynsym_va: u64 = base + dynsym_off;
|
|
let hash_va: u64 = base + hash_off;
|
|
let versym_va: u64 = base + versym_off;
|
|
let verneed_va: u64 = base + verneed_off;
|
|
let relaplt_va: u64 = base + relaplt_off;
|
|
let text_va: u64 = base + text_off;
|
|
let plt_va: u64 = base + plt_off;
|
|
let gotplt_va: u64 = base + gotplt_off;
|
|
let dynamic_va: u64 = base + dynamic_off;
|
|
|
|
// ---- build .dynsym ----
|
|
let dynsym_buf: *u8 = amalloc(a, dynsym_sz): *u8;
|
|
pi = 0;
|
|
for (pi < n) {
|
|
let eoff: u64 = (1u64 + (pi: u64)) * 24u64;
|
|
d_wr32(dynsym_buf, eoff + 0u64, d_rd_u32(symname_str, (pi: u64) * 4u64));
|
|
d_wr8(dynsym_buf, eoff + 4u64, (STB_GLOBAL_D << 4u8) | (STT_FUNC_D & 15u8));
|
|
d_wr8(dynsym_buf, eoff + 5u64, 0u8);
|
|
d_wr16(dynsym_buf, eoff + 6u64, 0u16);
|
|
d_wr64(dynsym_buf, eoff + 8u64, 0u64);
|
|
d_wr64(dynsym_buf, eoff + 16u64, 0u64);
|
|
pi += 1;
|
|
};
|
|
|
|
// ---- build .hash (SysV, 1 bucket) ----
|
|
let hash_buf: *u8 = amalloc(a, hash_sz): *u8;
|
|
d_wr32(hash_buf, 0u64, nbuckets);
|
|
d_wr32(hash_buf, 4u64, nchain);
|
|
let bucket0: u32 = 0u32;
|
|
if (nsyms_total > 1u64) { bucket0 = 1u32; };
|
|
d_wr32(hash_buf, 8u64, bucket0);
|
|
let ci: u64 = 1u64;
|
|
for (ci < nsyms_total) {
|
|
let nxt: u32 = 0u32;
|
|
if (ci + 1u64 < nsyms_total) { nxt = (ci + 1u64): u32; };
|
|
d_wr32(hash_buf, 8u64 + (nbuckets: u64) * 4u64 + ci * 4u64, nxt);
|
|
ci += 1u64;
|
|
};
|
|
|
|
// ---- build .rela.plt ----
|
|
let relaplt_buf: *u8 = amalloc(a, relaplt_sz): *u8;
|
|
pi = 0;
|
|
for (pi < n) {
|
|
let roff: u64 = (pi: u64) * 24u64;
|
|
d_wr64(relaplt_buf, roff + 0u64, gotplt_va + (3u64 + (pi: u64)) * 8u64);
|
|
let info: u64 = ((1u64 + (pi: u64)) << 32u64) | (R_X86_64_JUMP_SLOT_D: u64);
|
|
d_wr64(relaplt_buf, roff + 8u64, info);
|
|
d_wri64(relaplt_buf, roff + 16u64, 0i64);
|
|
pi += 1;
|
|
};
|
|
|
|
// ---- build .gnu.version (u16 per dynsym entry) ----
|
|
let versym_buf: *u8 = amalloc(a, versym_sz): *u8;
|
|
d_wr16(versym_buf, 0u64, VER_NDX_LOCAL_D);
|
|
pi = 0;
|
|
for (pi < n) {
|
|
d_wr16(versym_buf, 2u64 + (pi: u64) * 2u64, d_rd_u16(versym_for, (pi: u64) * 2u64));
|
|
pi += 1;
|
|
};
|
|
|
|
// ---- build .gnu.version_r ----
|
|
let verneed_buf: *u8 = amalloc(a, verneed_sz): *u8;
|
|
if (verneed_sz > 0u64) {
|
|
let vnoff: u64 = 0u64;
|
|
vli = 0;
|
|
for (vli < n_vlibs) {
|
|
let sos_idx: i32 = d_rd_i32(vlib_sos_idx_buf, (vli: u64) * 4u64);
|
|
let first: i32 = d_rd_i32(vlib_first_buf, (vli: u64) * 4u64);
|
|
let cnt: i32 = d_rd_i32(vlib_count_buf, (vli: u64) * 4u64);
|
|
let vn_start: u64 = vnoff;
|
|
d_wr16(verneed_buf, vnoff + 0u64, 1u16);
|
|
d_wr16(verneed_buf, vnoff + 2u64, cnt: u16);
|
|
d_wr32(verneed_buf, vnoff + 4u64, d_rd_u32(soname_str, (sos_idx: u64) * 4u64));
|
|
d_wr32(verneed_buf, vnoff + 8u64, 16u32);
|
|
vnoff += 16u64;
|
|
let k: i32 = 0;
|
|
for (k < cnt) {
|
|
let vk: i32 = first + k;
|
|
let nm: str;
|
|
nm.ptr = ver_name_ptr_arr[vk];
|
|
nm.len = d_rd_i32(ver_name_len_buf, (vk: u64) * 4u64);
|
|
let h: u32 = elf_hash(nm);
|
|
d_wr32(verneed_buf, vnoff + 0u64, h);
|
|
d_wr16(verneed_buf, vnoff + 4u64, 0u16);
|
|
d_wr16(verneed_buf, vnoff + 6u64, d_rd_u16(ver_vna_other, (vk: u64) * 2u64));
|
|
d_wr32(verneed_buf, vnoff + 8u64, d_rd_u32(ver_dynstr_off, (vk: u64) * 4u64));
|
|
let nxt: u32 = 0u32;
|
|
if (k + 1 < cnt) { nxt = 16u32; };
|
|
d_wr32(verneed_buf, vnoff + 12u64, nxt);
|
|
vnoff += 16u64;
|
|
k += 1;
|
|
};
|
|
let vn_nxt: u32 = 0u32;
|
|
if (vli + 1 < n_vlibs) { vn_nxt = (vnoff - vn_start): u32; };
|
|
d_wr32(verneed_buf, vn_start + 12u64, vn_nxt);
|
|
vli += 1;
|
|
};
|
|
};
|
|
|
|
// ---- build .plt ----
|
|
let plt_buf: *u8 = amalloc(a, plt_sz): *u8;
|
|
pi = 0;
|
|
for (pi < n) {
|
|
let p_off: u64 = (pi: u64) * PLT_STUB_BYTES_D;
|
|
let stub_va: u64 = plt_va + p_off;
|
|
let next_ip: u64 = stub_va + 6u64;
|
|
let slot_va: u64 = gotplt_va + (3u64 + (pi: u64)) * 8u64;
|
|
let disp: i64 = (slot_va: i64) - (next_ip: i64);
|
|
d_wr8(plt_buf, p_off + 0u64, 255u8);
|
|
d_wr8(plt_buf, p_off + 1u64, 37u8);
|
|
d_wr32(plt_buf, p_off + 2u64, (disp: i32): u32);
|
|
pi += 1;
|
|
};
|
|
|
|
// ---- build .got.plt ----
|
|
let gotplt_buf: *u8 = amalloc(a, gotplt_sz): *u8;
|
|
d_wr64(gotplt_buf, 0u64, dynamic_va);
|
|
|
|
// ---- build .dynamic ----
|
|
let dynamic_buf: *u8 = amalloc(a, dynamic_sz): *u8;
|
|
let dk: u64 = 0u64;
|
|
pi = 0;
|
|
for (pi < nsos) {
|
|
d_wri64(dynamic_buf, dk * 16u64 + 0u64, DT_NEEDED);
|
|
d_wr64(dynamic_buf, dk * 16u64 + 8u64, d_rd_u32(soname_str, (pi: u64) * 4u64): u64);
|
|
dk += 1u64;
|
|
pi += 1;
|
|
};
|
|
d_wri64(dynamic_buf, dk * 16u64, DT_HASH); d_wr64(dynamic_buf, dk * 16u64 + 8u64, hash_va); dk += 1u64;
|
|
d_wri64(dynamic_buf, dk * 16u64, DT_STRTAB); d_wr64(dynamic_buf, dk * 16u64 + 8u64, dynstr_va); dk += 1u64;
|
|
d_wri64(dynamic_buf, dk * 16u64, DT_SYMTAB); d_wr64(dynamic_buf, dk * 16u64 + 8u64, dynsym_va); dk += 1u64;
|
|
d_wri64(dynamic_buf, dk * 16u64, DT_STRSZ); d_wr64(dynamic_buf, dk * 16u64 + 8u64, dynstr_sz); dk += 1u64;
|
|
d_wri64(dynamic_buf, dk * 16u64, DT_SYMENT); d_wr64(dynamic_buf, dk * 16u64 + 8u64, 24u64); dk += 1u64;
|
|
d_wri64(dynamic_buf, dk * 16u64, DT_PLTGOT); d_wr64(dynamic_buf, dk * 16u64 + 8u64, gotplt_va); dk += 1u64;
|
|
d_wri64(dynamic_buf, dk * 16u64, DT_PLTRELSZ); d_wr64(dynamic_buf, dk * 16u64 + 8u64, relaplt_sz); dk += 1u64;
|
|
d_wri64(dynamic_buf, dk * 16u64, DT_PLTREL); d_wr64(dynamic_buf, dk * 16u64 + 8u64, DT_RELA: u64);dk += 1u64;
|
|
d_wri64(dynamic_buf, dk * 16u64, DT_JMPREL); d_wr64(dynamic_buf, dk * 16u64 + 8u64, relaplt_va); dk += 1u64;
|
|
d_wri64(dynamic_buf, dk * 16u64, DT_BIND_NOW); d_wr64(dynamic_buf, dk * 16u64 + 8u64, 0u64); dk += 1u64;
|
|
if (with_ver != 0) {
|
|
d_wri64(dynamic_buf, dk * 16u64, DT_VERSYM); d_wr64(dynamic_buf, dk * 16u64 + 8u64, versym_va); dk += 1u64;
|
|
d_wri64(dynamic_buf, dk * 16u64, DT_VERNEED); d_wr64(dynamic_buf, dk * 16u64 + 8u64, verneed_va); dk += 1u64;
|
|
d_wri64(dynamic_buf, dk * 16u64, DT_VERNEEDNUM); d_wr64(dynamic_buf, dk * 16u64 + 8u64, n_vlibs: u64);dk += 1u64;
|
|
};
|
|
d_wri64(dynamic_buf, dk * 16u64, DT_NULL); d_wr64(dynamic_buf, dk * 16u64 + 8u64, 0u64); dk += 1u64;
|
|
if (dk != ndyn) {
|
|
os.write(2, "6l: dynamic entry count mismatch\n".ptr, 33u64);
|
|
return 1;
|
|
};
|
|
|
|
// ---- patch .text relocs targeting dynamic syms ----
|
|
let r: *lrel = l.rels;
|
|
for (r != nil) {
|
|
if (r.sym != nil) {
|
|
let rsym: *lsym = r.sym;
|
|
if (rsym.is_dyn != 0) {
|
|
if (r.kind != R_X86_64_PC32_D) {
|
|
if (r.kind != R_X86_64_PLT32_D) {
|
|
os.write(2, "6l: dynamic reloc kind unsupported\n".ptr, 35u64);
|
|
return 1;
|
|
};
|
|
};
|
|
let site: u64 = text_va + r.off;
|
|
let stub: u64 = plt_va + (rsym.plt_idx: u64) * PLT_STUB_BYTES_D;
|
|
let disp: i64 = (stub: i64) - (site: i64) + r.addend;
|
|
d_wr32(l.text, r.off, (disp: i32): u32);
|
|
};
|
|
};
|
|
r = r.rnext;
|
|
};
|
|
|
|
// ---- assemble file buffer ----
|
|
let file_buf: *u8 = os.alloc(file_end): *u8;
|
|
if (file_buf == nil) {
|
|
os.write(2, "6l: out of memory\n".ptr, 18u64);
|
|
return 1;
|
|
};
|
|
|
|
// Ehdr
|
|
d_wr8(file_buf, 0u64, 127u8);
|
|
d_wr8(file_buf, 1u64, 69u8);
|
|
d_wr8(file_buf, 2u64, 76u8);
|
|
d_wr8(file_buf, 3u64, 70u8);
|
|
d_wr8(file_buf, 4u64, ELFCLASS64_D);
|
|
d_wr8(file_buf, 5u64, ELFDATA2LSB_D);
|
|
d_wr8(file_buf, 6u64, EV_CURRENT_D: u8);
|
|
d_wr16(file_buf, 16u64, ET_EXEC_D);
|
|
d_wr16(file_buf, 18u64, EM_X86_64_D);
|
|
d_wr32(file_buf, 20u64, EV_CURRENT_D);
|
|
d_wr64(file_buf, 24u64, entry);
|
|
d_wr64(file_buf, 32u64, ehdr_sz);
|
|
d_wr64(file_buf, 40u64, 0u64);
|
|
d_wr32(file_buf, 48u64, 0u32);
|
|
d_wr16(file_buf, 52u64, ehdr_sz: u16);
|
|
d_wr16(file_buf, 54u64, 56u16);
|
|
d_wr16(file_buf, 56u64, n_phdrs: u16);
|
|
d_wr16(file_buf, 58u64, 0u16);
|
|
d_wr16(file_buf, 60u64, 0u16);
|
|
d_wr16(file_buf, 62u64, 0u16);
|
|
|
|
// Phdrs at offset 64.
|
|
let p0: u64 = 64u64;
|
|
d_wr32(file_buf, p0 + 0u64, PT_LOAD_D);
|
|
d_wr32(file_buf, p0 + 4u64, PF_R_D | PF_X_D);
|
|
d_wr64(file_buf, p0 + 8u64, 0u64);
|
|
d_wr64(file_buf, p0 + 16u64, base);
|
|
d_wr64(file_buf, p0 + 24u64, base);
|
|
d_wr64(file_buf, p0 + 32u64, rx_end);
|
|
d_wr64(file_buf, p0 + 40u64, rx_end);
|
|
d_wr64(file_buf, p0 + 48u64, PAGE);
|
|
|
|
let p1: u64 = 64u64 + 56u64;
|
|
d_wr32(file_buf, p1 + 0u64, PT_LOAD_D);
|
|
d_wr32(file_buf, p1 + 4u64, PF_R_D | PF_W_D);
|
|
d_wr64(file_buf, p1 + 8u64, gotplt_off);
|
|
d_wr64(file_buf, p1 + 16u64, gotplt_va);
|
|
d_wr64(file_buf, p1 + 24u64, gotplt_va);
|
|
d_wr64(file_buf, p1 + 32u64, file_end - gotplt_off);
|
|
d_wr64(file_buf, p1 + 40u64, file_end - gotplt_off);
|
|
d_wr64(file_buf, p1 + 48u64, PAGE);
|
|
|
|
let p2: u64 = 64u64 + 112u64;
|
|
d_wr32(file_buf, p2 + 0u64, PT_INTERP_D);
|
|
d_wr32(file_buf, p2 + 4u64, PF_R_D);
|
|
d_wr64(file_buf, p2 + 8u64, interp_off);
|
|
d_wr64(file_buf, p2 + 16u64, interp_va);
|
|
d_wr64(file_buf, p2 + 24u64, interp_va);
|
|
d_wr64(file_buf, p2 + 32u64, interp_sz);
|
|
d_wr64(file_buf, p2 + 40u64, interp_sz);
|
|
d_wr64(file_buf, p2 + 48u64, 1u64);
|
|
|
|
let p3: u64 = 64u64 + 168u64;
|
|
d_wr32(file_buf, p3 + 0u64, PT_DYNAMIC_D);
|
|
d_wr32(file_buf, p3 + 4u64, PF_R_D | PF_W_D);
|
|
d_wr64(file_buf, p3 + 8u64, dynamic_off);
|
|
d_wr64(file_buf, p3 + 16u64, dynamic_va);
|
|
d_wr64(file_buf, p3 + 24u64, dynamic_va);
|
|
d_wr64(file_buf, p3 + 32u64, dynamic_sz);
|
|
d_wr64(file_buf, p3 + 40u64, dynamic_sz);
|
|
d_wr64(file_buf, p3 + 48u64, 8u64);
|
|
|
|
// Sections.
|
|
let interp_local: str = interp_str_v();
|
|
d_bcopy(file_buf, interp_off, interp_local.ptr, interp_local.len: u64);
|
|
d_wr8(file_buf, interp_off + (interp_local.len: u64), 0u8);
|
|
d_bcopy(file_buf, dynstr_off, dynstr, dynstr_sz);
|
|
d_bcopy(file_buf, dynsym_off, dynsym_buf, dynsym_sz);
|
|
d_bcopy(file_buf, hash_off, hash_buf, hash_sz);
|
|
d_bcopy(file_buf, versym_off, versym_buf, versym_sz);
|
|
if (verneed_sz > 0u64) {
|
|
d_bcopy(file_buf, verneed_off, verneed_buf, verneed_sz);
|
|
};
|
|
d_bcopy(file_buf, relaplt_off, relaplt_buf, relaplt_sz);
|
|
if (l.textlen > 0u64) {
|
|
d_bcopy(file_buf, text_off, l.text, l.textlen);
|
|
};
|
|
d_bcopy(file_buf, plt_off, plt_buf, plt_sz);
|
|
d_bcopy(file_buf, gotplt_off, gotplt_buf, gotplt_sz);
|
|
d_bcopy(file_buf, dynamic_off, dynamic_buf, dynamic_sz);
|
|
|
|
let wrote: i64 = os.writefull(fd, file_buf, file_end);
|
|
if (wrote != file_end: i64) {
|
|
return 1;
|
|
};
|
|
return 0;
|
|
};
|
|
|
|
// selfhost/cmd/6l/out.ww — port of cmd/6l/out.c.
|
|
//
|
|
// Emit a static ELF64 executable. File layout (per the C original):
|
|
// [0..64) Ehdr
|
|
// [64..120) Phdr (one PT_LOAD)
|
|
// [120..0x1000) zero pad
|
|
// [0x1000..) .text bytes
|
|
// Single PT_LOAD covers the whole file, R+X. No interpreter, no .bss.
|
|
|
|
use os;
|
|
use sym;
|
|
use dynout;
|
|
|
|
def ET_EXEC: u16 = 2u16;
|
|
def EM_X86_64_W: u16 = 62u16;
|
|
def EV_CURRENT: u32 = 1u32;
|
|
def ELFCLASS64: u8 = 2u8;
|
|
def ELFDATA2LSB: u8 = 1u8;
|
|
def PT_LOAD: u32 = 1u32;
|
|
def PF_X: u32 = 1u32;
|
|
def PF_R: u32 = 4u32;
|
|
|
|
def TEXT_OFF: u64 = 4096u64; // 0x1000
|
|
|
|
// ---- little-endian byte writers ----------------------------------------
|
|
|
|
fn wr_u16(buf: *u8, off: u64, v: u16) void = {
|
|
buf[off] = (v & 255u16): u8;
|
|
buf[off + 1u64] = ((v >> 8u16) & 255u16): u8;
|
|
};
|
|
|
|
fn wr_u32(buf: *u8, off: u64, v: u32) void = {
|
|
buf[off] = (v & 255u32): u8;
|
|
buf[off + 1u64] = ((v >> 8u32) & 255u32): u8;
|
|
buf[off + 2u64] = ((v >> 16u32) & 255u32): u8;
|
|
buf[off + 3u64] = ((v >> 24u32) & 255u32): u8;
|
|
};
|
|
|
|
fn wr_u64(buf: *u8, off: u64, v: u64) void = {
|
|
wr_u32(buf, off, (v & 4294967295u64): u32);
|
|
wr_u32(buf, off + 4u64, ((v >> 32u64) & 4294967295u64): u32);
|
|
};
|
|
|
|
// ---- emit ---------------------------------------------------------------
|
|
|
|
export fn l_emit_elf(l: *lnk, fd: i32, base: u64, entry: u64) i32 = {
|
|
// Dispatch: any loaded shared object plus any dynamic ref means
|
|
// we owe the loader a real PT_INTERP/PT_DYNAMIC binary.
|
|
if (l.sos != nil) {
|
|
if (l.dyn_n > 0) {
|
|
return l_emit_dyn_elf(l, fd, base, entry);
|
|
};
|
|
};
|
|
|
|
let filesz: u64 = TEXT_OFF + l.textlen;
|
|
|
|
// One contiguous header buffer covering [0..0x1000), then .text.
|
|
let hdr: *u8 = os.alloc(TEXT_OFF): *u8; // zero-initialised by mmap
|
|
|
|
// --- Ehdr (64 bytes) ---
|
|
hdr[0u64] = 127u8; // 0x7f
|
|
hdr[1u64] = 69u8; // 'E'
|
|
hdr[2u64] = 76u8; // 'L'
|
|
hdr[3u64] = 70u8; // 'F'
|
|
hdr[4u64] = ELFCLASS64;
|
|
hdr[5u64] = ELFDATA2LSB;
|
|
hdr[6u64] = EV_CURRENT: u8;
|
|
wr_u16(hdr, 16u64, ET_EXEC); // e_type
|
|
wr_u16(hdr, 18u64, EM_X86_64_W); // e_machine
|
|
wr_u32(hdr, 20u64, EV_CURRENT); // e_version
|
|
wr_u64(hdr, 24u64, entry); // e_entry
|
|
wr_u64(hdr, 32u64, 64u64); // e_phoff = sizeof(Ehdr)
|
|
wr_u64(hdr, 40u64, 0u64); // e_shoff
|
|
wr_u32(hdr, 48u64, 0u32); // e_flags
|
|
wr_u16(hdr, 52u64, 64u16); // e_ehsize
|
|
wr_u16(hdr, 54u64, 56u16); // e_phentsize
|
|
wr_u16(hdr, 56u64, 1u16); // e_phnum
|
|
wr_u16(hdr, 58u64, 0u16); // e_shentsize
|
|
wr_u16(hdr, 60u64, 0u16); // e_shnum
|
|
wr_u16(hdr, 62u64, 0u16); // e_shstrndx
|
|
|
|
// --- Phdr (56 bytes) at offset 64 ---
|
|
wr_u32(hdr, 64u64, PT_LOAD); // p_type
|
|
wr_u32(hdr, 68u64, PF_R | PF_X); // p_flags
|
|
wr_u64(hdr, 72u64, 0u64); // p_offset
|
|
wr_u64(hdr, 80u64, base); // p_vaddr
|
|
wr_u64(hdr, 88u64, base); // p_paddr
|
|
wr_u64(hdr, 96u64, filesz); // p_filesz
|
|
wr_u64(hdr, 104u64, filesz); // p_memsz
|
|
wr_u64(hdr, 112u64, TEXT_OFF); // p_align
|
|
|
|
// Write [0..0x1000) then .text.
|
|
let n1: i64 = os.writefull(fd, hdr, TEXT_OFF);
|
|
if (n1 != TEXT_OFF: i64) { return -1; };
|
|
if (l.textlen > 0u64) {
|
|
let n2: i64 = os.writefull(fd, l.text, l.textlen);
|
|
if (n2 != l.textlen: i64) { return -1; };
|
|
};
|
|
return 0;
|
|
};
|
|
|
|
// selfhost/cmd/6l/main.ww — port of cmd/6l/main.c.
|
|
//
|
|
// 6l = amd64 linker. Reads relocatable ELF .o files, SysV `ar`
|
|
// archives, and shared objects (ET_DYN). Resolves symbols, applies
|
|
// relocations, writes a static or dynamic-linked ELF executable.
|
|
//
|
|
// 6l_ww -o out [-L<dir>...] [-l<name>...] file1.o file2.o ...
|
|
|
|
use os;
|
|
use mem;
|
|
use sym;
|
|
use obj;
|
|
use dyn;
|
|
use pass;
|
|
use out;
|
|
|
|
def BASE: u64 = 4194304u64; // 0x400000
|
|
def CODE_VA_OFF: u64 = 4096u64; // .text starts at base + 0x1000
|
|
|
|
fn make_lnk(a: *arena) *lnk = {
|
|
let l: *lnk = amalloc(a, 112u64): *lnk;
|
|
l.a = a;
|
|
return l;
|
|
};
|
|
|
|
fn streq_cs(a: *u8, lit: str) bool = {
|
|
let n: u64 = lit.len: u64;
|
|
let i: u64 = 0u64;
|
|
for (i < n) {
|
|
let li: i32 = i: i32;
|
|
if (a[i] != lit[li]) { return false; };
|
|
i += 1u64;
|
|
};
|
|
if (a[i] != 0u8) { return false; };
|
|
return true;
|
|
};
|
|
|
|
fn cstrlen_l(p: *u8) u64 = {
|
|
let n: u64 = 0u64;
|
|
for (p[n] != 0u8) { n += 1u64; };
|
|
return n;
|
|
};
|
|
|
|
// strncmp(a, lit, n): true iff a's first n bytes == lit's first n bytes.
|
|
fn strn_eq(a: *u8, lit: str, n: u64) bool = {
|
|
if ((lit.len: u64) < n) { return false; };
|
|
let i: u64 = 0u64;
|
|
for (i < n) {
|
|
let li: i32 = i: i32;
|
|
if (a[i] != lit[li]) { return false; };
|
|
i += 1u64;
|
|
};
|
|
return true;
|
|
};
|
|
|
|
// Build "<dir>/lib<name>.<ext>" into dst (NUL-terminated). Returns total
|
|
// length excluding NUL. dst must be large enough.
|
|
fn build_path(dst: *u8, dir: *u8, name: *u8, ext: str) u64 = {
|
|
let i: u64 = 0u64;
|
|
let dn: u64 = cstrlen_l(dir);
|
|
let nn: u64 = cstrlen_l(name);
|
|
let k: u64 = 0u64;
|
|
for (k < dn) { dst[i] = dir[k]; i += 1u64; k += 1u64; };
|
|
dst[i] = 47u8; // '/'
|
|
i += 1u64;
|
|
dst[i] = 108u8; // 'l'
|
|
i += 1u64;
|
|
dst[i] = 105u8; // 'i'
|
|
i += 1u64;
|
|
dst[i] = 98u8; // 'b'
|
|
i += 1u64;
|
|
k = 0u64;
|
|
for (k < nn) { dst[i] = name[k]; i += 1u64; k += 1u64; };
|
|
k = 0u64;
|
|
for (k < ext.len: u64) {
|
|
let li: i32 = k: i32;
|
|
dst[i] = ext[li];
|
|
i += 1u64;
|
|
k += 1u64;
|
|
};
|
|
dst[i] = 0u8;
|
|
return i;
|
|
};
|
|
|
|
// Append decimal n to dst at offset i. Returns new offset.
|
|
fn append_dec(dst: *u8, i: u64, n: u64) u64 = {
|
|
if (n == 0u64) {
|
|
dst[i] = 48u8;
|
|
return i + 1u64;
|
|
};
|
|
let buf: *u8 = os.alloc(16u64): *u8;
|
|
let k: u64 = 0u64;
|
|
let v: u64 = n;
|
|
for (v > 0u64) {
|
|
buf[k] = (v % 10u64): u8 + 48u8;
|
|
v = v / 10u64;
|
|
k += 1u64;
|
|
};
|
|
let oi: u64 = i;
|
|
for (k > 0u64) {
|
|
k -= 1u64;
|
|
dst[oi] = buf[k];
|
|
oi += 1u64;
|
|
};
|
|
return oi;
|
|
};
|
|
|
|
fn build_path_v(dst: *u8, dir: *u8, name: *u8, v: u64) u64 = {
|
|
let i: u64 = 0u64;
|
|
let dn: u64 = cstrlen_l(dir);
|
|
let nn: u64 = cstrlen_l(name);
|
|
let k: u64 = 0u64;
|
|
for (k < dn) { dst[i] = dir[k]; i += 1u64; k += 1u64; };
|
|
dst[i] = 47u8; i += 1u64;
|
|
dst[i] = 108u8; i += 1u64;
|
|
dst[i] = 105u8; i += 1u64;
|
|
dst[i] = 98u8; i += 1u64;
|
|
k = 0u64;
|
|
for (k < nn) { dst[i] = name[k]; i += 1u64; k += 1u64; };
|
|
dst[i] = 46u8; i += 1u64; dst[i] = 115u8; i += 1u64; dst[i] = 111u8; i += 1u64; dst[i] = 46u8; i += 1u64;
|
|
i = append_dec(dst, i, v);
|
|
dst[i] = 0u8;
|
|
return i;
|
|
};
|
|
|
|
// is_linkable: read first 8 bytes; require !<arch>\n or \x7fELF.
|
|
fn is_linkable(path: *u8) bool = {
|
|
let fd: i32 = os.open(path, os.O_RDONLY, 0i32);
|
|
if (fd < 0) { return false; };
|
|
let mp: *u8 = os.alloc(8u64): *u8;
|
|
let n: i64 = os.read(fd, mp, 8u64);
|
|
os.close(fd);
|
|
if (n < 4i64) { return false; };
|
|
// archive: "!<arch>\n"
|
|
if (n >= 8i64) {
|
|
if (mp[0u64] == 33u8) { if (mp[1u64] == 60u8) {
|
|
if (mp[2u64] == 97u8) { if (mp[3u64] == 114u8) {
|
|
if (mp[4u64] == 99u8) { if (mp[5u64] == 104u8) {
|
|
if (mp[6u64] == 62u8) { if (mp[7u64] == 10u8) {
|
|
return true;
|
|
}; }; }; }; }; }; }; };
|
|
};
|
|
// ELF: "\x7fELF"
|
|
if (mp[0u64] == 127u8) {
|
|
if (mp[1u64] == 69u8) {
|
|
if (mp[2u64] == 76u8) {
|
|
if (mp[3u64] == 70u8) { return true; };
|
|
};
|
|
};
|
|
};
|
|
return false;
|
|
};
|
|
|
|
// Walk libdirs[0..n) trying lib<name>.so, then lib<name>.so.{0..8},
|
|
// then lib<name>.a. Return arena-owned NUL-terminated path on success,
|
|
// nil on miss.
|
|
fn resolve_lib(a: *arena, name: *u8, libdirs: **u8, n_libdirs: i32) *u8 = {
|
|
let bufp: *u8 = os.alloc(1024u64): *u8;
|
|
let i: i32 = 0;
|
|
for (i < n_libdirs) {
|
|
let dir: *u8 = libdirs[i];
|
|
let _l1: u64 = build_path(bufp, dir, name, ".so");
|
|
if (is_linkable(bufp)) {
|
|
let pl: u64 = cstrlen_l(bufp);
|
|
let p: *u8 = amalloc(a, pl + 1u64): *u8;
|
|
let k: u64 = 0u64;
|
|
for (k <= pl) { p[k] = bufp[k]; k += 1u64; };
|
|
return p;
|
|
};
|
|
let v: u64 = 0u64;
|
|
for (v <= 8u64) {
|
|
let _l2: u64 = build_path_v(bufp, dir, name, v);
|
|
if (is_linkable(bufp)) {
|
|
let pl2: u64 = cstrlen_l(bufp);
|
|
let p2: *u8 = amalloc(a, pl2 + 1u64): *u8;
|
|
let k2: u64 = 0u64;
|
|
for (k2 <= pl2) { p2[k2] = bufp[k2]; k2 += 1u64; };
|
|
return p2;
|
|
};
|
|
v += 1u64;
|
|
};
|
|
let _l3: u64 = build_path(bufp, dir, name, ".a");
|
|
if (is_linkable(bufp)) {
|
|
let pl3: u64 = cstrlen_l(bufp);
|
|
let p3: *u8 = amalloc(a, pl3 + 1u64): *u8;
|
|
let k3: u64 = 0u64;
|
|
for (k3 <= pl3) { p3[k3] = bufp[k3]; k3 += 1u64; };
|
|
return p3;
|
|
};
|
|
i += 1;
|
|
};
|
|
return nil;
|
|
};
|
|
|
|
// Read first 20 bytes; return 1 for ET_DYN .so, 0 for ar/.o.
|
|
fn is_so(path: *u8) i32 = {
|
|
let fd: i32 = os.open(path, os.O_RDONLY, 0i32);
|
|
if (fd < 0) { return 0; };
|
|
let mp: *u8 = os.alloc(20u64): *u8;
|
|
let n: i64 = os.read(fd, mp, 20u64);
|
|
os.close(fd);
|
|
if (n < 20i64) { return 0; };
|
|
if (mp[0u64] != 127u8) { return 0; };
|
|
if (mp[1u64] != 69u8) { return 0; };
|
|
if (mp[2u64] != 76u8) { return 0; };
|
|
if (mp[3u64] != 70u8) { return 0; };
|
|
// e_type at offset 16, u16 little-endian
|
|
let t: u16 = (mp[16u64]: u16) | ((mp[17u64]: u16) << 8u16);
|
|
if (t == 3u16) { return 1; };
|
|
return 0;
|
|
};
|
|
|
|
export fn main(argc: i32, argv: **u8) i32 = {
|
|
let out_path: *u8 = nil;
|
|
let max_inputs: i32 = 64;
|
|
let inputs: **u8 = os.alloc((max_inputs: u64) * 8u64): **u8;
|
|
let ninputs: i32 = 0;
|
|
let libdirs: **u8 = os.alloc((max_inputs: u64) * 8u64): **u8;
|
|
let n_libdirs: i32 = 0;
|
|
let lflags: **u8 = os.alloc((max_inputs: u64) * 8u64): **u8;
|
|
let n_lflags: i32 = 0;
|
|
|
|
let i: i32 = 1;
|
|
for (i < argc) {
|
|
let a: *u8 = argv[i];
|
|
if (streq_cs(a, "-o")) {
|
|
i += 1;
|
|
if (i >= argc) {
|
|
os.write(2, "6l: -o requires argument\n".ptr, 25u64);
|
|
return 2;
|
|
};
|
|
out_path = argv[i];
|
|
} else { if (streq_cs(a, "-L")) {
|
|
i += 1;
|
|
if (i >= argc) {
|
|
os.write(2, "6l: -L requires argument\n".ptr, 25u64);
|
|
return 2;
|
|
};
|
|
libdirs[n_libdirs] = argv[i];
|
|
n_libdirs += 1;
|
|
} else { if (streq_cs(a, "-l")) {
|
|
i += 1;
|
|
if (i >= argc) {
|
|
os.write(2, "6l: -l requires argument\n".ptr, 25u64);
|
|
return 2;
|
|
};
|
|
lflags[n_lflags] = argv[i];
|
|
n_lflags += 1;
|
|
} else { if (a[0u64] == 45u8) {
|
|
// -L<dir> joined form.
|
|
if (a[1u64] == 76u8) {
|
|
if (a[2u64] != 0u8) {
|
|
libdirs[n_libdirs] = a + 2u64;
|
|
n_libdirs += 1;
|
|
} else {
|
|
os.write(2, "6l: bare -L\n".ptr, 12u64);
|
|
return 2;
|
|
};
|
|
} else { if (a[1u64] == 108u8) {
|
|
if (a[2u64] != 0u8) {
|
|
lflags[n_lflags] = a + 2u64;
|
|
n_lflags += 1;
|
|
} else {
|
|
os.write(2, "6l: bare -l\n".ptr, 12u64);
|
|
return 2;
|
|
};
|
|
} else {
|
|
os.write(2, "6l: unknown flag\n".ptr, 17u64);
|
|
return 2;
|
|
};};
|
|
} else {
|
|
if (ninputs >= max_inputs) {
|
|
os.write(2, "6l: too many inputs\n".ptr, 20u64);
|
|
return 2;
|
|
};
|
|
inputs[ninputs] = a;
|
|
ninputs += 1;
|
|
};};};};
|
|
i += 1;
|
|
};
|
|
|
|
if (out_path == nil) {
|
|
os.write(2, "usage: 6l_ww -o exe [-L<dir>...] [-l<name>...] file1.o [file2.o...]\n".ptr, 68u64);
|
|
return 2;
|
|
};
|
|
if (ninputs == 0) {
|
|
os.write(2, "6l: no inputs\n".ptr, 14u64);
|
|
return 2;
|
|
};
|
|
|
|
let a: *arena = newarena();
|
|
let l: *lnk = make_lnk(a);
|
|
|
|
// Seed _start so libwwrt-style start.o is recognised as wanted.
|
|
l_intern(l, "_start");
|
|
|
|
// Load positional inputs first (preserving order).
|
|
let k: i32 = 0;
|
|
for (k < ninputs) {
|
|
if (l_load(l, inputs[k]) != 0) {
|
|
return 1;
|
|
};
|
|
k += 1;
|
|
};
|
|
|
|
// Then resolve -l flags and load each. Archives append; shared
|
|
// objects register their exports.
|
|
let lf: i32 = 0;
|
|
for (lf < n_lflags) {
|
|
let p: *u8 = resolve_lib(a, lflags[lf], libdirs, n_libdirs);
|
|
if (p == nil) {
|
|
os.write(2, "6l: cannot find -l".ptr, 18u64);
|
|
let nm: *u8 = lflags[lf];
|
|
os.write(2, nm, cstrlen_l(nm));
|
|
os.write(2, "\n".ptr, 1u64);
|
|
return 1;
|
|
};
|
|
if (is_so(p) != 0) {
|
|
if (l_load_so(l, p) != 0) { return 1; };
|
|
} else {
|
|
if (l_load(l, p) != 0) { return 1; };
|
|
};
|
|
lf += 1;
|
|
};
|
|
|
|
if (l_resolve(l) != 0) { return 1; };
|
|
if (l_relocate(l, BASE + CODE_VA_OFF) != 0) { return 1; };
|
|
|
|
let entry_sym: *lsym = l_lookup(l, "_start");
|
|
if (entry_sym == nil) { entry_sym = l_lookup(l, "main"); }
|
|
else { if (entry_sym.defined == 0) { entry_sym = l_lookup(l, "main"); }; };
|
|
if (entry_sym == nil) {
|
|
os.write(2, "6l: no _start or main symbol\n".ptr, 29u64);
|
|
return 1;
|
|
};
|
|
if (entry_sym.defined == 0) {
|
|
os.write(2, "6l: no _start or main symbol\n".ptr, 29u64);
|
|
return 1;
|
|
};
|
|
|
|
let flags: i32 = os.O_WRONLY | os.O_CREAT | os.O_TRUNC;
|
|
let fd: i32 = os.open(out_path, flags, 493i32); // 0o755
|
|
if (fd < 0) {
|
|
os.write(2, "6l: cannot open output\n".ptr, 23u64);
|
|
return 1;
|
|
};
|
|
|
|
let entry_va: u64 = BASE + CODE_VA_OFF + entry_sym.val;
|
|
let rc: i32 = l_emit_elf(l, fd, BASE, entry_va);
|
|
os.close(fd);
|
|
return rc;
|
|
};
|
|
|