Hojun-Cho
2c33228b7e
Plan 9-style w-prefix on the per-arch tools, disambiguating from the
real Plan 9 6c/6a/6l in ref/plan9front/:
cmd/wwc/ → cmd/wcc/ libwwc.a → libwcc.a
cmd/6{c,a,l} → cmd/w6{c,a,l} binary names too
test/wwc/ → test/wcc/ 6 test files w/ w6 prefix
selfhost/cmd mirror in lockstep
bootstrap/amd64/{w6c,w6a,w6l} snapshot binaries (gitignored)
WW_6{C,A,L} → WW_W6{C,A,L} env-var overrides
Plan 9 source-tree refs ("Plan 9 6c shape", ref/plan9front/, etc.)
preserved. Hare-style driver, both C and ww sides:
ww test [path] discover *_test.ww in a directory module, run
each; single-file mode for `ww test foo.ww`
Module-by-name `ww build foo` resolves to foo.ww or foo/foo.ww
via search path (cwd : -I dirs : $WW_LIB)
Default-to-cwd `ww build` / `ww test` build the cwd module
Run pass-through `ww run path arg1 arg2` reaches the program
lib/os: getcwd (79) and getdents64 (217) syscalls power `.` resolution
and directory enumeration on the ww side.
Makefile: wwstage tool deps now include lib/os/os.ww (+ lib/strconv
for wwdump_ww) so lib/* edits force their rebuild instead of leaving
stale binaries — surfaced when test 995 first failed against a stale
w6c_ww built before the lib/os additions.
Test 993 byte-identical parity gate (C-side ww vs ww-side ww_ww on a
build corpus) stays green; all 19 tests pass.
116 lines
3.0 KiB
Plaintext
116 lines
3.0 KiB
Plaintext
// selfhost/cmd/w6l/pass.ww — port of cmd/w6l/pass.c.
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//
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// Resolution + relocation. l_resolve flags every undefined symbol
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// referenced by a relocation, and promotes those provided by some
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// loaded .so to "dynamic" with a freshly-assigned PLT slot.
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// l_relocate walks the rel list and patches the .text bytes in place
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// once the final virtual base is known. Dynamic refs are deferred:
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// their site is patched later in dynout, once the PLT vaddr is known.
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//
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// Supported relocation kinds: PC32 (=2), PLT32 (=4); both are 32-bit
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// PC-relative displacements (PLT32 == PC32 for static).
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use os;
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use sym;
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use dyn;
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def R_X86_64_PC32: i32 = 2;
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def R_X86_64_PLT32: i32 = 4;
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export fn l_resolve(l: *lnk) i32 = {
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// Initialise dynamic-linking sentinels. amalloc zeroes, so
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// is_dyn/dyn_lib start clean — but plt_idx and dynsym_idx
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// must be -1, not 0.
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let si: *lsym = l.syms;
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for (si != nil) {
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si.plt_idx = -1;
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si.dynsym_idx = -1;
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si = si.snext;
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};
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// Promote each undefined sym that some lso exports to dynamic
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// and hand it a PLT slot. Iteration order over the relocation
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// list determines slot numbering and is stable across runs.
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let r: *lrel = l.rels;
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for (r != nil) {
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if (r.sym != nil) {
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if (r.sym.defined == 0) {
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let sym: *lsym = r.sym;
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if (sym.is_dyn == 0) {
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let so: *lso = l.sos;
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for (so != nil) {
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if (l_so_provides(so, sym.name) != 0) {
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sym.is_dyn = 1;
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sym.dyn_lib = so;
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sym.plt_idx = l.dyn_n;
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l.dyn_n += 1;
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so = nil; // break
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} else {
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so = so.sonext;
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};
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};
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};
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};
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};
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r = r.rnext;
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};
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// What remains undefined truly is undefined.
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let r2: *lrel = l.rels;
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for (r2 != nil) {
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if (r2.sym != nil) {
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if (r2.sym.defined == 0) {
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if (r2.sym.is_dyn == 0) {
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os.write(2, "w6l: undefined reference to '".ptr, 28u64);
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let nm: str = r2.sym.name;
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os.write(2, nm.ptr, nm.len: u64);
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os.write(2, "'\n".ptr, 2u64);
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l.errs += 1;
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};
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};
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};
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r2 = r2.rnext;
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};
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return l.errs;
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};
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fn patch_u32(p: *u8, v: u32) void = {
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p[0] = (v & 255u32): u8;
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p[1] = ((v >> 8u32) & 255u32): u8;
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p[2] = ((v >> 16u32) & 255u32): u8;
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p[3] = ((v >> 24u32) & 255u32): u8;
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};
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export fn l_relocate(l: *lnk, base: u64) i32 = {
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let r: *lrel = l.rels;
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for (r != nil) {
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if (r.sym != nil) {
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// Dynamic refs are patched later in dynout once the
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// PLT vaddr is known.
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if (r.sym.is_dyn != 0) {
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r = r.rnext;
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continue;
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};
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if (r.sym.defined != 0) {
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let k: i32 = r.kind;
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if (k == R_X86_64_PC32) {
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let site: u64 = base + r.off;
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let target: i64 = (base + r.sym.val): i64;
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let rel: i64 = (target - site: i64) + r.addend;
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patch_u32(l.text + r.off, rel: u32);
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} else { if (k == R_X86_64_PLT32) {
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let site: u64 = base + r.off;
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let target: i64 = (base + r.sym.val): i64;
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let rel: i64 = (target - site: i64) + r.addend;
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patch_u32(l.text + r.off, rel: u32);
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} else {
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os.write(2, "w6l: unsupported reloc kind\n".ptr, 27u64);
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l.errs += 1;
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};};
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};
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};
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r = r.rnext;
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};
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return l.errs;
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};
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