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.
95 lines
2.1 KiB
C
95 lines
2.1 KiB
C
/*
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* out.c — emit a static ELF64 executable.
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*
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* Layout (file order):
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* [0..64) ELF header
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* [64..120) program header (one PT_LOAD)
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* [120..0x1000) zero pad
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* [0x1000..) .text bytes
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*
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* The single PT_LOAD covers the whole file, R+X. No interpreter,
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* no dynamic, no .bss yet. Entry point is the address of the
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* symbol named "_start" (or whatever main supplies via -e).
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*/
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#include "l.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#define ET_EXEC 2
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#define EM_X86_64 62
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#define EV_CURRENT 1
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#define ELFCLASS64 2
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#define ELFDATA2LSB 1
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#define PT_LOAD 1
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#define PF_X 1
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#define PF_W 2
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#define PF_R 4
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#pragma pack(push, 1)
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typedef struct {
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u8 e_ident[16];
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u16 e_type, e_machine;
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u32 e_version;
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u64 e_entry, e_phoff, e_shoff;
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u32 e_flags;
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u16 e_ehsize, e_phentsize, e_phnum, e_shentsize, e_shnum, e_shstrndx;
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} Ehdr;
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typedef struct {
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u32 p_type, p_flags;
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u64 p_offset, p_vaddr, p_paddr;
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u64 p_filesz, p_memsz, p_align;
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} Phdr;
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#pragma pack(pop)
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int
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l_emit_elf(Lnk *l, FILE *f, u64 base, u64 entry)
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{
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/* Dispatch: any loaded shared object plus any dynamic ref means
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* we owe the loader a real PT_INTERP/PT_DYNAMIC binary. */
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if (l->sos != NULL && l->dyn_n > 0)
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return l_emit_dyn_elf(l, f, base, entry);
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const u64 text_off = 0x1000;
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const u64 text_va = base + text_off;
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const u64 filesz = text_off + l->textlen;
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Ehdr eh = {0};
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memcpy(eh.e_ident, "\x7f""ELF", 4);
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eh.e_ident[4] = ELFCLASS64;
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eh.e_ident[5] = ELFDATA2LSB;
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eh.e_ident[6] = EV_CURRENT;
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eh.e_type = ET_EXEC;
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eh.e_machine = EM_X86_64;
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eh.e_version = EV_CURRENT;
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eh.e_entry = entry;
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eh.e_phoff = sizeof(Ehdr);
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eh.e_ehsize = sizeof(Ehdr);
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eh.e_phentsize = sizeof(Phdr);
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eh.e_phnum = 1;
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(void)text_va;
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Phdr ph = {0};
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ph.p_type = PT_LOAD;
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ph.p_flags = PF_R | PF_X;
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ph.p_offset = 0;
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ph.p_vaddr = base;
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ph.p_paddr = base;
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ph.p_filesz = filesz;
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ph.p_memsz = filesz;
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ph.p_align = 0x1000;
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fwrite(&eh, 1, sizeof eh, f);
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fwrite(&ph, 1, sizeof ph, f);
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/* pad to text_off */
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long here = ftell(f);
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for (long i = here; i < (long)text_off; i++) fputc(0, f);
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if (l->textlen) fwrite(l->text, 1, l->textlen, f);
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return 0;
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}
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