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Make fixupobj work on Windows

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This fixes a regression with recent cosmocc toolchain releases that
causes fixupobj to fail with "ifunc ftruncate #1 failed" on Windows
This commit is contained in:
Justine Tunney 2024-03-24 03:14:25 -07:00
parent 9a10adac35
commit 045632a743
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GPG key ID: BE714B4575D6E328
7 changed files with 38 additions and 15 deletions
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36
tool/build/fixupobj.c
View file

@ -33,6 +33,7 @@
#include "libc/log/log.h"
#include "libc/macros.internal.h"
#include "libc/mem/gc.h"
#include "libc/mem/mem.h"
#include "libc/runtime/runtime.h"
#include "libc/serialize.h"
#include "libc/stdalign.internal.h"
@ -71,6 +72,21 @@ static wontreturn void Die(const char *reason) {
exit(1);
}
static wontreturn void DieOom(void) {
Die("out of memory");
}
static void *Malloc(size_t n) {
void *p;
if (!(p = malloc(n))) DieOom();
return p;
}
static void *Realloc(void *p, size_t n) {
if (!(p = realloc(p, n))) DieOom();
return p;
}
static wontreturn void SysExit(const char *func) {
const char *errstr;
if (!(errstr = _strerdoc(errno))) errstr = "EUNKNOWN";
@ -515,10 +531,7 @@ static void GenerateIfuncInit(void) {
// remap file so it has more space
if (elf->e_shnum + 2 > 65535) Die("too many sections");
size_t reserve_size = esize + 32 * 1024 * 1024;
if (ftruncate(fildes, reserve_size)) SysExit("ifunc ftruncate #1");
elf = mmap((char *)elf, reserve_size, PROT_READ | PROT_WRITE,
MAP_FIXED | MAP_SHARED, fildes, 0);
if (elf == MAP_FAILED) SysExit("ifunc mmap");
elf = Realloc(elf, reserve_size);
// duplicate section name strings table to end of file
Elf64_Shdr *shdrstr_shdr = (Elf64_Shdr *)((char *)elf + elf->e_shoff +
@ -591,8 +604,6 @@ static void GenerateIfuncInit(void) {
memcpy((char *)elf + esize, code, code_i);
esize += code_i;
unassert(esize == code_shdr->sh_offset + code_shdr->sh_size);
if (ftruncate(fildes, esize)) SysExit("ifunc ftruncate #1");
}
// when __attribute__((__target_clones__(...))) is used, static binaries
@ -622,9 +633,9 @@ static void FixupObject(void) {
SysExit("lseek");
}
if (esize) {
if ((elf = mmap((void *)0x032100000000, esize, PROT_READ | PROT_WRITE,
MAP_FIXED | MAP_SHARED, fildes, 0)) == MAP_FAILED) {
SysExit("mmap");
elf = Malloc(esize);
if (pread(fildes, elf, esize, 0) != esize) {
SysExit("pread");
}
if (!IsElf64Binary(elf, esize)) {
Die("not an elf64 binary");
@ -654,13 +665,10 @@ static void FixupObject(void) {
PurgeIfuncSections();
RelinkZipFiles();
}
if (msync(elf, esize, MS_ASYNC | MS_INVALIDATE)) {
SysExit("msync");
if (pwrite(fildes, elf, esize, 0) != esize) {
SysExit("pwrite");
}
}
if (munmap(elf, esize)) {
SysExit("munmap");
}
}
if (close(fildes)) {
SysExit("close");