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- Add GetCpuCount() API to redbean
- Add unix.gmtime() API to redbean
- Add unix.readlink() API to redbean
- Add unix.localtime() API to redbean
- Perfect the new redbean UNIX module APIs
- Integrate with Linux clock_gettime() vDSO
- Run Lua garbage collector when malloc() fails
- Fix another regression quirk with linenoise repl
- Fix GetProgramExecutableName() for systemwide installs
- Fix a build flake with test/libc/mem/test.mk SRCS list
This commit is contained in:
Justine Tunney 2022-04-25 21:16:05 -07:00
parent 860ea18a87
commit d57b81aac7
51 changed files with 3096 additions and 1395 deletions
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94
libc/calls/vdsofunc.greg.c Normal file
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2022 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/bits/bits.h"
#include "libc/calls/calls.h"
#include "libc/calls/internal.h"
#include "libc/elf/scalar.h"
#include "libc/elf/struct/ehdr.h"
#include "libc/elf/struct/shdr.h"
#include "libc/elf/struct/sym.h"
#include "libc/log/libfatal.internal.h"
#include "libc/runtime/runtime.h"
#include "libc/sysv/consts/auxv.h"
#define LAZY_RHEL7_RELOCATION 0xfffff
#define GetStr(tab, rva) ((char *)(tab) + (rva))
#define GetSection(e, s) ((void *)((intptr_t)(e) + (size_t)(s)->sh_offset))
#define GetShstrtab(e) GetSection(e, GetShdr(e, (e)->e_shstrndx))
#define GetSectionName(e, s) GetStr(GetShstrtab(e), (s)->sh_name)
#define GetPhdr(e, i) \
((Elf64_Phdr *)((intptr_t)(e) + (e)->e_phoff + \
(size_t)(e)->e_phentsize * (i)))
#define GetShdr(e, i) \
((Elf64_Shdr *)((intptr_t)(e) + (e)->e_shoff + \
(size_t)(e)->e_shentsize * (i)))
static char *GetDynamicStringTable(Elf64_Ehdr *e, size_t *n) {
char *name;
Elf64_Half i;
Elf64_Shdr *shdr;
for (i = 0; i < e->e_shnum; ++i) {
shdr = GetShdr(e, i);
name = GetSectionName(e, GetShdr(e, i));
if (shdr->sh_type == SHT_STRTAB) {
name = GetSectionName(e, GetShdr(e, i));
if (name && READ64LE(name) == READ64LE(".dynstr")) {
if (n) *n = shdr->sh_size;
return GetSection(e, shdr);
}
}
}
return 0;
}
static Elf64_Sym *GetDynamicSymbolTable(Elf64_Ehdr *e, Elf64_Xword *n) {
Elf64_Half i;
Elf64_Shdr *shdr;
for (i = e->e_shnum; i > 0; --i) {
shdr = GetShdr(e, i - 1);
if (shdr->sh_type == SHT_DYNSYM) {
if (shdr->sh_entsize != sizeof(Elf64_Sym)) continue;
if (n) *n = shdr->sh_size / shdr->sh_entsize;
return GetSection(e, shdr);
}
}
return 0;
}
/**
* Returns Linux Kernel Virtual Dynamic Shared Object function address.
*/
void *__vdsofunc(const char *name) {
size_t m;
char *names;
Elf64_Ehdr *ehdr;
Elf64_Xword i, n;
Elf64_Sym *symtab, *sym;
if ((ehdr = (Elf64_Ehdr *)getauxval(AT_SYSINFO_EHDR)) &&
(names = GetDynamicStringTable(ehdr, &m)) &&
(symtab = GetDynamicSymbolTable(ehdr, &n))) {
for (i = 0; i < n; ++i) {
if (!__strcmp(names + symtab[i].st_name, name)) {
return (char *)ehdr + (symtab[i].st_value & LAZY_RHEL7_RELOCATION);
}
}
}
return 0;
}