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remove twn_elf

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veclavtalica 2025-01-29 01:24:10 +03:00
parent 732b61e207
commit fedf1b5ef3
3 changed files with 0 additions and 104 deletions
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1
CMakeLists.txt
View File

@ -67,7 +67,6 @@ add_subdirectory(third-party/libxm ${CMAKE_CURRENT_BINARY_DIR}/third-party/libxm
if(LINUX)
set(SYSTEM_SOURCE_FILES
src/system/linux/twn_elf.c
src/system/linux/twn_timer.c
$<$<BOOL:${TWN_FEATURE_DYNLIB_GAME}>:src/game_object/twn_linux_game_object.c>)
elseif(WIN32)

93
src/system/linux/twn_elf.c
View File

@ -1,93 +0,0 @@
#include "twn_elf.h"
#include "twn_game_object_c.h"
#include "twn_engine_context_c.h"
#include <fcntl.h>
#include <unistd.h>
#include <sys/auxv.h>
#include <elf.h>
#include <linux/limits.h>
#include <dlfcn.h>
#include <SDL2/SDL.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
bool infer_elf_section_bounds(const char *const restrict name,
const char **restrict vm_start,
const char **restrict vm_end)
{
bool result = false;
char buf[PATH_MAX];
bool from_shared_object;
Dl_info info;
if (!dladdr(game_object_get_game_tick_address(), &info)) {
/* statically linked */
from_shared_object = false;
ssize_t l = readlink("/proc/self/exe", buf, PATH_MAX);
if (l == -1)
goto ERR_CANT_READLINK;
buf[l] = 0; /* readlink() doesn't write a terminator */
} else {
/* dynamically linked */
from_shared_object = true;
if (SDL_snprintf(buf, sizeof buf, "%s%s", ctx.base_dir, "libgame.so") < 0)
goto ERR_CANT_APPEND_BASE_PATH;
}
int elf = open(buf, O_RDONLY);
if (elf == -1)
goto ERR_CANT_OPEN_SELF;
/* elf header */
Elf64_Ehdr ehdr;
read(elf, &ehdr, sizeof ehdr);
if (ehdr.e_ident[EI_MAG0] != ELFMAG0 ||
ehdr.e_ident[EI_MAG1] != ELFMAG1 ||
ehdr.e_ident[EI_MAG2] != ELFMAG2 ||
ehdr.e_ident[EI_MAG3] != ELFMAG3)
goto ERR_NOT_ELF;
/* section header string table */
Elf64_Shdr shstrdr;
lseek(elf, ehdr.e_shoff + ehdr.e_shstrndx * sizeof (Elf64_Shdr), SEEK_SET);
read(elf, &shstrdr, sizeof shstrdr);
char *sh = malloc(shstrdr.sh_size);
lseek(elf, shstrdr.sh_offset, SEEK_SET);
read(elf, sh, shstrdr.sh_size);
/* walk sections searching for needed name */
lseek(elf, ehdr.e_shoff, SEEK_SET);
for (size_t s = 0; s < ehdr.e_shnum; ++s) {
Elf64_Shdr shdr;
read(elf, &shdr, sizeof shdr);
if (strcmp(&sh[shdr.sh_name], name) == 0) {
result = true;
if (!from_shared_object) {
*vm_start = getauxval(AT_ENTRY) - ehdr.e_entry + (char *)shdr.sh_addr;
*vm_end = getauxval(AT_ENTRY) - ehdr.e_entry + (char *)shdr.sh_addr + shdr.sh_size;
} else {
*vm_start = (uintptr_t)info.dli_fbase + (char *)shdr.sh_addr;
*vm_end = (uintptr_t)info.dli_fbase + (char *)shdr.sh_addr + shdr.sh_size;
}
break;
}
}
free(sh);
ERR_NOT_ELF:
close(elf);
ERR_CANT_OPEN_SELF:
ERR_CANT_APPEND_BASE_PATH:
ERR_CANT_READLINK:
return result;
}

10
src/system/linux/twn_elf.h
View File

@ -1,10 +0,0 @@
#ifndef TWN_ELF_H
#define TWN_ELF_H
#include <stdbool.h>
bool infer_elf_section_bounds(const char *restrict name,
const char **restrict vm_start,
const char **restrict vm_end);
#endif