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twn_textures.c: support for .so rodata inference

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veclav talica
2024-09-23 12:50:44 +03:00
parent 0ef8a6233f
commit ce582d8a80
8 changed files with 52 additions and 23 deletions
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35
src/system/linux/twn_elf.c
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@ -1,10 +1,13 @@
#include "elf.h"
#include "twn_elf.h"
#include "twn_game_object_c.h"
#include <fcntl.h>
#include <unistd.h>
#include <sys/auxv.h>
#include <elf.h>
#include <linux/limits.h>
#define __USE_GNU
#include <dlfcn.h>
#include <stdbool.h>
#include <stdio.h>
@ -17,10 +20,21 @@ bool infer_elf_section_bounds(const char *const restrict name,
{
bool result = false;
char buf[PATH_MAX];
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 */
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;
memcpy(buf, "libgame.so", sizeof "libgame.so");
}
int elf = open(buf, O_RDONLY);
if (elf == -1)
@ -51,8 +65,15 @@ bool infer_elf_section_bounds(const char *const restrict name,
if (strcmp(&sh[shdr.sh_name], name) == 0) {
result = true;
*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;
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;
}
}