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Parse symbols to get virtual addresses

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bzt 2020-06-15 20:27:53 +02:00
parent 4aac0746e4
commit 69ae4d7f22
3 changed files with 16 additions and 12 deletions
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bootboot.efi
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bootboot.rom
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28
x86_64-efi/bootboot.c
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@ -60,8 +60,6 @@
#define ELFDATA2LSB 1 /* 2's complement, little endian */
#define PT_LOAD 1 /* Loadable program segment */
#define EM_X86_64 62 /* AMD x86-64 architecture */
#define SHT_SYMTAB 2 /* Symbol table */
#define SHT_STRTAB 3 /* String table */
typedef struct
{
@ -1202,21 +1200,27 @@ LoadCore()
phdr=(Elf64_Phdr *)((UINT8 *)phdr+ehdr->e_phentsize);
}
if(ehdr->e_shoff > 0) {
Elf64_Shdr *shdr=(Elf64_Shdr *)((UINT8 *)ehdr + ehdr->e_shoff);
Elf64_Shdr *shdr=(Elf64_Shdr *)((UINT8 *)ehdr + ehdr->e_shoff), *sym_sh = NULL, *str_sh = NULL;
Elf64_Shdr *strt=(Elf64_Shdr *)((UINT8 *)shdr+(UINT64)ehdr->e_shstrndx*(UINT64)ehdr->e_shentsize);
Elf64_Sym *sym = NULL, *s;
char *strtable = NULL;
char *strtable = (char *)ehdr + strt->sh_offset;
UINT32 strsz = 0, syment = 0;
for(i = 0; i < ehdr->e_shnum; i++){
if(shdr->sh_type == SHT_SYMTAB) { sym=(Elf64_Sym *)((UINT8*)ehdr+shdr->sh_offset); syment=shdr->sh_entsize; }
if(shdr->sh_type == SHT_STRTAB) { strtable = (char *)ehdr + shdr->sh_offset; strsz = shdr->sh_size; }
/* checking shdr->sh_type is not enough, there can be multiple SHT_STRTAB records... */
if(!CompareMem(strtable + shdr->sh_name, ".symtab", 8)) sym_sh = shdr;
if(!CompareMem(strtable + shdr->sh_name, ".strtab", 8)) str_sh = shdr;
shdr = (Elf64_Shdr *)((UINT8 *)shdr + ehdr->e_shentsize);
}
if(strtable && strsz > 0 && sym && syment > 0)
for(s = sym, i = 0; i<(strtable-(char*)sym)/syment && s->st_name < strsz; i++, s++) {
if(!CompareMem(strtable + s->st_name, "bootboot", 9)) bb_addr = s->st_value;
if(!CompareMem(strtable + s->st_name, "environment", 12)) env_addr = s->st_value;
if(!CompareMem(strtable + s->st_name, "fb", 3)) fb_addr = s->st_value;
}
if(str_sh && sym_sh) {
strtable = (char *)ehdr + str_sh->sh_offset; strsz = str_sh->sh_size;
sym = (Elf64_Sym *)((UINT8*)ehdr + sym_sh->sh_offset); syment = sym_sh->sh_entsize;
if(str_sh->sh_offset && strsz > 0 && sym_sh->sh_offset && syment > 0)
for(s = sym, i = 0; i<(strtable-(char*)sym)/syment && s->st_name < strsz; i++, s++) {
if(!CompareMem(strtable + s->st_name, "bootboot", 9)) bb_addr = s->st_value;
if(!CompareMem(strtable + s->st_name, "environment", 12)) env_addr = s->st_value;
if(!CompareMem(strtable + s->st_name, "fb", 3)) fb_addr = s->st_value;
}
}
}
} else if(((mz_hdr*)(core.ptr))->magic==MZ_MAGIC && ((mz_hdr*)(core.ptr))->peaddr<65536 && pehdr->magic == PE_MAGIC &&
pehdr->machine == IMAGE_FILE_MACHINE_AMD64 && pehdr->file_type == PE_OPT_MAGIC_PE32PLUS &&