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Add function to load elf sections by name

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This commit is contained in:
Matteo Semenzato 2020-03-25 23:22:32 +01:00
parent 8494b1d880
commit ee8e1b330e
2 changed files with 38 additions and 4 deletions
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41
src/lib/elf.c
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@ -13,10 +13,10 @@
#define BITS_LE 0x01
/* Indices into identification array */
#define EI_CLASS 4
#define EI_DATA 5
#define EI_VERSION 6
#define EI_OSABI 7
#define EI_CLASS 4
#define EI_DATA 5
#define EI_VERSION 6
#define EI_OSABI 7
struct elf_hdr {
uint8_t ident[16];
@ -46,6 +46,39 @@ struct elf_phdr {
uint64_t p_align;
};
struct elf_shdr {
uint32_t sh_name;
uint32_t sh_type;
uint64_t sh_flags;
uint64_t sh_addr;
uint64_t sh_offset;
uint64_t sh_size;
uint32_t sh_link;
uint32_t sh_info;
uint64_t sh_addralign;
uint64_t sh_entsize;
};
int load_section(struct echfs_file_handle *fd, void *buffer, char *name) {
struct elf_hdr hdr;
echfs_read(fd, &hdr, 0, sizeof(struct elf_hdr));
struct elf_shdr sections[hdr.sh_num];
echfs_read(fd, sections, hdr.shoff, hdr.sh_num * sizeof(struct elf_shdr));
char names[sections[hdr.shstrndx].sh_size];
echfs_read(fd, names, sections[hdr.shstrndx].sh_offset, sections[hdr.shstrndx].sh_size);
for (uint16_t i = 0; i < hdr.sh_num; i++) {
if(!strcmp(&names[sections[i].sh_name], name)) {
echfs_read(fd, buffer, sections[i].sh_offset, sections[i].sh_size);
return 0;
}
}
return 1;
}
#define FIXED_HIGHER_HALF_OFFSET ((uint64_t)0xffffffff80000000)
int elf_load(struct echfs_file_handle *fd, uint64_t *entry_point) {

1
src/lib/elf.h
View File

@ -5,5 +5,6 @@
#include <fs/echfs.h>
int elf_load(struct echfs_file_handle *fd, uint64_t *entry_point);
void load_section(struct echfs_file_handle *fd, void *buffer, char *name);
#endif