129 lines
3.9 KiB
C
129 lines
3.9 KiB
C
#define _SYSTEM 1
|
|
|
|
#include <minix/type.h>
|
|
#include <minix/const.h>
|
|
#include <sys/param.h>
|
|
#include <assert.h>
|
|
#include <unistd.h>
|
|
#include <errno.h>
|
|
#include <libexec.h>
|
|
|
|
/* For verbose logging */
|
|
#define ELF_DEBUG 0
|
|
|
|
/* Support only 32-bit ELF objects */
|
|
#define __ELF_WORD_SIZE 32
|
|
|
|
static int __elfN(check_header)(const Elf_Ehdr *hdr);
|
|
|
|
int read_header_elf(
|
|
const char *exec_hdr, /* executable header */
|
|
vir_bytes *text_addr, /* text virtual address */
|
|
vir_bytes *text_filebytes, /* text segment size (in the file) */
|
|
vir_bytes *text_membytes, /* text segment size (in memory) */
|
|
vir_bytes *data_addr, /* data virtual address */
|
|
vir_bytes *data_filebytes, /* data segment size (in the file) */
|
|
vir_bytes *data_membytes, /* data segment size (in memory) */
|
|
phys_bytes *tot_bytes, /* total size */
|
|
vir_bytes *pc, /* program entry point (initial PC) */
|
|
off_t *text_offset, /* file offset to text segment */
|
|
off_t *data_offset /* file offset to data segment */
|
|
)
|
|
{
|
|
const Elf_Ehdr *hdr = NULL;
|
|
const Elf_Phdr *phdr = NULL;
|
|
unsigned long seg_filebytes, seg_membytes, seg_addr;
|
|
int i = 0;
|
|
|
|
assert(exec_hdr != NULL);
|
|
|
|
*text_addr = *text_filebytes = *text_membytes = 0;
|
|
*data_addr = *data_filebytes = *data_membytes = 0;
|
|
*tot_bytes = *pc = *text_offset = *data_offset = 0;
|
|
|
|
hdr = (const Elf_Ehdr *)exec_hdr;
|
|
if (__elfN(check_header)(hdr) != OK || (hdr->e_type != ET_EXEC))
|
|
{
|
|
return ENOEXEC;
|
|
}
|
|
|
|
if ((hdr->e_phoff > PAGE_SIZE) ||
|
|
(hdr->e_phoff + hdr->e_phentsize * hdr->e_phnum) > PAGE_SIZE) {
|
|
return ENOEXEC;
|
|
}
|
|
|
|
phdr = (const Elf_Phdr *)(exec_hdr + hdr->e_phoff);
|
|
if (!_minix_aligned(phdr, Elf_Addr)) {
|
|
return ENOEXEC;
|
|
}
|
|
|
|
#if ELF_DEBUG
|
|
printf("Program header file offset (phoff): %d\n", hdr->e_phoff);
|
|
printf("Section header file offset (shoff): %d\n", hdr->e_shoff);
|
|
printf("Program header entry size (phentsize): %d\n", hdr->e_phentsize);
|
|
printf("Program header entry num (phnum): %d\n", hdr->e_phnum);
|
|
printf("Section header entry size (shentsize): %d\n", hdr->e_shentsize);
|
|
printf("Section header entry num (shnum): %d\n", hdr->e_shnum);
|
|
printf("Section name strings index (shstrndx): %d\n", hdr->e_shstrndx);
|
|
printf("Entry Point: 0x%x\n", hdr->e_entry);
|
|
#endif
|
|
|
|
for (i = 0; i < hdr->e_phnum; i++) {
|
|
switch (phdr[i].p_type) {
|
|
case PT_LOAD:
|
|
if (phdr[i].p_memsz == 0)
|
|
break;
|
|
seg_addr = phdr[i].p_vaddr;
|
|
seg_filebytes = phdr[i].p_filesz;
|
|
seg_membytes = round_page(phdr[i].p_memsz + phdr[i].p_vaddr -
|
|
trunc_page(phdr[i].p_vaddr));
|
|
|
|
if (hdr->e_entry >= phdr[i].p_vaddr &&
|
|
hdr->e_entry < (phdr[i].p_vaddr + phdr[i].p_memsz)) {
|
|
*text_addr = seg_addr;
|
|
*text_filebytes = seg_filebytes;
|
|
*text_membytes = seg_membytes;
|
|
*pc = (vir_bytes)hdr->e_entry;
|
|
*text_offset = phdr[i].p_offset;
|
|
} else {
|
|
*data_addr = seg_addr;
|
|
*data_filebytes = seg_filebytes;
|
|
*data_membytes = seg_membytes;
|
|
*data_offset = phdr[i].p_offset;
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
*tot_bytes = 0; /* Use default stack size */
|
|
|
|
#if ELF_DEBUG
|
|
printf("Text addr: 0x%x\n", *text_addr);
|
|
printf("Text filebytes: 0x%x\n", *text_filebytes);
|
|
printf("Text membytes: 0x%x\n", *text_membytes);
|
|
printf("Data addr: 0x%x\n", *data_addr);
|
|
printf("Data filebyte: 0x%x\n", *data_filebytes);
|
|
printf("Data membytes: 0x%x\n", *data_membytes);
|
|
printf("Tot bytes: 0x%x\n", *tot_bytes);
|
|
printf("PC: 0x%x\n", *pc);
|
|
printf("Text offset: 0x%x\n", *text_offset);
|
|
printf("Data offset: 0x%x\n", *data_offset);
|
|
#endif
|
|
|
|
return OK;
|
|
}
|
|
|
|
static int __elfN(check_header)(const Elf_Ehdr *hdr)
|
|
{
|
|
if (!IS_ELF(*hdr) ||
|
|
hdr->e_ident[EI_DATA] != ELF_TARG_DATA ||
|
|
hdr->e_ident[EI_VERSION] != EV_CURRENT ||
|
|
hdr->e_phentsize != sizeof(Elf_Phdr) ||
|
|
hdr->e_version != ELF_TARG_VER)
|
|
return ENOEXEC;
|
|
|
|
return OK;
|
|
}
|