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#include <kernel/system.h>
#include <kernel/fs/elf.h>
#include <kernel/lib/stdio.h>
#include <kernel/memory/alloc.h>
#include <kernel/lib/lib.h>
#include <kernel/memory/paging.h>
#define USER_OFFSET 0x40000000
#define USER_STACK 0xF0000000
#define PT_LOAD 0x1
int is_elf(char *elf_data)
{
elf_header_t *header = (elf_header_t *)elf_data;
if (header->ident[0] == 0x7f && header->ident[1] == 'E' && header->ident[2] == 'L' &&
header->ident[3] == 'F') {
log("Buffer is valid ELF file!");
return 1;
}
return 0;
}
uint32_t load_elf(char *elf_data)
{
uint32_t v_begin, v_end;
elf_header_t *hdr;
elf_program_header_t *p_entry;
elf_section_header_t *s_entry;
hdr = (elf_header_t *)elf_data;
p_entry = (elf_program_header_t *)(elf_data + hdr->phoff);
s_entry = (elf_section_header_t *)(elf_data + hdr->shoff);
if (is_elf(elf_data) == 0)
return 0;
for (int pe = 0; pe < hdr->phnum; pe++, p_entry++) {
if (p_entry->type == PT_LOAD) {
v_begin = p_entry->vaddr;
v_end = p_entry->vaddr + p_entry->memsz;
if (v_begin < USER_OFFSET) {
warn("load_elf(): can't load executable below %x", USER_OFFSET);
return 0;
}
if (v_end > USER_STACK) {
warn("load_elf(): can't load executable above %x", USER_STACK);
return 0;
}
log("ELF: entry flags: %x (%d)", p_entry->flags, p_entry->flags);
memcpy((uint8_t *)v_begin, (uint8_t *)(elf_data + p_entry->offset),
p_entry->filesz);
if (p_entry->memsz > p_entry->filesz) {
char *p = (char *)p_entry->vaddr;
for (int i = p_entry->filesz; i < (int)(p_entry->memsz); i++) {
p[i] = 0;
}
}
}
}
return hdr->entry;
}
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