diff options
Diffstat (limited to 'src/kernel/fs/elfloader.c')
| -rw-r--r-- | src/kernel/fs/elfloader.c | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/src/kernel/fs/elfloader.c b/src/kernel/fs/elfloader.c new file mode 100644 index 0000000..5b81a5e --- /dev/null +++ b/src/kernel/fs/elfloader.c @@ -0,0 +1,64 @@ +#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> +#include "load.h" + +elf_priv_data *elf_probe(uint8_t *buf) +{ + elf_header_t *header = (elf_header_t *) buf; + /* The first four bytes are 0x7f and 'ELF' */ + if (header->e_ident[0] == 0x7f && + header->e_ident[1] == 'E' && header->e_ident[2] == 'L' && header->e_ident[3] == 'F') { + /* Valid ELF! */ + serial_printf("Buffer is valid ELF file!"); + return (void *) 1; + } + return 0; +} + +uint8_t elf_start(uint8_t *buf) +{ + elf_header_t *header = (elf_header_t *) buf; + serial_printf("Type: %s%s%s", + header->e_ident[4] == 1 ? "32bit " : "64 bit", + header->e_ident[5] == 1 ? "Little Endian " : "Big endian ", + header->e_ident[6] == 1 ? "True ELF " : "buggy ELF "); + if (header->e_type != 2) { + serial_printf("File is not executable!"); + return 0; + } + /* Map the virtual space */ + uint32_t phys_loc = loader_get_unused_load_location(); + uint32_t cr3 = kmalloc(4096); + /* Find first program header and loop through them */ + elf_program_header_t *ph = (elf_program_header_t *) (buf + header->e_phoff); + for (int i = 0; i < header->e_phnum; i++, ph++) { + switch (ph->p_type) { + case 0: /* NULL */ + break; + case 1: /* LOAD */ + serial_printf("LOAD: offset 0x%x vaddr 0x%x paddr 0x%x filesz 0x%x memsz 0x%x", + ph->p_offset, ph->p_vaddr, ph->p_paddr, ph->p_filesz, ph->p_memsz); + paging_map(phys_loc, ph->p_vaddr, PT_PRESENT | PT_RW | PT_USED); + memcpy(ph->p_vaddr, buf + ph->p_offset, ph->p_filesz); + break; + default: /* @TODO add more */ + serial_printf("Unsupported p_type! Bail out!"); + return 0; + } + } + + return 0;//START("elf32", header->e_entry); +} + +void elf_init() +{ + loader_t *elfloader = (loader_t *) kmalloc(sizeof(loader_t)); + elfloader->name = "ELF32"; + elfloader->probe = (void *) elf_probe; + elfloader->start = (void *) elf_start; + register_loader(elfloader); + // _kill(); +}
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