mirror of
https://github.com/fail0verflow/hbc.git
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114 lines
2.5 KiB
C
114 lines
2.5 KiB
C
/*
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* Copyright (c) 2001 William L. Pitts
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* Modifications (c) 2004 Felix Domke
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are freely
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* permitted provided that the above copyright notice and this
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* paragraph and the following disclaimer are duplicated in all
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* such forms.
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*
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* This software is provided "AS IS" and without any express or
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* implied warranties, including, without limitation, the implied
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* warranties of merchantability and fitness for a particular
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* purpose.
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*/
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#include "common.h"
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#include "elf_abi.h"
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#include "string.h"
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int valid_elf_image (void *addr) {
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Elf32_Ehdr *ehdr; /* Elf header structure pointer */
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ehdr = (Elf32_Ehdr *) addr;
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if (!IS_ELF (*ehdr))
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return 0;
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if (ehdr->e_ident[EI_CLASS] != ELFCLASS32)
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return -1;
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if (ehdr->e_ident[EI_DATA] != ELFDATA2MSB)
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return -1;
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if (ehdr->e_ident[EI_VERSION] != EV_CURRENT)
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return -1;
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if (ehdr->e_type != ET_EXEC)
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return -1;
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if (ehdr->e_machine != EM_PPC)
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return -1;
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return 1;
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}
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u32 load_elf_image(void *addr) {
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Elf32_Ehdr *ehdr;
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Elf32_Phdr *phdrs;
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u8 *image;
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int i;
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ehdr = (Elf32_Ehdr *)addr;
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if(ehdr->e_phoff == 0 || ehdr->e_phnum == 0) {
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printf("ELF has no phdrs\n");
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return 0;
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}
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if(ehdr->e_phentsize != sizeof(Elf32_Phdr)) {
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printf("Invalid ELF phdr size\n");
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return 0;
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}
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phdrs = (Elf32_Phdr*)(addr + ehdr->e_phoff);
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for(i = 0; i < ehdr->e_phnum; i++) {
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if(phdrs[i].p_type != PT_LOAD) {
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printf("skip PHDR %d of type %d\n", i, phdrs[i].p_type);
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continue;
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}
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// translate paddr to this BAT setup
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phdrs[i].p_paddr &= 0x3FFFFFFF;
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phdrs[i].p_paddr |= 0x80000000;
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printf("PHDR %d 0x%08x [0x%x] -> 0x%08x [0x%x] <", i,
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phdrs[i].p_offset, phdrs[i].p_filesz,
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phdrs[i].p_paddr, phdrs[i].p_memsz);
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if(phdrs[i].p_flags & PF_R)
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printf("R");
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if(phdrs[i].p_flags & PF_W)
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printf("W");
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if(phdrs[i].p_flags & PF_X)
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printf("X");
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printf(">\n");
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if(phdrs[i].p_filesz > phdrs[i].p_memsz) {
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printf("-> file size > mem size\n");
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return 0;
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}
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if(phdrs[i].p_filesz) {
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printf("-> load 0x%x\n", phdrs[i].p_filesz);
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image = (u8 *)(addr + phdrs[i].p_offset);
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memcpy((void *)phdrs[i].p_paddr, (const void *)image,
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phdrs[i].p_filesz);
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memset((void *)image, 0, phdrs[i].p_filesz);
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sync_after_write((void *)phdrs[i].p_paddr, phdrs[i].p_memsz);
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if(phdrs[i].p_flags & PF_X)
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sync_before_exec((void *)phdrs[i].p_paddr, phdrs[i].p_memsz);
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} else {
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printf ("-> skip\n");
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}
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}
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// entry point of the ELF _has_ to be correct - no translation done
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return ehdr->e_entry;
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}
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