105 lines
2.6 KiB
C
105 lines
2.6 KiB
C
#include <gccore.h>
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#include <string.h>
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#include <malloc.h>
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#include <stdio.h>
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#include "loader.h"
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#include "elf_abi.h"
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bool ExecIsElf(const u8* buffer)
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{
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Elf32_Ehdr* ehdr = (Elf32_Ehdr*)buffer;
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if (!IS_ELF(*ehdr))
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return false;
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if (ehdr->e_ident[EI_CLASS] != ELFCLASS32)
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return false;
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if (ehdr->e_ident[EI_DATA] != ELFDATA2MSB)
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return false;
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if (ehdr->e_ident[EI_VERSION] != EV_CURRENT)
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return false;
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if (ehdr->e_type != ET_EXEC)
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return false;
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if (ehdr->e_machine != EM_PPC)
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return false;
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return true;
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}
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bool LoadElf(entrypoint* entry, const u8* buffer)
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{
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int i;
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Elf32_Ehdr* ehdr = (Elf32_Ehdr*)buffer;
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if (ehdr->e_phoff == 0 || ehdr->e_phnum == 0)
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return false;
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if (ehdr->e_phentsize != (sizeof(Elf32_Phdr)))
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return false;
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Elf32_Phdr* phdrs = (Elf32_Phdr*)(buffer + ehdr->e_phoff);
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for (i = 0; i < ehdr->e_phnum; i++)
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{
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if (phdrs[i].p_type == PT_LOAD)
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{
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phdrs[i].p_paddr &= 0x3FFFFFFF;
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phdrs[i].p_paddr |= 0x80000000;
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if (phdrs[i].p_filesz > phdrs[i].p_memsz)
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return false;
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if (phdrs[i].p_filesz)
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{
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memmove((void*)phdrs[i].p_paddr, (void*)(buffer + phdrs[i].p_offset), phdrs[i].p_filesz);
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DCFlushRange((void*)phdrs[i].p_paddr, phdrs[i].p_memsz);
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if (phdrs[i].p_flags & PF_X)
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ICInvalidateRange((void*)phdrs[i].p_paddr, phdrs[i].p_memsz);
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}
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}
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}
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*entry = (entrypoint)((ehdr->e_entry & 0x3FFFFFFF) | 0x80000000);
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return true;
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}
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bool LoadDol(entrypoint* entry, const u8* buffer)
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{
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u32 i;
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dolhdr* dol = (dolhdr*)buffer;
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for (i = 0; i < 7; i++)
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{
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if (dol->sizeText[i] == 0 || dol->addressText[i] < 0x100)
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continue;
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//printf(" Move text section %u @ 0x%08x -> 0x%08x (0x%0X bytes)\n", i, (u32)(buffer + dol->offsetText[i]), dol->addressText[i], dol->sizeText[i]);
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memmove((void*)dol->addressText[i], buffer + dol->offsetText[i], dol->sizeText[i]);
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DCFlushRange((void*)dol->addressText[i], dol->sizeText[i]);
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ICInvalidateRange((void*)dol->addressText[i], dol->sizeText[i]);
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}
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for (i = 0; i < 11; i++)
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{
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if (dol->sizeData[i] == 0)
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continue;
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//printf(" Move data section %u @ 0x%08x -> 0x%08x (0x%0X bytes)\n", i, (u32)(buffer + dol->offsetData[i]), dol->addressData[i], dol->sizeData[i]);
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memmove((void*)dol->addressData[i], buffer + dol->offsetData[i], dol->sizeData[i]);
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DCFlushRange((void*)dol->addressData[i], dol->sizeData[i]);
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}
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*entry = (entrypoint)dol->entrypoint;
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return true;
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}
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