79 lines
2.3 KiB
C
79 lines
2.3 KiB
C
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#include <malloc.h>
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#include <loader/elfloader-arch-otf.h>
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#if 0
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#include <stdio.h>
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#define PRINTF(...) printf(__VA_ARGS__)
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#else
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#define PRINTF(...) do {} while (0)
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#endif
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#define ELF32_R_TYPE(info) ((unsigned char)(info))
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/* Supported relocations */
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#define R_ARM_ABS32 2
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#define R_ARM_THM_CALL 10
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/* Adapted from elfloader-avr.c */
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void
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elfloader_arch_relocate(int input_fd,
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struct elfloader_output *output,
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unsigned int sectionoffset,
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char *sectionaddr,
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struct elf32_rela *rela, char *addr)
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{
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unsigned int type;
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unsigned char instr[4];
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type = ELF32_R_TYPE(rela->r_info);
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cfs_seek(input_fd, sectionoffset + rela->r_offset);
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/* PRINTF("elfloader_arch_relocate: type %d\n", type); */
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/* PRINTF("Addr: %p, Addend: %ld\n", addr, rela->r_addend); */
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switch(type) {
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case R_ARM_ABS32:
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{
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int32_t addend;
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cfs_read(input_fd, (char*)&addend, 4);
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addr += addend;
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elfloader_output_write_segment(output,(char*) &addr, 4);
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PRINTF("%p: addr: %p\n", sectionaddr +rela->r_offset,
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addr);
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}
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break;
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case R_ARM_THM_CALL:
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{
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int32_t offset;
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char *base;
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cfs_read(input_fd, (char*)instr, 4);
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/* Ignore the addend since it will be zero for calls to symbols,
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and I can't think of a case when doing a relative call to
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a non-symbol position */
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base = sectionaddr + (rela->r_offset + 4);
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if (((*(uint16_t*)(instr+2)) & 0x1800) == 0x0800) {
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addr = (char*)((((uint32_t)addr) & 0xfffffffd)
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| (((uint32_t)base) & 0x00000002));
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}
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offset = addr - (sectionaddr + (rela->r_offset + 4));
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if (offset < -(1<<22) || offset >= (1<<22)) {
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PRINTF("elfloader-arm.c: offset %d too large for relative call\n",
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(int)offset);
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}
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/* PRINTF("%p: %04x %04x offset: %d addr: %p\n", sectionaddr +rela->r_offset, *(uint16_t*)instr, *(uint16_t*)(instr+2), (int)offset, addr); */
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*(uint16_t*)instr = (*(uint16_t*)instr & 0xf800) | ((offset>>12)&0x07ff);
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*(uint16_t*)(instr+2) = ((*(uint16_t*)(instr+2) & 0xf800)
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| ((offset>>1)&0x07ff));
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elfloader_output_write_segment(output, (char*)instr, 4);
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/* PRINTF("cfs_write: %04x %04x\n",*(uint16_t*)instr, *(uint16_t*)(instr+2)); */
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}
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break;
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default:
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PRINTF("elfloader-arm.c: unsupported relocation type %d\n", type);
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break;
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}
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}
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