forked from Imagelibrary/rtems
121 lines
3.2 KiB
C
121 lines
3.2 KiB
C
#include <sys/cdefs.h>
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#include <errno.h>
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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <rtems/rtl/rtl.h>
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#include "rtl-elf.h"
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#include "rtl-error.h"
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#include "rtl-trace.h"
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bool
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rtems_rtl_elf_rel_resolve_sym (Elf_Word type)
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{
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return true;
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}
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bool
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rtems_rtl_elf_relocate_rela (const rtems_rtl_obj_t* obj,
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const Elf_Rela* rela,
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const rtems_rtl_obj_sect_t* sect,
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const char* symname,
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const Elf_Byte syminfo,
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const Elf_Word symvalue)
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{
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Elf_Addr *where;
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Elf32_Word tmp;
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Elf32_Word insn;
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where = (Elf_Addr *)(sect->base + rela->r_offset);
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switch (ELF_R_TYPE(rela->r_info)) {
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case R_TYPE(NONE):
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break;
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case R_TYPE(HI16):
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insn = *where;
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/* orhi/mvhi instruction
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* 31--------26|25-21|20-16|15----0|
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* |0 1 1 1 1 0 |rY |rX |imm16 |
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*/
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if (0x1e == (insn >> 26)) {
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insn &= 0xffff0000;
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insn |= ((symvalue + rela->r_addend) >> 16);
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*where = insn;
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}
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break;
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case R_TYPE(LO16):
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insn = *where;
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/* ori instruction
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* 31--------26|25-21|20-16|15----0|
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* |0 0 1 1 1 0 |rY |rX |imm16 |
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*/
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if (0xe == (insn >> 26)) {
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insn &= 0xffff0000;
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insn |= ((symvalue + rela->r_addend) & 0xffff);
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*where = insn;
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}
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break;
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case R_TYPE(CALL):
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insn = *where;
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/*
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* calli instruction
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* 31-------26|25---0|
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* |1 1 1 1 1 0|imm26 |
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* Syntax: call imm26
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* Operation: ra = pc + 4; pc = pc + sign_extend(imm26<<2)
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*/
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if (0x3e == (insn >> 26)) {
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Elf_Sword imm26 = symvalue +rela->r_addend - (Elf_Addr)where;
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imm26 = (imm26 >> 2) & 0x3ffffff;
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insn = 0xf8000000 + imm26;
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*where = insn;
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}
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break;
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case R_TYPE(BRANCH):
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insn = *where;
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tmp = symvalue + rela->r_addend - (Elf_Addr)where;
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tmp = (Elf32_Sword)tmp >> 2;
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if (((Elf32_Sword)tmp > 0x7fff) || ((Elf32_Sword)tmp < -0x8000)){
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printf("BRANCH Overflow\n");
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return false;
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}
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*where = (*where & 0xffff0000) | (tmp & 0xffff);
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break;
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case R_TYPE(32):
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*where = symvalue + rela->r_addend;
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break;
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default:
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rtems_rtl_set_error (EINVAL, "rela type record not supported");
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printf("Unsupported reloc types\n");
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return false;
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}
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if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC)) {
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printf("rela relocation type is %ld\n", ELF_R_TYPE(rela->r_info));
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printf("relocated address 0x%08lx\n", (Elf_Addr)where);
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}
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return true;
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}
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bool
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rtems_rtl_elf_relocate_rel (const rtems_rtl_obj_t* obj,
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const Elf_Rel* rel,
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const rtems_rtl_obj_sect_t* sect,
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const char* symname,
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const Elf_Byte syminfo,
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const Elf_Word symvalue)
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{
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rtems_rtl_set_error (EINVAL, "rela type record not supported");
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return false;
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}
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