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Implement IMAGE_REL_BASED_THUMB_MOV32 relocation

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Signed-off-by: Simon Rozman <simon@rozman.si>
This commit is contained in:
Simon Rozman
2020-11-07 21:06:15 +01:00
parent 0a984057da
commit 5e850c0b76
1 changed files with 38 additions and 0 deletions
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MemoryModule.c
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@@ -430,6 +430,44 @@ PerformBaseRelocation(PMEMORYMODULE module, ptrdiff_t delta)
}
break;
case IMAGE_REL_BASED_THUMB_MOV32:
{
DWORD inst = *(DWORD *)(dest + offset);
DWORD imm16 = ((inst << 1) & 0x0800) + ((inst << 12) & 0xf000) +
((inst >> 20) & 0x0700) + ((inst >> 16) & 0x00ff);
DWORD hi_delta;
if ((inst & 0x8000fbf0) != 0x0000f240)
fwprintf(stdout, L"wrong Thumb2 instruction %08x, expected MOVW\n", inst);
imm16 += LOWORD(delta);
hi_delta = HIWORD(delta) + HIWORD(imm16);
*(DWORD *)(dest + offset) = (inst & 0x8f00fbf0) + ((imm16 >> 1) & 0x0400) +
((imm16 >> 12) & 0x000f) +
((imm16 << 20) & 0x70000000) +
((imm16 << 16) & 0xff0000);
if (hi_delta != 0)
{
inst = *(DWORD *)(dest + offset + 4);
imm16 = ((inst << 1) & 0x0800) + ((inst << 12) & 0xf000) +
((inst >> 20) & 0x0700) + ((inst >> 16) & 0x00ff);
if ((inst & 0x8000fbf0) != 0x0000f2c0)
fwprintf(stdout, L"wrong Thumb2 instruction %08x, expected MOVT\n", inst);
imm16 += hi_delta;
if (imm16 > 0xffff)
fwprintf(stdout, L"resulting immediate value won't fit: %08x\n", imm16);
*(DWORD *)(dest + offset + 4) = (inst & 0x8f00fbf0) +
((imm16 >> 1) & 0x0400) +
((imm16 >> 12) & 0x000f) +
((imm16 << 20) & 0x70000000) +
((imm16 << 16) & 0xff0000);
}
}
break;
default:
//printf("Unknown relocation: %d\n", type);
break;