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Fixed addend extraction for R_ARM_THM_MOVW_ABS_NC and R_ARM_THM_MOVT_ABS

This commit is contained in:
Nicolas 2026-02-27 17:58:15 +01:00
parent 20b00109e9
commit 9a4cbe92af
1 changed files with 10 additions and 17 deletions
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25
src/pelfy/_main.py
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@ -575,7 +575,7 @@ class elf_file:
if reloc_types and 'A' in reloc_types[relocation_type][2]:
name = reloc_types[relocation_type][0]
sh = self.sections[reloc_section['sh_info']]
field = self.read_int(r_offset + sh['sh_offset'], 4, True)
field = self.read_int(r_offset + sh['sh_offset'], 4, False)
if name in ('R_386_PC32', 'R_386_32', 'R_X86_64_PC32', 'R_X86_64_PLT32', 'R_ARM_REL32', 'R_ARM_ABS32'):
return field
if name == 'R_ARM_MOVW_ABS_NC':
@ -595,22 +595,15 @@ class elf_file:
return _decode_thumb_branch_imm(field, 22)
if name in ('R_ARM_THM_JUMP24', 'R_ARM_THM_CALL'):
return _decode_thumb_branch_imm(field, 24)
if name == 'R_ARM_THM_MOVW_ABS_NC':
# Extract addend for Thumb MOVW (lower 16 bits)
imm4 = (field >> 16) & 0xF
i = (field >> 26) & 0x1
imm3 = (field >> 12) & 0x7
imm8 = (field >> 0) & 0xFF
addend = (i << 11) | (imm4 << 12) | (imm3 << 8) | imm8
return addend
if name == 'R_ARM_THM_MOVW_ABS_NC' or name == 'R_ARM_THM_MOVT_ABS':
i = (field >> 10) & 1
imm4 = field & 0xF
imm3 = (field >> 28) & 0x7
imm8 = (field >> 16) & 0xFF
imm16 = imm8 | (imm3 << 8) | (i << 11) | (imm4 << 12)
if name == 'R_ARM_THM_MOVT_ABS':
# Extract addend for Thumb MOVT (upper 16 bits)
imm4 = (field >> 16) & 0xF
i = (field >> 26) & 0x1
imm3 = (field >> 12) & 0x7
imm8 = (field >> 0) & 0xFF
addend = ((i << 11) | (imm4 << 12) | (imm3 << 8) | imm8) << 16
return addend
return imm16 << 16
return imm16
if '_THM_' in name:
warnings.warn(f'Thumb relocation addend extraction is for {name} not implemented', stacklevel=2)
return 0