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[X86] Support i386 PC-relative relocations - #2029
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Bhoumik Patidar (BhoumikPatidar) wants to merge 2 commits into
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Bhoumik Patidar (BhoumikPatidar) wants to merge 2 commits into
Bhoumik Patidar (BhoumikPatidar) wants to merge 2 commits into
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Bhoumik Patidar (BhoumikPatidar)
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October 1, 2026 14:22
Add the relocation layer for i386 links: R_386_NONE, R_386_8, R_386_16, and R_386_32. Unlike x86-64, i386 uses Elf32_Rel rather than Elf64_Rela. The addend is stored in the field being relocated, so it must be read and sign-extended from that field width before evaluating S + A. Normalize the result to the 32-bit ELF address space before checking narrow fields and writing the result back. This preserves valid full-width 32-bit bit patterns, including addresses with bit 31 set, while rejecting values that cannot be encoded in 8- or 16-bit fields. Signed-off-by: Bhoumik Patidar <bpatidar@qti.qualcomm.com>
Implement R_386_PC8, R_386_PC16, and R_386_PC32 for i386 ELF32 links. Use signed range checks for narrow PC-relative relocations. PC8 must fit in a signed 8-bit field, while PC16 accepts a signed 17-bit result before truncating it to 16 bits, as required by 16-bit real-mode code. PC32 uses the full 32-bit field. Signed-off-by: Bhoumik Patidar <bpatidar@qti.qualcomm.com>
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Steven Ramirez Rosa (Steven6798)
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Implement
R_386_PC8,R_386_PC16, andR_386_PC32fori386ELF32 links.Use signed range checks for narrow PC-relative relocations.
PC8must fit in a signed 8-bit field, whilePC16accepts a signed 17-bit result before truncating it to 16 bits, as required by 16-bit real-mode code.PC32uses the full 32-bit field.Resolves #2030
Progress On #1961