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Fangrui Song 50bcd0d170 [llvm-objcopy][ELF] -O binary: use LMA instead of sh_offset to decide where to write section contents

.text sh_address=0x1000 sh_offset=0x1000
.data sh_address=0x3000 sh_offset=0x2000

In an objcopy -O binary output, the distance between two sections equal
their LMA differences (0x3000-0x1000), instead of their sh_offset
differences (0x2000-0x1000). This patch changes our behavior to match
GNU.

This rule gets more complex when the containing PT_LOAD has
p_vaddr!=p_paddr. GNU objcopy essentially computes
sh_offset-p_offset+p_paddr for each candidate section, and removes the
gap before the first address.

Added tests to binary-paddr.test to catch the compatibility problem.

Reviewed By: jhenderson

Differential Revision: https://reviews.llvm.org/D71035

2019-12-15 21:45:25 -08:00

COFF

[llvm-objcopy] [COFF] Fix a typo in a comment. NFC.

2019-11-27 10:44:42 +02:00

ELF

[llvm-objcopy][ELF] -O binary: use LMA instead of sh_offset to decide where to write section contents

2019-12-15 21:45:25 -08:00

MachO

[llvm-objcopy][MachO] Implement --add-section

2019-12-16 14:07:29 +09:00

Buffer.cpp

[llvm-objcopy][NFC] Remove unnecessary llvm-objcopy.h #includes