Macho64 format on darwin

[goodwillhart@…]

I have some gas assembler code which has been converted to Yasm. It works fine on AMD64 but on a Core 2 machine running Darwin it doesn't assemble. The problem is a reference to a global symbol, which needs to support PIC. Of course with the elf format you have wrt rip wrt ..gotpcrel, but on the Core 2 the object format I need to use is macho64. At present the yasm manual has no information on how to write PIC code for macho64, and ..gotpcrel certainly doesn't work.

[peter@…]

At the moment there's not support for macho64 PIC in yasm, but I'll work on fixing it (should be fairly straightforward). It will still be "wrt ..gotpcrel". See developer.apple.com/documentation/DeveloperTools/Conceptual/MachOTopics/Articles/dynamic_code.html#apple_ref/doc/uid/TP40002528-SW2 for some examples (GAS syntax however).

[peter]

(In [2108]) Fix #141: Add macho64 PIC support. The way PIC relocations are generated for macho64 requires a bit of a hack to detect MOV opcodes and generate GOT_LOAD relocs. GAS contains a similar hack.

[peter]

(In [2142]) Merge [2108] from trunk (Fix #141, macho64 PIC support).