Commit Graph

2 Commits

Author SHA1 Message Date
Simon Atanasyan 462f84a736 [ELF][MIPS] Always collect .reginfo, .MIPS.options, and .MIPS.abiflags input sections
Do not take in account the `Live` flag while collecting .reginfo, .MIPS.options,
and .MIPS.abiflags input sections to produce corresponding output sections.
These sections have information purpose and should be always produced per
ABI requirements.

llvm-svn: 298093
2017-03-17 14:27:55 +00:00
Simon Atanasyan 1d7df40711 [ELF][MIPS] MIPS .reginfo sections handling
MIPS .reginfo section provides information on the registers used by
the code in the object file. Linker should collect this information and
write .reginfo section in the output file. This section contains a union
of used registers masks taken from input .reginfo sections and final
value of the `_gp` symbol.

For details see the "Register Information" section in Chapter 4 in the
following document:
ftp://www.linux-mips.org/pub/linux/mips/doc/ABI/mipsabi.pdf

The patch implements .reginfo sections handling with a couple missed
features: a) it does not put output .reginfo section into the separate
REGINFO segment; b) it does not merge `ri_cprmask` masks from input
section. These features will be implemented later.

Differential Revision: http://reviews.llvm.org/D15669

llvm-svn: 256119
2015-12-20 10:57:34 +00:00