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linux/tools/objtool
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Peter Zijlstra 2d49b721dc objtool: Only rewrite unconditional retpoline thunk calls 
It turns out that the compilers generate conditional branches to the
retpoline thunks like:

  5d5:   0f 85 00 00 00 00       jne    5db <cpuidle_reflect+0x22>
	5d7: R_X86_64_PLT32     __x86_indirect_thunk_r11-0x4

while the rewrite can only handle JMP/CALL to the thunks. The result
is the alternative wrecking the code. Make sure to skip writing the
alternatives for conditional branches.

Fixes: 9bc0bb5072 ("objtool/x86: Rewrite retpoline thunk calls")
Reported-by: Lukasz Majczak <lma@semihalf.com>
Reported-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Nathan Chancellor <nathan@kernel.org>
2021-06-11 08:53:06 +02:00
..
arch/x86 objtool: Only rewrite unconditional retpoline thunk calls 2021-06-11 08:53:06 +02:00
Documentation objtool: Support stack layout changes in alternatives 2021-01-14 09:53:54 -06:00
include/objtool Objtool updates in this cycle were: 2021-04-28 12:53:24 -07:00
.gitignore objtool: Rework header include paths 2021-01-13 18:13:14 -06:00
Build objtool: Enable compilation of objtool for all architectures 2020-05-20 09:17:28 -05:00
builtin-check.c objtool: Parse options from OBJTOOL_ARGS 2021-03-06 12:44:23 +01:00
builtin-orc.c objtool: Collate parse_options() users 2021-03-06 12:44:23 +01:00
check.c Objtool updates in this cycle were: 2021-04-28 12:53:24 -07:00
elf.c objtool: Fix .symtab_shndx handling for elf_create_undef_symbol() 2021-06-10 10:08:24 +02:00
Makefile objtool: Refactor ORC section generation 2021-01-14 09:53:42 -06:00
objtool.c Objtool updates in this cycle were: 2021-04-28 12:53:24 -07:00
orc_dump.c x86/unwind/orc: Change REG_SP_INDIRECT 2021-02-10 20:53:51 +01:00
orc_gen.c objtool: Create reloc sections implicitly 2021-04-02 12:44:37 +02:00
special.c objtool: Skip magical retpoline .altinstr_replacement 2021-04-02 12:46:57 +02:00
sync-check.sh Merge branch 'x86/cpu' into WIP.x86/core, to merge the NOP changes & resolve a semantic conflict 2021-04-02 12:36:30 +02:00
weak.c objtool: Refactor ORC section generation 2021-01-14 09:53:42 -06:00