From 6482f0d6af10262ca6586327090a47f2feaf0fea Mon Sep 17 00:00:00 2001 From: Michael Ellerman Date: Thu, 11 Apr 2019 21:46:13 +1000 Subject: powerpc/asm: Add a patch_site macro & helpers for patching instructions commit 06d0bbc6d0f56dacac3a79900e9a9a0d5972d818 upstream. Add a macro and some helper C functions for patching single asm instructions. The gas macro means we can do something like: 1: nop patch_site 1b, patch__foo Which is less visually distracting than defining a GLOBAL symbol at 1, and also doesn't pollute the symbol table which can confuse eg. perf. These are obviously similar to our existing feature sections, but are not automatically patched based on CPU/MMU features, rather they are designed to be manually patched by C code at some arbitrary point. Signed-off-by: Michael Ellerman Signed-off-by: Sasha Levin --- arch/powerpc/include/asm/code-patching.h | 2 ++ 1 file changed, 2 insertions(+) (limited to 'arch/powerpc/include/asm/code-patching.h') diff --git a/arch/powerpc/include/asm/code-patching.h b/arch/powerpc/include/asm/code-patching.h index b4ab1f497335..ab934f8232bd 100644 --- a/arch/powerpc/include/asm/code-patching.h +++ b/arch/powerpc/include/asm/code-patching.h @@ -28,6 +28,8 @@ unsigned int create_cond_branch(const unsigned int *addr, unsigned long target, int flags); int patch_branch(unsigned int *addr, unsigned long target, int flags); int patch_instruction(unsigned int *addr, unsigned int instr); +int patch_instruction_site(s32 *addr, unsigned int instr); +int patch_branch_site(s32 *site, unsigned long target, int flags); int instr_is_relative_branch(unsigned int instr); int instr_is_relative_link_branch(unsigned int instr); -- cgit v1.2.3