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powerpc: add modify_instruction() and modify_instruction_site() 

Add two helpers to avoid hardcoding of instructions modifications.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Christophe Leroy 2018-11-09 17:33:17 +00:00 committed by Michael Ellerman
parent 45090c2661
commit 36b08b431e
1 changed files with 11 additions and 0 deletions
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11
arch/powerpc/include/asm/code-patching.h
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@ -49,6 +49,17 @@ static inline int patch_branch_site(s32 *site, unsigned long target, int flags)
return patch_branch((unsigned int *)patch_site_addr(site), target, flags);
}
static inline int modify_instruction(unsigned int *addr, unsigned int clr,
unsigned int set)
{
return patch_instruction(addr, (*addr & ~clr) | set);
}
static inline int modify_instruction_site(s32 *site, unsigned int clr, unsigned int set)
{
return modify_instruction((unsigned int *)patch_site_addr(site), clr, set);
}
int instr_is_relative_branch(unsigned int instr);
int instr_is_relative_link_branch(unsigned int instr);
int instr_is_branch_to_addr(const unsigned int *instr, unsigned long addr);