Generic powerpc branch analysis support added in the code patching library which will help the subsequent patch on SW based filtering of branch records in perf.
Signed-off-by: Anshuman Khandual <khand...@linux.vnet.ibm.com> --- arch/powerpc/include/asm/code-patching.h | 15 ++++++++ arch/powerpc/lib/code-patching.c | 60 ++++++++++++++++++++++++++++++++ 2 files changed, 75 insertions(+) diff --git a/arch/powerpc/include/asm/code-patching.h b/arch/powerpc/include/asm/code-patching.h index 840a550..0a6f0d8 100644 --- a/arch/powerpc/include/asm/code-patching.h +++ b/arch/powerpc/include/asm/code-patching.h @@ -22,6 +22,16 @@ #define BRANCH_SET_LINK 0x1 #define BRANCH_ABSOLUTE 0x2 +#define XL_FORM_LR 0x4C000020 +#define XL_FORM_CTR 0x4C000420 +#define XL_FORM_TAR 0x4C000460 + +#define BO_ALWAYS 0x02800000 +#define BO_CTR 0x02000000 +#define BO_CRBI_OFF 0x00800000 +#define BO_CRBI_ON 0x01800000 +#define BO_CRBI_HINT 0x00400000 + unsigned int create_branch(const unsigned int *addr, unsigned long target, int flags); unsigned int create_cond_branch(const unsigned int *addr, @@ -99,4 +109,9 @@ static inline unsigned long ppc_global_function_entry(void *func) #endif } +bool instr_is_return_branch(unsigned int instr); +bool instr_is_conditional_branch(unsigned int instr); +bool instr_is_func_call(unsigned int instr); +bool instr_is_indirect_func_call(unsigned int instr); + #endif /* _ASM_POWERPC_CODE_PATCHING_H */ diff --git a/arch/powerpc/lib/code-patching.c b/arch/powerpc/lib/code-patching.c index d5edbeb..46fbcca 100644 --- a/arch/powerpc/lib/code-patching.c +++ b/arch/powerpc/lib/code-patching.c @@ -87,6 +87,66 @@ static int instr_is_branch_bform(unsigned int instr) return branch_opcode(instr) == 16; } +static bool instr_is_branch_xlform(unsigned int instr) +{ + return branch_opcode(instr) == 19; +} + +static bool is_xlform_lr(unsigned int instr) +{ + return (instr & XL_FORM_LR) == XL_FORM_LR; +} + +static bool is_bo_always(unsigned int instr) +{ + return (instr & BO_ALWAYS) == BO_ALWAYS; +} + +static bool is_branch_link_set(unsigned int instr) +{ + return (instr & BRANCH_SET_LINK) == BRANCH_SET_LINK; +} + +bool instr_is_return_branch(unsigned int instr) +{ + /* + * Conditional and unconditional branch to LR register + * without seting the link register. + */ + if (is_xlform_lr(instr) && !is_branch_link_set(instr)) + return true; + + return false; +} + +bool instr_is_conditional_branch(unsigned int instr) +{ + /* I-form instruction - excluded */ + if (instr_is_branch_iform(instr)) + return false; + + /* B-form or XL-form instruction */ + if (instr_is_branch_bform(instr) || instr_is_branch_xlform(instr)) { + + /* Not branch always */ + if (!is_bo_always(instr)) + return true; + } + return false; +} + +bool instr_is_func_call(unsigned int instr) +{ + /* LR should be set */ + return is_branch_link_set(instr); +} + +bool instr_is_indirect_func_call(unsigned int instr) +{ + /* XL-form instruction with LR set */ + return (instr_is_branch_xlform(instr) && is_branch_link_set(instr)); +} + int instr_is_relative_branch(unsigned int instr) { if (instr & BRANCH_ABSOLUTE) -- 2.1.0 _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev