diff options
| author | Suzuki K. Poulose <suzuki@in.ibm.com> | 2012-12-03 20:38:37 +0530 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2013-06-20 16:55:09 +1000 |
| commit | 35fd219a268cc82cef842518cd64ea6949629ba2 (patch) | |
| tree | 2226a6d0fe4a0d36d679905c5680f5ca27db0bab /arch/powerpc/include/asm/probes.h | |
| parent | 85f395c5b0a26b3a80f9e2d35333981a2a75c0ae (diff) | |
powerpc: Move the single step enable code to a generic path
This patch moves the single step enable code used by kprobe to a generic
routine header so that, it can be re-used by other code, in this case,
uprobes. No functional changes.
Signed-off-by: Suzuki K. Poulose <suzuki@in.ibm.com>
Cc: Ananth N Mavinakaynahalli <ananth@in.ibm.com>
Cc: Kumar Gala <galak@kernel.crashing.org>
Cc: linuxppc-dev@ozlabs.org
Acked-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/include/asm/probes.h')
| -rw-r--r-- | arch/powerpc/include/asm/probes.h | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/probes.h b/arch/powerpc/include/asm/probes.h index 5f1e15b68704..3421637cfd7b 100644 --- a/arch/powerpc/include/asm/probes.h +++ b/arch/powerpc/include/asm/probes.h @@ -38,5 +38,30 @@ typedef u32 ppc_opcode_t; #define is_trap(instr) (IS_TW(instr) || IS_TWI(instr)) #endif /* CONFIG_PPC64 */ +#ifdef CONFIG_PPC_ADV_DEBUG_REGS +#define MSR_SINGLESTEP (MSR_DE) +#else +#define MSR_SINGLESTEP (MSR_SE) +#endif + +/* Enable single stepping for the current task */ +static inline void enable_single_step(struct pt_regs *regs) +{ + regs->msr |= MSR_SINGLESTEP; +#ifdef CONFIG_PPC_ADV_DEBUG_REGS + /* + * We turn off Critical Input Exception(CE) to ensure that the single + * step will be for the instruction we have the probe on; if we don't, + * it is possible we'd get the single step reported for CE. + */ + regs->msr &= ~MSR_CE; + mtspr(SPRN_DBCR0, mfspr(SPRN_DBCR0) | DBCR0_IC | DBCR0_IDM); +#ifdef CONFIG_PPC_47x + isync(); +#endif +#endif +} + + #endif /* __KERNEL__ */ #endif /* _ASM_POWERPC_PROBES_H */ |