diff options
| author | Will Deacon <will.deacon@arm.com> | 2010-06-25 15:24:53 +0400 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2010-07-09 17:41:34 +0400 |
| commit | e513f8bf240d34bd6e732ba2f74df9ab84686ce6 (patch) | |
| tree | 989f646d90b42b583ea1cd51d34ecccf9afd8027 /arch/arm/include/asm/ptrace.h | |
| parent | eb668c6d06dd4f935fc610207c58a5f221384651 (diff) | |
| download | linux-e513f8bf240d34bd6e732ba2f74df9ab84686ce6.tar.xz | |
ARM: 6199/1: Add kprobe-based event tracer
This patch enables the HAVE_REGS_AND_STACK_ACCESS_API option
for ARM which is required by the kprobe events tracer. Code based
on the PowerPC port.
Cc: Jean Pihet <jpihet@mvista.com>
Tested-by: Jamie Iles <jamie.iles@picochip.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/include/asm/ptrace.h')
| -rw-r--r-- | arch/arm/include/asm/ptrace.h | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/arch/arm/include/asm/ptrace.h b/arch/arm/include/asm/ptrace.h index 9dcb11e59026..c974be8913a7 100644 --- a/arch/arm/include/asm/ptrace.h +++ b/arch/arm/include/asm/ptrace.h @@ -184,6 +184,42 @@ extern unsigned long profile_pc(struct pt_regs *regs); #define predicate(x) ((x) & 0xf0000000) #define PREDICATE_ALWAYS 0xe0000000 +/* + * kprobe-based event tracer support + */ +#include <linux/stddef.h> +#include <linux/types.h> +#define MAX_REG_OFFSET (offsetof(struct pt_regs, ARM_ORIG_r0)) + +extern int regs_query_register_offset(const char *name); +extern const char *regs_query_register_name(unsigned int offset); +extern bool regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr); +extern unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, + unsigned int n); + +/** + * regs_get_register() - get register value from its offset + * @regs: pt_regs from which register value is gotten + * @offset: offset number of the register. + * + * regs_get_register returns the value of a register whose offset from @regs. + * The @offset is the offset of the register in struct pt_regs. + * If @offset is bigger than MAX_REG_OFFSET, this returns 0. + */ +static inline unsigned long regs_get_register(struct pt_regs *regs, + unsigned int offset) +{ + if (unlikely(offset > MAX_REG_OFFSET)) + return 0; + return *(unsigned long *)((unsigned long)regs + offset); +} + +/* Valid only for Kernel mode traps. */ +static inline unsigned long kernel_stack_pointer(struct pt_regs *regs) +{ + return regs->ARM_sp; +} + #endif /* __KERNEL__ */ #endif /* __ASSEMBLY__ */ |