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author | Paul Mundt <lethal@linux-sh.org> | 2010-06-14 06:16:53 (GMT) |
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committer | Paul Mundt <lethal@linux-sh.org> | 2010-06-14 06:16:53 (GMT) |
commit | eaaaeef392cb245e415c31d480ed2d5a466fd88f (patch) | |
tree | 483761495ceb9cc3a277769f52d0ec8abeed1ac0 /arch/sh/include/asm/ptrace.h | |
parent | 9973e38575070b70c68bad177fb5056548fea349 (diff) | |
download | linux-eaaaeef392cb245e415c31d480ed2d5a466fd88f.tar.xz |
sh: Add kprobe-based event tracer.
This follows the x86/ppc changes for kprobe-based event tracing on sh.
While kprobes is only supported on 32-bit sh, we provide the API for
HAVE_REGS_AND_STACK_ACCESS_API for both 32 and 64-bit.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch/sh/include/asm/ptrace.h')
-rw-r--r-- | arch/sh/include/asm/ptrace.h | 89 |
1 files changed, 86 insertions, 3 deletions
diff --git a/arch/sh/include/asm/ptrace.h b/arch/sh/include/asm/ptrace.h index 2168fde..33b3f37 100644 --- a/arch/sh/include/asm/ptrace.h +++ b/arch/sh/include/asm/ptrace.h @@ -1,6 +1,8 @@ #ifndef __ASM_SH_PTRACE_H #define __ASM_SH_PTRACE_H +#include <linux/stringify.h> + /* * Copyright (C) 1999, 2000 Niibe Yutaka * @@ -14,6 +16,13 @@ struct pt_regs { unsigned long long tregs[8]; unsigned long long pad[2]; }; + +#define MAX_REG_OFFSET offsetof(struct pt_regs, tregs[7]) +#define regs_return_value(regs) ((regs)->regs[3]) + +#define TREGS_OFFSET_NAME(num) \ + {.name = __stringify(tr##num), .offset = offsetof(struct pt_regs, tregs[num])} + #else /* * GCC defines register number like this: @@ -66,6 +75,9 @@ struct pt_regs { long tra; }; +#define MAX_REG_OFFSET offsetof(struct pt_regs, tra) +#define regs_return_value(regs) ((regs)->regs[0]) + /* * This struct defines the way the DSP registers are stored on the * kernel stack during a system call or other kernel entry. @@ -113,16 +125,87 @@ struct pt_dspregs { #include <asm/system.h> #define user_mode(regs) (((regs)->sr & 0x40000000)==0) +#define user_stack_pointer(regs) ((unsigned long)(regs)->regs[15]) +#define kernel_stack_pointer(regs) ((unsigned long)(regs)->regs[15]) #define instruction_pointer(regs) ((unsigned long)(regs)->pc) extern void show_regs(struct pt_regs *); +#define arch_has_single_step() (1) + /* - * These are defined as per linux/ptrace.h. + * kprobe-based event tracer support */ -struct task_struct; +#include <linux/stddef.h> +#include <linux/thread_info.h> -#define arch_has_single_step() (1) +struct pt_regs_offset { + const char *name; + int offset; +}; + +#define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)} +#define REGS_OFFSET_NAME(num) \ + {.name = __stringify(r##num), .offset = offsetof(struct pt_regs, regs[num])} +#define REG_OFFSET_END {.name = NULL, .offset = 0} + +/* Query offset/name of register from its name/offset */ +extern int regs_query_register_offset(const char *name); +extern const char *regs_query_register_name(unsigned int offset); + +extern const struct pt_regs_offset regoffset_table[]; + +/** + * 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. The @offset is the + * offset of the register in struct pt_regs address which specified by @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); +} + +/** + * regs_within_kernel_stack() - check the address in the stack + * @regs: pt_regs which contains kernel stack pointer. + * @addr: address which is checked. + * + * regs_within_kernel_stack() checks @addr is within the kernel stack page(s). + * If @addr is within the kernel stack, it returns true. If not, returns false. + */ +static inline int regs_within_kernel_stack(struct pt_regs *regs, + unsigned long addr) +{ + return ((addr & ~(THREAD_SIZE - 1)) == + (kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1))); +} + +/** + * regs_get_kernel_stack_nth() - get Nth entry of the stack + * @regs: pt_regs which contains kernel stack pointer. + * @n: stack entry number. + * + * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which + * is specified by @regs. If the @n th entry is NOT in the kernel stack, + * this returns 0. + */ +static inline unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, + unsigned int n) +{ + unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs); + addr += n; + if (regs_within_kernel_stack(regs, (unsigned long)addr)) + return *addr; + else + return 0; +} struct perf_event; struct perf_sample_data; |