cregit-Linux how code gets into the kernel

Release 4.7 arch/sh/include/asm/ptrace.h

/*
 * Copyright (C) 1999, 2000  Niibe Yutaka
 */
#ifndef __ASM_SH_PTRACE_H

#define __ASM_SH_PTRACE_H


#include <linux/stringify.h>
#include <linux/stddef.h>
#include <linux/thread_info.h>
#include <asm/addrspace.h>
#include <asm/page.h>
#include <uapi/asm/ptrace.h>


#define user_mode(regs)			(((regs)->sr & 0x40000000)==0)

#define kernel_stack_pointer(_regs)	((unsigned long)(_regs)->regs[15])


#define GET_FP(regs)	((regs)->regs[14])

#define GET_USP(regs)	((regs)->regs[15])


#define arch_has_single_step()	(1)

/*
 * kprobe-based event tracer support
 */

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 TREGS_OFFSET_NAME(num)	\
	{.name = __stringify(tr##num), .offset = offsetof(struct pt_regs, tregs[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); }

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paul mundtpaul mundt46100.00%1100.00%
Total46100.00%1100.00%

/** * 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))); }

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paul mundtpaul mundt44100.00%1100.00%
Total44100.00%1100.00%

/** * 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; }

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paul mundtpaul mundt57100.00%1100.00%
Total57100.00%1100.00%

struct perf_event; struct perf_sample_data; extern void ptrace_triggered(struct perf_event *bp, struct perf_sample_data *data, struct pt_regs *regs); #define task_pt_regs(task) \ ((struct pt_regs *) (task_stack_page(task) + THREAD_SIZE) - 1)
static inline unsigned long profile_pc(struct pt_regs *regs) { unsigned long pc = regs->pc; if (virt_addr_uncached(pc)) return CAC_ADDR(pc); return pc; }

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william lee irwin iiiwilliam lee irwin iii2772.97%133.33%
paul mundtpaul mundt1027.03%266.67%
Total37100.00%3100.00%

#define profile_pc profile_pc #include <asm-generic/ptrace.h> #endif /* __ASM_SH_PTRACE_H */

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paul mundtpaul mundt28880.22%853.33%
william lee irwin iiiwilliam lee irwin iii277.52%16.67%
pre-gitpre-git215.85%16.67%
mike frysingermike frysinger92.51%16.67%
al viroal viro71.95%16.67%
david howellsdavid howells41.11%16.67%
roel kluinroel kluin20.56%16.67%
magnus dammmagnus damm10.28%16.67%
Total359100.00%15100.00%
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