ptrace.h

Go to the documentation of this file.

/*
 * 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[];

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);
}

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)));
}

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;

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;
}
#define profile_pc profile_pc

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