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MIPS: Enable HAVE_ARCH_TRACEHOOK.

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This enables /proc/<pid>/syscall and the ptrace PTRACE_GETREGSET and
PTRACE_SETREGSET operations.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Ralf Baechle 2012-08-17 08:22:04 +02:00
parent 6a9c001b7e
commit c0ff3c53d4
3 changed files with 81 additions and 1 deletions
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1
arch/mips/Kconfig
View File

@ -8,6 +8,7 @@ config MIPS
select HAVE_PERF_EVENTS
select PERF_USE_VMALLOC
select HAVE_ARCH_KGDB
select HAVE_ARCH_TRACEHOOK
select ARCH_HAVE_CUSTOM_GPIO_H
select HAVE_FUNCTION_TRACER
select HAVE_FUNCTION_TRACE_MCOUNT_TEST

14
arch/mips/include/asm/ptrace.h
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@ -81,7 +81,6 @@ static inline long regs_return_value(struct pt_regs *regs)
#define instruction_pointer(regs) ((regs)->cp0_epc)
#define profile_pc(regs) instruction_pointer(regs)
#define user_stack_pointer(r) ((r)->regs[29])
extern asmlinkage void syscall_trace_enter(struct pt_regs *regs);
extern asmlinkage void syscall_trace_leave(struct pt_regs *regs);
@ -100,4 +99,17 @@ static inline void die_if_kernel(const char *str, struct pt_regs *regs)
(struct pt_regs *)((sp | (THREAD_SIZE - 1)) + 1 - 32) - 1; \
})
/* Helpers for working with the user stack pointer */
static inline unsigned long user_stack_pointer(struct pt_regs *regs)
{
return regs->regs[29];
}
static inline void user_stack_pointer_set(struct pt_regs *regs,
unsigned long val)
{
regs->regs[29] = val;
}
#endif /* _ASM_PTRACE_H */

67
arch/mips/include/asm/syscall.h
View File

@ -1,14 +1,81 @@
/*
* Access to user system call parameters and results
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* See asm-generic/syscall.h for descriptions of what we must do here.
*
* Copyright (C) 2012 Ralf Baechle <ralf@linux-mips.org>
*/
#ifndef __ASM_MIPS_SYSCALL_H
#define __ASM_MIPS_SYSCALL_H
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/uaccess.h>
#include <asm/ptrace.h>
static inline long syscall_get_nr(struct task_struct *task,
struct pt_regs *regs)
{
return regs->regs[2];
}
static inline unsigned long mips_get_syscall_arg(unsigned long *arg,
struct task_struct *task, struct pt_regs *regs, unsigned int n)
{
unsigned long usp = regs->regs[29];
switch (n) {
case 0: case 1: case 2: case 3:
*arg = regs->regs[4 + n];
return 0;
#ifdef CONFIG_32BIT
case 4: case 5: case 6: case 7:
return get_user(*arg, (int *)usp + 4 * n);
#endif
#ifdef CONFIG_64BIT
case 4: case 5: case 6: case 7:
#ifdef CONFIG_MIPS32_O32
if (test_thread_flag(TIF_32BIT_REGS))
return get_user(*arg, (int *)usp + 4 * n);
else
#endif
*arg = regs->regs[4 + n];
return 0;
#endif
default:
BUG();
}
}
static inline void syscall_get_arguments(struct task_struct *task,
struct pt_regs *regs,
unsigned int i, unsigned int n,
unsigned long *args)
{
unsigned long arg;
int ret;
while (n--)
ret |= mips_get_syscall_arg(&arg, task, regs, i++);
/*
* No way to communicate an error because this is a void function.
*/
#if 0
return ret;
#endif
}
extern const unsigned long sys_call_table[];
extern const unsigned long sys32_call_table[];
extern const unsigned long sysn32_call_table[];