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MIPS: Enable HAVE_ARCH_TRACEHOOK.
This enables /proc/<pid>/syscall and the ptrace PTRACE_GETREGSET and PTRACE_SETREGSET operations. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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@ -8,6 +8,7 @@ config MIPS
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select HAVE_PERF_EVENTS
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select PERF_USE_VMALLOC
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select HAVE_ARCH_KGDB
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select HAVE_ARCH_TRACEHOOK
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select ARCH_HAVE_CUSTOM_GPIO_H
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select HAVE_FUNCTION_TRACER
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select HAVE_FUNCTION_TRACE_MCOUNT_TEST
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@ -81,7 +81,6 @@ static inline long regs_return_value(struct pt_regs *regs)
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#define instruction_pointer(regs) ((regs)->cp0_epc)
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#define profile_pc(regs) instruction_pointer(regs)
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#define user_stack_pointer(r) ((r)->regs[29])
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extern asmlinkage void syscall_trace_enter(struct pt_regs *regs);
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extern asmlinkage void syscall_trace_leave(struct pt_regs *regs);
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@ -100,4 +99,17 @@ static inline void die_if_kernel(const char *str, struct pt_regs *regs)
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(struct pt_regs *)((sp | (THREAD_SIZE - 1)) + 1 - 32) - 1; \
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})
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/* Helpers for working with the user stack pointer */
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static inline unsigned long user_stack_pointer(struct pt_regs *regs)
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{
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return regs->regs[29];
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}
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static inline void user_stack_pointer_set(struct pt_regs *regs,
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unsigned long val)
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{
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regs->regs[29] = val;
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}
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#endif /* _ASM_PTRACE_H */
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@ -1,14 +1,81 @@
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/*
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* Access to user system call parameters and results
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* See asm-generic/syscall.h for descriptions of what we must do here.
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*
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* Copyright (C) 2012 Ralf Baechle <ralf@linux-mips.org>
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*/
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#ifndef __ASM_MIPS_SYSCALL_H
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#define __ASM_MIPS_SYSCALL_H
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/uaccess.h>
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#include <asm/ptrace.h>
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static inline long syscall_get_nr(struct task_struct *task,
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struct pt_regs *regs)
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{
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return regs->regs[2];
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}
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static inline unsigned long mips_get_syscall_arg(unsigned long *arg,
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struct task_struct *task, struct pt_regs *regs, unsigned int n)
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{
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unsigned long usp = regs->regs[29];
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switch (n) {
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case 0: case 1: case 2: case 3:
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*arg = regs->regs[4 + n];
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return 0;
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#ifdef CONFIG_32BIT
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case 4: case 5: case 6: case 7:
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return get_user(*arg, (int *)usp + 4 * n);
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#endif
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#ifdef CONFIG_64BIT
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case 4: case 5: case 6: case 7:
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#ifdef CONFIG_MIPS32_O32
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if (test_thread_flag(TIF_32BIT_REGS))
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return get_user(*arg, (int *)usp + 4 * n);
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else
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#endif
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*arg = regs->regs[4 + n];
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return 0;
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#endif
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default:
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BUG();
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}
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}
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static inline void syscall_get_arguments(struct task_struct *task,
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struct pt_regs *regs,
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unsigned int i, unsigned int n,
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unsigned long *args)
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{
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unsigned long arg;
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int ret;
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while (n--)
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ret |= mips_get_syscall_arg(&arg, task, regs, i++);
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/*
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* No way to communicate an error because this is a void function.
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*/
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#if 0
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return ret;
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#endif
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}
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extern const unsigned long sys_call_table[];
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extern const unsigned long sys32_call_table[];
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extern const unsigned long sysn32_call_table[];
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