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authorRalf Baechle <ralf@linux-mips.org>2012-08-17 08:22:04 +0200
committerRalf Baechle <ralf@linux-mips.org>2013-10-29 21:25:11 +0100
commitc0ff3c53d4f99f5e0ac5fc30ad77f26159b347e0 (patch)
treeace67e4403900863e8532068c9caa120aa726d0a /arch/mips/include
parent6a9c001b7ec3ae6639f97a5b7ea4b0ea35053b18 (diff)
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>
Diffstat (limited to 'arch/mips/include')
-rw-r--r--arch/mips/include/asm/ptrace.h14
-rw-r--r--arch/mips/include/asm/syscall.h67
2 files changed, 80 insertions, 1 deletions
diff --git a/arch/mips/include/asm/ptrace.h b/arch/mips/include/asm/ptrace.h
index 5e6cd0947393..7bba9da110af 100644
--- a/arch/mips/include/asm/ptrace.h
+++ b/arch/mips/include/asm/ptrace.h
@@ -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 */
diff --git a/arch/mips/include/asm/syscall.h b/arch/mips/include/asm/syscall.h
index ab5effdc935d..00f2ffaaf293 100644
--- a/arch/mips/include/asm/syscall.h
+++ b/arch/mips/include/asm/syscall.h
@@ -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[];