1 files changed, 35 insertions, 7 deletions

diff --git a/arch/mips/include/asm/syscall.h b/arch/mips/include/asm/syscall.h
index 33e8dbfc1b63..6c488c85d791 100644
--- a/arch/mips/include/asm/syscall.h
+++ b/arch/mips/include/asm/syscall.h
@@ -13,17 +13,29 @@
 #ifndef __ASM_MIPS_SYSCALL_H
 #define __ASM_MIPS_SYSCALL_H
 
+#include <linux/compiler.h>
 #include <linux/audit.h>
 #include <linux/elf-em.h>
 #include <linux/kernel.h>
 #include <linux/sched.h>
 #include <linux/uaccess.h>
 #include <asm/ptrace.h>
+#include <asm/unistd.h>
+
+#ifndef __NR_syscall /* Only defined if _MIPS_SIM == _MIPS_SIM_ABI32 */
+#define __NR_syscall 4000
+#endif
 
 static inline long syscall_get_nr(struct task_struct *task,
 				  struct pt_regs *regs)
 {
-	return regs->regs[2];
+	/* O32 ABI syscall() - Either 64-bit with O32 or 32-bit */
+	if ((config_enabled(CONFIG_32BIT) ||
+	    test_tsk_thread_flag(task, TIF_32BIT_REGS)) &&
+	    (regs->regs[2] == __NR_syscall))
+		return regs->regs[4];
+	else
+		return regs->regs[2];
 }
 
 static inline unsigned long mips_get_syscall_arg(unsigned long *arg,
@@ -39,14 +51,14 @@ static inline unsigned long mips_get_syscall_arg(unsigned long *arg,
 
 #ifdef CONFIG_32BIT
 	case 4: case 5: case 6: case 7:
-		return get_user(*arg, (int *)usp + 4 * n);
+		return get_user(*arg, (int *)usp + 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);
+			return get_user(*arg, (int *)usp + n);
 		else
 #endif
 			*arg = regs->regs[4 + n];
@@ -57,6 +69,8 @@ static inline unsigned long mips_get_syscall_arg(unsigned long *arg,
 	default:
 		BUG();
 	}
+
+	unreachable();
 }
 
 static inline long syscall_get_return_value(struct task_struct *task,
@@ -65,6 +79,12 @@ static inline long syscall_get_return_value(struct task_struct *task,
 	return regs->regs[2];
 }
 
+static inline void syscall_rollback(struct task_struct *task,
+				    struct pt_regs *regs)
+{
+	/* Do nothing */
+}
+
 static inline void syscall_set_return_value(struct task_struct *task,
 					    struct pt_regs *regs,
 					    int error, long val)
@@ -83,11 +103,17 @@ static inline void syscall_get_arguments(struct task_struct *task,
 					 unsigned int i, unsigned int n,
 					 unsigned long *args)
 {
-	unsigned long arg;
 	int ret;
+	/* O32 ABI syscall() - Either 64-bit with O32 or 32-bit */
+	if ((config_enabled(CONFIG_32BIT) ||
+	    test_tsk_thread_flag(task, TIF_32BIT_REGS)) &&
+	    (regs->regs[2] == __NR_syscall)) {
+		i++;
+		n++;
+	}
 
 	while (n--)
-		ret |= mips_get_syscall_arg(&arg, task, regs, i++);
+		ret |= mips_get_syscall_arg(args++, task, regs, i++);
 
 	/*
 	 * No way to communicate an error because this is a void function.
@@ -101,11 +127,13 @@ extern const unsigned long sys_call_table[];
 extern const unsigned long sys32_call_table[];
 extern const unsigned long sysn32_call_table[];
 
-static inline int __syscall_get_arch(void)
+static inline int syscall_get_arch(struct task_struct *task,
+				   struct pt_regs *regs)
 {
 	int arch = EM_MIPS;
 #ifdef CONFIG_64BIT
-	arch |=  __AUDIT_ARCH_64BIT;
+	if (!test_tsk_thread_flag(task, TIF_32BIT_REGS))
+		arch |= __AUDIT_ARCH_64BIT;
 #endif
 #if defined(__LITTLE_ENDIAN)
 	arch |=  __AUDIT_ARCH_LE;