[IA64] utrace Convert compat ptrace to use compat_sys_ptrace

Convert IA64 32-bit ptrace to use compat_sys_ptrace.

Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

2 files changed, 82 insertions, 9 deletions

diff --git a/arch/ia64/include/asm/ptrace.h b/arch/ia64/include/asm/ptrace.h
index 14055c636adf..6417c1ecb44e 100644
--- a/arch/ia64/include/asm/ptrace.h
+++ b/arch/ia64/include/asm/ptrace.h
@@ -325,6 +325,8 @@ static inline unsigned long user_stack_pointer(struct pt_regs *regs)
   #define arch_has_block_step()   (1)
   extern void user_enable_block_step(struct task_struct *);
 
+#define __ARCH_WANT_COMPAT_SYS_PTRACE
+
 #endif /* !__KERNEL__ */
 
 /* pt_all_user_regs is used for PTRACE_GETREGS PTRACE_SETREGS */
diff --git a/arch/ia64/include/asm/syscall.h b/arch/ia64/include/asm/syscall.h
index 3fd4fa6c48dd..2f758a42f94b 100644
--- a/arch/ia64/include/asm/syscall.h
+++ b/arch/ia64/include/asm/syscall.h
@@ -19,24 +19,35 @@
 static inline long syscall_get_nr(struct task_struct *task,
                                   struct pt_regs *regs)
 {
-        BUG_ON(IS_IA32_PROCESS(regs));
-
         if ((long)regs->cr_ifs < 0) /* Not a syscall */
                 return -1;
+
+#ifdef CONFIG_IA32_SUPPORT
+        if (IS_IA32_PROCESS(regs))
+                return regs->r1;
+#endif
+
         return regs->r15;
 }
 
 static inline void syscall_rollback(struct task_struct *task,
                                     struct pt_regs *regs)
 {
-        BUG_ON(IS_IA32_PROCESS(regs));
+#ifdef CONFIG_IA32_SUPPORT
+        if (IS_IA32_PROCESS(regs))
+                regs->r8 = regs->r1;
+#endif
+
         /* do nothing */
 }
 
 static inline long syscall_get_error(struct task_struct *task,
                                      struct pt_regs *regs)
 {
-        BUG_ON(IS_IA32_PROCESS(regs));
+#ifdef CONFIG_IA32_SUPPORT
+        if (IS_IA32_PROCESS(regs))
+                return regs->r8;
+#endif
 
         return regs->r10 == -1 ? regs->r8:0;
 }
@@ -44,8 +55,6 @@ static inline long syscall_get_error(struct task_struct *task,
 static inline long syscall_get_return_value(struct task_struct *task,
                                             struct pt_regs *regs)
 {
-        BUG_ON(IS_IA32_PROCESS(regs));
-
         return regs->r8;
 }
 
@@ -53,7 +62,12 @@ static inline void syscall_set_return_value(struct task_struct *task,
                                             struct pt_regs *regs,
                                             int error, long val)
 {
-        BUG_ON(IS_IA32_PROCESS(regs));
+#ifdef CONFIG_IA32_SUPPORT
+        if (IS_IA32_PROCESS(regs)) {
+                regs->r8 = (long) error ? error : val;
+                return;
+        }
+#endif
 
         if (error) {
                 /* error < 0, but ia64 uses > 0 return value */
@@ -73,9 +87,39 @@ static inline void syscall_get_arguments(struct task_struct *task,
                                          unsigned int i, unsigned int n,
                                          unsigned long *args)
 {
-        BUG_ON(IS_IA32_PROCESS(regs));
         BUG_ON(i + n > 6);
 
+#ifdef CONFIG_IA32_SUPPORT
+        if (IS_IA32_PROCESS(regs)) {
+                switch (i + n) {
+                case 6:
+                        if (!n--) break;
+                        *args++ = regs->r13;
+                case 5:
+                        if (!n--) break;
+                        *args++ = regs->r15;
+                case 4:
+                        if (!n--) break;
+                        *args++ = regs->r14;
+                case 3:
+                        if (!n--) break;
+                        *args++ = regs->r10;
+                case 2:
+                        if (!n--) break;
+                        *args++ = regs->r9;
+                case 1:
+                        if (!n--) break;
+                        *args++ = regs->r11;
+                case 0:
+                        if (!n--) break;
+                default:
+                        BUG();
+                        break;
+                }
+
+                return;
+        }
+#endif
         ia64_syscall_get_set_arguments(task, regs, i, n, args, 0);
 }
 
@@ -84,9 +128,36 @@ static inline void syscall_set_arguments(struct task_struct *task,
                                          unsigned int i, unsigned int n,
                                          unsigned long *args)
 {
-        BUG_ON(IS_IA32_PROCESS(regs));
         BUG_ON(i + n > 6);
 
+#ifdef CONFIG_IA32_SUPPORT
+        if (IS_IA32_PROCESS(regs)) {
+                switch (i + n) {
+                case 6:
+                        if (!n--) break;
+                        regs->r13 = *args++;
+                case 5:
+                        if (!n--) break;
+                        regs->r15 = *args++;
+                case 4:
+                        if (!n--) break;
+                        regs->r14 = *args++;
+                case 3:
+                        if (!n--) break;
+                        regs->r10 = *args++;
+                case 2:
+                        if (!n--) break;
+                        regs->r9 = *args++;
+                case 1:
+                        if (!n--) break;
+                        regs->r11 = *args++;
+                case 0:
+                        if (!n--) break;
+                }
+
+                return;
+        }
+#endif
         ia64_syscall_get_set_arguments(task, regs, i, n, args, 1);
 }
 #endif  /* _ASM_SYSCALL_H */