[PATCH] mips: task_pt_regs()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

3 files changed, 7 insertions, 15 deletions

diff --git a/arch/mips/kernel/process.c b/arch/mips/kernel/process.c
index 0476a4dce14..aca56f4a5d5 100644
--- a/arch/mips/kernel/process.c
+++ b/arch/mips/kernel/process.c
@@ -229,9 +229,7 @@ void elf_dump_regs(elf_greg_t *gp, struct pt_regs *regs)
 
 int dump_task_regs (struct task_struct *tsk, elf_gregset_t *regs)
 {
-        struct thread_info *ti = tsk->thread_info;
-        long ksp = (unsigned long)ti + THREAD_SIZE - 32;
-        elf_dump_regs(&(*regs)[0], (struct pt_regs *) ksp - 1);
+        elf_dump_regs(*regs, task_pt_regs(tsk));
         return 1;
 }
 
diff --git a/arch/mips/kernel/ptrace.c b/arch/mips/kernel/ptrace.c
index 8d254933530..6c358b33316 100644
--- a/arch/mips/kernel/ptrace.c
+++ b/arch/mips/kernel/ptrace.c
@@ -64,8 +64,7 @@ int ptrace_getregs (struct task_struct *child, __s64 __user *data)
         if (!access_ok(VERIFY_WRITE, data, 38 * 8))
                 return -EIO;
 
-        regs = (struct pt_regs *) ((unsigned long) child->thread_info +
-               THREAD_SIZE - 32 - sizeof(struct pt_regs));
+        regs = task_pt_regs(child);
 
         for (i = 0; i < 32; i++)
                 __put_user (regs->regs[i], data + i);
@@ -92,8 +91,7 @@ int ptrace_setregs (struct task_struct *child, __s64 __user *data)
         if (!access_ok(VERIFY_READ, data, 38 * 8))
                 return -EIO;
 
-        regs = (struct pt_regs *) ((unsigned long) child->thread_info +
-               THREAD_SIZE - 32 - sizeof(struct pt_regs));
+        regs = task_pt_regs(child);
 
         for (i = 0; i < 32; i++)
                 __get_user (regs->regs[i], data + i);
@@ -198,8 +196,7 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
                 struct pt_regs *regs;
                 unsigned long tmp = 0;
 
-                regs = (struct pt_regs *) ((unsigned long) child->thread_info +
-                       THREAD_SIZE - 32 - sizeof(struct pt_regs));
+                regs = task_pt_regs(child);
                 ret = 0;  /* Default return value. */
 
                 switch (addr) {
@@ -314,8 +311,7 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
         case PTRACE_POKEUSR: {
                 struct pt_regs *regs;
                 ret = 0;
-                regs = (struct pt_regs *) ((unsigned long) child->thread_info +
-                       THREAD_SIZE - 32 - sizeof(struct pt_regs));
+                regs = task_pt_regs(child);
 
                 switch (addr) {
                 case 0 ... 31:
diff --git a/arch/mips/kernel/ptrace32.c b/arch/mips/kernel/ptrace32.c
index 1f998bfde16..456ec438728 100644
--- a/arch/mips/kernel/ptrace32.c
+++ b/arch/mips/kernel/ptrace32.c
@@ -126,8 +126,7 @@ asmlinkage int sys32_ptrace(int request, int pid, int addr, int data)
                 struct pt_regs *regs;
                 unsigned int tmp;
 
-                regs = (struct pt_regs *) ((unsigned long) child->thread_info +
-                       THREAD_SIZE - 32 - sizeof(struct pt_regs));
+                regs = task_pt_regs(child);
                 ret = 0;  /* Default return value. */
 
                 switch (addr) {
@@ -259,8 +258,7 @@ asmlinkage int sys32_ptrace(int request, int pid, int addr, int data)
         case PTRACE_POKEUSR: {
                 struct pt_regs *regs;
                 ret = 0;
-                regs = (struct pt_regs *) ((unsigned long) child->thread_info +
-                       THREAD_SIZE - 32 - sizeof(struct pt_regs));
+                regs = task_pt_regs(child);
 
                 switch (addr) {
                 case 0 ... 31: