arm64: take fetching compat reg out of pt_regs into a new helper

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/arch/arm64/kernel/ptrace.c b/arch/arm64/kernel/ptrace.c
index 68b7f34a08f547e6a4b144613fe22f9cc2ba33f1..5b837741ab769e715e37bff6dda0638fdc31a699 100644 (file)
--- a/arch/arm64/kernel/ptrace.c
+++ b/arch/arm64/kernel/ptrace.c
@@ -1237,6 +1237,22 @@ enum compat_regset {
        REGSET_COMPAT_VFP,
 };
 
+static inline compat_ulong_t compat_get_user_reg(struct task_struct *task, int idx)
+{
+       struct pt_regs *regs = task_pt_regs(task);
+
+       switch (idx) {
+       case 15:
+               return regs->pc;
+       case 16:
+               return pstate_to_compat_psr(regs->pstate);
+       case 17:
+               return regs->orig_x0;
+       default:
+               return regs->regs[idx];
+       }
+}
+
 static int compat_gpr_get(struct task_struct *target,
                          const struct user_regset *regset,
                          unsigned int pos, unsigned int count,
@@ -1255,23 +1271,7 @@ static int compat_gpr_get(struct task_struct *target,
                return -EIO;
 
        for (i = 0; i < num_regs; ++i) {
-               unsigned int idx = start + i;
-               compat_ulong_t reg;
-
-               switch (idx) {
-               case 15:
-                       reg = task_pt_regs(target)->pc;
-                       break;
-               case 16:
-                       reg = task_pt_regs(target)->pstate;
-                       reg = pstate_to_compat_psr(reg);
-                       break;
-               case 17:
-                       reg = task_pt_regs(target)->orig_x0;
-                       break;
-               default:
-                       reg = task_pt_regs(target)->regs[idx];
-               }
+               compat_ulong_t reg = compat_get_user_reg(target, start + i);
 
                if (kbuf) {
                        memcpy(kbuf, &reg, sizeof(reg));