[PATCH v6 02/16] linux-user/host/ppc64: Use r11 for signal_pending address

[Richard Henderson]

We don't need a register that can live across the syscall;
we only need a register that can live until the syscall.
Use call-clobbered r11 instead of call-saved r14.
Eliminate the save and restore of r14 from the stack frame.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 linux-user/host/ppc64/safe-syscall.inc.S | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/linux-user/host/ppc64/safe-syscall.inc.S 
b/linux-user/host/ppc64/safe-syscall.inc.S
index 4b57440585..5f19cd193c 100644
--- a/linux-user/host/ppc64/safe-syscall.inc.S
+++ b/linux-user/host/ppc64/safe-syscall.inc.S
@@ -49,9 +49,7 @@ safe_syscall_base:
          *               and returns the result in r3
          * Shuffle everything around appropriately.
          */
-        std     14, 16(1) /* Preserve r14 in SP+16 */
-        .cfi_offset 14, 16
-        mr      14, 3   /* signal_pending */
+        mr      11, 3   /* signal_pending */
         mr      0, 4    /* syscall number */
         mr      3, 5    /* syscall arguments */
         mr      4, 6
@@ -69,13 +67,12 @@ safe_syscall_base:
          */
 safe_syscall_start:
         /* if signal_pending is non-zero, don't do the call */
-        lwz     12, 0(14)
+        lwz     12, 0(11)
         cmpwi   0, 12, 0
         bne-    0f
         sc
 safe_syscall_end:
         /* code path when we did execute the syscall */
-        ld 14, 16(1) /* restore r14 to its original value */
         bnslr+
 
         /* syscall failed; return negative errno */
@@ -84,7 +81,6 @@ safe_syscall_end:
 
         /* code path when we didn't execute the syscall */
 0:      addi    3, 0, -TARGET_ERESTARTSYS
-        ld 14, 16(1) /* restore r14 to its original value */
         blr
         .cfi_endproc
 
-- 
2.25.1