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ppc: Create a stack frame for wait_ticks()

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wait_ticks() calls get_ticks() without building a back chain which
makes gdb unhappy when doing back trace. This can also cause
improper memory accesses.

Signed-off-by: Joakim Tjernlund <Joakim.Tjernlund@transmode.se>
This commit is contained in:
Joakim Tjernlund 2012-07-16 21:25:40 +00:00 committed by Wolfgang Denk
parent 64a08a9ffc
commit 83f83d1935
1 changed files with 5 additions and 2 deletions
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7
arch/powerpc/lib/ticks.S
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@ -47,7 +47,9 @@ get_ticks:
*/
.globl wait_ticks
wait_ticks:
mflr r8 /* save link register */
stwu r1, -16(r1)
mflr r0 /* save link register */
stw r0, 20(r1) /* Use r0 or GDB will be unhappy */
mr r7, r3 /* save tick count */
bl get_ticks /* Get start time */
@ -61,5 +63,6 @@ wait_ticks:
subfe. r3, r3, r6
bge 1b /* Loop until time expired */
mtlr r8 /* restore link register */
mtlr r0 /* restore link register */
addi r1,r1,16
blr