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Remove some redundant register loads.

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Discussed on:		arm@
This commit is contained in:
Tim Kientzle 2012-05-02 05:49:58 +00:00
parent 23ec80a3da
commit e56440a696
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=234908
1 changed files with 2 additions and 9 deletions
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11
sys/boot/arm/uboot/start.S
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@ -49,27 +49,20 @@ _start:
* syscall()
*/
ENTRY(syscall)
/* Save caller's lr */
/* Save caller's lr and r8 */
ldr ip, =saved_regs
str lr, [ip, #4]
/* Save loader's r8 */
ldr ip, =saved_regs
str r8, [ip, #8]
/* Restore U-Boot's r8 */
ldr ip, =saved_regs
ldr r8, [ip, #0]
/* Call into U-Boot */
ldr lr, =return_from_syscall
ldr ip, =syscall_ptr
ldr pc, [ip]
return_from_syscall:
/* Restore loader's r8 */
/* Restore loader's r8 and lr */
ldr ip, =saved_regs
ldr r8, [ip, #8]
/* Restore caller's lr */
ldr ip, =saved_regs
ldr lr, [ip, #4]
/* Return to caller */
mov pc, lr