forked from luck/tmp_suning_uos_patched
034e9e966c
After the execution has been switched to the destination CPU, the target function is called with the wrong parameter. According to the C calling convention on s390, the first parameter should be loaded into register 2. Currently in smp_restart_cpu() it is stored in register 3. To fix this, we load the parameter into the correct register 2. Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
54 lines
1.2 KiB
ArmAsm
54 lines
1.2 KiB
ArmAsm
/*
|
|
* 64-bit switch cpu code
|
|
*
|
|
* Copyright IBM Corp. 2009
|
|
*
|
|
*/
|
|
|
|
#include <asm/asm-offsets.h>
|
|
#include <asm/ptrace.h>
|
|
|
|
# smp_switch_to_cpu switches to destination cpu and executes the passed function
|
|
# Parameter: %r2 - function to call
|
|
# %r3 - function parameter
|
|
# %r4 - stack poiner
|
|
# %r5 - current cpu
|
|
# %r6 - destination cpu
|
|
|
|
.section .text
|
|
.align 4
|
|
.globl smp_switch_to_cpu
|
|
smp_switch_to_cpu:
|
|
stmg %r6,%r15,__SF_GPRS(%r15)
|
|
lgr %r1,%r15
|
|
aghi %r15,-STACK_FRAME_OVERHEAD
|
|
stg %r1,__SF_BACKCHAIN(%r15)
|
|
larl %r1,.gprregs
|
|
stmg %r0,%r15,0(%r1)
|
|
1: sigp %r0,%r6,__SIGP_RESTART /* start destination CPU */
|
|
brc 2,1b /* busy, try again */
|
|
2: sigp %r0,%r5,__SIGP_STOP /* stop current CPU */
|
|
brc 2,2b /* busy, try again */
|
|
3: j 3b
|
|
|
|
.globl smp_restart_cpu
|
|
smp_restart_cpu:
|
|
larl %r1,.gprregs
|
|
lmg %r0,%r15,0(%r1)
|
|
1: sigp %r0,%r5,__SIGP_SENSE /* Wait for calling CPU */
|
|
brc 10,1b /* busy, accepted (status 0), running */
|
|
tmll %r0,0x40 /* Test if calling CPU is stopped */
|
|
jz 1b
|
|
ltgr %r4,%r4 /* New stack ? */
|
|
jz 1f
|
|
lgr %r15,%r4
|
|
1: lgr %r14,%r2 /* r14: Function to call */
|
|
lgr %r2,%r3 /* r2 : Parameter for function*/
|
|
basr %r14,%r14 /* Call function */
|
|
|
|
.section .data,"aw",@progbits
|
|
.gprregs:
|
|
.rept 16
|
|
.quad 0
|
|
.endr
|