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[S390] Save prefix register for dump on panic

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The dump tools expect that the saved prefix register points to the
lowcore of the dump cpu. Since we set the prefix register to 0 during
reipl/dump, we have to save the original prefix register. Before we
start the dump program, we copy the original prefix register to the
designated location in the lowcore.

Signed-off-by: Michael Holzheu <holzheu@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Michael Holzheu 2006-12-15 17:18:27 +01:00 committed by Martin Schwidefsky
parent 58be944127
commit da1cf23efe
3 changed files with 13 additions and 2 deletions
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4
arch/s390/kernel/ipl.c
View file

@ -995,6 +995,7 @@ static void do_reset_calls(void)
extern void reset_mcck_handler(void);
extern void reset_pgm_handler(void);
extern __u32 dump_prefix_page;
void s390_reset_system(void)
{
@ -1005,6 +1006,9 @@ void s390_reset_system(void)
/* Stack for interrupt/machine check handler */
lc->panic_stack = S390_lowcore.panic_stack;
/* Save prefix page address for dump case */
dump_prefix_page = (unsigned long) lc;
/* Disable prefixing */
set_prefix(0);

6
arch/s390/kernel/reipl.S
View file

@ -16,7 +16,7 @@ do_reipl_asm: basr %r13,0
stm %r0,%r15,__LC_GPREGS_SAVE_AREA
stctl %c0,%c15,__LC_CREGS_SAVE_AREA
stam %a0,%a15,__LC_AREGS_SAVE_AREA
stpx __LC_PREFIX_SAVE_AREA
mvc __LC_PREFIX_SAVE_AREA(4),dump_prefix_page-.Lpg0(%r13)
stckc .Lclkcmp-.Lpg0(%r13)
mvc __LC_CLOCK_COMP_SAVE_AREA(8),.Lclkcmp-.Lpg0(%r13)
stpt __LC_CPU_TIMER_SAVE_AREA
@ -79,3 +79,7 @@ do_reipl_asm: basr %r13,0
.long 0x00000000,0x00000000
.long 0x00000000,0x00000000
.long 0x00000000,0x00000000
.globl dump_prefix_page
dump_prefix_page:
.long 0x00000000

5
arch/s390/kernel/reipl64.S
View file

@ -20,7 +20,7 @@ do_reipl_asm: basr %r13,0
stg %r0,__LC_GPREGS_SAVE_AREA-0x1000+8(%r1)
stctg %c0,%c15,__LC_CREGS_SAVE_AREA-0x1000(%r1)
stam %a0,%a15,__LC_AREGS_SAVE_AREA-0x1000(%r1)
stpx __LC_PREFIX_SAVE_AREA-0x1000(%r1)
mvc __LC_PREFIX_SAVE_AREA-0x1000(4,%r1),dump_prefix_page-.Lpg0(%r13)
stfpc __LC_FP_CREG_SAVE_AREA-0x1000(%r1)
stckc .Lclkcmp-.Lpg0(%r13)
mvc __LC_CLOCK_COMP_SAVE_AREA-0x1000(8,%r1),.Lclkcmp-.Lpg0(%r13)
@ -103,3 +103,6 @@ do_reipl_asm: basr %r13,0
.long 0x00000000,0x00000000
.long 0x00000000,0x00000000
.long 0x00000000,0x00000000
.globl dump_prefix_page
dump_prefix_page:
.long 0x00000000