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[S390] Export store_status() function 

For kdump we need a store status function to save the registers for the
current CPU. Therefore this patch exports a function "store_status()".
In addition to that now also floating point registers are saved correctly.

Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
This commit is contained in:
Michael Holzheu 2011-08-03 16:44:21 +02:00 committed by Heiko Carstens
parent e4258d55bf
commit ef1daec8da
1 changed files with 60 additions and 20 deletions
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80
arch/s390/kernel/reipl64.S
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@ -1,5 +1,5 @@
/*
* Copyright IBM Corp 2000,2009
* Copyright IBM Corp 2000,2011
* Author(s): Holger Smolinski <Holger.Smolinski@de.ibm.com>,
* Denis Joseph Barrow,
*/
@ -7,6 +7,64 @@
#include <linux/linkage.h>
#include <asm/asm-offsets.h>
#
# store_status
#
# Prerequisites to run this function:
# - Prefix register is set to zero
# - Original prefix register is stored in "dump_prefix_page"
# - Lowcore protection is off
#
ENTRY(store_status)
/* Save register one and load save area base */
stg %r1,__LC_SAVE_AREA_64(%r0)
lghi %r1,SAVE_AREA_BASE
/* General purpose registers */
stmg %r0,%r15,__LC_GPREGS_SAVE_AREA-SAVE_AREA_BASE(%r1)
lg %r2,__LC_SAVE_AREA_64(%r0)
stg %r2,__LC_GPREGS_SAVE_AREA-SAVE_AREA_BASE+8(%r1)
/* Control registers */
stctg %c0,%c15,__LC_CREGS_SAVE_AREA-SAVE_AREA_BASE(%r1)
/* Access registers */
stam %a0,%a15,__LC_AREGS_SAVE_AREA-SAVE_AREA_BASE(%r1)
/* Floating point registers */
std %f0, 0x00 + __LC_FPREGS_SAVE_AREA-SAVE_AREA_BASE(%r1)
std %f1, 0x08 + __LC_FPREGS_SAVE_AREA-SAVE_AREA_BASE(%r1)
std %f2, 0x10 + __LC_FPREGS_SAVE_AREA-SAVE_AREA_BASE(%r1)
std %f3, 0x18 + __LC_FPREGS_SAVE_AREA-SAVE_AREA_BASE(%r1)
std %f4, 0x20 + __LC_FPREGS_SAVE_AREA-SAVE_AREA_BASE(%r1)
std %f5, 0x28 + __LC_FPREGS_SAVE_AREA-SAVE_AREA_BASE(%r1)
std %f6, 0x30 + __LC_FPREGS_SAVE_AREA-SAVE_AREA_BASE(%r1)
std %f7, 0x38 + __LC_FPREGS_SAVE_AREA-SAVE_AREA_BASE(%r1)
std %f8, 0x40 + __LC_FPREGS_SAVE_AREA-SAVE_AREA_BASE(%r1)
std %f9, 0x48 + __LC_FPREGS_SAVE_AREA-SAVE_AREA_BASE(%r1)
std %f10,0x50 + __LC_FPREGS_SAVE_AREA-SAVE_AREA_BASE(%r1)
std %f11,0x58 + __LC_FPREGS_SAVE_AREA-SAVE_AREA_BASE(%r1)
std %f12,0x60 + __LC_FPREGS_SAVE_AREA-SAVE_AREA_BASE(%r1)
std %f13,0x68 + __LC_FPREGS_SAVE_AREA-SAVE_AREA_BASE(%r1)
std %f14,0x70 + __LC_FPREGS_SAVE_AREA-SAVE_AREA_BASE(%r1)
std %f15,0x78 + __LC_FPREGS_SAVE_AREA-SAVE_AREA_BASE(%r1)
/* Floating point control register */
stfpc __LC_FP_CREG_SAVE_AREA-SAVE_AREA_BASE(%r1)
/* CPU timer */
stpt __LC_CPU_TIMER_SAVE_AREA-SAVE_AREA_BASE(%r1)
/* Saved prefix register */
larl %r2,dump_prefix_page
mvc __LC_PREFIX_SAVE_AREA-SAVE_AREA_BASE(4,%r1),0(%r2)
/* Clock comparator - seven bytes */
larl %r2,.Lclkcmp
stckc 0(%r2)
mvc __LC_CLOCK_COMP_SAVE_AREA-SAVE_AREA_BASE + 1(7,%r1),1(%r2)
/* Program status word */
epsw %r2,%r3
st %r2,__LC_PSW_SAVE_AREA-SAVE_AREA_BASE + 0(%r1)
st %r3,__LC_PSW_SAVE_AREA-SAVE_AREA_BASE + 4(%r1)
larl %r2,store_status
stg %r2,__LC_PSW_SAVE_AREA-SAVE_AREA_BASE + 8(%r1)
br %r14
.align 8
.Lclkcmp: .quad 0x0000000000000000
#
# do_reipl_asm
# Parameter: r2 = schid of reipl device
@ -15,22 +73,7 @@
ENTRY(do_reipl_asm)
basr %r13,0
.Lpg0: lpswe .Lnewpsw-.Lpg0(%r13)
.Lpg1: # do store status of all registers
stg %r1,.Lregsave-.Lpg0(%r13)
lghi %r1,0x1000
stmg %r0,%r15,__LC_GPREGS_SAVE_AREA-0x1000(%r1)
lg %r0,.Lregsave-.Lpg0(%r13)
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)
lg %r10,.Ldump_pfx-.Lpg0(%r13)
mvc __LC_PREFIX_SAVE_AREA-0x1000(4,%r1),0(%r10)
stfpc __LC_FP_CREG_SAVE_AREA-0x1000(%r1)
stckc .Lclkcmp-.Lpg0(%r13)
mvc __LC_CLOCK_COMP_SAVE_AREA-0x1000(7,%r1),.Lclkcmp-.Lpg0(%r13)
stpt __LC_CPU_TIMER_SAVE_AREA-0x1000(%r1)
stg %r13, __LC_PSW_SAVE_AREA-0x1000+8(%r1)
.Lpg1: brasl %r14,store_status
lctlg %c6,%c6,.Lall-.Lpg0(%r13)
lgr %r1,%r2
@ -67,10 +110,7 @@ ENTRY(do_reipl_asm)
st %r14,.Ldispsw+12-.Lpg0(%r13)
lpswe .Ldispsw-.Lpg0(%r13)
.align 8
.Lclkcmp: .quad 0x0000000000000000
.Lall: .quad 0x00000000ff000000
.Ldump_pfx: .quad dump_prefix_page
.Lregsave: .quad 0x0000000000000000
.align 16
/*
* These addresses have to be 31 bit otherwise