[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>

diff --git a/arch/s390/kernel/reipl64.S b/arch/s390/kernel/reipl64.S
index 78eb7cfbd3d1d838ffa5a3929892aaa061f682b5..e690975403f43c9a8ac9d5dd2e8fa0ae3429722a 100644 (file)
--- a/arch/s390/kernel/reipl64.S
+++ b/arch/s390/kernel/reipl64.S
@@ -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