[S390] reipl: move dump_prefix_page out of text section.

Reipl doesn't work on older machines were s390_reset_machine() gets
called. The reason is that the text section is read-only but the
variable dump_prefix_page is there. Since s390_reset_machine() writes
to it we get a protection exception.
Therefore move dump_prefix_page to the bss section.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 9 insertions, 4 deletions

diff --git a/arch/s390/kernel/reipl64.S b/arch/s390/kernel/reipl64.S
index dbb3eed38865..c41930499a5f 100644
--- a/arch/s390/kernel/reipl64.S
+++ b/arch/s390/kernel/reipl64.S
@@ -8,6 +8,12 @@
  */
 
 #include <asm/lowcore.h>
+
+#
+# do_reipl_asm
+# Parameter: r2 = schid of reipl device
+#
+
                 .globl  do_reipl_asm
 do_reipl_asm:   basr    %r13,0
 .Lpg0:          lpswe   .Lnewpsw-.Lpg0(%r13)
@@ -20,7 +26,8 @@ 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)
-                mvc     __LC_PREFIX_SAVE_AREA-0x1000(4,%r1),dump_prefix_page-.Lpg0(%r13)
+                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(8,%r1),.Lclkcmp-.Lpg0(%r13)
@@ -64,6 +71,7 @@ do_reipl_asm:	basr	%r13,0
                 .align  8
 .Lclkcmp:       .quad   0x0000000000000000
 .Lall:          .quad   0x00000000ff000000
+.Ldump_pfx:     .quad   dump_prefix_page
 .Lregsave:      .quad   0x0000000000000000
                 .align  16
 /*
@@ -103,6 +111,3 @@ do_reipl_asm:	basr	%r13,0
                 .long   0x00000000,0x00000000
                 .long   0x00000000,0x00000000
                 .long   0x00000000,0x00000000
-        .globl dump_prefix_page
-dump_prefix_page:
-        .long 0x00000000