[POWERPC] Make setjmp/longjmp code usable outside of xmon

This makes the setjmp/longjmp code used by xmon, generically available
to other code.  It also removes the requirement for debugger hooks to
be only called on 0x300 (data storage) exception.

Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 65 insertions, 0 deletions

diff --git a/arch/powerpc/kernel/misc.S b/arch/powerpc/kernel/misc.S
index 74ce0c7a7b1e..7b9160220698 100644
--- a/arch/powerpc/kernel/misc.S
+++ b/arch/powerpc/kernel/misc.S
@@ -8,6 +8,8 @@
  * Adapted for iSeries by Mike Corrigan (mikejc@us.ibm.com)
  * PPC64 updates by Dave Engebretsen (engebret@us.ibm.com)
  *
+ * setjmp/longjmp code by Paul Mackerras.
+ *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
  * as published by the Free Software Foundation; either version
@@ -15,6 +17,8 @@
  */
 #include <asm/ppc_asm.h>
 #include <asm/unistd.h>
+#include <asm/asm-compat.h>
+#include <asm/asm-offsets.h>
 
         .text
 
@@ -51,3 +55,64 @@ _GLOBAL(kernel_execve)
         bnslr
         neg     r3,r3
         blr
+
+_GLOBAL(setjmp)
+        mflr    r0
+        PPC_STL r0,0(r3)
+        PPC_STL r1,SZL(r3)
+        PPC_STL r2,2*SZL(r3)
+        mfcr    r0
+        PPC_STL r0,3*SZL(r3)
+        PPC_STL r13,4*SZL(r3)
+        PPC_STL r14,5*SZL(r3)
+        PPC_STL r15,6*SZL(r3)
+        PPC_STL r16,7*SZL(r3)
+        PPC_STL r17,8*SZL(r3)
+        PPC_STL r18,9*SZL(r3)
+        PPC_STL r19,10*SZL(r3)
+        PPC_STL r20,11*SZL(r3)
+        PPC_STL r21,12*SZL(r3)
+        PPC_STL r22,13*SZL(r3)
+        PPC_STL r23,14*SZL(r3)
+        PPC_STL r24,15*SZL(r3)
+        PPC_STL r25,16*SZL(r3)
+        PPC_STL r26,17*SZL(r3)
+        PPC_STL r27,18*SZL(r3)
+        PPC_STL r28,19*SZL(r3)
+        PPC_STL r29,20*SZL(r3)
+        PPC_STL r30,21*SZL(r3)
+        PPC_STL r31,22*SZL(r3)
+        li      r3,0
+        blr
+
+_GLOBAL(longjmp)
+        PPC_LCMPI r4,0
+        bne     1f
+        li      r4,1
+1:      PPC_LL  r13,4*SZL(r3)
+        PPC_LL  r14,5*SZL(r3)
+        PPC_LL  r15,6*SZL(r3)
+        PPC_LL  r16,7*SZL(r3)
+        PPC_LL  r17,8*SZL(r3)
+        PPC_LL  r18,9*SZL(r3)
+        PPC_LL  r19,10*SZL(r3)
+        PPC_LL  r20,11*SZL(r3)
+        PPC_LL  r21,12*SZL(r3)
+        PPC_LL  r22,13*SZL(r3)
+        PPC_LL  r23,14*SZL(r3)
+        PPC_LL  r24,15*SZL(r3)
+        PPC_LL  r25,16*SZL(r3)
+        PPC_LL  r26,17*SZL(r3)
+        PPC_LL  r27,18*SZL(r3)
+        PPC_LL  r28,19*SZL(r3)
+        PPC_LL  r29,20*SZL(r3)
+        PPC_LL  r30,21*SZL(r3)
+        PPC_LL  r31,22*SZL(r3)
+        PPC_LL  r0,3*SZL(r3)
+        mtcrf   0x38,r0
+        PPC_LL  r0,0(r3)
+        PPC_LL  r1,SZL(r3)
+        PPC_LL  r2,2*SZL(r3)
+        mtlr    r0
+        mr      r3,r4
+        blr