summaryrefslogtreecommitdiffstats
path: root/arch/powerpc/kernel/head_booke.h
diff options
context:
space:
mode:
Diffstat (limited to 'arch/powerpc/kernel/head_booke.h')
-rw-r--r--arch/powerpc/kernel/head_booke.h42
1 files changed, 26 insertions, 16 deletions
diff --git a/arch/powerpc/kernel/head_booke.h b/arch/powerpc/kernel/head_booke.h
index a0bf158c8b47..fc921bf62e15 100644
--- a/arch/powerpc/kernel/head_booke.h
+++ b/arch/powerpc/kernel/head_booke.h
@@ -20,33 +20,43 @@
addi reg,reg,val@l
#endif
+/*
+ * Macro used to get to thread save registers.
+ * Note that entries 0-3 are used for the prolog code, and the remaining
+ * entries are available for specific exception use in the event a handler
+ * requires more than 4 scratch registers.
+ */
+#define THREAD_NORMSAVE(offset) (THREAD_NORMSAVES + (offset * 4))
+
#define NORMAL_EXCEPTION_PROLOG \
- mtspr SPRN_SPRG_WSCRATCH0,r10;/* save two registers to work with */\
- mtspr SPRN_SPRG_WSCRATCH1,r11; \
- mtspr SPRN_SPRG_WSCRATCH2,r1; \
- mfcr r10; /* save CR in r10 for now */\
+ mtspr SPRN_SPRG_WSCRATCH0, r10; /* save one register */ \
+ mfspr r10, SPRN_SPRG_THREAD; \
+ stw r11, THREAD_NORMSAVE(0)(r10); \
+ stw r13, THREAD_NORMSAVE(2)(r10); \
+ mfcr r13; /* save CR in r13 for now */\
mfspr r11,SPRN_SRR1; /* check whether user or kernel */\
andi. r11,r11,MSR_PR; \
+ mr r11, r1; \
beq 1f; \
- mfspr r1,SPRN_SPRG_THREAD; /* if from user, start at top of */\
- lwz r1,THREAD_INFO-THREAD(r1); /* this thread's kernel stack */\
- ALLOC_STACK_FRAME(r1, THREAD_SIZE); \
-1: subi r1,r1,INT_FRAME_SIZE; /* Allocate an exception frame */\
- mr r11,r1; \
- stw r10,_CCR(r11); /* save various registers */\
+ /* if from user, start at top of this thread's kernel stack */ \
+ lwz r11, THREAD_INFO-THREAD(r10); \
+ ALLOC_STACK_FRAME(r11, THREAD_SIZE); \
+1 : subi r11, r11, INT_FRAME_SIZE; /* Allocate exception frame */ \
+ stw r13, _CCR(r11); /* save various registers */ \
stw r12,GPR12(r11); \
stw r9,GPR9(r11); \
- mfspr r10,SPRN_SPRG_RSCRATCH0; \
- stw r10,GPR10(r11); \
- mfspr r12,SPRN_SPRG_RSCRATCH1; \
+ mfspr r13, SPRN_SPRG_RSCRATCH0; \
+ stw r13, GPR10(r11); \
+ lwz r12, THREAD_NORMSAVE(0)(r10); \
stw r12,GPR11(r11); \
+ lwz r13, THREAD_NORMSAVE(2)(r10); /* restore r13 */ \
mflr r10; \
stw r10,_LINK(r11); \
- mfspr r10,SPRN_SPRG_RSCRATCH2; \
mfspr r12,SPRN_SRR0; \
- stw r10,GPR1(r11); \
+ stw r1, GPR1(r11); \
mfspr r9,SPRN_SRR1; \
- stw r10,0(r11); \
+ stw r1, 0(r11); \
+ mr r1, r11; \
rlwinm r9,r9,0,14,12; /* clear MSR_WE (necessary?) */\
stw r0,GPR0(r11); \
lis r10, STACK_FRAME_REGS_MARKER@ha;/* exception frame marker */ \