[POWERPC] 40x/Book-E: Save/restore volatile exception registers

[pandora-kernel.git] / arch / powerpc / kernel / head_booke.h

diff --git a/arch/powerpc/kernel/head_booke.h b/arch/powerpc/kernel/head_booke.h
index b0874d2..f277fad 100644 (file)
--- a/arch/powerpc/kernel/head_booke.h
+++ b/arch/powerpc/kernel/head_booke.h
@@ -72,7 +72,7 @@
 #define DEBUG_STACK_BASE       dbgirq_ctx
 #define DEBUG_SPRG             SPRN_SPRG6W
 
-#define EXC_LVL_FRAME_OVERHEAD (THREAD_SIZE - INT_FRAME_SIZE)
+#define EXC_LVL_FRAME_OVERHEAD (THREAD_SIZE - INT_FRAME_SIZE - EXC_LVL_SIZE)
 
 #ifdef CONFIG_SMP
 #define BOOKE_LOAD_EXC_LEVEL_STACK(level)              \
@@ -376,4 +376,25 @@ label:
        addi    r3,r1,STACK_FRAME_OVERHEAD;                                   \
        EXC_XFER_EE_LITE(0x800, kernel_fp_unavailable_exception)
 
+#ifndef __ASSEMBLY__
+struct exception_regs {
+       unsigned long mas0;
+       unsigned long mas1;
+       unsigned long mas2;
+       unsigned long mas3;
+       unsigned long mas6;
+       unsigned long mas7;
+       unsigned long srr0;
+       unsigned long srr1;
+       unsigned long csrr0;
+       unsigned long csrr1;
+       unsigned long dsrr0;
+       unsigned long dsrr1;
+       unsigned long saved_ksp_limit;
+};
+
+/* ensure this structure is always sized to a multiple of the stack alignment */
+#define STACK_EXC_LVL_FRAME_SIZE       _ALIGN_UP(sizeof (struct exception_regs), 16)
+
+#endif /* __ASSEMBLY__ */
 #endif /* __HEAD_BOOKE_H__ */