In preparation of handling exception entry and exit in C,
in order to simplify the handling, always save non volatile registers
when entering an exception.
Signed-off-by: Christophe Leroy <christophe.le...@csgroup.eu>
---
arch/powerpc/include/asm/ptrace.h | 6 ++----
arch/powerpc/kernel/entry_32.S | 13 +------------
arch/powerpc/kernel/head_32.h | 3 +--
arch/powerpc/kernel/head_booke.h | 2 +-
4 files changed, 5 insertions(+), 19 deletions(-)
diff --git a/arch/powerpc/include/asm/ptrace.h
b/arch/powerpc/include/asm/ptrace.h
index 975ba260006a..0a5d8c6b13c4 100644
--- a/arch/powerpc/include/asm/ptrace.h
+++ b/arch/powerpc/include/asm/ptrace.h
@@ -209,16 +209,14 @@ static inline void regs_set_return_value(struct pt_regs
*regs, unsigned long rc)
*/
#define TRAP_FLAGS_MASK 0x1F
#define TRAP(regs) ((regs)->trap & ~TRAP_FLAGS_MASK)
-#define FULL_REGS(regs) (((regs)->trap & 1) == 0)
-#define SET_FULL_REGS(regs) ((regs)->trap |= 1)
+#define FULL_REGS(regs) true
+#define SET_FULL_REGS(regs) do { } while (0)
#define IS_CRITICAL_EXC(regs) (((regs)->trap & 2) != 0)
#define IS_MCHECK_EXC(regs) (((regs)->trap & 4) != 0)
#define IS_DEBUG_EXC(regs) (((regs)->trap & 8) != 0)
#define NV_REG_POISON 0xdeadbeef
#define CHECK_FULL_REGS(regs) \
do { \
- if ((regs)->trap & 1) \
- printk(KERN_CRIT "%s: partial register set\n", __func__); \
} while (0)
#endif /* __powerpc64__ */
diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S
index fb849ef922fb..7084289994b3 100644
--- a/arch/powerpc/kernel/entry_32.S
+++ b/arch/powerpc/kernel/entry_32.S
@@ -81,12 +81,12 @@ _ASM_NOKPROBE_SYMBOL(crit_transfer_to_handler)
*/
.globl transfer_to_handler_full
transfer_to_handler_full:
- SAVE_NVGPRS(r11)
_ASM_NOKPROBE_SYMBOL(transfer_to_handler_full)
/* fall through */
.globl transfer_to_handler
transfer_to_handler:
+ SAVE_NVGPRS(r11)
stw r2,GPR2(r11)
stw r12,_NIP(r11)
stw r9,_MSR(r11)
@@ -234,10 +234,6 @@ handle_page_fault:
bl do_page_fault
cmpwi r3,0
beq+ ret_from_except
- SAVE_NVGPRS(r1)
- lwz r0,_TRAP(r1)
- clrrwi r0,r0,1
- stw r0,_TRAP(r1)
mr r4,r3 /* err arg for bad_page_fault */
addi r3,r1,STACK_FRAME_OVERHEAD
bl __bad_page_fault
@@ -810,13 +806,6 @@ recheck:
do_user_signal: /* r10 contains MSR_KERNEL here */
ori r10,r10,MSR_EE
mtmsr r10 /* hard-enable interrupts */
- /* save r13-r31 in the exception frame, if not already done */
- lwz r3,_TRAP(r1)
- andi. r0,r3,1
- beq 2f
- SAVE_NVGPRS(r1)
- rlwinm r3,r3,0,0,30
- stw r3,_TRAP(r1)
2: addi r3,r1,STACK_FRAME_OVERHEAD
mr r4,r9
bl do_notify_resume
diff --git a/arch/powerpc/kernel/head_32.h b/arch/powerpc/kernel/head_32.h
index e09585b88ba7..087445e45489 100644
--- a/arch/powerpc/kernel/head_32.h
+++ b/arch/powerpc/kernel/head_32.h
@@ -198,7 +198,7 @@ _ASM_NOKPROBE_SYMBOL(\name\()_virt)
ret_from_except_full)
#define EXC_XFER_LITE(n, hdlr) \
- EXC_XFER_TEMPLATE(hdlr, n+1, MSR_KERNEL, transfer_to_handler, \
+ EXC_XFER_TEMPLATE(hdlr, n, MSR_KERNEL, transfer_to_handler, \
ret_from_except)
.macro vmap_stack_overflow_exception
@@ -215,7 +215,6 @@ _ASM_NOKPROBE_SYMBOL(\name\()_virt)
lwz r1, emergency_ctx@l(r1)
addi r1, r1, THREAD_SIZE - INT_FRAME_SIZE
EXCEPTION_PROLOG_2 vmap_stack_overflow
- SAVE_NVGPRS(r11)
addi r3, r1, STACK_FRAME_OVERHEAD
EXC_XFER_STD(0, stack_overflow_exception)
.endm
diff --git a/arch/powerpc/kernel/head_booke.h b/arch/powerpc/kernel/head_booke.h
index 3707f49f0b78..b31bf9e833c0 100644
--- a/arch/powerpc/kernel/head_booke.h
+++ b/arch/powerpc/kernel/head_booke.h
@@ -331,7 +331,7 @@ ALT_FTR_SECTION_END_IFSET(CPU_FTR_EMB_HV)
ret_from_except_full)
#define EXC_XFER_LITE(n, hdlr) \
- EXC_XFER_TEMPLATE(hdlr, n+1, MSR_KERNEL, transfer_to_handler, \
+ EXC_XFER_TEMPLATE(hdlr, n, MSR_KERNEL, transfer_to_handler, \
ret_from_except)
/* Check for a single step debug exception while in an exception
--
2.25.0
