Save non volatile registers, XER, CTR, MSR and NIP in exception prolog.
Also assign proper value to r2 and r3 there.
For now, recalculate thread pointer in prepare_transfer_to_handler.
It will disappear once KUAP is ported to C.
And remove the comment which is now completely wrong.
Signed-off-by: Christophe Leroy <christophe.le...@csgroup.eu>
---
arch/powerpc/kernel/entry_32.S | 25 +++----------------------
arch/powerpc/kernel/head_32.h | 12 ++++++++++++
2 files changed, 15 insertions(+), 22 deletions(-)
diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S
index 289f111a5ac7..8fe1c3fdfa6e 100644
--- a/arch/powerpc/kernel/entry_32.S
+++ b/arch/powerpc/kernel/entry_32.S
@@ -48,29 +48,11 @@
*/
.align 12
-/*
- * This code finishes saving the registers to the exception frame
- * and jumps to the appropriate handler for the exception, turning
- * on address translation.
- * Note that we rely on the caller having set cr0.eq iff the exception
- * occurred in kernel mode (i.e. MSR:PR = 0).
- */
.globl prepare_transfer_to_handler
prepare_transfer_to_handler:
- SAVE_NVGPRS(r11)
- addi r3,r1,STACK_FRAME_OVERHEAD
- stw r2,GPR2(r11)
- stw r12,_NIP(r11)
- stw r9,_MSR(r11)
- andi. r2,r9,MSR_PR
- mfctr r12
- mfspr r2,SPRN_XER
- stw r12,_CTR(r11)
- stw r2,_XER(r11)
- mfspr r12,SPRN_SPRG_THREAD
- tovirt(r12, r12)
+ andi. r0,r9,MSR_PR
+ addi r12, r2, THREAD
beq 2f /* if from user, fix up THREAD.regs */
- addi r2, r12, -THREAD
stw r3,PT_REGS(r12)
#ifdef CONFIG_PPC_BOOK3S_32
kuep_lock r11, r12
@@ -79,8 +61,7 @@ prepare_transfer_to_handler:
/* if from kernel, check interrupted DOZE/NAP mode */
2:
- kuap_save_and_lock r11, r12, r9, r2, r6
- addi r2, r12, -THREAD
+ kuap_save_and_lock r11, r12, r9, r5, r6
#if defined(CONFIG_PPC_BOOK3S_32) || defined(CONFIG_E500)
lwz r12,TI_LOCAL_FLAGS(r2)
mtcrf 0x01,r12
diff --git a/arch/powerpc/kernel/head_32.h b/arch/powerpc/kernel/head_32.h
index ba20bfabdf63..267479072495 100644
--- a/arch/powerpc/kernel/head_32.h
+++ b/arch/powerpc/kernel/head_32.h
@@ -117,6 +117,18 @@ _ASM_NOKPROBE_SYMBOL(\name\()_virt)
stw r10,_TRAP(r1)
SAVE_4GPRS(3, r1)
SAVE_2GPRS(7, r1)
+ SAVE_NVGPRS(r1)
+ stw r2,GPR2(r1)
+ stw r12,_NIP(r1)
+ stw r9,_MSR(r1)
+ mfctr r0
+ mfspr r10,SPRN_XER
+ mfspr r2,SPRN_SPRG_THREAD
+ stw r0,_CTR(r1)
+ tovirt(r2, r2)
+ stw r10,_XER(r1)
+ addi r2, r2, -THREAD
+ addi r3,r1,STACK_FRAME_OVERHEAD
.endm
.macro prepare_transfer_to_handler
--
2.25.0
