[PATCH v3 10/41] powerpc/32: Handle bookE debugging in C in exception entry
From: Christophe Leroy <hidden>
Date: 2021-03-12 12:51:16
Also in:
lkml
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Michael Ellerman, Linus Torvalds
The handling of SPRN_DBCR0 and other registers can easily be done in C instead of ASM. Signed-off-by: Christophe Leroy <redacted> --- arch/powerpc/include/asm/interrupt.h | 2 ++ arch/powerpc/kernel/entry_32.S | 23 ----------------------- 2 files changed, 2 insertions(+), 23 deletions(-)
diff --git a/arch/powerpc/include/asm/interrupt.h b/arch/powerpc/include/asm/interrupt.h
index c35368adbe71..861e6eadc98c 100644
--- a/arch/powerpc/include/asm/interrupt.h
+++ b/arch/powerpc/include/asm/interrupt.h@@ -65,6 +65,8 @@ static inline void interrupt_enter_prepare(struct pt_regs *regs, struct interrup if (user_mode(regs)) account_cpu_user_entry(); #endif + + booke_restore_dbcr0(); } /*
diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S
index 0f3f1bdd909e..4ffbcf3df72e 100644
--- a/arch/powerpc/kernel/entry_32.S
+++ b/arch/powerpc/kernel/entry_32.S@@ -146,32 +146,9 @@ transfer_to_handler: addi r2, r12, -THREAD addi r11,r1,STACK_FRAME_OVERHEAD stw r11,PT_REGS(r12) -#if defined(CONFIG_40x) || defined(CONFIG_BOOKE) - /* Check to see if the dbcr0 register is set up to debug. Use the - internal debug mode bit to do this. */ - lwz r12,THREAD_DBCR0(r12) - andis. r12,r12,DBCR0_IDM@h -#endif #ifdef CONFIG_PPC_BOOK3S_32 kuep_lock r11, r12 #endif -#if defined(CONFIG_40x) || defined(CONFIG_BOOKE) - beq+ 3f - /* From user and task is ptraced - load up global dbcr0 */ - li r12,-1 /* clear all pending debug events */ - mtspr SPRN_DBSR,r12 - lis r11,global_dbcr0@ha - tophys_novmstack r11,r11 - addi r11,r11,global_dbcr0@l -#ifdef CONFIG_SMP - lwz r9,TASK_CPU(r2) - slwi r9,r9,2 - add r11,r11,r9 -#endif - lwz r12,0(r11) - mtspr SPRN_DBCR0,r12 -#endif - b 3f 2: /* if from kernel, check interrupted DOZE/NAP mode and
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2.25.0