powerpc/32s: Enhance readability of trap types

This patch makes use of trap types in head_book3s_32.S
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/bd80ace67757f489fc4ecdb76dd1a71511daba94.1618847273.git.christophe.leroy@csgroup.eu

arch/powerpc/include/asm/interrupt.h

@@ -27,6 +27,7 @@
 #ifdef CONFIG_PPC_BOOK3S
 #define INTERRUPT_DOORBELL        0xa00
 #define INTERRUPT_PERFMON         0xf00
+#define INTERRUPT_ALTIVEC_UNAVAIL	0xf20
 #endif
 
 /* BookE/BookS/4xx/8xx */
@@ -57,6 +58,11 @@
 #define INTERRUPT_DATA_BREAKPOINT_8xx	0x1c00
 #define INTERRUPT_INST_BREAKPOINT_8xx	0x1d00
 
+/* 603 */
+#define INTERRUPT_INST_TLB_MISS_603		0x1000
+#define INTERRUPT_DATA_LOAD_TLB_MISS_603	0x1100
+#define INTERRUPT_DATA_STORE_TLB_MISS_603	0x1200
+
 #ifndef __ASSEMBLY__
 
 #include <linux/context_tracking.h>

arch/powerpc/kernel/head_book3s_32.S

@@ -31,6 +31,7 @@
 #include <asm/kvm_book3s_asm.h>
 #include <asm/export.h>
 #include <asm/feature-fixups.h>
+#include <asm/interrupt.h>
 
 #include "head_32.h"
 
@@ -239,7 +240,7 @@ __secondary_hold_acknowledge:
 /* System reset */
 /* core99 pmac starts the seconary here by changing the vector, and
    putting it back to what it was (unknown_async_exception) when done.  */
-	EXCEPTION(0x100, Reset, unknown_async_exception)
+	EXCEPTION(INTERRUPT_SYSTEM_RESET, Reset, unknown_async_exception)
 
 /* Machine check */
 /*
@@ -255,7 +256,7 @@ __secondary_hold_acknowledge:
  * pointer when we take an exception from supervisor mode.)
  *	-- paulus.
  */
-	START_EXCEPTION(0x200, MachineCheck)
+	START_EXCEPTION(INTERRUPT_MACHINE_CHECK, MachineCheck)
 	EXCEPTION_PROLOG_0
 #ifdef CONFIG_PPC_CHRP
 	mtspr	SPRN_SPRG_SCRATCH2,r1
@@ -276,7 +277,7 @@ __secondary_hold_acknowledge:
 	b	interrupt_return
 
 /* Data access exception. */
-	START_EXCEPTION(0x300, DataAccess)
+	START_EXCEPTION(INTERRUPT_DATA_STORAGE, DataAccess)
 #ifdef CONFIG_PPC_BOOK3S_604
 BEGIN_MMU_FTR_SECTION
 	mtspr	SPRN_SPRG_SCRATCH2,r10
@@ -297,7 +298,7 @@ ALT_MMU_FTR_SECTION_END_IFSET(MMU_FTR_HPTE_TABLE)
 #endif
 1:	EXCEPTION_PROLOG_0 handle_dar_dsisr=1
 	EXCEPTION_PROLOG_1
-	EXCEPTION_PROLOG_2 0x300 DataAccess handle_dar_dsisr=1
+	EXCEPTION_PROLOG_2 INTERRUPT_DATA_STORAGE DataAccess handle_dar_dsisr=1
 	prepare_transfer_to_handler
 	lwz	r5, _DSISR(r11)
 	andis.	r0, r5, DSISR_DABRMATCH@h
@@ -310,7 +311,7 @@ ALT_MMU_FTR_SECTION_END_IFSET(MMU_FTR_HPTE_TABLE)
 
 
 /* Instruction access exception. */
-	START_EXCEPTION(0x400, InstructionAccess)
+	START_EXCEPTION(INTERRUPT_INST_STORAGE, InstructionAccess)
 	mtspr	SPRN_SPRG_SCRATCH0,r10
 	mtspr	SPRN_SPRG_SCRATCH1,r11
 	mfspr	r10, SPRN_SPRG_THREAD
@@ -330,7 +331,7 @@ END_MMU_FTR_SECTION_IFSET(MMU_FTR_HPTE_TABLE)
 	andi.	r11, r11, MSR_PR
 
 	EXCEPTION_PROLOG_1
-	EXCEPTION_PROLOG_2 0x400 InstructionAccess
+	EXCEPTION_PROLOG_2 INTERRUPT_INST_STORAGE InstructionAccess
 	andis.	r5,r9,DSISR_SRR1_MATCH_32S@h /* Filter relevant SRR1 bits */
 	stw	r5, _DSISR(r11)
 	stw	r12, _DAR(r11)
@@ -339,19 +340,19 @@ END_MMU_FTR_SECTION_IFSET(MMU_FTR_HPTE_TABLE)
 	b	interrupt_return
 
 /* External interrupt */
-	EXCEPTION(0x500, HardwareInterrupt, do_IRQ)
+	EXCEPTION(INTERRUPT_EXTERNAL, HardwareInterrupt, do_IRQ)
 
 /* Alignment exception */
-	START_EXCEPTION(0x600, Alignment)
-	EXCEPTION_PROLOG 0x600 Alignment handle_dar_dsisr=1
+	START_EXCEPTION(INTERRUPT_ALIGNMENT, Alignment)
+	EXCEPTION_PROLOG INTERRUPT_ALIGNMENT Alignment handle_dar_dsisr=1
 	prepare_transfer_to_handler
 	bl	alignment_exception
 	REST_NVGPRS(r1)
 	b	interrupt_return
 
 /* Program check exception */
-	START_EXCEPTION(0x700, ProgramCheck)
-	EXCEPTION_PROLOG 0x700 ProgramCheck
+	START_EXCEPTION(INTERRUPT_PROGRAM, ProgramCheck)
+	EXCEPTION_PROLOG INTERRUPT_PROGRAM ProgramCheck
 	prepare_transfer_to_handler
 	bl	program_check_exception
 	REST_NVGPRS(r1)
@@ -367,7 +368,7 @@ BEGIN_FTR_SECTION
  */
 	b 	ProgramCheck
 END_FTR_SECTION_IFSET(CPU_FTR_FPU_UNAVAILABLE)
-	EXCEPTION_PROLOG 0x800 FPUnavailable
+	EXCEPTION_PROLOG INTERRUPT_FP_UNAVAIL FPUnavailable
 	beq	1f
 	bl	load_up_fpu		/* if from user, just load it up */
 	b	fast_exception_return
@@ -379,16 +380,16 @@ END_FTR_SECTION_IFSET(CPU_FTR_FPU_UNAVAILABLE)
 #endif
 
 /* Decrementer */
-	EXCEPTION(0x900, Decrementer, timer_interrupt)
+	EXCEPTION(INTERRUPT_DECREMENTER, Decrementer, timer_interrupt)
 
 	EXCEPTION(0xa00, Trap_0a, unknown_exception)
 	EXCEPTION(0xb00, Trap_0b, unknown_exception)
 
 /* System call */
-	START_EXCEPTION(0xc00, SystemCall)
-	SYSCALL_ENTRY	0xc00
+	START_EXCEPTION(INTERRUPT_SYSCALL, SystemCall)
+	SYSCALL_ENTRY	INTERRUPT_SYSCALL
 
-	EXCEPTION(0xd00, SingleStep, single_step_exception)
+	EXCEPTION(INTERRUPT_TRACE, SingleStep, single_step_exception)
 	EXCEPTION(0xe00, Trap_0e, unknown_exception)
 
 /*
@@ -399,10 +400,10 @@ END_FTR_SECTION_IFSET(CPU_FTR_FPU_UNAVAILABLE)
  * non-altivec kernel running on a machine with altivec just
  * by executing an altivec instruction.
  */
-	START_EXCEPTION(0xf00, PerformanceMonitorTrap)
+	START_EXCEPTION(INTERRUPT_PERFMON, PerformanceMonitorTrap)
 	b	PerformanceMonitor
 
-	START_EXCEPTION(0xf20, AltiVecUnavailableTrap)
+	START_EXCEPTION(INTERRUPT_ALTIVEC_UNAVAIL, AltiVecUnavailableTrap)
 	b	AltiVecUnavailable
 
 	__HEAD
@@ -410,7 +411,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_FPU_UNAVAILABLE)
  * Handle TLB miss for instruction on 603/603e.
  * Note: we get an alternate set of r0 - r3 to use automatically.
  */
-	. = 0x1000
+	. = INTERRUPT_INST_TLB_MISS_603
 InstructionTLBMiss:
 /*
  * r0:	scratch
@@ -476,7 +477,7 @@ InstructionAddressInvalid:
 /*
  * Handle TLB miss for DATA Load operation on 603/603e
  */
-	. = 0x1100
+	. = INTERRUPT_DATA_LOAD_TLB_MISS_603
 DataLoadTLBMiss:
 /*
  * r0:	scratch
@@ -554,7 +555,7 @@ DataAddressInvalid:
 /*
  * Handle TLB miss for DATA Store on 603/603e
  */
-	. = 0x1200
+	. = INTERRUPT_DATA_STORE_TLB_MISS_603
 DataStoreTLBMiss:
 /*
  * r0:	scratch