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Subject[RFC PATCH v1 18/41] powerpc/32: Use START_EXCEPTION() as much as possible
Date
Everywhere where it is possible, use START_EXCEPTION().

This will help for proper exception init in future patches.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
---
arch/powerpc/kernel/head_40x.S | 12 +++++------
arch/powerpc/kernel/head_8xx.S | 27 +++++++++----------------
arch/powerpc/kernel/head_book3s_32.S | 30 ++++++++--------------------
3 files changed, 22 insertions(+), 47 deletions(-)

diff --git a/arch/powerpc/kernel/head_40x.S b/arch/powerpc/kernel/head_40x.S
index 55fa99c5085c..c14a71e0d6d3 100644
--- a/arch/powerpc/kernel/head_40x.S
+++ b/arch/powerpc/kernel/head_40x.S
@@ -247,17 +247,15 @@ _ENTRY(crit_esr)
EXCEPTION(0x0F00, Trap_0F, unknown_exception, EXC_XFER_STD)

/* 0x1000 - Programmable Interval Timer (PIT) Exception */
- . = 0x1000
+ START_EXCEPTION(0x1000, DecrementerTrap)
b Decrementer

-/* 0x1010 - Fixed Interval Timer (FIT) Exception
-*/
- . = 0x1010
+/* 0x1010 - Fixed Interval Timer (FIT) Exception */
+ START_EXCEPTION(0x1010, FITExceptionTrap)
b FITException

-/* 0x1020 - Watchdog Timer (WDT) Exception
-*/
- . = 0x1020
+/* 0x1020 - Watchdog Timer (WDT) Exception */
+ START_EXCEPTION(0x1020, WDTExceptionTrap)
b WDTException

/* 0x1100 - Data TLB Miss Exception
diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S
index b63445c55f4d..11789a077d76 100644
--- a/arch/powerpc/kernel/head_8xx.S
+++ b/arch/powerpc/kernel/head_8xx.S
@@ -121,8 +121,7 @@ instruction_counter:
EXCEPTION(0x100, Reset, system_reset_exception, EXC_XFER_STD)

/* Machine check */
- . = 0x200
-MachineCheck:
+ START_EXCEPTION(0x200, MachineCheck)
EXCEPTION_PROLOG handle_dar_dsisr=1
addi r3,r1,STACK_FRAME_OVERHEAD
EXC_XFER_STD(0x200, machine_check_exception)
@@ -131,8 +130,7 @@ MachineCheck:
EXCEPTION(0x500, HardwareInterrupt, do_IRQ, EXC_XFER_LITE)

/* Alignment exception */
- . = 0x600
-Alignment:
+ START_EXCEPTION(0x600, Alignment)
EXCEPTION_PROLOG handle_dar_dsisr=1
addi r3,r1,STACK_FRAME_OVERHEAD
b .Lalignment_exception_ool
@@ -149,8 +147,7 @@ Alignment:
EXC_XFER_STD(0x600, alignment_exception)

/* System call */
- . = 0xc00
-SystemCall:
+ START_EXCEPTION(0xc00, SystemCall)
SYSCALL_ENTRY 0xc00

/* Single step - not used on 601 */
@@ -161,7 +158,6 @@ SystemCall:
*/
EXCEPTION(0x1000, SoftEmu, emulation_assist_interrupt, EXC_XFER_STD)

- . = 0x1100
/*
* For the MPC8xx, this is a software tablewalk to load the instruction
* TLB. The task switch loads the M_TWB register with the pointer to the first
@@ -183,7 +179,7 @@ SystemCall:
#define INVALIDATE_ADJACENT_PAGES_CPU15(addr, tmp)
#endif

-InstructionTLBMiss:
+ START_EXCEPTION(0x1100, InstructionTLBMiss)
mtspr SPRN_SPRG_SCRATCH2, r10
mtspr SPRN_M_TW, r11

@@ -239,8 +235,7 @@ InstructionTLBMiss:
rfi
#endif

- . = 0x1200
-DataStoreTLBMiss:
+ START_EXCEPTION(0x1200, DataStoreTLBMiss)
mtspr SPRN_SPRG_SCRATCH2, r10
mtspr SPRN_M_TW, r11
mfcr r11
@@ -303,8 +298,7 @@ DataStoreTLBMiss:
* to many reasons, such as executing guarded memory or illegal instruction
* addresses. There is nothing to do but handle a big time error fault.
*/
- . = 0x1300
-InstructionTLBError:
+ START_EXCEPTION(0x1300, InstructionTLBError)
EXCEPTION_PROLOG
andis. r5,r9,DSISR_SRR1_MATCH_32S@h /* Filter relevant SRR1 bits */
andis. r10,r9,SRR1_ISI_NOPT@h
@@ -320,8 +314,7 @@ InstructionTLBError:
* many reasons, including a dirty update to a pte. We bail out to
* a higher level function that can handle it.
*/
- . = 0x1400
-DataTLBError:
+ START_EXCEPTION(0x1400, DataTLBError)
EXCEPTION_PROLOG_0 handle_dar_dsisr=1
mfspr r11, SPRN_DAR
cmpwi cr1, r11, RPN_PATTERN
@@ -354,8 +347,7 @@ do_databreakpoint:
stw r4,_DAR(r11)
EXC_XFER_STD(0x1c00, do_break)

- . = 0x1c00
-DataBreakpoint:
+ START_EXCEPTION(0x1c00, DataBreakpoint)
EXCEPTION_PROLOG_0 handle_dar_dsisr=1
mfspr r11, SPRN_SRR0
cmplwi cr1, r11, (.Ldtlbie - PAGE_OFFSET)@l
@@ -368,8 +360,7 @@ DataBreakpoint:
rfi

#ifdef CONFIG_PERF_EVENTS
- . = 0x1d00
-InstructionBreakpoint:
+ START_EXCEPTION(0x1d00, InstructionBreakpoint)
mtspr SPRN_SPRG_SCRATCH0, r10
lwz r10, (instruction_counter - PAGE_OFFSET)@l(0)
addi r10, r10, -1
diff --git a/arch/powerpc/kernel/head_book3s_32.S b/arch/powerpc/kernel/head_book3s_32.S
index 9dc05890477d..8f5c8c8da63d 100644
--- a/arch/powerpc/kernel/head_book3s_32.S
+++ b/arch/powerpc/kernel/head_book3s_32.S
@@ -255,9 +255,7 @@ __secondary_hold_acknowledge:
* pointer when we take an exception from supervisor mode.)
* -- paulus.
*/
- . = 0x200
- DO_KVM 0x200
-MachineCheck:
+ START_EXCEPTION(0x200, MachineCheck)
EXCEPTION_PROLOG_0
#ifdef CONFIG_PPC_CHRP
mtspr SPRN_SPRG_SCRATCH2,r1
@@ -278,9 +276,7 @@ MachineCheck:
#endif

/* Data access exception. */
- . = 0x300
- DO_KVM 0x300
-DataAccess:
+ START_EXCEPTION(0x300, DataAccess)
#ifdef CONFIG_PPC_BOOK3S_604
BEGIN_MMU_FTR_SECTION
mtspr SPRN_SPRG_SCRATCH2,r10
@@ -304,9 +300,7 @@ ALT_MMU_FTR_SECTION_END_IFSET(MMU_FTR_HPTE_TABLE)
b handle_page_fault_tramp_1

/* Instruction access exception. */
- . = 0x400
- DO_KVM 0x400
-InstructionAccess:
+ START_EXCEPTION(0x400, InstructionAccess)
mtspr SPRN_SPRG_SCRATCH0,r10
mtspr SPRN_SPRG_SCRATCH1,r11
mfspr r10, SPRN_SPRG_THREAD
@@ -336,9 +330,7 @@ END_MMU_FTR_SECTION_IFSET(MMU_FTR_HPTE_TABLE)
EXCEPTION(0x500, HardwareInterrupt, do_IRQ, EXC_XFER_LITE)

/* Alignment exception */
- . = 0x600
- DO_KVM 0x600
-Alignment:
+ START_EXCEPTION(0x600, Alignment)
EXCEPTION_PROLOG handle_dar_dsisr=1
addi r3,r1,STACK_FRAME_OVERHEAD
b alignment_exception_tramp
@@ -347,9 +339,7 @@ Alignment:
EXCEPTION(0x700, ProgramCheck, program_check_exception, EXC_XFER_STD)

/* Floating-point unavailable */
- . = 0x800
- DO_KVM 0x800
-FPUnavailable:
+ START_EXCEPTION(0x800, FPUnavailable)
#ifdef CONFIG_PPC_FPU
BEGIN_FTR_SECTION
/*
@@ -375,9 +365,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_FPU_UNAVAILABLE)
EXCEPTION(0xb00, Trap_0b, unknown_exception, EXC_XFER_STD)

/* System call */
- . = 0xc00
- DO_KVM 0xc00
-SystemCall:
+ START_EXCEPTION(0xc00, SystemCall)
SYSCALL_ENTRY 0xc00

EXCEPTION(0xd00, SingleStep, single_step_exception, EXC_XFER_STD)
@@ -391,12 +379,10 @@ SystemCall:
* non-altivec kernel running on a machine with altivec just
* by executing an altivec instruction.
*/
- . = 0xf00
- DO_KVM 0xf00
+ START_EXCEPTION(0xf00, PerformanceMonitorTrap)
b PerformanceMonitor

- . = 0xf20
- DO_KVM 0xf20
+ START_EXCEPTION(0xf20, AltiVecUnavailableTrap)
b AltiVecUnavailable

/*
--
2.25.0
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