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fix: Fix kernel page fault exception handling causing system exception. 

Close #I3RAN4

Change-Id: Ice9bc67371ad85476ec99b46b7555d41abd93e94
This commit is contained in:
zhushengle 2021-05-14 12:56:56 +08:00
parent 8d419bb029
commit a89fb57f57
1 changed files with 8 additions and 2 deletions
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10
arch/arm/arm/src/los_hw_exc.S
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@ -181,6 +181,7 @@ _osExceptUndefInstrHdl:
MOV R2, #0
MOV R3, #0
STMFD SP!, {R2-R3} @ far and fsr fields, are 0 under this anomaly
STMFD SP!, {R4-R11}
MOV R0, #OS_EXCEPT_UNDEF_INSTR @ Set exception ID to OS_EXCEPT_UNDEF_INSTR.
B _osExceptDispatch @ Branch to global exception handler.
@ -240,6 +241,7 @@ _osKernelSVCHandler:
MOV R0, #0
STR R0, [SP, #0]
STR R0, [SP, #4]
STMFD SP!, {R4-R11}
MOV R0, #OS_EXCEPT_SWI @ Set exception ID to OS_EXCEPT_SWI.
B _osExceptDispatch @ Branch to global exception handler.
@ -261,9 +263,10 @@ _osExceptPrefetchAbortHdl:
MRC P15, 0, R2, C6, C0, 2
MRC P15, 0, R3, C5, C0, 1
STMFD SP!, {R2-R3} @ Save far and fsr
STMFD SP!, {R4-R11}
#ifdef LOSCFG_KERNEL_VM
LDR R0, [SP, #(11 * 4)]
LDR R0, [SP, #(19 * 4)]
AND R0, R0, #CPSR_MASK_MODE @ Interrupted mode
CMP R0, #CPSR_USER_MODE @ User mode
BNE _osKernelExceptPrefetchAbortHdl
@ -302,6 +305,7 @@ _osExceptDataAbortHdl:
MRC P15, 0, R2, C6, C0, 0
MRC P15, 0, R3, C5, C0, 0
STMFD SP!, {R2-R3} @ Save far and fsr
STMFD SP!, {R4-R11}
#ifdef LOSCFG_KERNEL_VM
MOV R1, SP
@ -320,6 +324,7 @@ _osExceptDataAbortHdl:
#ifdef LOSCFG_KERNEL_VM
_osExcPageFaultReturn:
LDMFD SP!, {R4-R11}
ADD SP, SP, #(2 * 4)
LDMFD SP, {R13, R14}^
ADD SP, SP, #(2 * 4) @ Jump reserved fileds
@ -340,6 +345,7 @@ _osExceptAddrAbortHdl:
MOV R2, #0
MOV R3, #0
STMFD SP!, {R2-R3} @ far and fsr fields, are 0 under this anomaly
STMFD SP!, {R4-R11}
MOV R0, #OS_EXCEPT_ADDR_ABORT @ Set exception ID to OS_EXCEPT_ADDR_ABORT.
B _osExceptDispatch @ Branch to global exception handler.
@ -357,12 +363,12 @@ _osExceptFiqHdl:
MOV R2, #0
MOV R3, #0
STMFD SP!, {R2-R3} @ far and fsr fields, are 0 under this anomaly
STMFD SP!, {R4-R11}
@ Description: Exception handler
@ Parameter : R0 Exception Type
@ Regs Hold : R3 Exception`s CPSR
_osExceptDispatch:
STMFD SP!, {R4-R11}
LDR R8, [SP, #(8 * 4)] @ Get far
LDR R9, [SP, #(9 * 4)] @ Get fsr