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xtensa: Save PS correctly in syscall handler

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"EPS" is not a real register. It's just a base value of EPS_{2..7}.
This commit is contained in:
YAMAMOTO Takashi 2020-03-31 13:06:52 +09:00 committed by Xiang Xiao
parent 80c05979fe
commit 18d3fa9eea
1 changed files with 2 additions and 2 deletions
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4
arch/xtensa/src/common/xtensa_user_handler.S
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@ -287,7 +287,7 @@ _xtensa_syscall_handler:
mov a0, sp /* sp == a1 */
addi sp, sp, -(4 * XCPTCONTEXT_SIZE) /* Allocate interrupt stack frame */
s32i a0, sp, (4 * REG_A1) /* Save pre-interrupt SP */
rsr a0, EPS /* Save interruptee's PS */
rsr a0, PS /* Save interruptee's PS */
s32i a0, sp, (4 * REG_PS)
rsr a0, EXCSAVE_1 /* Save interruptee's a0 */
s32i a0, sp, (4 * REG_A0)
@ -390,7 +390,7 @@ _xtensa_syscall_handler:
l32i a0, a2, (4 * REG_A0) /* Retrieve interruptee's A0 */
l32i sp, a2, (4 * REG_A1) /* Remove interrupt stack frame */
l32i a2, a2, (4 * REG_A2) /* Retrieve interruptee's A2 */
rsync /* Ensure EPS and EPC written */
rsync /* Ensure PS and EPC written */
/* Return from exception. RFE returns from either the UserExceptionVector
* or the KernelExceptionVector. RFE sets PS.EXCM back to 0, and then