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-rw-r--r--arch/xtensa/kernel/entry.S36
1 files changed, 14 insertions, 22 deletions
diff --git a/arch/xtensa/kernel/entry.S b/arch/xtensa/kernel/entry.S
index 9e271ba..8dc7a2c 100644
--- a/arch/xtensa/kernel/entry.S
+++ b/arch/xtensa/kernel/entry.S
@@ -125,8 +125,9 @@ _user_exception:
movi a2, 0
rsr a3, SAR
- wsr a2, ICOUNTLEVEL
+ xsr a2, ICOUNTLEVEL
s32i a3, a1, PT_SAR
+ s32i a2, a1, PT_ICOUNTLEVEL
/* Rotate ws so that the current windowbase is at bit0. */
/* Assume ws = xxwww1yyyy. Rotate ws right, so that a2 = yyyyxxwww1 */
@@ -276,8 +277,9 @@ _kernel_exception:
movi a2, 0
rsr a3, SAR
- wsr a2, ICOUNTLEVEL
+ xsr a2, ICOUNTLEVEL
s32i a3, a1, PT_SAR
+ s32i a2, a1, PT_ICOUNTLEVEL
/* Rotate ws so that the current windowbase is at bit0. */
/* Assume ws = xxwww1yyyy. Rotate ws right, so that a2 = yyyyxxwww1 */
@@ -330,14 +332,16 @@ _kernel_exception:
common_exception:
- /* Save EXCVADDR, DEBUGCAUSE, and PC, and clear LCOUNT */
+ /* Save some registers, disable loops and clear the syscall flag. */
rsr a2, DEBUGCAUSE
rsr a3, EPC_1
s32i a2, a1, PT_DEBUGCAUSE
s32i a3, a1, PT_PC
+ movi a2, -1
rsr a3, EXCVADDR
+ s32i a2, a1, PT_SYSCALL
movi a2, 0
s32i a3, a1, PT_EXCVADDR
xsr a2, LCOUNT
@@ -450,27 +454,8 @@ common_exception_return:
/* Restore the state of the task and return from the exception. */
-
- /* If we are returning from a user exception, and the process
- * to run next has PT_SINGLESTEP set, we want to setup
- * ICOUNT and ICOUNTLEVEL to step one instruction.
- * PT_SINGLESTEP is set by sys_ptrace (ptrace.c)
- */
-
4: /* a2 holds GET_CURRENT(a2,a1) */
- l32i a3, a2, TI_TASK
- l32i a3, a3, TASK_PTRACE
- bbci.l a3, PT_SINGLESTEP_BIT, 1f # jump if single-step flag is not set
-
- movi a3, -2 # PT_SINGLESTEP flag is set,
- movi a4, 1 # icountlevel of 1 means it won't
- wsr a3, ICOUNT # start counting until after rfe
- wsr a4, ICOUNTLEVEL # so setup icount & icountlevel.
- isync
-
-1:
-
#if XCHAL_EXTRA_SA_SIZE
/* For user exceptions, restore the extra state from the user's TCB. */
@@ -665,6 +650,13 @@ common_exception_exit:
wsr a3, LEND
wsr a2, LCOUNT
+ /* We control single stepping through the ICOUNTLEVEL register. */
+
+ l32i a2, a1, PT_ICOUNTLEVEL
+ movi a3, -2
+ wsr a2, ICOUNTLEVEL
+ wsr a3, ICOUNT
+
/* Check if it was double exception. */
l32i a0, a1, PT_DEPC
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