diff options
| author | Yuxin Zhou <[email protected]> | 2022-04-20 05:07:02 +0000 |
|---|---|---|
| committer | Yuxin Zhou <[email protected]> | 2022-04-20 05:07:02 +0000 |
| commit | cef9cb22a5e2b9bca56074c5e627225ec0dd3d73 (patch) | |
| tree | ace896ab3613348e16eef2a543affa2c984ee6ea /ports/xtensa/xcc/src/xtensa_coproc_handler.S | |
| parent | f851772ce02633f62d2fb4d043766ea54268684f (diff) | |
Release 6.1.11
Diffstat (limited to 'ports/xtensa/xcc/src/xtensa_coproc_handler.S')
| -rw-r--r-- | ports/xtensa/xcc/src/xtensa_coproc_handler.S | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/ports/xtensa/xcc/src/xtensa_coproc_handler.S b/ports/xtensa/xcc/src/xtensa_coproc_handler.S index ee55e471..33de2070 100644 --- a/ports/xtensa/xcc/src/xtensa_coproc_handler.S +++ b/ports/xtensa/xcc/src/xtensa_coproc_handler.S @@ -461,8 +461,10 @@ _xt_coproc_restorecs: //----------------------------------------------------------------------------- // For XEA3, coprocessor exceptions come here. This is a wrapper function that -// calls _xt_coproc_handler() to do the actual work. Since the handler can be -// interrupted make sure that no context switch occurs. +// calls _xt_coproc_handler() to do the actual work. We don't want the handler +// to be interrupted because that might cause a round-robin switch and leave +// coprocessor context in a confused state. So interrupts are disabled before +// calling the handler. They will be re-enabled on return from exception. //----------------------------------------------------------------------------- .text @@ -474,9 +476,9 @@ _xt_coproc_exc: #ifdef __XTENSA_CALL0_ABI__ addi a1, a1, -16 // reserve 16 bytes on stack s32i a0, a1, 0 // save return address - s32i a2, a1, 4 // save a2 s32i a15, a1, 8 // must save a15 (see dispatch) - l32i a2, a1, 4 + movi a3, PS_DI_MASK + xps a3, a3 // Set PS.DI, disable interrupts l32i a3, a2, XT_STK_EXCCAUSE // a3 <- exccause extui a2, a3, 8, 4 // a2 <- CP index call0 _xt_coproc_handler @@ -487,6 +489,8 @@ _xt_coproc_exc: #else entry a1, 48 // reserve 16 bytes on stack s32i a0, a1, 0 // save return address + movi a3, PS_DI_MASK + xps a3, a3 // Set PS.DI, disable interrupts l32i a3, a2, XT_STK_EXCCAUSE // a3 <- exccause extui a2, a3, 8, 4 // a2 <- CP index call0 _xt_coproc_handler |