diff options
Diffstat (limited to 'src/runtime/asm_mipsx.s')
| -rw-r--r-- | src/runtime/asm_mipsx.s | 32 |
1 files changed, 28 insertions, 4 deletions
diff --git a/src/runtime/asm_mipsx.s b/src/runtime/asm_mipsx.s index fc81e76354..49f96044c4 100644 --- a/src/runtime/asm_mipsx.s +++ b/src/runtime/asm_mipsx.s @@ -459,13 +459,23 @@ g0: TEXT ·cgocallback(SB),NOSPLIT,$12-12 NO_LOCAL_POINTERS + // Skip cgocallbackg, just dropm when fn is nil, and frame is the saved g. + // It is used to dropm while thread is exiting. + MOVW fn+0(FP), R5 + BNE R5, loadg + // Restore the g from frame. + MOVW frame+4(FP), g + JMP dropm + +loadg: // Load m and g from thread-local storage. MOVB runtime·iscgo(SB), R1 BEQ R1, nocgo JAL runtime·load_g(SB) nocgo: - // If g is nil, Go did not create the current thread. + // If g is nil, Go did not create the current thread, + // or if this thread never called into Go on pthread platforms. // Call needm to obtain one for temporary use. // In this case, we're running on the thread stack, so there's // lots of space, but the linker doesn't know. Hide the call from @@ -478,7 +488,7 @@ nocgo: needm: MOVW g, savedm-4(SP) // g is zero, so is m. - MOVW $runtime·needm(SB), R4 + MOVW $runtime·needAndBindM(SB), R4 JAL (R4) // Set m->sched.sp = SP, so that if a panic happens @@ -549,10 +559,24 @@ havem: MOVW savedsp-12(SP), R2 // must match frame size MOVW R2, (g_sched+gobuf_sp)(g) - // If the m on entry was nil, we called needm above to borrow an m - // for the duration of the call. Since the call is over, return it with dropm. + // If the m on entry was nil, we called needm above to borrow an m, + // 1. for the duration of the call on non-pthread platforms, + // 2. or the duration of the C thread alive on pthread platforms. + // If the m on entry wasn't nil, + // 1. the thread might be a Go thread, + // 2. or it's wasn't the first call from a C thread on pthread platforms, + // since the we skip dropm to resue the m in the first call. MOVW savedm-4(SP), R3 BNE R3, droppedm + + // Skip dropm to reuse it in the next call, when a pthread key has been created. + MOVW _cgo_pthread_key_created(SB), R3 + // It means cgo is disabled when _cgo_pthread_key_created is a nil pointer, need dropm. + BEQ R3, dropm + MOVW (R3), R3 + BNE R3, droppedm + +dropm: MOVW $runtime·dropm(SB), R4 JAL (R4) droppedm: |