diff options
Diffstat (limited to 'src/pkg/runtime/asm_amd64.s')
| -rw-r--r-- | src/pkg/runtime/asm_amd64.s | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/src/pkg/runtime/asm_amd64.s b/src/pkg/runtime/asm_amd64.s index d41ab96d02..2bf9f7eb9f 100644 --- a/src/pkg/runtime/asm_amd64.s +++ b/src/pkg/runtime/asm_amd64.s @@ -446,19 +446,21 @@ TEXT runtime·asmcgocall(SB),7,$0 MOVQ (g_sched+gobuf_sp)(SI), SP // Now on a scheduling stack (a pthread-created stack). - SUBQ $48, SP + // Make sure we have enough room for 4 stack-backed fast-call + // registers as per windows amd64 calling convention. + SUBQ $64, SP ANDQ $~15, SP // alignment for gcc ABI - MOVQ DI, 32(SP) // save g - MOVQ DX, 24(SP) // save SP + MOVQ DI, 48(SP) // save g + MOVQ DX, 40(SP) // save SP MOVQ BX, DI // DI = first argument in AMD64 ABI MOVQ BX, CX // CX = first argument in Win64 CALL AX // Restore registers, g, stack pointer. get_tls(CX) - MOVQ 32(SP), DI + MOVQ 48(SP), DI MOVQ DI, g(CX) - MOVQ 24(SP), SP + MOVQ 40(SP), SP RET // cgocallback(void (*fn)(void*), void *frame, uintptr framesize) |