diff options
Diffstat (limited to 'src/runtime/cgo/asm_amd64.s')
| -rw-r--r-- | src/runtime/cgo/asm_amd64.s | 20 |
1 files changed, 12 insertions, 8 deletions
diff --git a/src/runtime/cgo/asm_amd64.s b/src/runtime/cgo/asm_amd64.s index 06c538b9bc..5dc8e2d235 100644 --- a/src/runtime/cgo/asm_amd64.s +++ b/src/runtime/cgo/asm_amd64.s @@ -5,8 +5,10 @@ #include "textflag.h" // Called by C code generated by cmd/cgo. -// func crosscall2(fn func(a unsafe.Pointer, n int32, ctxt uintptr), a unsafe.Pointer, n int32, ctxt uintptr) -// Saves C callee-saved registers and calls fn with three arguments. +// func crosscall2(fn, a unsafe.Pointer, n int32, ctxt uintptr) +// Saves C callee-saved registers and calls cgocallback with three arguments. +// fn is the PC of a func(a unsafe.Pointer) function. +// This signature is known to SWIG, so we can't change it. #ifndef GOOS_windows TEXT crosscall2(SB),NOSPLIT,$0x50-0 /* keeps stack pointer 32-byte aligned */ #else @@ -33,11 +35,12 @@ TEXT crosscall2(SB),NOSPLIT,$0x110-0 /* also need to save xmm6 - xmm15 */ MOVUPS X14, 0xe0(SP) MOVUPS X15, 0xf0(SP) - MOVQ DX, 0x0(SP) /* arg */ - MOVQ R8, 0x8(SP) /* argsize (includes padding) */ + MOVQ CX, 0x0(SP) /* fn */ + MOVQ DX, 0x8(SP) /* arg */ + // Skip n in R8. MOVQ R9, 0x10(SP) /* ctxt */ - CALL CX /* fn */ + CALL runtime·cgocallback(SB) MOVQ 0x48(SP), DI MOVQ 0x50(SP), SI @@ -52,11 +55,12 @@ TEXT crosscall2(SB),NOSPLIT,$0x110-0 /* also need to save xmm6 - xmm15 */ MOVUPS 0xe0(SP), X14 MOVUPS 0xf0(SP), X15 #else - MOVQ SI, 0x0(SP) /* arg */ - MOVQ DX, 0x8(SP) /* argsize (includes padding) */ + MOVQ DI, 0x0(SP) /* fn */ + MOVQ SI, 0x8(SP) /* arg */ + // Skip n in DX. MOVQ CX, 0x10(SP) /* ctxt */ - CALL DI /* fn */ + CALL runtime·cgocallback(SB) #endif MOVQ 0x18(SP), BX |