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// Copyright 2016 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. #include "textflag.h" // Set the x_crosscall2_ptr C function pointer variable point to crosscall2. // It's such a pointer chain: _crosscall2_ptr -> x_crosscall2_ptr -> crosscall2 // Use a local trampoline, to avoid taking the address of a dynamically exported // function. TEXT ·set_crosscall2(SB),NOSPLIT,$0-0 MOVD _crosscall2_ptr(SB), R1 MOVD $crosscall2_trampoline<>(SB), R2 MOVD R2, (R1) RET TEXT crosscall2_trampoline<>(SB),NOSPLIT,$0-0 JMP crosscall2(SB) // Called by C code generated by cmd/cgo. // 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. TEXT crosscall2(SB),NOSPLIT|NOFRAME,$0 // Start with standard C stack frame layout and linkage. // Save R6-R15 in the register save area of the calling function. STMG R6, R15, 48(R15) // Allocate 96 bytes on the stack. MOVD $-96(R15), R15 // Save F8-F15 in our stack frame. FMOVD F8, 32(R15) FMOVD F9, 40(R15) FMOVD F10, 48(R15) FMOVD F11, 56(R15) FMOVD F12, 64(R15) FMOVD F13, 72(R15) FMOVD F14, 80(R15) FMOVD F15, 88(R15) // Initialize Go ABI environment. BL runtime·load_g(SB) MOVD R2, 8(R15) // fn unsafe.Pointer MOVD R3, 16(R15) // a unsafe.Pointer // Skip R4 = n uint32 MOVD R5, 24(R15) // ctxt uintptr BL runtime·cgocallback(SB) FMOVD 32(R15), F8 FMOVD 40(R15), F9 FMOVD 48(R15), F10 FMOVD 56(R15), F11 FMOVD 64(R15), F12 FMOVD 72(R15), F13 FMOVD 80(R15), F14 FMOVD 88(R15), F15 // De-allocate stack frame. MOVD $96(R15), R15 // Restore R6-R15. LMG 48(R15), R6, R15 RET