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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"
- // 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
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