mirror of https://github.com/golang/go.git
56 lines
1.3 KiB
ArmAsm
56 lines
1.3 KiB
ArmAsm
// Copyright 2016 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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#include "textflag.h"
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// Called by C code generated by cmd/cgo.
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// func crosscall2(fn, a unsafe.Pointer, n int32, ctxt uintptr)
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// Saves C callee-saved registers and calls cgocallback with three arguments.
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// fn is the PC of a func(a unsafe.Pointer) function.
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TEXT crosscall2(SB),NOSPLIT|NOFRAME,$0
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// Start with standard C stack frame layout and linkage.
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// Save R6-R15 in the register save area of the calling function.
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STMG R6, R15, 48(R15)
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// Allocate 96 bytes on the stack.
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MOVD $-96(R15), R15
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// Save F8-F15 in our stack frame.
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FMOVD F8, 32(R15)
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FMOVD F9, 40(R15)
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FMOVD F10, 48(R15)
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FMOVD F11, 56(R15)
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FMOVD F12, 64(R15)
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FMOVD F13, 72(R15)
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FMOVD F14, 80(R15)
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FMOVD F15, 88(R15)
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// Initialize Go ABI environment.
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BL runtime·load_g(SB)
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MOVD R2, 8(R15) // fn unsafe.Pointer
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MOVD R3, 16(R15) // a unsafe.Pointer
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// Skip R4 = n uint32
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MOVD R5, 24(R15) // ctxt uintptr
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BL runtime·cgocallback(SB)
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FMOVD 32(R15), F8
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FMOVD 40(R15), F9
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FMOVD 48(R15), F10
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FMOVD 56(R15), F11
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FMOVD 64(R15), F12
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FMOVD 72(R15), F13
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FMOVD 80(R15), F14
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FMOVD 88(R15), F15
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// De-allocate stack frame.
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MOVD $96(R15), R15
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// Restore R6-R15.
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LMG 48(R15), R6, R15
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RET
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