mirror of https://github.com/golang/go.git
57 lines
1.8 KiB
ArmAsm
57 lines
1.8 KiB
ArmAsm
// Copyright 2012 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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SUB $(8*9), R13 // Reserve space for the floating point registers.
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// The C arguments arrive in R0, R1, R2, and R3. We want to
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// pass R0, R1, and R3 to Go, so we push those on the stack.
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// Also, save C callee-save registers R4-R12.
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MOVM.WP [R0, R1, R3, R4, R5, R6, R7, R8, R9, g, R11, R12], (R13)
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// Finally, save the link register R14. This also puts the
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// arguments we pushed for cgocallback where they need to be,
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// starting at 4(R13).
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MOVW.W R14, -4(R13)
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// Skip floating point registers on GOARM < 6.
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MOVB runtime·goarm(SB), R11
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CMP $6, R11
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BLT skipfpsave
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MOVD F8, (13*4+8*1)(R13)
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MOVD F9, (13*4+8*2)(R13)
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MOVD F10, (13*4+8*3)(R13)
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MOVD F11, (13*4+8*4)(R13)
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MOVD F12, (13*4+8*5)(R13)
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MOVD F13, (13*4+8*6)(R13)
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MOVD F14, (13*4+8*7)(R13)
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MOVD F15, (13*4+8*8)(R13)
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skipfpsave:
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BL runtime·load_g(SB)
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// We set up the arguments to cgocallback when saving registers above.
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BL runtime·cgocallback(SB)
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MOVB runtime·goarm(SB), R11
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CMP $6, R11
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BLT skipfprest
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MOVD (13*4+8*1)(R13), F8
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MOVD (13*4+8*2)(R13), F9
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MOVD (13*4+8*3)(R13), F10
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MOVD (13*4+8*4)(R13), F11
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MOVD (13*4+8*5)(R13), F12
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MOVD (13*4+8*6)(R13), F13
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MOVD (13*4+8*7)(R13), F14
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MOVD (13*4+8*8)(R13), F15
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skipfprest:
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MOVW.P 4(R13), R14
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MOVM.IAW (R13), [R0, R1, R3, R4, R5, R6, R7, R8, R9, g, R11, R12]
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ADD $(8*9), R13
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MOVW R14, R15
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