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// Copyright 2012 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 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.
TEXT crosscall2(SB),NOSPLIT|NOFRAME,$0
/*
* We still need to save all callee save register as before, and then
* push 3 args for fn (R1, R2, R3).
* Also note that at procedure entry in gc world, 4(R13) will be the
* first arg, so we must push another dummy reg (R0) for 0(R13).
* Additionally, runtime·load_g will clobber R0, so we need to save R0
* nevertheless.
*/
SUB $(8*9), R13 // Reserve space for the floating point registers.
MOVM.WP [R0, R1, R2, R3, R4, R5, R6, R7, R8, R9, g, R11, R12, R14], (R13)
// Skip floating point registers on GOARM < 6.
MOVB runtime·goarm(SB), R11
CMP $6, R11
BLT skipfpsave
MOVD F8, (14*4+8*1)(R13)
MOVD F9, (14*4+8*2)(R13)
MOVD F10, (14*4+8*3)(R13)
MOVD F11, (14*4+8*4)(R13)
MOVD F12, (14*4+8*5)(R13)
MOVD F13, (14*4+8*6)(R13)
MOVD F14, (14*4+8*7)(R13)
MOVD F15, (14*4+8*8)(R13)
skipfpsave:
BL runtime·load_g(SB)
MOVW R15, R14 // R15 is PC.
MOVW 0(R13), R15
MOVB runtime·goarm(SB), R11
CMP $6, R11
BLT skipfprest
MOVD (14*4+8*1)(R13), F8
MOVD (14*4+8*2)(R13), F9
MOVD (14*4+8*3)(R13), F10
MOVD (14*4+8*4)(R13), F11
MOVD (14*4+8*5)(R13), F12
MOVD (14*4+8*6)(R13), F13
MOVD (14*4+8*7)(R13), F14
MOVD (14*4+8*8)(R13), F15
skipfprest:
MOVM.IAW (R13), [R0, R1, R2, R3, R4, R5, R6, R7, R8, R9, g, R11, R12, R14]
ADD $(8*9), R13
MOVW R14, R15
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