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Text file src/runtime/cgo/asm_arm.s

Documentation: runtime/cgo

     1	// Copyright 2012 The Go Authors. All rights reserved.
     2	// Use of this source code is governed by a BSD-style
     3	// license that can be found in the LICENSE file.
     4	
     5	#include "textflag.h"
     6	
     7	// Called by C code generated by cmd/cgo.
     8	// func crosscall2(fn func(a unsafe.Pointer, n int32, ctxt uintptr), a unsafe.Pointer, n int32, ctxt uintptr)
     9	// Saves C callee-saved registers and calls fn with three arguments.
    10	TEXT crosscall2(SB),NOSPLIT,$-4
    11		/* 
    12		 * We still need to save all callee save register as before, and then
    13		 *  push 3 args for fn (R1, R2, R3).
    14		 * Also note that at procedure entry in gc world, 4(R13) will be the
    15		 *  first arg, so we must push another dummy reg (R0) for 0(R13).
    16		 *  Additionally, runtime·load_g will clobber R0, so we need to save R0
    17		 *  nevertheless.
    18		 */
    19		SUB	$(8*9), R13 // Reserve space for the floating point registers.
    20		MOVM.WP	[R0, R1, R2, R3, R4, R5, R6, R7, R8, R9, g, R11, R12, R14], (R13)
    21	
    22		// Skip floating point registers on GOARM < 6.
    23		MOVB    runtime·goarm(SB), R11
    24		CMP $6, R11
    25		BLT skipfpsave
    26		MOVD	F8, (14*4+8*1)(R13)
    27		MOVD	F9, (14*4+8*2)(R13)
    28		MOVD	F10, (14*4+8*3)(R13)
    29		MOVD	F11, (14*4+8*4)(R13)
    30		MOVD	F12, (14*4+8*5)(R13)
    31		MOVD	F13, (14*4+8*6)(R13)
    32		MOVD	F14, (14*4+8*7)(R13)
    33		MOVD	F15, (14*4+8*8)(R13)
    34	
    35	skipfpsave:
    36		BL	runtime·load_g(SB)
    37		MOVW	R15, R14 // R15 is PC.
    38		MOVW	0(R13), R15
    39	
    40		MOVB    runtime·goarm(SB), R11
    41		CMP $6, R11
    42		BLT skipfprest
    43		MOVD	(14*4+8*1)(R13), F8
    44		MOVD	(14*4+8*2)(R13), F9
    45		MOVD	(14*4+8*3)(R13), F10
    46		MOVD	(14*4+8*4)(R13), F11
    47		MOVD	(14*4+8*5)(R13), F12
    48		MOVD	(14*4+8*6)(R13), F13
    49		MOVD	(14*4+8*7)(R13), F14
    50		MOVD	(14*4+8*8)(R13), F15
    51	
    52	skipfprest:
    53		MOVM.IAW	(R13), [R0, R1, R2, R3, R4, R5, R6, R7, R8, R9, g, R11, R12, R14]
    54		ADD	$(8*9), R13
    55		MOVW	R14, R15

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