root/src/pkg/runtime/cgo/asm_arm.s

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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 "../../../cmd/ld/textflag.h"

/*
 * void crosscall2(void (*fn)(void*, int32), void*, int32)
 * Save registers and call fn with two arguments.
 */
TEXT crosscall2(SB),NOSPLIT,$-4
        /* 
         * We still need to save all callee save register as before, and then
         *  push 2 args for fn (R1 and R2).
         * Also note that at procedure entry in 5c/5g world, 4(R13) will be the
         *  first arg, so we must push another dummy reg (R0) for 0(R13).
         *  Additionally, runtimeĀ·load_gm will clobber R0, so we need to save R0
         *  nevertheless.
         */
        MOVM.WP [R0, R1, R2, R4, R5, R6, R7, R8, m, g, R11, R12, R14], (R13)
        BL      runtimeĀ·load_gm(SB)
        MOVW    PC, R14
        MOVW    0(R13), PC
        MOVM.IAW        (R13), [R0, R1, R2, R4, R5, R6, R7, R8, m, g, R11, R12, PC]

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