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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.

/*
 * Apple still insists on underscore prefixes for C function names.
 */
#if defined(__APPLE__)
#define EXT(s) _##s
#else
#define EXT(s) s
#endif

// Apple's ld64 wants 4-byte alignment for ARM code sections.
// .align in both Apple as and GNU as treat n as aligning to 2**n bytes.
.align	2

/*
 * void crosscall_arm1(void (*fn)(void), void (*setg_gcc)(void *g), void *g)
 *
 * Calling into the 5c tool chain, where all registers are caller save.
 * Called from standard ARM EABI, where r4-r11 are callee-save, so they
 * must be saved explicitly.
 */
.globl EXT(crosscall_arm1)
EXT(crosscall_arm1):
	push {r4, r5, r6, r7, r8, r9, r10, r11, ip, lr}
	mov r4, r0
	mov r5, r1
	mov r0, r2

	// Because the assembler might target an earlier revision of the ISA
	// by default, we encode BLX as a .word.
	.word 0xe12fff35 // blx r5 // setg(g)
	.word 0xe12fff34 // blx r4 // fn()

	pop {r4, r5, r6, r7, r8, r9, r10, r11, ip, pc}


#ifdef __ELF__
.section .note.GNU-stack,"",%progbits
#endif