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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
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