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Text file src/runtime/cgo/gcc_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	/*
     6	 * Apple still insists on underscore prefixes for C function names.
     7	 */
     8	#if defined(__APPLE__)
     9	#define EXT(s) _##s
    10	#else
    11	#define EXT(s) s
    12	#endif
    13	
    14	// Apple's ld64 wants 4-byte alignment for ARM code sections.
    15	// .align in both Apple as and GNU as treat n as aligning to 2**n bytes.
    16	.align	2
    17	
    18	/*
    19	 * void crosscall_arm1(void (*fn)(void), void (*setg_gcc)(void *g), void *g)
    20	 *
    21	 * Calling into the 5c tool chain, where all registers are caller save.
    22	 * Called from standard ARM EABI, where r4-r11 are callee-save, so they
    23	 * must be saved explicitly.
    24	 */
    25	.globl EXT(crosscall_arm1)
    26	EXT(crosscall_arm1):
    27		push {r4, r5, r6, r7, r8, r9, r10, r11, ip, lr}
    28		mov r4, r0
    29		mov r5, r1
    30		mov r0, r2
    31	
    32		// Because the assembler might target an earlier revision of the ISA
    33		// by default, we encode BLX as a .word.
    34		.word 0xe12fff35 // blx r5 // setg(g)
    35		.word 0xe12fff34 // blx r4 // fn()
    36	
    37		pop {r4, r5, r6, r7, r8, r9, r10, r11, ip, pc}
    38	
    39	
    40	#ifdef __ELF__
    41	.section .note.GNU-stack,"",%progbits
    42	#endif

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