1 // Copyright 2015 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 crosscall1(void (*fn)(void), void (*setg_gcc)(void *g), void *g) 20 * 21 * Calling into the gc tool chain, where all registers are caller save. 22 * Called from standard ARM EABI, where x19-x29 are callee-save, so they 23 * must be saved explicitly, along with x30 (LR). 24 */ 25 .globl EXT(crosscall1) 26 EXT(crosscall1): 27 stp x19, x20, [sp, #-16]! 28 stp x21, x22, [sp, #-16]! 29 stp x23, x24, [sp, #-16]! 30 stp x25, x26, [sp, #-16]! 31 stp x27, x28, [sp, #-16]! 32 stp x29, x30, [sp, #-16]! 33 mov x29, sp 34 35 mov x19, x0 36 mov x20, x1 37 mov x0, x2 38 39 blr x20 40 blr x19 41 42 ldp x29, x30, [sp], #16 43 ldp x27, x28, [sp], #16 44 ldp x25, x26, [sp], #16 45 ldp x23, x24, [sp], #16 46 ldp x21, x22, [sp], #16 47 ldp x19, x20, [sp], #16 48 ret 49 50 51 #ifdef __ELF__ 52 .section .note.GNU-stack,"",%progbits 53 #endif 54
