| // 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 |
