github.com/xushiwei/go@v0.0.0-20130601165731-2b9d83f45bc9/src/pkg/runtime/cgo/gcc_arm.S (about)

     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  /*
    15   * void crosscall_arm2(void (*fn)(void), void *g, void *m)
    16   *
    17   * Calling into the 5c tool chain, where all registers are caller save.
    18   * Called from standard ARM EABI, where r4-r11 are callee-save, so they
    19   * must be saved explicitly.
    20   */
    21  .globl EXT(crosscall_arm2)
    22  EXT(crosscall_arm2):
    23  	push {r4, r5, r6, r7, r8, r9, r10, r11, ip, lr}
    24  	mov r10, r1 // g
    25  	mov r9, r2 // m
    26  	mov r3, r0 // save r0, cgo_tls_set_gm will clobber it
    27  	bl EXT(x_cgo_save_gm) // save current g and m into TLS variable
    28  	mov lr, pc
    29  	mov pc, r3
    30  	pop {r4, r5, r6, r7, r8, r9, r10, r11, ip, pc}
    31  
    32  .globl EXT(__stack_chk_fail_local)
    33  EXT(__stack_chk_fail_local):
    34  1:
    35  	b 1b
    36  
    37  #ifdef __ELF__
    38  .section .note.GNU-stack,"",%progbits
    39  #endif