github.com/tcnksm/go@v0.0.0-20141208075154-439b32936367/src/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_arm1(void (*fn)(void), void (*setg_gcc)(void *g), void *g)
    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_arm1)
    22  EXT(crosscall_arm1):
    23  	push {r4, r5, r6, r7, r8, r9, r10, r11, ip, lr}
    24  	mov r4, r0
    25  	mov r5, r1
    26  	mov r0, r2
    27  
    28  	// Because the assembler might target an earlier revision of the ISA
    29  	// by default, we encode BLX as a .word.
    30  	.word 0xe12fff35 // blx r5 // setg(g)
    31  	.word 0xe12fff34 // blx r4 // fn()
    32  
    33  	pop {r4, r5, r6, r7, r8, r9, r10, r11, ip, pc}
    34  
    35  .globl EXT(__stack_chk_fail_local)
    36  EXT(__stack_chk_fail_local):
    37  1:
    38  	b 1b
    39  
    40  #ifdef __ELF__
    41  .section .note.GNU-stack,"",%progbits
    42  #endif