github.com/ice-blockchain/go/src@v0.0.0-20240403114104-1564d284e521/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  .file "gcc_arm.S"
     6  
     7  /*
     8   * void crosscall1(void (*fn)(void), void (*setg_gcc)(void *g), void *g)
     9   *
    10   * Calling into the gc tool chain, where all registers are caller save.
    11   * Called from standard ARM EABI, where r4-r11 are callee-save, so they
    12   * must be saved explicitly.
    13   */
    14  .globl crosscall1
    15  crosscall1:
    16  	push {r4, r5, r6, r7, r8, r9, r10, r11, ip, lr}
    17  	mov r4, r0
    18  	mov r5, r1
    19  	mov r0, r2
    20  
    21  	// Because the assembler might target an earlier revision of the ISA
    22  	// by default, we encode BLX as a .word.
    23  	.word 0xe12fff35 // blx r5 // setg(g)
    24  	.word 0xe12fff34 // blx r4 // fn()
    25  
    26  	pop {r4, r5, r6, r7, r8, r9, r10, r11, ip, pc}
    27  
    28  
    29  #ifdef __ELF__
    30  .section .note.GNU-stack,"",%progbits
    31  #endif