github.com/ice-blockchain/go/src@v0.0.0-20240403114104-1564d284e521/runtime/cgo/gcc_amd64.S (about)

     1  // Copyright 2009 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_amd64.S"
     6  
     7  /*
     8   * Apple still insists on underscore prefixes for C function names.
     9   */
    10  #if defined(__APPLE__)
    11  #define EXT(s) _##s
    12  #else
    13  #define EXT(s) s
    14  #endif
    15  
    16  /*
    17   * void crosscall1(void (*fn)(void), void (*setg_gcc)(void*), void *g)
    18   *
    19   * Calling into the gc tool chain, where all registers are caller save.
    20   * Called from standard x86-64 ABI, where %rbx, %rbp, %r12-%r15
    21   * are callee-save so they must be saved explicitly.
    22   * The standard x86-64 ABI passes the three arguments m, g, fn
    23   * in %rdi, %rsi, %rdx.
    24   */
    25  .globl EXT(crosscall1)
    26  EXT(crosscall1):
    27  	pushq %rbx
    28  	pushq %rbp
    29  	pushq %r12
    30  	pushq %r13
    31  	pushq %r14
    32  	pushq %r15
    33  
    34  #if defined(_WIN64)
    35  	movq %r8, %rdi	/* arg of setg_gcc */
    36  	call *%rdx	/* setg_gcc */
    37  	call *%rcx	/* fn */
    38  #else
    39  	movq %rdi, %rbx
    40  	movq %rdx, %rdi	/* arg of setg_gcc */
    41  	call *%rsi	/* setg_gcc */
    42  	call *%rbx	/* fn */
    43  #endif
    44  
    45  	popq %r15
    46  	popq %r14
    47  	popq %r13
    48  	popq %r12
    49  	popq %rbp
    50  	popq %rbx
    51  	ret
    52  
    53  #ifdef __ELF__
    54  .section .note.GNU-stack,"",@progbits
    55  #endif