mirror of https://github.com/F-Stack/f-stack.git
38 lines
946 B
C
38 lines
946 B
C
/*
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* SPDX-License-Identifier: BSD-3-Clause
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* Copyright 2015 Intel Corporation.
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* Copyright 2012 Hasan Alayli <halayli@gmail.com>
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*/
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#if defined(__x86_64__)
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__asm__ (
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".text\n"
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".p2align 4,,15\n"
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".globl ctx_switch\n"
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".globl _ctx_switch\n"
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"ctx_switch:\n"
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"_ctx_switch:\n"
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" movq %rsp, 0(%rsi) # save stack_pointer\n"
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" movq %rbp, 8(%rsi) # save frame_pointer\n"
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" movq (%rsp), %rax # save insn_pointer\n"
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" movq %rax, 16(%rsi)\n"
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" movq %rbx, 24(%rsi)\n # save rbx,r12-r15\n"
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" movq 24(%rdi), %rbx\n"
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" movq %r15, 56(%rsi)\n"
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" movq %r14, 48(%rsi)\n"
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" movq 48(%rdi), %r14\n"
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" movq 56(%rdi), %r15\n"
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" movq %r13, 40(%rsi)\n"
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" movq %r12, 32(%rsi)\n"
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" movq 32(%rdi), %r12\n"
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" movq 40(%rdi), %r13\n"
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" movq 0(%rdi), %rsp # restore stack_pointer\n"
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" movq 16(%rdi), %rax # restore insn_pointer\n"
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" movq 8(%rdi), %rbp # restore frame_pointer\n"
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" movq %rax, (%rsp)\n"
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" ret\n"
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);
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#else
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#pragma GCC error "__x86_64__ is not defined"
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#endif
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