66 lines
2.1 KiB
ArmAsm
66 lines
2.1 KiB
ArmAsm
// Copyright 2019 The Marl Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#if defined(__x86_64__)
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#define MARL_BUILD_ASM 1
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#include "osfiber_asm_x64.h"
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// void marl_fiber_swap(marl_fiber_context* from, const marl_fiber_context* to)
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// rdi: from
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// rsi: to
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.text
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.global MARL_ASM_SYMBOL(marl_fiber_swap)
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.align 4
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MARL_ASM_SYMBOL(marl_fiber_swap):
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// Save context 'from'
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// Store callee-preserved registers
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movq %rbx, MARL_REG_RBX(%rdi)
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movq %rbp, MARL_REG_RBP(%rdi)
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movq %r12, MARL_REG_R12(%rdi)
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movq %r13, MARL_REG_R13(%rdi)
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movq %r14, MARL_REG_R14(%rdi)
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movq %r15, MARL_REG_R15(%rdi)
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movq (%rsp), %rcx /* call stores the return address on the stack before jumping */
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movq %rcx, MARL_REG_RIP(%rdi)
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leaq 8(%rsp), %rcx /* skip the pushed return address */
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movq %rcx, MARL_REG_RSP(%rdi)
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// Load context 'to'
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movq %rsi, %r8
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// Load callee-preserved registers
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movq MARL_REG_RBX(%r8), %rbx
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movq MARL_REG_RBP(%r8), %rbp
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movq MARL_REG_R12(%r8), %r12
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movq MARL_REG_R13(%r8), %r13
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movq MARL_REG_R14(%r8), %r14
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movq MARL_REG_R15(%r8), %r15
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// Load first two call parameters
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movq MARL_REG_RDI(%r8), %rdi
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movq MARL_REG_RSI(%r8), %rsi
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// Load stack pointer
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movq MARL_REG_RSP(%r8), %rsp
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// Load instruction pointer, and jump
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movq MARL_REG_RIP(%r8), %rcx
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jmp *%rcx
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#endif // defined(__x86_64__)
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