1// Copyright 2019 The Marl Authors. 2// 3// Licensed under the Apache License, Version 2.0 (the "License"); 4// you may not use this file except in compliance with the License. 5// You may obtain a copy of the License at 6// 7// https://www.apache.org/licenses/LICENSE-2.0 8// 9// Unless required by applicable law or agreed to in writing, software 10// distributed under the License is distributed on an "AS IS" BASIS, 11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12// See the License for the specific language governing permissions and 13// limitations under the License. 14 15#if defined(__x86_64__) 16 17#define MARL_BUILD_ASM 1 18#include "osfiber_asm_x64.h" 19 20// void marl_fiber_swap(marl_fiber_context* from, const marl_fiber_context* to) 21// rdi: from 22// rsi: to 23.text 24.global MARL_ASM_SYMBOL(marl_fiber_swap) 25.align 4 26MARL_ASM_SYMBOL(marl_fiber_swap): 27 28 // Save context 'from' 29 30 // Store callee-preserved registers 31 movq %rbx, MARL_REG_RBX(%rdi) 32 movq %rbp, MARL_REG_RBP(%rdi) 33 movq %r12, MARL_REG_R12(%rdi) 34 movq %r13, MARL_REG_R13(%rdi) 35 movq %r14, MARL_REG_R14(%rdi) 36 movq %r15, MARL_REG_R15(%rdi) 37 38 movq (%rsp), %rcx /* call stores the return address on the stack before jumping */ 39 movq %rcx, MARL_REG_RIP(%rdi) 40 leaq 8(%rsp), %rcx /* skip the pushed return address */ 41 movq %rcx, MARL_REG_RSP(%rdi) 42 43 // Load context 'to' 44 movq %rsi, %r8 45 46 // Load callee-preserved registers 47 movq MARL_REG_RBX(%r8), %rbx 48 movq MARL_REG_RBP(%r8), %rbp 49 movq MARL_REG_R12(%r8), %r12 50 movq MARL_REG_R13(%r8), %r13 51 movq MARL_REG_R14(%r8), %r14 52 movq MARL_REG_R15(%r8), %r15 53 54 // Load first two call parameters 55 movq MARL_REG_RDI(%r8), %rdi 56 movq MARL_REG_RSI(%r8), %rsi 57 58 // Load stack pointer 59 movq MARL_REG_RSP(%r8), %rsp 60 61 // Load instruction pointer, and jump 62 movq MARL_REG_RIP(%r8), %rcx 63 jmp *%rcx 64 65#endif // defined(__x86_64__) 66