极简的swapcontext实现

2015-04-18

context.h

    #ifndef _CONTEXT_H
    #define _CONTEXT_H	
    
    struct Context {
        uint64_t rsp;
        uint64_t r15;
        uint64_t r14;
        uint64_t r13;
        uint64_t r12;
        uint64_t rbx;
        uint64_t rbp;
    };
    void SwapContext(struct Context *old, struct Context *new);

context.s

    .globl _SwapContext, SwapContext
    _SwapContext:
    SwapContext:
    
            mov     %rsp, 0x00(%rdi)
            mov     %r15, 0x08(%rdi)
            mov     %r14, 0x10(%rdi)
            mov     %r13, 0x18(%rdi)
            mov     %r12, 0x20(%rdi)
            mov     %rbx, 0x28(%rdi)
            mov     %rbp, 0x30(%rdi)
        
            mov     0x00(%rsi), %rsp
            mov     0x08(%rsi), %r15
            mov     0x10(%rsi), %r14
            mov     0x18(%rsi), %r13
            mov     0x20(%rsi), %r12
            mov     0x28(%rsi), %rbx
            mov     0x30(%rsi), %rbp
        
            ret