#if defined(__x86_64__)
__asm__ (
".text\n"
".p2align 4,,15\n"
".globl ctx_switch\n"
".globl _ctx_switch\n"
"ctx_switch:\n"
"_ctx_switch:\n"
" movq %rsp, 0(%rsi) # save stack_pointer\n"
" movq %rbp, 8(%rsi) # save frame_pointer\n"
" movq (%rsp), %rax # save insn_pointer\n"
" movq %rax, 16(%rsi)\n"
" movq %rbx, 24(%rsi)\n # save rbx,r12-r15\n"
" movq 24(%rdi), %rbx\n"
" movq %r15, 56(%rsi)\n"
" movq %r14, 48(%rsi)\n"
" movq 48(%rdi), %r14\n"
" movq 56(%rdi), %r15\n"
" movq %r13, 40(%rsi)\n"
" movq %r12, 32(%rsi)\n"
" movq 32(%rdi), %r12\n"
" movq 40(%rdi), %r13\n"
" movq 0(%rdi), %rsp # restore stack_pointer\n"
" movq 16(%rdi), %rax # restore insn_pointer\n"
" movq 8(%rdi), %rbp # restore frame_pointer\n"
" movq %rax, (%rsp)\n"
" ret\n"
);
#else
#pragma GCC error "__x86_64__ is not defined"
#endif
