| /* |
| * Copyright (c) 2015 Travis Geiselbrecht |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining |
| * a copy of this software and associated documentation files |
| * (the "Software"), to deal in the Software without restriction, |
| * including without limitation the rights to use, copy, modify, merge, |
| * publish, distribute, sublicense, and/or sell copies of the Software, |
| * and to permit persons to whom the Software is furnished to do so, |
| * subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be |
| * included in all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. |
| * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY |
| * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, |
| * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE |
| * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| */ |
| #include <asm.h> |
| |
| /* void x86_64_context_switch(uint64_t *oldsp, uint64_t newsp) */ |
| FUNCTION(x86_64_context_switch) |
| /* save the old context and restore the new */ |
| pushf |
| pushq %rbx |
| pushq %rbp |
| pushq %r12 |
| pushq %r13 |
| pushq %r14 |
| pushq %r15 |
| |
| movq %rsp,(%rdi) |
| movq %rsi,%rsp |
| |
| popq %r15 |
| popq %r14 |
| popq %r13 |
| popq %r12 |
| popq %rbp |
| popq %rbx |
| popf |
| |
| retq |
| |