| 0,0 → 1,87 |
|---|
| # |
| # Copyright (C) 2001-2004 Jakub Jermar |
| # All rights reserved. |
| # |
| # Redistribution and use in source and binary forms, with or without |
| # modification, are permitted provided that the following conditions |
| # are met: |
| # |
| # - Redistributions of source code must retain the above copyright |
| # notice, this list of conditions and the following disclaimer. |
| # - Redistributions in binary form must reproduce the above copyright |
| # notice, this list of conditions and the following disclaimer in the |
| # documentation and/or other materials provided with the distribution. |
| # - The name of the author may not be used to endorse or promote products |
| # derived from this software without specific prior written permission. |
| # |
| # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| # |
| |
| .text |
| |
| .global context_save |
| .global context_restore |
| |
| #include <libarch/context_offset.h> |
| |
| ## Save current CPU context |
| # |
| # Save CPU context to context_t variable |
| # pointed by the 1st argument. Returns 1 in EAX. |
| # |
| context_save: |
| movq (%rsp), %rdx # the caller's return %eip |
| # In %edi is passed 1st argument |
| movq %rdx, OFFSET_PC(%rdi) |
| movq %rsp, OFFSET_SP(%rdi) |
| |
| movq %rbx, OFFSET_RBX(%rdi) |
| movq %rbp, OFFSET_RBP(%rdi) |
| movq %r12, OFFSET_R12(%rdi) |
| movq %r13, OFFSET_R13(%rdi) |
| movq %r14, OFFSET_R14(%rdi) |
| movq %r15, OFFSET_R15(%rdi) |
| |
| # Save TLS |
| movq %fs:0, %rax |
| movq %rax, OFFSET_TLS(%rdi) |
| |
| xorq %rax,%rax # context_save returns 1 |
| incq %rax |
| ret |
| |
| |
| ## Restore current CPU context |
| # |
| # Restore CPU context from context_t variable |
| # pointed by the 1st argument. Returns 0 in EAX. |
| # |
| context_restore: |
| movq OFFSET_R15(%rdi), %r15 |
| movq OFFSET_R14(%rdi), %r14 |
| movq OFFSET_R13(%rdi), %r13 |
| movq OFFSET_R12(%rdi), %r12 |
| movq OFFSET_RBP(%rdi), %rbp |
| movq OFFSET_RBX(%rdi), %rbx |
| |
| movq OFFSET_SP(%rdi), %rsp # ctx->sp -> %rsp |
| |
| movq OFFSET_PC(%rdi), %rdx |
| movq %rdx,(%rsp) |
| |
| # Set thread local storage |
| movq OFFSET_TLS(%rdi), %rdi # Set arg1 to TLS addr |
| movq $1, %r8 |
| syscall |
| |
| xorq %rax,%rax # context_restore returns 0 |
| ret |