Go to most recent revision | Details | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 1113 | palkovsky | 1 | # |
| 2 | # Copyright (C) 2001-2004 Jakub Jermar |
||
| 3 | # All rights reserved. |
||
| 4 | # |
||
| 5 | # Redistribution and use in source and binary forms, with or without |
||
| 6 | # modification, are permitted provided that the following conditions |
||
| 7 | # are met: |
||
| 8 | # |
||
| 9 | # - Redistributions of source code must retain the above copyright |
||
| 10 | # notice, this list of conditions and the following disclaimer. |
||
| 11 | # - Redistributions in binary form must reproduce the above copyright |
||
| 12 | # notice, this list of conditions and the following disclaimer in the |
||
| 13 | # documentation and/or other materials provided with the distribution. |
||
| 14 | # - The name of the author may not be used to endorse or promote products |
||
| 15 | # derived from this software without specific prior written permission. |
||
| 16 | # |
||
| 17 | # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
||
| 18 | # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
||
| 19 | # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
||
| 20 | # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
||
| 21 | # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
||
| 22 | # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
||
| 23 | # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
||
| 24 | # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
||
| 25 | # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
||
| 26 | # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
||
| 27 | # |
||
| 28 | |||
| 29 | .text |
||
| 30 | |||
| 31 | .global context_save |
||
| 32 | .global context_restore |
||
| 33 | |||
| 34 | #include <libarch/context_offset.h> |
||
| 35 | |||
| 36 | ## Save current CPU context |
||
| 37 | # |
||
| 38 | # Save CPU context to context_t variable |
||
| 39 | # pointed by the 1st argument. Returns 1 in EAX. |
||
| 40 | # |
||
| 41 | context_save: |
||
| 42 | movq (%rsp), %rdx # the caller's return %eip |
||
| 43 | # In %edi is passed 1st argument |
||
| 44 | movq %rdx, OFFSET_PC(%rdi) |
||
| 45 | movq %rsp, OFFSET_SP(%rdi) |
||
| 46 | |||
| 47 | movq %rbx, OFFSET_RBX(%rdi) |
||
| 48 | movq %rbp, OFFSET_RBP(%rdi) |
||
| 49 | movq %r12, OFFSET_R12(%rdi) |
||
| 50 | movq %r13, OFFSET_R13(%rdi) |
||
| 51 | movq %r14, OFFSET_R14(%rdi) |
||
| 52 | movq %r15, OFFSET_R15(%rdi) |
||
| 53 | |||
| 54 | # Save TLS |
||
| 55 | movq %fs:0, %rax |
||
| 56 | movq %rax, OFFSET_TLS(%rdi) |
||
| 57 | |||
| 58 | xorq %rax,%rax # context_save returns 1 |
||
| 59 | incq %rax |
||
| 60 | ret |
||
| 61 | |||
| 62 | |||
| 63 | ## Restore current CPU context |
||
| 64 | # |
||
| 65 | # Restore CPU context from context_t variable |
||
| 66 | # pointed by the 1st argument. Returns 0 in EAX. |
||
| 67 | # |
||
| 68 | context_restore: |
||
| 69 | movq OFFSET_R15(%rdi), %r15 |
||
| 70 | movq OFFSET_R14(%rdi), %r14 |
||
| 71 | movq OFFSET_R13(%rdi), %r13 |
||
| 72 | movq OFFSET_R12(%rdi), %r12 |
||
| 73 | movq OFFSET_RBP(%rdi), %rbp |
||
| 74 | movq OFFSET_RBX(%rdi), %rbx |
||
| 75 | |||
| 76 | movq OFFSET_SP(%rdi), %rsp # ctx->sp -> %rsp |
||
| 77 | |||
| 78 | movq OFFSET_PC(%rdi), %rdx |
||
| 79 | movq %rdx,(%rsp) |
||
| 80 | |||
| 81 | # Set thread local storage |
||
| 82 | movq OFFSET_TLS(%rdi), %rdi # Set arg1 to TLS addr |
||
| 83 | movq $1, %r8 |
||
| 84 | syscall |
||
| 85 | |||
| 86 | xorq %rax,%rax # context_restore returns 0 |
||
| 87 | ret |