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| Rev | Author | Line No. | Line |
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| 197 | palkovsky | 1 | # |
| 2 | # Copyright (C) 2001-2004 Jakub Jermar |
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| 3 | # All rights reserved. |
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| 4 | # |
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| 5 | # Redistribution and use in source and binary forms, with or without |
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| 6 | # modification, are permitted provided that the following conditions |
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| 7 | # are met: |
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| 8 | # |
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| 9 | # - Redistributions of source code must retain the above copyright |
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| 10 | # notice, this list of conditions and the following disclaimer. |
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| 11 | # - Redistributions in binary form must reproduce the above copyright |
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| 12 | # notice, this list of conditions and the following disclaimer in the |
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| 13 | # documentation and/or other materials provided with the distribution. |
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| 14 | # - The name of the author may not be used to endorse or promote products |
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| 15 | # derived from this software without specific prior written permission. |
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| 16 | # |
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| 17 | # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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| 18 | # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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| 19 | # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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| 20 | # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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| 21 | # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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| 22 | # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 23 | # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 24 | # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 25 | # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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| 26 | # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 27 | # |
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| 28 | |||
| 29 | .text |
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| 30 | |||
| 31 | .global context_save |
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| 32 | .global context_restore |
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| 33 | |||
| 34 | #include "context_offset.h" |
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| 35 | |||
| 36 | ## Save current CPU context |
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| 37 | # |
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| 38 | # Save CPU context to the kernel_context variable |
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| 39 | # pointed by the 1st argument. Returns 1 in EAX. |
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| 40 | # |
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| 41 | context_save: |
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| 42 | movq (%rsp), %rdx # the caller's return %eip |
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| 43 | # In %edi is passed 1st argument |
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| 44 | movq %rdx, OFFSET_PC(%rdi) |
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| 45 | movq %rsp, OFFSET_SP(%rdi) |
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| 46 | |||
| 47 | movq %rbx, OFFSET_RBX(%rdi) |
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| 48 | movq %rbp, OFFSET_RBP(%rdi) |
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| 49 | movq %r12, OFFSET_R12(%rdi) |
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| 50 | movq %r13, OFFSET_R13(%rdi) |
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| 51 | movq %r14, OFFSET_R14(%rdi) |
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| 52 | movq %r15, OFFSET_R15(%rdi) |
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| 53 | |||
| 54 | xorq %rax,%rax # context_save returns 1 |
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| 55 | incq %rax |
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| 56 | ret |
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| 57 | |||
| 58 | |||
| 59 | ## Restore current CPU context |
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| 60 | # |
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| 61 | # Restore CPU context from the kernel_context variable |
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| 62 | # pointed by the 1st argument. Returns 0 in EAX. |
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| 63 | # |
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| 64 | context_restore: |
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| 65 | movq OFFSET_R15(%rdi), %r15 |
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| 66 | movq OFFSET_R14(%rdi), %r14 |
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| 67 | movq OFFSET_R13(%rdi), %r13 |
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| 68 | movq OFFSET_R12(%rdi), %r12 |
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| 69 | movq OFFSET_RBP(%rdi), %rbp |
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| 70 | movq OFFSET_RBX(%rdi), %rbx |
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| 71 | |||
| 72 | movq OFFSET_SP(%rdi), %rsp # ctx->sp -> %rsp |
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| 73 | |||
| 74 | movq OFFSET_PC(%rdi), %rdx |
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| 75 | movq %rdx,(%rsp) |
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| 76 | |||
| 77 | xorq %rax,%rax # context_restore returns 0 |
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| 78 | ret |