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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 1 | jermar | 1 | # |
| 2071 | jermar | 2 | # Copyright (c) 2001-2004 Jakub Jermar |
| 1 | jermar | 3 | # All rights reserved. |
| 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 | |||
| 2775 | cejka | 29 | #include <arch/context_offset.h> |
| 30 | |||
| 1 | jermar | 31 | .text |
| 32 | |||
| 414 | jermar | 33 | .global context_save_arch |
| 34 | .global context_restore_arch |
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| 1 | jermar | 35 | |
| 65 | decky | 36 | |
| 37 | ## Save current CPU context |
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| 1 | jermar | 38 | # |
| 414 | jermar | 39 | # Save CPU context to the context_t variable |
| 65 | decky | 40 | # pointed by the 1st argument. Returns 1 in EAX. |
| 41 | # |
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| 414 | jermar | 42 | context_save_arch: |
| 2775 | cejka | 43 | movl 0(%esp),%eax # save pc value into eax |
| 44 | movl 4(%esp),%edx # address of the context variable to save context to |
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| 1 | jermar | 45 | |
| 2775 | cejka | 46 | # save registers to given structure |
| 47 | CONTEXT_SAVE_ARCH_CORE %edx %eax |
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| 1 | jermar | 48 | |
| 49 | xorl %eax,%eax # context_save returns 1 |
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| 50 | incl %eax |
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| 51 | ret |
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| 65 | decky | 52 | |
| 53 | |||
| 414 | jermar | 54 | ## Restore saved CPU context |
| 1 | jermar | 55 | # |
| 414 | jermar | 56 | # Restore CPU context from context_t variable |
| 65 | decky | 57 | # pointed by the 1st argument. Returns 0 in EAX. |
| 125 | jermar | 58 | # |
| 414 | jermar | 59 | context_restore_arch: |
| 2482 | jermar | 60 | movl 4(%esp),%eax # address of the context variable to restore context from |
| 1 | jermar | 61 | |
| 2775 | cejka | 62 | # restore registers from given structure |
| 63 | CONTEXT_RESTORE_ARCH_CORE %eax %edx |
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| 64 | |||
| 65 | movl %edx,0(%esp) # put saved pc on stack |
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| 125 | jermar | 66 | xorl %eax,%eax # context_restore returns 0 |
| 1 | jermar | 67 | ret |