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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 1 | jermar | 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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| 50 | jermar | 33 | .global fpu_context_save |
| 34 | .global fpu_context_restore |
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| 35 | .global fpu_lazy_context_save |
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| 36 | .global fpu_lazy_context_restore |
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| 1 | jermar | 37 | |
| 65 | decky | 38 | |
| 39 | ## Save current CPU context |
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| 1 | jermar | 40 | # |
| 65 | decky | 41 | # Save CPU context to the kernel_context variable |
| 42 | # pointed by the 1st argument. Returns 1 in EAX. |
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| 43 | # |
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| 1 | jermar | 44 | context_save: |
| 45 | push %ebx |
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| 46 | |||
| 47 | movl 4(%esp),%eax # the caller's return %eip |
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| 48 | movl 8(%esp),%ebx # address of the kernel_context variable to save context to |
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| 49 | movl %eax,4(%ebx) # %eip -> ctx->pc |
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| 50 | movl %esp,(%ebx) # %esp -> ctx->sp |
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| 51 | |||
| 52 | movl %ebx,%eax |
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| 53 | pop %ebx |
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| 54 | |||
| 55 | movl %ebx,8(%eax) |
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| 56 | movl %ecx,12(%eax) |
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| 57 | movl %edx,16(%eax) |
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| 58 | movl %esi,20(%eax) |
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| 59 | movl %edi,24(%eax) |
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| 60 | movl %ebp,28(%eax) |
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| 61 | |||
| 62 | xorl %eax,%eax # context_save returns 1 |
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| 63 | incl %eax |
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| 64 | ret |
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| 65 | decky | 65 | |
| 66 | |||
| 67 | ## Restore current CPU context |
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| 1 | jermar | 68 | # |
| 65 | decky | 69 | # Restore CPU context from the kernel_context variable |
| 70 | # pointed by the 1st argument. Returns 0 in EAX. |
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| 71 | # |
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| 1 | jermar | 72 | context_restore: |
| 73 | movl 4(%esp),%eax # address of the kernel_context variable to restore context from |
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| 74 | movl (%eax),%esp # ctx->sp -> %esp |
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| 75 | addl $4,%esp # this is for the pop we don't do |
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| 76 | |||
| 77 | movl 8(%eax),%ebx |
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| 78 | movl 12(%eax),%ecx |
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| 79 | movl 16(%eax),%edx |
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| 80 | movl 20(%eax),%esi |
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| 81 | movl 24(%eax),%edi |
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| 82 | movl 28(%eax),%ebp |
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| 83 | |||
| 84 | movl 4(%eax),%eax |
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| 85 | movl %eax,(%esp) # ctx->pc -> saver's return %eip |
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| 86 | xorl %eax,%eax # context_restore returns 0 |
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| 87 | ret |