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- | 1 | # |
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- | 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_arch |
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- | 32 | .global context_restore_arch |
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- | 33 | ||
- | 34 | ||
- | 35 | ## Save current CPU context |
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- | 36 | # |
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- | 37 | # Save CPU context to the context_t variable |
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- | 38 | # pointed by the 1st argument. Returns 1 in EAX. |
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- | 39 | # |
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- | 40 | context_save_arch: |
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- | 41 | movl 0(%esp),%eax # the caller's return %eip |
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- | 42 | movl 4(%esp),%edx # address of the kernel_context variable to save context to |
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- | 43 | ||
- | 44 | movl %esp,0(%edx) # %esp -> ctx->sp |
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- | 45 | movl %eax,4(%edx) # %eip -> ctx->pc |
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- | 46 | movl %ebx,8(%edx) # %ebx -> ctx->ebx |
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- | 47 | movl %esi,12(%edx) # %esi -> ctx->esi |
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- | 48 | movl %edi,16(%edx) # %edi -> ctx->edi |
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- | 49 | movl %ebp,20(%edx) # %ebp -> ctx->ebp |
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- | 50 | ||
- | 51 | xorl %eax,%eax # context_save returns 1 |
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- | 52 | incl %eax |
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- | 53 | ret |
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- | 54 | ||
- | 55 | ||
- | 56 | ## Restore saved CPU context |
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- | 57 | # |
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- | 58 | # Restore CPU context from context_t variable |
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- | 59 | # pointed by the 1st argument. Returns 0 in EAX. |
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- | 60 | # |
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- | 61 | context_restore_arch: |
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- | 62 | movl 4(%esp),%eax # address of the kernel_context variable to restore context from |
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- | 63 | movl 0(%eax),%esp # ctx->sp -> %esp |
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- | 64 | movl 4(%eax),%edx # ctx->pc -> %edx |
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- | 65 | movl 8(%eax),%ebx # ctx->ebx -> %ebx |
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- | 66 | movl 12(%eax),%esi # ctx->esi -> %esi |
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- | 67 | movl 16(%eax),%edi # ctx->edi -> %edi |
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- | 68 | movl 20(%eax),%ebp # ctx->ebp -> %ebp |
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- | 69 | ||
- | 70 | movl %edx,0(%esp) # ctx->pc -> saver's return %eip |
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- | 71 | xorl %eax,%eax # context_restore returns 0 |
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- | 72 | ret |