0,0 → 1,78 |
# |
# Copyright (C) 2001-2004 Jakub Jermar |
# All rights reserved. |
# |
# Redistribution and use in source and binary forms, with or without |
# modification, are permitted provided that the following conditions |
# are met: |
# |
# - Redistributions of source code must retain the above copyright |
# notice, this list of conditions and the following disclaimer. |
# - Redistributions in binary form must reproduce the above copyright |
# notice, this list of conditions and the following disclaimer in the |
# documentation and/or other materials provided with the distribution. |
# - The name of the author may not be used to endorse or promote products |
# derived from this software without specific prior written permission. |
# |
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
# |
|
.text |
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.global context_save |
.global context_restore |
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#include "context_offset.h" |
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## Save current CPU context |
# |
# Save CPU context to the kernel_context variable |
# pointed by the 1st argument. Returns 1 in EAX. |
# |
context_save: |
movq (%rsp), %rdx # the caller's return %eip |
# In %edi is passed 1st argument |
movq %rdx, OFFSET_PC(%rdi) |
movq %rsp, OFFSET_SP(%rdi) |
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movq %rbx, OFFSET_RBX(%rdi) |
movq %rbp, OFFSET_RBP(%rdi) |
movq %r12, OFFSET_R12(%rdi) |
movq %r13, OFFSET_R13(%rdi) |
movq %r14, OFFSET_R14(%rdi) |
movq %r15, OFFSET_R15(%rdi) |
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xorq %rax,%rax # context_save returns 1 |
incq %rax |
ret |
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## Restore current CPU context |
# |
# Restore CPU context from the kernel_context variable |
# pointed by the 1st argument. Returns 0 in EAX. |
# |
context_restore: |
movq OFFSET_R15(%rdi), %r15 |
movq OFFSET_R14(%rdi), %r14 |
movq OFFSET_R13(%rdi), %r13 |
movq OFFSET_R12(%rdi), %r12 |
movq OFFSET_RBP(%rdi), %rbp |
movq OFFSET_RBX(%rdi), %rbx |
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movq OFFSET_SP(%rdi), %rsp # ctx->sp -> %rsp |
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movq OFFSET_PC(%rdi), %rdx |
movq %rdx,(%rsp) |
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xorq %rax,%rax # context_restore returns 0 |
ret |