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Rev 1787 Rev 2071
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#
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#
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# Copyright (C) 2001-2004 Jakub Jermar
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# Copyright (c) 2001-2004 Jakub Jermar
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# All rights reserved.
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# All rights reserved.
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#
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#
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# Redistribution and use in source and binary forms, with or without
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# modification, are permitted provided that the following conditions
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# are met:
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# are met:
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#
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#
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# - Redistributions of source code must retain the above copyright
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# - Redistributions of source code must retain the above copyright
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#   notice, this list of conditions and the following disclaimer.
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#   notice, this list of conditions and the following disclaimer.
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# - Redistributions in binary form must reproduce the above copyright
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# - Redistributions in binary form must reproduce the above copyright
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#   notice, this list of conditions and the following disclaimer in the
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#   notice, this list of conditions and the following disclaimer in the
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#   documentation and/or other materials provided with the distribution.
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#   documentation and/or other materials provided with the distribution.
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# - The name of the author may not be used to endorse or promote products
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# - The name of the author may not be used to endorse or promote products
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#   derived from this software without specific prior written permission.
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#   derived from this software without specific prior written permission.
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#
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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#
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.text
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.text
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.global context_save_arch
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.global context_save_arch
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.global context_restore_arch
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.global context_restore_arch
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#include <arch/context_offset.h>
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#include <arch/context_offset.h>
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## Save current CPU context
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## Save current CPU context
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#
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#
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# Save CPU context to context_t variable
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# Save CPU context to context_t variable
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# pointed by the 1st argument. Returns 1 in EAX.
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# pointed by the 1st argument. Returns 1 in EAX.
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#
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#
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context_save_arch:
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context_save_arch:
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	movq (%rsp), %rdx     # the caller's return %eip
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	movq (%rsp), %rdx     # the caller's return %eip
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	# In %edi is passed 1st argument
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	# In %edi is passed 1st argument
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	movq %rdx, OFFSET_PC(%rdi)
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	movq %rdx, OFFSET_PC(%rdi)
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	movq %rsp, OFFSET_SP(%rdi)
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	movq %rsp, OFFSET_SP(%rdi)
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	movq %rbx, OFFSET_RBX(%rdi)
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	movq %rbx, OFFSET_RBX(%rdi)
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	movq %rbp, OFFSET_RBP(%rdi)
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	movq %rbp, OFFSET_RBP(%rdi)
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	movq %r12, OFFSET_R12(%rdi)
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	movq %r12, OFFSET_R12(%rdi)
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	movq %r13, OFFSET_R13(%rdi)
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	movq %r13, OFFSET_R13(%rdi)
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	movq %r14, OFFSET_R14(%rdi)
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	movq %r14, OFFSET_R14(%rdi)
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	movq %r15, OFFSET_R15(%rdi)
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	movq %r15, OFFSET_R15(%rdi)
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	xorq %rax,%rax		# context_save returns 1
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	xorq %rax,%rax		# context_save returns 1
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	incq %rax
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	incq %rax
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	ret
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	ret
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## Restore current CPU context
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## Restore current CPU context
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#
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#
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# Restore CPU context from context_t variable
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# Restore CPU context from context_t variable
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# pointed by the 1st argument. Returns 0 in EAX.
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# pointed by the 1st argument. Returns 0 in EAX.
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#
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#
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context_restore_arch:
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context_restore_arch:
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	movq OFFSET_R15(%rdi), %r15
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	movq OFFSET_R15(%rdi), %r15
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	movq OFFSET_R14(%rdi), %r14
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	movq OFFSET_R14(%rdi), %r14
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	movq OFFSET_R13(%rdi), %r13
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	movq OFFSET_R13(%rdi), %r13
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	movq OFFSET_R12(%rdi), %r12
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	movq OFFSET_R12(%rdi), %r12
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	movq OFFSET_RBP(%rdi), %rbp
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	movq OFFSET_RBP(%rdi), %rbp
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	movq OFFSET_RBX(%rdi), %rbx
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	movq OFFSET_RBX(%rdi), %rbx
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	movq OFFSET_SP(%rdi), %rsp   # ctx->sp -> %rsp
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	movq OFFSET_SP(%rdi), %rsp   # ctx->sp -> %rsp
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	movq OFFSET_PC(%rdi), %rdx
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	movq OFFSET_PC(%rdi), %rdx
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	movq %rdx,(%rsp)
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	movq %rdx,(%rsp)
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	xorq %rax,%rax		# context_restore returns 0
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	xorq %rax,%rax		# context_restore returns 0
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	ret
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	ret
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