#
# 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.
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# - The name of the author may not be used to endorse or promote products
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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#include <arch/context_offset.h>

.text

.global context_save_arch
.global context_restore_arch


## Save current CPU context
#
# Save CPU context to the context_t variable
# pointed by the 1st argument. Returns 1 in EAX.
#
context_save_arch:
	movl 0(%esp),%eax	# save pc value into eax	
	movl 4(%esp),%edx	# address of the context variable to save context to 

		# save registers to given structure
	CONTEXT_SAVE_ARCH_CORE %edx %eax

	xorl %eax,%eax		# context_save returns 1
	incl %eax
	ret


## Restore saved CPU context
#
# Restore CPU context from context_t variable
# pointed by the 1st argument. Returns 0 in EAX.
#
context_restore_arch:
	movl 4(%esp),%eax	# address of the context variable to restore context from

		# restore registers from given structure
	CONTEXT_RESTORE_ARCH_CORE %eax %edx

	movl %edx,0(%esp)	# put saved pc on stack
	xorl %eax,%eax		# context_restore returns 0
	ret