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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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#include <arch/context_offset.h>
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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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#
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#
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# Save CPU context to the context_t variable
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# Save CPU context to the 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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	movl 0(%esp),%eax	# the caller's return %eip
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	movl 0(%esp),%eax	# save pc value into eax
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	movl 4(%esp),%edx	# address of the context variable to save context to
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	movl 4(%esp),%edx	# address of the context variable to save context to
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	movl %esp,0(%edx)	# %esp -> ctx->sp
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	movl %eax,4(%edx)	# %eip -> ctx->pc
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	movl %ebx,8(%edx)	# %ebx -> ctx->ebx
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	movl %esi,12(%edx)	# %esi -> ctx->esi
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		# save registers to given structure
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	movl %edi,16(%edx)	# %edi -> ctx->edi
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	CONTEXT_SAVE_ARCH_CORE %edx %eax
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	movl %ebp,20(%edx)	# %ebp -> ctx->ebp
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	xorl %eax,%eax		# context_save returns 1
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	xorl %eax,%eax		# context_save returns 1
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	incl %eax
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	incl %eax
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	ret
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	ret
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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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	movl 4(%esp),%eax	# address of the context variable to restore context from
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	movl 4(%esp),%eax	# address of the context variable to restore context from
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	movl 0(%eax),%esp	# ctx->sp -> %esp
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	movl 4(%eax),%edx	# ctx->pc -> %edx
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	movl 8(%eax),%ebx	# ctx->ebx -> %ebx
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	movl 12(%eax),%esi	# ctx->esi -> %esi
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	movl 16(%eax),%edi	# ctx->edi -> %edi
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	movl 20(%eax),%ebp	# ctx->ebp -> %ebp
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		# restore registers from given structure
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	CONTEXT_RESTORE_ARCH_CORE %eax %edx
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	movl %edx,0(%esp)	# ctx->pc -> saver's return %eip
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	movl %edx,0(%esp)	# put saved pc on stack
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	xorl %eax,%eax		# context_restore returns 0
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	xorl %eax,%eax		# context_restore returns 0
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	ret
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	ret