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Rev 125 Rev 312
Line 36... Line 36...
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#
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#
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# Save CPU context to the kernel_context variable
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# Save CPU context to the kernel_context 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:
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context_save:
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	push %ebx
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	movl 0(%esp),%eax	# the caller's return %eip
- 
 
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	movl 4(%esp),%edx	# address of the kernel_context variable to save context to
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	movl 4(%esp),%eax	# the caller's return %eip
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	movl %esp,0(%edx)	# %esp -> ctx->sp
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	movl 8(%esp),%ebx	# address of the kernel_context variable to save context to
 - 
 
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	movl %eax,4(%ebx)	# %eip -> ctx->pc
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	movl %eax,4(%edx)	# %eip -> ctx->pc
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	movl %esp,(%ebx)	# %esp -> ctx->sp
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	movl %ebx,8(%edx)	# %ebx -> ctx->ebx
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 - 
 
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	movl %ebx,%eax
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	pop %ebx
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 - 
 
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	movl %ebx,8(%eax)
 - 
 
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	movl %ecx,12(%eax)
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	movl %esi,12(%edx)	# %esi -> ctx->esi
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	movl %edx,16(%eax)
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	movl %edi,16(%edx)	# %edi -> ctx->edi
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	movl %esi,20(%eax)
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	movl %edi,24(%eax)
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	movl %ebp,28(%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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Line 65... Line 58...
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# Restore CPU context from the kernel_context variable
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# Restore CPU context from the kernel_context 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:
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context_restore:
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	movl 4(%esp),%eax	# address of the kernel_context variable to restore context from
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	movl 4(%esp),%eax	# address of the kernel_context variable to restore context from
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	movl (%eax),%esp	# ctx->sp -> %esp
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	movl 0(%eax),%esp	# ctx->sp -> %esp
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	addl $4,%esp		# this is for the pop we don't do
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	movl 4(%eax),%edx	# ctx->pc -> %edx
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 - 
 
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	movl 8(%eax),%ebx
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	movl 8(%eax),%ebx	# ctx->ebx -> %ebx
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	movl 12(%eax),%ecx
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	movl 12(%eax),%esi	# ctx->esi -> %esi
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	movl 16(%eax),%edx
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	movl 16(%eax),%edi	# ctx->edi -> %edi
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	movl 20(%eax),%esi
 - 
 
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	movl 24(%eax),%edi
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	movl 28(%eax),%ebp
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	movl 20(%eax),%ebp	# ctx->ebp -> %ebp
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	movl 4(%eax),%eax
 - 
 
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	movl %eax,(%esp)	# ctx->pc -> saver's return %eip
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	movl %edx,0(%esp)	# ctx->pc -> saver's return %eip
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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