x86/entry/entry_32.S

13  *	 0(%esp) - %ebx
14  *	 4(%esp) - %ecx
15  *	 8(%esp) - %edx
16  *	 C(%esp) - %esi
17  *	10(%esp) - %edi
18  *	14(%esp) - %ebp
19  *	18(%esp) - %eax
20  *	1C(%esp) - %ds
21  *	20(%esp) - %es
22  *	24(%esp) - %fs
23  *	28(%esp) - unused -- was %gs on old stackprotector kernels
24  *	2C(%esp) - orig_eax
25  *	30(%esp) - %eip
26  *	34(%esp) - %cs
27  *	38(%esp) - %eflags
28  *	3C(%esp) - %oldesp
29  *	40(%esp) - %oldss
71 	testl	$USER_SEGMENT_RPL_MASK, PT_CS(%esp)
111 	andl	$0x0000ffff, 4*4(%esp)
114 	testl	$X86_EFLAGS_VM, 5*4(%esp)
117 	testl	$USER_SEGMENT_RPL_MASK, 4*4(%esp)
120 	orl	$CS_FROM_KERNEL, 4*4(%esp)
125 	 *  6*4(%esp) - <previous context>
126 	 *  5*4(%esp) - flags
127 	 *  4*4(%esp) - cs
128 	 *  3*4(%esp) - ip
129 	 *  2*4(%esp) - orig_eax
130 	 *  1*4(%esp) - gs / function
131 	 *  0*4(%esp) - fs
137 	 * 14*4(%esp) - <previous context>
138 	 * 13*4(%esp) - gap / flags
139 	 * 12*4(%esp) - gap / cs
140 	 * 11*4(%esp) - gap / ip
141 	 * 10*4(%esp) - gap / orig_eax
142 	 *  9*4(%esp) - gap / gs / function
143 	 *  8*4(%esp) - gap / fs
144 	 *  7*4(%esp) - ss
145 	 *  6*4(%esp) - sp
146 	 *  5*4(%esp) - flags
147 	 *  4*4(%esp) - cs
148 	 *  3*4(%esp) - ip
149 	 *  2*4(%esp) - orig_eax
150 	 *  1*4(%esp) - gs / function
151 	 *  0*4(%esp) - fs
155 	pushl	%esp		# sp (points at ss)
156 	addl	$7*4, (%esp)	# point sp back at the previous context
157 	pushl	7*4(%esp)	# flags
158 	pushl	7*4(%esp)	# cs
159 	pushl	7*4(%esp)	# ip
160 	pushl	7*4(%esp)	# orig_eax
161 	pushl	7*4(%esp)	# gs / function
162 	pushl	7*4(%esp)	# fs
172 	 * accesses through %esp, which automatically use SS.)
174 	testl $CS_FROM_KERNEL, 1*4(%esp)
179 	 * regs->sp without lowering %esp in between, such that an NMI in the
184 	movl	5*4(%esp), %eax		# (modified) regs->sp
186 	movl	4*4(%esp), %ecx		# flags
189 	movl	3*4(%esp), %ecx		# cs
193 	movl	2*4(%esp), %ecx		# ip
196 	movl	1*4(%esp), %ecx		# eax
200 	lea	-4*4(%eax), %esp
271 4:	addl	$(4 + \pop), %esp	/* pop the unused "gs" slot */
312 	movl	PT_EFLAGS(%esp), %eax		# mix EFLAGS, SS and CS
314 	 * Warning: PT_OLDSS(%esp) contains the wrong/random values if we
318 	movb	PT_OLDSS(%esp), %ah
319 	movb	PT_CS(%esp), %al
335 	mov	%esp, %edx			/* load kernel esp */
336 	mov	PT_OLDESP(%esp), %eax		/* load userspace esp */
337 	mov	%dx, %ax			/* eax: new kernel esp */
343 	pushl	%eax				/* new kernel esp */
350 	lss	(%esp), %esp			/* switch to espfix segment */
359  * We need to be very careful here with the %esp switch, because an NMI
380 	subl	%esp, %ecx	/* ecx = (end of entry_stack) - esp */
385 	movl	%esp, %esi
397 	movl	PT_EFLAGS(%esp), %ecx		# mix EFLAGS and CS
398 	movb	PT_CS(%esp), %cl
401 	movl	PT_CS(%esp), %ecx
427 	movl	%edi, %esp
443 	 * kernel-mode and %esp points to the entry-stack. When this
464 	 * %esi: Entry-Stack pointer (same as %esp)
480 	orl	$CS_FROM_ENTRY_STACK, PT_CS(%esp)
488 	orl	$CS_FROM_USER_CR3, PT_CS(%esp)
503  * The %esp register must point to pt_regs on the task stack. It will
520 	testl	$(X86_EFLAGS_VM), PT_EFLAGS(%esp)
532 	movl	%esp, %esi
547 	movl	%ebx, %esp
566 	testl	$CS_FROM_ENTRY_STACK, PT_CS(%esp)
572 	andl	$(~CS_FROM_ENTRY_STACK), PT_CS(%esp)
575 	movl	%esp, %esi
598 	movl	%ebx, %esp
604 	testl	$CS_FROM_USER_CR3, PT_CS(%esp)
608 	andl	$(~CS_FROM_USER_CR3), PT_CS(%esp)
644 	movl	%esp, %eax
645 	movl	PT_ORIG_EAX(%esp), %edx		/* get the vector from stack */
646 	movl	$-1, PT_ORIG_EAX(%esp)		/* no syscall to restart */
689 	movl	%esp, TASK_threadsp(%eax)
690 	movl	TASK_threadsp(%edx), %esp
727 	movl	%esp, %edx	/* regs */
737 	addl	$4, %esp
800 	movl	TSS_entry2task_stack(%esp), %esp
830 	testl	$X86_EFLAGS_NT|X86_EFLAGS_AC|X86_EFLAGS_TF, PT_EFLAGS(%esp)
834 	movl	%esp, %eax
853 	movl	PT_EFLAGS(%esp), %edi
854 	movl	PT_EAX(%esp), %esi
859 	movl	PT_EIP(%esp), %edx	/* pt_regs->ip */
860 	movl	PT_OLDESP(%esp), %ecx	/* pt_regs->sp */
861 1:	mov	PT_FS(%esp), %fs
864 	addl	$2*4, %esp		/* skip pt_regs->cx and pt_regs->dx */
870 	movl	%eax, %esp
880 	btrl	$X86_EFLAGS_IF_BIT, (%esp)
893 2:	movl    $0, PT_FS(%esp)
938 	movl	%esp, %eax
999 	subl	$2*4, %esp
1000 	sgdt	(%esp)
1001 	movl	2(%esp), %ecx				/* GDT address */
1009 	addl	$2*4, %esp
1011 	addl	%esp, %eax			/* the adjusted stack pointer */
1014 	lss	(%esp), %esp			/* switch to the normal stack segment */
1036 	movl	PT_GS(%esp), %edi		# get the function address
1039 	movl	PT_ORIG_EAX(%esp), %edx		# get the error code
1040 	movl	$-1, PT_ORIG_EAX(%esp)		# no syscall to restart
1042 	movl	%esp, %eax			# pt_regs pointer
1047 	movl	PT_EFLAGS(%esp), %eax		# mix EFLAGS and CS
1048 	movb	PT_CS(%esp), %al
1054 	movl	PT_CS(%esp), %eax
1066 	movl	%esp, %eax
1136 	movl	%esp, %eax			# pt_regs pointer
1141 	subl	%eax, %ecx	/* ecx = (end of entry_stack) - esp */
1155 	movl	%esp, %ebx
1156 	movl	PER_CPU_VAR(pcpu_hot + X86_top_of_stack), %esp
1158 	movl	%ebx, %esp
1162 	testl	$CS_FROM_ESPFIX, PT_CS(%esp)
1176 	pushl	%esp
1177 	addl	$4, (%esp)
1180 	pushl	4*4(%esp)	# flags
1181 	pushl	4*4(%esp)	# cs
1182 	pushl	4*4(%esp)	# ip
1190 	xorl	$(CS_FROM_ESPFIX | CS_FROM_KERNEL), PT_CS(%esp)
1193 	movl	%esp, %eax			# pt_regs pointer
1208 	lss	(1+5+6)*4(%esp), %esp			# back to espfix stack
1219 	leal	-TOP_OF_KERNEL_STACK_PADDING-PTREGS_SIZE(%esi), %esp