osfmk/i386/idt.s

500  *	user esp - if from user
513 	movl	%esp,%ebx
534 	movl	%ebx,%esp		/* switch to hi based PCB stack */
555         addl    $8,%esp                 /* discard trap number and error code */
557         cmpl    $(SYSENTER_CS),4(%esp)  /* test for fast entry/exit */
564 	andl	$(~EFL_IF),(%esp)	/* clear intrs enabled, see sti below */
566 	popl	%ecx			/* user return esp */
606 	movl	(%esp), %esp		/* switch from intr stack to pcb */
626 	orl	$(EFL_IF),R32_EFLAGS-R32_EDI(%esp)	/* (edi was last reg pushed) */
652 	testb	$3,R32_CS(%esp)
654 	movl	%esp,%edx			/* came from user mode */
659 	movl	%edx,%esp
665 	movl	R32_TRAPNO(%esp),%ecx			// Get the interrupt vector
677 	movl	%eax,R32_CR2-R32_EDI(%esp)/* save in esp save slot */
691 	testb	$3,4(%esp)
694 	cmpl	$(HI_TEXT(hi_mach_scall)),(%esp)
696 	addl	$12,%esp		/* remove eip/cs/eflags from debug_trap */
699 	cmpl	$(HI_TEXT(hi_mdep_scall)),(%esp)
701 	addl	$12,%esp		/* remove eip/cs/eflags from debug_trap */
704 	cmpl	$(HI_TEXT(hi_unix_scall)),(%esp)
706 	addl	$12,%esp		/* remove eip/cs/eflags from debug_trap */
709 	cmpl	$(HI_TEXT(hi_sysenter)),(%esp)
720 	addl	$8,%esp			/* remove eip/cs */
722 	movl	8(%esp),%ecx		/* top of intr stack -> pcb stack */
723 	xchgl	%ecx,%esp		/* switch to pcb stack */
744  * esp->     0:	trap code (NP or GP)
759 	testb	$3,12(%esp)
763 	cmpl	$(HI_TEXT(ret_iret)),8(%esp)	/* on IRET? */
765 	cmpl	$(HI_TEXT(ret_popl_ds)),8(%esp)	/* popping DS? */
767 	cmpl	$(HI_TEXT(ret_popl_es)),8(%esp)	/* popping ES? */
769 	cmpl	$(HI_TEXT(ret_popl_fs)),8(%esp)	/* popping FS? */
771 	cmpl	$(HI_TEXT(ret_popl_gs)),8(%esp)	/* popping GS? */
792  * 32	user esp
796 	movl	%eax,8(%esp)		/* save eax (we don`t need saved eip) */
798 	movl	%eax,12-4(%esp)		/* put in user trap number */
800 	movl	%eax,16-8(%esp)		/* put in user errcode */
815 	addl	$12,%esp		/* pop stack to user regs */
820 	addl	$12,%esp		/* pop stack to user regs */
825 	addl	$12,%esp		/* pop stack to user regs */
830 	addl	$12,%esp		/* pop stack to user regs */
841 	movl	%eax,R32_TRAPNO(%esp)	/* set trap number */
842 	movl	%edx,R32_ERR(%esp)	/* set error code */
858  *	esp	-> x86_saved_state_t
862  *	esp	 -> low based stack
871 	movl	R32_CS(%esp),%eax	/* assume 32-bit state */
872 	cmpl	$(SS_64),SS_FLAVOR(%esp)/* 64-bit? */
874 	movl	R64_CS(%esp),%eax	/* 64-bit user mode */
888 	xchgl	%ebx,%esp		/* switch to kernel stack */
900 	movl	%gs:CPU_ACTIVE_THREAD, %esp
901 	movl	TH_PCB_ISS(%esp), %esp	/* switch back to PCB stack */
907 	xchgl	%ebx, %esp		/* switch to kernel stack */
922 	xchgl	%ebx, %esp		/* switch back to PCB stack */
934 	xchgl	%ebx, %esp		/* switch back to PCB stack */
951 	movl	%esp, %eax		/* saved state addr */
952 	pushl	R32_EIP(%esp)		/* Simulate a CALL from fault point */
954 	movl	%esp, %ebp
957 	addl	$4, %esp
963 	cmpl	$ T_PREEMPT,R32_TRAPNO(%esp)
965 	testl	$ EFL_IF,R32_EFLAGS(%esp)		/* interrupts disabled? */
970 	movl	%esp,%ecx
983  *	esp->	 -> x86_saved_state_t
986  *	esp	 -> low based stack
999 	cmpl	%esp,%ecx
1002 	cmpl	%esp,%edx
1005 	xchgl	%ecx,%esp		/* switch to interrupt stack */
1011 	subl	$8, %esp		/* for 16-byte stack alignment */
1051 	popl	%esp			/* switch back to old stack */
1054 	movl	R32_CS(%esp),%eax	/* assume 32-bit state */
1055 	cmpl	$(SS_64),SS_FLAVOR(%esp)/* 64-bit? */
1057 	movl	R64_CS(%esp),%eax	/* 64-bit user mode */
1074 	movl	%esp,%ecx
1097 	movl	%esp, %edx		/* x86_saved_state */
1123  *	esp	 -> x86_saved_state32_t
1125  *	esp	 -> low based stack
1139 	movl	R32_EAX(%esp),%eax
1148 	xchgl	%edi,%esp			/* switch to kernel stack */
1168 	xchgl	%edi,%esp			/* switch to kernel stack */
1188 	xchgl	%edi,%esp			/* switch to kernel stack */