Subversion Repositories HelenOS

.global interrupt_handlers

# Clear nested flag

# overwrites %ecx

.macro CLEAR_NT_FLAG

	pushfl

	pop %ecx

	and $0xffffbfff,%ecx

	push %ecx

	popfl

.endm	

## Declare interrupt handlers

#

# Declare interrupt handlers for n interrupt

# vectors starting at vector i.

#

# The handlers setup data segment registers

# and call exc_dispatch().

#

#define INTERRUPT_ALIGN 64

.macro handler i n

.ifeq \i-0x30     # Syscall handler

	push %ds

	push %es

	push %fs

	push %gs

	# Push arguments on stack

	push %edi

	push %esi

	push %edx

	push %ecx

	push %eax

	# we must fill the data segment registers

	movw $16,%ax

	movw %ax,%ds

	movw %ax,%es

	sti

	call syscall_handler   # syscall_handler(ax,cx,dx,si,di)

	cli

	addl $20, %esp         # clean-up of parameters

	pop %gs

	pop %fs

	pop %es

	pop %ds

	CLEAR_NT_FLAG

	iret

.else	

	/*

	 * This macro distinguishes between two versions of ia32 exceptions.

	 * One version has error word and the other does not have it.

	 * The latter version fakes the error word on the stack so that the

	 * handlers and istate_t can be the same for both types.

	 */

	.iflt \i-32

		.if (1 << \i) & ERROR_WORD_INTERRUPT_LIST

			/* 

			 * With error word, do nothing

			 */

                .else

                        /*

                         * Version without error word,

                         */

			subl $4, %esp

                .endif

        .else

                /*

                 * Version without error word,

                 */

		subl $4, %esp

	.endif

	push %ds

	push %es

	push %fs

	push %gs

#ifdef CONFIG_DEBUG_ALLREGS

	push %ebx

	push %ebp

	push %edi

	push %esi

#else

	sub $16, %esp

#endif

	push %edx

	push %ecx

	push %eax

	# we must fill the data segment registers

	movw $16,%ax

	movw %ax,%ds

	movw %ax,%es

	pushl %esp          # *istate

	pushl $(\i)         # intnum

	call exc_dispatch   # excdispatch(intnum, *istate)

	addl $8,%esp        # Clear arguments from stack

	CLEAR_NT_FLAG # Modifies %ecx

	pop %eax

	pop %ecx

	pop %edx

#ifdef CONFIG_DEBUG_ALLREGS

	pop %esi

	pop %edi

	pop %ebp

	pop %ebx

#else

	add $16, %esp

#endif	

	pop %gs

	pop %fs

	pop %es

	pop %ds

	addl $4,%esp	# Skip error word, no matter whether real or fake.

	iret

.endif

	.align INTERRUPT_ALIGN

	.if (\n-\i)-1

	handler "(\i+1)",\n

	.endif

.endm

# keep in sync with pm.h !!!

IDT_ITEMS=64

.align INTERRUPT_ALIGN

interrupt_handlers:

h_start:

	handler 0 IDT_ITEMS

h_end:

.data

.global interrupt_handler_size

interrupt_handler_size: .long (h_end-h_start)/IDT_ITEMS