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132 vana 1
#
2071 jermar 2
# Copyright (c) 2001-2004 Jakub Jermar
132 vana 3
# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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#
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# - Redistributions of source code must retain the above copyright
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#   notice, this list of conditions and the following disclaimer.
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# - Redistributions in binary form must reproduce the above copyright
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#   notice, this list of conditions and the following disclaimer in the
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#   documentation and/or other materials provided with the distribution.
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# - The name of the author may not be used to endorse or promote products
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#   derived from this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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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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# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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## very low and hardware-level functions
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2613 jermar 31
# Mask for interrupts 0 - 31 (bits 0 - 31) where 0 means that int has no error
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# word and 1 means interrupt with error word
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#define ERROR_WORD_INTERRUPT_LIST 0x00027d00
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.text
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.global paging_on
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.global enable_l_apic_in_msr
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.global interrupt_handlers
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.global memsetb
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.global memsetw
1288 jermar 42
.global memcpy
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.global memcpy_from_uspace
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.global memcpy_from_uspace_failover_address
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.global memcpy_to_uspace
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.global memcpy_to_uspace_failover_address
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4055 trochtova 49
# Wrapper for generic memsetb
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memsetb:
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	jmp _memsetb
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# Wrapper for generic memsetw
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memsetw:
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	jmp _memsetw
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1288 jermar 58
#define MEMCPY_DST	4
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#define MEMCPY_SRC	8
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#define MEMCPY_SIZE	12
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/** Copy memory to/from userspace.
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 *
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 * This is almost conventional memcpy().
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 * The difference is that there is a failover part
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 * to where control is returned from a page fault
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 * if the page fault occurs during copy_from_uspace()
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 * or copy_to_uspace().
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 *
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 * @param MEMCPY_DST(%esp)	Destination address.
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 * @param MEMCPY_SRC(%esp)	Source address.
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 * @param MEMCPY_SIZE(%esp)	Size.
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 *
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 * @return MEMCPY_DST(%esp) on success and 0 on failure.
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 */
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memcpy:
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memcpy_from_uspace:
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memcpy_to_uspace:
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	movl %edi, %edx			/* save %edi */
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	movl %esi, %eax			/* save %esi */
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	movl MEMCPY_SIZE(%esp), %ecx
2613 jermar 83
	shrl $2, %ecx			/* size / 4 */
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85
	movl MEMCPY_DST(%esp), %edi
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	movl MEMCPY_SRC(%esp), %esi
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2613 jermar 88
	rep movsl			/* copy whole words */
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	movl MEMCPY_SIZE(%esp), %ecx
2613 jermar 91
	andl $3, %ecx			/* size % 4 */
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	jz 0f
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	rep movsb			/* copy the rest byte by byte */
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0:
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	movl %edx, %edi
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	movl %eax, %esi
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	movl MEMCPY_DST(%esp), %eax	/* MEMCPY_DST(%esp), success */
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	ret
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/*
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 * We got here from as_page_fault() after the memory operations
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 * above had caused a page fault.
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 */
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memcpy_from_uspace_failover_address:
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memcpy_to_uspace_failover_address:
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	movl %edx, %edi
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	movl %eax, %esi
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	xorl %eax, %eax			/* return 0, failure */
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	ret
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## Turn paging on
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#
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# Enable paging and write-back caching in CR0.
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#
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paging_on:
2613 jermar 118
	movl %cr0, %edx
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	orl $(1 << 31), %edx		# paging on
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	# clear Cache Disable and not Write Though
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	andl $~((1 << 30) | (1 << 29)), %edx
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	movl %edx,%cr0
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	jmp 0f
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0:
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	ret
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## Enable local APIC
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#
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# Enable local APIC in MSR.
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#
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enable_l_apic_in_msr:
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	movl $0x1b, %ecx
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	rdmsr
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	orl $(1 << 11), %eax
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	orl $(0xfee00000), %eax
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	wrmsr
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	ret
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1100 palkovsky 140
# Clear nested flag
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# overwrites %ecx
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.macro CLEAR_NT_FLAG
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	pushfl
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	pop %ecx
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	and $0xffffbfff, %ecx
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	push %ecx
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	popfl
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.endm	
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4055 trochtova 150
/*
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 * The SYSENTER syscall mechanism can be used for syscalls with
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 * four or fewer arguments. To pass these four arguments, we
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 * use four registers: EDX, ECX, EBX, ESI. The syscall number
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 * is passed in EAX. We use EDI to remember the return address
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 * and EBP to remember the stack. The INT-based syscall mechanism
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 * can actually handle six arguments plus the syscall number
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 * entirely in registers.
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 */
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.global sysenter_handler
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sysenter_handler:
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	sti
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	pushl %ebp	# remember user stack
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	pushl %edi	# remember return user address
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	pushl %gs	# remember TLS
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	pushl %eax	# syscall number
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	subl $8, %esp	# unused sixth and fifth argument
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	pushl %esi	# fourth argument
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	pushl %ebx	# third argument
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	pushl %ecx	# second argument
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	pushl %edx	# first argument
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	movw $16, %ax
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	movw %ax, %ds
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	movw %ax, %es
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178
	cld
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	call syscall_handler
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	addl $28, %esp	# remove arguments from stack
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	pop %gs		# restore TLS
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	pop %edx	# prepare return EIP for SYSEXIT
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	pop %ecx	# prepare userspace ESP for SYSEXIT
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	sysexit		# return to userspace
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## Declare interrupt handlers
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#
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# Declare interrupt handlers for n interrupt
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# vectors starting at vector i.
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#
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# The handlers setup data segment registers
576 palkovsky 196
# and call exc_dispatch().
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#
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#define INTERRUPT_ALIGN 64
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.macro handler i n
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2613 jermar 201
.ifeq \i - 0x30     # Syscall handler
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	pushl %ds
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	pushl %es
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	pushl %fs
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	pushl %gs
1100 palkovsky 206
 
2613 jermar 207
	#
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	# Push syscall arguments onto the stack
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	#
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	# NOTE: The idea behind the order of arguments passed in registers is to
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	#	use all scratch registers first and preserved registers next.
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	#	An optimized libc syscall wrapper can make use of this setup.
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	#
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	pushl %eax
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	pushl %ebp
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	pushl %edi
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	pushl %esi
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	pushl %ebx
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	pushl %ecx
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	pushl %edx
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	# we must fill the data segment registers
2613 jermar 223
	movw $16, %ax
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	movw %ax, %ds
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	movw %ax, %es
1100 palkovsky 226
 
2784 jermar 227
	cld
1100 palkovsky 228
	sti
2613 jermar 229
	# syscall_handler(edx, ecx, ebx, esi, edi, ebp, eax)
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	call syscall_handler   
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	cli
2613 jermar 232
	addl $28, %esp         # clean-up of parameters
1100 palkovsky 233
 
2613 jermar 234
	popl %gs
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	popl %fs
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	popl %es
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	popl %ds
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	CLEAR_NT_FLAG
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	iret
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.else	
1008 jermar 242
	/*
1021 jermar 243
	 * This macro distinguishes between two versions of ia32 exceptions.
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	 * One version has error word and the other does not have it.
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	 * The latter version fakes the error word on the stack so that the
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	 * handlers and istate_t can be the same for both types.
1008 jermar 247
	 */
2613 jermar 248
	.iflt \i - 32
1021 jermar 249
		.if (1 << \i) & ERROR_WORD_INTERRUPT_LIST
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			/* 
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			 * With error word, do nothing
1021 jermar 252
			 */
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                .else
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                        /*
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                         * Version without error word,
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                         */
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			subl $4, %esp
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                .endif
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        .else
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                /*
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                 * Version without error word,
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                 */
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		subl $4, %esp
1100 palkovsky 264
	.endif
265
 
2613 jermar 266
	pushl %ds
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	pushl %es
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	pushl %fs
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	pushl %gs
132 vana 270
 
2613 jermar 271
	pushl %edx
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	pushl %ecx
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	pushl %eax
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132 vana 275
	# we must fill the data segment registers
2613 jermar 276
	movw $16, %ax
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	movw %ax, %ds
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	movw %ax, %es
132 vana 279
 
2784 jermar 280
	cld
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1100 palkovsky 282
	pushl %esp          # *istate
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	pushl $(\i)         # intnum
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	call exc_dispatch   # excdispatch(intnum, *istate)
2613 jermar 285
	addl $8, %esp       # Clear arguments from stack
132 vana 286
 
1100 palkovsky 287
	CLEAR_NT_FLAG # Modifies %ecx
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2613 jermar 289
	popl %eax
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	popl %ecx
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	popl %edx
1100 palkovsky 292
 
2613 jermar 293
	popl %gs
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	popl %fs
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	popl %es
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	popl %ds
132 vana 297
 
2613 jermar 298
	addl $4, %esp	# Skip error word, no matter whether real or fake.
316 jermar 299
	iret
1100 palkovsky 300
.endif
132 vana 301
 
1100 palkovsky 302
	.align INTERRUPT_ALIGN
2613 jermar 303
	.if (\n- \i) - 1
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	handler "(\i + 1)", \n
132 vana 305
	.endif
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.endm
307
 
308
# keep in sync with pm.h !!!
2613 jermar 309
IDT_ITEMS = 64
1100 palkovsky 310
.align INTERRUPT_ALIGN
132 vana 311
interrupt_handlers:
312
h_start:
1100 palkovsky 313
	handler 0 IDT_ITEMS
132 vana 314
h_end:
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316
.data
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.global interrupt_handler_size
318
 
2613 jermar 319
interrupt_handler_size: .long (h_end - h_start) / IDT_ITEMS