WebSVN – HelenOS – Diff – /trunk/kernel/arch/amd64/src/asm_utils.S


#
# Copyright (c) 2005 Ondrej Palkovsky
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# - Redistributions of source code must retain the above copyright
#   notice, this list of conditions and the following disclaimer.
# - Redistributions in binary form must reproduce the above copyright
#   notice, this list of conditions and the following disclaimer in the
#   documentation and/or other materials provided with the distribution.
# - The name of the author may not be used to endorse or promote products
#   derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
 
#define IREGISTER_SPACE	72 
 
#define IOFFSET_RAX	0x0
#define IOFFSET_RCX	0x8
#define IOFFSET_RDX	0x10
#define IOFFSET_RSI	0x18
#define IOFFSET_RDI	0x20
#define IOFFSET_R8	0x28
 
#define IOFFSET_R9	0x30
#define IOFFSET_R10	0x38
#define IOFFSET_R11	0x40
 
 
 
 
 
 
#  Mask for interrupts 0 - 31 (bits 0 - 31) where 0 means that int has no error word
# and 1 means interrupt with error word
#define ERROR_WORD_INTERRUPT_LIST 0x00027D00
 
#include <arch/pm.h>
#include <arch/mm/page.h>
	
.text
.global interrupt_handlers
.global syscall_entry
.global panic_printf
 
panic_printf:
	movq $halt, (%rsp)
	jmp printf
 
.global cpuid
.global has_cpuid
.global get_cycle
.global read_efer_flag
.global set_efer_flag
.global memsetb
.global memsetw
.global memcpy
.global memcpy_from_uspace
.global memcpy_to_uspace
.global memcpy_from_uspace_failover_address
.global memcpy_to_uspace_failover_address
 
# Wrapper for generic memsetb
memsetb:
	jmp _memsetb
 
# Wrapper for generic memsetw
memsetw:
	jmp _memsetw
 
#define MEMCPY_DST	%rdi
#define MEMCPY_SRC	%rsi
#define MEMCPY_SIZE	%rdx
 
/**
 * Copy memory from/to userspace.
 *
 * This is almost conventional memcpy().
 * The difference is that there is a failover part
 * to where control is returned from a page fault if
 * the page fault occurs during copy_from_uspace()
 * or copy_to_uspace().
 *
 * @param MEMCPY_DST	Destination address.
 * @param MEMCPY_SRC	Source address.
 * @param MEMCPY_SIZE	Number of bytes to copy.
 *
 * @retrun MEMCPY_DST on success, 0 on failure.
 */
memcpy:
memcpy_from_uspace:
memcpy_to_uspace:
	movq MEMCPY_DST, %rax
 
	movq MEMCPY_SIZE, %rcx
	shrq $3, %rcx			/* size / 8 */
	
	rep movsq			/* copy as much as possible word by word */
 
	movq MEMCPY_SIZE, %rcx
	andq $7, %rcx			/* size % 8 */
	jz 0f
	
	rep movsb			/* copy the rest byte by byte */
	
0:
	ret				/* return MEMCPY_SRC, success */
 
memcpy_from_uspace_failover_address:
memcpy_to_uspace_failover_address:
	xorq %rax, %rax			/* return 0, failure */
	ret
 
## Determine CPUID support
#
# Return 0 in EAX if CPUID is not support, 1 if supported.
#
has_cpuid:
	pushfq			# store flags
	popq %rax		# read flags
	movq %rax,%rdx		# copy flags
	btcl $21,%edx		# swap the ID bit
	pushq %rdx
	popfq			# propagate the change into flags
	pushfq
	popq %rdx		# read flags	
	andl $(1<<21),%eax	# interested only in ID bit
	andl $(1<<21),%edx
	xorl %edx,%eax		# 0 if not supported, 1 if supported
	ret
 
cpuid:
	movq %rbx, %r10  # we have to preserve rbx across function calls
 
	movl %edi,%eax	# load the command into %eax
 
	cpuid	
	movl %eax,0(%rsi)
	movl %ebx,4(%rsi)
	movl %ecx,8(%rsi)
	movl %edx,12(%rsi)
 
	movq %r10, %rbx
	ret
 
get_cycle:
	xorq %rax,%rax
	rdtsc
	ret
 
set_efer_flag:
	movq $0xc0000080, %rcx
	rdmsr
	btsl %edi, %eax
	wrmsr
	ret
	
read_efer_flag:	
	movq $0xc0000080, %rcx
	rdmsr
	ret 		
 
# Push all volatile general purpose registers on stack
.macro save_all_gpr
	movq %rax, IOFFSET_RAX(%rsp)
	movq %rcx, IOFFSET_RCX(%rsp)
	movq %rdx, IOFFSET_RDX(%rsp)
	movq %rsi, IOFFSET_RSI(%rsp)
	movq %rdi, IOFFSET_RDI(%rsp)
	movq %r8, IOFFSET_R8(%rsp)
	movq %r9, IOFFSET_R9(%rsp)
	movq %r10, IOFFSET_R10(%rsp)
	movq %r11, IOFFSET_R11(%rsp)
 
 
 
 
 
 
 
 
.endm
 
.macro restore_all_gpr
	movq IOFFSET_RAX(%rsp), %rax
	movq IOFFSET_RCX(%rsp), %rcx
	movq IOFFSET_RDX(%rsp), %rdx
	movq IOFFSET_RSI(%rsp), %rsi
	movq IOFFSET_RDI(%rsp), %rdi
	movq IOFFSET_R8(%rsp), %r8
	movq IOFFSET_R9(%rsp), %r9
	movq IOFFSET_R10(%rsp), %r10
	movq IOFFSET_R11(%rsp), %r11
 
 
 
 
 
 
 
 
.endm
 
 
 
 
#define INTERRUPT_ALIGN 128
 
	
## Declare interrupt handlers
#
# Declare interrupt handlers for n interrupt
# vectors starting at vector i.
#
# The handlers call exc_dispatch().
#
.macro handler i n
 
	/*
	 * Choose between version with error code and version without error
	 * code. Both versions have to be of the same size. amd64 assembly is,
	 * however, a little bit tricky. For instance, subq $0x80, %rsp and
	 * subq $0x78, %rsp can result in two instructions with different
	 * op-code lengths.
	 * Therefore we align the interrupt handlers.
	 */
 
	.iflt \i-32
		.if (1 << \i) & ERROR_WORD_INTERRUPT_LIST
			/*
			 * Version with error word.
			 */
			subq $IREGISTER_SPACE, %rsp
		.else
			/*
			 * Version without error word,
			 */
			subq $(IREGISTER_SPACE+8), %rsp
		.endif
	.else
		/*
		 * Version without error word,
		 */
		subq $(IREGISTER_SPACE+8), %rsp
	.endif	
 
	save_all_gpr
	cld
 
	movq $(\i), %rdi   	# %rdi - first parameter
	movq %rsp, %rsi   	# %rsi - pointer to istate
	call exc_dispatch 	# exc_dispatch(i, istate)
	
	restore_all_gpr
	# $8 = Skip error word
	addq $(IREGISTER_SPACE+8), %rsp
	iretq
 
	.align INTERRUPT_ALIGN
	.if (\n-\i)-1
	handler "(\i+1)",\n
	.endif
.endm
 
.align INTERRUPT_ALIGN
interrupt_handlers:
h_start:
	handler 0 IDT_ITEMS
h_end:
 
## Low-level syscall handler
# 
# Registers on entry:
#
# @param rcx		Userspace return address.
# @param r11		Userspace RLFAGS.
#
# @param rax		Syscall number.
# @param rdi		1st syscall argument.
# @param rsi		2nd syscall argument.
# @param rdx		3rd syscall argument.
# @param r10		4th syscall argument. Used instead of RCX because the
#			SYSCALL instruction clobbers it.
# @param r8		5th syscall argument.
# @param r9		6th syscall argument.
#
# @return		Return value is in rax.
#
syscall_entry:
	swapgs			# Switch to hidden gs	
	# 
	# %gs:0			Scratch space for this thread's user RSP
	# %gs:8			Address to be used as this thread's kernel RSP
	#
	movq %rsp, %gs:0	# Save this thread's user RSP
	movq %gs:8, %rsp	# Set this thread's kernel RSP
	swapgs			# Switch back to remain consistent
	sti
	
	pushq %rcx
	pushq %r11
 
	movq %r10, %rcx		# Copy the 4th argument where it is expected 
	pushq %rax
	call syscall_handler
	addq $8, %rsp
		
	popq %r11
	popq %rcx
 
	cli
	swapgs
	movq %gs:0, %rsp	# Restore the user RSP
	swapgs
 
	sysretq
 
.data
.global interrupt_handler_size
 
interrupt_handler_size: .quad (h_end-h_start)/IDT_ITEMS
 

Rev 3274	Rev 3890
1	#	1	#
2	# Copyright (c) 2005 Ondrej Palkovsky	2	# Copyright (c) 2005 Ondrej Palkovsky
3	# All rights reserved.	3	# All rights reserved.
4	#	4	#
5	# Redistribution and use in source and binary forms, with or without	5	# Redistribution and use in source and binary forms, with or without
6	# modification, are permitted provided that the following conditions	6	# modification, are permitted provided that the following conditions
7	# are met:	7	# are met:
8	#	8	#
9	# - Redistributions of source code must retain the above copyright	9	# - Redistributions of source code must retain the above copyright
10	# notice, this list of conditions and the following disclaimer.	10	# notice, this list of conditions and the following disclaimer.
11	# - Redistributions in binary form must reproduce the above copyright	11	# - Redistributions in binary form must reproduce the above copyright
12	# notice, this list of conditions and the following disclaimer in the	12	# notice, this list of conditions and the following disclaimer in the
13	# documentation and/or other materials provided with the distribution.	13	# documentation and/or other materials provided with the distribution.
14	# - The name of the author may not be used to endorse or promote products	14	# - The name of the author may not be used to endorse or promote products
15	# derived from this software without specific prior written permission.	15	# derived from this software without specific prior written permission.
16	#	16	#
17	# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR	17	# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18	# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES	18	# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19	# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.	19	# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20	# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,	20	# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21	# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT	21	# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22	# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,	22	# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23	# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY	23	# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24	# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT	24	# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25	# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF	25	# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26	# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.	26	# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27	#	27	#
28		28
29	#define IREGISTER_SPACE 120	29	#define IREGISTER_SPACE 72
30		30
31	#define IOFFSET_RAX 0x0	31	#define IOFFSET_RAX 0x0
32	#define IOFFSET_RBX 0x8	32	#define IOFFSET_RCX 0x8
33	#define IOFFSET_RCX 0x10	33	#define IOFFSET_RDX 0x10
34	#define IOFFSET_RDX 0x18	34	#define IOFFSET_RSI 0x18
35	#define IOFFSET_RSI 0x20	35	#define IOFFSET_RDI 0x20
36	#define IOFFSET_RDI 0x28	36	#define IOFFSET_R8 0x28
37	#define IOFFSET_R8 0x30	-
38	#define IOFFSET_R9 0x38	37	#define IOFFSET_R9 0x30
39	#define IOFFSET_R10 0x40	38	#define IOFFSET_R10 0x38
40	#define IOFFSET_R11 0x48	39	#define IOFFSET_R11 0x40
41	#define IOFFSET_R12 0x50	-
42	#define IOFFSET_R13 0x58	-
43	#define IOFFSET_R14 0x60	-
44	#define IOFFSET_R15 0x68	-
45	#define IOFFSET_RBP 0x70	-
46		40
47	# Mask for interrupts 0 - 31 (bits 0 - 31) where 0 means that int has no error word	41	# Mask for interrupts 0 - 31 (bits 0 - 31) where 0 means that int has no error word
48	# and 1 means interrupt with error word	42	# and 1 means interrupt with error word
49	#define ERROR_WORD_INTERRUPT_LIST 0x00027D00	43	#define ERROR_WORD_INTERRUPT_LIST 0x00027D00
50		44
51	#include <arch/pm.h>	45	#include <arch/pm.h>
52	#include <arch/mm/page.h>	46	#include <arch/mm/page.h>
53		47
54	.text	48	.text
55	.global interrupt_handlers	49	.global interrupt_handlers
56	.global syscall_entry	50	.global syscall_entry
57	.global panic_printf	51	.global panic_printf
58		52
59	panic_printf:	53	panic_printf:
60	movq $halt, (%rsp)	54	movq $halt, (%rsp)
61	jmp printf	55	jmp printf
62		56
63	.global cpuid	57	.global cpuid
64	.global has_cpuid	58	.global has_cpuid
65	.global get_cycle	59	.global get_cycle
66	.global read_efer_flag	60	.global read_efer_flag
67	.global set_efer_flag	61	.global set_efer_flag
68	.global memsetb	62	.global memsetb
69	.global memsetw	63	.global memsetw
70	.global memcpy	64	.global memcpy
71	.global memcpy_from_uspace	65	.global memcpy_from_uspace
72	.global memcpy_to_uspace	66	.global memcpy_to_uspace
73	.global memcpy_from_uspace_failover_address	67	.global memcpy_from_uspace_failover_address
74	.global memcpy_to_uspace_failover_address	68	.global memcpy_to_uspace_failover_address
75		69
76	# Wrapper for generic memsetb	70	# Wrapper for generic memsetb
77	memsetb:	71	memsetb:
78	jmp _memsetb	72	jmp _memsetb
79		73
80	# Wrapper for generic memsetw	74	# Wrapper for generic memsetw
81	memsetw:	75	memsetw:
82	jmp _memsetw	76	jmp _memsetw
83		77
84	#define MEMCPY_DST %rdi	78	#define MEMCPY_DST %rdi
85	#define MEMCPY_SRC %rsi	79	#define MEMCPY_SRC %rsi
86	#define MEMCPY_SIZE %rdx	80	#define MEMCPY_SIZE %rdx
87		81
88	/**	82	/**
89	* Copy memory from/to userspace.	83	* Copy memory from/to userspace.
90	*	84	*
91	* This is almost conventional memcpy().	85	* This is almost conventional memcpy().
92	* The difference is that there is a failover part	86	* The difference is that there is a failover part
93	* to where control is returned from a page fault if	87	* to where control is returned from a page fault if
94	* the page fault occurs during copy_from_uspace()	88	* the page fault occurs during copy_from_uspace()
95	* or copy_to_uspace().	89	* or copy_to_uspace().
96	*	90	*
97	* @param MEMCPY_DST Destination address.	91	* @param MEMCPY_DST Destination address.
98	* @param MEMCPY_SRC Source address.	92	* @param MEMCPY_SRC Source address.
99	* @param MEMCPY_SIZE Number of bytes to copy.	93	* @param MEMCPY_SIZE Number of bytes to copy.
100	*	94	*
101	* @retrun MEMCPY_DST on success, 0 on failure.	95	* @retrun MEMCPY_DST on success, 0 on failure.
102	*/	96	*/
103	memcpy:	97	memcpy:
104	memcpy_from_uspace:	98	memcpy_from_uspace:
105	memcpy_to_uspace:	99	memcpy_to_uspace:
106	movq MEMCPY_DST, %rax	100	movq MEMCPY_DST, %rax
107		101
108	movq MEMCPY_SIZE, %rcx	102	movq MEMCPY_SIZE, %rcx
109	shrq $3, %rcx /* size / 8 */	103	shrq $3, %rcx /* size / 8 */
110		104
111	rep movsq /* copy as much as possible word by word */	105	rep movsq /* copy as much as possible word by word */
112		106
113	movq MEMCPY_SIZE, %rcx	107	movq MEMCPY_SIZE, %rcx
114	andq $7, %rcx /* size % 8 */	108	andq $7, %rcx /* size % 8 */
115	jz 0f	109	jz 0f
116		110
117	rep movsb /* copy the rest byte by byte */	111	rep movsb /* copy the rest byte by byte */
118		112
119	0:	113	0:
120	ret /* return MEMCPY_SRC, success */	114	ret /* return MEMCPY_SRC, success */
121		115
122	memcpy_from_uspace_failover_address:	116	memcpy_from_uspace_failover_address:
123	memcpy_to_uspace_failover_address:	117	memcpy_to_uspace_failover_address:
124	xorq %rax, %rax /* return 0, failure */	118	xorq %rax, %rax /* return 0, failure */
125	ret	119	ret
126		120
127	## Determine CPUID support	121	## Determine CPUID support
128	#	122	#
129	# Return 0 in EAX if CPUID is not support, 1 if supported.	123	# Return 0 in EAX if CPUID is not support, 1 if supported.
130	#	124	#
131	has_cpuid:	125	has_cpuid:
132	pushfq # store flags	126	pushfq # store flags
133	popq %rax # read flags	127	popq %rax # read flags
134	movq %rax,%rdx # copy flags	128	movq %rax,%rdx # copy flags
135	btcl $21,%edx # swap the ID bit	129	btcl $21,%edx # swap the ID bit
136	pushq %rdx	130	pushq %rdx
137	popfq # propagate the change into flags	131	popfq # propagate the change into flags
138	pushfq	132	pushfq
139	popq %rdx # read flags	133	popq %rdx # read flags
140	andl $(1<<21),%eax # interested only in ID bit	134	andl $(1<<21),%eax # interested only in ID bit
141	andl $(1<<21),%edx	135	andl $(1<<21),%edx
142	xorl %edx,%eax # 0 if not supported, 1 if supported	136	xorl %edx,%eax # 0 if not supported, 1 if supported
143	ret	137	ret
144		138
145	cpuid:	139	cpuid:
146	movq %rbx, %r10 # we have to preserve rbx across function calls	140	movq %rbx, %r10 # we have to preserve rbx across function calls
147		141
148	movl %edi,%eax # load the command into %eax	142	movl %edi,%eax # load the command into %eax
149		143
150	cpuid	144	cpuid
151	movl %eax,0(%rsi)	145	movl %eax,0(%rsi)
152	movl %ebx,4(%rsi)	146	movl %ebx,4(%rsi)
153	movl %ecx,8(%rsi)	147	movl %ecx,8(%rsi)
154	movl %edx,12(%rsi)	148	movl %edx,12(%rsi)
155		149
156	movq %r10, %rbx	150	movq %r10, %rbx
157	ret	151	ret
158		152
159	get_cycle:	153	get_cycle:
160	xorq %rax,%rax	154	xorq %rax,%rax
161	rdtsc	155	rdtsc
162	ret	156	ret
163		157
164	set_efer_flag:	158	set_efer_flag:
165	movq $0xc0000080, %rcx	159	movq $0xc0000080, %rcx
166	rdmsr	160	rdmsr
167	btsl %edi, %eax	161	btsl %edi, %eax
168	wrmsr	162	wrmsr
169	ret	163	ret
170		164
171	read_efer_flag:	165	read_efer_flag:
172	movq $0xc0000080, %rcx	166	movq $0xc0000080, %rcx
173	rdmsr	167	rdmsr
174	ret	168	ret
175		169
176	# Push all general purpose registers on stack except %rbp, %rsp	170	# Push all volatile general purpose registers on stack
177	.macro save_all_gpr	171	.macro save_all_gpr
178	movq %rax, IOFFSET_RAX(%rsp)	172	movq %rax, IOFFSET_RAX(%rsp)
179	movq %rcx, IOFFSET_RCX(%rsp)	173	movq %rcx, IOFFSET_RCX(%rsp)
180	movq %rdx, IOFFSET_RDX(%rsp)	174	movq %rdx, IOFFSET_RDX(%rsp)
181	movq %rsi, IOFFSET_RSI(%rsp)	175	movq %rsi, IOFFSET_RSI(%rsp)
182	movq %rdi, IOFFSET_RDI(%rsp)	176	movq %rdi, IOFFSET_RDI(%rsp)
183	movq %r8, IOFFSET_R8(%rsp)	177	movq %r8, IOFFSET_R8(%rsp)
184	movq %r9, IOFFSET_R9(%rsp)	178	movq %r9, IOFFSET_R9(%rsp)
185	movq %r10, IOFFSET_R10(%rsp)	179	movq %r10, IOFFSET_R10(%rsp)
186	movq %r11, IOFFSET_R11(%rsp)	180	movq %r11, IOFFSET_R11(%rsp)
187	#ifdef CONFIG_DEBUG_ALLREGS	-
188	movq %rbx, IOFFSET_RBX(%rsp)	-
189	movq %rbp, IOFFSET_RBP(%rsp)	-
190	movq %r12, IOFFSET_R12(%rsp)	-
191	movq %r13, IOFFSET_R13(%rsp)	-
192	movq %r14, IOFFSET_R14(%rsp)	-
193	movq %r15, IOFFSET_R15(%rsp)	-
194	#endif	-
195	.endm	181	.endm
196		182
197	.macro restore_all_gpr	183	.macro restore_all_gpr
198	movq IOFFSET_RAX(%rsp), %rax	184	movq IOFFSET_RAX(%rsp), %rax
199	movq IOFFSET_RCX(%rsp), %rcx	185	movq IOFFSET_RCX(%rsp), %rcx
200	movq IOFFSET_RDX(%rsp), %rdx	186	movq IOFFSET_RDX(%rsp), %rdx
201	movq IOFFSET_RSI(%rsp), %rsi	187	movq IOFFSET_RSI(%rsp), %rsi
202	movq IOFFSET_RDI(%rsp), %rdi	188	movq IOFFSET_RDI(%rsp), %rdi
203	movq IOFFSET_R8(%rsp), %r8	189	movq IOFFSET_R8(%rsp), %r8
204	movq IOFFSET_R9(%rsp), %r9	190	movq IOFFSET_R9(%rsp), %r9
205	movq IOFFSET_R10(%rsp), %r10	191	movq IOFFSET_R10(%rsp), %r10
206	movq IOFFSET_R11(%rsp), %r11	192	movq IOFFSET_R11(%rsp), %r11
207	#ifdef CONFIG_DEBUG_ALLREGS	-
208	movq IOFFSET_RBX(%rsp), %rbx	-
209	movq IOFFSET_RBP(%rsp), %rbp	-
210	movq IOFFSET_R12(%rsp), %r12	-
211	movq IOFFSET_R13(%rsp), %r13	-
212	movq IOFFSET_R14(%rsp), %r14	-
213	movq IOFFSET_R15(%rsp), %r15	-
214	#endif	-
215	.endm	193	.endm
216		194
217	#ifdef CONFIG_DEBUG_ALLREGS	-
218	# define INTERRUPT_ALIGN 256	-
219	#else	-
220	# define INTERRUPT_ALIGN 128	195	#define INTERRUPT_ALIGN 128
221	#endif	-
222		196
223	## Declare interrupt handlers	197	## Declare interrupt handlers
224	#	198	#
225	# Declare interrupt handlers for n interrupt	199	# Declare interrupt handlers for n interrupt
226	# vectors starting at vector i.	200	# vectors starting at vector i.
227	#	201	#
228	# The handlers call exc_dispatch().	202	# The handlers call exc_dispatch().
229	#	203	#
230	.macro handler i n	204	.macro handler i n
231		205
232	/*	206	/*
233	* Choose between version with error code and version without error	207	* Choose between version with error code and version without error
234	* code. Both versions have to be of the same size. amd64 assembly is,	208	* code. Both versions have to be of the same size. amd64 assembly is,
235	* however, a little bit tricky. For instance, subq $0x80, %rsp and	209	* however, a little bit tricky. For instance, subq $0x80, %rsp and
236	* subq $0x78, %rsp can result in two instructions with different	210	* subq $0x78, %rsp can result in two instructions with different
237	* op-code lengths.	211	* op-code lengths.
238	* Therefore we align the interrupt handlers.	212	* Therefore we align the interrupt handlers.
239	*/	213	*/
240		214
241	.iflt \i-32	215	.iflt \i-32
242	.if (1 << \i) & ERROR_WORD_INTERRUPT_LIST	216	.if (1 << \i) & ERROR_WORD_INTERRUPT_LIST
243	/*	217	/*
244	* Version with error word.	218	* Version with error word.
245	*/	219	*/
246	subq $IREGISTER_SPACE, %rsp	220	subq $IREGISTER_SPACE, %rsp
247	.else	221	.else
248	/*	222	/*
249	* Version without error word,	223	* Version without error word,
250	*/	224	*/
251	subq $(IREGISTER_SPACE+8), %rsp	225	subq $(IREGISTER_SPACE+8), %rsp
252	.endif	226	.endif
253	.else	227	.else
254	/*	228	/*
255	* Version without error word,	229	* Version without error word,
256	*/	230	*/
257	subq $(IREGISTER_SPACE+8), %rsp	231	subq $(IREGISTER_SPACE+8), %rsp
258	.endif	232	.endif
259		233
260	save_all_gpr	234	save_all_gpr
261	cld	235	cld
262		236
263	movq $(\i), %rdi # %rdi - first parameter	237	movq $(\i), %rdi # %rdi - first parameter
264	movq %rsp, %rsi # %rsi - pointer to istate	238	movq %rsp, %rsi # %rsi - pointer to istate
265	call exc_dispatch # exc_dispatch(i, istate)	239	call exc_dispatch # exc_dispatch(i, istate)
266		240
267	restore_all_gpr	241	restore_all_gpr
268	# $8 = Skip error word	242	# $8 = Skip error word
269	addq $(IREGISTER_SPACE+8), %rsp	243	addq $(IREGISTER_SPACE+8), %rsp
270	iretq	244	iretq
271		245
272	.align INTERRUPT_ALIGN	246	.align INTERRUPT_ALIGN
273	.if (\n-\i)-1	247	.if (\n-\i)-1
274	handler "(\i+1)",\n	248	handler "(\i+1)",\n
275	.endif	249	.endif
276	.endm	250	.endm
277		251
278	.align INTERRUPT_ALIGN	252	.align INTERRUPT_ALIGN
279	interrupt_handlers:	253	interrupt_handlers:
280	h_start:	254	h_start:
281	handler 0 IDT_ITEMS	255	handler 0 IDT_ITEMS
282	h_end:	256	h_end:
283		257
284	## Low-level syscall handler	258	## Low-level syscall handler
285	#	259	#
286	# Registers on entry:	260	# Registers on entry:
287	#	261	#
288	# @param rcx Userspace return address.	262	# @param rcx Userspace return address.
289	# @param r11 Userspace RLFAGS.	263	# @param r11 Userspace RLFAGS.
290	#	264	#
291	# @param rax Syscall number.	265	# @param rax Syscall number.
292	# @param rdi 1st syscall argument.	266	# @param rdi 1st syscall argument.
293	# @param rsi 2nd syscall argument.	267	# @param rsi 2nd syscall argument.
294	# @param rdx 3rd syscall argument.	268	# @param rdx 3rd syscall argument.
295	# @param r10 4th syscall argument. Used instead of RCX because the	269	# @param r10 4th syscall argument. Used instead of RCX because the
296	# SYSCALL instruction clobbers it.	270	# SYSCALL instruction clobbers it.
297	# @param r8 5th syscall argument.	271	# @param r8 5th syscall argument.
298	# @param r9 6th syscall argument.	272	# @param r9 6th syscall argument.
299	#	273	#
300	# @return Return value is in rax.	274	# @return Return value is in rax.
301	#	275	#
302	syscall_entry:	276	syscall_entry:
303	swapgs # Switch to hidden gs	277	swapgs # Switch to hidden gs
304	#	278	#
305	# %gs:0 Scratch space for this thread's user RSP	279	# %gs:0 Scratch space for this thread's user RSP
306	# %gs:8 Address to be used as this thread's kernel RSP	280	# %gs:8 Address to be used as this thread's kernel RSP
307	#	281	#
308	movq %rsp, %gs:0 # Save this thread's user RSP	282	movq %rsp, %gs:0 # Save this thread's user RSP
309	movq %gs:8, %rsp # Set this thread's kernel RSP	283	movq %gs:8, %rsp # Set this thread's kernel RSP
310	swapgs # Switch back to remain consistent	284	swapgs # Switch back to remain consistent
311	sti	285	sti
312		286
313	pushq %rcx	287	pushq %rcx
314	pushq %r11	288	pushq %r11
315		289
316	movq %r10, %rcx # Copy the 4th argument where it is expected	290	movq %r10, %rcx # Copy the 4th argument where it is expected
317	pushq %rax	291	pushq %rax
318	call syscall_handler	292	call syscall_handler
319	addq $8, %rsp	293	addq $8, %rsp
320		294
321	popq %r11	295	popq %r11
322	popq %rcx	296	popq %rcx
323		297
324	cli	298	cli
325	swapgs	299	swapgs
326	movq %gs:0, %rsp # Restore the user RSP	300	movq %gs:0, %rsp # Restore the user RSP
327	swapgs	301	swapgs
328		302
329	sysretq	303	sysretq
330		304
331	.data	305	.data
332	.global interrupt_handler_size	306	.global interrupt_handler_size
333		307
334	interrupt_handler_size: .quad (h_end-h_start)/IDT_ITEMS	308	interrupt_handler_size: .quad (h_end-h_start)/IDT_ITEMS
335		309

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(root)/trunk/kernel/arch/amd64/src/asm_utils.S – Rev 3274 → 3890