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1 | # |
1 | # |
2 | # Copyright (c) 2001-2004 Jakub Jermar |
2 | # Copyright (c) 2001-2004 Jakub Jermar |
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 | ## very low and hardware-level functions |
29 | ## very low and hardware-level functions |
30 | 30 | ||
31 | # Mask for interrupts 0 - 31 (bits 0 - 31) where 0 means that int has no error |
31 | # Mask for interrupts 0 - 31 (bits 0 - 31) where 0 means that int has no error |
32 | # word and 1 means interrupt with error word |
32 | # word and 1 means interrupt with error word |
33 | #define ERROR_WORD_INTERRUPT_LIST 0x00027d00 |
33 | #define ERROR_WORD_INTERRUPT_LIST 0x00027d00 |
34 | 34 | ||
35 | .text |
35 | .text |
36 | 36 | ||
37 | .global paging_on |
37 | .global paging_on |
38 | .global enable_l_apic_in_msr |
38 | .global enable_l_apic_in_msr |
39 | .global interrupt_handlers |
39 | .global interrupt_handlers |
40 | .global memsetb |
40 | .global memsetb |
41 | .global memsetw |
41 | .global memsetw |
42 | .global memcpy |
42 | .global memcpy |
43 | .global memcpy_from_uspace |
43 | .global memcpy_from_uspace |
44 | .global memcpy_from_uspace_failover_address |
44 | .global memcpy_from_uspace_failover_address |
45 | .global memcpy_to_uspace |
45 | .global memcpy_to_uspace |
46 | .global memcpy_to_uspace_failover_address |
46 | .global memcpy_to_uspace_failover_address |
47 | 47 | ||
48 | 48 | ||
49 | # Wrapper for generic memsetb |
49 | # Wrapper for generic memsetb |
50 | memsetb: |
50 | memsetb: |
51 | jmp _memsetb |
51 | jmp _memsetb |
52 | 52 | ||
53 | # Wrapper for generic memsetw |
53 | # Wrapper for generic memsetw |
54 | memsetw: |
54 | memsetw: |
55 | jmp _memsetw |
55 | jmp _memsetw |
56 | 56 | ||
57 | 57 | ||
58 | #define MEMCPY_DST 4 |
58 | #define MEMCPY_DST 4 |
59 | #define MEMCPY_SRC 8 |
59 | #define MEMCPY_SRC 8 |
60 | #define MEMCPY_SIZE 12 |
60 | #define MEMCPY_SIZE 12 |
61 | 61 | ||
62 | /** Copy memory to/from userspace. |
62 | /** Copy memory to/from userspace. |
63 | * |
63 | * |
64 | * This is almost conventional memcpy(). |
64 | * This is almost conventional memcpy(). |
65 | * The difference is that there is a failover part |
65 | * The difference is that there is a failover part |
66 | * to where control is returned from a page fault |
66 | * to where control is returned from a page fault |
67 | * if the page fault occurs during copy_from_uspace() |
67 | * if the page fault occurs during copy_from_uspace() |
68 | * or copy_to_uspace(). |
68 | * or copy_to_uspace(). |
69 | * |
69 | * |
70 | * @param MEMCPY_DST(%esp) Destination address. |
70 | * @param MEMCPY_DST(%esp) Destination address. |
71 | * @param MEMCPY_SRC(%esp) Source address. |
71 | * @param MEMCPY_SRC(%esp) Source address. |
72 | * @param MEMCPY_SIZE(%esp) Size. |
72 | * @param MEMCPY_SIZE(%esp) Size. |
73 | * |
73 | * |
74 | * @return MEMCPY_DST(%esp) on success and 0 on failure. |
74 | * @return MEMCPY_DST(%esp) on success and 0 on failure. |
75 | */ |
75 | */ |
76 | memcpy: |
76 | memcpy: |
77 | memcpy_from_uspace: |
77 | memcpy_from_uspace: |
78 | memcpy_to_uspace: |
78 | memcpy_to_uspace: |
79 | movl %edi, %edx /* save %edi */ |
79 | movl %edi, %edx /* save %edi */ |
80 | movl %esi, %eax /* save %esi */ |
80 | movl %esi, %eax /* save %esi */ |
81 | 81 | ||
82 | movl MEMCPY_SIZE(%esp), %ecx |
82 | movl MEMCPY_SIZE(%esp), %ecx |
83 | shrl $2, %ecx /* size / 4 */ |
83 | shrl $2, %ecx /* size / 4 */ |
84 | 84 | ||
85 | movl MEMCPY_DST(%esp), %edi |
85 | movl MEMCPY_DST(%esp), %edi |
86 | movl MEMCPY_SRC(%esp), %esi |
86 | movl MEMCPY_SRC(%esp), %esi |
87 | 87 | ||
88 | rep movsl /* copy whole words */ |
88 | rep movsl /* copy whole words */ |
89 | 89 | ||
90 | movl MEMCPY_SIZE(%esp), %ecx |
90 | movl MEMCPY_SIZE(%esp), %ecx |
91 | andl $3, %ecx /* size % 4 */ |
91 | andl $3, %ecx /* size % 4 */ |
92 | jz 0f |
92 | jz 0f |
93 | 93 | ||
94 | rep movsb /* copy the rest byte by byte */ |
94 | rep movsb /* copy the rest byte by byte */ |
95 | 95 | ||
96 | 0: |
96 | 0: |
97 | movl %edx, %edi |
97 | movl %edx, %edi |
98 | movl %eax, %esi |
98 | movl %eax, %esi |
99 | movl MEMCPY_DST(%esp), %eax /* MEMCPY_DST(%esp), success */ |
99 | movl MEMCPY_DST(%esp), %eax /* MEMCPY_DST(%esp), success */ |
100 | ret |
100 | ret |
101 | 101 | ||
102 | /* |
102 | /* |
103 | * We got here from as_page_fault() after the memory operations |
103 | * We got here from as_page_fault() after the memory operations |
104 | * above had caused a page fault. |
104 | * above had caused a page fault. |
105 | */ |
105 | */ |
106 | memcpy_from_uspace_failover_address: |
106 | memcpy_from_uspace_failover_address: |
107 | memcpy_to_uspace_failover_address: |
107 | memcpy_to_uspace_failover_address: |
108 | movl %edx, %edi |
108 | movl %edx, %edi |
109 | movl %eax, %esi |
109 | movl %eax, %esi |
110 | xorl %eax, %eax /* return 0, failure */ |
110 | xorl %eax, %eax /* return 0, failure */ |
111 | ret |
111 | ret |
112 | 112 | ||
113 | ## Turn paging on |
113 | ## Turn paging on |
114 | # |
114 | # |
115 | # Enable paging and write-back caching in CR0. |
115 | # Enable paging and write-back caching in CR0. |
116 | # |
116 | # |
117 | paging_on: |
117 | paging_on: |
118 | movl %cr0, %edx |
118 | movl %cr0, %edx |
119 | orl $(1 << 31), %edx # paging on |
119 | orl $(1 << 31), %edx # paging on |
120 | # clear Cache Disable and not Write Though |
120 | # clear Cache Disable and not Write Though |
121 | andl $~((1 << 30) | (1 << 29)), %edx |
121 | andl $~((1 << 30) | (1 << 29)), %edx |
122 | movl %edx,%cr0 |
122 | movl %edx,%cr0 |
123 | jmp 0f |
123 | jmp 0f |
124 | 0: |
124 | 0: |
125 | ret |
125 | ret |
126 | 126 | ||
127 | 127 | ||
128 | ## Enable local APIC |
128 | ## Enable local APIC |
129 | # |
129 | # |
130 | # Enable local APIC in MSR. |
130 | # Enable local APIC in MSR. |
131 | # |
131 | # |
132 | enable_l_apic_in_msr: |
132 | enable_l_apic_in_msr: |
133 | movl $0x1b, %ecx |
133 | movl $0x1b, %ecx |
134 | rdmsr |
134 | rdmsr |
135 | orl $(1 << 11), %eax |
135 | orl $(1 << 11), %eax |
136 | orl $(0xfee00000), %eax |
136 | orl $(0xfee00000), %eax |
137 | wrmsr |
137 | wrmsr |
138 | ret |
138 | ret |
139 | 139 | ||
140 | # Clear nested flag |
140 | # Clear nested flag |
141 | # overwrites %ecx |
141 | # overwrites %ecx |
142 | .macro CLEAR_NT_FLAG |
142 | .macro CLEAR_NT_FLAG |
143 | pushfl |
143 | pushfl |
144 | pop %ecx |
144 | pop %ecx |
145 | and $0xffffbfff, %ecx |
145 | and $0xffffbfff, %ecx |
146 | push %ecx |
146 | push %ecx |
147 | popfl |
147 | popfl |
148 | .endm |
148 | .endm |
149 | 149 | ||
150 | /* |
150 | /* |
151 | * The SYSENTER syscall mechanism can be used for syscalls with |
151 | * The SYSENTER syscall mechanism can be used for syscalls with |
152 | * four or fewer arguments. To pass these four arguments, we |
152 | * four or fewer arguments. To pass these four arguments, we |
153 | * use four registers: EDX, ECX, EBX, ESI. The syscall number |
153 | * use four registers: EDX, ECX, EBX, ESI. The syscall number |
154 | * is passed in EAX. We use EDI to remember the return address |
154 | * is passed in EAX. We use EDI to remember the return address |
155 | * and EBP to remember the stack. The INT-based syscall mechanism |
155 | * and EBP to remember the stack. The INT-based syscall mechanism |
156 | * can actually handle six arguments plus the syscall number |
156 | * can actually handle six arguments plus the syscall number |
157 | * entirely in registers. |
157 | * entirely in registers. |
158 | */ |
158 | */ |
159 | .global sysenter_handler |
159 | .global sysenter_handler |
160 | sysenter_handler: |
160 | sysenter_handler: |
161 | sti |
161 | sti |
162 | pushl %ebp # remember user stack |
162 | pushl %ebp # remember user stack |
163 | pushl %edi # remember return user address |
163 | pushl %edi # remember return user address |
164 | 164 | ||
165 | pushl %gs # remember TLS |
165 | pushl %gs # remember TLS |
166 | 166 | ||
167 | pushl %eax # syscall number |
167 | pushl %eax # syscall number |
168 | subl $8, %esp # unused sixth and fifth argument |
168 | subl $8, %esp # unused sixth and fifth argument |
169 | pushl %esi # fourth argument |
169 | pushl %esi # fourth argument |
170 | pushl %ebx # third argument |
170 | pushl %ebx # third argument |
171 | pushl %ecx # second argument |
171 | pushl %ecx # second argument |
172 | pushl %edx # first argument |
172 | pushl %edx # first argument |
173 | 173 | ||
174 | movw $16, %ax |
174 | movw $16, %ax |
175 | movw %ax, %ds |
175 | movw %ax, %ds |
176 | movw %ax, %es |
176 | movw %ax, %es |
177 | 177 | ||
178 | cld |
178 | cld |
179 | call syscall_handler |
179 | call syscall_handler |
180 | addl $28, %esp # remove arguments from stack |
180 | addl $28, %esp # remove arguments from stack |
181 | 181 | ||
182 | pop %gs # restore TLS |
182 | pop %gs # restore TLS |
183 | 183 | ||
184 | pop %edx # prepare return EIP for SYSEXIT |
184 | pop %edx # prepare return EIP for SYSEXIT |
185 | pop %ecx # prepare userspace ESP for SYSEXIT |
185 | pop %ecx # prepare userspace ESP for SYSEXIT |
186 | 186 | ||
187 | sysexit # return to userspace |
187 | sysexit # return to userspace |
188 | 188 | ||
189 | 189 | ||
190 | ## Declare interrupt handlers |
190 | ## Declare interrupt handlers |
191 | # |
191 | # |
192 | # Declare interrupt handlers for n interrupt |
192 | # Declare interrupt handlers for n interrupt |
193 | # vectors starting at vector i. |
193 | # vectors starting at vector i. |
194 | # |
194 | # |
195 | # The handlers setup data segment registers |
195 | # The handlers setup data segment registers |
196 | # and call exc_dispatch(). |
196 | # and call exc_dispatch(). |
197 | # |
197 | # |
198 | #define INTERRUPT_ALIGN 64 |
198 | #define INTERRUPT_ALIGN 64 |
199 | .macro handler i n |
199 | .macro handler i n |
200 | 200 | ||
201 | .ifeq \i - 0x30 # Syscall handler |
201 | .ifeq \i - 0x30 # Syscall handler |
202 | pushl %ds |
202 | pushl %ds |
203 | pushl %es |
203 | pushl %es |
204 | pushl %fs |
204 | pushl %fs |
205 | pushl %gs |
205 | pushl %gs |
206 | 206 | ||
207 | # |
207 | # |
208 | # Push syscall arguments onto the stack |
208 | # Push syscall arguments onto the stack |
209 | # |
209 | # |
210 | # NOTE: The idea behind the order of arguments passed in registers is to |
210 | # NOTE: The idea behind the order of arguments passed in registers is to |
211 | # use all scratch registers first and preserved registers next. |
211 | # use all scratch registers first and preserved registers next. |
212 | # An optimized libc syscall wrapper can make use of this setup. |
212 | # An optimized libc syscall wrapper can make use of this setup. |
213 | # |
213 | # |
214 | pushl %eax |
214 | pushl %eax |
215 | pushl %ebp |
215 | pushl %ebp |
216 | pushl %edi |
216 | pushl %edi |
217 | pushl %esi |
217 | pushl %esi |
218 | pushl %ebx |
218 | pushl %ebx |
219 | pushl %ecx |
219 | pushl %ecx |
220 | pushl %edx |
220 | pushl %edx |
221 | 221 | ||
222 | # we must fill the data segment registers |
222 | # we must fill the data segment registers |
223 | movw $16, %ax |
223 | movw $16, %ax |
224 | movw %ax, %ds |
224 | movw %ax, %ds |
225 | movw %ax, %es |
225 | movw %ax, %es |
226 | 226 | ||
227 | cld |
227 | cld |
228 | sti |
228 | sti |
229 | # syscall_handler(edx, ecx, ebx, esi, edi, ebp, eax) |
229 | # syscall_handler(edx, ecx, ebx, esi, edi, ebp, eax) |
230 | call syscall_handler |
230 | call syscall_handler |
231 | cli |
231 | cli |
232 | addl $28, %esp # clean-up of parameters |
232 | addl $28, %esp # clean-up of parameters |
233 | 233 | ||
234 | popl %gs |
234 | popl %gs |
235 | popl %fs |
235 | popl %fs |
236 | popl %es |
236 | popl %es |
237 | popl %ds |
237 | popl %ds |
238 | 238 | ||
239 | CLEAR_NT_FLAG |
239 | CLEAR_NT_FLAG |
240 | iret |
240 | iret |
241 | .else |
241 | .else |
242 | /* |
242 | /* |
243 | * This macro distinguishes between two versions of ia32 exceptions. |
243 | * This macro distinguishes between two versions of ia32 exceptions. |
244 | * One version has error word and the other does not have it. |
244 | * One version has error word and the other does not have it. |
245 | * The latter version fakes the error word on the stack so that the |
245 | * The latter version fakes the error word on the stack so that the |
246 | * handlers and istate_t can be the same for both types. |
246 | * handlers and istate_t can be the same for both types. |
247 | */ |
247 | */ |
248 | .iflt \i - 32 |
248 | .iflt \i - 32 |
249 | .if (1 << \i) & ERROR_WORD_INTERRUPT_LIST |
249 | .if (1 << \i) & ERROR_WORD_INTERRUPT_LIST |
250 | /* |
250 | /* |
251 | * With error word, do nothing |
251 | * With error word, do nothing |
252 | */ |
252 | */ |
253 | .else |
253 | .else |
254 | /* |
254 | /* |
255 | * Version without error word, |
255 | * Version without error word, |
256 | */ |
256 | */ |
257 | subl $4, %esp |
257 | subl $4, %esp |
258 | .endif |
258 | .endif |
259 | .else |
259 | .else |
260 | /* |
260 | /* |
261 | * Version without error word, |
261 | * Version without error word, |
262 | */ |
262 | */ |
263 | subl $4, %esp |
263 | subl $4, %esp |
264 | .endif |
264 | .endif |
265 | 265 | ||
266 | pushl %ds |
266 | pushl %ds |
267 | pushl %es |
267 | pushl %es |
268 | pushl %fs |
268 | pushl %fs |
269 | pushl %gs |
269 | pushl %gs |
270 | 270 | ||
271 | #ifdef CONFIG_DEBUG_ALLREGS |
- | |
272 | pushl %ebx |
- | |
273 | pushl %ebp |
- | |
274 | pushl %edi |
- | |
275 | pushl %esi |
- | |
276 | #else |
- | |
277 | subl $16, %esp |
- | |
278 | #endif |
- | |
279 | pushl %edx |
271 | pushl %edx |
280 | pushl %ecx |
272 | pushl %ecx |
281 | pushl %eax |
273 | pushl %eax |
282 | 274 | ||
283 | # we must fill the data segment registers |
275 | # we must fill the data segment registers |
284 | movw $16, %ax |
276 | movw $16, %ax |
285 | movw %ax, %ds |
277 | movw %ax, %ds |
286 | movw %ax, %es |
278 | movw %ax, %es |
287 | 279 | ||
288 | cld |
280 | cld |
289 | 281 | ||
290 | pushl %esp # *istate |
282 | pushl %esp # *istate |
291 | pushl $(\i) # intnum |
283 | pushl $(\i) # intnum |
292 | call exc_dispatch # excdispatch(intnum, *istate) |
284 | call exc_dispatch # excdispatch(intnum, *istate) |
293 | addl $8, %esp # Clear arguments from stack |
285 | addl $8, %esp # Clear arguments from stack |
294 | 286 | ||
295 | CLEAR_NT_FLAG # Modifies %ecx |
287 | CLEAR_NT_FLAG # Modifies %ecx |
296 | 288 | ||
297 | popl %eax |
289 | popl %eax |
298 | popl %ecx |
290 | popl %ecx |
299 | popl %edx |
291 | popl %edx |
300 | #ifdef CONFIG_DEBUG_ALLREGS |
- | |
301 | popl %esi |
- | |
302 | popl %edi |
- | |
303 | popl %ebp |
- | |
304 | popl %ebx |
- | |
305 | #else |
- | |
306 | addl $16, %esp |
- | |
307 | #endif |
- | |
308 | 292 | ||
309 | popl %gs |
293 | popl %gs |
310 | popl %fs |
294 | popl %fs |
311 | popl %es |
295 | popl %es |
312 | popl %ds |
296 | popl %ds |
313 | 297 | ||
314 | addl $4, %esp # Skip error word, no matter whether real or fake. |
298 | addl $4, %esp # Skip error word, no matter whether real or fake. |
315 | iret |
299 | iret |
316 | .endif |
300 | .endif |
317 | 301 | ||
318 | .align INTERRUPT_ALIGN |
302 | .align INTERRUPT_ALIGN |
319 | .if (\n- \i) - 1 |
303 | .if (\n- \i) - 1 |
320 | handler "(\i + 1)", \n |
304 | handler "(\i + 1)", \n |
321 | .endif |
305 | .endif |
322 | .endm |
306 | .endm |
323 | 307 | ||
324 | # keep in sync with pm.h !!! |
308 | # keep in sync with pm.h !!! |
325 | IDT_ITEMS = 64 |
309 | IDT_ITEMS = 64 |
326 | .align INTERRUPT_ALIGN |
310 | .align INTERRUPT_ALIGN |
327 | interrupt_handlers: |
311 | interrupt_handlers: |
328 | h_start: |
312 | h_start: |
329 | handler 0 IDT_ITEMS |
313 | handler 0 IDT_ITEMS |
330 | h_end: |
314 | h_end: |
331 | 315 | ||
332 | .data |
316 | .data |
333 | .global interrupt_handler_size |
317 | .global interrupt_handler_size |
334 | 318 | ||
335 | interrupt_handler_size: .long (h_end - h_start) / IDT_ITEMS |
319 | interrupt_handler_size: .long (h_end - h_start) / IDT_ITEMS |
336 | 320 |