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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 | pushl %ebp # remember user stack |
162 | pushl %ebp # remember user stack |
162 | pushl %edi # remember return user address |
163 | pushl %edi # remember return user address |
163 | 164 | ||
164 | pushl %gs # remember TLS |
165 | pushl %gs # remember TLS |
165 | 166 | ||
166 | pushl %eax # syscall number |
167 | pushl %eax # syscall number |
167 | subl $8, %esp # unused sixth and fifth argument |
168 | subl $8, %esp # unused sixth and fifth argument |
168 | pushl %esi # fourth argument |
169 | pushl %esi # fourth argument |
169 | pushl %ebx # third argument |
170 | pushl %ebx # third argument |
170 | pushl %ecx # second argument |
171 | pushl %ecx # second argument |
171 | pushl %edx # first argument |
172 | pushl %edx # first argument |
172 | 173 | ||
173 | movw $16, %ax |
174 | movw $16, %ax |
174 | movw %ax, %ds |
175 | movw %ax, %ds |
175 | movw %ax, %es |
176 | movw %ax, %es |
176 | 177 | ||
177 | cld |
178 | cld |
178 | call syscall_handler |
179 | call syscall_handler |
179 | addl $28, %esp # remove arguments from stack |
180 | addl $28, %esp # remove arguments from stack |
180 | 181 | ||
181 | pop %gs # restore TLS |
182 | pop %gs # restore TLS |
182 | 183 | ||
183 | pop %edx # prepare return EIP for SYSEXIT |
184 | pop %edx # prepare return EIP for SYSEXIT |
184 | pop %ecx # prepare userspace ESP for SYSEXIT |
185 | pop %ecx # prepare userspace ESP for SYSEXIT |
185 | 186 | ||
186 | sysexit # return to userspace |
187 | sysexit # return to userspace |
187 | 188 | ||
188 | 189 | ||
189 | ## Declare interrupt handlers |
190 | ## Declare interrupt handlers |
190 | # |
191 | # |
191 | # Declare interrupt handlers for n interrupt |
192 | # Declare interrupt handlers for n interrupt |
192 | # vectors starting at vector i. |
193 | # vectors starting at vector i. |
193 | # |
194 | # |
194 | # The handlers setup data segment registers |
195 | # The handlers setup data segment registers |
195 | # and call exc_dispatch(). |
196 | # and call exc_dispatch(). |
196 | # |
197 | # |
197 | #define INTERRUPT_ALIGN 64 |
198 | #define INTERRUPT_ALIGN 64 |
198 | .macro handler i n |
199 | .macro handler i n |
199 | 200 | ||
200 | .ifeq \i - 0x30 # Syscall handler |
201 | .ifeq \i - 0x30 # Syscall handler |
201 | pushl %ds |
202 | pushl %ds |
202 | pushl %es |
203 | pushl %es |
203 | pushl %fs |
204 | pushl %fs |
204 | pushl %gs |
205 | pushl %gs |
205 | 206 | ||
206 | # |
207 | # |
207 | # Push syscall arguments onto the stack |
208 | # Push syscall arguments onto the stack |
208 | # |
209 | # |
209 | # 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 |
210 | # use all scratch registers first and preserved registers next. |
211 | # use all scratch registers first and preserved registers next. |
211 | # An optimized libc syscall wrapper can make use of this setup. |
212 | # An optimized libc syscall wrapper can make use of this setup. |
212 | # |
213 | # |
213 | pushl %eax |
214 | pushl %eax |
214 | pushl %ebp |
215 | pushl %ebp |
215 | pushl %edi |
216 | pushl %edi |
216 | pushl %esi |
217 | pushl %esi |
217 | pushl %ebx |
218 | pushl %ebx |
218 | pushl %ecx |
219 | pushl %ecx |
219 | pushl %edx |
220 | pushl %edx |
220 | 221 | ||
221 | # we must fill the data segment registers |
222 | # we must fill the data segment registers |
222 | movw $16, %ax |
223 | movw $16, %ax |
223 | movw %ax, %ds |
224 | movw %ax, %ds |
224 | movw %ax, %es |
225 | movw %ax, %es |
225 | 226 | ||
226 | cld |
227 | cld |
227 | sti |
228 | sti |
228 | # syscall_handler(edx, ecx, ebx, esi, edi, ebp, eax) |
229 | # syscall_handler(edx, ecx, ebx, esi, edi, ebp, eax) |
229 | call syscall_handler |
230 | call syscall_handler |
230 | cli |
231 | cli |
231 | addl $28, %esp # clean-up of parameters |
232 | addl $28, %esp # clean-up of parameters |
232 | 233 | ||
233 | popl %gs |
234 | popl %gs |
234 | popl %fs |
235 | popl %fs |
235 | popl %es |
236 | popl %es |
236 | popl %ds |
237 | popl %ds |
237 | 238 | ||
238 | CLEAR_NT_FLAG |
239 | CLEAR_NT_FLAG |
239 | iret |
240 | iret |
240 | .else |
241 | .else |
241 | /* |
242 | /* |
242 | * This macro distinguishes between two versions of ia32 exceptions. |
243 | * This macro distinguishes between two versions of ia32 exceptions. |
243 | * 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. |
244 | * 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 |
245 | * handlers and istate_t can be the same for both types. |
246 | * handlers and istate_t can be the same for both types. |
246 | */ |
247 | */ |
247 | .iflt \i - 32 |
248 | .iflt \i - 32 |
248 | .if (1 << \i) & ERROR_WORD_INTERRUPT_LIST |
249 | .if (1 << \i) & ERROR_WORD_INTERRUPT_LIST |
249 | /* |
250 | /* |
250 | * With error word, do nothing |
251 | * With error word, do nothing |
251 | */ |
252 | */ |
252 | .else |
253 | .else |
253 | /* |
254 | /* |
254 | * Version without error word, |
255 | * Version without error word, |
255 | */ |
256 | */ |
256 | subl $4, %esp |
257 | subl $4, %esp |
257 | .endif |
258 | .endif |
258 | .else |
259 | .else |
259 | /* |
260 | /* |
260 | * Version without error word, |
261 | * Version without error word, |
261 | */ |
262 | */ |
262 | subl $4, %esp |
263 | subl $4, %esp |
263 | .endif |
264 | .endif |
264 | 265 | ||
265 | pushl %ds |
266 | pushl %ds |
266 | pushl %es |
267 | pushl %es |
267 | pushl %fs |
268 | pushl %fs |
268 | pushl %gs |
269 | pushl %gs |
269 | 270 | ||
270 | #ifdef CONFIG_DEBUG_ALLREGS |
271 | #ifdef CONFIG_DEBUG_ALLREGS |
271 | pushl %ebx |
272 | pushl %ebx |
272 | pushl %ebp |
273 | pushl %ebp |
273 | pushl %edi |
274 | pushl %edi |
274 | pushl %esi |
275 | pushl %esi |
275 | #else |
276 | #else |
276 | subl $16, %esp |
277 | subl $16, %esp |
277 | #endif |
278 | #endif |
278 | pushl %edx |
279 | pushl %edx |
279 | pushl %ecx |
280 | pushl %ecx |
280 | pushl %eax |
281 | pushl %eax |
281 | 282 | ||
282 | # we must fill the data segment registers |
283 | # we must fill the data segment registers |
283 | movw $16, %ax |
284 | movw $16, %ax |
284 | movw %ax, %ds |
285 | movw %ax, %ds |
285 | movw %ax, %es |
286 | movw %ax, %es |
286 | 287 | ||
287 | cld |
288 | cld |
288 | 289 | ||
289 | pushl %esp # *istate |
290 | pushl %esp # *istate |
290 | pushl $(\i) # intnum |
291 | pushl $(\i) # intnum |
291 | call exc_dispatch # excdispatch(intnum, *istate) |
292 | call exc_dispatch # excdispatch(intnum, *istate) |
292 | addl $8, %esp # Clear arguments from stack |
293 | addl $8, %esp # Clear arguments from stack |
293 | 294 | ||
294 | CLEAR_NT_FLAG # Modifies %ecx |
295 | CLEAR_NT_FLAG # Modifies %ecx |
295 | 296 | ||
296 | popl %eax |
297 | popl %eax |
297 | popl %ecx |
298 | popl %ecx |
298 | popl %edx |
299 | popl %edx |
299 | #ifdef CONFIG_DEBUG_ALLREGS |
300 | #ifdef CONFIG_DEBUG_ALLREGS |
300 | popl %esi |
301 | popl %esi |
301 | popl %edi |
302 | popl %edi |
302 | popl %ebp |
303 | popl %ebp |
303 | popl %ebx |
304 | popl %ebx |
304 | #else |
305 | #else |
305 | addl $16, %esp |
306 | addl $16, %esp |
306 | #endif |
307 | #endif |
307 | 308 | ||
308 | popl %gs |
309 | popl %gs |
309 | popl %fs |
310 | popl %fs |
310 | popl %es |
311 | popl %es |
311 | popl %ds |
312 | popl %ds |
312 | 313 | ||
313 | addl $4, %esp # Skip error word, no matter whether real or fake. |
314 | addl $4, %esp # Skip error word, no matter whether real or fake. |
314 | iret |
315 | iret |
315 | .endif |
316 | .endif |
316 | 317 | ||
317 | .align INTERRUPT_ALIGN |
318 | .align INTERRUPT_ALIGN |
318 | .if (\n- \i) - 1 |
319 | .if (\n- \i) - 1 |
319 | handler "(\i + 1)", \n |
320 | handler "(\i + 1)", \n |
320 | .endif |
321 | .endif |
321 | .endm |
322 | .endm |
322 | 323 | ||
323 | # keep in sync with pm.h !!! |
324 | # keep in sync with pm.h !!! |
324 | IDT_ITEMS = 64 |
325 | IDT_ITEMS = 64 |
325 | .align INTERRUPT_ALIGN |
326 | .align INTERRUPT_ALIGN |
326 | interrupt_handlers: |
327 | interrupt_handlers: |
327 | h_start: |
328 | h_start: |
328 | handler 0 IDT_ITEMS |
329 | handler 0 IDT_ITEMS |
329 | h_end: |
330 | h_end: |
330 | 331 | ||
331 | .data |
332 | .data |
332 | .global interrupt_handler_size |
333 | .global interrupt_handler_size |
333 | 334 | ||
334 | interrupt_handler_size: .long (h_end - h_start) / IDT_ITEMS |
335 | interrupt_handler_size: .long (h_end - h_start) / IDT_ITEMS |
335 | 336 |