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1da177e4 LT |
1 | /* |
2 | * This file contains the light-weight system call handlers (fsyscall-handlers). | |
3 | * | |
4 | * Copyright (C) 2003 Hewlett-Packard Co | |
5 | * David Mosberger-Tang <davidm@hpl.hp.com> | |
6 | * | |
7 | * 25-Sep-03 davidm Implement fsys_rt_sigprocmask(). | |
8 | * 18-Feb-03 louisk Implement fsys_gettimeofday(). | |
9 | * 28-Feb-03 davidm Fixed several bugs in fsys_gettimeofday(). Tuned it some more, | |
10 | * probably broke it along the way... ;-) | |
11 | * 13-Jul-04 clameter Implement fsys_clock_gettime and revise fsys_gettimeofday to make | |
12 | * it capable of using memory based clocks without falling back to C code. | |
3bc207d2 FY |
13 | * 08-Feb-07 Fenghua Yu Implement fsys_getcpu. |
14 | * | |
1da177e4 LT |
15 | */ |
16 | ||
17 | #include <asm/asmmacro.h> | |
18 | #include <asm/errno.h> | |
39e01cb8 | 19 | #include <asm/asm-offsets.h> |
1da177e4 LT |
20 | #include <asm/percpu.h> |
21 | #include <asm/thread_info.h> | |
22 | #include <asm/sal.h> | |
23 | #include <asm/signal.h> | |
1da177e4 LT |
24 | #include <asm/unistd.h> |
25 | ||
26 | #include "entry.h" | |
e55645ec | 27 | #include <asm/native/inst.h> |
1da177e4 LT |
28 | |
29 | /* | |
30 | * See Documentation/ia64/fsys.txt for details on fsyscalls. | |
31 | * | |
32 | * On entry to an fsyscall handler: | |
33 | * r10 = 0 (i.e., defaults to "successful syscall return") | |
34 | * r11 = saved ar.pfs (a user-level value) | |
35 | * r15 = system call number | |
36 | * r16 = "current" task pointer (in normal kernel-mode, this is in r13) | |
37 | * r32-r39 = system call arguments | |
38 | * b6 = return address (a user-level value) | |
39 | * ar.pfs = previous frame-state (a user-level value) | |
40 | * PSR.be = cleared to zero (i.e., little-endian byte order is in effect) | |
41 | * all other registers may contain values passed in from user-mode | |
42 | * | |
43 | * On return from an fsyscall handler: | |
44 | * r11 = saved ar.pfs (as passed into the fsyscall handler) | |
45 | * r15 = system call number (as passed into the fsyscall handler) | |
46 | * r32-r39 = system call arguments (as passed into the fsyscall handler) | |
47 | * b6 = return address (as passed into the fsyscall handler) | |
48 | * ar.pfs = previous frame-state (as passed into the fsyscall handler) | |
49 | */ | |
50 | ||
51 | ENTRY(fsys_ni_syscall) | |
52 | .prologue | |
53 | .altrp b6 | |
54 | .body | |
55 | mov r8=ENOSYS | |
56 | mov r10=-1 | |
57 | FSYS_RETURN | |
58 | END(fsys_ni_syscall) | |
59 | ||
60 | ENTRY(fsys_getpid) | |
61 | .prologue | |
62 | .altrp b6 | |
63 | .body | |
96ded9da PE |
64 | add r17=IA64_TASK_GROUP_LEADER_OFFSET,r16 |
65 | ;; | |
66 | ld8 r17=[r17] // r17 = current->group_leader | |
1da177e4 LT |
67 | add r9=TI_FLAGS+IA64_TASK_SIZE,r16 |
68 | ;; | |
69 | ld4 r9=[r9] | |
96ded9da | 70 | add r17=IA64_TASK_TGIDLINK_OFFSET,r17 |
1da177e4 LT |
71 | ;; |
72 | and r9=TIF_ALLWORK_MASK,r9 | |
96ded9da PE |
73 | ld8 r17=[r17] // r17 = current->group_leader->pids[PIDTYPE_PID].pid |
74 | ;; | |
75 | add r8=IA64_PID_LEVEL_OFFSET,r17 | |
76 | ;; | |
77 | ld4 r8=[r8] // r8 = pid->level | |
78 | add r17=IA64_PID_UPID_OFFSET,r17 // r17 = &pid->numbers[0] | |
79 | ;; | |
80 | shl r8=r8,IA64_UPID_SHIFT | |
81 | ;; | |
82 | add r17=r17,r8 // r17 = &pid->numbers[pid->level] | |
83 | ;; | |
84 | ld4 r8=[r17] // r8 = pid->numbers[pid->level].nr | |
85 | ;; | |
86 | mov r17=0 | |
1da177e4 LT |
87 | ;; |
88 | cmp.ne p8,p0=0,r9 | |
89 | (p8) br.spnt.many fsys_fallback_syscall | |
90 | FSYS_RETURN | |
91 | END(fsys_getpid) | |
92 | ||
1da177e4 LT |
93 | ENTRY(fsys_set_tid_address) |
94 | .prologue | |
95 | .altrp b6 | |
96 | .body | |
97 | add r9=TI_FLAGS+IA64_TASK_SIZE,r16 | |
96ded9da | 98 | add r17=IA64_TASK_TGIDLINK_OFFSET,r16 |
1da177e4 LT |
99 | ;; |
100 | ld4 r9=[r9] | |
101 | tnat.z p6,p7=r32 // check argument register for being NaT | |
96ded9da | 102 | ld8 r17=[r17] // r17 = current->pids[PIDTYPE_PID].pid |
1da177e4 LT |
103 | ;; |
104 | and r9=TIF_ALLWORK_MASK,r9 | |
96ded9da | 105 | add r8=IA64_PID_LEVEL_OFFSET,r17 |
1da177e4 LT |
106 | add r18=IA64_TASK_CLEAR_CHILD_TID_OFFSET,r16 |
107 | ;; | |
96ded9da PE |
108 | ld4 r8=[r8] // r8 = pid->level |
109 | add r17=IA64_PID_UPID_OFFSET,r17 // r17 = &pid->numbers[0] | |
110 | ;; | |
111 | shl r8=r8,IA64_UPID_SHIFT | |
112 | ;; | |
113 | add r17=r17,r8 // r17 = &pid->numbers[pid->level] | |
114 | ;; | |
115 | ld4 r8=[r17] // r8 = pid->numbers[pid->level].nr | |
116 | ;; | |
1da177e4 LT |
117 | cmp.ne p8,p0=0,r9 |
118 | mov r17=-1 | |
119 | ;; | |
120 | (p6) st8 [r18]=r32 | |
121 | (p7) st8 [r18]=r17 | |
122 | (p8) br.spnt.many fsys_fallback_syscall | |
123 | ;; | |
124 | mov r17=0 // i must not leak kernel bits... | |
125 | mov r18=0 // i must not leak kernel bits... | |
126 | FSYS_RETURN | |
127 | END(fsys_set_tid_address) | |
128 | ||
74a622be | 129 | #if IA64_GTOD_SEQ_OFFSET !=0 |
0aa366f3 TL |
130 | #error fsys_gettimeofday incompatible with changes to struct fsyscall_gtod_data_t |
131 | #endif | |
132 | #if IA64_ITC_JITTER_OFFSET !=0 | |
133 | #error fsys_gettimeofday incompatible with changes to struct itc_jitter_data_t | |
1da177e4 LT |
134 | #endif |
135 | #define CLOCK_REALTIME 0 | |
136 | #define CLOCK_MONOTONIC 1 | |
137 | #define CLOCK_DIVIDE_BY_1000 0x4000 | |
138 | #define CLOCK_ADD_MONOTONIC 0x8000 | |
139 | ||
140 | ENTRY(fsys_gettimeofday) | |
141 | .prologue | |
142 | .altrp b6 | |
143 | .body | |
144 | mov r31 = r32 | |
145 | tnat.nz p6,p0 = r33 // guard against NaT argument | |
146 | (p6) br.cond.spnt.few .fail_einval | |
147 | mov r30 = CLOCK_DIVIDE_BY_1000 | |
148 | ;; | |
149 | .gettime: | |
150 | // Register map | |
151 | // Incoming r31 = pointer to address where to place result | |
152 | // r30 = flags determining how time is processed | |
153 | // r2,r3 = temp r4-r7 preserved | |
154 | // r8 = result nanoseconds | |
155 | // r9 = result seconds | |
156 | // r10 = temporary storage for clock difference | |
157 | // r11 = preserved: saved ar.pfs | |
158 | // r12 = preserved: memory stack | |
159 | // r13 = preserved: thread pointer | |
0aa366f3 | 160 | // r14 = address of mask / mask value |
1da177e4 LT |
161 | // r15 = preserved: system call number |
162 | // r16 = preserved: current task pointer | |
0aa366f3 TL |
163 | // r17 = (not used) |
164 | // r18 = (not used) | |
165 | // r19 = address of itc_lastcycle | |
166 | // r20 = struct fsyscall_gtod_data (= address of gtod_lock.sequence) | |
167 | // r21 = address of mmio_ptr | |
168 | // r22 = address of wall_time or monotonic_time | |
169 | // r23 = address of shift / value | |
170 | // r24 = address mult factor / cycle_last value | |
171 | // r25 = itc_lastcycle value | |
172 | // r26 = address clocksource cycle_last | |
173 | // r27 = (not used) | |
1da177e4 | 174 | // r28 = sequence number at the beginning of critcal section |
0aa366f3 | 175 | // r29 = address of itc_jitter |
1da177e4 LT |
176 | // r30 = time processing flags / memory address |
177 | // r31 = pointer to result | |
178 | // Predicates | |
179 | // p6,p7 short term use | |
180 | // p8 = timesource ar.itc | |
181 | // p9 = timesource mmio64 | |
0aa366f3 | 182 | // p10 = timesource mmio32 - not used |
1da177e4 | 183 | // p11 = timesource not to be handled by asm code |
0aa366f3 TL |
184 | // p12 = memory time source ( = p9 | p10) - not used |
185 | // p13 = do cmpxchg with itc_lastcycle | |
1da177e4 LT |
186 | // p14 = Divide by 1000 |
187 | // p15 = Add monotonic | |
188 | // | |
0aa366f3 TL |
189 | // Note that instructions are optimized for McKinley. McKinley can |
190 | // process two bundles simultaneously and therefore we continuously | |
191 | // try to feed the CPU two bundles and then a stop. | |
4fe01c68 | 192 | |
1da177e4 | 193 | add r2 = TI_FLAGS+IA64_TASK_SIZE,r16 |
4fe01c68 HS |
194 | tnat.nz p6,p0 = r31 // guard against Nat argument |
195 | (p6) br.cond.spnt.few .fail_einval | |
0aa366f3 | 196 | movl r20 = fsyscall_gtod_data // load fsyscall gettimeofday data address |
1da177e4 | 197 | ;; |
4fe01c68 | 198 | ld4 r2 = [r2] // process work pending flags |
0aa366f3 TL |
199 | movl r29 = itc_jitter_data // itc_jitter |
200 | add r22 = IA64_GTOD_WALL_TIME_OFFSET,r20 // wall_time | |
0aa366f3 | 201 | add r21 = IA64_CLKSRC_MMIO_OFFSET,r20 |
4fe01c68 HS |
202 | mov pr = r30,0xc000 // Set predicates according to function |
203 | ;; | |
1da177e4 | 204 | and r2 = TIF_ALLWORK_MASK,r2 |
4fe01c68 HS |
205 | add r19 = IA64_ITC_LASTCYCLE_OFFSET,r29 |
206 | (p15) add r22 = IA64_GTOD_MONO_TIME_OFFSET,r20 // monotonic_time | |
1da177e4 | 207 | ;; |
4fe01c68 | 208 | add r26 = IA64_CLKSRC_CYCLE_LAST_OFFSET,r20 // clksrc_cycle_last |
1da177e4 | 209 | cmp.ne p6, p0 = 0, r2 // Fallback if work is scheduled |
4fe01c68 | 210 | (p6) br.cond.spnt.many fsys_fallback_syscall |
1da177e4 | 211 | ;; |
0aa366f3 TL |
212 | // Begin critical section |
213 | .time_redo: | |
214 | ld4.acq r28 = [r20] // gtod_lock.sequence, Must take first | |
215 | ;; | |
216 | and r28 = ~1,r28 // And make sequence even to force retry if odd | |
1da177e4 | 217 | ;; |
0aa366f3 TL |
218 | ld8 r30 = [r21] // clocksource->mmio_ptr |
219 | add r24 = IA64_CLKSRC_MULT_OFFSET,r20 | |
220 | ld4 r2 = [r29] // itc_jitter value | |
221 | add r23 = IA64_CLKSRC_SHIFT_OFFSET,r20 | |
222 | add r14 = IA64_CLKSRC_MASK_OFFSET,r20 | |
1da177e4 | 223 | ;; |
0aa366f3 TL |
224 | ld4 r3 = [r24] // clocksource mult value |
225 | ld8 r14 = [r14] // clocksource mask value | |
226 | cmp.eq p8,p9 = 0,r30 // use cpu timer if no mmio_ptr | |
829a9996 | 227 | ;; |
0aa366f3 TL |
228 | setf.sig f7 = r3 // Setup for mult scaling of counter |
229 | (p8) cmp.ne p13,p0 = r2,r0 // need itc_jitter compensation, set p13 | |
230 | ld4 r23 = [r23] // clocksource shift value | |
231 | ld8 r24 = [r26] // get clksrc_cycle_last value | |
232 | (p9) cmp.eq p13,p0 = 0,r30 // if mmio_ptr, clear p13 jitter control | |
829a9996 | 233 | ;; |
0aa366f3 | 234 | .pred.rel.mutex p8,p9 |
94752a79 | 235 | MOV_FROM_ITC(p8, p6, r2, r10) // CPU_TIMER. 36 clocks latency!!! |
0aa366f3 TL |
236 | (p9) ld8 r2 = [r30] // MMIO_TIMER. Could also have latency issues.. |
237 | (p13) ld8 r25 = [r19] // get itc_lastcycle value | |
0aa366f3 TL |
238 | ld8 r9 = [r22],IA64_TIMESPEC_TV_NSEC_OFFSET // tv_sec |
239 | ;; | |
240 | ld8 r8 = [r22],-IA64_TIMESPEC_TV_NSEC_OFFSET // tv_nsec | |
241 | (p13) sub r3 = r25,r2 // Diff needed before comparison (thanks davidm) | |
242 | ;; | |
243 | (p13) cmp.gt.unc p6,p7 = r3,r0 // check if it is less than last. p6,p7 cleared | |
244 | sub r10 = r2,r24 // current_cycle - last_cycle | |
245 | ;; | |
246 | (p6) sub r10 = r25,r24 // time we got was less than last_cycle | |
1da177e4 LT |
247 | (p7) mov ar.ccv = r25 // more than last_cycle. Prep for cmpxchg |
248 | ;; | |
0aa366f3 TL |
249 | (p7) cmpxchg8.rel r3 = [r19],r2,ar.ccv |
250 | ;; | |
251 | (p7) cmp.ne p7,p0 = r25,r3 // if cmpxchg not successful | |
252 | ;; | |
253 | (p7) sub r10 = r3,r24 // then use new last_cycle instead | |
254 | ;; | |
1da177e4 LT |
255 | and r10 = r10,r14 // Apply mask |
256 | ;; | |
257 | setf.sig f8 = r10 | |
258 | nop.i 123 | |
259 | ;; | |
0aa366f3 TL |
260 | // fault check takes 5 cycles and we have spare time |
261 | EX(.fail_efault, probe.w.fault r31, 3) | |
1da177e4 | 262 | xmpy.l f8 = f8,f7 // nsec_per_cyc*(counter-last_counter) |
1da177e4 | 263 | ;; |
1da177e4 LT |
264 | getf.sig r2 = f8 |
265 | mf | |
1da177e4 | 266 | ;; |
0aa366f3 TL |
267 | ld4 r10 = [r20] // gtod_lock.sequence |
268 | shr.u r2 = r2,r23 // shift by factor | |
4fe01c68 | 269 | ;; |
1da177e4 | 270 | add r8 = r8,r2 // Add xtime.nsecs |
0aa366f3 TL |
271 | cmp4.ne p7,p0 = r28,r10 |
272 | (p7) br.cond.dpnt.few .time_redo // sequence number changed, redo | |
273 | // End critical section. | |
1da177e4 LT |
274 | // Now r8=tv->tv_nsec and r9=tv->tv_sec |
275 | mov r10 = r0 | |
276 | movl r2 = 1000000000 | |
277 | add r23 = IA64_TIMESPEC_TV_NSEC_OFFSET, r31 | |
278 | (p14) movl r3 = 2361183241434822607 // Prep for / 1000 hack | |
279 | ;; | |
280 | .time_normalize: | |
281 | mov r21 = r8 | |
282 | cmp.ge p6,p0 = r8,r2 | |
0aa366f3 | 283 | (p14) shr.u r20 = r8, 3 // We can repeat this if necessary just wasting time |
1da177e4 LT |
284 | ;; |
285 | (p14) setf.sig f8 = r20 | |
286 | (p6) sub r8 = r8,r2 | |
0aa366f3 TL |
287 | (p6) add r9 = 1,r9 // two nops before the branch. |
288 | (p14) setf.sig f7 = r3 // Chances for repeats are 1 in 10000 for gettod | |
1da177e4 LT |
289 | (p6) br.cond.dpnt.few .time_normalize |
290 | ;; | |
291 | // Divided by 8 though shift. Now divide by 125 | |
292 | // The compiler was able to do that with a multiply | |
293 | // and a shift and we do the same | |
0aa366f3 TL |
294 | EX(.fail_efault, probe.w.fault r23, 3) // This also costs 5 cycles |
295 | (p14) xmpy.hu f8 = f8, f7 // xmpy has 5 cycles latency so use it | |
1da177e4 | 296 | ;; |
1da177e4 LT |
297 | (p14) getf.sig r2 = f8 |
298 | ;; | |
4fe01c68 | 299 | mov r8 = r0 |
1da177e4 LT |
300 | (p14) shr.u r21 = r2, 4 |
301 | ;; | |
302 | EX(.fail_efault, st8 [r31] = r9) | |
303 | EX(.fail_efault, st8 [r23] = r21) | |
304 | FSYS_RETURN | |
305 | .fail_einval: | |
306 | mov r8 = EINVAL | |
307 | mov r10 = -1 | |
308 | FSYS_RETURN | |
309 | .fail_efault: | |
310 | mov r8 = EFAULT | |
311 | mov r10 = -1 | |
312 | FSYS_RETURN | |
313 | END(fsys_gettimeofday) | |
314 | ||
315 | ENTRY(fsys_clock_gettime) | |
316 | .prologue | |
317 | .altrp b6 | |
318 | .body | |
319 | cmp4.ltu p6, p0 = CLOCK_MONOTONIC, r32 | |
320 | // Fallback if this is not CLOCK_REALTIME or CLOCK_MONOTONIC | |
321 | (p6) br.spnt.few fsys_fallback_syscall | |
322 | mov r31 = r33 | |
323 | shl r30 = r32,15 | |
324 | br.many .gettime | |
325 | END(fsys_clock_gettime) | |
326 | ||
3bc207d2 FY |
327 | /* |
328 | * fsys_getcpu doesn't use the third parameter in this implementation. It reads | |
329 | * current_thread_info()->cpu and corresponding node in cpu_to_node_map. | |
330 | */ | |
331 | ENTRY(fsys_getcpu) | |
332 | .prologue | |
333 | .altrp b6 | |
334 | .body | |
335 | ;; | |
336 | add r2=TI_FLAGS+IA64_TASK_SIZE,r16 | |
337 | tnat.nz p6,p0 = r32 // guard against NaT argument | |
338 | add r3=TI_CPU+IA64_TASK_SIZE,r16 | |
339 | ;; | |
340 | ld4 r3=[r3] // M r3 = thread_info->cpu | |
341 | ld4 r2=[r2] // M r2 = thread_info->flags | |
342 | (p6) br.cond.spnt.few .fail_einval // B | |
343 | ;; | |
344 | tnat.nz p7,p0 = r33 // I guard against NaT argument | |
345 | (p7) br.cond.spnt.few .fail_einval // B | |
7411d895 TL |
346 | ;; |
347 | cmp.ne p6,p0=r32,r0 | |
348 | cmp.ne p7,p0=r33,r0 | |
349 | ;; | |
3bc207d2 FY |
350 | #ifdef CONFIG_NUMA |
351 | movl r17=cpu_to_node_map | |
352 | ;; | |
7411d895 TL |
353 | EX(.fail_efault, (p6) probe.w.fault r32, 3) // M This takes 5 cycles |
354 | EX(.fail_efault, (p7) probe.w.fault r33, 3) // M This takes 5 cycles | |
3bc207d2 FY |
355 | shladd r18=r3,1,r17 |
356 | ;; | |
357 | ld2 r20=[r18] // r20 = cpu_to_node_map[cpu] | |
358 | and r2 = TIF_ALLWORK_MASK,r2 | |
359 | ;; | |
360 | cmp.ne p8,p0=0,r2 | |
361 | (p8) br.spnt.many fsys_fallback_syscall | |
362 | ;; | |
363 | ;; | |
7411d895 TL |
364 | EX(.fail_efault, (p6) st4 [r32] = r3) |
365 | EX(.fail_efault, (p7) st2 [r33] = r20) | |
3bc207d2 FY |
366 | mov r8=0 |
367 | ;; | |
368 | #else | |
7411d895 TL |
369 | EX(.fail_efault, (p6) probe.w.fault r32, 3) // M This takes 5 cycles |
370 | EX(.fail_efault, (p7) probe.w.fault r33, 3) // M This takes 5 cycles | |
3bc207d2 FY |
371 | and r2 = TIF_ALLWORK_MASK,r2 |
372 | ;; | |
373 | cmp.ne p8,p0=0,r2 | |
374 | (p8) br.spnt.many fsys_fallback_syscall | |
375 | ;; | |
7411d895 TL |
376 | EX(.fail_efault, (p6) st4 [r32] = r3) |
377 | EX(.fail_efault, (p7) st2 [r33] = r0) | |
3bc207d2 FY |
378 | mov r8=0 |
379 | ;; | |
380 | #endif | |
381 | FSYS_RETURN | |
382 | END(fsys_getcpu) | |
383 | ||
1da177e4 LT |
384 | ENTRY(fsys_fallback_syscall) |
385 | .prologue | |
386 | .altrp b6 | |
387 | .body | |
388 | /* | |
389 | * We only get here from light-weight syscall handlers. Thus, we already | |
390 | * know that r15 contains a valid syscall number. No need to re-check. | |
391 | */ | |
392 | adds r17=-1024,r15 | |
393 | movl r14=sys_call_table | |
394 | ;; | |
84b8857a | 395 | RSM_PSR_I(p0, r26, r27) |
1da177e4 LT |
396 | shladd r18=r17,3,r14 |
397 | ;; | |
398 | ld8 r18=[r18] // load normal (heavy-weight) syscall entry-point | |
84b8857a | 399 | MOV_FROM_PSR(p0, r29, r26) // read psr (12 cyc load latency) |
1da177e4 LT |
400 | mov r27=ar.rsc |
401 | mov r21=ar.fpsr | |
402 | mov r26=ar.pfs | |
403 | END(fsys_fallback_syscall) | |
404 | /* FALL THROUGH */ | |
e55645ec | 405 | GLOBAL_ENTRY(fsys_bubble_down) |
1da177e4 LT |
406 | .prologue |
407 | .altrp b6 | |
408 | .body | |
409 | /* | |
fbf7192b DMT |
410 | * We get here for syscalls that don't have a lightweight |
411 | * handler. For those, we need to bubble down into the kernel | |
412 | * and that requires setting up a minimal pt_regs structure, | |
413 | * and initializing the CPU state more or less as if an | |
414 | * interruption had occurred. To make syscall-restarts work, | |
415 | * we setup pt_regs such that cr_iip points to the second | |
416 | * instruction in syscall_via_break. Decrementing the IP | |
417 | * hence will restart the syscall via break and not | |
418 | * decrementing IP will return us to the caller, as usual. | |
419 | * Note that we preserve the value of psr.pp rather than | |
420 | * initializing it from dcr.pp. This makes it possible to | |
421 | * distinguish fsyscall execution from other privileged | |
422 | * execution. | |
1da177e4 LT |
423 | * |
424 | * On entry: | |
fbf7192b DMT |
425 | * - normal fsyscall handler register usage, except |
426 | * that we also have: | |
1da177e4 LT |
427 | * - r18: address of syscall entry point |
428 | * - r21: ar.fpsr | |
429 | * - r26: ar.pfs | |
430 | * - r27: ar.rsc | |
431 | * - r29: psr | |
fbf7192b DMT |
432 | * |
433 | * We used to clear some PSR bits here but that requires slow | |
434 | * serialization. Fortuntely, that isn't really necessary. | |
435 | * The rationale is as follows: we used to clear bits | |
436 | * ~PSR_PRESERVED_BITS in PSR.L. Since | |
437 | * PSR_PRESERVED_BITS==PSR.{UP,MFL,MFH,PK,DT,PP,SP,RT,IC}, we | |
438 | * ended up clearing PSR.{BE,AC,I,DFL,DFH,DI,DB,SI,TB}. | |
439 | * However, | |
440 | * | |
441 | * PSR.BE : already is turned off in __kernel_syscall_via_epc() | |
442 | * PSR.AC : don't care (kernel normally turns PSR.AC on) | |
e55645ec | 443 | * PSR.I : already turned off by the time fsys_bubble_down gets |
fbf7192b DMT |
444 | * invoked |
445 | * PSR.DFL: always 0 (kernel never turns it on) | |
446 | * PSR.DFH: don't care --- kernel never touches f32-f127 on its own | |
447 | * initiative | |
448 | * PSR.DI : always 0 (kernel never turns it on) | |
449 | * PSR.SI : always 0 (kernel never turns it on) | |
450 | * PSR.DB : don't care --- kernel never enables kernel-level | |
451 | * breakpoints | |
452 | * PSR.TB : must be 0 already; if it wasn't zero on entry to | |
e55645ec | 453 | * __kernel_syscall_via_epc, the branch to fsys_bubble_down |
fbf7192b DMT |
454 | * will trigger a taken branch; the taken-trap-handler then |
455 | * converts the syscall into a break-based system-call. | |
1da177e4 | 456 | */ |
1da177e4 | 457 | /* |
fbf7192b DMT |
458 | * Reading psr.l gives us only bits 0-31, psr.it, and psr.mc. |
459 | * The rest we have to synthesize. | |
1da177e4 | 460 | */ |
fbf7192b DMT |
461 | # define PSR_ONE_BITS ((3 << IA64_PSR_CPL0_BIT) \ |
462 | | (0x1 << IA64_PSR_RI_BIT) \ | |
1da177e4 LT |
463 | | IA64_PSR_BN | IA64_PSR_I) |
464 | ||
fbf7192b DMT |
465 | invala // M0|1 |
466 | movl r14=ia64_ret_from_syscall // X | |
1da177e4 | 467 | |
1ba7be7d | 468 | nop.m 0 |
fbf7192b | 469 | movl r28=__kernel_syscall_via_break // X create cr.iip |
1da177e4 | 470 | ;; |
1ba7be7d | 471 | |
fbf7192b DMT |
472 | mov r2=r16 // A get task addr to addl-addressable register |
473 | adds r16=IA64_TASK_THREAD_ON_USTACK_OFFSET,r16 // A | |
474 | mov r31=pr // I0 save pr (2 cyc) | |
1da177e4 | 475 | ;; |
fbf7192b DMT |
476 | st1 [r16]=r0 // M2|3 clear current->thread.on_ustack flag |
477 | addl r22=IA64_RBS_OFFSET,r2 // A compute base of RBS | |
478 | add r3=TI_FLAGS+IA64_TASK_SIZE,r2 // A | |
1da177e4 | 479 | ;; |
fbf7192b DMT |
480 | ld4 r3=[r3] // M0|1 r3 = current_thread_info()->flags |
481 | lfetch.fault.excl.nt1 [r22] // M0|1 prefetch register backing-store | |
1ba7be7d | 482 | nop.i 0 |
1da177e4 | 483 | ;; |
fbf7192b | 484 | mov ar.rsc=0 // M2 set enforced lazy mode, pl 0, LE, loadrs=0 |
abf917cd | 485 | #ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE |
94752a79 | 486 | MOV_FROM_ITC(p0, p6, r30, r23) // M get cycle for accounting |
b64f34cd | 487 | #else |
1ba7be7d | 488 | nop.m 0 |
b64f34cd | 489 | #endif |
1ba7be7d DMT |
490 | nop.i 0 |
491 | ;; | |
fbf7192b DMT |
492 | mov r23=ar.bspstore // M2 (12 cyc) save ar.bspstore |
493 | mov.m r24=ar.rnat // M2 (5 cyc) read ar.rnat (dual-issues!) | |
1ba7be7d | 494 | nop.i 0 |
1da177e4 | 495 | ;; |
fbf7192b | 496 | mov ar.bspstore=r22 // M2 (6 cyc) switch to kernel RBS |
1ba7be7d | 497 | movl r8=PSR_ONE_BITS // X |
1da177e4 | 498 | ;; |
fbf7192b DMT |
499 | mov r25=ar.unat // M2 (5 cyc) save ar.unat |
500 | mov r19=b6 // I0 save b6 (2 cyc) | |
501 | mov r20=r1 // A save caller's gp in r20 | |
1ba7be7d | 502 | ;; |
fbf7192b DMT |
503 | or r29=r8,r29 // A construct cr.ipsr value to save |
504 | mov b6=r18 // I0 copy syscall entry-point to b6 (7 cyc) | |
505 | addl r1=IA64_STK_OFFSET-IA64_PT_REGS_SIZE,r2 // A compute base of memory stack | |
1ba7be7d | 506 | |
fbf7192b DMT |
507 | mov r18=ar.bsp // M2 save (kernel) ar.bsp (12 cyc) |
508 | cmp.ne pKStk,pUStk=r0,r0 // A set pKStk <- 0, pUStk <- 1 | |
509 | br.call.sptk.many b7=ia64_syscall_setup // B | |
1da177e4 | 510 | ;; |
abf917cd | 511 | #ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE |
b64f34cd HS |
512 | // mov.m r30=ar.itc is called in advance |
513 | add r16=TI_AC_STAMP+IA64_TASK_SIZE,r2 | |
514 | add r17=TI_AC_LEAVE+IA64_TASK_SIZE,r2 | |
515 | ;; | |
516 | ld8 r18=[r16],TI_AC_STIME-TI_AC_STAMP // time at last check in kernel | |
517 | ld8 r19=[r17],TI_AC_UTIME-TI_AC_LEAVE // time at leave kernel | |
518 | ;; | |
519 | ld8 r20=[r16],TI_AC_STAMP-TI_AC_STIME // cumulated stime | |
520 | ld8 r21=[r17] // cumulated utime | |
521 | sub r22=r19,r18 // stime before leave kernel | |
522 | ;; | |
523 | st8 [r16]=r30,TI_AC_STIME-TI_AC_STAMP // update stamp | |
524 | sub r18=r30,r19 // elapsed time in user mode | |
525 | ;; | |
526 | add r20=r20,r22 // sum stime | |
527 | add r21=r21,r18 // sum utime | |
528 | ;; | |
529 | st8 [r16]=r20 // update stime | |
530 | st8 [r17]=r21 // update utime | |
531 | ;; | |
532 | #endif | |
fbf7192b DMT |
533 | mov ar.rsc=0x3 // M2 set eager mode, pl 0, LE, loadrs=0 |
534 | mov rp=r14 // I0 set the real return addr | |
ebcc80c1 | 535 | and r3=_TIF_SYSCALL_TRACEAUDIT,r3 // A |
1da177e4 | 536 | ;; |
84b8857a | 537 | SSM_PSR_I(p0, p6, r22) // M2 we're on kernel stacks now, reenable irqs |
ebcc80c1 | 538 | cmp.eq p8,p0=r3,r0 // A |
fbf7192b | 539 | (p10) br.cond.spnt.many ia64_ret_from_syscall // B return if bad call-frame or r15 is a NaT |
1ba7be7d DMT |
540 | |
541 | nop.m 0 | |
fbf7192b DMT |
542 | (p8) br.call.sptk.many b6=b6 // B (ignore return address) |
543 | br.cond.spnt ia64_trace_syscall // B | |
e55645ec | 544 | END(fsys_bubble_down) |
1da177e4 LT |
545 | |
546 | .rodata | |
547 | .align 8 | |
e55645ec | 548 | .globl fsyscall_table |
1da177e4 | 549 | |
e55645ec LR |
550 | data8 fsys_bubble_down |
551 | fsyscall_table: | |
1da177e4 LT |
552 | data8 fsys_ni_syscall |
553 | data8 0 // exit // 1025 | |
554 | data8 0 // read | |
555 | data8 0 // write | |
556 | data8 0 // open | |
557 | data8 0 // close | |
558 | data8 0 // creat // 1030 | |
559 | data8 0 // link | |
560 | data8 0 // unlink | |
561 | data8 0 // execve | |
562 | data8 0 // chdir | |
563 | data8 0 // fchdir // 1035 | |
564 | data8 0 // utimes | |
565 | data8 0 // mknod | |
566 | data8 0 // chmod | |
567 | data8 0 // chown | |
568 | data8 0 // lseek // 1040 | |
569 | data8 fsys_getpid // getpid | |
deb60015 | 570 | data8 0 // getppid |
1da177e4 LT |
571 | data8 0 // mount |
572 | data8 0 // umount | |
573 | data8 0 // setuid // 1045 | |
574 | data8 0 // getuid | |
575 | data8 0 // geteuid | |
576 | data8 0 // ptrace | |
577 | data8 0 // access | |
578 | data8 0 // sync // 1050 | |
579 | data8 0 // fsync | |
580 | data8 0 // fdatasync | |
581 | data8 0 // kill | |
582 | data8 0 // rename | |
583 | data8 0 // mkdir // 1055 | |
584 | data8 0 // rmdir | |
585 | data8 0 // dup | |
586 | data8 0 // pipe | |
587 | data8 0 // times | |
588 | data8 0 // brk // 1060 | |
589 | data8 0 // setgid | |
590 | data8 0 // getgid | |
591 | data8 0 // getegid | |
592 | data8 0 // acct | |
593 | data8 0 // ioctl // 1065 | |
594 | data8 0 // fcntl | |
595 | data8 0 // umask | |
596 | data8 0 // chroot | |
597 | data8 0 // ustat | |
598 | data8 0 // dup2 // 1070 | |
599 | data8 0 // setreuid | |
600 | data8 0 // setregid | |
601 | data8 0 // getresuid | |
602 | data8 0 // setresuid | |
603 | data8 0 // getresgid // 1075 | |
604 | data8 0 // setresgid | |
605 | data8 0 // getgroups | |
606 | data8 0 // setgroups | |
607 | data8 0 // getpgid | |
608 | data8 0 // setpgid // 1080 | |
609 | data8 0 // setsid | |
610 | data8 0 // getsid | |
611 | data8 0 // sethostname | |
612 | data8 0 // setrlimit | |
613 | data8 0 // getrlimit // 1085 | |
614 | data8 0 // getrusage | |
615 | data8 fsys_gettimeofday // gettimeofday | |
616 | data8 0 // settimeofday | |
617 | data8 0 // select | |
618 | data8 0 // poll // 1090 | |
619 | data8 0 // symlink | |
620 | data8 0 // readlink | |
621 | data8 0 // uselib | |
622 | data8 0 // swapon | |
623 | data8 0 // swapoff // 1095 | |
624 | data8 0 // reboot | |
625 | data8 0 // truncate | |
626 | data8 0 // ftruncate | |
627 | data8 0 // fchmod | |
628 | data8 0 // fchown // 1100 | |
629 | data8 0 // getpriority | |
630 | data8 0 // setpriority | |
631 | data8 0 // statfs | |
632 | data8 0 // fstatfs | |
633 | data8 0 // gettid // 1105 | |
634 | data8 0 // semget | |
635 | data8 0 // semop | |
636 | data8 0 // semctl | |
637 | data8 0 // msgget | |
638 | data8 0 // msgsnd // 1110 | |
639 | data8 0 // msgrcv | |
640 | data8 0 // msgctl | |
641 | data8 0 // shmget | |
642 | data8 0 // shmat | |
643 | data8 0 // shmdt // 1115 | |
644 | data8 0 // shmctl | |
645 | data8 0 // syslog | |
646 | data8 0 // setitimer | |
647 | data8 0 // getitimer | |
648 | data8 0 // 1120 | |
649 | data8 0 | |
650 | data8 0 | |
651 | data8 0 // vhangup | |
652 | data8 0 // lchown | |
653 | data8 0 // remap_file_pages // 1125 | |
654 | data8 0 // wait4 | |
655 | data8 0 // sysinfo | |
656 | data8 0 // clone | |
657 | data8 0 // setdomainname | |
658 | data8 0 // newuname // 1130 | |
659 | data8 0 // adjtimex | |
660 | data8 0 | |
661 | data8 0 // init_module | |
662 | data8 0 // delete_module | |
663 | data8 0 // 1135 | |
664 | data8 0 | |
665 | data8 0 // quotactl | |
666 | data8 0 // bdflush | |
667 | data8 0 // sysfs | |
668 | data8 0 // personality // 1140 | |
669 | data8 0 // afs_syscall | |
670 | data8 0 // setfsuid | |
671 | data8 0 // setfsgid | |
672 | data8 0 // getdents | |
673 | data8 0 // flock // 1145 | |
674 | data8 0 // readv | |
675 | data8 0 // writev | |
676 | data8 0 // pread64 | |
677 | data8 0 // pwrite64 | |
678 | data8 0 // sysctl // 1150 | |
679 | data8 0 // mmap | |
680 | data8 0 // munmap | |
681 | data8 0 // mlock | |
682 | data8 0 // mlockall | |
683 | data8 0 // mprotect // 1155 | |
684 | data8 0 // mremap | |
685 | data8 0 // msync | |
686 | data8 0 // munlock | |
687 | data8 0 // munlockall | |
688 | data8 0 // sched_getparam // 1160 | |
689 | data8 0 // sched_setparam | |
690 | data8 0 // sched_getscheduler | |
691 | data8 0 // sched_setscheduler | |
692 | data8 0 // sched_yield | |
693 | data8 0 // sched_get_priority_max // 1165 | |
694 | data8 0 // sched_get_priority_min | |
695 | data8 0 // sched_rr_get_interval | |
696 | data8 0 // nanosleep | |
697 | data8 0 // nfsservctl | |
698 | data8 0 // prctl // 1170 | |
699 | data8 0 // getpagesize | |
700 | data8 0 // mmap2 | |
701 | data8 0 // pciconfig_read | |
702 | data8 0 // pciconfig_write | |
703 | data8 0 // perfmonctl // 1175 | |
704 | data8 0 // sigaltstack | |
705 | data8 0 // rt_sigaction | |
706 | data8 0 // rt_sigpending | |
4035c6db | 707 | data8 0 // rt_sigprocmask |
1da177e4 LT |
708 | data8 0 // rt_sigqueueinfo // 1180 |
709 | data8 0 // rt_sigreturn | |
710 | data8 0 // rt_sigsuspend | |
711 | data8 0 // rt_sigtimedwait | |
712 | data8 0 // getcwd | |
713 | data8 0 // capget // 1185 | |
714 | data8 0 // capset | |
715 | data8 0 // sendfile | |
716 | data8 0 | |
717 | data8 0 | |
718 | data8 0 // socket // 1190 | |
719 | data8 0 // bind | |
720 | data8 0 // connect | |
721 | data8 0 // listen | |
722 | data8 0 // accept | |
723 | data8 0 // getsockname // 1195 | |
724 | data8 0 // getpeername | |
725 | data8 0 // socketpair | |
726 | data8 0 // send | |
727 | data8 0 // sendto | |
728 | data8 0 // recv // 1200 | |
729 | data8 0 // recvfrom | |
730 | data8 0 // shutdown | |
731 | data8 0 // setsockopt | |
732 | data8 0 // getsockopt | |
733 | data8 0 // sendmsg // 1205 | |
734 | data8 0 // recvmsg | |
735 | data8 0 // pivot_root | |
736 | data8 0 // mincore | |
737 | data8 0 // madvise | |
738 | data8 0 // newstat // 1210 | |
739 | data8 0 // newlstat | |
740 | data8 0 // newfstat | |
741 | data8 0 // clone2 | |
742 | data8 0 // getdents64 | |
743 | data8 0 // getunwind // 1215 | |
744 | data8 0 // readahead | |
745 | data8 0 // setxattr | |
746 | data8 0 // lsetxattr | |
747 | data8 0 // fsetxattr | |
748 | data8 0 // getxattr // 1220 | |
749 | data8 0 // lgetxattr | |
750 | data8 0 // fgetxattr | |
751 | data8 0 // listxattr | |
752 | data8 0 // llistxattr | |
753 | data8 0 // flistxattr // 1225 | |
754 | data8 0 // removexattr | |
755 | data8 0 // lremovexattr | |
756 | data8 0 // fremovexattr | |
757 | data8 0 // tkill | |
758 | data8 0 // futex // 1230 | |
759 | data8 0 // sched_setaffinity | |
760 | data8 0 // sched_getaffinity | |
761 | data8 fsys_set_tid_address // set_tid_address | |
762 | data8 0 // fadvise64_64 | |
763 | data8 0 // tgkill // 1235 | |
764 | data8 0 // exit_group | |
765 | data8 0 // lookup_dcookie | |
766 | data8 0 // io_setup | |
767 | data8 0 // io_destroy | |
768 | data8 0 // io_getevents // 1240 | |
769 | data8 0 // io_submit | |
770 | data8 0 // io_cancel | |
771 | data8 0 // epoll_create | |
772 | data8 0 // epoll_ctl | |
773 | data8 0 // epoll_wait // 1245 | |
774 | data8 0 // restart_syscall | |
775 | data8 0 // semtimedop | |
776 | data8 0 // timer_create | |
777 | data8 0 // timer_settime | |
778 | data8 0 // timer_gettime // 1250 | |
779 | data8 0 // timer_getoverrun | |
780 | data8 0 // timer_delete | |
781 | data8 0 // clock_settime | |
782 | data8 fsys_clock_gettime // clock_gettime | |
3bc207d2 FY |
783 | data8 0 // clock_getres // 1255 |
784 | data8 0 // clock_nanosleep | |
785 | data8 0 // fstatfs64 | |
786 | data8 0 // statfs64 | |
787 | data8 0 // mbind | |
788 | data8 0 // get_mempolicy // 1260 | |
789 | data8 0 // set_mempolicy | |
790 | data8 0 // mq_open | |
791 | data8 0 // mq_unlink | |
792 | data8 0 // mq_timedsend | |
793 | data8 0 // mq_timedreceive // 1265 | |
794 | data8 0 // mq_notify | |
795 | data8 0 // mq_getsetattr | |
796 | data8 0 // kexec_load | |
797 | data8 0 // vserver | |
798 | data8 0 // waitid // 1270 | |
799 | data8 0 // add_key | |
800 | data8 0 // request_key | |
801 | data8 0 // keyctl | |
802 | data8 0 // ioprio_set | |
803 | data8 0 // ioprio_get // 1275 | |
804 | data8 0 // move_pages | |
805 | data8 0 // inotify_init | |
806 | data8 0 // inotify_add_watch | |
807 | data8 0 // inotify_rm_watch | |
808 | data8 0 // migrate_pages // 1280 | |
809 | data8 0 // openat | |
810 | data8 0 // mkdirat | |
811 | data8 0 // mknodat | |
812 | data8 0 // fchownat | |
813 | data8 0 // futimesat // 1285 | |
814 | data8 0 // newfstatat | |
815 | data8 0 // unlinkat | |
816 | data8 0 // renameat | |
817 | data8 0 // linkat | |
818 | data8 0 // symlinkat // 1290 | |
819 | data8 0 // readlinkat | |
820 | data8 0 // fchmodat | |
821 | data8 0 // faccessat | |
822 | data8 0 | |
823 | data8 0 // 1295 | |
824 | data8 0 // unshare | |
825 | data8 0 // splice | |
826 | data8 0 // set_robust_list | |
827 | data8 0 // get_robust_list | |
828 | data8 0 // sync_file_range // 1300 | |
829 | data8 0 // tee | |
830 | data8 0 // vmsplice | |
831 | data8 0 | |
832 | data8 fsys_getcpu // getcpu // 1304 | |
9ed2ad86 | 833 | |
c8c1635f KC |
834 | // fill in zeros for the remaining entries |
835 | .zero: | |
e55645ec | 836 | .space fsyscall_table + 8*NR_syscalls - .zero, 0 |