Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/arch/arm/kernel/entry-common.S | |
3 | * | |
4 | * Copyright (C) 2000 Russell King | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | */ | |
1da177e4 | 10 | |
1da177e4 | 11 | #include <asm/unistd.h> |
395a59d0 | 12 | #include <asm/ftrace.h> |
a09e64fb | 13 | #include <mach/entry-macro.S> |
c4c5716e | 14 | #include <asm/unwind.h> |
1da177e4 LT |
15 | |
16 | #include "entry-header.S" | |
17 | ||
1da177e4 LT |
18 | |
19 | .align 5 | |
20 | /* | |
21 | * This is the fast syscall return path. We do as little as | |
22 | * possible here, and this includes saving r0 back into the SVC | |
23 | * stack. | |
24 | */ | |
25 | ret_fast_syscall: | |
c4c5716e CM |
26 | UNWIND(.fnstart ) |
27 | UNWIND(.cantunwind ) | |
1ec42c0c | 28 | disable_irq @ disable interrupts |
1da177e4 LT |
29 | ldr r1, [tsk, #TI_FLAGS] |
30 | tst r1, #_TIF_WORK_MASK | |
31 | bne fast_work_pending | |
f4dc9a4c | 32 | |
f80dff9d DW |
33 | /* perform architecture specific actions before user return */ |
34 | arch_ret_to_user r1, lr | |
35 | ||
b86040a5 | 36 | restore_user_regs fast = 1, offset = S_OFF |
c4c5716e | 37 | UNWIND(.fnend ) |
1da177e4 LT |
38 | |
39 | /* | |
40 | * Ok, we need to do extra processing, enter the slow path. | |
41 | */ | |
42 | fast_work_pending: | |
43 | str r0, [sp, #S_R0+S_OFF]! @ returned r0 | |
44 | work_pending: | |
45 | tst r1, #_TIF_NEED_RESCHED | |
46 | bne work_resched | |
d0420c83 | 47 | tst r1, #_TIF_SIGPENDING|_TIF_NOTIFY_RESUME |
1da177e4 LT |
48 | beq no_work_pending |
49 | mov r0, sp @ 'regs' | |
50 | mov r2, why @ 'syscall' | |
51 | bl do_notify_resume | |
a6c61e9d | 52 | b ret_slow_syscall @ Check work again |
1da177e4 LT |
53 | |
54 | work_resched: | |
55 | bl schedule | |
56 | /* | |
57 | * "slow" syscall return path. "why" tells us if this was a real syscall. | |
58 | */ | |
59 | ENTRY(ret_to_user) | |
60 | ret_slow_syscall: | |
1ec42c0c | 61 | disable_irq @ disable interrupts |
1da177e4 LT |
62 | ldr r1, [tsk, #TI_FLAGS] |
63 | tst r1, #_TIF_WORK_MASK | |
64 | bne work_pending | |
65 | no_work_pending: | |
f80dff9d DW |
66 | /* perform architecture specific actions before user return */ |
67 | arch_ret_to_user r1, lr | |
68 | ||
b86040a5 | 69 | restore_user_regs fast = 0, offset = 0 |
93ed3970 | 70 | ENDPROC(ret_to_user) |
1da177e4 LT |
71 | |
72 | /* | |
73 | * This is how we return from a fork. | |
74 | */ | |
75 | ENTRY(ret_from_fork) | |
76 | bl schedule_tail | |
77 | get_thread_info tsk | |
78 | ldr r1, [tsk, #TI_FLAGS] @ check for syscall tracing | |
79 | mov why, #1 | |
80 | tst r1, #_TIF_SYSCALL_TRACE @ are we tracing syscalls? | |
81 | beq ret_slow_syscall | |
82 | mov r1, sp | |
83 | mov r0, #1 @ trace exit [IP = 1] | |
84 | bl syscall_trace | |
85 | b ret_slow_syscall | |
93ed3970 | 86 | ENDPROC(ret_from_fork) |
1da177e4 | 87 | |
fa1b4f91 AV |
88 | .equ NR_syscalls,0 |
89 | #define CALL(x) .equ NR_syscalls,NR_syscalls+1 | |
1da177e4 | 90 | #include "calls.S" |
fa1b4f91 AV |
91 | #undef CALL |
92 | #define CALL(x) .long x | |
1da177e4 | 93 | |
606576ce | 94 | #ifdef CONFIG_FUNCTION_TRACER |
014c257c AS |
95 | #ifdef CONFIG_DYNAMIC_FTRACE |
96 | ENTRY(mcount) | |
97 | stmdb sp!, {r0-r3, lr} | |
98 | mov r0, lr | |
395a59d0 | 99 | sub r0, r0, #MCOUNT_INSN_SIZE |
014c257c AS |
100 | |
101 | .globl mcount_call | |
102 | mcount_call: | |
103 | bl ftrace_stub | |
d4cc510c | 104 | ldr lr, [fp, #-4] @ restore lr |
014c257c AS |
105 | ldmia sp!, {r0-r3, pc} |
106 | ||
107 | ENTRY(ftrace_caller) | |
108 | stmdb sp!, {r0-r3, lr} | |
109 | ldr r1, [fp, #-4] | |
110 | mov r0, lr | |
395a59d0 | 111 | sub r0, r0, #MCOUNT_INSN_SIZE |
014c257c AS |
112 | |
113 | .globl ftrace_call | |
114 | ftrace_call: | |
115 | bl ftrace_stub | |
d4cc510c | 116 | ldr lr, [fp, #-4] @ restore lr |
014c257c AS |
117 | ldmia sp!, {r0-r3, pc} |
118 | ||
119 | #else | |
120 | ||
181f817e UKK |
121 | ENTRY(__gnu_mcount_nc) |
122 | stmdb sp!, {r0-r3, lr} | |
123 | ldr r0, =ftrace_trace_function | |
124 | ldr r2, [r0] | |
125 | adr r0, ftrace_stub | |
126 | cmp r0, r2 | |
127 | bne gnu_trace | |
128 | ldmia sp!, {r0-r3, ip, lr} | |
6176d394 | 129 | mov pc, ip |
181f817e UKK |
130 | |
131 | gnu_trace: | |
132 | ldr r1, [sp, #20] @ lr of instrumented routine | |
133 | mov r0, lr | |
134 | sub r0, r0, #MCOUNT_INSN_SIZE | |
135 | mov lr, pc | |
136 | mov pc, r2 | |
137 | ldmia sp!, {r0-r3, ip, lr} | |
6176d394 | 138 | mov pc, ip |
181f817e | 139 | |
014c257c AS |
140 | ENTRY(mcount) |
141 | stmdb sp!, {r0-r3, lr} | |
142 | ldr r0, =ftrace_trace_function | |
143 | ldr r2, [r0] | |
144 | adr r0, ftrace_stub | |
145 | cmp r0, r2 | |
146 | bne trace | |
d4cc510c | 147 | ldr lr, [fp, #-4] @ restore lr |
014c257c AS |
148 | ldmia sp!, {r0-r3, pc} |
149 | ||
150 | trace: | |
b3c960b2 | 151 | ldr r1, [fp, #-4] @ lr of instrumented routine |
014c257c | 152 | mov r0, lr |
395a59d0 | 153 | sub r0, r0, #MCOUNT_INSN_SIZE |
014c257c AS |
154 | mov lr, pc |
155 | mov pc, r2 | |
3ef7143d | 156 | ldr lr, [fp, #-4] @ restore lr |
014c257c AS |
157 | ldmia sp!, {r0-r3, pc} |
158 | ||
159 | #endif /* CONFIG_DYNAMIC_FTRACE */ | |
160 | ||
161 | .globl ftrace_stub | |
162 | ftrace_stub: | |
163 | mov pc, lr | |
164 | ||
606576ce | 165 | #endif /* CONFIG_FUNCTION_TRACER */ |
014c257c | 166 | |
1da177e4 LT |
167 | /*============================================================================= |
168 | * SWI handler | |
169 | *----------------------------------------------------------------------------- | |
170 | */ | |
171 | ||
172 | /* If we're optimising for StrongARM the resulting code won't | |
173 | run on an ARM7 and we can save a couple of instructions. | |
174 | --pb */ | |
175 | #ifdef CONFIG_CPU_ARM710 | |
3f2829a3 NP |
176 | #define A710(code...) code |
177 | .Larm710bug: | |
1da177e4 LT |
178 | ldmia sp, {r0 - lr}^ @ Get calling r0 - lr |
179 | mov r0, r0 | |
1da177e4 | 180 | add sp, sp, #S_FRAME_SIZE |
60ac133a | 181 | subs pc, lr, #4 |
1da177e4 | 182 | #else |
3f2829a3 | 183 | #define A710(code...) |
1da177e4 LT |
184 | #endif |
185 | ||
186 | .align 5 | |
187 | ENTRY(vector_swi) | |
f4dc9a4c RK |
188 | sub sp, sp, #S_FRAME_SIZE |
189 | stmia sp, {r0 - r12} @ Calling r0 - r12 | |
b86040a5 CM |
190 | ARM( add r8, sp, #S_PC ) |
191 | ARM( stmdb r8, {sp, lr}^ ) @ Calling sp, lr | |
192 | THUMB( mov r8, sp ) | |
193 | THUMB( store_user_sp_lr r8, r10, S_SP ) @ calling sp, lr | |
f4dc9a4c RK |
194 | mrs r8, spsr @ called from non-FIQ mode, so ok. |
195 | str lr, [sp, #S_PC] @ Save calling PC | |
196 | str r8, [sp, #S_PSR] @ Save CPSR | |
197 | str r0, [sp, #S_OLD_R0] @ Save OLD_R0 | |
1da177e4 | 198 | zero_fp |
e0f9f4a6 RK |
199 | |
200 | /* | |
201 | * Get the system call number. | |
202 | */ | |
3f2829a3 | 203 | |
dd35afc2 | 204 | #if defined(CONFIG_OABI_COMPAT) |
3f2829a3 | 205 | |
dd35afc2 NP |
206 | /* |
207 | * If we have CONFIG_OABI_COMPAT then we need to look at the swi | |
208 | * value to determine if it is an EABI or an old ABI call. | |
209 | */ | |
210 | #ifdef CONFIG_ARM_THUMB | |
211 | tst r8, #PSR_T_BIT | |
212 | movne r10, #0 @ no thumb OABI emulation | |
213 | ldreq r10, [lr, #-4] @ get SWI instruction | |
214 | #else | |
215 | ldr r10, [lr, #-4] @ get SWI instruction | |
216 | A710( and ip, r10, #0x0f000000 @ check for SWI ) | |
217 | A710( teq ip, #0x0f000000 ) | |
218 | A710( bne .Larm710bug ) | |
219 | #endif | |
26584853 CM |
220 | #ifdef CONFIG_CPU_ENDIAN_BE8 |
221 | rev r10, r10 @ little endian instruction | |
222 | #endif | |
dd35afc2 NP |
223 | |
224 | #elif defined(CONFIG_AEABI) | |
225 | ||
226 | /* | |
227 | * Pure EABI user space always put syscall number into scno (r7). | |
228 | */ | |
3f2829a3 NP |
229 | A710( ldr ip, [lr, #-4] @ get SWI instruction ) |
230 | A710( and ip, ip, #0x0f000000 @ check for SWI ) | |
231 | A710( teq ip, #0x0f000000 ) | |
232 | A710( bne .Larm710bug ) | |
dd35afc2 | 233 | |
3f2829a3 | 234 | #elif defined(CONFIG_ARM_THUMB) |
dd35afc2 NP |
235 | |
236 | /* Legacy ABI only, possibly thumb mode. */ | |
e0f9f4a6 RK |
237 | tst r8, #PSR_T_BIT @ this is SPSR from save_user_regs |
238 | addne scno, r7, #__NR_SYSCALL_BASE @ put OS number in | |
239 | ldreq scno, [lr, #-4] | |
dd35afc2 | 240 | |
e0f9f4a6 | 241 | #else |
dd35afc2 NP |
242 | |
243 | /* Legacy ABI only. */ | |
e0f9f4a6 | 244 | ldr scno, [lr, #-4] @ get SWI instruction |
3f2829a3 NP |
245 | A710( and ip, scno, #0x0f000000 @ check for SWI ) |
246 | A710( teq ip, #0x0f000000 ) | |
247 | A710( bne .Larm710bug ) | |
dd35afc2 | 248 | |
e0f9f4a6 | 249 | #endif |
1da177e4 LT |
250 | |
251 | #ifdef CONFIG_ALIGNMENT_TRAP | |
252 | ldr ip, __cr_alignment | |
253 | ldr ip, [ip] | |
254 | mcr p15, 0, ip, c1, c0 @ update control register | |
255 | #endif | |
1ec42c0c | 256 | enable_irq |
1da177e4 | 257 | |
1da177e4 | 258 | get_thread_info tsk |
dd35afc2 | 259 | adr tbl, sys_call_table @ load syscall table pointer |
1da177e4 | 260 | ldr ip, [tsk, #TI_FLAGS] @ check for syscall tracing |
dd35afc2 NP |
261 | |
262 | #if defined(CONFIG_OABI_COMPAT) | |
263 | /* | |
264 | * If the swi argument is zero, this is an EABI call and we do nothing. | |
265 | * | |
266 | * If this is an old ABI call, get the syscall number into scno and | |
267 | * get the old ABI syscall table address. | |
268 | */ | |
269 | bics r10, r10, #0xff000000 | |
270 | eorne scno, r10, #__NR_OABI_SYSCALL_BASE | |
271 | ldrne tbl, =sys_oabi_call_table | |
272 | #elif !defined(CONFIG_AEABI) | |
1da177e4 | 273 | bic scno, scno, #0xff000000 @ mask off SWI op-code |
e0f9f4a6 | 274 | eor scno, scno, #__NR_SYSCALL_BASE @ check OS number |
3f2829a3 | 275 | #endif |
dd35afc2 | 276 | |
3f2829a3 | 277 | stmdb sp!, {r4, r5} @ push fifth and sixth args |
1da177e4 LT |
278 | tst ip, #_TIF_SYSCALL_TRACE @ are we tracing syscalls? |
279 | bne __sys_trace | |
280 | ||
1da177e4 | 281 | cmp scno, #NR_syscalls @ check upper syscall limit |
b86040a5 | 282 | adr lr, BSYM(ret_fast_syscall) @ return address |
1da177e4 LT |
283 | ldrcc pc, [tbl, scno, lsl #2] @ call sys_* routine |
284 | ||
285 | add r1, sp, #S_OFF | |
286 | 2: mov why, #0 @ no longer a real syscall | |
e0f9f4a6 RK |
287 | cmp scno, #(__ARM_NR_BASE - __NR_SYSCALL_BASE) |
288 | eor r0, scno, #__NR_SYSCALL_BASE @ put OS number back | |
1da177e4 LT |
289 | bcs arm_syscall |
290 | b sys_ni_syscall @ not private func | |
93ed3970 | 291 | ENDPROC(vector_swi) |
1da177e4 LT |
292 | |
293 | /* | |
294 | * This is the really slow path. We're going to be doing | |
295 | * context switches, and waiting for our parent to respond. | |
296 | */ | |
297 | __sys_trace: | |
3f471126 | 298 | mov r2, scno |
1da177e4 LT |
299 | add r1, sp, #S_OFF |
300 | mov r0, #0 @ trace entry [IP = 0] | |
301 | bl syscall_trace | |
302 | ||
b86040a5 | 303 | adr lr, BSYM(__sys_trace_return) @ return address |
3f471126 | 304 | mov scno, r0 @ syscall number (possibly new) |
1da177e4 LT |
305 | add r1, sp, #S_R0 + S_OFF @ pointer to regs |
306 | cmp scno, #NR_syscalls @ check upper syscall limit | |
307 | ldmccia r1, {r0 - r3} @ have to reload r0 - r3 | |
308 | ldrcc pc, [tbl, scno, lsl #2] @ call sys_* routine | |
309 | b 2b | |
310 | ||
311 | __sys_trace_return: | |
312 | str r0, [sp, #S_R0 + S_OFF]! @ save returned r0 | |
3f471126 | 313 | mov r2, scno |
1da177e4 LT |
314 | mov r1, sp |
315 | mov r0, #1 @ trace exit [IP = 1] | |
316 | bl syscall_trace | |
317 | b ret_slow_syscall | |
318 | ||
319 | .align 5 | |
320 | #ifdef CONFIG_ALIGNMENT_TRAP | |
321 | .type __cr_alignment, #object | |
322 | __cr_alignment: | |
323 | .word cr_alignment | |
dd35afc2 NP |
324 | #endif |
325 | .ltorg | |
326 | ||
327 | /* | |
328 | * This is the syscall table declaration for native ABI syscalls. | |
329 | * With EABI a couple syscalls are obsolete and defined as sys_ni_syscall. | |
330 | */ | |
331 | #define ABI(native, compat) native | |
332 | #ifdef CONFIG_AEABI | |
333 | #define OBSOLETE(syscall) sys_ni_syscall | |
334 | #else | |
335 | #define OBSOLETE(syscall) syscall | |
1da177e4 LT |
336 | #endif |
337 | ||
338 | .type sys_call_table, #object | |
339 | ENTRY(sys_call_table) | |
340 | #include "calls.S" | |
dd35afc2 NP |
341 | #undef ABI |
342 | #undef OBSOLETE | |
1da177e4 LT |
343 | |
344 | /*============================================================================ | |
345 | * Special system call wrappers | |
346 | */ | |
347 | @ r0 = syscall number | |
567bd980 | 348 | @ r8 = syscall table |
1da177e4 | 349 | sys_syscall: |
5247593c | 350 | bic scno, r0, #__NR_OABI_SYSCALL_BASE |
1da177e4 LT |
351 | cmp scno, #__NR_syscall - __NR_SYSCALL_BASE |
352 | cmpne scno, #NR_syscalls @ check range | |
353 | stmloia sp, {r5, r6} @ shuffle args | |
354 | movlo r0, r1 | |
355 | movlo r1, r2 | |
356 | movlo r2, r3 | |
357 | movlo r3, r4 | |
358 | ldrlo pc, [tbl, scno, lsl #2] | |
359 | b sys_ni_syscall | |
93ed3970 | 360 | ENDPROC(sys_syscall) |
1da177e4 LT |
361 | |
362 | sys_fork_wrapper: | |
363 | add r0, sp, #S_OFF | |
364 | b sys_fork | |
93ed3970 | 365 | ENDPROC(sys_fork_wrapper) |
1da177e4 LT |
366 | |
367 | sys_vfork_wrapper: | |
368 | add r0, sp, #S_OFF | |
369 | b sys_vfork | |
93ed3970 | 370 | ENDPROC(sys_vfork_wrapper) |
1da177e4 LT |
371 | |
372 | sys_execve_wrapper: | |
373 | add r3, sp, #S_OFF | |
374 | b sys_execve | |
93ed3970 | 375 | ENDPROC(sys_execve_wrapper) |
1da177e4 LT |
376 | |
377 | sys_clone_wrapper: | |
378 | add ip, sp, #S_OFF | |
379 | str ip, [sp, #4] | |
380 | b sys_clone | |
93ed3970 | 381 | ENDPROC(sys_clone_wrapper) |
1da177e4 | 382 | |
1da177e4 LT |
383 | sys_sigreturn_wrapper: |
384 | add r0, sp, #S_OFF | |
385 | b sys_sigreturn | |
93ed3970 | 386 | ENDPROC(sys_sigreturn_wrapper) |
1da177e4 LT |
387 | |
388 | sys_rt_sigreturn_wrapper: | |
389 | add r0, sp, #S_OFF | |
390 | b sys_rt_sigreturn | |
93ed3970 | 391 | ENDPROC(sys_rt_sigreturn_wrapper) |
1da177e4 LT |
392 | |
393 | sys_sigaltstack_wrapper: | |
394 | ldr r2, [sp, #S_OFF + S_SP] | |
395 | b do_sigaltstack | |
93ed3970 | 396 | ENDPROC(sys_sigaltstack_wrapper) |
1da177e4 | 397 | |
713c4815 NP |
398 | sys_statfs64_wrapper: |
399 | teq r1, #88 | |
400 | moveq r1, #84 | |
401 | b sys_statfs64 | |
93ed3970 | 402 | ENDPROC(sys_statfs64_wrapper) |
713c4815 NP |
403 | |
404 | sys_fstatfs64_wrapper: | |
405 | teq r1, #88 | |
406 | moveq r1, #84 | |
407 | b sys_fstatfs64 | |
93ed3970 | 408 | ENDPROC(sys_fstatfs64_wrapper) |
713c4815 | 409 | |
1da177e4 LT |
410 | /* |
411 | * Note: off_4k (r5) is always units of 4K. If we can't do the requested | |
412 | * offset, we return EINVAL. | |
413 | */ | |
414 | sys_mmap2: | |
415 | #if PAGE_SHIFT > 12 | |
416 | tst r5, #PGOFF_MASK | |
417 | moveq r5, r5, lsr #PAGE_SHIFT - 12 | |
418 | streq r5, [sp, #4] | |
f8b72560 | 419 | beq sys_mmap_pgoff |
1da177e4 | 420 | mov r0, #-EINVAL |
7999d8d7 | 421 | mov pc, lr |
1da177e4 LT |
422 | #else |
423 | str r5, [sp, #4] | |
f8b72560 | 424 | b sys_mmap_pgoff |
1da177e4 | 425 | #endif |
93ed3970 | 426 | ENDPROC(sys_mmap2) |
687ad019 NP |
427 | |
428 | #ifdef CONFIG_OABI_COMPAT | |
dd35afc2 | 429 | |
687ad019 NP |
430 | /* |
431 | * These are syscalls with argument register differences | |
432 | */ | |
433 | ||
434 | sys_oabi_pread64: | |
435 | stmia sp, {r3, r4} | |
436 | b sys_pread64 | |
93ed3970 | 437 | ENDPROC(sys_oabi_pread64) |
687ad019 NP |
438 | |
439 | sys_oabi_pwrite64: | |
440 | stmia sp, {r3, r4} | |
441 | b sys_pwrite64 | |
93ed3970 | 442 | ENDPROC(sys_oabi_pwrite64) |
687ad019 NP |
443 | |
444 | sys_oabi_truncate64: | |
445 | mov r3, r2 | |
446 | mov r2, r1 | |
447 | b sys_truncate64 | |
93ed3970 | 448 | ENDPROC(sys_oabi_truncate64) |
687ad019 NP |
449 | |
450 | sys_oabi_ftruncate64: | |
451 | mov r3, r2 | |
452 | mov r2, r1 | |
453 | b sys_ftruncate64 | |
93ed3970 | 454 | ENDPROC(sys_oabi_ftruncate64) |
687ad019 NP |
455 | |
456 | sys_oabi_readahead: | |
457 | str r3, [sp] | |
458 | mov r3, r2 | |
459 | mov r2, r1 | |
460 | b sys_readahead | |
93ed3970 | 461 | ENDPROC(sys_oabi_readahead) |
687ad019 | 462 | |
dd35afc2 NP |
463 | /* |
464 | * Let's declare a second syscall table for old ABI binaries | |
465 | * using the compatibility syscall entries. | |
466 | */ | |
467 | #define ABI(native, compat) compat | |
468 | #define OBSOLETE(syscall) syscall | |
469 | ||
470 | .type sys_oabi_call_table, #object | |
471 | ENTRY(sys_oabi_call_table) | |
472 | #include "calls.S" | |
473 | #undef ABI | |
474 | #undef OBSOLETE | |
475 | ||
687ad019 NP |
476 | #endif |
477 |