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 | |
d13e5edd TAP |
32 | #if defined(CONFIG_IRQSOFF_TRACER) |
33 | asm_trace_hardirqs_on | |
34 | #endif | |
f4dc9a4c | 35 | |
f80dff9d DW |
36 | /* perform architecture specific actions before user return */ |
37 | arch_ret_to_user r1, lr | |
38 | ||
b86040a5 | 39 | restore_user_regs fast = 1, offset = S_OFF |
c4c5716e | 40 | UNWIND(.fnend ) |
1da177e4 LT |
41 | |
42 | /* | |
43 | * Ok, we need to do extra processing, enter the slow path. | |
44 | */ | |
45 | fast_work_pending: | |
46 | str r0, [sp, #S_R0+S_OFF]! @ returned r0 | |
47 | work_pending: | |
48 | tst r1, #_TIF_NEED_RESCHED | |
49 | bne work_resched | |
d0420c83 | 50 | tst r1, #_TIF_SIGPENDING|_TIF_NOTIFY_RESUME |
1da177e4 LT |
51 | beq no_work_pending |
52 | mov r0, sp @ 'regs' | |
53 | mov r2, why @ 'syscall' | |
b2b163bb RK |
54 | tst r1, #_TIF_SIGPENDING @ delivering a signal? |
55 | movne why, #0 @ prevent further restarts | |
1da177e4 | 56 | bl do_notify_resume |
a6c61e9d | 57 | b ret_slow_syscall @ Check work again |
1da177e4 LT |
58 | |
59 | work_resched: | |
60 | bl schedule | |
61 | /* | |
62 | * "slow" syscall return path. "why" tells us if this was a real syscall. | |
63 | */ | |
64 | ENTRY(ret_to_user) | |
65 | ret_slow_syscall: | |
1ec42c0c | 66 | disable_irq @ disable interrupts |
1da177e4 LT |
67 | ldr r1, [tsk, #TI_FLAGS] |
68 | tst r1, #_TIF_WORK_MASK | |
69 | bne work_pending | |
70 | no_work_pending: | |
d13e5edd TAP |
71 | #if defined(CONFIG_IRQSOFF_TRACER) |
72 | asm_trace_hardirqs_on | |
73 | #endif | |
f80dff9d DW |
74 | /* perform architecture specific actions before user return */ |
75 | arch_ret_to_user r1, lr | |
76 | ||
b86040a5 | 77 | restore_user_regs fast = 0, offset = 0 |
93ed3970 | 78 | ENDPROC(ret_to_user) |
1da177e4 LT |
79 | |
80 | /* | |
81 | * This is how we return from a fork. | |
82 | */ | |
83 | ENTRY(ret_from_fork) | |
84 | bl schedule_tail | |
85 | get_thread_info tsk | |
86 | ldr r1, [tsk, #TI_FLAGS] @ check for syscall tracing | |
87 | mov why, #1 | |
88 | tst r1, #_TIF_SYSCALL_TRACE @ are we tracing syscalls? | |
89 | beq ret_slow_syscall | |
90 | mov r1, sp | |
91 | mov r0, #1 @ trace exit [IP = 1] | |
92 | bl syscall_trace | |
93 | b ret_slow_syscall | |
93ed3970 | 94 | ENDPROC(ret_from_fork) |
1da177e4 | 95 | |
fa1b4f91 AV |
96 | .equ NR_syscalls,0 |
97 | #define CALL(x) .equ NR_syscalls,NR_syscalls+1 | |
1da177e4 | 98 | #include "calls.S" |
fa1b4f91 AV |
99 | #undef CALL |
100 | #define CALL(x) .long x | |
1da177e4 | 101 | |
606576ce | 102 | #ifdef CONFIG_FUNCTION_TRACER |
686ff228 RV |
103 | /* |
104 | * When compiling with -pg, gcc inserts a call to the mcount routine at the | |
105 | * start of every function. In mcount, apart from the function's address (in | |
106 | * lr), we need to get hold of the function's caller's address. | |
107 | * | |
108 | * Older GCCs (pre-4.4) inserted a call to a routine called mcount like this: | |
109 | * | |
110 | * bl mcount | |
111 | * | |
112 | * These versions have the limitation that in order for the mcount routine to | |
113 | * be able to determine the function's caller's address, an APCS-style frame | |
114 | * pointer (which is set up with something like the code below) is required. | |
115 | * | |
116 | * mov ip, sp | |
117 | * push {fp, ip, lr, pc} | |
118 | * sub fp, ip, #4 | |
119 | * | |
120 | * With EABI, these frame pointers are not available unless -mapcs-frame is | |
121 | * specified, and if building as Thumb-2, not even then. | |
122 | * | |
123 | * Newer GCCs (4.4+) solve this problem by introducing a new version of mcount, | |
124 | * with call sites like: | |
125 | * | |
126 | * push {lr} | |
127 | * bl __gnu_mcount_nc | |
128 | * | |
129 | * With these compilers, frame pointers are not necessary. | |
130 | * | |
131 | * mcount can be thought of as a function called in the middle of a subroutine | |
132 | * call. As such, it needs to be transparent for both the caller and the | |
133 | * callee: the original lr needs to be restored when leaving mcount, and no | |
134 | * registers should be clobbered. (In the __gnu_mcount_nc implementation, we | |
135 | * clobber the ip register. This is OK because the ARM calling convention | |
136 | * allows it to be clobbered in subroutines and doesn't use it to hold | |
137 | * parameters.) | |
3b6c223b RV |
138 | * |
139 | * When using dynamic ftrace, we patch out the mcount call by a "mov r0, r0" | |
140 | * for the mcount case, and a "pop {lr}" for the __gnu_mcount_nc case (see | |
141 | * arch/arm/kernel/ftrace.c). | |
686ff228 | 142 | */ |
09bfafac RV |
143 | |
144 | #ifndef CONFIG_OLD_MCOUNT | |
145 | #if (__GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 4)) | |
146 | #error Ftrace requires CONFIG_FRAME_POINTER=y with GCC older than 4.4.0. | |
147 | #endif | |
148 | #endif | |
149 | ||
d3b9dc9d RV |
150 | .macro __mcount suffix |
151 | mcount_enter | |
152 | ldr r0, =ftrace_trace_function | |
153 | ldr r2, [r0] | |
154 | adr r0, .Lftrace_stub | |
155 | cmp r0, r2 | |
156 | bne 1f | |
3b6c223b | 157 | |
376cfa87 TB |
158 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
159 | ldr r1, =ftrace_graph_return | |
160 | ldr r2, [r1] | |
161 | cmp r0, r2 | |
162 | bne ftrace_graph_caller\suffix | |
163 | ||
164 | ldr r1, =ftrace_graph_entry | |
165 | ldr r2, [r1] | |
166 | ldr r0, =ftrace_graph_entry_stub | |
167 | cmp r0, r2 | |
168 | bne ftrace_graph_caller\suffix | |
169 | #endif | |
170 | ||
d3b9dc9d | 171 | mcount_exit |
3b6c223b | 172 | |
d3b9dc9d RV |
173 | 1: mcount_get_lr r1 @ lr of instrumented func |
174 | mov r0, lr @ instrumented function | |
28e192d6 | 175 | sub r0, r0, #MCOUNT_INSN_SIZE |
d3b9dc9d RV |
176 | adr lr, BSYM(2f) |
177 | mov pc, r2 | |
178 | 2: mcount_exit | |
179 | .endm | |
014c257c | 180 | |
d3b9dc9d RV |
181 | .macro __ftrace_caller suffix |
182 | mcount_enter | |
014c257c | 183 | |
d3b9dc9d RV |
184 | mcount_get_lr r1 @ lr of instrumented func |
185 | mov r0, lr @ instrumented function | |
186 | sub r0, r0, #MCOUNT_INSN_SIZE | |
187 | ||
188 | .globl ftrace_call\suffix | |
189 | ftrace_call\suffix: | |
28e192d6 | 190 | bl ftrace_stub |
d3b9dc9d | 191 | |
dd686eb1 RV |
192 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
193 | .globl ftrace_graph_call\suffix | |
194 | ftrace_graph_call\suffix: | |
195 | mov r0, r0 | |
196 | #endif | |
197 | ||
d3b9dc9d RV |
198 | mcount_exit |
199 | .endm | |
014c257c | 200 | |
376cfa87 TB |
201 | .macro __ftrace_graph_caller |
202 | sub r0, fp, #4 @ &lr of instrumented routine (&parent) | |
dd686eb1 RV |
203 | #ifdef CONFIG_DYNAMIC_FTRACE |
204 | @ called from __ftrace_caller, saved in mcount_enter | |
205 | ldr r1, [sp, #16] @ instrumented routine (func) | |
206 | #else | |
207 | @ called from __mcount, untouched in lr | |
376cfa87 | 208 | mov r1, lr @ instrumented routine (func) |
dd686eb1 | 209 | #endif |
376cfa87 TB |
210 | sub r1, r1, #MCOUNT_INSN_SIZE |
211 | mov r2, fp @ frame pointer | |
212 | bl prepare_ftrace_return | |
213 | mcount_exit | |
214 | .endm | |
014c257c | 215 | |
3b6c223b | 216 | #ifdef CONFIG_OLD_MCOUNT |
d3b9dc9d RV |
217 | /* |
218 | * mcount | |
219 | */ | |
220 | ||
221 | .macro mcount_enter | |
222 | stmdb sp!, {r0-r3, lr} | |
223 | .endm | |
224 | ||
225 | .macro mcount_get_lr reg | |
226 | ldr \reg, [fp, #-4] | |
227 | .endm | |
228 | ||
229 | .macro mcount_exit | |
230 | ldr lr, [fp, #-4] | |
231 | ldmia sp!, {r0-r3, pc} | |
232 | .endm | |
233 | ||
3b6c223b | 234 | ENTRY(mcount) |
d3b9dc9d | 235 | #ifdef CONFIG_DYNAMIC_FTRACE |
3b6c223b RV |
236 | stmdb sp!, {lr} |
237 | ldr lr, [fp, #-4] | |
238 | ldmia sp!, {pc} | |
d3b9dc9d RV |
239 | #else |
240 | __mcount _old | |
241 | #endif | |
72fa62fa | 242 | ENDPROC(mcount) |
014c257c | 243 | |
d3b9dc9d | 244 | #ifdef CONFIG_DYNAMIC_FTRACE |
3b6c223b | 245 | ENTRY(ftrace_caller_old) |
d3b9dc9d | 246 | __ftrace_caller _old |
3b6c223b RV |
247 | ENDPROC(ftrace_caller_old) |
248 | #endif | |
014c257c | 249 | |
376cfa87 TB |
250 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
251 | ENTRY(ftrace_graph_caller_old) | |
252 | __ftrace_graph_caller | |
253 | ENDPROC(ftrace_graph_caller_old) | |
254 | #endif | |
014c257c | 255 | |
d3b9dc9d RV |
256 | .purgem mcount_enter |
257 | .purgem mcount_get_lr | |
258 | .purgem mcount_exit | |
259 | #endif | |
014c257c | 260 | |
d3b9dc9d RV |
261 | /* |
262 | * __gnu_mcount_nc | |
263 | */ | |
264 | ||
265 | .macro mcount_enter | |
28e192d6 | 266 | stmdb sp!, {r0-r3, lr} |
d3b9dc9d RV |
267 | .endm |
268 | ||
269 | .macro mcount_get_lr reg | |
270 | ldr \reg, [sp, #20] | |
271 | .endm | |
272 | ||
273 | .macro mcount_exit | |
28e192d6 RV |
274 | ldmia sp!, {r0-r3, ip, lr} |
275 | mov pc, ip | |
d3b9dc9d | 276 | .endm |
181f817e | 277 | |
d3b9dc9d RV |
278 | ENTRY(__gnu_mcount_nc) |
279 | #ifdef CONFIG_DYNAMIC_FTRACE | |
280 | mov ip, lr | |
281 | ldmia sp!, {lr} | |
28e192d6 | 282 | mov pc, ip |
d3b9dc9d RV |
283 | #else |
284 | __mcount | |
285 | #endif | |
72fa62fa | 286 | ENDPROC(__gnu_mcount_nc) |
181f817e | 287 | |
d3b9dc9d RV |
288 | #ifdef CONFIG_DYNAMIC_FTRACE |
289 | ENTRY(ftrace_caller) | |
290 | __ftrace_caller | |
291 | ENDPROC(ftrace_caller) | |
09bfafac | 292 | #endif |
014c257c | 293 | |
376cfa87 TB |
294 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
295 | ENTRY(ftrace_graph_caller) | |
296 | __ftrace_graph_caller | |
297 | ENDPROC(ftrace_graph_caller) | |
09bfafac | 298 | #endif |
014c257c | 299 | |
d3b9dc9d RV |
300 | .purgem mcount_enter |
301 | .purgem mcount_get_lr | |
302 | .purgem mcount_exit | |
014c257c | 303 | |
376cfa87 TB |
304 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
305 | .globl return_to_handler | |
306 | return_to_handler: | |
307 | stmdb sp!, {r0-r3} | |
308 | mov r0, fp @ frame pointer | |
309 | bl ftrace_return_to_handler | |
310 | mov lr, r0 @ r0 has real ret addr | |
311 | ldmia sp!, {r0-r3} | |
312 | mov pc, lr | |
313 | #endif | |
014c257c | 314 | |
72fa62fa | 315 | ENTRY(ftrace_stub) |
a3ba87a6 | 316 | .Lftrace_stub: |
28e192d6 | 317 | mov pc, lr |
72fa62fa | 318 | ENDPROC(ftrace_stub) |
014c257c | 319 | |
606576ce | 320 | #endif /* CONFIG_FUNCTION_TRACER */ |
014c257c | 321 | |
1da177e4 LT |
322 | /*============================================================================= |
323 | * SWI handler | |
324 | *----------------------------------------------------------------------------- | |
325 | */ | |
326 | ||
327 | /* If we're optimising for StrongARM the resulting code won't | |
328 | run on an ARM7 and we can save a couple of instructions. | |
329 | --pb */ | |
330 | #ifdef CONFIG_CPU_ARM710 | |
3f2829a3 NP |
331 | #define A710(code...) code |
332 | .Larm710bug: | |
1da177e4 LT |
333 | ldmia sp, {r0 - lr}^ @ Get calling r0 - lr |
334 | mov r0, r0 | |
1da177e4 | 335 | add sp, sp, #S_FRAME_SIZE |
60ac133a | 336 | subs pc, lr, #4 |
1da177e4 | 337 | #else |
3f2829a3 | 338 | #define A710(code...) |
1da177e4 LT |
339 | #endif |
340 | ||
341 | .align 5 | |
342 | ENTRY(vector_swi) | |
f4dc9a4c RK |
343 | sub sp, sp, #S_FRAME_SIZE |
344 | stmia sp, {r0 - r12} @ Calling r0 - r12 | |
b86040a5 CM |
345 | ARM( add r8, sp, #S_PC ) |
346 | ARM( stmdb r8, {sp, lr}^ ) @ Calling sp, lr | |
347 | THUMB( mov r8, sp ) | |
348 | THUMB( store_user_sp_lr r8, r10, S_SP ) @ calling sp, lr | |
f4dc9a4c RK |
349 | mrs r8, spsr @ called from non-FIQ mode, so ok. |
350 | str lr, [sp, #S_PC] @ Save calling PC | |
351 | str r8, [sp, #S_PSR] @ Save CPSR | |
352 | str r0, [sp, #S_OLD_R0] @ Save OLD_R0 | |
1da177e4 | 353 | zero_fp |
e0f9f4a6 RK |
354 | |
355 | /* | |
356 | * Get the system call number. | |
357 | */ | |
3f2829a3 | 358 | |
dd35afc2 | 359 | #if defined(CONFIG_OABI_COMPAT) |
3f2829a3 | 360 | |
dd35afc2 NP |
361 | /* |
362 | * If we have CONFIG_OABI_COMPAT then we need to look at the swi | |
363 | * value to determine if it is an EABI or an old ABI call. | |
364 | */ | |
365 | #ifdef CONFIG_ARM_THUMB | |
366 | tst r8, #PSR_T_BIT | |
367 | movne r10, #0 @ no thumb OABI emulation | |
368 | ldreq r10, [lr, #-4] @ get SWI instruction | |
369 | #else | |
370 | ldr r10, [lr, #-4] @ get SWI instruction | |
371 | A710( and ip, r10, #0x0f000000 @ check for SWI ) | |
372 | A710( teq ip, #0x0f000000 ) | |
373 | A710( bne .Larm710bug ) | |
374 | #endif | |
26584853 CM |
375 | #ifdef CONFIG_CPU_ENDIAN_BE8 |
376 | rev r10, r10 @ little endian instruction | |
377 | #endif | |
dd35afc2 NP |
378 | |
379 | #elif defined(CONFIG_AEABI) | |
380 | ||
381 | /* | |
382 | * Pure EABI user space always put syscall number into scno (r7). | |
383 | */ | |
3f2829a3 NP |
384 | A710( ldr ip, [lr, #-4] @ get SWI instruction ) |
385 | A710( and ip, ip, #0x0f000000 @ check for SWI ) | |
386 | A710( teq ip, #0x0f000000 ) | |
387 | A710( bne .Larm710bug ) | |
dd35afc2 | 388 | |
3f2829a3 | 389 | #elif defined(CONFIG_ARM_THUMB) |
dd35afc2 NP |
390 | |
391 | /* Legacy ABI only, possibly thumb mode. */ | |
e0f9f4a6 RK |
392 | tst r8, #PSR_T_BIT @ this is SPSR from save_user_regs |
393 | addne scno, r7, #__NR_SYSCALL_BASE @ put OS number in | |
394 | ldreq scno, [lr, #-4] | |
dd35afc2 | 395 | |
e0f9f4a6 | 396 | #else |
dd35afc2 NP |
397 | |
398 | /* Legacy ABI only. */ | |
e0f9f4a6 | 399 | ldr scno, [lr, #-4] @ get SWI instruction |
3f2829a3 NP |
400 | A710( and ip, scno, #0x0f000000 @ check for SWI ) |
401 | A710( teq ip, #0x0f000000 ) | |
402 | A710( bne .Larm710bug ) | |
dd35afc2 | 403 | |
e0f9f4a6 | 404 | #endif |
1da177e4 LT |
405 | |
406 | #ifdef CONFIG_ALIGNMENT_TRAP | |
407 | ldr ip, __cr_alignment | |
408 | ldr ip, [ip] | |
409 | mcr p15, 0, ip, c1, c0 @ update control register | |
410 | #endif | |
1ec42c0c | 411 | enable_irq |
1da177e4 | 412 | |
1da177e4 | 413 | get_thread_info tsk |
dd35afc2 | 414 | adr tbl, sys_call_table @ load syscall table pointer |
dd35afc2 NP |
415 | |
416 | #if defined(CONFIG_OABI_COMPAT) | |
417 | /* | |
418 | * If the swi argument is zero, this is an EABI call and we do nothing. | |
419 | * | |
420 | * If this is an old ABI call, get the syscall number into scno and | |
421 | * get the old ABI syscall table address. | |
422 | */ | |
423 | bics r10, r10, #0xff000000 | |
424 | eorne scno, r10, #__NR_OABI_SYSCALL_BASE | |
425 | ldrne tbl, =sys_oabi_call_table | |
426 | #elif !defined(CONFIG_AEABI) | |
1da177e4 | 427 | bic scno, scno, #0xff000000 @ mask off SWI op-code |
e0f9f4a6 | 428 | eor scno, scno, #__NR_SYSCALL_BASE @ check OS number |
3f2829a3 | 429 | #endif |
dd35afc2 | 430 | |
70c70d97 | 431 | ldr r10, [tsk, #TI_FLAGS] @ check for syscall tracing |
3f2829a3 | 432 | stmdb sp!, {r4, r5} @ push fifth and sixth args |
70c70d97 NP |
433 | |
434 | #ifdef CONFIG_SECCOMP | |
435 | tst r10, #_TIF_SECCOMP | |
436 | beq 1f | |
437 | mov r0, scno | |
438 | bl __secure_computing | |
439 | add r0, sp, #S_R0 + S_OFF @ pointer to regs | |
440 | ldmia r0, {r0 - r3} @ have to reload r0 - r3 | |
441 | 1: | |
442 | #endif | |
443 | ||
444 | tst r10, #_TIF_SYSCALL_TRACE @ are we tracing syscalls? | |
1da177e4 LT |
445 | bne __sys_trace |
446 | ||
1da177e4 | 447 | cmp scno, #NR_syscalls @ check upper syscall limit |
b86040a5 | 448 | adr lr, BSYM(ret_fast_syscall) @ return address |
1da177e4 LT |
449 | ldrcc pc, [tbl, scno, lsl #2] @ call sys_* routine |
450 | ||
451 | add r1, sp, #S_OFF | |
452 | 2: mov why, #0 @ no longer a real syscall | |
e0f9f4a6 RK |
453 | cmp scno, #(__ARM_NR_BASE - __NR_SYSCALL_BASE) |
454 | eor r0, scno, #__NR_SYSCALL_BASE @ put OS number back | |
1da177e4 LT |
455 | bcs arm_syscall |
456 | b sys_ni_syscall @ not private func | |
93ed3970 | 457 | ENDPROC(vector_swi) |
1da177e4 LT |
458 | |
459 | /* | |
460 | * This is the really slow path. We're going to be doing | |
461 | * context switches, and waiting for our parent to respond. | |
462 | */ | |
463 | __sys_trace: | |
3f471126 | 464 | mov r2, scno |
1da177e4 LT |
465 | add r1, sp, #S_OFF |
466 | mov r0, #0 @ trace entry [IP = 0] | |
467 | bl syscall_trace | |
468 | ||
b86040a5 | 469 | adr lr, BSYM(__sys_trace_return) @ return address |
3f471126 | 470 | mov scno, r0 @ syscall number (possibly new) |
1da177e4 LT |
471 | add r1, sp, #S_R0 + S_OFF @ pointer to regs |
472 | cmp scno, #NR_syscalls @ check upper syscall limit | |
473 | ldmccia r1, {r0 - r3} @ have to reload r0 - r3 | |
474 | ldrcc pc, [tbl, scno, lsl #2] @ call sys_* routine | |
475 | b 2b | |
476 | ||
477 | __sys_trace_return: | |
478 | str r0, [sp, #S_R0 + S_OFF]! @ save returned r0 | |
3f471126 | 479 | mov r2, scno |
1da177e4 LT |
480 | mov r1, sp |
481 | mov r0, #1 @ trace exit [IP = 1] | |
482 | bl syscall_trace | |
483 | b ret_slow_syscall | |
484 | ||
485 | .align 5 | |
486 | #ifdef CONFIG_ALIGNMENT_TRAP | |
487 | .type __cr_alignment, #object | |
488 | __cr_alignment: | |
489 | .word cr_alignment | |
dd35afc2 NP |
490 | #endif |
491 | .ltorg | |
492 | ||
493 | /* | |
494 | * This is the syscall table declaration for native ABI syscalls. | |
495 | * With EABI a couple syscalls are obsolete and defined as sys_ni_syscall. | |
496 | */ | |
497 | #define ABI(native, compat) native | |
498 | #ifdef CONFIG_AEABI | |
499 | #define OBSOLETE(syscall) sys_ni_syscall | |
500 | #else | |
501 | #define OBSOLETE(syscall) syscall | |
1da177e4 LT |
502 | #endif |
503 | ||
504 | .type sys_call_table, #object | |
505 | ENTRY(sys_call_table) | |
506 | #include "calls.S" | |
dd35afc2 NP |
507 | #undef ABI |
508 | #undef OBSOLETE | |
1da177e4 LT |
509 | |
510 | /*============================================================================ | |
511 | * Special system call wrappers | |
512 | */ | |
513 | @ r0 = syscall number | |
567bd980 | 514 | @ r8 = syscall table |
1da177e4 | 515 | sys_syscall: |
5247593c | 516 | bic scno, r0, #__NR_OABI_SYSCALL_BASE |
1da177e4 LT |
517 | cmp scno, #__NR_syscall - __NR_SYSCALL_BASE |
518 | cmpne scno, #NR_syscalls @ check range | |
519 | stmloia sp, {r5, r6} @ shuffle args | |
520 | movlo r0, r1 | |
521 | movlo r1, r2 | |
522 | movlo r2, r3 | |
523 | movlo r3, r4 | |
524 | ldrlo pc, [tbl, scno, lsl #2] | |
525 | b sys_ni_syscall | |
93ed3970 | 526 | ENDPROC(sys_syscall) |
1da177e4 LT |
527 | |
528 | sys_fork_wrapper: | |
529 | add r0, sp, #S_OFF | |
530 | b sys_fork | |
93ed3970 | 531 | ENDPROC(sys_fork_wrapper) |
1da177e4 LT |
532 | |
533 | sys_vfork_wrapper: | |
534 | add r0, sp, #S_OFF | |
535 | b sys_vfork | |
93ed3970 | 536 | ENDPROC(sys_vfork_wrapper) |
1da177e4 LT |
537 | |
538 | sys_execve_wrapper: | |
539 | add r3, sp, #S_OFF | |
540 | b sys_execve | |
93ed3970 | 541 | ENDPROC(sys_execve_wrapper) |
1da177e4 LT |
542 | |
543 | sys_clone_wrapper: | |
544 | add ip, sp, #S_OFF | |
545 | str ip, [sp, #4] | |
546 | b sys_clone | |
93ed3970 | 547 | ENDPROC(sys_clone_wrapper) |
1da177e4 | 548 | |
1da177e4 LT |
549 | sys_sigreturn_wrapper: |
550 | add r0, sp, #S_OFF | |
653d48b2 | 551 | mov why, #0 @ prevent syscall restart handling |
1da177e4 | 552 | b sys_sigreturn |
93ed3970 | 553 | ENDPROC(sys_sigreturn_wrapper) |
1da177e4 LT |
554 | |
555 | sys_rt_sigreturn_wrapper: | |
556 | add r0, sp, #S_OFF | |
653d48b2 | 557 | mov why, #0 @ prevent syscall restart handling |
1da177e4 | 558 | b sys_rt_sigreturn |
93ed3970 | 559 | ENDPROC(sys_rt_sigreturn_wrapper) |
1da177e4 LT |
560 | |
561 | sys_sigaltstack_wrapper: | |
562 | ldr r2, [sp, #S_OFF + S_SP] | |
563 | b do_sigaltstack | |
93ed3970 | 564 | ENDPROC(sys_sigaltstack_wrapper) |
1da177e4 | 565 | |
713c4815 NP |
566 | sys_statfs64_wrapper: |
567 | teq r1, #88 | |
568 | moveq r1, #84 | |
569 | b sys_statfs64 | |
93ed3970 | 570 | ENDPROC(sys_statfs64_wrapper) |
713c4815 NP |
571 | |
572 | sys_fstatfs64_wrapper: | |
573 | teq r1, #88 | |
574 | moveq r1, #84 | |
575 | b sys_fstatfs64 | |
93ed3970 | 576 | ENDPROC(sys_fstatfs64_wrapper) |
713c4815 | 577 | |
1da177e4 LT |
578 | /* |
579 | * Note: off_4k (r5) is always units of 4K. If we can't do the requested | |
580 | * offset, we return EINVAL. | |
581 | */ | |
582 | sys_mmap2: | |
583 | #if PAGE_SHIFT > 12 | |
584 | tst r5, #PGOFF_MASK | |
585 | moveq r5, r5, lsr #PAGE_SHIFT - 12 | |
586 | streq r5, [sp, #4] | |
f8b72560 | 587 | beq sys_mmap_pgoff |
1da177e4 | 588 | mov r0, #-EINVAL |
7999d8d7 | 589 | mov pc, lr |
1da177e4 LT |
590 | #else |
591 | str r5, [sp, #4] | |
f8b72560 | 592 | b sys_mmap_pgoff |
1da177e4 | 593 | #endif |
93ed3970 | 594 | ENDPROC(sys_mmap2) |
687ad019 NP |
595 | |
596 | #ifdef CONFIG_OABI_COMPAT | |
dd35afc2 | 597 | |
687ad019 NP |
598 | /* |
599 | * These are syscalls with argument register differences | |
600 | */ | |
601 | ||
602 | sys_oabi_pread64: | |
603 | stmia sp, {r3, r4} | |
604 | b sys_pread64 | |
93ed3970 | 605 | ENDPROC(sys_oabi_pread64) |
687ad019 NP |
606 | |
607 | sys_oabi_pwrite64: | |
608 | stmia sp, {r3, r4} | |
609 | b sys_pwrite64 | |
93ed3970 | 610 | ENDPROC(sys_oabi_pwrite64) |
687ad019 NP |
611 | |
612 | sys_oabi_truncate64: | |
613 | mov r3, r2 | |
614 | mov r2, r1 | |
615 | b sys_truncate64 | |
93ed3970 | 616 | ENDPROC(sys_oabi_truncate64) |
687ad019 NP |
617 | |
618 | sys_oabi_ftruncate64: | |
619 | mov r3, r2 | |
620 | mov r2, r1 | |
621 | b sys_ftruncate64 | |
93ed3970 | 622 | ENDPROC(sys_oabi_ftruncate64) |
687ad019 NP |
623 | |
624 | sys_oabi_readahead: | |
625 | str r3, [sp] | |
626 | mov r3, r2 | |
627 | mov r2, r1 | |
628 | b sys_readahead | |
93ed3970 | 629 | ENDPROC(sys_oabi_readahead) |
687ad019 | 630 | |
dd35afc2 NP |
631 | /* |
632 | * Let's declare a second syscall table for old ABI binaries | |
633 | * using the compatibility syscall entries. | |
634 | */ | |
635 | #define ABI(native, compat) compat | |
636 | #define OBSOLETE(syscall) syscall | |
637 | ||
638 | .type sys_oabi_call_table, #object | |
639 | ENTRY(sys_oabi_call_table) | |
640 | #include "calls.S" | |
641 | #undef ABI | |
642 | #undef OBSOLETE | |
643 | ||
687ad019 NP |
644 | #endif |
645 |