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 |
9fc2552a | 67 | ENTRY(ret_to_user_from_irq) |
1da177e4 LT |
68 | ldr r1, [tsk, #TI_FLAGS] |
69 | tst r1, #_TIF_WORK_MASK | |
70 | bne work_pending | |
71 | no_work_pending: | |
d13e5edd TAP |
72 | #if defined(CONFIG_IRQSOFF_TRACER) |
73 | asm_trace_hardirqs_on | |
74 | #endif | |
f80dff9d DW |
75 | /* perform architecture specific actions before user return */ |
76 | arch_ret_to_user r1, lr | |
77 | ||
b86040a5 | 78 | restore_user_regs fast = 0, offset = 0 |
9fc2552a | 79 | ENDPROC(ret_to_user_from_irq) |
93ed3970 | 80 | ENDPROC(ret_to_user) |
1da177e4 LT |
81 | |
82 | /* | |
83 | * This is how we return from a fork. | |
84 | */ | |
85 | ENTRY(ret_from_fork) | |
86 | bl schedule_tail | |
87 | get_thread_info tsk | |
88 | ldr r1, [tsk, #TI_FLAGS] @ check for syscall tracing | |
89 | mov why, #1 | |
90 | tst r1, #_TIF_SYSCALL_TRACE @ are we tracing syscalls? | |
91 | beq ret_slow_syscall | |
92 | mov r1, sp | |
93 | mov r0, #1 @ trace exit [IP = 1] | |
94 | bl syscall_trace | |
95 | b ret_slow_syscall | |
93ed3970 | 96 | ENDPROC(ret_from_fork) |
1da177e4 | 97 | |
fa1b4f91 AV |
98 | .equ NR_syscalls,0 |
99 | #define CALL(x) .equ NR_syscalls,NR_syscalls+1 | |
1da177e4 | 100 | #include "calls.S" |
fa1b4f91 AV |
101 | #undef CALL |
102 | #define CALL(x) .long x | |
1da177e4 | 103 | |
606576ce | 104 | #ifdef CONFIG_FUNCTION_TRACER |
686ff228 RV |
105 | /* |
106 | * When compiling with -pg, gcc inserts a call to the mcount routine at the | |
107 | * start of every function. In mcount, apart from the function's address (in | |
108 | * lr), we need to get hold of the function's caller's address. | |
109 | * | |
110 | * Older GCCs (pre-4.4) inserted a call to a routine called mcount like this: | |
111 | * | |
112 | * bl mcount | |
113 | * | |
114 | * These versions have the limitation that in order for the mcount routine to | |
115 | * be able to determine the function's caller's address, an APCS-style frame | |
116 | * pointer (which is set up with something like the code below) is required. | |
117 | * | |
118 | * mov ip, sp | |
119 | * push {fp, ip, lr, pc} | |
120 | * sub fp, ip, #4 | |
121 | * | |
122 | * With EABI, these frame pointers are not available unless -mapcs-frame is | |
123 | * specified, and if building as Thumb-2, not even then. | |
124 | * | |
125 | * Newer GCCs (4.4+) solve this problem by introducing a new version of mcount, | |
126 | * with call sites like: | |
127 | * | |
128 | * push {lr} | |
129 | * bl __gnu_mcount_nc | |
130 | * | |
131 | * With these compilers, frame pointers are not necessary. | |
132 | * | |
133 | * mcount can be thought of as a function called in the middle of a subroutine | |
134 | * call. As such, it needs to be transparent for both the caller and the | |
135 | * callee: the original lr needs to be restored when leaving mcount, and no | |
136 | * registers should be clobbered. (In the __gnu_mcount_nc implementation, we | |
137 | * clobber the ip register. This is OK because the ARM calling convention | |
138 | * allows it to be clobbered in subroutines and doesn't use it to hold | |
139 | * parameters.) | |
3b6c223b RV |
140 | * |
141 | * When using dynamic ftrace, we patch out the mcount call by a "mov r0, r0" | |
142 | * for the mcount case, and a "pop {lr}" for the __gnu_mcount_nc case (see | |
143 | * arch/arm/kernel/ftrace.c). | |
686ff228 | 144 | */ |
09bfafac RV |
145 | |
146 | #ifndef CONFIG_OLD_MCOUNT | |
147 | #if (__GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 4)) | |
148 | #error Ftrace requires CONFIG_FRAME_POINTER=y with GCC older than 4.4.0. | |
149 | #endif | |
150 | #endif | |
151 | ||
d3b9dc9d RV |
152 | .macro __mcount suffix |
153 | mcount_enter | |
154 | ldr r0, =ftrace_trace_function | |
155 | ldr r2, [r0] | |
156 | adr r0, .Lftrace_stub | |
157 | cmp r0, r2 | |
158 | bne 1f | |
3b6c223b | 159 | |
376cfa87 TB |
160 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
161 | ldr r1, =ftrace_graph_return | |
162 | ldr r2, [r1] | |
163 | cmp r0, r2 | |
164 | bne ftrace_graph_caller\suffix | |
165 | ||
166 | ldr r1, =ftrace_graph_entry | |
167 | ldr r2, [r1] | |
168 | ldr r0, =ftrace_graph_entry_stub | |
169 | cmp r0, r2 | |
170 | bne ftrace_graph_caller\suffix | |
171 | #endif | |
172 | ||
d3b9dc9d | 173 | mcount_exit |
3b6c223b | 174 | |
d3b9dc9d RV |
175 | 1: mcount_get_lr r1 @ lr of instrumented func |
176 | mov r0, lr @ instrumented function | |
28e192d6 | 177 | sub r0, r0, #MCOUNT_INSN_SIZE |
d3b9dc9d RV |
178 | adr lr, BSYM(2f) |
179 | mov pc, r2 | |
180 | 2: mcount_exit | |
181 | .endm | |
014c257c | 182 | |
d3b9dc9d RV |
183 | .macro __ftrace_caller suffix |
184 | mcount_enter | |
014c257c | 185 | |
d3b9dc9d RV |
186 | mcount_get_lr r1 @ lr of instrumented func |
187 | mov r0, lr @ instrumented function | |
188 | sub r0, r0, #MCOUNT_INSN_SIZE | |
189 | ||
190 | .globl ftrace_call\suffix | |
191 | ftrace_call\suffix: | |
28e192d6 | 192 | bl ftrace_stub |
d3b9dc9d | 193 | |
dd686eb1 RV |
194 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
195 | .globl ftrace_graph_call\suffix | |
196 | ftrace_graph_call\suffix: | |
197 | mov r0, r0 | |
198 | #endif | |
199 | ||
d3b9dc9d RV |
200 | mcount_exit |
201 | .endm | |
014c257c | 202 | |
376cfa87 TB |
203 | .macro __ftrace_graph_caller |
204 | sub r0, fp, #4 @ &lr of instrumented routine (&parent) | |
dd686eb1 RV |
205 | #ifdef CONFIG_DYNAMIC_FTRACE |
206 | @ called from __ftrace_caller, saved in mcount_enter | |
207 | ldr r1, [sp, #16] @ instrumented routine (func) | |
208 | #else | |
209 | @ called from __mcount, untouched in lr | |
376cfa87 | 210 | mov r1, lr @ instrumented routine (func) |
dd686eb1 | 211 | #endif |
376cfa87 TB |
212 | sub r1, r1, #MCOUNT_INSN_SIZE |
213 | mov r2, fp @ frame pointer | |
214 | bl prepare_ftrace_return | |
215 | mcount_exit | |
216 | .endm | |
014c257c | 217 | |
3b6c223b | 218 | #ifdef CONFIG_OLD_MCOUNT |
d3b9dc9d RV |
219 | /* |
220 | * mcount | |
221 | */ | |
222 | ||
223 | .macro mcount_enter | |
224 | stmdb sp!, {r0-r3, lr} | |
225 | .endm | |
226 | ||
227 | .macro mcount_get_lr reg | |
228 | ldr \reg, [fp, #-4] | |
229 | .endm | |
230 | ||
231 | .macro mcount_exit | |
232 | ldr lr, [fp, #-4] | |
233 | ldmia sp!, {r0-r3, pc} | |
234 | .endm | |
235 | ||
3b6c223b | 236 | ENTRY(mcount) |
d3b9dc9d | 237 | #ifdef CONFIG_DYNAMIC_FTRACE |
3b6c223b RV |
238 | stmdb sp!, {lr} |
239 | ldr lr, [fp, #-4] | |
240 | ldmia sp!, {pc} | |
d3b9dc9d RV |
241 | #else |
242 | __mcount _old | |
243 | #endif | |
72fa62fa | 244 | ENDPROC(mcount) |
014c257c | 245 | |
d3b9dc9d | 246 | #ifdef CONFIG_DYNAMIC_FTRACE |
3b6c223b | 247 | ENTRY(ftrace_caller_old) |
d3b9dc9d | 248 | __ftrace_caller _old |
3b6c223b RV |
249 | ENDPROC(ftrace_caller_old) |
250 | #endif | |
014c257c | 251 | |
376cfa87 TB |
252 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
253 | ENTRY(ftrace_graph_caller_old) | |
254 | __ftrace_graph_caller | |
255 | ENDPROC(ftrace_graph_caller_old) | |
256 | #endif | |
014c257c | 257 | |
d3b9dc9d RV |
258 | .purgem mcount_enter |
259 | .purgem mcount_get_lr | |
260 | .purgem mcount_exit | |
261 | #endif | |
014c257c | 262 | |
d3b9dc9d RV |
263 | /* |
264 | * __gnu_mcount_nc | |
265 | */ | |
266 | ||
267 | .macro mcount_enter | |
28e192d6 | 268 | stmdb sp!, {r0-r3, lr} |
d3b9dc9d RV |
269 | .endm |
270 | ||
271 | .macro mcount_get_lr reg | |
272 | ldr \reg, [sp, #20] | |
273 | .endm | |
274 | ||
275 | .macro mcount_exit | |
28e192d6 RV |
276 | ldmia sp!, {r0-r3, ip, lr} |
277 | mov pc, ip | |
d3b9dc9d | 278 | .endm |
181f817e | 279 | |
d3b9dc9d RV |
280 | ENTRY(__gnu_mcount_nc) |
281 | #ifdef CONFIG_DYNAMIC_FTRACE | |
282 | mov ip, lr | |
283 | ldmia sp!, {lr} | |
28e192d6 | 284 | mov pc, ip |
d3b9dc9d RV |
285 | #else |
286 | __mcount | |
287 | #endif | |
72fa62fa | 288 | ENDPROC(__gnu_mcount_nc) |
181f817e | 289 | |
d3b9dc9d RV |
290 | #ifdef CONFIG_DYNAMIC_FTRACE |
291 | ENTRY(ftrace_caller) | |
292 | __ftrace_caller | |
293 | ENDPROC(ftrace_caller) | |
09bfafac | 294 | #endif |
014c257c | 295 | |
376cfa87 TB |
296 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
297 | ENTRY(ftrace_graph_caller) | |
298 | __ftrace_graph_caller | |
299 | ENDPROC(ftrace_graph_caller) | |
09bfafac | 300 | #endif |
014c257c | 301 | |
d3b9dc9d RV |
302 | .purgem mcount_enter |
303 | .purgem mcount_get_lr | |
304 | .purgem mcount_exit | |
014c257c | 305 | |
376cfa87 TB |
306 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
307 | .globl return_to_handler | |
308 | return_to_handler: | |
309 | stmdb sp!, {r0-r3} | |
310 | mov r0, fp @ frame pointer | |
311 | bl ftrace_return_to_handler | |
312 | mov lr, r0 @ r0 has real ret addr | |
313 | ldmia sp!, {r0-r3} | |
314 | mov pc, lr | |
315 | #endif | |
014c257c | 316 | |
72fa62fa | 317 | ENTRY(ftrace_stub) |
a3ba87a6 | 318 | .Lftrace_stub: |
28e192d6 | 319 | mov pc, lr |
72fa62fa | 320 | ENDPROC(ftrace_stub) |
014c257c | 321 | |
606576ce | 322 | #endif /* CONFIG_FUNCTION_TRACER */ |
014c257c | 323 | |
1da177e4 LT |
324 | /*============================================================================= |
325 | * SWI handler | |
326 | *----------------------------------------------------------------------------- | |
327 | */ | |
328 | ||
329 | /* If we're optimising for StrongARM the resulting code won't | |
330 | run on an ARM7 and we can save a couple of instructions. | |
331 | --pb */ | |
332 | #ifdef CONFIG_CPU_ARM710 | |
3f2829a3 NP |
333 | #define A710(code...) code |
334 | .Larm710bug: | |
1da177e4 LT |
335 | ldmia sp, {r0 - lr}^ @ Get calling r0 - lr |
336 | mov r0, r0 | |
1da177e4 | 337 | add sp, sp, #S_FRAME_SIZE |
60ac133a | 338 | subs pc, lr, #4 |
1da177e4 | 339 | #else |
3f2829a3 | 340 | #define A710(code...) |
1da177e4 LT |
341 | #endif |
342 | ||
343 | .align 5 | |
344 | ENTRY(vector_swi) | |
f4dc9a4c RK |
345 | sub sp, sp, #S_FRAME_SIZE |
346 | stmia sp, {r0 - r12} @ Calling r0 - r12 | |
b86040a5 CM |
347 | ARM( add r8, sp, #S_PC ) |
348 | ARM( stmdb r8, {sp, lr}^ ) @ Calling sp, lr | |
349 | THUMB( mov r8, sp ) | |
350 | THUMB( store_user_sp_lr r8, r10, S_SP ) @ calling sp, lr | |
f4dc9a4c RK |
351 | mrs r8, spsr @ called from non-FIQ mode, so ok. |
352 | str lr, [sp, #S_PC] @ Save calling PC | |
353 | str r8, [sp, #S_PSR] @ Save CPSR | |
354 | str r0, [sp, #S_OLD_R0] @ Save OLD_R0 | |
1da177e4 | 355 | zero_fp |
e0f9f4a6 RK |
356 | |
357 | /* | |
358 | * Get the system call number. | |
359 | */ | |
3f2829a3 | 360 | |
dd35afc2 | 361 | #if defined(CONFIG_OABI_COMPAT) |
3f2829a3 | 362 | |
dd35afc2 NP |
363 | /* |
364 | * If we have CONFIG_OABI_COMPAT then we need to look at the swi | |
365 | * value to determine if it is an EABI or an old ABI call. | |
366 | */ | |
367 | #ifdef CONFIG_ARM_THUMB | |
368 | tst r8, #PSR_T_BIT | |
369 | movne r10, #0 @ no thumb OABI emulation | |
370 | ldreq r10, [lr, #-4] @ get SWI instruction | |
371 | #else | |
372 | ldr r10, [lr, #-4] @ get SWI instruction | |
373 | A710( and ip, r10, #0x0f000000 @ check for SWI ) | |
374 | A710( teq ip, #0x0f000000 ) | |
375 | A710( bne .Larm710bug ) | |
376 | #endif | |
26584853 CM |
377 | #ifdef CONFIG_CPU_ENDIAN_BE8 |
378 | rev r10, r10 @ little endian instruction | |
379 | #endif | |
dd35afc2 NP |
380 | |
381 | #elif defined(CONFIG_AEABI) | |
382 | ||
383 | /* | |
384 | * Pure EABI user space always put syscall number into scno (r7). | |
385 | */ | |
3f2829a3 NP |
386 | A710( ldr ip, [lr, #-4] @ get SWI instruction ) |
387 | A710( and ip, ip, #0x0f000000 @ check for SWI ) | |
388 | A710( teq ip, #0x0f000000 ) | |
389 | A710( bne .Larm710bug ) | |
dd35afc2 | 390 | |
3f2829a3 | 391 | #elif defined(CONFIG_ARM_THUMB) |
dd35afc2 NP |
392 | |
393 | /* Legacy ABI only, possibly thumb mode. */ | |
e0f9f4a6 RK |
394 | tst r8, #PSR_T_BIT @ this is SPSR from save_user_regs |
395 | addne scno, r7, #__NR_SYSCALL_BASE @ put OS number in | |
396 | ldreq scno, [lr, #-4] | |
dd35afc2 | 397 | |
e0f9f4a6 | 398 | #else |
dd35afc2 NP |
399 | |
400 | /* Legacy ABI only. */ | |
e0f9f4a6 | 401 | ldr scno, [lr, #-4] @ get SWI instruction |
3f2829a3 NP |
402 | A710( and ip, scno, #0x0f000000 @ check for SWI ) |
403 | A710( teq ip, #0x0f000000 ) | |
404 | A710( bne .Larm710bug ) | |
dd35afc2 | 405 | |
e0f9f4a6 | 406 | #endif |
1da177e4 LT |
407 | |
408 | #ifdef CONFIG_ALIGNMENT_TRAP | |
409 | ldr ip, __cr_alignment | |
410 | ldr ip, [ip] | |
411 | mcr p15, 0, ip, c1, c0 @ update control register | |
412 | #endif | |
1ec42c0c | 413 | enable_irq |
1da177e4 | 414 | |
1da177e4 | 415 | get_thread_info tsk |
dd35afc2 | 416 | adr tbl, sys_call_table @ load syscall table pointer |
dd35afc2 NP |
417 | |
418 | #if defined(CONFIG_OABI_COMPAT) | |
419 | /* | |
420 | * If the swi argument is zero, this is an EABI call and we do nothing. | |
421 | * | |
422 | * If this is an old ABI call, get the syscall number into scno and | |
423 | * get the old ABI syscall table address. | |
424 | */ | |
425 | bics r10, r10, #0xff000000 | |
426 | eorne scno, r10, #__NR_OABI_SYSCALL_BASE | |
427 | ldrne tbl, =sys_oabi_call_table | |
428 | #elif !defined(CONFIG_AEABI) | |
1da177e4 | 429 | bic scno, scno, #0xff000000 @ mask off SWI op-code |
e0f9f4a6 | 430 | eor scno, scno, #__NR_SYSCALL_BASE @ check OS number |
3f2829a3 | 431 | #endif |
dd35afc2 | 432 | |
70c70d97 | 433 | ldr r10, [tsk, #TI_FLAGS] @ check for syscall tracing |
3f2829a3 | 434 | stmdb sp!, {r4, r5} @ push fifth and sixth args |
70c70d97 NP |
435 | |
436 | #ifdef CONFIG_SECCOMP | |
437 | tst r10, #_TIF_SECCOMP | |
438 | beq 1f | |
439 | mov r0, scno | |
440 | bl __secure_computing | |
441 | add r0, sp, #S_R0 + S_OFF @ pointer to regs | |
442 | ldmia r0, {r0 - r3} @ have to reload r0 - r3 | |
443 | 1: | |
444 | #endif | |
445 | ||
446 | tst r10, #_TIF_SYSCALL_TRACE @ are we tracing syscalls? | |
1da177e4 LT |
447 | bne __sys_trace |
448 | ||
1da177e4 | 449 | cmp scno, #NR_syscalls @ check upper syscall limit |
b86040a5 | 450 | adr lr, BSYM(ret_fast_syscall) @ return address |
1da177e4 LT |
451 | ldrcc pc, [tbl, scno, lsl #2] @ call sys_* routine |
452 | ||
453 | add r1, sp, #S_OFF | |
454 | 2: mov why, #0 @ no longer a real syscall | |
e0f9f4a6 RK |
455 | cmp scno, #(__ARM_NR_BASE - __NR_SYSCALL_BASE) |
456 | eor r0, scno, #__NR_SYSCALL_BASE @ put OS number back | |
1da177e4 LT |
457 | bcs arm_syscall |
458 | b sys_ni_syscall @ not private func | |
93ed3970 | 459 | ENDPROC(vector_swi) |
1da177e4 LT |
460 | |
461 | /* | |
462 | * This is the really slow path. We're going to be doing | |
463 | * context switches, and waiting for our parent to respond. | |
464 | */ | |
465 | __sys_trace: | |
3f471126 | 466 | mov r2, scno |
1da177e4 LT |
467 | add r1, sp, #S_OFF |
468 | mov r0, #0 @ trace entry [IP = 0] | |
469 | bl syscall_trace | |
470 | ||
b86040a5 | 471 | adr lr, BSYM(__sys_trace_return) @ return address |
3f471126 | 472 | mov scno, r0 @ syscall number (possibly new) |
1da177e4 LT |
473 | add r1, sp, #S_R0 + S_OFF @ pointer to regs |
474 | cmp scno, #NR_syscalls @ check upper syscall limit | |
475 | ldmccia r1, {r0 - r3} @ have to reload r0 - r3 | |
476 | ldrcc pc, [tbl, scno, lsl #2] @ call sys_* routine | |
477 | b 2b | |
478 | ||
479 | __sys_trace_return: | |
480 | str r0, [sp, #S_R0 + S_OFF]! @ save returned r0 | |
3f471126 | 481 | mov r2, scno |
1da177e4 LT |
482 | mov r1, sp |
483 | mov r0, #1 @ trace exit [IP = 1] | |
484 | bl syscall_trace | |
485 | b ret_slow_syscall | |
486 | ||
487 | .align 5 | |
488 | #ifdef CONFIG_ALIGNMENT_TRAP | |
489 | .type __cr_alignment, #object | |
490 | __cr_alignment: | |
491 | .word cr_alignment | |
dd35afc2 NP |
492 | #endif |
493 | .ltorg | |
494 | ||
495 | /* | |
496 | * This is the syscall table declaration for native ABI syscalls. | |
497 | * With EABI a couple syscalls are obsolete and defined as sys_ni_syscall. | |
498 | */ | |
499 | #define ABI(native, compat) native | |
500 | #ifdef CONFIG_AEABI | |
501 | #define OBSOLETE(syscall) sys_ni_syscall | |
502 | #else | |
503 | #define OBSOLETE(syscall) syscall | |
1da177e4 LT |
504 | #endif |
505 | ||
506 | .type sys_call_table, #object | |
507 | ENTRY(sys_call_table) | |
508 | #include "calls.S" | |
dd35afc2 NP |
509 | #undef ABI |
510 | #undef OBSOLETE | |
1da177e4 LT |
511 | |
512 | /*============================================================================ | |
513 | * Special system call wrappers | |
514 | */ | |
515 | @ r0 = syscall number | |
567bd980 | 516 | @ r8 = syscall table |
1da177e4 | 517 | sys_syscall: |
5247593c | 518 | bic scno, r0, #__NR_OABI_SYSCALL_BASE |
1da177e4 LT |
519 | cmp scno, #__NR_syscall - __NR_SYSCALL_BASE |
520 | cmpne scno, #NR_syscalls @ check range | |
521 | stmloia sp, {r5, r6} @ shuffle args | |
522 | movlo r0, r1 | |
523 | movlo r1, r2 | |
524 | movlo r2, r3 | |
525 | movlo r3, r4 | |
526 | ldrlo pc, [tbl, scno, lsl #2] | |
527 | b sys_ni_syscall | |
93ed3970 | 528 | ENDPROC(sys_syscall) |
1da177e4 LT |
529 | |
530 | sys_fork_wrapper: | |
531 | add r0, sp, #S_OFF | |
532 | b sys_fork | |
93ed3970 | 533 | ENDPROC(sys_fork_wrapper) |
1da177e4 LT |
534 | |
535 | sys_vfork_wrapper: | |
536 | add r0, sp, #S_OFF | |
537 | b sys_vfork | |
93ed3970 | 538 | ENDPROC(sys_vfork_wrapper) |
1da177e4 LT |
539 | |
540 | sys_execve_wrapper: | |
541 | add r3, sp, #S_OFF | |
542 | b sys_execve | |
93ed3970 | 543 | ENDPROC(sys_execve_wrapper) |
1da177e4 LT |
544 | |
545 | sys_clone_wrapper: | |
546 | add ip, sp, #S_OFF | |
547 | str ip, [sp, #4] | |
548 | b sys_clone | |
93ed3970 | 549 | ENDPROC(sys_clone_wrapper) |
1da177e4 | 550 | |
1da177e4 LT |
551 | sys_sigreturn_wrapper: |
552 | add r0, sp, #S_OFF | |
653d48b2 | 553 | mov why, #0 @ prevent syscall restart handling |
1da177e4 | 554 | b sys_sigreturn |
93ed3970 | 555 | ENDPROC(sys_sigreturn_wrapper) |
1da177e4 LT |
556 | |
557 | sys_rt_sigreturn_wrapper: | |
558 | add r0, sp, #S_OFF | |
653d48b2 | 559 | mov why, #0 @ prevent syscall restart handling |
1da177e4 | 560 | b sys_rt_sigreturn |
93ed3970 | 561 | ENDPROC(sys_rt_sigreturn_wrapper) |
1da177e4 LT |
562 | |
563 | sys_sigaltstack_wrapper: | |
564 | ldr r2, [sp, #S_OFF + S_SP] | |
565 | b do_sigaltstack | |
93ed3970 | 566 | ENDPROC(sys_sigaltstack_wrapper) |
1da177e4 | 567 | |
713c4815 NP |
568 | sys_statfs64_wrapper: |
569 | teq r1, #88 | |
570 | moveq r1, #84 | |
571 | b sys_statfs64 | |
93ed3970 | 572 | ENDPROC(sys_statfs64_wrapper) |
713c4815 NP |
573 | |
574 | sys_fstatfs64_wrapper: | |
575 | teq r1, #88 | |
576 | moveq r1, #84 | |
577 | b sys_fstatfs64 | |
93ed3970 | 578 | ENDPROC(sys_fstatfs64_wrapper) |
713c4815 | 579 | |
1da177e4 LT |
580 | /* |
581 | * Note: off_4k (r5) is always units of 4K. If we can't do the requested | |
582 | * offset, we return EINVAL. | |
583 | */ | |
584 | sys_mmap2: | |
585 | #if PAGE_SHIFT > 12 | |
586 | tst r5, #PGOFF_MASK | |
587 | moveq r5, r5, lsr #PAGE_SHIFT - 12 | |
588 | streq r5, [sp, #4] | |
f8b72560 | 589 | beq sys_mmap_pgoff |
1da177e4 | 590 | mov r0, #-EINVAL |
7999d8d7 | 591 | mov pc, lr |
1da177e4 LT |
592 | #else |
593 | str r5, [sp, #4] | |
f8b72560 | 594 | b sys_mmap_pgoff |
1da177e4 | 595 | #endif |
93ed3970 | 596 | ENDPROC(sys_mmap2) |
687ad019 NP |
597 | |
598 | #ifdef CONFIG_OABI_COMPAT | |
dd35afc2 | 599 | |
687ad019 NP |
600 | /* |
601 | * These are syscalls with argument register differences | |
602 | */ | |
603 | ||
604 | sys_oabi_pread64: | |
605 | stmia sp, {r3, r4} | |
606 | b sys_pread64 | |
93ed3970 | 607 | ENDPROC(sys_oabi_pread64) |
687ad019 NP |
608 | |
609 | sys_oabi_pwrite64: | |
610 | stmia sp, {r3, r4} | |
611 | b sys_pwrite64 | |
93ed3970 | 612 | ENDPROC(sys_oabi_pwrite64) |
687ad019 NP |
613 | |
614 | sys_oabi_truncate64: | |
615 | mov r3, r2 | |
616 | mov r2, r1 | |
617 | b sys_truncate64 | |
93ed3970 | 618 | ENDPROC(sys_oabi_truncate64) |
687ad019 NP |
619 | |
620 | sys_oabi_ftruncate64: | |
621 | mov r3, r2 | |
622 | mov r2, r1 | |
623 | b sys_ftruncate64 | |
93ed3970 | 624 | ENDPROC(sys_oabi_ftruncate64) |
687ad019 NP |
625 | |
626 | sys_oabi_readahead: | |
627 | str r3, [sp] | |
628 | mov r3, r2 | |
629 | mov r2, r1 | |
630 | b sys_readahead | |
93ed3970 | 631 | ENDPROC(sys_oabi_readahead) |
687ad019 | 632 | |
dd35afc2 NP |
633 | /* |
634 | * Let's declare a second syscall table for old ABI binaries | |
635 | * using the compatibility syscall entries. | |
636 | */ | |
637 | #define ABI(native, compat) compat | |
638 | #define OBSOLETE(syscall) syscall | |
639 | ||
640 | .type sys_oabi_call_table, #object | |
641 | ENTRY(sys_oabi_call_table) | |
642 | #include "calls.S" | |
643 | #undef ABI | |
644 | #undef OBSOLETE | |
645 | ||
687ad019 NP |
646 | #endif |
647 |