1 | /* |
2 | * Copyright (c) 2000-2022 Apple Inc. All rights reserved. |
3 | */ |
4 | |
5 | #include <kern/bits.h> |
6 | #include <kern/task.h> |
7 | #include <kern/thread.h> |
8 | #include <kern/assert.h> |
9 | #include <kern/clock.h> |
10 | #include <kern/locks.h> |
11 | #include <kern/sched_prim.h> |
12 | #include <mach/machine/thread_status.h> |
13 | #include <mach/thread_act.h> |
14 | #include <machine/machine_routines.h> |
15 | #include <arm/thread.h> |
16 | #include <arm64/proc_reg.h> |
17 | #include <pexpert/pexpert.h> |
18 | |
19 | #include <sys/kernel.h> |
20 | #include <sys/kern_debug.h> |
21 | #include <sys/vm.h> |
22 | #include <sys/proc_internal.h> |
23 | #include <sys/syscall.h> |
24 | #include <sys/systm.h> |
25 | #include <sys/user.h> |
26 | #include <sys/errno.h> |
27 | #include <sys/kdebug.h> |
28 | #include <sys/sysent.h> |
29 | #include <sys/sysproto.h> |
30 | #include <sys/kauth.h> |
31 | #include <sys/bitstring.h> |
32 | |
33 | #include <security/audit/audit.h> |
34 | |
35 | #if CONFIG_MACF |
36 | #include <security/mac_framework.h> |
37 | #endif |
38 | |
39 | #if CONFIG_DTRACE |
40 | extern int32_t dtrace_systrace_syscall(struct proc *, void *, int *); |
41 | extern void dtrace_systrace_syscall_return(unsigned short, int, int *); |
42 | #endif /* CONFIG_DTRACE */ |
43 | |
44 | extern void |
45 | unix_syscall(struct arm_saved_state * regs, thread_t thread_act, struct proc * proc); |
46 | |
47 | static int arm_get_syscall_args(uthread_t, struct arm_saved_state *, const struct sysent *); |
48 | static int arm_get_u32_syscall_args(uthread_t, arm_saved_state32_t *, const struct sysent *); |
49 | static void arm_prepare_u32_syscall_return(const struct sysent *, arm_saved_state_t *, uthread_t, int); |
50 | static void arm_prepare_syscall_return(const struct sysent *, struct arm_saved_state *, uthread_t, int); |
51 | static unsigned short arm_get_syscall_number(struct arm_saved_state *); |
52 | static void arm_trace_unix_syscall(int, struct arm_saved_state *); |
53 | static void arm_clear_syscall_error(struct arm_saved_state *); |
54 | #define save_r0 r[0] |
55 | #define save_r1 r[1] |
56 | #define save_r2 r[2] |
57 | #define save_r3 r[3] |
58 | #define save_r4 r[4] |
59 | #define save_r5 r[5] |
60 | #define save_r6 r[6] |
61 | #define save_r7 r[7] |
62 | #define save_r8 r[8] |
63 | #define save_r9 r[9] |
64 | #define save_r10 r[10] |
65 | #define save_r11 r[11] |
66 | #define save_r12 r[12] |
67 | #define save_r13 r[13] |
68 | |
69 | #if COUNT_SYSCALLS |
70 | __XNU_PRIVATE_EXTERN int do_count_syscalls = 1; |
71 | __XNU_PRIVATE_EXTERN int syscalls_log[SYS_MAXSYSCALL]; |
72 | #endif |
73 | |
74 | #define code_is_kdebug_trace(code) (((code) == SYS_kdebug_trace) || \ |
75 | ((code) == SYS_kdebug_trace64) || \ |
76 | ((code) == SYS_kdebug_trace_string)) |
77 | |
78 | #if CONFIG_DEBUG_SYSCALL_REJECTION |
79 | extern int mach_trap_count; |
80 | #endif |
81 | |
82 | /* |
83 | * Function: unix_syscall |
84 | * |
85 | * Inputs: regs - pointer to Process Control Block |
86 | * |
87 | * Outputs: none |
88 | */ |
89 | void |
90 | unix_syscall( |
91 | struct arm_saved_state * state, |
92 | thread_t thread_act, |
93 | struct proc * proc) |
94 | { |
95 | const struct sysent *callp; |
96 | int error; |
97 | unsigned short code, syscode; |
98 | pid_t pid; |
99 | struct uthread *uthread = get_bsdthread_info(thread_act); |
100 | |
101 | uthread_reset_proc_refcount(uthread); |
102 | |
103 | code = arm_get_syscall_number(state); |
104 | |
105 | #define unix_syscall_kprintf(x...) /* kprintf("unix_syscall: " x) */ |
106 | |
107 | if (kdebug_enable && !code_is_kdebug_trace(code)) { |
108 | arm_trace_unix_syscall(code, state); |
109 | } |
110 | |
111 | |
112 | syscode = (code < nsysent) ? code : SYS_invalid; |
113 | callp = &sysent[syscode]; |
114 | |
115 | /* |
116 | * sy_narg is inaccurate on ARM if a 64 bit parameter is specified. Since user_addr_t |
117 | * is currently a 32 bit type, this is really a long word count. See rdar://problem/6104668. |
118 | */ |
119 | if (callp->sy_narg != 0) { |
120 | if (arm_get_syscall_args(uthread, state, callp) != 0) { |
121 | /* Too many arguments, or something failed */ |
122 | unix_syscall_kprintf("arm_get_syscall_args failed.\n" ); |
123 | callp = &sysent[SYS_invalid]; |
124 | } |
125 | } |
126 | |
127 | uthread->uu_flag |= UT_NOTCANCELPT; |
128 | uthread->syscall_code = code; |
129 | |
130 | uthread->uu_rval[0] = 0; |
131 | |
132 | /* |
133 | * r4 is volatile, if we set it to regs->save_r4 here the child |
134 | * will have parents r4 after execve |
135 | */ |
136 | uthread->uu_rval[1] = 0; |
137 | |
138 | error = 0; |
139 | |
140 | /* |
141 | * ARM runtime will call cerror if the carry bit is set after a |
142 | * system call, so clear it here for the common case of success. |
143 | */ |
144 | arm_clear_syscall_error(state); |
145 | |
146 | #if COUNT_SYSCALLS |
147 | if (do_count_syscalls > 0) { |
148 | syscalls_log[code]++; |
149 | } |
150 | #endif |
151 | pid = proc_pid(proc); |
152 | |
153 | #ifdef CONFIG_IOCOUNT_TRACE |
154 | uthread->uu_iocount = 0; |
155 | uthread->uu_vpindex = 0; |
156 | #endif |
157 | unix_syscall_kprintf("code %d (pid %d - %s, tid %lld)\n" , code, |
158 | pid, proc->p_comm, thread_tid(current_thread())); |
159 | |
160 | #if CONFIG_MACF |
161 | if (__improbable(proc_syscall_filter_mask(proc) != NULL && !bitstr_test(proc_syscall_filter_mask(proc), syscode))) { |
162 | error = mac_proc_check_syscall_unix(proc, scnum: syscode); |
163 | if (error) { |
164 | goto skip_syscall; |
165 | } |
166 | } |
167 | #endif /* CONFIG_MACF */ |
168 | |
169 | #if CONFIG_DEBUG_SYSCALL_REJECTION |
170 | unsigned int call_number = mach_trap_count + syscode; |
171 | if (__improbable(uthread->syscall_rejection_mask != NULL && |
172 | uthread_syscall_rejection_is_enabled(uthread)) && |
173 | !bitmap_test(uthread->syscall_rejection_mask, call_number)) { |
174 | if (debug_syscall_rejection_handle(syscode)) { |
175 | goto skip_syscall; |
176 | } |
177 | } |
178 | #endif /* CONFIG_DEBUG_SYSCALL_REJECTION */ |
179 | |
180 | AUDIT_SYSCALL_ENTER(code, proc, uthread); |
181 | error = (*(callp->sy_call))(proc, &uthread->uu_arg[0], &(uthread->uu_rval[0])); |
182 | AUDIT_SYSCALL_EXIT(code, proc, uthread, error); |
183 | |
184 | #if CONFIG_MACF |
185 | skip_syscall: |
186 | #endif /* CONFIG_MACF */ |
187 | |
188 | unix_syscall_kprintf("code %d, error %d, results %x, %x (pid %d - %s, tid %lld)\n" , code, error, |
189 | uthread->uu_rval[0], uthread->uu_rval[1], |
190 | pid, get_bsdtask_info(current_task()) ? proc->p_comm : "unknown" , thread_tid(current_thread())); |
191 | |
192 | #ifdef CONFIG_IOCOUNT_TRACE |
193 | if (uthread->uu_iocount) { |
194 | printf("system call returned with uu_iocount(%d) != 0" , |
195 | uthread->uu_iocount); |
196 | } |
197 | #endif |
198 | #if CONFIG_DTRACE |
199 | uthread->t_dtrace_errno = error; |
200 | #endif /* CONFIG_DTRACE */ |
201 | #if DEBUG || DEVELOPMENT |
202 | kern_allocation_name_t |
203 | prior __assert_only = thread_set_allocation_name(NULL); |
204 | assertf(prior == NULL, "thread_set_allocation_name(\"%s\") not cleared" , kern_allocation_get_name(prior)); |
205 | #endif /* DEBUG || DEVELOPMENT */ |
206 | |
207 | arm_prepare_syscall_return(callp, state, uthread, error); |
208 | |
209 | uthread->uu_flag &= ~UT_NOTCANCELPT; |
210 | uthread->syscall_code = 0; |
211 | |
212 | if (uthread->uu_lowpri_window) { |
213 | /* |
214 | * task is marked as a low priority I/O type |
215 | * and the I/O we issued while in this system call |
216 | * collided with normal I/O operations... we'll |
217 | * delay in order to mitigate the impact of this |
218 | * task on the normal operation of the system |
219 | */ |
220 | throttle_lowpri_io(sleep_amount: 1); |
221 | } |
222 | if (kdebug_enable && !code_is_kdebug_trace(code)) { |
223 | KDBG_RELEASE(BSDDBG_CODE(DBG_BSD_EXCP_SC, code) | DBG_FUNC_END, |
224 | error, uthread->uu_rval[0], uthread->uu_rval[1], pid); |
225 | } |
226 | |
227 | uthread_assert_zero_proc_refcount(uthread); |
228 | } |
229 | |
230 | void |
231 | unix_syscall_return(int error) |
232 | { |
233 | thread_t thread_act; |
234 | struct uthread *uthread; |
235 | struct proc *proc; |
236 | struct arm_saved_state *regs; |
237 | unsigned short code; |
238 | const struct sysent *callp; |
239 | |
240 | #define unix_syscall_return_kprintf(x...) /* kprintf("unix_syscall_retur |
241 | * n: " x) */ |
242 | |
243 | thread_act = current_thread(); |
244 | proc = current_proc(); |
245 | uthread = get_bsdthread_info(thread_act); |
246 | |
247 | regs = find_user_regs(thread_act); |
248 | code = uthread->syscall_code; |
249 | callp = (code >= nsysent) ? &sysent[SYS_invalid] : &sysent[code]; |
250 | |
251 | #if CONFIG_DTRACE |
252 | if (callp->sy_call == dtrace_systrace_syscall) { |
253 | dtrace_systrace_syscall_return( code, error, uthread->uu_rval ); |
254 | } |
255 | #endif /* CONFIG_DTRACE */ |
256 | #if DEBUG || DEVELOPMENT |
257 | kern_allocation_name_t |
258 | prior __assert_only = thread_set_allocation_name(NULL); |
259 | assertf(prior == NULL, "thread_set_allocation_name(\"%s\") not cleared" , kern_allocation_get_name(prior)); |
260 | #endif /* DEBUG || DEVELOPMENT */ |
261 | |
262 | AUDIT_SYSCALL_EXIT(code, proc, uthread, error); |
263 | |
264 | /* |
265 | * Get index into sysent table |
266 | */ |
267 | arm_prepare_syscall_return(callp, regs, uthread, error); |
268 | |
269 | uthread->uu_flag &= ~UT_NOTCANCELPT; |
270 | uthread->syscall_code = 0; |
271 | |
272 | if (uthread->uu_lowpri_window) { |
273 | /* |
274 | * task is marked as a low priority I/O type |
275 | * and the I/O we issued while in this system call |
276 | * collided with normal I/O operations... we'll |
277 | * delay in order to mitigate the impact of this |
278 | * task on the normal operation of the system |
279 | */ |
280 | throttle_lowpri_io(sleep_amount: 1); |
281 | } |
282 | if (kdebug_enable && !code_is_kdebug_trace(code)) { |
283 | KDBG_RELEASE(BSDDBG_CODE(DBG_BSD_EXCP_SC, code) | DBG_FUNC_END, |
284 | error, uthread->uu_rval[0], uthread->uu_rval[1], proc_getpid(proc)); |
285 | } |
286 | |
287 | thread_exception_return(); |
288 | /* NOTREACHED */ |
289 | } |
290 | |
291 | static void |
292 | arm_prepare_u32_syscall_return(const struct sysent *callp, arm_saved_state_t *regs, uthread_t uthread, int error) |
293 | { |
294 | assert(is_saved_state32(regs)); |
295 | |
296 | arm_saved_state32_t *ss32 = saved_state32(iss: regs); |
297 | |
298 | if (error == ERESTART) { |
299 | ss32->pc -= 4; |
300 | } else if (error != EJUSTRETURN) { |
301 | if (error) { |
302 | ss32->save_r0 = error; |
303 | ss32->save_r1 = 0; |
304 | /* set the carry bit to execute cerror routine */ |
305 | ss32->cpsr |= PSR_CF; |
306 | unix_syscall_return_kprintf("error: setting carry to trigger cerror call\n" ); |
307 | } else { /* (not error) */ |
308 | switch (callp->sy_return_type) { |
309 | case _SYSCALL_RET_INT_T: |
310 | case _SYSCALL_RET_UINT_T: |
311 | case _SYSCALL_RET_OFF_T: |
312 | case _SYSCALL_RET_ADDR_T: |
313 | case _SYSCALL_RET_SIZE_T: |
314 | case _SYSCALL_RET_SSIZE_T: |
315 | case _SYSCALL_RET_UINT64_T: |
316 | ss32->save_r0 = uthread->uu_rval[0]; |
317 | ss32->save_r1 = uthread->uu_rval[1]; |
318 | break; |
319 | case _SYSCALL_RET_NONE: |
320 | ss32->save_r0 = 0; |
321 | ss32->save_r1 = 0; |
322 | break; |
323 | default: |
324 | panic("unix_syscall: unknown return type" ); |
325 | break; |
326 | } |
327 | } |
328 | } |
329 | /* else (error == EJUSTRETURN) { nothing } */ |
330 | } |
331 | |
332 | static void |
333 | arm_trace_u32_unix_syscall(int code, arm_saved_state32_t *regs) |
334 | { |
335 | bool indirect = (regs->save_r12 == 0); |
336 | if (indirect) { |
337 | KDBG_RELEASE(BSDDBG_CODE(DBG_BSD_EXCP_SC, code) | DBG_FUNC_START, |
338 | regs->save_r1, regs->save_r2, regs->save_r3, regs->save_r4); |
339 | } else { |
340 | KDBG_RELEASE(BSDDBG_CODE(DBG_BSD_EXCP_SC, code) | DBG_FUNC_START, |
341 | regs->save_r0, regs->save_r1, regs->save_r2, regs->save_r3); |
342 | } |
343 | } |
344 | |
345 | static void |
346 | arm_clear_u32_syscall_error(arm_saved_state32_t *regs) |
347 | { |
348 | regs->cpsr &= ~PSR_CF; |
349 | } |
350 | |
351 | #if defined(__arm64__) |
352 | static void arm_prepare_u64_syscall_return(const struct sysent *, arm_saved_state_t *, uthread_t, int); |
353 | static int arm_get_u64_syscall_args(uthread_t, arm_saved_state64_t *, const struct sysent *); |
354 | |
355 | static int |
356 | arm_get_syscall_args(uthread_t uthread, struct arm_saved_state *state, const struct sysent *callp) |
357 | { |
358 | if (is_saved_state32(iss: state)) { |
359 | return arm_get_u32_syscall_args(uthread, saved_state32(iss: state), callp); |
360 | } else { |
361 | return arm_get_u64_syscall_args(uthread, saved_state64(iss: state), callp); |
362 | } |
363 | } |
364 | |
365 | /* |
366 | * 64-bit: all arguments in registers. We're willing to use x9, a temporary |
367 | * register per the ABI, to pass an argument to the kernel for one case, |
368 | * an indirect syscall with 8 arguments. No munging required, as all arguments |
369 | * are in 64-bit wide registers already. |
370 | */ |
371 | static int |
372 | arm_get_u64_syscall_args(uthread_t uthread, arm_saved_state64_t *regs, const struct sysent *callp) |
373 | { |
374 | int indirect_offset; |
375 | |
376 | #if CONFIG_REQUIRES_U32_MUNGING |
377 | sy_munge_t *mungerp; |
378 | #endif |
379 | |
380 | indirect_offset = (regs->x[ARM64_SYSCALL_CODE_REG_NUM] == 0) ? 1 : 0; |
381 | |
382 | /* |
383 | * Everything should fit in registers for now. |
384 | */ |
385 | if (callp->sy_narg > (int)(sizeof(uthread->uu_arg) / sizeof(uthread->uu_arg[0]))) { |
386 | return -1; |
387 | } |
388 | |
389 | memcpy(dst: &uthread->uu_arg[0], src: ®s->x[indirect_offset], n: callp->sy_narg * sizeof(uint64_t)); |
390 | |
391 | #if CONFIG_REQUIRES_U32_MUNGING |
392 | /* |
393 | * The indirect system call interface is vararg based. For armv7k, arm64_32, |
394 | * and arm64, this means we simply lay the values down on the stack, padded to |
395 | * a width multiple (4 bytes for armv7k and arm64_32, 8 bytes for arm64). |
396 | * The arm64(_32) stub for syscall will load this data into the registers and |
397 | * then trap. This gives us register state that corresponds to what we would |
398 | * expect from a armv7 task, so in this particular case we need to munge the |
399 | * arguments. |
400 | * |
401 | * TODO: Is there a cleaner way to do this check? What we're actually |
402 | * interested in is whether the task is arm64_32. We don't appear to guarantee |
403 | * that uu_proc is populated here, which is why this currently uses the |
404 | * thread_t. |
405 | */ |
406 | mungerp = callp->sy_arg_munge32; |
407 | |
408 | if (indirect_offset && !ml_thread_is64bit(thread: get_machthread(uthread))) { |
409 | (*mungerp)(&uthread->uu_arg[0]); |
410 | } |
411 | #endif |
412 | |
413 | return 0; |
414 | } |
415 | /* |
416 | * When the kernel is running AArch64, munge arguments from 32-bit |
417 | * userland out to 64-bit. |
418 | * |
419 | * flavor == 1 indicates an indirect syscall. |
420 | */ |
421 | static int |
422 | arm_get_u32_syscall_args(uthread_t uthread, arm_saved_state32_t *regs, const struct sysent *callp) |
423 | { |
424 | int regparams; |
425 | #if CONFIG_REQUIRES_U32_MUNGING |
426 | sy_munge_t *mungerp; |
427 | #else |
428 | #error U32 syscalls on ARM64 kernel requires munging |
429 | #endif |
430 | int flavor = (regs->save_r12 == 0 ? 1 : 0); |
431 | |
432 | regparams = (7 - flavor); /* Indirect value consumes a register */ |
433 | |
434 | assert((unsigned) callp->sy_arg_bytes <= sizeof(uthread->uu_arg)); |
435 | |
436 | if (callp->sy_arg_bytes <= (sizeof(uint32_t) * regparams)) { |
437 | /* |
438 | * Seven arguments or less are passed in registers. |
439 | */ |
440 | memcpy(dst: &uthread->uu_arg[0], src: ®s->r[flavor], n: callp->sy_arg_bytes); |
441 | } else if (callp->sy_arg_bytes <= sizeof(uthread->uu_arg)) { |
442 | /* |
443 | * In this case, we composite - take the first args from registers, |
444 | * the remainder from the stack (offset by the 7 regs therein). |
445 | */ |
446 | unix_syscall_kprintf("%s: spillover...\n" , __FUNCTION__); |
447 | memcpy(dst: &uthread->uu_arg[0], src: ®s->r[flavor], n: regparams * sizeof(int)); |
448 | if (copyin((user_addr_t)regs->sp + 7 * sizeof(int), (int *)&uthread->uu_arg[0] + regparams, |
449 | (callp->sy_arg_bytes - (sizeof(uint32_t) * regparams))) != 0) { |
450 | return -1; |
451 | } |
452 | } else { |
453 | return -1; |
454 | } |
455 | |
456 | #if CONFIG_REQUIRES_U32_MUNGING |
457 | /* Munge here */ |
458 | mungerp = callp->sy_arg_munge32; |
459 | if (mungerp != NULL) { |
460 | (*mungerp)(&uthread->uu_arg[0]); |
461 | } |
462 | #endif |
463 | |
464 | return 0; |
465 | } |
466 | |
467 | static unsigned short |
468 | arm_get_syscall_number(struct arm_saved_state *state) |
469 | { |
470 | if (is_saved_state32(iss: state)) { |
471 | if (saved_state32(iss: state)->save_r12 != 0) { |
472 | return (unsigned short)saved_state32(iss: state)->save_r12; |
473 | } else { |
474 | return (unsigned short)saved_state32(iss: state)->save_r0; |
475 | } |
476 | } else { |
477 | if (saved_state64(iss: state)->x[ARM64_SYSCALL_CODE_REG_NUM] != 0) { |
478 | return (unsigned short)saved_state64(iss: state)->x[ARM64_SYSCALL_CODE_REG_NUM]; |
479 | } else { |
480 | return (unsigned short)saved_state64(iss: state)->x[0]; |
481 | } |
482 | } |
483 | } |
484 | |
485 | static void |
486 | arm_prepare_syscall_return(const struct sysent *callp, struct arm_saved_state *state, uthread_t uthread, int error) |
487 | { |
488 | if (is_saved_state32(iss: state)) { |
489 | arm_prepare_u32_syscall_return(callp, regs: state, uthread, error); |
490 | } else { |
491 | arm_prepare_u64_syscall_return(callp, state, uthread, error); |
492 | } |
493 | } |
494 | |
495 | static void |
496 | arm_prepare_u64_syscall_return(const struct sysent *callp, arm_saved_state_t *regs, uthread_t uthread, int error) |
497 | { |
498 | assert(is_saved_state64(regs)); |
499 | |
500 | arm_saved_state64_t *ss64 = saved_state64(iss: regs); |
501 | |
502 | if (error == ERESTART) { |
503 | add_user_saved_state_pc(iss: regs, diff: -4); |
504 | } else if (error != EJUSTRETURN) { |
505 | if (error) { |
506 | ss64->x[0] = error; |
507 | ss64->x[1] = 0; |
508 | /* |
509 | * Set the carry bit to execute cerror routine. |
510 | * ARM64_TODO: should we have a separate definition? |
511 | * The bits are the same. |
512 | */ |
513 | ss64->cpsr |= PSR64_CF; |
514 | unix_syscall_return_kprintf("error: setting carry to trigger cerror call\n" ); |
515 | } else { /* (not error) */ |
516 | switch (callp->sy_return_type) { |
517 | case _SYSCALL_RET_INT_T: |
518 | ss64->x[0] = uthread->uu_rval[0]; |
519 | ss64->x[1] = uthread->uu_rval[1]; |
520 | break; |
521 | case _SYSCALL_RET_UINT_T: |
522 | ss64->x[0] = (u_int)uthread->uu_rval[0]; |
523 | ss64->x[1] = (u_int)uthread->uu_rval[1]; |
524 | break; |
525 | case _SYSCALL_RET_OFF_T: |
526 | case _SYSCALL_RET_ADDR_T: |
527 | case _SYSCALL_RET_SIZE_T: |
528 | case _SYSCALL_RET_SSIZE_T: |
529 | case _SYSCALL_RET_UINT64_T: |
530 | ss64->x[0] = *((uint64_t *)(&uthread->uu_rval[0])); |
531 | ss64->x[1] = 0; |
532 | break; |
533 | case _SYSCALL_RET_NONE: |
534 | break; |
535 | default: |
536 | panic("unix_syscall: unknown return type" ); |
537 | break; |
538 | } |
539 | } |
540 | } |
541 | /* else (error == EJUSTRETURN) { nothing } */ |
542 | } |
543 | static void |
544 | arm_trace_u64_unix_syscall(int code, arm_saved_state64_t *regs) |
545 | { |
546 | bool indirect = (regs->x[ARM64_SYSCALL_CODE_REG_NUM] == 0); |
547 | if (indirect) { |
548 | KDBG_RELEASE(BSDDBG_CODE(DBG_BSD_EXCP_SC, code) | DBG_FUNC_START, |
549 | regs->x[1], regs->x[2], regs->x[3], regs->x[4]); |
550 | } else { |
551 | KDBG_RELEASE(BSDDBG_CODE(DBG_BSD_EXCP_SC, code) | DBG_FUNC_START, |
552 | regs->x[0], regs->x[1], regs->x[2], regs->x[3]); |
553 | } |
554 | } |
555 | |
556 | static void |
557 | arm_trace_unix_syscall(int code, struct arm_saved_state *state) |
558 | { |
559 | if (is_saved_state32(iss: state)) { |
560 | arm_trace_u32_unix_syscall(code, regs: saved_state32(iss: state)); |
561 | } else { |
562 | arm_trace_u64_unix_syscall(code, regs: saved_state64(iss: state)); |
563 | } |
564 | } |
565 | |
566 | static void |
567 | arm_clear_u64_syscall_error(arm_saved_state64_t *regs) |
568 | { |
569 | regs->cpsr &= ~PSR64_CF; |
570 | } |
571 | |
572 | static void |
573 | arm_clear_syscall_error(struct arm_saved_state * state) |
574 | { |
575 | if (is_saved_state32(iss: state)) { |
576 | arm_clear_u32_syscall_error(regs: saved_state32(iss: state)); |
577 | } else { |
578 | arm_clear_u64_syscall_error(regs: saved_state64(iss: state)); |
579 | } |
580 | } |
581 | |
582 | #else |
583 | #error Unknown architecture. |
584 | #endif |
585 | |