bsd/sys/dtrace_glue.h

   1 /*
   2  * Copyright (c) 2005-2006 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28
  29 #ifndef _DTRACE_GLUE_H
  30 #define _DTRACE_GLUE_H
  31
  32 #ifdef KERNEL_BUILD
  33
  34 #include <libkern/libkern.h>
  35 #include <kern/lock.h>
  36 #include <kern/locks.h>
  37 #include <kern/thread_call.h>
  38 #include <kern/thread.h>
  39 #include <machine/machine_routines.h>
  40 #include <sys/syslog.h>
  41 #include <sys/ucred.h>
  42 #include <stdarg.h>
  43 #include <mach/kmod.h>
  44 #include <libkern/OSAtomic.h>
  45
  46 #if defined(__i386__) || defined(__x86_64__)
  47 #include <i386/mp.h>
  48 #endif
  49
  50 /*
  51  * cmn_err
  52  */
  53 #define CE_CONT         0       /* continuation         */
  54 #define CE_NOTE         1       /* notice               */
  55 #define CE_WARN         2       /* warning              */
  56 #define CE_PANIC        3       /* panic                */
  57 #define CE_IGNORE       4       /* print nothing        */
  58
  59 extern void cmn_err( int, const char *, ... );
  60
  61 /*
  62  * pid/proc
  63  */
  64
  65 /* Solaris proc_t is the struct. Darwin's proc_t is a pointer to it. */
  66 #define proc_t struct proc /* Steer clear of the Darwin typedef for proc_t */
  67 #define curproc ((struct proc *)current_proc()) /* Called from probe context, must blacklist */
  68
  69 proc_t* sprlock(pid_t pid);
  70 void sprunlock(proc_t *p);
  71
  72 /*
  73  * uread/uwrite
  74  */
  75
  76 int uread(proc_t *p, void *buf, user_size_t len, user_addr_t a);
  77 int uwrite(proc_t *p, void *buf, user_size_t len, user_addr_t a);
  78
  79 /*
  80  * fuword / suword
  81  */
  82
  83 int fuword8(user_addr_t, uint8_t *);
  84 int fuword16(user_addr_t, uint16_t *);
  85 int fuword32(user_addr_t, uint32_t *);
  86 int fuword64(user_addr_t, uint64_t *);
  87
  88 void fuword8_noerr(user_addr_t, uint8_t *);
  89 void fuword16_noerr(user_addr_t, uint16_t *);
  90 void fuword32_noerr(user_addr_t, uint32_t *);
  91 void fuword64_noerr(user_addr_t, uint64_t *);
  92
  93 int suword64(user_addr_t, uint64_t value);
  94 int suword32(user_addr_t, uint32_t value);
  95 int suword16(user_addr_t, uint16_t value);
  96 int suword8(user_addr_t, uint8_t value);
  97
  98 /*
  99  * cpuvar
 100  */
 101 extern lck_mtx_t cpu_lock;
 102 extern lck_mtx_t mod_lock;
 103
 104 /*
 105  * Per-CPU data.
 106  */
 107 typedef struct dtrace_cpu {
 108         processorid_t   cpu_id;                    /* CPU number */
 109         struct dtrace_cpu *cpu_next;                 /* next existing CPU */
 110         lck_rw_t        cpu_ft_lock;               /* DTrace: fasttrap lock */
 111         uintptr_t       cpu_dtrace_caller;         /* DTrace: caller, if any */
 112         hrtime_t        cpu_dtrace_chillmark;      /* DTrace: chill mark time */
 113         hrtime_t        cpu_dtrace_chilled;        /* DTrace: total chill time */
 114         boolean_t       cpu_dtrace_invop_underway; /* DTrace gaurds against invalid op re-entrancy */
 115 } dtrace_cpu_t;
 116
 117 extern dtrace_cpu_t *cpu_list;
 118
 119 /*
 120  * The cpu_core structure consists of per-CPU state available in any context.
 121  * On some architectures, this may mean that the page(s) containing the
 122  * NCPU-sized array of cpu_core structures must be locked in the TLB -- it
 123  * is up to the platform to assure that this is performed properly.  Note that
 124  * the structure is sized to avoid false sharing.
 125  */
 126 #define CPU_CACHE_COHERENCE_SIZE        64
 127
 128 typedef struct cpu_core {
 129         uint64_t        cpuc_dtrace_illval;     /* DTrace illegal value */
 130         lck_mtx_t       cpuc_pid_lock;          /* DTrace pid provider lock */
 131         uint16_t        cpuc_dtrace_flags;      /* DTrace flags */
 132         uint64_t        cpuc_missing_tos;       /* Addr. of top most stack frame if missing */
 133         uint8_t         cpuc_pad[CPU_CACHE_COHERENCE_SIZE - sizeof(uint64_t) - sizeof(lck_mtx_t) - sizeof(uint16_t) - sizeof(uint64_t) ];       /* padding */
 134 } cpu_core_t;
 135
 136 extern cpu_core_t *cpu_core;
 137
 138
 139 extern int cpu_number(void); /* From #include <kern/cpu_number.h>. Called from probe context, must blacklist. */
 140
 141 #define CPU             (&(cpu_list[cpu_number()]))     /* Pointer to current CPU */
 142 #define CPU_ON_INTR(cpup) ml_at_interrupt_context() /* always invoked on current cpu */
 143 #define NCPU    real_ncpus
 144
 145 /*
 146  * Routines used to register interest in cpu's being added to or removed
 147  * from the system.
 148  */
 149 typedef enum {
 150         CPU_INIT,
 151         CPU_CONFIG,
 152         CPU_UNCONFIG,
 153         CPU_ON,
 154         CPU_OFF,
 155         CPU_CPUPART_IN,
 156         CPU_CPUPART_OUT
 157 } cpu_setup_t;
 158
 159 typedef int cpu_setup_func_t(cpu_setup_t, int, void *);
 160
 161 extern void register_cpu_setup_func(cpu_setup_func_t *, void *);
 162 extern void unregister_cpu_setup_func(cpu_setup_func_t *, void *);
 163
 164 /*
 165  * CPU_DTRACE
 166  */
 167
 168 /*
 169  * DTrace flags.
 170  */
 171 #define CPU_DTRACE_NOFAULT      0x0001  /* Don't fault */
 172 #define CPU_DTRACE_DROP         0x0002  /* Drop this ECB */
 173 #define CPU_DTRACE_BADADDR      0x0004  /* DTrace fault: bad address */
 174 #define CPU_DTRACE_BADALIGN     0x0008  /* DTrace fault: bad alignment */
 175 #define CPU_DTRACE_DIVZERO      0x0010  /* DTrace fault: divide by zero */
 176 #define CPU_DTRACE_ILLOP        0x0020  /* DTrace fault: illegal operation */
 177 #define CPU_DTRACE_NOSCRATCH    0x0040  /* DTrace fault: out of scratch */
 178 #define CPU_DTRACE_KPRIV        0x0080  /* DTrace fault: bad kernel access */
 179 #define CPU_DTRACE_UPRIV        0x0100  /* DTrace fault: bad user access */
 180 #define CPU_DTRACE_TUPOFLOW     0x0200  /* DTrace fault: tuple stack overflow */
 181 #if defined(__sparc)
 182 //#define       CPU_DTRACE_FAKERESTORE  0x0400  /* pid provider hint to getreg */
 183 #endif
 184 #define CPU_DTRACE_USTACK_FP    0x0400  /* pid provider hint to ustack() */
 185 #define CPU_DTRACE_ENTRY        0x0800  /* pid provider hint to ustack() */
 186 #define CPU_DTRACE_BADSTACK 0x1000  /* DTrace fault: bad stack */
 187
 188 #define CPU_DTRACE_FAULT        (CPU_DTRACE_BADADDR | CPU_DTRACE_BADALIGN | \
 189                                 CPU_DTRACE_DIVZERO | CPU_DTRACE_ILLOP | \
 190                                 CPU_DTRACE_NOSCRATCH | CPU_DTRACE_KPRIV | \
 191                                 CPU_DTRACE_UPRIV | CPU_DTRACE_TUPOFLOW | \
 192                                 CPU_DTRACE_BADSTACK)
 193 #define CPU_DTRACE_ERROR        (CPU_DTRACE_FAULT | CPU_DTRACE_DROP)
 194
 195 /*
 196  * Loadable Modules
 197  */
 198
 199 /* Keep the compiler happy */
 200 struct dtrace_module_symbols;
 201
 202 /* Solaris' modctl structure, greatly simplified, shadowing parts of xnu kmod structure. */
 203 typedef struct modctl {
 204         struct modctl   *mod_next;
 205         struct modctl   *mod_stale;     // stale module chain
 206         uint32_t        mod_id;         // the kext unique identifier
 207         char            mod_modname[KMOD_MAX_NAME];
 208         int             mod_loadcnt;
 209         char            mod_loaded;
 210         char            mod_flags;      // See flags below
 211         int             mod_nenabled;   // # of enabled DTrace probes in module
 212         vm_address_t    mod_address;    // starting address (of Mach-o header blob)
 213         vm_size_t       mod_size;       // total size (of blob)
 214         UUID            mod_uuid;
 215         struct dtrace_module_symbols* mod_user_symbols;
 216 } modctl_t;
 217
 218 /* Definitions for mod_flags */
 219 #define MODCTL_IS_MACH_KERNEL                   0x01 // This module represents /mach_kernel
 220 #define MODCTL_HAS_KERNEL_SYMBOLS               0x02 // Kernel symbols (nlist) are available
 221 #define MODCTL_FBT_PROBES_PROVIDED              0x04 // fbt probes have been provided
 222 #define MODCTL_FBT_INVALID                      0x08 // Module is invalid for fbt probes
 223 #define MODCTL_SDT_PROBES_PROVIDED              0x10 // sdt probes have been provided
 224 #define MODCTL_SDT_INVALID                      0x20 // Module is invalid for sdt probes
 225 #define MODCTL_HAS_UUID                         0x40 // Module has UUID
 226
 227 /* Simple/singular mod_flags accessors */
 228 #define MOD_IS_MACH_KERNEL(mod)                 (mod->mod_flags & MODCTL_IS_MACH_KERNEL)
 229 #define MOD_HAS_KERNEL_SYMBOLS(mod)             (mod->mod_flags & MODCTL_HAS_KERNEL_SYMBOLS)
 230 #define MOD_HAS_USERSPACE_SYMBOLS(mod)          (mod->mod_user_symbols) /* No point in duplicating state in the flags bits */
 231 #define MOD_FBT_PROBES_PROVIDED(mod)            (mod->mod_flags & MODCTL_FBT_PROBES_PROVIDED)
 232 #define MOD_FBT_INVALID(mod)                    (mod->mod_flags & MODCTL_FBT_INVALID)
 233 #define MOD_SDT_PROBES_PROVIDED(mod)            (mod->mod_flags & MODCTL_SDT_PROBES_PROVIDED)
 234 #define MOD_SDT_INVALID(mod)                    (mod->mod_flags & MODCTL_SDT_INVALID)
 235 #define MOD_HAS_UUID(mod)                       (mod->mod_flags & MODCTL_HAS_UUID)
 236
 237 /* Compound accessors */
 238 #define MOD_FBT_DONE(mod)                       (MOD_FBT_PROBES_PROVIDED(mod) || MOD_FBT_INVALID(mod))
 239 #define MOD_SDT_DONE(mod)                       (MOD_SDT_PROBES_PROVIDED(mod) || MOD_SDT_INVALID(mod))
 240 #define MOD_SYMBOLS_DONE(mod)                   (MOD_FBT_DONE(mod) && MOD_SDT_DONE(mod))
 241
 242 extern modctl_t *dtrace_modctl_list;
 243
 244 /*
 245  * cred_t
 246  */
 247 /* Privileges */
 248 #define PRIV_DTRACE_KERNEL        3
 249 #define PRIV_DTRACE_PROC          4
 250 #define PRIV_DTRACE_USER          5
 251 #define PRIV_PROC_OWNER          30
 252 #define PRIV_PROC_ZONE           35
 253 #define PRIV_ALL                        (-1)    /* All privileges required */
 254
 255 /* Privilege sets */
 256 #define PRIV_EFFECTIVE            0
 257
 258 typedef struct ucred cred_t;
 259 #define cr_suid cr_svuid
 260 #define cr_sgid cr_svgid
 261
 262 extern cred_t *dtrace_CRED(void); /* Safe to call from probe context. */
 263 #define CRED() kauth_cred_get() /* Can't be called from probe context! */
 264 extern int PRIV_POLICY_CHOICE(void *, int, int);
 265 extern int PRIV_POLICY_ONLY(void *, int, int);
 266 extern gid_t crgetgid(const cred_t *);
 267 extern uid_t crgetuid(const cred_t *);
 268 #define crgetzoneid(x) ((zoneid_t)0)
 269
 270 #define crhold(a) {}
 271 #define crfree(a) {}
 272
 273 /*
 274  * "cyclic"
 275  */
 276 #define CY_LOW_LEVEL            0
 277 #define CY_LOCK_LEVEL           1
 278 #define CY_HIGH_LEVEL           2
 279 #define CY_SOFT_LEVELS          2
 280 #define CY_LEVELS                       3
 281
 282 typedef uintptr_t cyclic_id_t;
 283 typedef cyclic_id_t *cyclic_id_list_t;
 284 typedef uint16_t cyc_level_t;
 285 typedef void (*cyc_func_t)(void *);
 286
 287 #define CYCLIC_NONE             ((cyclic_id_t)0)
 288
 289 typedef struct cyc_time {
 290         hrtime_t cyt_when;
 291         hrtime_t cyt_interval;
 292 } cyc_time_t;
 293
 294 typedef struct cyc_handler {
 295         cyc_func_t cyh_func;
 296         void *cyh_arg;
 297         cyc_level_t cyh_level;
 298 } cyc_handler_t;
 299
 300 typedef struct cyc_omni_handler {
 301         void (*cyo_online)(void *, dtrace_cpu_t *, cyc_handler_t *, cyc_time_t *);
 302         void (*cyo_offline)(void *, dtrace_cpu_t *, void *);
 303         void *cyo_arg;
 304 } cyc_omni_handler_t;
 305
 306 extern cyclic_id_t cyclic_add(cyc_handler_t *, cyc_time_t *);
 307 extern void cyclic_remove(cyclic_id_t);
 308
 309 extern cyclic_id_list_t cyclic_add_omni(cyc_omni_handler_t *);
 310 extern void cyclic_remove_omni(cyclic_id_list_t);
 311
 312 extern cyclic_id_t cyclic_timer_add(cyc_handler_t *, cyc_time_t *);
 313 extern void cyclic_timer_remove(cyclic_id_t);
 314
 315 /*
 316  * timeout / untimeout (converted to dtrace_timeout / dtrace_untimeout due to name collision)
 317  */
 318
 319 thread_call_t dtrace_timeout(void (*func)(void *, void *), void* arg, uint64_t nanos);
 320
 321 /*
 322  * ddi
 323  */
 324
 325 #define DDI_SUCCESS                     0
 326 #define DDI_FAILURE                     -1
 327
 328 #define DDI_DEV_T_NONE  ((dev_t)-1)
 329 #define DDI_DEV_T_ANY   ((dev_t)-2)
 330 #define DDI_MAJOR_T_UNKNOWN     ((major_t)0)
 331
 332 #define DDI_PSEUDO "ddi_pseudo"
 333
 334 typedef enum {
 335         DDI_ATTACH = 0,
 336         DDI_RESUME = 1,
 337         DDI_PM_RESUME = 2
 338 } ddi_attach_cmd_t;
 339
 340 typedef enum {
 341         DDI_DETACH = 0,
 342         DDI_SUSPEND = 1,
 343         DDI_PM_SUSPEND = 2,
 344         DDI_HOTPLUG_DETACH = 3          /* detach, don't try to auto-unconfig */
 345 } ddi_detach_cmd_t;
 346
 347 #define DDI_PROP_SUCCESS        0
 348
 349 #define DDI_PROP_DONTPASS   1
 350 typedef uint_t major_t;
 351 typedef uint_t minor_t;
 352
 353 typedef struct __dev_info *dev_info_t;
 354
 355 extern void ddi_report_dev(dev_info_t *);
 356 extern int ddi_soft_state_init(void **, size_t, size_t);
 357 extern void *ddi_get_soft_state(void *, int);
 358 extern int ddi_soft_state_free(void *, int);
 359 extern int ddi_soft_state_zalloc(void *, int);
 360 extern void ddi_soft_state_fini(void **);
 361
 362 int ddi_getprop(dev_t dev, dev_info_t *dip, int flags, const char *name, int defvalue);
 363
 364 extern int ddi_prop_free(void *);
 365 extern int ddi_prop_lookup_int_array(dev_t, dev_info_t *, uint_t, const char *, int **, uint_t *);
 366
 367 extern int ddi_driver_major(dev_info_t *);
 368
 369 extern int ddi_create_minor_node(dev_info_t *, const char *, int, minor_t, const char *, int);
 370 extern void ddi_remove_minor_node(dev_info_t *, char *);
 371
 372 extern major_t getemajor(dev_t);
 373 extern minor_t getminor(dev_t);
 374
 375 extern dev_t makedevice(major_t, minor_t);
 376
 377 /*
 378  * Kernel Debug Interface
 379  */
 380
 381 typedef enum kdi_dtrace_set {
 382         KDI_DTSET_DTRACE_ACTIVATE,
 383         KDI_DTSET_DTRACE_DEACTIVATE,
 384         KDI_DTSET_KMDB_BPT_ACTIVATE,
 385         KDI_DTSET_KMDB_BPT_DEACTIVATE
 386 } kdi_dtrace_set_t;
 387
 388 extern int kdi_dtrace_set(kdi_dtrace_set_t);
 389 extern void debug_enter(char *);
 390
 391 /*
 392  * DTrace specific zone allocation
 393  */
 394
 395 /*
 396  * To break dtrace memory usage out in a trackable
 397  * fashion, uncomment the #define below. This will
 398  * enable emulation of the general kalloc.XXX zones
 399  * for most dtrace allocations. (kalloc.large is not
 400  * emulated)
 401  *
 402  * #define DTRACE_MEMORY_ZONES 1
 403  *
 404  */
 405
 406 #if defined(DTRACE_MEMORY_ZONES)
 407 void dtrace_alloc_init(void);
 408 void *dtrace_alloc(vm_size_t);
 409 void dtrace_free(void *, vm_size_t);
 410 #endif
 411
 412 /*
 413  * kmem
 414  */
 415
 416 #define KM_SLEEP        0x00000000
 417 #define KM_NOSLEEP      0x00000001
 418
 419 typedef struct vmem vmem_t;
 420 typedef struct kmem_cache kmem_cache_t;
 421
 422 #define kmem_alloc dt_kmem_alloc /* Avoid clash with Darwin's kmem_alloc */
 423 #define kmem_free dt_kmem_free /* Avoid clash with Darwin's kmem_free */
 424 #define kmem_zalloc dt_kmem_zalloc /* Avoid clash with Darwin's kmem_zalloc */
 425 extern void *dt_kmem_alloc(size_t, int);
 426 extern void dt_kmem_free(void *, size_t);
 427 extern void *dt_kmem_zalloc(size_t, int);
 428
 429 extern void *dt_kmem_alloc_aligned(size_t, size_t, int);
 430 extern void *dt_kmem_zalloc_aligned(size_t, size_t, int);
 431 extern void dt_kmem_free_aligned(void*, size_t);
 432
 433 extern kmem_cache_t *
 434 kmem_cache_create(const char *, size_t, size_t, int (*)(void *, void *, int),
 435         void (*)(void *, void *), void (*)(void *), void *, vmem_t *, int);
 436 extern void *kmem_cache_alloc(kmem_cache_t *, int);
 437 extern void kmem_cache_free(kmem_cache_t *, void *);
 438 extern void kmem_cache_destroy(kmem_cache_t *);
 439
 440 /*
 441  * kthread
 442  */
 443
 444 typedef struct _kthread kthread_t; /* For dtrace_vtime_switch(), dtrace_panicked and dtrace_errthread */
 445
 446 /*
 447  * proc
 448  */
 449
 450 #define DATAMODEL_MASK  0x0FF00000
 451
 452 #define DATAMODEL_ILP32 0x00100000
 453 #define DATAMODEL_LP64  0x00200000
 454
 455 #define DATAMODEL_NONE  0
 456
 457 #if     defined(__LP64__)
 458 #define DATAMODEL_NATIVE        DATAMODEL_LP64
 459 #else
 460 #define DATAMODEL_NATIVE        DATAMODEL_ILP32
 461 #endif  /* __LP64__ */
 462
 463 typedef unsigned int model_t; /* For dtrace_instr_size_isa() prototype in <sys/dtrace.h> */
 464
 465 /*
 466  * taskq
 467  */
 468
 469 #define TQ_SLEEP        0x00    /* Can block for memory */
 470
 471 typedef uint_t pri_t;
 472 typedef struct taskq taskq_t;
 473 typedef void (task_func_t)(void *);
 474 typedef uintptr_t taskqid_t;
 475
 476 extern taskq_t  *taskq_create(const char *, int, pri_t, int, int, uint_t);
 477 extern taskqid_t taskq_dispatch(taskq_t *, task_func_t, void *, uint_t);
 478 extern void     taskq_destroy(taskq_t *);
 479
 480 extern pri_t maxclsyspri;
 481
 482 /*
 483  * vmem
 484  */
 485
 486 #define VMC_IDENTIFIER  0x00040000      /* not backed by memory */
 487 #define VM_SLEEP        0x00000000      /* same as KM_SLEEP */
 488 #define VM_BESTFIT      0x00000100
 489
 490 extern void *vmem_alloc(vmem_t *, size_t, int);
 491 extern vmem_t *vmem_create(const char *, void *, size_t, size_t, void *,
 492                                         void *, vmem_t *, size_t, int);
 493 extern void vmem_destroy(vmem_t *);
 494 extern void vmem_free(vmem_t *vmp, void *vaddr, size_t size);
 495
 496 /*
 497  * Atomic
 498  */
 499
 500 static inline void atomic_add_32( uint32_t *theValue, int32_t theAmount )
 501 {
 502         (void)OSAddAtomic( theAmount, theValue );
 503 }
 504
 505 #if defined(__i386__) || defined(__x86_64__)
 506 static inline void atomic_add_64( uint64_t *theValue, int64_t theAmount )
 507 {
 508         (void)OSAddAtomic64( theAmount, (SInt64 *)theValue );
 509 }
 510 #endif
 511
 512 /*
 513  * Miscellaneous
 514  */
 515
 516 typedef uintptr_t pc_t;
 517 typedef uintptr_t greg_t; /* For dtrace_impl.h prototype of dtrace_getfp() */
 518 extern struct regs *find_user_regs( thread_t thread);
 519 extern vm_offset_t dtrace_get_cpu_int_stack_top(void);
 520 extern vm_offset_t max_valid_stack_address(void); /* kern/thread.h */
 521
 522 extern volatile int panicwait; /* kern/debug.c */
 523 #define panic_quiesce (panicwait)
 524
 525 #define IS_P2ALIGNED(v, a) ((((uintptr_t)(v)) & ((uintptr_t)(a) - 1)) == 0)
 526
 527 extern void delay( int ); /* kern/clock.h */
 528
 529 extern int vuprintf(const char *, va_list);
 530
 531 extern hrtime_t dtrace_abs_to_nano(uint64_t);
 532
 533 __private_extern__ const char * strstr(const char *, const char *);
 534
 535 #undef proc_t
 536
 537 /*
 538  * Safe counted string compare against a literal string. The sizeof() intentionally
 539  * counts the trailing NUL, and so ensures that all the characters in the literal
 540  * can participate in the comparison.
 541  */
 542 #define LIT_STRNEQL(s1, lit_s2) (0 == strncmp( (s1), (lit_s2), sizeof((lit_s2)) ))
 543
 544 /*
 545  * Safe counted string compare of a literal against the beginning of a string. Here
 546  * the sizeof() is reduced by 1 so that the trailing null of the literal does not
 547  * participate in the comparison.
 548  */
 549 #define LIT_STRNSTART(s1, lit_s2) (0 == strncmp( (s1), (lit_s2), sizeof((lit_s2)) - 1 ))
 550
 551 #define KERNELBASE VM_MIN_KERNEL_ADDRESS
 552 #endif /* KERNEL_BUILD */
 553 #endif /* _DTRACE_GLUE_H */
 554