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Cider Isn't Darwin Emulation, Really
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C
at android
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License (the "License"). * You may not use this file except in compliance with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at usr/src/OPENSOLARIS.LICENSE. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END */
/* * Copyright 2008 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */
#ifndef _FASTTRAP_IMPL_H#define _FASTTRAP_IMPL_H
/* * #pragma ident "@(#)fasttrap_impl.h 1.14 08/04/09 SMI" */
#include <sys/types.h>#include <sys/dtrace.h>#include <sys/proc.h>#include <sys/user.h>#include <sys/fasttrap.h>#include <sys/fasttrap_isa.h>
/* Solaris proc_t is the struct. Darwin's proc_t is a pointer to it. */#define proc_t struct proc /* Steer clear of the Darwin typedef for proc_t */
#ifdef __cplusplusextern "C" {#endif
/* * Fasttrap Providers, Probes and Tracepoints * * Each Solaris process can have multiple providers -- the pid provider as * well as any number of user-level statically defined tracing (USDT) * providers. Those providers are each represented by a fasttrap_provider_t. * All providers for a given process have a pointer to a shared * fasttrap_proc_t. The fasttrap_proc_t has two states: active or defunct. * When the count of active providers goes to zero it becomes defunct; a * provider drops its active count when it is removed individually or as part * of a mass removal when a process exits or performs an exec. * * Each probe is represented by a fasttrap_probe_t which has a pointer to * its associated provider as well as a list of fasttrap_id_tp_t structures * which are tuples combining a fasttrap_id_t and a fasttrap_tracepoint_t. * A fasttrap_tracepoint_t represents the actual point of instrumentation * and it contains two lists of fasttrap_id_t structures (to be fired pre- * and post-instruction emulation) that identify the probes attached to the * tracepoint. Tracepoints also have a pointer to the fasttrap_proc_t for the * process they trace which is used when looking up a tracepoint both when a * probe fires and when enabling and disabling probes. * * It's important to note that probes are preallocated with the necessary * number of tracepoints, but that tracepoints can be shared by probes and * swapped between probes. If a probe's preallocated tracepoint is enabled * (and, therefore, the associated probe is enabled), and that probe is * then disabled, ownership of that tracepoint may be exchanged for an * unused tracepoint belonging to another probe that was attached to the * enabled tracepoint. */
/* * APPLE NOTE: All kmutex_t's have been converted to lck_mtx_t */
typedef struct fasttrap_proc { pid_t ftpc_pid; /* process ID for this proc */ uint64_t ftpc_acount; /* count of active providers */ uint64_t ftpc_rcount; /* count of extant providers */ lck_mtx_t ftpc_mtx; /* lock on all but acount */ struct fasttrap_proc *ftpc_next; /* next proc in hash chain */} fasttrap_proc_t;
typedef struct fasttrap_provider { pid_t ftp_pid; /* process ID for this prov */ fasttrap_provider_type_t ftp_provider_type; /* type of this provider (usdt, pid, objc, oneshot) */ char ftp_name[DTRACE_PROVNAMELEN]; /* prov name (w/o the pid) */ dtrace_provider_id_t ftp_provid; /* DTrace provider handle */ uint_t ftp_marked; /* mark for possible removal */ uint_t ftp_retired; /* mark when retired */ lck_mtx_t ftp_mtx; /* provider lock */ lck_mtx_t ftp_cmtx; /* lock on creating probes */ uint64_t ftp_rcount; /* enabled probes ref count */ uint64_t ftp_ccount; /* consumers creating probes */ uint64_t ftp_mcount; /* meta provider count */ fasttrap_proc_t *ftp_proc; /* shared proc for all provs */ struct fasttrap_provider *ftp_next; /* next prov in hash chain */} fasttrap_provider_t;
typedef struct fasttrap_id fasttrap_id_t;typedef struct fasttrap_probe fasttrap_probe_t;typedef struct fasttrap_tracepoint fasttrap_tracepoint_t;
struct fasttrap_id { fasttrap_probe_t *fti_probe; /* referrring probe */ fasttrap_id_t *fti_next; /* enabled probe list on tp */ fasttrap_probe_type_t fti_ptype; /* probe type */};
typedef struct fasttrap_id_tp { fasttrap_id_t fit_id; fasttrap_tracepoint_t *fit_tp;} fasttrap_id_tp_t;
struct fasttrap_probe { dtrace_id_t ftp_id; /* DTrace probe identifier */ pid_t ftp_pid; /* pid for this probe */ fasttrap_provider_t *ftp_prov; /* this probe's provider */ user_addr_t ftp_faddr; /* associated function's addr */ size_t ftp_fsize; /* associated function's size */ uint64_t ftp_gen; /* modification generation */ uint64_t ftp_ntps; /* number of tracepoints */ uint8_t *ftp_argmap; /* native to translated args */ uint8_t ftp_nargs; /* translated argument count */ uint8_t ftp_enabled; /* is this probe enabled */ char *ftp_xtypes; /* translated types index */ char *ftp_ntypes; /* native types index */ fasttrap_id_tp_t ftp_tps[1]; /* flexible array */};
#define FASTTRAP_ID_INDEX(id) \((fasttrap_id_tp_t *)(((char *)(id) - offsetof(fasttrap_id_tp_t, fit_id))) - \&(id)->fti_probe->ftp_tps[0])
struct fasttrap_tracepoint { fasttrap_proc_t *ftt_proc; /* associated process struct */ user_addr_t ftt_pc; /* address of tracepoint */ pid_t ftt_pid; /* pid of tracepoint */ fasttrap_machtp_t ftt_mtp; /* ISA-specific portion */ fasttrap_id_t *ftt_ids; /* NULL-terminated list */ fasttrap_id_t *ftt_retids; /* NULL-terminated list */ fasttrap_tracepoint_t *ftt_next; /* link in global hash */};
typedef struct fasttrap_bucket { lck_mtx_t ftb_mtx; /* bucket lock */ void *ftb_data; /* data payload */
uint8_t ftb_pad[64 - sizeof (lck_mtx_t) - sizeof (void *)];} fasttrap_bucket_t;
typedef struct fasttrap_hash { ulong_t fth_nent; /* power-of-2 num. of entries */ ulong_t fth_mask; /* fth_nent - 1 */ fasttrap_bucket_t *fth_table; /* array of buckets */} fasttrap_hash_t;
/* * If at some future point these assembly functions become observable by * DTrace, then these defines should become separate functions so that the * fasttrap provider doesn't trigger probes during internal operations. */#define fasttrap_copyout copyout#define fasttrap_fuword32 fuword32#define fasttrap_suword32 suword32
#if defined __APPLE__/* * xnu runs in 32 bit mode even when supporting 64 bit processes. We need * to make size explicit. */#define fasttrap_fuword64 fuword64#define fasttrap_suword64 suword64#define fasttrap_fuword64_noerr fuword64_noerr#define fasttrap_fuword32_noerr fuword32_noerr#else#define fasttrap_fulword fulword#define fasttrap_sulword sulword#endif
extern void fasttrap_sigtrap(proc_t *, uthread_t, user_addr_t);
extern dtrace_id_t fasttrap_probe_id;extern fasttrap_hash_t fasttrap_tpoints;
#define FASTTRAP_TPOINTS_INDEX(pid, pc) \ (((pc) / sizeof (fasttrap_instr_t) + (pid)) & fasttrap_tpoints.fth_mask)
/* * Must be implemented by fasttrap_isa.c */extern int fasttrap_tracepoint_init(proc_t *, fasttrap_tracepoint_t *, user_addr_t, fasttrap_probe_type_t);extern int fasttrap_tracepoint_install(proc_t *, fasttrap_tracepoint_t *);extern int fasttrap_tracepoint_remove(proc_t *, fasttrap_tracepoint_t *);
#if defined (__i386__) || defined(__x86_64__)extern int fasttrap_pid_probe(x86_saved_state_t *regs);extern int fasttrap_return_probe(x86_saved_state_t* regs);#else#error architecture not supported#endif
extern uint64_t fasttrap_pid_getarg(void *, dtrace_id_t, void *, int, int);extern uint64_t fasttrap_usdt_getarg(void *, dtrace_id_t, void *, int, int);
#ifdef __cplusplus}#endif
#undef proc_t
#endif /* _FASTTRAP_IMPL_H */