X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/b0d623f7f2ae71ed96e60569f61f9a9a27016e80..04b8595b18b1b41ac7a206e4b3d51a635f8413d7:/bsd/dev/dtrace/systrace.c diff --git a/bsd/dev/dtrace/systrace.c b/bsd/dev/dtrace/systrace.c index 3a8382f15..c8a6305b1 100644 --- a/bsd/dev/dtrace/systrace.c +++ b/bsd/dev/dtrace/systrace.c @@ -19,41 +19,27 @@ * CDDL HEADER END */ /* - * Copyright 2006 Sun Microsystems, Inc. All rights reserved. + * Copyright 2009 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ /* #pragma ident "@(#)systrace.c 1.6 06/09/19 SMI" */ -#if !defined(__APPLE__) -#include -#include -#include -#include -#include -#include -#include -#include -#define SYSTRACE_ARTIFICIAL_FRAMES 1 -#else - #ifdef KERNEL #ifndef _KERNEL #define _KERNEL /* Solaris vs. Darwin */ #endif #endif -#define MACH__POSIX_C_SOURCE_PRIVATE 1 /* pulls in suitable savearea from mach/ppc/thread_status.h */ #include #include + /* XXX All of these should really be derived from syscall_sw.h */ -#if defined(__i386__) || defined (__x86_64__) +#if defined (__x86_64__) #define SYSCALL_CLASS_SHIFT 24 #define SYSCALL_CLASS_MASK (0xFF << SYSCALL_CLASS_SHIFT) #define SYSCALL_NUMBER_MASK (~SYSCALL_CLASS_MASK) #define I386_SYSCALL_NUMBER_MASK (0xFFFF) - -typedef x86_saved_state_t savearea_t; #endif #include @@ -73,10 +59,9 @@ typedef x86_saved_state_t savearea_t; #include #include -#if defined (__ppc__) || defined (__ppc64__) -#define SYSTRACE_ARTIFICIAL_FRAMES 3 -#define MACHTRACE_ARTIFICIAL_FRAMES 4 -#elif defined(__i386__) || defined (__x86_64__) +#include + +#if defined (__x86_64__) #define SYSTRACE_ARTIFICIAL_FRAMES 2 #define MACHTRACE_ARTIFICIAL_FRAMES 3 #else @@ -96,23 +81,26 @@ extern const char *syscallnames[]; #define LOADABLE_SYSCALL(a) 0 /* Not pertinent to Darwin. */ #define LOADED_SYSCALL(a) 1 /* Not pertinent to Darwin. */ +extern lck_attr_t* dtrace_lck_attr; +extern lck_grp_t* dtrace_lck_grp; +static lck_mtx_t dtrace_systrace_lock; /* probe state lock */ + systrace_sysent_t *systrace_sysent = NULL; -void (*systrace_probe)(dtrace_id_t, uint64_t, uint64_t, - uint64_t, uint64_t, uint64_t, uint64_t, uint64_t, uint64_t); +void (*systrace_probe)(dtrace_id_t, uint64_t, uint64_t, uint64_t, uint64_t, uint64_t); + +static uint64_t systrace_getarg(void *, dtrace_id_t, void *, int, int); void systrace_stub(dtrace_id_t id, uint64_t arg0, uint64_t arg1, - uint64_t arg2, uint64_t arg3, uint64_t arg4, uint64_t arg5, uint64_t arg6, uint64_t arg7) + uint64_t arg2, uint64_t arg3, uint64_t arg4) { -#pragma unused(id,arg0,arg1,arg2,arg3,arg4,arg5,arg6,arg7) +#pragma unused(id,arg0,arg1,arg2,arg3,arg4) } - int32_t dtrace_systrace_syscall(struct proc *pp, void *uap, int *rv) { - boolean_t flavor; - unsigned short code; + unsigned short code; /* The system call number */ systrace_sysent_t *sy; dtrace_id_t id; @@ -122,24 +110,9 @@ dtrace_systrace_syscall(struct proc *pp, void *uap, int *rv) #endif syscall_arg_t *ip = (syscall_arg_t *)uap; -#if defined (__ppc__) || defined (__ppc64__) - { - savearea_t *regs = (savearea_t *)find_user_regs(current_thread()); - - flavor = (((unsigned int)regs->save_r0) == 0)? 1: 0; - - if (flavor) - code = regs->save_r3; - else - code = regs->save_r0; - - /* - * FIXME: unix_syscall screens for "unsafe calls" and instead calls nosys(), *not* sysent[code] ! - */ - } -#elif defined(__i386__) || defined (__x86_64__) -#pragma unused(flavor) +#if defined (__x86_64__) { + pal_register_cache_state(current_thread(), VALID); x86_saved_state_t *tagged_regs = (x86_saved_state_t *)find_user_regs(current_thread()); if (is_saved_state64(tagged_regs)) { @@ -169,14 +142,22 @@ dtrace_systrace_syscall(struct proc *pp, void *uap, int *rv) sy = (code >= NUM_SYSENT) ? &systrace_sysent[63] : &systrace_sysent[code]; if ((id = sy->stsy_entry) != DTRACE_IDNONE) { + uthread_t uthread = (uthread_t)get_bsdthread_info(current_thread()); + if (uthread) + uthread->t_dtrace_syscall_args = (void *)ip; + if (ip) - (*systrace_probe)(id, *ip, *(ip+1), *(ip+2), *(ip+3), *(ip+4), *(ip+5), *(ip+6), *(ip+7)); + (*systrace_probe)(id, *ip, *(ip+1), *(ip+2), *(ip+3), *(ip+4)); else - (*systrace_probe)(id, 0, 0, 0, 0, 0, 0, 0, 0); + (*systrace_probe)(id, 0, 0, 0, 0, 0); + + if (uthread) + uthread->t_dtrace_syscall_args = (void *)0; } #if 0 /* XXX */ /* + * APPLE NOTE: Not implemented. * We want to explicitly allow DTrace consumers to stop a process * before it actually executes the meat of the syscall. */ @@ -219,6 +200,7 @@ dtrace_systrace_syscall(struct proc *pp, void *uap, int *rv) munged_rv1 = ((u_int)rv[1]); break; case _SYSCALL_RET_OFF_T: + case _SYSCALL_RET_UINT64_T: munged_rv0 = *(u_int64_t *)rv; munged_rv1 = 0LL; break; @@ -259,7 +241,7 @@ dtrace_systrace_syscall(struct proc *pp, void *uap, int *rv) * * This change was made 4/23/2003 according to the DTrace project's putback log." */ - (*systrace_probe)(id, munged_rv0, munged_rv0, munged_rv1, (uint64_t)rval, 0, 0, 0, 0); + (*systrace_probe)(id, munged_rv0, munged_rv0, munged_rv1, (uint64_t)rval, 0); } return (rval); @@ -302,6 +284,7 @@ dtrace_systrace_syscall_return(unsigned short code, int rval, int *rv) munged_rv1 = ((u_int)rv[1]); break; case _SYSCALL_RET_OFF_T: + case _SYSCALL_RET_UINT64_T: munged_rv0 = *(u_int64_t *)rv; munged_rv1 = 0LL; break; @@ -326,10 +309,9 @@ dtrace_systrace_syscall_return(unsigned short code, int rval, int *rv) munged_rv1 = 0LL; } - (*systrace_probe)(id, munged_rv0, munged_rv0, munged_rv1, (uint64_t)rval, 0, 0, 0, 0); + (*systrace_probe)(id, munged_rv0, munged_rv0, munged_rv1, (uint64_t)rval, 0); } } -#endif /* __APPLE__ */ #define SYSTRACE_SHIFT 16 #define SYSTRACE_ISENTRY(x) ((int)(x) >> SYSTRACE_SHIFT) @@ -344,38 +326,12 @@ dtrace_systrace_syscall_return(unsigned short code, int rval, int *rv) static dev_info_t *systrace_devi; static dtrace_provider_id_t systrace_id; -#if !defined (__APPLE__) -static void -systrace_init(struct sysent *actual, systrace_sysent_t **interposed) -{ - systrace_sysent_t *sysent = *interposed; - int i; - - if (sysent == NULL) { - *interposed = sysent = kmem_zalloc(sizeof (systrace_sysent_t) * - NSYSCALL, KM_SLEEP); - } - - for (i = 0; i < NSYSCALL; i++) { - struct sysent *a = &actual[i]; - systrace_sysent_t *s = &sysent[i]; - - if (LOADABLE_SYSCALL(a) && !LOADED_SYSCALL(a)) - continue; - - if (a->sy_callc == dtrace_systrace_syscall) - continue; - -#ifdef _SYSCALL32_IMPL - if (a->sy_callc == dtrace_systrace_syscall32) - continue; -#endif +/* + * APPLE NOTE: Avoid name clash with Darwin automagic conf symbol. + * See balanced undef below. + */ +#define systrace_init _systrace_init - s->stsy_underlying = a->sy_callc; - } -} -#else -#define systrace_init _systrace_init /* Avoid name clash with Darwin automagic conf symbol */ static void systrace_init(struct sysent *actual, systrace_sysent_t **interposed) { @@ -407,9 +363,9 @@ systrace_init(struct sysent *actual, systrace_sysent_t **interposed) s->stsy_underlying = a->sy_callc; s->stsy_return_type = a->sy_return_type; } + lck_mtx_init(&dtrace_systrace_lock, dtrace_lck_grp, dtrace_lck_attr); } -#endif /* __APPLE__ */ /*ARGSUSED*/ static void @@ -449,9 +405,7 @@ systrace_provide(void *arg, const dtrace_probedesc_t *desc) #endif } } -#if defined(__APPLE__) #undef systrace_init -#endif /*ARGSUSED*/ static void @@ -480,7 +434,7 @@ systrace_destroy(void *arg, dtrace_id_t id, void *parg) } /*ARGSUSED*/ -static void +static int systrace_enable(void *arg, dtrace_id_t id, void *parg) { #pragma unused(arg) /* __APPLE__ */ @@ -503,17 +457,21 @@ systrace_enable(void *arg, dtrace_id_t id, void *parg) if (enabled) { ASSERT(sysent[sysnum].sy_callc == dtrace_systrace_syscall); - return; + return(0); } - - (void) casptr(&sysent[sysnum].sy_callc, - (void *)systrace_sysent[sysnum].stsy_underlying, - (void *)dtrace_systrace_syscall); #ifdef _SYSCALL32_IMPL (void) casptr(&sysent32[sysnum].sy_callc, (void *)systrace_sysent32[sysnum].stsy_underlying, (void *)dtrace_systrace_syscall32); #endif + + lck_mtx_lock(&dtrace_systrace_lock); + if (sysent[sysnum].sy_callc == systrace_sysent[sysnum].stsy_underlying) { + vm_offset_t dss = (vm_offset_t)&dtrace_systrace_syscall; + ml_nofault_copy((vm_offset_t)&dss, (vm_offset_t)&sysent[sysnum].sy_callc, sizeof(vm_offset_t)); + } + lck_mtx_unlock(&dtrace_systrace_lock); + return (0); } /*ARGSUSED*/ @@ -527,9 +485,10 @@ systrace_disable(void *arg, dtrace_id_t id, void *parg) systrace_sysent[sysnum].stsy_return == DTRACE_IDNONE); if (disable) { - (void) casptr(&sysent[sysnum].sy_callc, - (void *)dtrace_systrace_syscall, - (void *)systrace_sysent[sysnum].stsy_underlying); + lck_mtx_lock(&dtrace_systrace_lock); + if (sysent[sysnum].sy_callc == dtrace_systrace_syscall) + ml_nofault_copy((vm_offset_t)&systrace_sysent[sysnum].stsy_underlying, (vm_offset_t)&sysent[sysnum].sy_callc, sizeof(systrace_sysent[sysnum].stsy_underlying)); + lck_mtx_unlock(&dtrace_systrace_lock); #ifdef _SYSCALL32_IMPL (void) casptr(&sysent32[sysnum].sy_callc, @@ -567,7 +526,7 @@ static dtrace_pops_t systrace_pops = { NULL, NULL, NULL, - NULL, + systrace_getarg, NULL, systrace_destroy }; @@ -584,19 +543,6 @@ systrace_attach(dev_info_t *devi, ddi_attach_cmd_t cmd) return (DDI_FAILURE); } -#if !defined(__APPLE__) - systrace_probe = (void (*)())dtrace_probe; - membar_enter(); - - if (ddi_create_minor_node(devi, "systrace", S_IFCHR, 0, - DDI_PSEUDO, NULL) == DDI_FAILURE || - dtrace_register("syscall", &systrace_attr, DTRACE_PRIV_USER, NULL, - &systrace_pops, NULL, &systrace_id) != 0) { - systrace_probe = systrace_stub; - ddi_remove_minor_node(devi, NULL); - return (DDI_FAILURE); - } -#else systrace_probe = (void(*))&dtrace_probe; membar_enter(); @@ -608,7 +554,6 @@ systrace_attach(dev_info_t *devi, ddi_attach_cmd_t cmd) ddi_remove_minor_node(devi, NULL); return (DDI_FAILURE); } -#endif /* __APPLE__ */ ddi_report_dev(devi); systrace_devi = devi; @@ -616,6 +561,10 @@ systrace_attach(dev_info_t *devi, ddi_attach_cmd_t cmd) return (DDI_SUCCESS); } + +/* + * APPLE NOTE: systrace_detach not implemented + */ #if !defined(__APPLE__) static int systrace_detach(dev_info_t *devi, ddi_detach_cmd_t cmd) @@ -636,122 +585,27 @@ systrace_detach(dev_info_t *devi, ddi_detach_cmd_t cmd) systrace_probe = systrace_stub; return (DDI_SUCCESS); } +#endif /* __APPLE__ */ -/*ARGSUSED*/ -static int -systrace_info(dev_info_t *dip, ddi_info_cmd_t infocmd, void *arg, void **result) -{ - int error; - - switch (infocmd) { - case DDI_INFO_DEVT2DEVINFO: - *result = (void *)systrace_devi; - error = DDI_SUCCESS; - break; - case DDI_INFO_DEVT2INSTANCE: - *result = (void *)0; - error = DDI_SUCCESS; - break; - default: - error = DDI_FAILURE; - } - return (error); -} - -/*ARGSUSED*/ -static int -systrace_open(dev_t *devp, int flag, int otyp, cred_t *cred_p) -{ - return (0); -} - -static struct cb_ops systrace_cb_ops = { - systrace_open, /* open */ - nodev, /* close */ - nulldev, /* strategy */ - nulldev, /* print */ - nodev, /* dump */ - nodev, /* read */ - nodev, /* write */ - nodev, /* ioctl */ - nodev, /* devmap */ - nodev, /* mmap */ - nodev, /* segmap */ - nochpoll, /* poll */ - ddi_prop_op, /* cb_prop_op */ - 0, /* streamtab */ - D_NEW | D_MP /* Driver compatibility flag */ -}; - -static struct dev_ops systrace_ops = { - DEVO_REV, /* devo_rev, */ - 0, /* refcnt */ - systrace_info, /* get_dev_info */ - nulldev, /* identify */ - nulldev, /* probe */ - systrace_attach, /* attach */ - systrace_detach, /* detach */ - nodev, /* reset */ - &systrace_cb_ops, /* driver operations */ - NULL, /* bus operations */ - nodev /* dev power */ -}; - -/* - * Module linkage information for the kernel. - */ -static struct modldrv modldrv = { - &mod_driverops, /* module type (this is a pseudo driver) */ - "System Call Tracing", /* name of module */ - &systrace_ops, /* driver ops */ -}; - -static struct modlinkage modlinkage = { - MODREV_1, - (void *)&modldrv, - NULL -}; - -int -_init(void) -{ - return (mod_install(&modlinkage)); -} - -int -_info(struct modinfo *modinfop) -{ - return (mod_info(&modlinkage, modinfop)); -} -int -_fini(void) -{ - return (mod_remove(&modlinkage)); -} -#else typedef kern_return_t (*mach_call_t)(void *); -/* XXX From #include which may be changed for 64 bit! */ -typedef void mach_munge_t(const void *, void *); +/* APPLE NOTE: From #include which may be changed for 64 bit! */ +typedef void mach_munge_t(void *); typedef struct { - int mach_trap_arg_count; - int (*mach_trap_function)(void); -#if defined(__i386__) - boolean_t mach_trap_stack; -#else - mach_munge_t *mach_trap_arg_munge32; /* system call arguments for 32-bit */ - mach_munge_t *mach_trap_arg_munge64; /* system call arguments for 64-bit */ + int mach_trap_arg_count; + kern_return_t (*mach_trap_function)(void *); +#if defined(__arm64__) || defined(__x86_64__) + mach_munge_t *mach_trap_arg_munge32; /* system call arguments for 32-bit */ #endif -#if !MACH_ASSERT - int mach_trap_unused; -#else - const char* mach_trap_name; -#endif /* !MACH_ASSERT */ + int mach_trap_u32_words; +#if MACH_ASSERT + const char* mach_trap_name; +#endif /* MACH_ASSERT */ } mach_trap_t; -extern mach_trap_t mach_trap_table[]; +extern const mach_trap_t mach_trap_table[]; /* syscall_sw.h now declares this as const */ extern int mach_trap_count; extern const char *mach_syscall_name_table[]; @@ -776,21 +630,27 @@ struct mach_call_args { #error 1 << SYSTRACE_SHIFT must exceed number of Mach traps #endif -typedef systrace_sysent_t machtrace_sysent_t; +typedef struct machtrace_sysent { + dtrace_id_t stsy_entry; + dtrace_id_t stsy_return; + kern_return_t (*stsy_underlying)(void *); + int32_t stsy_return_type; +} machtrace_sysent_t; static machtrace_sysent_t *machtrace_sysent = NULL; void (*machtrace_probe)(dtrace_id_t, uint64_t, uint64_t, uint64_t, uint64_t, uint64_t); +static uint64_t machtrace_getarg(void *, dtrace_id_t, void *, int, int); + static dev_info_t *machtrace_devi; static dtrace_provider_id_t machtrace_id; static kern_return_t dtrace_machtrace_syscall(struct mach_call_args *args) { - boolean_t flavor; - unsigned short code; + int code; /* The mach call number */ machtrace_sysent_t *sy; dtrace_id_t id; @@ -801,20 +661,9 @@ dtrace_machtrace_syscall(struct mach_call_args *args) syscall_arg_t *ip = (syscall_arg_t *)args; mach_call_t mach_call; -#if defined (__ppc__) || defined (__ppc64__) - { - savearea_t *regs = (savearea_t *)find_user_regs(current_thread()); - - flavor = (((unsigned int)regs->save_r0) == 0)? 1: 0; - - if (flavor) - code = -regs->save_r3; - else - code = -regs->save_r0; - } -#elif defined(__i386__) || defined (__x86_64__) -#pragma unused(flavor) +#if defined (__x86_64__) { + pal_register_cache_state(current_thread(), VALID); x86_saved_state_t *tagged_regs = (x86_saved_state_t *)find_user_regs(current_thread()); if (is_saved_state64(tagged_regs)) { @@ -829,11 +678,21 @@ dtrace_machtrace_syscall(struct mach_call_args *args) sy = &machtrace_sysent[code]; - if ((id = sy->stsy_entry) != DTRACE_IDNONE) + if ((id = sy->stsy_entry) != DTRACE_IDNONE) { + uthread_t uthread = (uthread_t)get_bsdthread_info(current_thread()); + + if (uthread) + uthread->t_dtrace_syscall_args = (void *)ip; + (*machtrace_probe)(id, *ip, *(ip+1), *(ip+2), *(ip+3), *(ip+4)); + + if (uthread) + uthread->t_dtrace_syscall_args = (void *)0; + } #if 0 /* XXX */ /* + * APPLE NOTE: Not implemented. * We want to explicitly allow DTrace consumers to stop a process * before it actually executes the meat of the syscall. */ @@ -856,7 +715,7 @@ dtrace_machtrace_syscall(struct mach_call_args *args) } static void -machtrace_init(mach_trap_t *actual, machtrace_sysent_t **interposed) +machtrace_init(const mach_trap_t *actual, machtrace_sysent_t **interposed) { machtrace_sysent_t *msysent = *interposed; int i; @@ -867,16 +726,16 @@ machtrace_init(mach_trap_t *actual, machtrace_sysent_t **interposed) } for (i = 0; i < NSYSCALL; i++) { - mach_trap_t *a = &actual[i]; + const mach_trap_t *a = &actual[i]; machtrace_sysent_t *s = &msysent[i]; if (LOADABLE_SYSCALL(a) && !LOADED_SYSCALL(a)) continue; - if ((mach_call_t)(a->mach_trap_function) == (mach_call_t)(dtrace_machtrace_syscall)) + if (a->mach_trap_function == (mach_call_t)(dtrace_machtrace_syscall)) continue; - s->stsy_underlying = (sy_call_t *)a->mach_trap_function; + s->stsy_underlying = a->mach_trap_function; } } @@ -935,7 +794,7 @@ machtrace_destroy(void *arg, dtrace_id_t id, void *parg) } /*ARGSUSED*/ -static void +static int machtrace_enable(void *arg, dtrace_id_t id, void *parg) { #pragma unused(arg) /* __APPLE__ */ @@ -951,13 +810,20 @@ machtrace_enable(void *arg, dtrace_id_t id, void *parg) } if (enabled) { - ASSERT(sysent[sysnum].sy_callc == (void *)dtrace_machtrace_syscall); - return; + ASSERT(mach_trap_table[sysnum].mach_trap_function == (void *)dtrace_machtrace_syscall); + return(0); + } + + lck_mtx_lock(&dtrace_systrace_lock); + + if (mach_trap_table[sysnum].mach_trap_function == machtrace_sysent[sysnum].stsy_underlying) { + vm_offset_t dss = (vm_offset_t)&dtrace_machtrace_syscall; + ml_nofault_copy((vm_offset_t)&dss, (vm_offset_t)&mach_trap_table[sysnum].mach_trap_function, sizeof(vm_offset_t)); } - (void) casptr(&mach_trap_table[sysnum].mach_trap_function, - (void *)machtrace_sysent[sysnum].stsy_underlying, - (void *)dtrace_machtrace_syscall); + lck_mtx_unlock(&dtrace_systrace_lock); + + return(0); } /*ARGSUSED*/ @@ -971,10 +837,13 @@ machtrace_disable(void *arg, dtrace_id_t id, void *parg) machtrace_sysent[sysnum].stsy_return == DTRACE_IDNONE); if (disable) { - (void) casptr(&mach_trap_table[sysnum].mach_trap_function, - (void *)dtrace_machtrace_syscall, - (void *)machtrace_sysent[sysnum].stsy_underlying); + lck_mtx_lock(&dtrace_systrace_lock); + + if (mach_trap_table[sysnum].mach_trap_function == (mach_call_t)dtrace_machtrace_syscall) { + ml_nofault_copy((vm_offset_t)&machtrace_sysent[sysnum].stsy_underlying, (vm_offset_t)&mach_trap_table[sysnum].mach_trap_function, sizeof(vm_offset_t)); + } + lck_mtx_unlock(&dtrace_systrace_lock); } if (SYSTRACE_ISENTRY((uintptr_t)parg)) { @@ -1000,7 +869,7 @@ static dtrace_pops_t machtrace_pops = { NULL, NULL, NULL, - NULL, + machtrace_getarg, NULL, machtrace_destroy }; @@ -1017,16 +886,6 @@ machtrace_attach(dev_info_t *devi, ddi_attach_cmd_t cmd) return (DDI_FAILURE); } -#if !defined(__APPLE__) - machtrace_probe = (void (*)())dtrace_probe; - membar_enter(); - - if (ddi_create_minor_node(devi, "machtrace", S_IFCHR, 0, - DDI_PSEUDO, NULL) == DDI_FAILURE || - dtrace_register("mach_trap", &machtrace_attr, DTRACE_PRIV_USER, NULL, - &machtrace_pops, NULL, &machtrace_id) != 0) { - machtrace_probe = systrace_stub; -#else machtrace_probe = dtrace_probe; membar_enter(); @@ -1035,7 +894,6 @@ machtrace_attach(dev_info_t *devi, ddi_attach_cmd_t cmd) dtrace_register("mach_trap", &machtrace_attr, DTRACE_PRIV_USER, NULL, &machtrace_pops, NULL, &machtrace_id) != 0) { machtrace_probe = (void (*))&systrace_stub; -#endif /* __APPLE__ */ ddi_remove_minor_node(devi, NULL); return (DDI_FAILURE); } @@ -1101,4 +959,49 @@ void systrace_init( void ) panic("systrace_init: called twice!\n"); } #undef SYSTRACE_MAJOR -#endif /* __APPLE__ */ + +static uint64_t +systrace_getarg(void *arg, dtrace_id_t id, void *parg, int argno, int aframes) +{ +#pragma unused(arg,id,parg,aframes) /* __APPLE__ */ + uint64_t val = 0; + syscall_arg_t *stack = (syscall_arg_t *)NULL; + + uthread_t uthread = (uthread_t)get_bsdthread_info(current_thread()); + + if (uthread) + stack = (syscall_arg_t *)uthread->t_dtrace_syscall_args; + + if (!stack) + return(0); + + DTRACE_CPUFLAG_SET(CPU_DTRACE_NOFAULT); + /* dtrace_probe arguments arg0 .. arg4 are 64bits wide */ + val = (uint64_t)*(stack+argno); + DTRACE_CPUFLAG_CLEAR(CPU_DTRACE_NOFAULT); + return (val); +} + + +static uint64_t +machtrace_getarg(void *arg, dtrace_id_t id, void *parg, int argno, int aframes) +{ +#pragma unused(arg,id,parg,aframes) /* __APPLE__ */ + uint64_t val = 0; + syscall_arg_t *stack = (syscall_arg_t *)NULL; + + uthread_t uthread = (uthread_t)get_bsdthread_info(current_thread()); + + if (uthread) + stack = (syscall_arg_t *)uthread->t_dtrace_syscall_args; + + if (!stack) + return(0); + + DTRACE_CPUFLAG_SET(CPU_DTRACE_NOFAULT); + /* dtrace_probe arguments arg0 .. arg4 are 64bits wide */ + val = (uint64_t)*(stack+argno); + DTRACE_CPUFLAG_CLEAR(CPU_DTRACE_NOFAULT); + return (val); +} +