--- /dev/null
+/*
+ * Copyright (c) 2005-2006 Apple Computer, Inc. All rights reserved.
+ *
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
+ *
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.
+ *
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.
+ *
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ *
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
+ */
+
+#define MACH__POSIX_C_SOURCE_PRIVATE 1 /* pulls in suitable savearea from mach/ppc/thread_status.h */
+#include <kern/thread.h>
+#include <mach/thread_status.h>
+
+typedef x86_saved_state_t savearea_t;
+
+#include <stdarg.h>
+#include <string.h>
+#include <sys/malloc.h>
+#include <sys/time.h>
+#include <sys/systm.h>
+#include <sys/proc.h>
+#include <sys/proc_internal.h>
+#include <sys/kauth.h>
+#include <sys/dtrace.h>
+#include <sys/dtrace_impl.h>
+#include <libkern/OSAtomic.h>
+#include <kern/thread_call.h>
+#include <kern/task.h>
+#include <kern/sched_prim.h>
+#include <miscfs/devfs/devfs.h>
+#include <mach/vm_param.h>
+
+extern dtrace_id_t dtrace_probeid_error; /* special ERROR probe */
+
+void
+dtrace_probe_error(dtrace_state_t *state, dtrace_epid_t epid, int which,
+ int fault, int fltoffs, uint64_t illval)
+{
+ /*
+ * For the case of the error probe firing lets
+ * stash away "illval" here, and special-case retrieving it in DIF_VARIABLE_ARG.
+ */
+ state->dts_arg_error_illval = illval;
+ dtrace_probe( dtrace_probeid_error, (uint64_t)(uintptr_t)state, epid, which, fault, fltoffs );
+}
+
+/*
+ * Atomicity and synchronization
+ */
+void
+dtrace_membar_producer(void)
+{
+ __asm__ volatile("sfence");
+}
+
+void
+dtrace_membar_consumer(void)
+{
+ __asm__ volatile("lfence");
+}
+
+/*
+ * Interrupt manipulation
+ * XXX dtrace_getipl() can be called from probe context.
+ */
+int
+dtrace_getipl(void)
+{
+ /*
+ * XXX Drat, get_interrupt_level is MACH_KERNEL_PRIVATE
+ * in osfmk/kern/cpu_data.h
+ */
+ /* return get_interrupt_level(); */
+ return (ml_at_interrupt_context() ? 1: 0);
+}
+
+/*
+ * MP coordination
+ */
+
+extern void mp_broadcast(
+ void (*action_func)(void *),
+ void *arg);
+
+typedef struct xcArg {
+ processorid_t cpu;
+ dtrace_xcall_t f;
+ void *arg;
+} xcArg_t;
+
+static void
+xcRemote( void *foo )
+{
+ xcArg_t *pArg = (xcArg_t *)foo;
+
+ if ( pArg->cpu == CPU->cpu_id || pArg->cpu == DTRACE_CPUALL ) {
+ (pArg->f)(pArg->arg);
+ }
+}
+
+/*
+ * dtrace_xcall() is not called from probe context.
+ */
+void
+dtrace_xcall(processorid_t cpu, dtrace_xcall_t f, void *arg)
+{
+ xcArg_t xcArg;
+
+ xcArg.cpu = cpu;
+ xcArg.f = f;
+ xcArg.arg = arg;
+
+ mp_broadcast( xcRemote, (void *)&xcArg);
+}
+
+/*
+ * Runtime and ABI
+ */
+extern greg_t
+dtrace_getfp(void)
+{
+ return (greg_t)__builtin_frame_address(0);
+}
+
+uint64_t
+dtrace_getreg(struct regs *savearea, uint_t reg)
+{
+ boolean_t is64Bit = proc_is64bit(current_proc());
+ x86_saved_state_t *regs = (x86_saved_state_t *)savearea;
+
+ if (is64Bit) {
+ /* beyond register SS */
+ if (reg > x86_SAVED_STATE64_COUNT - 1) {
+ DTRACE_CPUFLAG_SET(CPU_DTRACE_ILLOP);
+ return (0);
+ }
+ return ((uint64_t *)(&(regs->ss_64.gs)))[reg];
+ } else {
+ /* beyond register SS */
+ if (reg > x86_SAVED_STATE32_COUNT - 1) {
+ DTRACE_CPUFLAG_SET(CPU_DTRACE_ILLOP);
+ return (0);
+ }
+ return (uint64_t)((unsigned int *)(&(regs->ss_32.gs)))[reg];
+ }
+
+}
+
+#define RETURN_OFFSET 4
+#define RETURN_OFFSET64 8
+
+static int
+dtrace_getustack_common(uint64_t *pcstack, int pcstack_limit, user_addr_t pc,
+ user_addr_t sp)
+{
+#if 0
+ volatile uint16_t *flags =
+ (volatile uint16_t *)&cpu_core[CPU->cpu_id].cpuc_dtrace_flags;
+
+ uintptr_t oldcontext = lwp->lwp_oldcontext; /* XXX signal stack crawl */
+ size_t s1, s2;
+#endif
+ int ret = 0;
+ boolean_t is64Bit = proc_is64bit(current_proc());
+
+ ASSERT(pcstack == NULL || pcstack_limit > 0);
+
+#if 0 /* XXX signal stack crawl */
+ if (p->p_model == DATAMODEL_NATIVE) {
+ s1 = sizeof (struct frame) + 2 * sizeof (long);
+ s2 = s1 + sizeof (siginfo_t);
+ } else {
+ s1 = sizeof (struct frame32) + 3 * sizeof (int);
+ s2 = s1 + sizeof (siginfo32_t);
+ }
+#endif
+
+ while (pc != 0) {
+ ret++;
+ if (pcstack != NULL) {
+ *pcstack++ = (uint64_t)pc;
+ pcstack_limit--;
+ if (pcstack_limit <= 0)
+ break;
+ }
+
+ if (sp == 0)
+ break;
+
+#if 0 /* XXX signal stack crawl */
+ if (oldcontext == sp + s1 || oldcontext == sp + s2) {
+ if (p->p_model == DATAMODEL_NATIVE) {
+ ucontext_t *ucp = (ucontext_t *)oldcontext;
+ greg_t *gregs = ucp->uc_mcontext.gregs;
+
+ sp = dtrace_fulword(&gregs[REG_FP]);
+ pc = dtrace_fulword(&gregs[REG_PC]);
+
+ oldcontext = dtrace_fulword(&ucp->uc_link);
+ } else {
+ ucontext32_t *ucp = (ucontext32_t *)oldcontext;
+ greg32_t *gregs = ucp->uc_mcontext.gregs;
+
+ sp = dtrace_fuword32(&gregs[EBP]);
+ pc = dtrace_fuword32(&gregs[EIP]);
+
+ oldcontext = dtrace_fuword32(&ucp->uc_link);
+ }
+ }
+ else
+#endif
+ {
+ if (is64Bit) {
+ pc = dtrace_fuword64((sp + RETURN_OFFSET64));
+ sp = dtrace_fuword64(sp);
+ } else {
+ pc = dtrace_fuword32((sp + RETURN_OFFSET));
+ sp = dtrace_fuword32(sp);
+ }
+ }
+
+#if 0 /* XXX */
+ /*
+ * This is totally bogus: if we faulted, we're going to clear
+ * the fault and break. This is to deal with the apparently
+ * broken Java stacks on x86.
+ */
+ if (*flags & CPU_DTRACE_FAULT) {
+ *flags &= ~CPU_DTRACE_FAULT;
+ break;
+ }
+#endif
+ }
+
+ return (ret);
+}
+
+void
+dtrace_getupcstack(uint64_t *pcstack, int pcstack_limit)
+{
+ thread_t thread = current_thread();
+ x86_saved_state_t *regs;
+ user_addr_t pc, sp, fp;
+ volatile uint16_t *flags =
+ (volatile uint16_t *)&cpu_core[CPU->cpu_id].cpuc_dtrace_flags;
+ int n;
+ boolean_t is64Bit = proc_is64bit(current_proc());
+
+ if (*flags & CPU_DTRACE_FAULT)
+ return;
+
+ if (pcstack_limit <= 0)
+ return;
+
+ /*
+ * If there's no user context we still need to zero the stack.
+ */
+ if (thread == NULL)
+ goto zero;
+
+ regs = (x86_saved_state_t *)find_user_regs(thread);
+ if (regs == NULL)
+ goto zero;
+
+ *pcstack++ = (uint64_t)proc_selfpid();
+ pcstack_limit--;
+
+ if (pcstack_limit <= 0)
+ return;
+
+ if (is64Bit) {
+ pc = regs->ss_64.isf.rip;
+ sp = regs->ss_64.isf.rsp;
+ fp = regs->ss_64.rbp;
+ } else {
+ pc = regs->ss_32.eip;
+ sp = regs->ss_32.uesp;
+ fp = regs->ss_32.ebp;
+ }
+
+ if (DTRACE_CPUFLAG_ISSET(CPU_DTRACE_ENTRY)) {
+ *pcstack++ = (uint64_t)pc;
+ pcstack_limit--;
+ if (pcstack_limit <= 0)
+ return;
+
+ if (is64Bit)
+ pc = dtrace_fuword64(sp);
+ else
+ pc = dtrace_fuword32(sp);
+ }
+
+ /*
+ * Note that unlike ppc, the x86 code does not use
+ * CPU_DTRACE_USTACK_FP. This is because x86 always
+ * traces from the fp, even in syscall/profile/fbt
+ * providers.
+ */
+ n = dtrace_getustack_common(pcstack, pcstack_limit, pc, fp);
+ ASSERT(n >= 0);
+ ASSERT(n <= pcstack_limit);
+
+ pcstack += n;
+ pcstack_limit -= n;
+
+zero:
+ while (pcstack_limit-- > 0)
+ *pcstack++ = 0;
+}
+
+int
+dtrace_getustackdepth(void)
+{
+ thread_t thread = current_thread();
+ x86_saved_state_t *regs;
+ user_addr_t pc, sp, fp;
+ int n = 0;
+ boolean_t is64Bit = proc_is64bit(current_proc());
+
+ if (thread == NULL)
+ return 0;
+
+ if (DTRACE_CPUFLAG_ISSET(CPU_DTRACE_FAULT))
+ return (-1);
+
+ regs = (x86_saved_state_t *)find_user_regs(thread);
+ if (regs == NULL)
+ return 0;
+
+ if (is64Bit) {
+ pc = regs->ss_64.isf.rip;
+ sp = regs->ss_64.isf.rsp;
+ fp = regs->ss_64.rbp;
+ } else {
+ pc = regs->ss_32.eip;
+ sp = regs->ss_32.uesp;
+ fp = regs->ss_32.ebp;
+ }
+
+ if (DTRACE_CPUFLAG_ISSET(CPU_DTRACE_ENTRY)) {
+ n++;
+
+ if (is64Bit)
+ pc = dtrace_fuword64(sp);
+ else
+ pc = dtrace_fuword32(sp);
+ }
+
+ /*
+ * Note that unlike ppc, the x86 code does not use
+ * CPU_DTRACE_USTACK_FP. This is because x86 always
+ * traces from the fp, even in syscall/profile/fbt
+ * providers.
+ */
+
+ n += dtrace_getustack_common(NULL, 0, pc, fp);
+
+ return (n);
+}
+
+void
+dtrace_getufpstack(uint64_t *pcstack, uint64_t *fpstack, int pcstack_limit)
+{
+ thread_t thread = current_thread();
+ savearea_t *regs;
+ user_addr_t pc, sp;
+ volatile uint16_t *flags =
+ (volatile uint16_t *)&cpu_core[CPU->cpu_id].cpuc_dtrace_flags;
+#if 0
+ uintptr_t oldcontext;
+ size_t s1, s2;
+#endif
+ boolean_t is64Bit = proc_is64bit(current_proc());
+
+ if (*flags & CPU_DTRACE_FAULT)
+ return;
+
+ if (pcstack_limit <= 0)
+ return;
+
+ /*
+ * If there's no user context we still need to zero the stack.
+ */
+ if (thread == NULL)
+ goto zero;
+
+ regs = (savearea_t *)find_user_regs(thread);
+ if (regs == NULL)
+ goto zero;
+
+ *pcstack++ = (uint64_t)proc_selfpid();
+ pcstack_limit--;
+
+ if (pcstack_limit <= 0)
+ return;
+
+ pc = regs->ss_32.eip;
+ sp = regs->ss_32.ebp;
+
+#if 0 /* XXX signal stack crawl */
+ oldcontext = lwp->lwp_oldcontext;
+
+ if (p->p_model == DATAMODEL_NATIVE) {
+ s1 = sizeof (struct frame) + 2 * sizeof (long);
+ s2 = s1 + sizeof (siginfo_t);
+ } else {
+ s1 = sizeof (struct frame32) + 3 * sizeof (int);
+ s2 = s1 + sizeof (siginfo32_t);
+ }
+#endif
+
+ if (DTRACE_CPUFLAG_ISSET(CPU_DTRACE_ENTRY)) {
+ *pcstack++ = (uint64_t)pc;
+ *fpstack++ = 0;
+ pcstack_limit--;
+ if (pcstack_limit <= 0)
+ return;
+
+ if (is64Bit)
+ pc = dtrace_fuword64(sp);
+ else
+ pc = dtrace_fuword32(sp);
+ }
+
+ while (pc != 0) {
+ *pcstack++ = (uint64_t)pc;
+ *fpstack++ = sp;
+ pcstack_limit--;
+ if (pcstack_limit <= 0)
+ break;
+
+ if (sp == 0)
+ break;
+
+#if 0 /* XXX signal stack crawl */
+ if (oldcontext == sp + s1 || oldcontext == sp + s2) {
+ if (p->p_model == DATAMODEL_NATIVE) {
+ ucontext_t *ucp = (ucontext_t *)oldcontext;
+ greg_t *gregs = ucp->uc_mcontext.gregs;
+
+ sp = dtrace_fulword(&gregs[REG_FP]);
+ pc = dtrace_fulword(&gregs[REG_PC]);
+
+ oldcontext = dtrace_fulword(&ucp->uc_link);
+ } else {
+ ucontext_t *ucp = (ucontext_t *)oldcontext;
+ greg_t *gregs = ucp->uc_mcontext.gregs;
+
+ sp = dtrace_fuword32(&gregs[EBP]);
+ pc = dtrace_fuword32(&gregs[EIP]);
+
+ oldcontext = dtrace_fuword32(&ucp->uc_link);
+ }
+ }
+ else
+#endif
+ {
+ if (is64Bit) {
+ pc = dtrace_fuword64((sp + RETURN_OFFSET64));
+ sp = dtrace_fuword64(sp);
+ } else {
+ pc = dtrace_fuword32((sp + RETURN_OFFSET));
+ sp = dtrace_fuword32(sp);
+ }
+ }
+
+#if 0 /* XXX */
+ /*
+ * This is totally bogus: if we faulted, we're going to clear
+ * the fault and break. This is to deal with the apparently
+ * broken Java stacks on x86.
+ */
+ if (*flags & CPU_DTRACE_FAULT) {
+ *flags &= ~CPU_DTRACE_FAULT;
+ break;
+ }
+#endif
+ }
+
+zero:
+ while (pcstack_limit-- > 0)
+ *pcstack++ = 0;
+}
+
+void
+dtrace_getpcstack(pc_t *pcstack, int pcstack_limit, int aframes,
+ uint32_t *intrpc)
+{
+ struct frame *fp = (struct frame *)dtrace_getfp();
+ struct frame *nextfp, *minfp, *stacktop;
+ int depth = 0;
+ int last = 0;
+ uintptr_t pc;
+ uintptr_t caller = CPU->cpu_dtrace_caller;
+ int on_intr;
+
+ if ((on_intr = CPU_ON_INTR(CPU)) != 0)
+ stacktop = (struct frame *)dtrace_get_cpu_int_stack_top();
+ else
+ stacktop = (struct frame *)(dtrace_get_kernel_stack(current_thread()) + KERNEL_STACK_SIZE);
+
+ minfp = fp;
+
+ aframes++;
+
+ if (intrpc != NULL && depth < pcstack_limit)
+ pcstack[depth++] = (pc_t)intrpc;
+
+ while (depth < pcstack_limit) {
+ nextfp = *(struct frame **)fp;
+ pc = *(uintptr_t *)(((uint32_t)fp) + RETURN_OFFSET);
+
+ if (nextfp <= minfp || nextfp >= stacktop) {
+ if (on_intr) {
+ /*
+ * Hop from interrupt stack to thread stack.
+ */
+ vm_offset_t kstack_base = dtrace_get_kernel_stack(current_thread());
+
+ minfp = (struct frame *)kstack_base;
+ stacktop = (struct frame *)(kstack_base + KERNEL_STACK_SIZE);
+
+ on_intr = 0;
+ continue;
+ }
+ /*
+ * This is the last frame we can process; indicate
+ * that we should return after processing this frame.
+ */
+ last = 1;
+ }
+
+ if (aframes > 0) {
+ if (--aframes == 0 && caller != 0) {
+ /*
+ * We've just run out of artificial frames,
+ * and we have a valid caller -- fill it in
+ * now.
+ */
+ ASSERT(depth < pcstack_limit);
+ pcstack[depth++] = (pc_t)caller;
+ caller = 0;
+ }
+ } else {
+ if (depth < pcstack_limit)
+ pcstack[depth++] = (pc_t)pc;
+ }
+
+ if (last) {
+ while (depth < pcstack_limit)
+ pcstack[depth++] = 0;
+ return;
+ }
+
+ fp = nextfp;
+ minfp = fp;
+ }
+}
+
+struct frame {
+ struct frame *backchain;
+ uintptr_t retaddr;
+};
+
+uint64_t
+dtrace_getarg(int arg, int aframes)
+{
+ uint64_t val;
+ struct frame *fp = (struct frame *)dtrace_getfp();
+ uintptr_t *stack;
+ uintptr_t pc;
+ int i;
+
+ for (i = 1; i <= aframes; i++) {
+ fp = fp->backchain;
+ pc = fp->retaddr;
+
+ if (pc == (uintptr_t)dtrace_invop_callsite) {
+ /*
+ * If we pass through the invalid op handler, we will
+ * use the pointer that it passed to the stack as the
+ * second argument to dtrace_invop() as the pointer to
+ * the frame we're hunting for.
+ */
+
+ stack = (uintptr_t *)&fp[1]; /* Find marshalled arguments */
+ fp = (struct frame *)stack[1]; /* Grab *second* argument */
+ stack = (uintptr_t *)&fp[1]; /* Find marshalled arguments */
+ DTRACE_CPUFLAG_SET(CPU_DTRACE_NOFAULT);
+ val = (uint64_t)(stack[arg]);
+ DTRACE_CPUFLAG_CLEAR(CPU_DTRACE_NOFAULT);
+ return val;
+ }
+ }
+
+ /*
+ * Arrive here when provider has called dtrace_probe directly.
+ */
+ stack = (uintptr_t *)&fp[1]; /* Find marshalled arguments */
+ stack++; /* Advance past probeID */
+
+ DTRACE_CPUFLAG_SET(CPU_DTRACE_NOFAULT);
+ val = *(((uint64_t *)stack) + arg); /* dtrace_probe arguments arg0 .. arg4 are 64bits wide */
+ DTRACE_CPUFLAG_CLEAR(CPU_DTRACE_NOFAULT);
+
+ return (val);
+}
+
+/*
+ * Load/Store Safety
+ */
+void
+dtrace_toxic_ranges(void (*func)(uintptr_t base, uintptr_t limit))
+{
+ /*
+ * "base" is the smallest toxic address in the range, "limit" is the first
+ * VALID address greater than "base".
+ */
+ func(0x0, VM_MIN_KERNEL_ADDRESS);
+ func(VM_MAX_KERNEL_ADDRESS + 1, ~(uintptr_t)0);
+}
+
+extern boolean_t pmap_valid_page(ppnum_t pn);
+
+boolean_t
+dtxnu_is_RAM_page(ppnum_t pn)
+{
+ return pmap_valid_page(pn);
+}
+
projects / apple / xnu.git / blobdiff