--- /dev/null
+/*
+ * 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 2006 Sun Microsystems, Inc. All rights reserved.
+ * Use is subject to license terms.
+ */
+
+/* #pragma ident "@(#)sdt.c 1.6 06/03/24 SMI" */
+
+#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 <kern/cpu_data.h>
+#include <kern/thread.h>
+#include <mach/thread_status.h>
+#include <mach/vm_param.h>
+
+#include <sys/dtrace.h>
+#include <sys/dtrace_impl.h>
+
+#include <sys/dtrace_glue.h>
+
+#include <sys/sdt_impl.h>
+
+extern sdt_probe_t **sdt_probetab;
+
+int
+sdt_invop(__unused uintptr_t addr, __unused uintptr_t *stack, __unused uintptr_t eax)
+{
+#pragma unused(eax)
+ sdt_probe_t *sdt = sdt_probetab[SDT_ADDR2NDX(addr)];
+
+ for (; sdt != NULL; sdt = sdt->sdp_hashnext) {
+ if ((uintptr_t) sdt->sdp_patchpoint == addr) {
+ struct arm_saved_state* regs = (struct arm_saved_state*) stack;
+ uintptr_t stack4 = *((uintptr_t*) regs->sp);
+
+ dtrace_probe(sdt->sdp_id, regs->r[0], regs->r[1], regs->r[2], regs->r[3], stack4);
+
+ return (DTRACE_INVOP_NOP);
+ }
+ }
+
+ return (0);
+}
+
+struct frame {
+ struct frame *backchain;
+ uintptr_t retaddr;
+};
+
+/*ARGSUSED*/
+uint64_t
+sdt_getarg(void *arg, dtrace_id_t id, void *parg, int argno, int aframes)
+{
+#pragma unused(arg,id,parg) /* __APPLE__ */
+ uint64_t val = 0;
+ struct frame *fp = (struct frame *)__builtin_frame_address(0);
+ uintptr_t *stack;
+ uintptr_t pc;
+ int i;
+
+ /*
+ * On ARM, up to four args are passed via registers; r0,r1,r2,r3
+ * So coming into this function, arg >= 4 should be on the stack.
+ * e.g. arg==5 refers to the 6th arg passed to the probed function.
+ */
+ int inreg = 4;
+
+ for (i = 1; i <= aframes; i++) {
+ fp = fp->backchain;
+ pc = fp->retaddr;
+
+ if (dtrace_invop_callsite_pre != NULL
+ && pc > (uintptr_t)dtrace_invop_callsite_pre
+ && pc <= (uintptr_t)dtrace_invop_callsite_post) {
+
+ /*
+ * When we pass through the invalid op handler,
+ * we expect to find the save area structure,
+ * pushed on the stack where we took the trap.
+ * If the argument we seek is passed in a register, then
+ * we can load it directly from this saved area.
+ * If the argument we seek is passed on the stack, then
+ * we increment the frame pointer further, to find the
+ * pushed args
+ */
+
+ /* fp points to the dtrace_invop activation */
+ fp = fp->backchain; /* to the fbt_perfCallback activation */
+ fp = fp->backchain; /* to the sleh_undef activation */
+
+#if __BIGGEST_ALIGNMENT__ > 4
+ /**
+ * rdar://problem/24228656: On armv7k, the stack is realigned in sleh_undef2 to
+ * be 16-bytes aligned and the old value is pushed to
+ * the stack, so we retrieve it from here
+ */
+ arm_saved_state_t *saved_state = (arm_saved_state_t *)(uintptr_t*)*((uintptr_t *)&fp[1]);
+#else
+ arm_saved_state_t *saved_state = (arm_saved_state_t *)((uintptr_t *)&fp[1]);
+#endif
+ if (argno <= inreg) {
+ /* For clarity only... should not get here */
+ stack = (uintptr_t *)&saved_state->r[0];
+ } else {
+ fp = (struct frame *)(saved_state->sp);
+ stack = (uintptr_t *)&fp[0]; /* Find marshalled arguments */
+ argno -= inreg;
+ }
+ goto load;
+ }
+ }
+
+ /*
+ * We know that we did not come through a trap to get into
+ * dtrace_probe() -- We arrive here when the provider has
+ * called dtrace_probe() directly.
+ * The probe ID is the first argument to dtrace_probe().
+ * We must advance beyond that to get the argX.
+ */
+ argno++; /* Advance past probeID */
+
+ if (argno <= inreg) {
+ /*
+ * This shouldn't happen. If the argument is passed in a
+ * register then it should have been, well, passed in a
+ * register...
+ */
+ DTRACE_CPUFLAG_SET(CPU_DTRACE_ILLOP);
+ return (0);
+ }
+
+ argno -= (inreg + 1);
+ stack = (uintptr_t *)&fp[1]; /* Find marshalled arguments */
+
+load:
+ DTRACE_CPUFLAG_SET(CPU_DTRACE_NOFAULT);
+ /* dtrace_probe arguments arg0 .. arg4 are 64bits wide */
+ val = (uint64_t)(*(((uintptr_t *)stack) + argno));
+ DTRACE_CPUFLAG_CLEAR(CPU_DTRACE_NOFAULT);
+ return (val);
+
+}
projects / apple / xnu.git / blobdiff