svn commit: r233409 - in head/sys/cddl/dev: dtrace/mips lockstat
profile
Oleksandr Tymoshenko
gonzo at FreeBSD.org
Sat Mar 24 05:14:38 UTC 2012
Author: gonzo
Date: Sat Mar 24 05:14:37 2012
New Revision: 233409
URL: http://svn.freebsd.org/changeset/base/233409
Log:
Add device part of DTrace/MIPS code
Added:
head/sys/cddl/dev/dtrace/mips/
head/sys/cddl/dev/dtrace/mips/dtrace_asm.S (contents, props changed)
head/sys/cddl/dev/dtrace/mips/dtrace_isa.c (contents, props changed)
head/sys/cddl/dev/dtrace/mips/dtrace_subr.c (contents, props changed)
head/sys/cddl/dev/dtrace/mips/regset.h (contents, props changed)
Modified:
head/sys/cddl/dev/lockstat/lockstat.c
head/sys/cddl/dev/profile/profile.c
Added: head/sys/cddl/dev/dtrace/mips/dtrace_asm.S
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/sys/cddl/dev/dtrace/mips/dtrace_asm.S Sat Mar 24 05:14:37 2012 (r233409)
@@ -0,0 +1,303 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License, Version 1.0 only
+ * (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
+ *
+ * $FreeBSD$
+ */
+/*
+ * Copyright 2004 Sun Microsystems, Inc. All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#define _ASM
+#define _LOCORE
+#define LOCORE
+
+#include <sys/cpuvar_defs.h>
+#include <sys/dtrace.h>
+
+#include <machine/asm.h>
+#include <machine/cpu.h>
+#include <machine/cpuregs.h>
+#include <machine/regnum.h>
+
+#include "assym.s"
+
+ .set noreorder # Noreorder is default style!
+
+/*
+ * Primitives
+ */
+
+ .text
+
+/*
+void dtrace_membar_producer(void)
+*/
+LEAF(dtrace_membar_producer)
+ j ra
+ nop
+END(dtrace_membar_producer)
+
+/*
+void dtrace_membar_consumer(void)
+*/
+LEAF(dtrace_membar_consumer)
+ j ra
+ nop
+END(dtrace_membar_consumer)
+
+/*
+dtrace_icookie_t dtrace_interrupt_disable(void)
+*/
+LEAF(dtrace_interrupt_disable)
+ mfc0 t0, MIPS_COP_0_STATUS
+ move v0, t0
+ and v0, v0, MIPS_SR_INT_IE
+ and t0, t0, ~MIPS_SR_INT_IE
+ mtc0 t0, MIPS_COP_0_STATUS
+ j ra
+ nop
+END(dtrace_interrupt_disable)
+
+/*
+void dtrace_interrupt_enable(dtrace_icookie_t cookie)
+*/
+LEAF(dtrace_interrupt_enable)
+ mfc0 t0, MIPS_COP_0_STATUS
+ beqz a0, not_enabled
+ or t0, t0, MIPS_SR_INT_IE
+ mtc0 t0, MIPS_COP_0_STATUS
+not_enabled:
+ j ra
+ nop
+END(dtrace_interrupt_enable)
+
+/*
+uint32_t dtrace_cas32(uint32_t *target, uint32_t cmp, uint32_t new)
+*/
+LEAF(dtrace_cas32)
+1:
+ move t1, a2
+ ll t0, 0(a0)
+ bne t0, a1, 2f
+ nop
+ sc t1, 0(a0)
+ beqz t1, 1b
+ nop
+2: move v0, t0
+ j ra
+ nop
+END(dtrace_cas32)
+
+/*
+void *
+dtrace_casptr(void *target, void *cmp, void *new)
+*/
+LEAF(dtrace_casptr)
+1:
+ move t1, a2
+ PTR_LL t0, 0(a0)
+ bne t0, a1, 2f
+ nop
+ PTR_SC t1, 0(a0)
+ beqz t1, 1b
+ nop
+2: move v0, t0
+ j ra
+ nop
+END(dtrace_casptr)
+
+
+/*
+uintptr_t
+dtrace_fulword(void *addr)
+*/
+LEAF(dtrace_fulword)
+END(dtrace_fulword)
+
+/*
+uint8_t
+dtrace_fuword8_nocheck(void *addr)
+*/
+LEAF(dtrace_fuword8_nocheck)
+ lbu v0, 0(a0)
+ j ra
+ nop
+END(dtrace_fuword8_nocheck)
+
+/*
+uint16_t
+dtrace_fuword16_nocheck(void *addr)
+*/
+LEAF(dtrace_fuword16_nocheck)
+ lhu v0, 0(a0)
+ j ra
+ nop
+END(dtrace_fuword16_nocheck)
+
+/*
+uint32_t
+dtrace_fuword32_nocheck(void *addr)
+*/
+LEAF(dtrace_fuword32_nocheck)
+ lwu v0, 0(a0)
+ j ra
+ nop
+END(dtrace_fuword32_nocheck)
+
+/*
+uint64_t
+dtrace_fuword64_nocheck(void *addr)
+*/
+LEAF(dtrace_fuword64_nocheck)
+#if defined(__mips_n64) || defined(__mips_n32)
+ ld v0, 0(a0)
+#else
+ lw v1,4(a0)
+ lw v0,0(a0)
+#endif
+ j ra
+ nop
+END(dtrace_fuword64_nocheck)
+
+/*
+XXX: unoptimized
+void
+dtrace_copy(uintptr_t src, uintptr_t dest, size_t size)
+*/
+LEAF(dtrace_copy)
+1:
+ beqz a2, 2f
+ nop
+ lbu t0, 0(a0)
+ sb t0, 0(a1)
+ daddu a0, a0, 1
+ daddu a1, a1, 1
+ dsubu a2, a2, 1
+ j 1b
+ nop
+2:
+ j ra
+ nop
+END(dtrace_copy)
+
+/*
+XXX: Unoptimized. Check for flags on page boundaries only(?)
+void
+dtrace_copystr(uintptr_t uaddr, uintptr_t kaddr, size_t size,
+ volatile uint16_t *flags)
+*/
+LEAF(dtrace_copystr)
+1:
+ lbu t0, 0(a0)
+ sb t0, 0(a1)
+ daddu a0, a0, 1
+ daddu a1, a1, 1
+ dsubu a2, a2, 1
+ beqz t0, 2f
+ nop
+ lhu t1, (a3)
+ and t1, t1, CPU_DTRACE_BADADDR
+ bnez t1, 2f
+ nop
+
+ bnez a2, 1b
+ nop
+2:
+ j ra
+ nop
+END(dtrace_copystr)
+
+/*
+void dtrace_invop_init(void)
+*/
+LEAF(dtrace_invop_init)
+ /* XXX: impement it properly */
+ dla t0, dtrace_invop_jump_addr
+ /* dla t1, dtrace_invop_start */
+ sd zero, 0(t0)
+ j ra
+ nop
+END(dtrace_invop_init)
+
+/*
+void dtrace_invop_uninit(void)
+*/
+LEAF(dtrace_invop_uninit)
+ dla t0, dtrace_invop_jump_addr
+ sd zero, 0(t0)
+ j ra
+ nop
+END(dtrace_invop_uninit)
+
+/*
+ * The panic() and cmn_err() functions invoke vpanic() as a common entry point
+ * into the panic code implemented in panicsys(). vpanic() is responsible
+ * for passing through the format string and arguments, and constructing a
+ * regs structure on the stack into which it saves the current register
+ * values. If we are not dying due to a fatal trap, these registers will
+ * then be preserved in panicbuf as the current processor state. Before
+ * invoking panicsys(), vpanic() activates the first panic trigger (see
+ * common/os/panic.c) and switches to the panic_stack if successful. Note that
+ * DTrace takes a slightly different panic path if it must panic from probe
+ * context. Instead of calling panic, it calls into dtrace_vpanic(), which
+ * sets up the initial stack as vpanic does, calls dtrace_panic_trigger(), and
+ * branches back into vpanic().
+ */
+
+/*
+void
+vpanic(const char *format, va_list alist)
+*/
+LEAF(vpanic) /* Initial stack layout: */
+
+vpanic_common:
+ j ra
+ nop
+END(vpanic)
+
+
+
+/*
+void
+dtrace_vpanic(const char *format, va_list alist)
+*/
+LEAF(dtrace_vpanic) /* Initial stack layout: */
+
+#if 0
+ jal dtrace_panic_trigger /* %eax = dtrace_panic_trigger() */
+ nop
+#endif
+ j vpanic_common
+ nop
+
+END(dtrace_vpanic)
+
+/*
+uintptr_t
+dtrace_caller(int aframes)
+*/
+LEAF(dtrace_caller)
+ li v0, -1
+ j ra
+ nop
+END(dtrace_caller)
+
Added: head/sys/cddl/dev/dtrace/mips/dtrace_isa.c
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/sys/cddl/dev/dtrace/mips/dtrace_isa.c Sat Mar 24 05:14:37 2012 (r233409)
@@ -0,0 +1,698 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License, Version 1.0 only
+ * (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
+ *
+ * $FreeBSD$
+ */
+/*
+ * Copyright 2005 Sun Microsystems, Inc. All rights reserved.
+ * Use is subject to license terms.
+ */
+#include <sys/cdefs.h>
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/kernel.h>
+#include <sys/stack.h>
+#include <sys/pcpu.h>
+
+#include <machine/frame.h>
+#include <machine/md_var.h>
+#include <machine/reg.h>
+
+#include <vm/vm.h>
+#include <vm/vm_param.h>
+#include <vm/pmap.h>
+
+#include <machine/db_machdep.h>
+#include <machine/md_var.h>
+#include <machine/mips_opcode.h>
+#include <machine/vmparam.h>
+#include <ddb/db_sym.h>
+#include <ddb/ddb.h>
+#include <sys/kdb.h>
+
+#include "regset.h"
+
+#ifdef __mips_n64
+#define MIPS_IS_VALID_KERNELADDR(reg) ((((reg) & 3) == 0) && \
+ ((vm_offset_t)(reg) >= MIPS_XKPHYS_START))
+#else
+#define MIPS_IS_VALID_KERNELADDR(reg) ((((reg) & 3) == 0) && \
+ ((vm_offset_t)(reg) >= MIPS_KSEG0_START))
+#endif
+
+
+
+/*
+ * Wee need some reasonable default to prevent backtrace code
+ * from wandering too far
+ */
+#define MAX_FUNCTION_SIZE 0x10000
+#define MAX_PROLOGUE_SIZE 0x100
+
+uint8_t dtrace_fuword8_nocheck(void *);
+uint16_t dtrace_fuword16_nocheck(void *);
+uint32_t dtrace_fuword32_nocheck(void *);
+uint64_t dtrace_fuword64_nocheck(void *);
+
+static int dtrace_next_frame(register_t *pc, register_t *sp, register_t *args, int *valid_args);
+static int dtrace_next_uframe(register_t *pc, register_t *sp, register_t *ra);
+
+void
+dtrace_getpcstack(pc_t *pcstack, int pcstack_limit, int aframes,
+ uint32_t *intrpc)
+{
+ int depth = 0;
+ vm_offset_t callpc;
+ pc_t caller = (pc_t) solaris_cpu[curcpu].cpu_dtrace_caller;
+ register_t sp, ra, pc;
+
+ if (intrpc != 0)
+ pcstack[depth++] = (pc_t) intrpc;
+
+ aframes++;
+
+ sp = (register_t)(intptr_t)__builtin_frame_address(0);
+ ra = (register_t)(intptr_t)__builtin_return_address(0);
+
+ __asm __volatile(
+ "jal 99f\n"
+ "nop\n"
+ "99:\n"
+ "move %0, $31\n" /* get ra */
+ "move $31, %1\n" /* restore ra */
+ : "=r" (pc)
+ : "r" (ra));
+
+ while (depth < pcstack_limit) {
+
+ callpc = pc;
+
+ if (aframes > 0) {
+ aframes--;
+ if ((aframes == 0) && (caller != 0)) {
+ pcstack[depth++] = caller;
+ }
+ }
+ else {
+ pcstack[depth++] = callpc;
+ }
+
+ if (dtrace_next_frame(&pc, &sp, NULL, NULL) < 0)
+ break;
+ }
+
+ for (; depth < pcstack_limit; depth++) {
+ pcstack[depth] = 0;
+ }
+}
+
+void
+dtrace_getupcstack(uint64_t *pcstack, int pcstack_limit)
+{
+ proc_t *p = curproc;
+ struct trapframe *tf;
+ register_t sp, ra, pc;
+ volatile uint16_t *flags =
+ (volatile uint16_t *)&cpu_core[curcpu].cpuc_dtrace_flags;
+
+ 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 (p == NULL || (tf = curthread->td_frame) == NULL)
+ goto zero;
+
+ *pcstack++ = (uint64_t)p->p_pid;
+ pcstack_limit--;
+
+ if (pcstack_limit <= 0)
+ return;
+
+ pc = (uint64_t)tf->pc;
+ sp = (uint64_t)tf->sp;
+ ra = (uint64_t)tf->ra;
+ *pcstack++ = (uint64_t)tf->pc;
+
+ /*
+ * Unwind, and unwind, and unwind
+ */
+ while (1) {
+ if (dtrace_next_uframe(&pc, &sp, &ra) < 0)
+ break;
+
+ *pcstack++ = pc;
+ pcstack_limit--;
+
+ if (pcstack_limit <= 0)
+ break;
+ }
+
+zero:
+ while (pcstack_limit-- > 0)
+ *pcstack++ = 0;
+}
+
+int
+dtrace_getustackdepth(void)
+{
+ int n = 0;
+ proc_t *p = curproc;
+ struct trapframe *tf;
+ register_t sp, ra, pc;
+ volatile uint16_t *flags =
+ (volatile uint16_t *)&cpu_core[curcpu].cpuc_dtrace_flags;
+
+ if (*flags & CPU_DTRACE_FAULT)
+ return (0);
+
+ if (p == NULL || (tf = curthread->td_frame) == NULL)
+ return (0);
+
+ pc = (uint64_t)tf->pc;
+ sp = (uint64_t)tf->sp;
+ ra = (uint64_t)tf->ra;
+ n++;
+
+ /*
+ * Unwind, and unwind, and unwind
+ */
+ while (1) {
+ if (dtrace_next_uframe(&pc, &sp, &ra) < 0)
+ break;
+ n++;
+ }
+
+ return (n);
+}
+
+void
+dtrace_getufpstack(uint64_t *pcstack, uint64_t *fpstack, int pcstack_limit)
+{
+ printf("IMPLEMENT ME: %s\n", __func__);
+}
+
+/*ARGSUSED*/
+uint64_t
+dtrace_getarg(int arg, int aframes)
+{
+ int i;
+ register_t sp, ra, pc;
+ /* XXX: Fix this ugly code */
+ register_t args[8];
+ int valid[8];
+
+ sp = (register_t)(intptr_t)__builtin_frame_address(0);
+ ra = (register_t)(intptr_t)__builtin_return_address(0);
+
+ __asm __volatile(
+ "jal 99f\n"
+ "nop\n"
+ "99:\n"
+ "move %0, $31\n" /* get ra */
+ "move $31, %1\n" /* restore ra */
+ : "=r" (pc)
+ : "r" (ra));
+
+ for (i = 0; i <= aframes + 1; i++) {
+ if (dtrace_next_frame(&pc, &sp, args, valid) < 0) {
+ printf("%s: stack ends at frame #%d\n", __func__, i);
+ return (0);
+ }
+ }
+
+ if (arg < 8) {
+ if (valid[arg])
+ return (args[arg]);
+ else
+ printf("%s: request arg%d is not valid\n", __func__, arg);
+ }
+
+ return (0);
+}
+
+int
+dtrace_getstackdepth(int aframes)
+{
+ register_t sp, ra, pc;
+ int depth = 0;
+
+ sp = (register_t)(intptr_t)__builtin_frame_address(0);
+ ra = (register_t)(intptr_t)__builtin_return_address(0);
+
+ __asm __volatile(
+ "jal 99f\n"
+ "nop\n"
+ "99:\n"
+ "move %0, $31\n" /* get ra */
+ "move $31, %1\n" /* restore ra */
+ : "=r" (pc)
+ : "r" (ra));
+
+ for (;;) {
+ if (dtrace_next_frame(&pc, &sp, NULL, NULL) < 0)
+ break;
+ depth++;
+ }
+
+ if (depth < aframes)
+ return 0;
+ else
+ return depth - aframes;
+}
+
+ulong_t
+dtrace_getreg(struct trapframe *rp, uint_t reg)
+{
+
+ return (0);
+}
+
+static int
+dtrace_next_frame(register_t *pc, register_t *sp,
+ register_t *args, int *valid_args)
+{
+ InstFmt i;
+ /*
+ * Arrays for a0..a3 registers and flags if content
+ * of these registers is valid, e.g. obtained from the stack
+ */
+ uintptr_t va;
+ unsigned instr, mask;
+ unsigned int frames = 0;
+ int more, stksize;
+ register_t ra = 0;
+ int arg, r;
+ vm_offset_t addr;
+
+ /*
+ * Invalidate arguments values
+ */
+ if (valid_args) {
+ for (r = 0; r < 8; r++)
+ valid_args[r] = 0;
+ }
+
+ /* Jump here after a nonstandard (interrupt handler) frame */
+ stksize = 0;
+ if (frames++ > 100) {
+ /* return breaks stackframe-size heuristics with gcc -O2 */
+ goto error; /* XXX */
+ }
+
+ /* check for bad SP: could foul up next frame */
+ if (!MIPS_IS_VALID_KERNELADDR(*sp)) {
+ goto error;
+ }
+
+ /* check for bad PC */
+ if (!MIPS_IS_VALID_KERNELADDR(*pc)) {
+ goto error;
+ }
+
+ /*
+ * Find the beginning of the current subroutine by scanning
+ * backwards from the current PC for the end of the previous
+ * subroutine.
+ */
+ va = *pc - sizeof(int);
+ while (1) {
+ instr = kdbpeek((int *)va);
+
+ /* [d]addiu sp,sp,-X */
+ if (((instr & 0xffff8000) == 0x27bd8000)
+ || ((instr & 0xffff8000) == 0x67bd8000))
+ break;
+
+ /* jr ra */
+ if (instr == 0x03e00008) {
+ /* skip over branch-delay slot instruction */
+ va += 2 * sizeof(int);
+ break;
+ }
+
+ va -= sizeof(int);
+ }
+
+ /* skip over nulls which might separate .o files */
+ while ((instr = kdbpeek((int *)va)) == 0)
+ va += sizeof(int);
+
+ /* scan forwards to find stack size and any saved registers */
+ stksize = 0;
+ more = 3;
+ mask = 0;
+ for (; more; va += sizeof(int),
+ more = (more == 3) ? 3 : more - 1) {
+ /* stop if hit our current position */
+ if (va >= *pc)
+ break;
+ instr = kdbpeek((int *)va);
+ i.word = instr;
+ switch (i.JType.op) {
+ case OP_SPECIAL:
+ switch (i.RType.func) {
+ case OP_JR:
+ case OP_JALR:
+ more = 2; /* stop after next instruction */
+ break;
+
+ case OP_SYSCALL:
+ case OP_BREAK:
+ more = 1; /* stop now */
+ };
+ break;
+
+ case OP_BCOND:
+ case OP_J:
+ case OP_JAL:
+ case OP_BEQ:
+ case OP_BNE:
+ case OP_BLEZ:
+ case OP_BGTZ:
+ more = 2; /* stop after next instruction */
+ break;
+
+ case OP_COP0:
+ case OP_COP1:
+ case OP_COP2:
+ case OP_COP3:
+ switch (i.RType.rs) {
+ case OP_BCx:
+ case OP_BCy:
+ more = 2; /* stop after next instruction */
+ };
+ break;
+
+ case OP_SW:
+ /* look for saved registers on the stack */
+ if (i.IType.rs != 29)
+ break;
+ /* only restore the first one */
+ if (mask & (1 << i.IType.rt))
+ break;
+ mask |= (1 << i.IType.rt);
+ addr = (vm_offset_t)(*sp + (short)i.IType.imm);
+ switch (i.IType.rt) {
+ case 4:/* a0 */
+ case 5:/* a1 */
+ case 6:/* a2 */
+ case 7:/* a3 */
+#if defined(__mips_n64) || defined(__mips_n32)
+ case 8:/* a4 */
+ case 9:/* a5 */
+ case 10:/* a6 */
+ case 11:/* a7 */
+#endif
+ arg = i.IType.rt - 4;
+ if (args)
+ args[arg] = kdbpeek((int*)addr);
+ if (valid_args)
+ valid_args[arg] = 1;
+ break;
+ case 31: /* ra */
+ ra = kdbpeek((int *)addr);
+ }
+ break;
+
+ case OP_SD:
+ /* look for saved registers on the stack */
+ if (i.IType.rs != 29)
+ break;
+ /* only restore the first one */
+ if (mask & (1 << i.IType.rt))
+ break;
+ mask |= (1 << i.IType.rt);
+ addr = (vm_offset_t)(*sp + (short)i.IType.imm);
+ switch (i.IType.rt) {
+ case 4:/* a0 */
+ case 5:/* a1 */
+ case 6:/* a2 */
+ case 7:/* a3 */
+#if defined(__mips_n64) || defined(__mips_n32)
+ case 8:/* a4 */
+ case 9:/* a5 */
+ case 10:/* a6 */
+ case 11:/* a7 */
+#endif
+ arg = i.IType.rt - 4;
+ if (args)
+ args[arg] = kdbpeekd((int *)addr);
+ if (valid_args)
+ valid_args[arg] = 1;
+ break;
+
+ case 31: /* ra */
+ ra = kdbpeekd((int *)addr);
+ }
+ break;
+
+ case OP_ADDI:
+ case OP_ADDIU:
+ case OP_DADDI:
+ case OP_DADDIU:
+ /* look for stack pointer adjustment */
+ if (i.IType.rs != 29 || i.IType.rt != 29)
+ break;
+ stksize = -((short)i.IType.imm);
+ }
+ }
+
+ if (!MIPS_IS_VALID_KERNELADDR(ra))
+ return (-1);
+
+ *pc = ra;
+ *sp += stksize;
+
+ return (0);
+error:
+ return (-1);
+}
+
+static int
+dtrace_next_uframe(register_t *pc, register_t *sp, register_t *ra)
+{
+ int offset, registers_on_stack;
+ uint32_t opcode, mask;
+ register_t function_start;
+ int stksize;
+ InstFmt i;
+
+ registers_on_stack = 0;
+ mask = 0;
+ function_start = 0;
+ offset = 0;
+ stksize = 0;
+
+ while (offset < MAX_FUNCTION_SIZE) {
+ opcode = dtrace_fuword32((void *)(vm_offset_t)(*pc - offset));
+
+ /* [d]addiu sp, sp, -X*/
+ if (((opcode & 0xffff8000) == 0x27bd8000)
+ || ((opcode & 0xffff8000) == 0x67bd8000)) {
+ function_start = *pc - offset;
+ registers_on_stack = 1;
+ break;
+ }
+
+ /* lui gp, X */
+ if ((opcode & 0xffff8000) == 0x3c1c0000) {
+ /*
+ * Function might start with this instruction
+ * Keep an eye on "jr ra" and sp correction
+ * with positive value further on
+ */
+ function_start = *pc - offset;
+ }
+
+ if (function_start) {
+ /*
+ * Stop looking further. Possible end of
+ * function instruction: it means there is no
+ * stack modifications, sp is unchanged
+ */
+
+ /* [d]addiu sp,sp,X */
+ if (((opcode & 0xffff8000) == 0x27bd0000)
+ || ((opcode & 0xffff8000) == 0x67bd0000))
+ break;
+
+ if (opcode == 0x03e00008)
+ break;
+ }
+
+ offset += sizeof(int);
+ }
+
+ if (!function_start)
+ return (-1);
+
+ if (registers_on_stack) {
+ offset = 0;
+ while ((offset < MAX_PROLOGUE_SIZE)
+ && ((function_start + offset) < *pc)) {
+ i.word =
+ dtrace_fuword32((void *)(vm_offset_t)(function_start + offset));
+ switch (i.JType.op) {
+ case OP_SW:
+ /* look for saved registers on the stack */
+ if (i.IType.rs != 29)
+ break;
+ /* only restore the first one */
+ if (mask & (1 << i.IType.rt))
+ break;
+ mask |= (1 << i.IType.rt);
+ if (i.IType.rt == 31)
+ *ra = dtrace_fuword32((void *)(vm_offset_t)(*sp + (short)i.IType.imm));
+ break;
+
+ case OP_SD:
+ /* look for saved registers on the stack */
+ if (i.IType.rs != 29)
+ break;
+ /* only restore the first one */
+ if (mask & (1 << i.IType.rt))
+ break;
+ mask |= (1 << i.IType.rt);
+ /* ra */
+ if (i.IType.rt == 31)
+ *ra = dtrace_fuword64((void *)(vm_offset_t)(*sp + (short)i.IType.imm));
+ break;
+
+ case OP_ADDI:
+ case OP_ADDIU:
+ case OP_DADDI:
+ case OP_DADDIU:
+ /* look for stack pointer adjustment */
+ if (i.IType.rs != 29 || i.IType.rt != 29)
+ break;
+ stksize = -((short)i.IType.imm);
+ }
+
+ offset += sizeof(int);
+ }
+ }
+
+ /*
+ * We reached the end of backtrace
+ */
+ if (*pc == *ra)
+ return (-1);
+
+ *pc = *ra;
+ *sp += stksize;
+
+ return (0);
+}
+
+static int
+dtrace_copycheck(uintptr_t uaddr, uintptr_t kaddr, size_t size)
+{
+
+ if (uaddr + size > VM_MAXUSER_ADDRESS || uaddr + size < uaddr) {
+ DTRACE_CPUFLAG_SET(CPU_DTRACE_BADADDR);
+ cpu_core[curcpu].cpuc_dtrace_illval = uaddr;
+ return (0);
+ }
+
+ return (1);
+}
+
+void
+dtrace_copyin(uintptr_t uaddr, uintptr_t kaddr, size_t size,
+ volatile uint16_t *flags)
+{
+ if (dtrace_copycheck(uaddr, kaddr, size))
+ dtrace_copy(uaddr, kaddr, size);
+}
+
+void
+dtrace_copyout(uintptr_t kaddr, uintptr_t uaddr, size_t size,
+ volatile uint16_t *flags)
+{
+ if (dtrace_copycheck(uaddr, kaddr, size))
+ dtrace_copy(kaddr, uaddr, size);
+}
+
+void
+dtrace_copyinstr(uintptr_t uaddr, uintptr_t kaddr, size_t size,
+ volatile uint16_t *flags)
+{
+ if (dtrace_copycheck(uaddr, kaddr, size))
+ dtrace_copystr(uaddr, kaddr, size, flags);
+}
+
+void
+dtrace_copyoutstr(uintptr_t kaddr, uintptr_t uaddr, size_t size,
+ volatile uint16_t *flags)
+{
+ if (dtrace_copycheck(uaddr, kaddr, size))
+ dtrace_copystr(kaddr, uaddr, size, flags);
+}
+
+uint8_t
+dtrace_fuword8(void *uaddr)
+{
+ if ((uintptr_t)uaddr > VM_MAXUSER_ADDRESS) {
+ DTRACE_CPUFLAG_SET(CPU_DTRACE_BADADDR);
+ cpu_core[curcpu].cpuc_dtrace_illval = (uintptr_t)uaddr;
+ return (0);
+ }
+ return (dtrace_fuword8_nocheck(uaddr));
+}
+
+uint16_t
+dtrace_fuword16(void *uaddr)
+{
+ if ((uintptr_t)uaddr > VM_MAXUSER_ADDRESS) {
+ DTRACE_CPUFLAG_SET(CPU_DTRACE_BADADDR);
+ cpu_core[curcpu].cpuc_dtrace_illval = (uintptr_t)uaddr;
+ return (0);
+ }
+ return (dtrace_fuword16_nocheck(uaddr));
+}
+
+uint32_t
+dtrace_fuword32(void *uaddr)
+{
+ if ((uintptr_t)uaddr > VM_MAXUSER_ADDRESS) {
+ DTRACE_CPUFLAG_SET(CPU_DTRACE_BADADDR);
+ cpu_core[curcpu].cpuc_dtrace_illval = (uintptr_t)uaddr;
+ return (0);
+ }
+ return (dtrace_fuword32_nocheck(uaddr));
+}
+
+uint64_t
+dtrace_fuword64(void *uaddr)
+{
*** DIFF OUTPUT TRUNCATED AT 1000 LINES ***
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