1 files changed, 698 insertions, 0 deletions

diff --git a/sys/cddl/dev/dtrace/mips/dtrace_isa.c b/sys/cddl/dev/dtrace/mips/dtrace_isa.c
new file mode 100644
index 0000000..faed749
--- /dev/null
+++ b/sys/cddl/dev/dtrace/mips/dtrace_isa.c
@@ -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)
+{
+	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_fuword64_nocheck(uaddr));
+}