| Current Path : /sys/cddl/dev/dtrace/amd64/ |
FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
| Current File : //sys/cddl/dev/dtrace/amd64/dtrace_isa.c |
/*
* 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: release/9.1.0/sys/cddl/dev/dtrace/amd64/dtrace_isa.c 211608 2010-08-22 10:53:32Z rpaulo $
*/
/*
* 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 <machine/stack.h>
#include <vm/vm.h>
#include <vm/vm_param.h>
#include <vm/pmap.h>
#include "regset.h"
uint8_t dtrace_fuword8_nocheck(void *);
uint16_t dtrace_fuword16_nocheck(void *);
uint32_t dtrace_fuword32_nocheck(void *);
uint64_t dtrace_fuword64_nocheck(void *);
void
dtrace_getpcstack(pc_t *pcstack, int pcstack_limit, int aframes,
uint32_t *intrpc)
{
int depth = 0;
register_t rbp;
struct amd64_frame *frame;
vm_offset_t callpc;
pc_t caller = (pc_t) solaris_cpu[curcpu].cpu_dtrace_caller;
if (intrpc != 0)
pcstack[depth++] = (pc_t) intrpc;
aframes++;
__asm __volatile("movq %%rbp,%0" : "=r" (rbp));
frame = (struct amd64_frame *)rbp;
while (depth < pcstack_limit) {
if (!INKERNEL((long) frame))
break;
callpc = frame->f_retaddr;
if (!INKERNEL(callpc))
break;
if (aframes > 0) {
aframes--;
if ((aframes == 0) && (caller != 0)) {
pcstack[depth++] = caller;
}
}
else {
pcstack[depth++] = callpc;
}
if (frame->f_frame <= frame ||
(vm_offset_t)frame->f_frame >=
(vm_offset_t)rbp + KSTACK_PAGES * PAGE_SIZE)
break;
frame = frame->f_frame;
}
for (; depth < pcstack_limit; depth++) {
pcstack[depth] = 0;
}
}
static int
dtrace_getustack_common(uint64_t *pcstack, int pcstack_limit, uintptr_t pc,
uintptr_t sp)
{
volatile uint16_t *flags =
(volatile uint16_t *)&cpu_core[curcpu].cpuc_dtrace_flags;
int ret = 0;
ASSERT(pcstack == NULL || pcstack_limit > 0);
while (pc != 0) {
ret++;
if (pcstack != NULL) {
*pcstack++ = (uint64_t)pc;
pcstack_limit--;
if (pcstack_limit <= 0)
break;
}
if (sp == 0)
break;
pc = dtrace_fuword64((void *)(sp +
offsetof(struct amd64_frame, f_retaddr)));
sp = dtrace_fuword64((void *)sp);
/*
* 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;
}
}
return (ret);
}
void
dtrace_getupcstack(uint64_t *pcstack, int pcstack_limit)
{
proc_t *p = curproc;
struct trapframe *tf;
uintptr_t pc, sp, fp;
volatile uint16_t *flags =
(volatile uint16_t *)&cpu_core[curcpu].cpuc_dtrace_flags;
int n;
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 = tf->tf_rip;
fp = tf->tf_rbp;
sp = tf->tf_rsp;
if (DTRACE_CPUFLAG_ISSET(CPU_DTRACE_ENTRY)) {
/*
* In an entry probe. The frame pointer has not yet been
* pushed (that happens in the function prologue). The
* best approach is to add the current pc as a missing top
* of stack and back the pc up to the caller, which is stored
* at the current stack pointer address since the call
* instruction puts it there right before the branch.
*/
*pcstack++ = (uint64_t)pc;
pcstack_limit--;
if (pcstack_limit <= 0)
return;
pc = dtrace_fuword64((void *) sp);
}
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)
{
proc_t *p = curproc;
struct trapframe *tf;
uintptr_t pc, fp, sp;
int n = 0;
if (p == NULL || (tf = curthread->td_frame) == NULL)
return (0);
if (DTRACE_CPUFLAG_ISSET(CPU_DTRACE_FAULT))
return (-1);
pc = tf->tf_rip;
fp = tf->tf_rbp;
sp = tf->tf_rsp;
if (DTRACE_CPUFLAG_ISSET(CPU_DTRACE_ENTRY)) {
/*
* In an entry probe. The frame pointer has not yet been
* pushed (that happens in the function prologue). The
* best approach is to add the current pc as a missing top
* of stack and back the pc up to the caller, which is stored
* at the current stack pointer address since the call
* instruction puts it there right before the branch.
*/
pc = dtrace_fuword64((void *) sp);
n++;
}
n += dtrace_getustack_common(NULL, 0, pc, fp);
return (n);
}
void
dtrace_getufpstack(uint64_t *pcstack, uint64_t *fpstack, int pcstack_limit)
{
proc_t *p = curproc;
struct trapframe *tf;
uintptr_t pc, sp, fp;
volatile uint16_t *flags =
(volatile uint16_t *)&cpu_core[curcpu].cpuc_dtrace_flags;
#ifdef notyet /* XXX signal stack */
uintptr_t oldcontext;
size_t s1, s2;
#endif
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 = tf->tf_rip;
sp = tf->tf_rsp;
fp = tf->tf_rbp;
#ifdef notyet /* XXX signal stack */
oldcontext = lwp->lwp_oldcontext;
s1 = sizeof (struct xframe) + 2 * sizeof (long);
s2 = s1 + sizeof (siginfo_t);
#endif
if (DTRACE_CPUFLAG_ISSET(CPU_DTRACE_ENTRY)) {
*pcstack++ = (uint64_t)pc;
*fpstack++ = 0;
pcstack_limit--;
if (pcstack_limit <= 0)
return;
pc = dtrace_fuword64((void *)sp);
}
while (pc != 0) {
*pcstack++ = (uint64_t)pc;
*fpstack++ = fp;
pcstack_limit--;
if (pcstack_limit <= 0)
break;
if (fp == 0)
break;
#ifdef notyet /* XXX signal stack */
if (oldcontext == sp + s1 || oldcontext == sp + s2) {
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
#endif /* XXX */
{
pc = dtrace_fuword64((void *)(fp +
offsetof(struct amd64_frame, f_retaddr)));
fp = dtrace_fuword64((void *)fp);
}
/*
* 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;
}
}
zero:
while (pcstack_limit-- > 0)
*pcstack++ = 0;
}
/*ARGSUSED*/
uint64_t
dtrace_getarg(int arg, int aframes)
{
uintptr_t val;
struct amd64_frame *fp = (struct amd64_frame *)dtrace_getfp();
uintptr_t *stack;
int i;
/*
* A total of 6 arguments are passed via registers; any argument with
* index of 5 or lower is therefore in a register.
*/
int inreg = 5;
for (i = 1; i <= aframes; i++) {
fp = fp->f_frame;
if (fp->f_retaddr == (long)dtrace_invop_callsite) {
/*
* In the case of amd64, we will use the pointer to the
* regs structure that was pushed when we took the
* trap. To get this structure, we must increment
* beyond the frame structure, and then again beyond
* the calling RIP stored in dtrace_invop(). If the
* argument that we're seeking is passed on the stack,
* we'll pull the true stack pointer out of the saved
* registers and decrement our argument by the number
* of arguments passed in registers; if the argument
* we're seeking is passed in regsiters, we can just
* load it directly.
*/
struct reg *rp = (struct reg *)((uintptr_t)&fp[1] +
sizeof (uintptr_t));
if (arg <= inreg) {
stack = (uintptr_t *)&rp->r_rdi;
} else {
stack = (uintptr_t *)(rp->r_rsp);
arg -= inreg;
}
goto load;
}
}
/*
* We know that we did not come through a trap to get into
* dtrace_probe() -- the provider simply called dtrace_probe()
* directly. As this is the case, we need to shift the argument
* that we're looking for: the probe ID is the first argument to
* dtrace_probe(), so the argument n will actually be found where
* one would expect to find argument (n + 1).
*/
arg++;
if (arg <= 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);
}
arg -= (inreg + 1);
stack = (uintptr_t *)&fp[1];
load:
DTRACE_CPUFLAG_SET(CPU_DTRACE_NOFAULT);
val = stack[arg];
DTRACE_CPUFLAG_CLEAR(CPU_DTRACE_NOFAULT);
return (val);
return (0);
}
int
dtrace_getstackdepth(int aframes)
{
int depth = 0;
struct amd64_frame *frame;
vm_offset_t rbp;
aframes++;
rbp = dtrace_getfp();
frame = (struct amd64_frame *)rbp;
depth++;
for(;;) {
if (!INKERNEL((long) frame))
break;
if (!INKERNEL((long) frame->f_frame))
break;
depth++;
if (frame->f_frame <= frame ||
(vm_offset_t)frame->f_frame >=
(vm_offset_t)rbp + KSTACK_PAGES * PAGE_SIZE)
break;
frame = frame->f_frame;
}
if (depth < aframes)
return 0;
else
return depth - aframes;
}
ulong_t
dtrace_getreg(struct trapframe *rp, uint_t reg)
{
/* This table is dependent on reg.d. */
int regmap[] = {
REG_GS, /* 0 GS */
REG_FS, /* 1 FS */
REG_ES, /* 2 ES */
REG_DS, /* 3 DS */
REG_RDI, /* 4 EDI */
REG_RSI, /* 5 ESI */
REG_RBP, /* 6 EBP, REG_FP */
REG_RSP, /* 7 ESP */
REG_RBX, /* 8 EBX, REG_R1 */
REG_RDX, /* 9 EDX */
REG_RCX, /* 10 ECX */
REG_RAX, /* 11 EAX, REG_R0 */
REG_TRAPNO, /* 12 TRAPNO */
REG_ERR, /* 13 ERR */
REG_RIP, /* 14 EIP, REG_PC */
REG_CS, /* 15 CS */
REG_RFL, /* 16 EFL, REG_PS */
REG_RSP, /* 17 UESP, REG_SP */
REG_SS /* 18 SS */
};
if (reg <= SS) {
if (reg >= sizeof (regmap) / sizeof (int)) {
DTRACE_CPUFLAG_SET(CPU_DTRACE_ILLOP);
return (0);
}
reg = regmap[reg];
} else {
/* This is dependent on reg.d. */
reg -= SS + 1;
}
switch (reg) {
case REG_RDI:
return (rp->tf_rdi);
case REG_RSI:
return (rp->tf_rsi);
case REG_RDX:
return (rp->tf_rdx);
case REG_RCX:
return (rp->tf_rcx);
case REG_R8:
return (rp->tf_r8);
case REG_R9:
return (rp->tf_r9);
case REG_RAX:
return (rp->tf_rax);
case REG_RBX:
return (rp->tf_rbx);
case REG_RBP:
return (rp->tf_rbp);
case REG_R10:
return (rp->tf_r10);
case REG_R11:
return (rp->tf_r11);
case REG_R12:
return (rp->tf_r12);
case REG_R13:
return (rp->tf_r13);
case REG_R14:
return (rp->tf_r14);
case REG_R15:
return (rp->tf_r15);
case REG_DS:
return (rp->tf_ds);
case REG_ES:
return (rp->tf_es);
case REG_FS:
return (rp->tf_fs);
case REG_GS:
return (rp->tf_gs);
case REG_TRAPNO:
return (rp->tf_trapno);
case REG_ERR:
return (rp->tf_err);
case REG_RIP:
return (rp->tf_rip);
case REG_CS:
return (rp->tf_cs);
case REG_SS:
return (rp->tf_ss);
case REG_RFL:
return (rp->tf_rflags);
case REG_RSP:
return (rp->tf_rsp);
default:
DTRACE_CPUFLAG_SET(CPU_DTRACE_ILLOP);
return (0);
}
}
static int
dtrace_copycheck(uintptr_t uaddr, uintptr_t kaddr, size_t size)
{
ASSERT(INKERNEL(kaddr) && kaddr + size >= kaddr);
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));
}