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Date:      Thu, 24 Nov 2011 19:02:04 +0000 (UTC)
From:      Ryan Stone <rstone@FreeBSD.org>
To:        src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-8@freebsd.org
Subject:   svn commit: r227950 - in stable/8/sys: amd64/amd64 amd64/include cddl/contrib/opensolaris/uts/intel/dtrace i386/i386 i386/include
Message-ID:  <201111241902.pAOJ24tk008718@svn.freebsd.org>

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Author: rstone
Date: Thu Nov 24 19:02:04 2011
New Revision: 227950
URL: http://svn.freebsd.org/changeset/base/227950

Log:
  MFC r227290 and r227291:
  
  r227290:
   Fix the DTrace pid return trap interrupt vector.  Previously we were using
   31, but that vector is reserved.
  
   Without this fix, running dtrace -p <pid> would either cause the target
   process to crash or the kernel to page fault
  
  r227291:
   Replace fasttrap_copyout() with uwrite().  FreeBSD copyout() is not able to
   write to the .text section of a process.

Modified:
  stable/8/sys/amd64/amd64/trap.c
  stable/8/sys/amd64/include/segments.h
  stable/8/sys/amd64/include/trap.h
  stable/8/sys/cddl/contrib/opensolaris/uts/intel/dtrace/fasttrap_isa.c
  stable/8/sys/i386/i386/trap.c
  stable/8/sys/i386/include/segments.h
  stable/8/sys/i386/include/trap.h
Directory Properties:
  stable/8/sys/   (props changed)
  stable/8/sys/amd64/include/xen/   (props changed)
  stable/8/sys/cddl/contrib/opensolaris/   (props changed)
  stable/8/sys/contrib/dev/acpica/   (props changed)
  stable/8/sys/contrib/pf/   (props changed)

Modified: stable/8/sys/amd64/amd64/trap.c
==============================================================================
--- stable/8/sys/amd64/amd64/trap.c	Thu Nov 24 18:57:31 2011	(r227949)
+++ stable/8/sys/amd64/amd64/trap.c	Thu Nov 24 19:02:04 2011	(r227950)
@@ -129,7 +129,7 @@ void dblfault_handler(struct trapframe *
 static int trap_pfault(struct trapframe *, int);
 static void trap_fatal(struct trapframe *, vm_offset_t);
 
-#define MAX_TRAP_MSG		30
+#define MAX_TRAP_MSG		33
 static char *trap_msg[] = {
 	"",					/*  0 unused */
 	"privileged instruction fault",		/*  1 T_PRIVINFLT */
@@ -162,6 +162,9 @@ static char *trap_msg[] = {
 	"machine check trap",			/* 28 T_MCHK */
 	"SIMD floating-point exception",	/* 29 T_XMMFLT */
 	"reserved (unknown) fault",		/* 30 T_RESERVED */
+	"",					/* 31 unused (reserved) */
+	"DTrace pid return trap",		/* 32 T_DTRACE_RET */
+	"DTrace fasttrap probe trap",		/* 33 T_DTRACE_PROBE */
 };
 
 #ifdef KDB
@@ -249,28 +252,26 @@ trap(struct trapframe *frame)
 	 * handled the trap and modified the trap frame so that this
 	 * function can return normally.
 	 */
-	if (dtrace_trap_func != NULL)
-		if ((*dtrace_trap_func)(frame, type))
-			goto out;
 	if (type == T_DTRACE_PROBE || type == T_DTRACE_RET ||
 	    type == T_BPTFLT) {
 		struct reg regs;
-		
+
 		fill_frame_regs(frame, &regs);
 		if (type == T_DTRACE_PROBE &&
 		    dtrace_fasttrap_probe_ptr != NULL &&
 		    dtrace_fasttrap_probe_ptr(&regs) == 0)
-				goto out;
-		if (type == T_BPTFLT &&
+			goto out;
+		else if (type == T_BPTFLT &&
 		    dtrace_pid_probe_ptr != NULL &&
 		    dtrace_pid_probe_ptr(&regs) == 0)
-				goto out;
-		if (type == T_DTRACE_RET &&
+			goto out;
+		else if (type == T_DTRACE_RET &&
 		    dtrace_return_probe_ptr != NULL &&
 		    dtrace_return_probe_ptr(&regs) == 0)
 			goto out;
-
 	}
+	if (dtrace_trap_func != NULL && (*dtrace_trap_func)(frame, type))
+		goto out;
 #endif
 
 	if ((frame->tf_rflags & PSL_I) == 0) {

Modified: stable/8/sys/amd64/include/segments.h
==============================================================================
--- stable/8/sys/amd64/include/segments.h	Thu Nov 24 18:57:31 2011	(r227949)
+++ stable/8/sys/amd64/include/segments.h	Thu Nov 24 19:02:04 2011	(r227950)
@@ -214,7 +214,7 @@ struct region_descriptor {
 #define	IDT_XF		19	/* #XF: SIMD Floating-Point Exception */
 #define	IDT_IO_INTS	NRSVIDT	/* Base of IDT entries for I/O interrupts. */
 #define	IDT_SYSCALL	0x80	/* System Call Interrupt Vector */
-#define	IDT_DTRACE_RET	0x92	/* DTrace pid provider Interrupt Vector */
+#define	IDT_DTRACE_RET	0x20	/* DTrace pid provider Interrupt Vector */
 
 /*
  * Entries in the Global Descriptor Table (GDT)

Modified: stable/8/sys/amd64/include/trap.h
==============================================================================
--- stable/8/sys/amd64/include/trap.h	Thu Nov 24 18:57:31 2011	(r227949)
+++ stable/8/sys/amd64/include/trap.h	Thu Nov 24 19:02:04 2011	(r227950)
@@ -62,8 +62,8 @@
 #define	T_MCHK		28	/* machine check trap */
 #define	T_XMMFLT	29	/* SIMD floating-point exception */
 #define	T_RESERVED	30	/* reserved (unknown) */
-#define	T_DTRACE_RET	31	/* DTrace pid return */
-#define	T_DTRACE_PROBE	32	/* DTrace fasttrap probe */
+#define	T_DTRACE_RET	32	/* DTrace pid return */
+#define	T_DTRACE_PROBE	33	/* DTrace fasttrap probe */
 
 /* XXX most of the following codes aren't used, but could be. */
 

Modified: stable/8/sys/cddl/contrib/opensolaris/uts/intel/dtrace/fasttrap_isa.c
==============================================================================
--- stable/8/sys/cddl/contrib/opensolaris/uts/intel/dtrace/fasttrap_isa.c	Thu Nov 24 18:57:31 2011	(r227949)
+++ stable/8/sys/cddl/contrib/opensolaris/uts/intel/dtrace/fasttrap_isa.c	Thu Nov 24 19:02:04 2011	(r227950)
@@ -97,7 +97,7 @@ uwrite(proc_t *p, void *kaddr, size_t le
 
 	return (proc_ops(UIO_WRITE, p, kaddr, uaddr, len));
 }
-#endif
+#endif /* sun */
 #ifdef __i386__
 #define	r_rax	r_eax
 #define	r_rbx	r_ebx
@@ -1380,6 +1380,7 @@ fasttrap_pid_probe(struct reg *rp)
 	{
 		int ret = 0;
 		uintptr_t addr = 0;
+
 #ifdef __amd64
 		if (p->p_model == DATAMODEL_NATIVE) {
 			addr = rp->r_rsp - sizeof (uintptr_t);
@@ -1558,7 +1559,7 @@ fasttrap_pid_probe(struct reg *rp)
 		 *	------------------------	-----
 		 * a:	<original instruction>		<= 15
 		 *	jmp	<pc + tp->ftt_size>	    5
-		 * b:	<original instrction>		<= 15
+		 * b:	<original instruction>		<= 15
 		 *	int	T_DTRACE_RET		    2
 		 *					-----
 		 *					<= 37
@@ -1731,12 +1732,16 @@ fasttrap_pid_probe(struct reg *rp)
 
 		ASSERT(i <= sizeof (scratch));
 
+
+#if defined(sun)
 		if (fasttrap_copyout(scratch, (char *)addr, i)) {
+#else
+		if (uwrite(curproc, scratch, i, addr)) {
+#endif
 			fasttrap_sigtrap(p, curthread, pc);
 			new_pc = pc;
 			break;
 		}
-
 		if (tp->ftt_retids != NULL) {
 			curthread->t_dtrace_step = 1;
 			curthread->t_dtrace_ret = 1;

Modified: stable/8/sys/i386/i386/trap.c
==============================================================================
--- stable/8/sys/i386/i386/trap.c	Thu Nov 24 18:57:31 2011	(r227949)
+++ stable/8/sys/i386/i386/trap.c	Thu Nov 24 19:02:04 2011	(r227950)
@@ -140,7 +140,7 @@ void dblfault_handler(void);
 
 extern inthand_t IDTVEC(lcall_syscall);
 
-#define MAX_TRAP_MSG		30
+#define MAX_TRAP_MSG		33
 static char *trap_msg[] = {
 	"",					/*  0 unused */
 	"privileged instruction fault",		/*  1 T_PRIVINFLT */
@@ -173,6 +173,10 @@ static char *trap_msg[] = {
 	"machine check trap",			/* 28 T_MCHK */
 	"SIMD floating-point exception",	/* 29 T_XMMFLT */
 	"reserved (unknown) fault",		/* 30 T_RESERVED */
+	"",					/* 31 unused (reserved) */
+	"DTrace pid return trap",               /* 32 T_DTRACE_RET */
+	"DTrace fasttrap probe trap",           /* 33 T_DTRACE_PROBE */
+
 };
 
 #if defined(I586_CPU) && !defined(NO_F00F_HACK)
@@ -269,10 +273,6 @@ trap(struct trapframe *frame)
 	 * handled the trap and modified the trap frame so that this
 	 * function can return normally.
 	 */
-	if ((type == T_PROTFLT || type == T_PAGEFLT) &&
-	    dtrace_trap_func != NULL)
-		if ((*dtrace_trap_func)(frame, type))
-			goto out;
 	if (type == T_DTRACE_PROBE || type == T_DTRACE_RET ||
 	    type == T_BPTFLT) {
 		struct reg regs;
@@ -291,6 +291,9 @@ trap(struct trapframe *frame)
 		    dtrace_return_probe_ptr(&regs) == 0)
 			goto out;
 	}
+	if ((type == T_PROTFLT || type == T_PAGEFLT) &&
+	    dtrace_trap_func != NULL && (*dtrace_trap_func)(frame, type))
+		goto out;
 #endif
 
 	if ((frame->tf_eflags & PSL_I) == 0) {

Modified: stable/8/sys/i386/include/segments.h
==============================================================================
--- stable/8/sys/i386/include/segments.h	Thu Nov 24 18:57:31 2011	(r227949)
+++ stable/8/sys/i386/include/segments.h	Thu Nov 24 19:02:04 2011	(r227950)
@@ -207,7 +207,7 @@ struct region_descriptor {
 #define	IDT_XF		19	/* #XF: SIMD Floating-Point Exception */
 #define	IDT_IO_INTS	NRSVIDT	/* Base of IDT entries for I/O interrupts. */
 #define	IDT_SYSCALL	0x80	/* System Call Interrupt Vector */
-#define	IDT_DTRACE_RET	0x92	/* DTrace pid provider Interrupt Vector */
+#define	IDT_DTRACE_RET	0x20	/* DTrace pid provider Interrupt Vector */
 
 /*
  * Entries in the Global Descriptor Table (GDT)

Modified: stable/8/sys/i386/include/trap.h
==============================================================================
--- stable/8/sys/i386/include/trap.h	Thu Nov 24 18:57:31 2011	(r227949)
+++ stable/8/sys/i386/include/trap.h	Thu Nov 24 19:02:04 2011	(r227950)
@@ -62,8 +62,8 @@
 #define	T_MCHK		28	/* machine check trap */
 #define	T_XMMFLT	29	/* SIMD floating-point exception */
 #define	T_RESERVED	30	/* reserved (unknown) */
-#define	T_DTRACE_RET	31	/* DTrace pid return */
-#define	T_DTRACE_PROBE	32	/* DTrace fasttrap probe */
+#define	T_DTRACE_RET	32	/* DTrace pid return */
+#define	T_DTRACE_PROBE	33	/* DTrace fasttrap probe */
 
 /* XXX most of the following codes aren't used, but could be. */
 



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