f9bb753844
GETATTRs being generated - one from lookup()/namei() and the other from nfs_open() (for cto consistency). This change eliminates the GETATTR in nfs_open() if an otw GETATTR was done from the namei() path. Instead of extending the vop interface, we timestamp each attr load, and use this to detect whether a GETATTR was done from namei() for this syscall. Introduces a thread-local variable that counts the syscalls made by the thread and uses <pid, tid, thread syscalls> as the attrload timestamp. Thanks to jhb@ and peter@ for a discussion on thread state that could be used as the timestamp with minimal overhead.
684 lines
15 KiB
C
684 lines
15 KiB
C
/*-
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* Copyright (C) 1995, 1996 Wolfgang Solfrank.
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* Copyright (C) 1995, 1996 TooLs GmbH.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by TooLs GmbH.
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* 4. The name of TooLs GmbH may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $NetBSD: trap.c,v 1.58 2002/03/04 04:07:35 dbj Exp $
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_ktrace.h"
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#include <sys/param.h>
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#include <sys/kdb.h>
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#include <sys/proc.h>
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#include <sys/ktr.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/pioctl.h>
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#include <sys/ptrace.h>
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#include <sys/reboot.h>
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#include <sys/syscall.h>
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#include <sys/sysent.h>
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#include <sys/systm.h>
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#include <sys/uio.h>
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#include <sys/signalvar.h>
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#ifdef KTRACE
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#include <sys/ktrace.h>
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#endif
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#include <sys/vmmeter.h>
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#include <security/audit/audit.h>
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#include <vm/vm.h>
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#include <vm/pmap.h>
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#include <vm/vm_extern.h>
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#include <vm/vm_param.h>
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#include <vm/vm_kern.h>
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#include <vm/vm_map.h>
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#include <vm/vm_page.h>
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#include <machine/cpu.h>
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#include <machine/db_machdep.h>
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#include <machine/fpu.h>
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#include <machine/frame.h>
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#include <machine/pcb.h>
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#include <machine/pmap.h>
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#include <machine/psl.h>
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#include <machine/trap.h>
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#include <machine/spr.h>
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#include <machine/sr.h>
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void trap(struct trapframe *);
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static void trap_fatal(struct trapframe *frame);
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static void printtrap(u_int vector, struct trapframe *frame, int isfatal,
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int user);
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static int trap_pfault(struct trapframe *frame, int user);
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static int fix_unaligned(struct thread *td, struct trapframe *frame);
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static int handle_onfault(struct trapframe *frame);
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static void syscall(struct trapframe *frame);
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static __inline void setusr(u_int);
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int setfault(faultbuf); /* defined in locore.S */
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/* Why are these not defined in a header? */
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int badaddr(void *, size_t);
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int badaddr_read(void *, size_t, int *);
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extern char *syscallnames[];
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struct powerpc_exception {
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u_int vector;
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char *name;
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};
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static struct powerpc_exception powerpc_exceptions[] = {
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{ 0x0100, "system reset" },
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{ 0x0200, "machine check" },
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{ 0x0300, "data storage interrupt" },
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{ 0x0400, "instruction storage interrupt" },
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{ 0x0500, "external interrupt" },
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{ 0x0600, "alignment" },
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{ 0x0700, "program" },
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{ 0x0800, "floating-point unavailable" },
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{ 0x0900, "decrementer" },
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{ 0x0c00, "system call" },
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{ 0x0d00, "trace" },
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{ 0x0e00, "floating-point assist" },
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{ 0x0f00, "performance monitoring" },
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{ 0x0f20, "altivec unavailable" },
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{ 0x1000, "instruction tlb miss" },
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{ 0x1100, "data load tlb miss" },
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{ 0x1200, "data store tlb miss" },
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{ 0x1300, "instruction breakpoint" },
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{ 0x1400, "system management" },
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{ 0x1600, "altivec assist" },
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{ 0x1700, "thermal management" },
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{ 0x2000, "run mode/trace" },
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{ 0x3000, NULL }
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};
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static const char *
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trapname(u_int vector)
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{
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struct powerpc_exception *pe;
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for (pe = powerpc_exceptions; pe->vector != 0x3000; pe++) {
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if (pe->vector == vector)
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return (pe->name);
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}
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return ("unknown");
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}
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void
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trap(struct trapframe *frame)
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{
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struct thread *td;
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struct proc *p;
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int sig, type, user;
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u_int ucode;
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ksiginfo_t ksi;
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PCPU_LAZY_INC(cnt.v_trap);
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td = PCPU_GET(curthread);
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p = td->td_proc;
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type = ucode = frame->exc;
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sig = 0;
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user = frame->srr1 & PSL_PR;
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CTR3(KTR_TRAP, "trap: %s type=%s (%s)", p->p_comm,
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trapname(type), user ? "user" : "kernel");
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if (user) {
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td->td_pticks = 0;
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td->td_frame = frame;
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if (td->td_ucred != p->p_ucred)
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cred_update_thread(td);
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/* User Mode Traps */
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switch (type) {
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case EXC_RUNMODETRC:
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case EXC_TRC:
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frame->srr1 &= ~PSL_SE;
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sig = SIGTRAP;
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break;
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case EXC_DSI:
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case EXC_ISI:
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sig = trap_pfault(frame, 1);
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break;
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case EXC_SC:
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syscall(frame);
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break;
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case EXC_FPU:
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KASSERT((td->td_pcb->pcb_flags & PCB_FPU) != PCB_FPU,
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("FPU already enabled for thread"));
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enable_fpu(td);
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break;
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#ifdef ALTIVEC
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case EXC_VEC:
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if ((vecthread = PCPU_GET(vecthread)) != NULL) {
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KASSERT(vecthread != td,
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("altivec already enabled"));
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save_vec(vecthread);
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}
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PCPU_SET(vecthread, td);
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td->td_pcb->pcb_veccpu = PCPU_GET(cpuid);
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enable_vec(td);
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frame->srr1 |= PSL_VEC;
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break;
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#else
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case EXC_VEC:
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case EXC_VECAST:
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sig = SIGILL;
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break;
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#endif /* ALTIVEC */
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case EXC_ALI:
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if (fix_unaligned(td, frame) != 0)
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sig = SIGBUS;
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else
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frame->srr0 += 4;
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break;
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case EXC_PGM:
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/* XXX temporarily */
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/* XXX: Magic Number? */
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if (frame->srr1 & 0x0002000)
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sig = SIGTRAP;
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else
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sig = SIGILL;
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break;
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default:
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trap_fatal(frame);
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}
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} else {
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/* Kernel Mode Traps */
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KASSERT(cold || td->td_ucred != NULL,
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("kernel trap doesn't have ucred"));
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switch (type) {
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case EXC_DSI:
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if (trap_pfault(frame, 0) == 0)
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return;
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break;
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case EXC_MCHK:
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if (handle_onfault(frame))
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return;
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break;
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default:
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break;
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}
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trap_fatal(frame);
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}
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#ifdef ALTIVEC
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if (td != PCPU_GET(vecthread) ||
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td->td_pcb->pcb_veccpu != PCPU_GET(cpuid))
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frame->srr1 &= ~PSL_VEC;
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#endif /* ALTIVEC */
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if (sig != 0) {
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if (p->p_sysent->sv_transtrap != NULL)
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sig = (p->p_sysent->sv_transtrap)(sig, type);
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ksiginfo_init_trap(&ksi);
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ksi.ksi_signo = sig;
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ksi.ksi_code = (int) ucode; /* XXX, not POSIX */
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/* ksi.ksi_addr = ? */
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ksi.ksi_trapno = type;
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trapsignal(td, &ksi);
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}
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userret(td, frame);
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mtx_assert(&Giant, MA_NOTOWNED);
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}
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static void
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trap_fatal(struct trapframe *frame)
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{
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printtrap(frame->exc, frame, 1, (frame->srr1 & PSL_PR));
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#ifdef KDB
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if ((debugger_on_panic || kdb_active) &&
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kdb_trap(frame->exc, 0, frame))
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return;
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#endif
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panic("%s trap", trapname(frame->exc));
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}
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static void
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printtrap(u_int vector, struct trapframe *frame, int isfatal, int user)
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{
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printf("\n");
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printf("%s %s trap:\n", isfatal ? "fatal" : "handled",
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user ? "user" : "kernel");
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printf("\n");
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printf(" exception = 0x%x (%s)\n", vector >> 8,
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trapname(vector));
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switch (vector) {
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case EXC_DSI:
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printf(" virtual address = 0x%x\n", frame->dar);
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break;
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case EXC_ISI:
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printf(" virtual address = 0x%x\n", frame->srr0);
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break;
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}
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printf(" srr0 = 0x%x\n", frame->srr0);
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printf(" srr1 = 0x%x\n", frame->srr1);
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printf(" curthread = %p\n", curthread);
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if (curthread != NULL)
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printf(" pid = %d, comm = %s\n",
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curthread->td_proc->p_pid, curthread->td_proc->p_comm);
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printf("\n");
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}
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/*
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* Handles a fatal fault when we have onfault state to recover. Returns
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* non-zero if there was onfault recovery state available.
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*/
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static int
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handle_onfault(struct trapframe *frame)
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{
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struct thread *td;
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faultbuf *fb;
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td = curthread;
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fb = td->td_pcb->pcb_onfault;
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if (fb != NULL) {
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frame->srr0 = (*fb)[0];
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frame->fixreg[1] = (*fb)[1];
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frame->fixreg[2] = (*fb)[2];
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frame->fixreg[3] = 1;
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frame->cr = (*fb)[3];
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bcopy(&(*fb)[4], &frame->fixreg[13],
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19 * sizeof(register_t));
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return (1);
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}
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return (0);
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}
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void
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syscall(struct trapframe *frame)
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{
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caddr_t params;
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struct sysent *callp;
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struct thread *td;
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struct proc *p;
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int error, n;
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size_t narg;
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register_t args[10];
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u_int code;
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td = PCPU_GET(curthread);
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p = td->td_proc;
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PCPU_LAZY_INC(cnt.v_syscall);
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#ifdef KSE
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if (p->p_flag & P_SA)
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thread_user_enter(td);
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#endif
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code = frame->fixreg[0];
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params = (caddr_t)(frame->fixreg + FIRSTARG);
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n = NARGREG;
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if (p->p_sysent->sv_prepsyscall) {
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/*
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* The prep code is MP aware.
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*/
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(*p->p_sysent->sv_prepsyscall)(frame, args, &code, ¶ms);
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} else if (code == SYS_syscall) {
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/*
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* code is first argument,
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* followed by actual args.
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*/
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code = *(u_int *) params;
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params += sizeof(register_t);
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n -= 1;
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} else if (code == SYS___syscall) {
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/*
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* Like syscall, but code is a quad,
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* so as to maintain quad alignment
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* for the rest of the args.
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*/
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params += sizeof(register_t);
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code = *(u_int *) params;
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params += sizeof(register_t);
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n -= 2;
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}
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if (p->p_sysent->sv_mask)
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code &= p->p_sysent->sv_mask;
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if (code >= p->p_sysent->sv_size)
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callp = &p->p_sysent->sv_table[0];
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else
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callp = &p->p_sysent->sv_table[code];
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narg = callp->sy_narg;
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if (narg > n) {
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bcopy(params, args, n * sizeof(register_t));
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error = copyin(MOREARGS(frame->fixreg[1]), args + n,
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(narg - n) * sizeof(register_t));
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params = (caddr_t)args;
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} else
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error = 0;
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CTR5(KTR_SYSC, "syscall: p=%s %s(%x %x %x)", p->p_comm,
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syscallnames[code],
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frame->fixreg[FIRSTARG],
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frame->fixreg[FIRSTARG+1],
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frame->fixreg[FIRSTARG+2]);
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#ifdef KTRACE
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if (KTRPOINT(td, KTR_SYSCALL))
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ktrsyscall(code, narg, (register_t *)params);
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#endif
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td->td_syscalls++;
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if (error == 0) {
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td->td_retval[0] = 0;
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td->td_retval[1] = frame->fixreg[FIRSTARG + 1];
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STOPEVENT(p, S_SCE, narg);
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PTRACESTOP_SC(p, td, S_PT_SCE);
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AUDIT_SYSCALL_ENTER(code, td);
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error = (*callp->sy_call)(td, params);
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AUDIT_SYSCALL_EXIT(error, td);
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CTR3(KTR_SYSC, "syscall: p=%s %s ret=%x", p->p_comm,
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syscallnames[code], td->td_retval[0]);
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}
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switch (error) {
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case 0:
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if ((frame->fixreg[0] == SYS___syscall) &&
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(code != SYS_lseek)) {
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/*
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* 64-bit return, 32-bit syscall. Fixup byte order
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*/
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frame->fixreg[FIRSTARG] = 0;
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frame->fixreg[FIRSTARG + 1] = td->td_retval[0];
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} else {
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frame->fixreg[FIRSTARG] = td->td_retval[0];
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frame->fixreg[FIRSTARG + 1] = td->td_retval[1];
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}
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/* XXX: Magic number */
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frame->cr &= ~0x10000000;
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break;
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case ERESTART:
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/*
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* Set user's pc back to redo the system call.
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*/
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frame->srr0 -= 4;
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break;
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case EJUSTRETURN:
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/* nothing to do */
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break;
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default:
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if (p->p_sysent->sv_errsize) {
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if (error >= p->p_sysent->sv_errsize)
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error = -1; /* XXX */
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else
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error = p->p_sysent->sv_errtbl[error];
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}
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frame->fixreg[FIRSTARG] = error;
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/* XXX: Magic number: Carry Flag Equivalent? */
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frame->cr |= 0x10000000;
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break;
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}
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/*
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* Check for misbehavior.
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*/
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WITNESS_WARN(WARN_PANIC, NULL, "System call %s returning",
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(code >= 0 && code < SYS_MAXSYSCALL) ? syscallnames[code] : "???");
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KASSERT(td->td_critnest == 0,
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("System call %s returning in a critical section",
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(code >= 0 && code < SYS_MAXSYSCALL) ? syscallnames[code] : "???"));
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KASSERT(td->td_locks == 0,
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("System call %s returning with %d locks held",
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(code >= 0 && code < SYS_MAXSYSCALL) ? syscallnames[code] : "???",
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td->td_locks));
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#ifdef KTRACE
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if (KTRPOINT(td, KTR_SYSRET))
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ktrsysret(code, error, td->td_retval[0]);
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#endif
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/*
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* Does the comment in the i386 code about errno apply here?
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*/
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STOPEVENT(p, S_SCX, code);
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PTRACESTOP_SC(p, td, S_PT_SCX);
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}
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static int
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trap_pfault(struct trapframe *frame, int user)
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{
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vm_offset_t eva, va;
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struct thread *td;
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struct proc *p;
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vm_map_t map;
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vm_prot_t ftype;
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int rv;
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u_int user_sr;
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td = curthread;
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p = td->td_proc;
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if (frame->exc == EXC_ISI) {
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eva = frame->srr0;
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ftype = VM_PROT_READ | VM_PROT_EXECUTE;
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} else {
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|
eva = frame->dar;
|
|
if (frame->dsisr & DSISR_STORE)
|
|
ftype = VM_PROT_WRITE;
|
|
else
|
|
ftype = VM_PROT_READ;
|
|
}
|
|
|
|
if (user) {
|
|
map = &p->p_vmspace->vm_map;
|
|
} else {
|
|
if ((eva >> ADDR_SR_SHFT) == USER_SR) {
|
|
if (p->p_vmspace == NULL)
|
|
return (SIGSEGV);
|
|
|
|
__asm ("mfsr %0, %1"
|
|
: "=r"(user_sr)
|
|
: "K"(USER_SR));
|
|
eva &= ADDR_PIDX | ADDR_POFF;
|
|
eva |= user_sr << ADDR_SR_SHFT;
|
|
map = &p->p_vmspace->vm_map;
|
|
} else {
|
|
map = kernel_map;
|
|
}
|
|
}
|
|
va = trunc_page(eva);
|
|
|
|
if (map != kernel_map) {
|
|
/*
|
|
* Keep swapout from messing with us during this
|
|
* critical time.
|
|
*/
|
|
PROC_LOCK(p);
|
|
++p->p_lock;
|
|
PROC_UNLOCK(p);
|
|
|
|
/* Fault in the user page: */
|
|
rv = vm_fault(map, va, ftype,
|
|
(ftype & VM_PROT_WRITE) ? VM_FAULT_DIRTY
|
|
: VM_FAULT_NORMAL);
|
|
|
|
PROC_LOCK(p);
|
|
--p->p_lock;
|
|
PROC_UNLOCK(p);
|
|
} else {
|
|
/*
|
|
* Don't have to worry about process locking or stacks in the
|
|
* kernel.
|
|
*/
|
|
rv = vm_fault(map, va, ftype, VM_FAULT_NORMAL);
|
|
}
|
|
|
|
if (rv == KERN_SUCCESS)
|
|
return (0);
|
|
|
|
if (!user && handle_onfault(frame))
|
|
return (0);
|
|
|
|
return (SIGSEGV);
|
|
}
|
|
|
|
static __inline void
|
|
setusr(u_int content)
|
|
{
|
|
__asm __volatile ("isync; mtsr %0,%1; isync"
|
|
:: "n"(USER_SR), "r"(content));
|
|
}
|
|
|
|
int
|
|
badaddr(void *addr, size_t size)
|
|
{
|
|
return (badaddr_read(addr, size, NULL));
|
|
}
|
|
|
|
int
|
|
badaddr_read(void *addr, size_t size, int *rptr)
|
|
{
|
|
struct thread *td;
|
|
faultbuf env;
|
|
int x;
|
|
|
|
/* Get rid of any stale machine checks that have been waiting. */
|
|
__asm __volatile ("sync; isync");
|
|
|
|
td = PCPU_GET(curthread);
|
|
|
|
if (setfault(env)) {
|
|
td->td_pcb->pcb_onfault = 0;
|
|
__asm __volatile ("sync");
|
|
return 1;
|
|
}
|
|
|
|
__asm __volatile ("sync");
|
|
|
|
switch (size) {
|
|
case 1:
|
|
x = *(volatile int8_t *)addr;
|
|
break;
|
|
case 2:
|
|
x = *(volatile int16_t *)addr;
|
|
break;
|
|
case 4:
|
|
x = *(volatile int32_t *)addr;
|
|
break;
|
|
default:
|
|
panic("badaddr: invalid size (%d)", size);
|
|
}
|
|
|
|
/* Make sure we took the machine check, if we caused one. */
|
|
__asm __volatile ("sync; isync");
|
|
|
|
td->td_pcb->pcb_onfault = 0;
|
|
__asm __volatile ("sync"); /* To be sure. */
|
|
|
|
/* Use the value to avoid reorder. */
|
|
if (rptr)
|
|
*rptr = x;
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* For now, this only deals with the particular unaligned access case
|
|
* that gcc tends to generate. Eventually it should handle all of the
|
|
* possibilities that can happen on a 32-bit PowerPC in big-endian mode.
|
|
*/
|
|
|
|
static int
|
|
fix_unaligned(struct thread *td, struct trapframe *frame)
|
|
{
|
|
struct thread *fputhread;
|
|
int indicator, reg;
|
|
double *fpr;
|
|
|
|
indicator = EXC_ALI_OPCODE_INDICATOR(frame->dsisr);
|
|
|
|
switch (indicator) {
|
|
case EXC_ALI_LFD:
|
|
case EXC_ALI_STFD:
|
|
reg = EXC_ALI_RST(frame->dsisr);
|
|
fpr = &td->td_pcb->pcb_fpu.fpr[reg];
|
|
fputhread = PCPU_GET(fputhread);
|
|
|
|
/* Juggle the FPU to ensure that we've initialized
|
|
* the FPRs, and that their current state is in
|
|
* the PCB.
|
|
*/
|
|
if (fputhread != td) {
|
|
if (fputhread)
|
|
save_fpu(fputhread);
|
|
enable_fpu(td);
|
|
}
|
|
save_fpu(td);
|
|
|
|
if (indicator == EXC_ALI_LFD) {
|
|
if (copyin((void *)frame->dar, fpr,
|
|
sizeof(double)) != 0)
|
|
return -1;
|
|
enable_fpu(td);
|
|
} else {
|
|
if (copyout(fpr, (void *)frame->dar,
|
|
sizeof(double)) != 0)
|
|
return -1;
|
|
}
|
|
return 0;
|
|
break;
|
|
}
|
|
|
|
return -1;
|
|
}
|