99e9dcb817
in diagnostics. It has outlived its usefulness and has started causing panics for people who turn on DIAGNOSTIC, in what is otherwise good code. MFC after: 2 days
273 lines
6.9 KiB
C
273 lines
6.9 KiB
C
/*-
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* Copyright (C) 1994, David Greenman
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* the University of Utah, and William Jolitz.
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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 the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* 386 Trap and System call handling
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*/
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#include "opt_clock.h"
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#include "opt_cpu.h"
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#include "opt_isa.h"
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#include "opt_ktrace.h"
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#include <sys/param.h>
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#include <sys/bus.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <sys/pioctl.h>
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#include <sys/kernel.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/resourcevar.h>
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#include <sys/signalvar.h>
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#include <sys/syscall.h>
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#include <sys/sysctl.h>
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#include <sys/sysent.h>
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#include <sys/uio.h>
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#include <sys/vmmeter.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 <vm/vm.h>
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#include <vm/vm_param.h>
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#include <vm/pmap.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 <vm/vm_extern.h>
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#include <machine/cpu.h>
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#include <machine/intr_machdep.h>
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#include <machine/md_var.h>
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#define IDTVEC(name) __CONCAT(X,name)
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extern inthand_t IDTVEC(int0x80_syscall), IDTVEC(rsvd);
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extern const char *freebsd32_syscallnames[];
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void ia32_syscall(struct trapframe frame); /* Called from asm code */
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void
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ia32_syscall(struct trapframe frame)
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{
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caddr_t params;
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int i;
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struct sysent *callp;
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struct thread *td = curthread;
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struct proc *p = td->td_proc;
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register_t orig_tf_rflags;
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u_int sticks;
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int error;
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int narg;
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u_int32_t args[8];
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u_int64_t args64[8];
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u_int code;
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/*
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* note: PCPU_LAZY_INC() can only be used if we can afford
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* occassional inaccuracy in the count.
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*/
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cnt.v_syscall++;
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sticks = td->td_sticks;
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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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params = (caddr_t)frame.tf_rsp + sizeof(u_int32_t);
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code = frame.tf_rax;
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orig_tf_rflags = frame.tf_rflags;
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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 {
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/*
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* Need to check if this is a 32 bit or 64 bit syscall.
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* fuword is MP aware.
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*/
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if (code == SYS_syscall) {
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/*
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* Code is first argument, followed by actual args.
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*/
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code = fuword32(params);
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params += sizeof(int);
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} else if (code == SYS___syscall) {
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/*
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* Like syscall, but code is a quad, so as to maintain
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* quad alignment for the rest of the arguments.
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* We use a 32-bit fetch in case params is not
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* aligned.
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*/
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code = fuword32(params);
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params += sizeof(quad_t);
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}
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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 & SYF_ARGMASK;
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/*
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* copyin and the ktrsyscall()/ktrsysret() code is MP-aware
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*/
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if (params != NULL && narg != 0)
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error = copyin(params, (caddr_t)args,
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(u_int)(narg * sizeof(int)));
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else
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error = 0;
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for (i = 0; i < narg; i++)
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args64[i] = args[i];
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#ifdef KTRACE
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if (KTRPOINT(td, KTR_SYSCALL))
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ktrsyscall(code, narg, args64);
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#endif
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/*
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* Try to run the syscall without Giant if the syscall
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* is MP safe.
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*/
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if ((callp->sy_narg & SYF_MPSAFE) == 0)
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mtx_lock(&Giant);
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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.tf_rdx;
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STOPEVENT(p, S_SCE, narg);
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error = (*callp->sy_call)(td, args64);
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}
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switch (error) {
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case 0:
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frame.tf_rax = td->td_retval[0];
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frame.tf_rdx = td->td_retval[1];
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frame.tf_rflags &= ~PSL_C;
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break;
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case ERESTART:
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/*
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* Reconstruct pc, assuming lcall $X,y is 7 bytes,
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* int 0x80 is 2 bytes. We saved this in tf_err.
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*/
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frame.tf_rip -= frame.tf_err;
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break;
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case EJUSTRETURN:
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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.tf_rax = error;
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frame.tf_rflags |= PSL_C;
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break;
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}
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/*
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* Release Giant if we previously set it.
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*/
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if ((callp->sy_narg & SYF_MPSAFE) == 0)
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mtx_unlock(&Giant);
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/*
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* Traced syscall.
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*/
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if (orig_tf_rflags & PSL_T) {
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frame.tf_rflags &= ~PSL_T;
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trapsignal(td, SIGTRAP, 0);
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}
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/*
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* Handle reschedule and other end-of-syscall issues
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*/
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userret(td, &frame, sticks);
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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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* This works because errno is findable through the
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* register set. If we ever support an emulation where this
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* is not the case, this code will need to be revisited.
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*/
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STOPEVENT(p, S_SCX, code);
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WITNESS_WARN(WARN_PANIC, NULL, "System call %s returning",
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(code >= 0 && code < SYS_MAXSYSCALL) ? freebsd32_syscallnames[code] : "???");
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mtx_assert(&sched_lock, MA_NOTOWNED);
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mtx_assert(&Giant, MA_NOTOWNED);
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}
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static void
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ia32_syscall_enable(void *dummy)
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{
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setidt(IDT_SYSCALL, &IDTVEC(int0x80_syscall), SDT_SYSIGT, SEL_UPL, 0);
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}
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static void
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ia32_syscall_disable(void *dummy)
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{
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setidt(IDT_SYSCALL, &IDTVEC(rsvd), SDT_SYSIGT, SEL_KPL, 0);
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}
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SYSINIT(ia32_syscall, SI_SUB_EXEC, SI_ORDER_ANY, ia32_syscall_enable, NULL);
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SYSUNINIT(ia32_syscall, SI_SUB_EXEC, SI_ORDER_ANY, ia32_syscall_disable, NULL);
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