285 lines
7.5 KiB
C
285 lines
7.5 KiB
C
/*-
|
|
* Copyright (C) 1994, David Greenman
|
|
* Copyright (c) 1990, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to Berkeley by
|
|
* the University of Utah, and William Jolitz.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
/*
|
|
* 386 Trap and System call handling
|
|
*/
|
|
|
|
#include "opt_clock.h"
|
|
#include "opt_cpu.h"
|
|
#include "opt_isa.h"
|
|
#include "opt_ktrace.h"
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/bus.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/pioctl.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/ktr.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/mutex.h>
|
|
#include <sys/ptrace.h>
|
|
#include <sys/resourcevar.h>
|
|
#include <sys/signalvar.h>
|
|
#include <sys/syscall.h>
|
|
#include <sys/sysctl.h>
|
|
#include <sys/sysent.h>
|
|
#include <sys/uio.h>
|
|
#include <sys/vmmeter.h>
|
|
#ifdef KTRACE
|
|
#include <sys/ktrace.h>
|
|
#endif
|
|
#include <security/audit/audit.h>
|
|
|
|
#include <vm/vm.h>
|
|
#include <vm/vm_param.h>
|
|
#include <vm/pmap.h>
|
|
#include <vm/vm_kern.h>
|
|
#include <vm/vm_map.h>
|
|
#include <vm/vm_page.h>
|
|
#include <vm/vm_extern.h>
|
|
|
|
#include <machine/cpu.h>
|
|
#include <machine/intr_machdep.h>
|
|
#include <machine/md_var.h>
|
|
|
|
#define IDTVEC(name) __CONCAT(X,name)
|
|
|
|
extern inthand_t IDTVEC(int0x80_syscall), IDTVEC(rsvd);
|
|
extern const char *freebsd32_syscallnames[];
|
|
|
|
void ia32_syscall(struct trapframe frame); /* Called from asm code */
|
|
|
|
void
|
|
ia32_syscall(struct trapframe frame)
|
|
{
|
|
caddr_t params;
|
|
int i;
|
|
struct sysent *callp;
|
|
struct thread *td = curthread;
|
|
struct proc *p = td->td_proc;
|
|
register_t orig_tf_rflags;
|
|
int error;
|
|
int narg;
|
|
u_int32_t args[8];
|
|
u_int64_t args64[8];
|
|
u_int code;
|
|
ksiginfo_t ksi;
|
|
|
|
/*
|
|
* note: PCPU_LAZY_INC() can only be used if we can afford
|
|
* occassional inaccuracy in the count.
|
|
*/
|
|
PCPU_LAZY_INC(cnt.v_syscall);
|
|
|
|
td->td_pticks = 0;
|
|
td->td_frame = &frame;
|
|
if (td->td_ucred != p->p_ucred)
|
|
cred_update_thread(td);
|
|
params = (caddr_t)frame.tf_rsp + sizeof(u_int32_t);
|
|
code = frame.tf_rax;
|
|
orig_tf_rflags = frame.tf_rflags;
|
|
|
|
if (p->p_sysent->sv_prepsyscall) {
|
|
/*
|
|
* The prep code is MP aware.
|
|
*/
|
|
(*p->p_sysent->sv_prepsyscall)(&frame, args, &code, ¶ms);
|
|
} else {
|
|
/*
|
|
* Need to check if this is a 32 bit or 64 bit syscall.
|
|
* fuword is MP aware.
|
|
*/
|
|
if (code == SYS_syscall) {
|
|
/*
|
|
* Code is first argument, followed by actual args.
|
|
*/
|
|
code = fuword32(params);
|
|
params += sizeof(int);
|
|
} else if (code == SYS___syscall) {
|
|
/*
|
|
* Like syscall, but code is a quad, so as to maintain
|
|
* quad alignment for the rest of the arguments.
|
|
* We use a 32-bit fetch in case params is not
|
|
* aligned.
|
|
*/
|
|
code = fuword32(params);
|
|
params += sizeof(quad_t);
|
|
}
|
|
}
|
|
|
|
if (p->p_sysent->sv_mask)
|
|
code &= p->p_sysent->sv_mask;
|
|
|
|
if (code >= p->p_sysent->sv_size)
|
|
callp = &p->p_sysent->sv_table[0];
|
|
else
|
|
callp = &p->p_sysent->sv_table[code];
|
|
|
|
narg = callp->sy_narg;
|
|
|
|
/*
|
|
* copyin and the ktrsyscall()/ktrsysret() code is MP-aware
|
|
*/
|
|
if (params != NULL && narg != 0)
|
|
error = copyin(params, (caddr_t)args,
|
|
(u_int)(narg * sizeof(int)));
|
|
else
|
|
error = 0;
|
|
|
|
for (i = 0; i < narg; i++)
|
|
args64[i] = args[i];
|
|
|
|
#ifdef KTRACE
|
|
if (KTRPOINT(td, KTR_SYSCALL))
|
|
ktrsyscall(code, narg, args64);
|
|
#endif
|
|
CTR4(KTR_SYSC, "syscall enter thread %p pid %d proc %s code %d", td,
|
|
td->td_proc->p_pid, td->td_proc->p_comm, code);
|
|
|
|
if (error == 0) {
|
|
td->td_retval[0] = 0;
|
|
td->td_retval[1] = frame.tf_rdx;
|
|
|
|
STOPEVENT(p, S_SCE, narg);
|
|
|
|
PTRACESTOP_SC(p, td, S_PT_SCE);
|
|
|
|
AUDIT_SYSCALL_ENTER(code, td);
|
|
error = (*callp->sy_call)(td, args64);
|
|
AUDIT_SYSCALL_EXIT(error, td);
|
|
}
|
|
|
|
switch (error) {
|
|
case 0:
|
|
frame.tf_rax = td->td_retval[0];
|
|
frame.tf_rdx = td->td_retval[1];
|
|
frame.tf_rflags &= ~PSL_C;
|
|
break;
|
|
|
|
case ERESTART:
|
|
/*
|
|
* Reconstruct pc, assuming lcall $X,y is 7 bytes,
|
|
* int 0x80 is 2 bytes. We saved this in tf_err.
|
|
*/
|
|
frame.tf_rip -= frame.tf_err;
|
|
break;
|
|
|
|
case EJUSTRETURN:
|
|
break;
|
|
|
|
default:
|
|
if (p->p_sysent->sv_errsize) {
|
|
if (error >= p->p_sysent->sv_errsize)
|
|
error = -1; /* XXX */
|
|
else
|
|
error = p->p_sysent->sv_errtbl[error];
|
|
}
|
|
frame.tf_rax = error;
|
|
frame.tf_rflags |= PSL_C;
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* Traced syscall.
|
|
*/
|
|
if (orig_tf_rflags & PSL_T) {
|
|
frame.tf_rflags &= ~PSL_T;
|
|
ksiginfo_init_trap(&ksi);
|
|
ksi.ksi_signo = SIGTRAP;
|
|
ksi.ksi_code = TRAP_TRACE;
|
|
ksi.ksi_addr = (void *)frame.tf_rip;
|
|
trapsignal(td, &ksi);
|
|
}
|
|
|
|
/*
|
|
* Check for misbehavior.
|
|
*/
|
|
WITNESS_WARN(WARN_PANIC, NULL, "System call %s returning",
|
|
(code >= 0 && code < SYS_MAXSYSCALL) ? freebsd32_syscallnames[code] : "???");
|
|
KASSERT(td->td_critnest == 0,
|
|
("System call %s returning in a critical section",
|
|
(code >= 0 && code < SYS_MAXSYSCALL) ? freebsd32_syscallnames[code] : "???"));
|
|
KASSERT(td->td_locks == 0,
|
|
("System call %s returning with %d locks held",
|
|
(code >= 0 && code < SYS_MAXSYSCALL) ? freebsd32_syscallnames[code] : "???",
|
|
td->td_locks));
|
|
|
|
/*
|
|
* Handle reschedule and other end-of-syscall issues
|
|
*/
|
|
userret(td, &frame);
|
|
|
|
CTR4(KTR_SYSC, "syscall exit thread %p pid %d proc %s code %d", td,
|
|
td->td_proc->p_pid, td->td_proc->p_comm, code);
|
|
#ifdef KTRACE
|
|
if (KTRPOINT(td, KTR_SYSRET))
|
|
ktrsysret(code, error, td->td_retval[0]);
|
|
#endif
|
|
|
|
/*
|
|
* This works because errno is findable through the
|
|
* register set. If we ever support an emulation where this
|
|
* is not the case, this code will need to be revisited.
|
|
*/
|
|
STOPEVENT(p, S_SCX, code);
|
|
|
|
PTRACESTOP_SC(p, td, S_PT_SCX);
|
|
}
|
|
|
|
|
|
static void
|
|
ia32_syscall_enable(void *dummy)
|
|
{
|
|
|
|
setidt(IDT_SYSCALL, &IDTVEC(int0x80_syscall), SDT_SYSIGT, SEL_UPL, 0);
|
|
}
|
|
|
|
static void
|
|
ia32_syscall_disable(void *dummy)
|
|
{
|
|
|
|
setidt(IDT_SYSCALL, &IDTVEC(rsvd), SDT_SYSIGT, SEL_KPL, 0);
|
|
}
|
|
|
|
SYSINIT(ia32_syscall, SI_SUB_EXEC, SI_ORDER_ANY, ia32_syscall_enable, NULL);
|
|
SYSUNINIT(ia32_syscall, SI_SUB_EXEC, SI_ORDER_ANY, ia32_syscall_disable, NULL);
|