284 lines
7.2 KiB
C
284 lines
7.2 KiB
C
/*-
|
|
* SPDX-License-Identifier: BSD-4-Clause
|
|
*
|
|
* 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 <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/proc.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>
|
|
#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>
|
|
|
|
#include <compat/freebsd32/freebsd32_signal.h>
|
|
#include <compat/freebsd32/freebsd32_util.h>
|
|
#include <compat/ia32/ia32_signal.h>
|
|
#include <machine/psl.h>
|
|
#include <machine/segments.h>
|
|
#include <machine/specialreg.h>
|
|
#include <machine/sysarch.h>
|
|
#include <machine/frame.h>
|
|
#include <machine/md_var.h>
|
|
#include <machine/pcb.h>
|
|
#include <machine/cpufunc.h>
|
|
|
|
#define IDTVEC(name) __CONCAT(X,name)
|
|
|
|
extern inthand_t IDTVEC(int0x80_syscall), IDTVEC(int0x80_syscall_pti),
|
|
IDTVEC(rsvd), IDTVEC(rsvd_pti);
|
|
|
|
void ia32_syscall(struct trapframe *frame); /* Called from asm code */
|
|
|
|
void
|
|
ia32_set_syscall_retval(struct thread *td, int error)
|
|
{
|
|
|
|
cpu_set_syscall_retval(td, error);
|
|
}
|
|
|
|
int
|
|
ia32_fetch_syscall_args(struct thread *td)
|
|
{
|
|
struct proc *p;
|
|
struct trapframe *frame;
|
|
struct syscall_args *sa;
|
|
caddr_t params;
|
|
u_int32_t args[8], tmp;
|
|
int error, i;
|
|
#ifdef COMPAT_43
|
|
u_int32_t eip;
|
|
int cs;
|
|
#endif
|
|
|
|
p = td->td_proc;
|
|
frame = td->td_frame;
|
|
sa = &td->td_sa;
|
|
|
|
#ifdef COMPAT_43
|
|
if (__predict_false(frame->tf_cs == 7 && frame->tf_rip == 2)) {
|
|
/*
|
|
* In lcall $7,$0 after int $0x80. Convert the user
|
|
* frame to what it would be for a direct int 0x80 instead
|
|
* of lcall $7,$0, by popping the lcall return address.
|
|
*/
|
|
error = fueword32((void *)frame->tf_rsp, &eip);
|
|
if (error == -1)
|
|
return (EFAULT);
|
|
cs = fuword16((void *)(frame->tf_rsp + sizeof(u_int32_t)));
|
|
if (cs == -1)
|
|
return (EFAULT);
|
|
|
|
/*
|
|
* Unwind in-kernel frame after all stack frame pieces
|
|
* were successfully read.
|
|
*/
|
|
frame->tf_rip = eip;
|
|
frame->tf_cs = cs;
|
|
frame->tf_rsp += 2 * sizeof(u_int32_t);
|
|
frame->tf_err = 7; /* size of lcall $7,$0 */
|
|
}
|
|
#endif
|
|
|
|
params = (caddr_t)frame->tf_rsp + sizeof(u_int32_t);
|
|
sa->code = frame->tf_rax;
|
|
|
|
/*
|
|
* Need to check if this is a 32 bit or 64 bit syscall.
|
|
*/
|
|
if (sa->code == SYS_syscall) {
|
|
/*
|
|
* Code is first argument, followed by actual args.
|
|
*/
|
|
error = fueword32(params, &tmp);
|
|
if (error == -1)
|
|
return (EFAULT);
|
|
sa->code = tmp;
|
|
params += sizeof(int);
|
|
} else if (sa->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.
|
|
*/
|
|
error = fueword32(params, &tmp);
|
|
if (error == -1)
|
|
return (EFAULT);
|
|
sa->code = tmp;
|
|
params += sizeof(quad_t);
|
|
}
|
|
if (sa->code >= p->p_sysent->sv_size)
|
|
sa->callp = &p->p_sysent->sv_table[0];
|
|
else
|
|
sa->callp = &p->p_sysent->sv_table[sa->code];
|
|
sa->narg = sa->callp->sy_narg;
|
|
|
|
if (params != NULL && sa->narg != 0)
|
|
error = copyin(params, (caddr_t)args,
|
|
(u_int)(sa->narg * sizeof(int)));
|
|
else
|
|
error = 0;
|
|
|
|
for (i = 0; i < sa->narg; i++)
|
|
sa->args[i] = args[i];
|
|
|
|
if (error == 0) {
|
|
td->td_retval[0] = 0;
|
|
td->td_retval[1] = frame->tf_rdx;
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
#include "../../kern/subr_syscall.c"
|
|
|
|
void
|
|
ia32_syscall(struct trapframe *frame)
|
|
{
|
|
struct thread *td;
|
|
register_t orig_tf_rflags;
|
|
int error;
|
|
ksiginfo_t ksi;
|
|
|
|
orig_tf_rflags = frame->tf_rflags;
|
|
td = curthread;
|
|
td->td_frame = frame;
|
|
|
|
error = syscallenter(td);
|
|
|
|
/*
|
|
* 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);
|
|
}
|
|
|
|
syscallret(td, error);
|
|
amd64_syscall_ret_flush_l1d(error);
|
|
}
|
|
|
|
static void
|
|
ia32_syscall_enable(void *dummy)
|
|
{
|
|
|
|
setidt(IDT_SYSCALL, pti ? &IDTVEC(int0x80_syscall_pti) :
|
|
&IDTVEC(int0x80_syscall), SDT_SYSIGT, SEL_UPL, 0);
|
|
}
|
|
|
|
static void
|
|
ia32_syscall_disable(void *dummy)
|
|
{
|
|
|
|
setidt(IDT_SYSCALL, pti ? &IDTVEC(rsvd_pti) : &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);
|
|
|
|
#ifdef COMPAT_43
|
|
int
|
|
setup_lcall_gate(void)
|
|
{
|
|
struct i386_ldt_args uap;
|
|
struct user_segment_descriptor desc;
|
|
uint32_t lcall_addr;
|
|
int error;
|
|
|
|
bzero(&uap, sizeof(uap));
|
|
uap.start = 0;
|
|
uap.num = 1;
|
|
lcall_addr = curproc->p_sysent->sv_psstrings - sz_lcall_tramp;
|
|
bzero(&desc, sizeof(desc));
|
|
desc.sd_type = SDT_MEMERA;
|
|
desc.sd_dpl = SEL_UPL;
|
|
desc.sd_p = 1;
|
|
desc.sd_def32 = 1;
|
|
desc.sd_gran = 1;
|
|
desc.sd_lolimit = 0xffff;
|
|
desc.sd_hilimit = 0xf;
|
|
desc.sd_lobase = lcall_addr;
|
|
desc.sd_hibase = lcall_addr >> 24;
|
|
error = amd64_set_ldt(curthread, &uap, &desc);
|
|
if (error != 0)
|
|
return (error);
|
|
|
|
return (0);
|
|
}
|
|
#endif
|