freebsd-dev/sys/ia64/ia32/ia32_trap.c

294 lines
7.1 KiB
C

/*-
* Copyright (c) 2004 Marcel Moolenaar
* All rights reserved.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/ktr.h>
#include <sys/sysproto.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/pioctl.h>
#include <sys/proc.h>
#include <sys/signalvar.h>
#include <sys/syscall.h>
#include <sys/sysent.h>
#include <machine/cpu.h>
#include <machine/fpu.h>
#include <machine/frame.h>
#include <machine/md_var.h>
#include <i386/include/psl.h>
#ifdef WITNESS
extern char *syscallnames[];
#endif
static void
ia32_syscall(struct trapframe *tf)
{
uint64_t args64[8];
uint32_t args[8];
struct thread *td;
struct proc *p;
struct sysent *callp;
caddr_t params;
register_t eflags;
u_int code;
int error, i, narg;
atomic_add_int(&cnt.v_syscall, 1);
td = curthread;
params = (caddr_t)(tf->tf_special.sp & ((1L<<32)-1)) +
sizeof(uint32_t);
code = tf->tf_scratch.gr8; /* eax */
eflags = ia64_get_eflag();
p = td->td_proc;
if (p->p_sysent->sv_prepsyscall == NULL) {
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);
}
} else
(*p->p_sysent->sv_prepsyscall)(tf, args, &code, &params);
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 & SYF_ARGMASK;
/* copyin and the ktrsyscall()/ktrsysret() code is MP-aware */
if (params != NULL && narg != 0)
error = copyin(params, (caddr_t)args, 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
/*
* Try to run the syscall without Giant if the syscall
* is MP safe.
*/
if ((callp->sy_narg & SYF_MPSAFE) == 0)
mtx_lock(&Giant);
if (error == 0) {
td->td_retval[0] = 0;
td->td_retval[1] = tf->tf_scratch.gr10; /* edx */
STOPEVENT(p, S_SCE, narg);
error = (*callp->sy_call)(td, args64);
}
switch (error) {
case 0:
tf->tf_scratch.gr8 = td->td_retval[0]; /* eax */
tf->tf_scratch.gr10 = td->td_retval[1]; /* edx */
ia64_set_eflag(ia64_get_eflag() & ~PSL_C);
break;
case ERESTART:
/*
* Reconstruct pc, assuming lcall $X,y is 7 bytes,
* int 0x80 is 2 bytes. XXX Assume int 0x80.
*/
tf->tf_special.iip -= 2;
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];
}
tf->tf_scratch.gr8 = error;
ia64_set_eflag(ia64_get_eflag() | PSL_C);
break;
}
/*
* Release Giant if we previously set it.
*/
if ((callp->sy_narg & SYF_MPSAFE) == 0)
mtx_unlock(&Giant);
/*
* Traced syscall.
*/
if ((eflags & PSL_T) && !(eflags & PSL_VM)) {
ia64_set_eflag(ia64_get_eflag() & ~PSL_T);
trapsignal(td, SIGTRAP, 0);
}
#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);
WITNESS_WARN(WARN_PANIC, NULL, "System call %s returning",
(code >= 0 && code < SYS_MAXSYSCALL) ? syscallnames[code] : "???");
mtx_assert(&sched_lock, MA_NOTOWNED);
mtx_assert(&Giant, MA_NOTOWNED);
}
/*
* ia32_trap() is called from exception.S to handle the IA-32 specific
* interruption vectors.
*/
void
ia32_trap(int vector, struct trapframe *tf)
{
struct proc *p;
struct thread *td;
uint64_t ucode;
int sig;
u_int sticks;
KASSERT(TRAPF_USERMODE(tf), ("%s: In kernel mode???", __func__));
ia64_set_fpsr(IA64_FPSR_DEFAULT);
atomic_add_int(&cnt.v_trap, 1);
td = curthread;
td->td_frame = tf;
sticks = td->td_sticks;
p = td->td_proc;
if (td->td_ucred != p->p_ucred)
cred_update_thread(td);
sig = 0;
ucode = 0;
switch (vector) {
case IA64_VEC_IA32_EXCEPTION:
switch ((tf->tf_special.isr >> 16) & 0xffff) {
case IA32_EXCEPTION_DIVIDE:
ucode = FPE_INTDIV;
sig = SIGFPE;
break;
case IA32_EXCEPTION_DEBUG:
case IA32_EXCEPTION_BREAK:
sig = SIGTRAP;
break;
case IA32_EXCEPTION_OVERFLOW:
ucode = FPE_INTOVF;
sig = SIGFPE;
break;
case IA32_EXCEPTION_BOUND:
ucode = FPE_FLTSUB;
sig = SIGFPE;
break;
case IA32_EXCEPTION_DNA:
ucode = 0;
sig = SIGFPE;
break;
case IA32_EXCEPTION_NOT_PRESENT:
case IA32_EXCEPTION_STACK_FAULT:
case IA32_EXCEPTION_GPFAULT:
ucode = (tf->tf_special.isr & 0xffff) + BUS_SEGM_FAULT;
sig = SIGBUS;
break;
case IA32_EXCEPTION_FPERROR:
ucode = 0; /* XXX */
sig = SIGFPE;
break;
case IA32_EXCEPTION_ALIGNMENT_CHECK:
ucode = tf->tf_special.ifa; /* VA */
sig = SIGBUS;
break;
case IA32_EXCEPTION_STREAMING_SIMD:
ucode = 0; /* XXX */
sig = SIGFPE;
break;
default:
trap_panic(vector, tf);
break;
}
break;
case IA64_VEC_IA32_INTERCEPT:
/* XXX Maybe need to emulate ia32 instruction. */
trap_panic(vector, tf);
case IA64_VEC_IA32_INTERRUPT:
/* INT n instruction - probably a syscall. */
if (((tf->tf_special.isr >> 16) & 0xffff) == 0x80) {
ia32_syscall(tf);
goto out;
}
ucode = (tf->tf_special.isr >> 16) & 0xffff;
sig = SIGILL;
break;
default:
/* Should never happen of course. */
trap_panic(vector, tf);
break;
}
KASSERT(sig != 0, ("%s: signal not set", __func__));
trapsignal(td, sig, ucode);
out:
userret(td, tf, sticks);
mtx_assert(&Giant, MA_NOTOWNED);
do_ast(tf);
}