eb2da9a51f
Rename struct thread's td_sticks to td_pticks, we will need the other name for more appropriately named use shortly. Reduce it from uint64_t to u_int. Clear td_pticks whenever we enter the kernel instead of recording its value as reference for userret(). Use the absolute value of td->pticks in userret() and eliminate third argument.
303 lines
7.3 KiB
C
303 lines
7.3 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;
|
|
ksiginfo_t ksi;
|
|
|
|
PCPU_LAZY_INC(cnt.v_syscall);
|
|
|
|
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, ¶ms);
|
|
|
|
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);
|
|
ksiginfo_init_trap(&ksi);
|
|
ksi.ksi_signo = SIGTRAP;
|
|
ksi.ksi_code = TRAP_TRACE;
|
|
ksi.ksi_addr = (void *)tf->tf_special.iip;
|
|
trapsignal(td, &ksi);
|
|
}
|
|
|
|
#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;
|
|
ksiginfo_t ksi;
|
|
|
|
KASSERT(TRAPF_USERMODE(tf), ("%s: In kernel mode???", __func__));
|
|
|
|
ia64_set_fpsr(IA64_FPSR_DEFAULT);
|
|
PCPU_LAZY_INC(cnt.v_trap);
|
|
|
|
td = curthread;
|
|
td->td_frame = tf;
|
|
td->td_pticks = 0;
|
|
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__));
|
|
|
|
ksiginfo_init_trap(&ksi);
|
|
ksi.ksi_signo = sig;
|
|
ksi.ksi_code = (int)ucode; /* XXX */
|
|
/* ksi.ksi_addr */
|
|
trapsignal(td, &ksi);
|
|
|
|
out:
|
|
userret(td, tf);
|
|
mtx_assert(&Giant, MA_NOTOWNED);
|
|
do_ast(tf);
|
|
}
|