mirror of
https://git.hardenedbsd.org/hardenedbsd/HardenedBSD.git
synced 2024-11-24 00:41:06 +01:00
26ccf4f10f
by the syscall entry speed microbenchmarks by ~10% on amd64. Submitted by: jhb Approved by: re (bz) MFC after: 2 weeks
284 lines
6.6 KiB
C
284 lines
6.6 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/ptrace.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>
|
|
|
|
#include <security/audit/audit.h>
|
|
|
|
#include <compat/ia32/ia32_util.h>
|
|
|
|
void
|
|
ia32_set_syscall_retval(struct thread *td, int error)
|
|
{
|
|
struct proc *p;
|
|
struct trapframe *tf;
|
|
|
|
tf = td->td_frame;
|
|
|
|
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:
|
|
p = td->td_proc;
|
|
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;
|
|
}
|
|
}
|
|
|
|
int
|
|
ia32_fetch_syscall_args(struct thread *td, struct syscall_args *sa)
|
|
{
|
|
struct trapframe *tf;
|
|
struct proc *p;
|
|
uint32_t args[8];
|
|
caddr_t params;
|
|
int error, i;
|
|
|
|
tf = td->td_frame;
|
|
p = td->td_proc;
|
|
|
|
params = (caddr_t)(tf->tf_special.sp & ((1L<<32)-1)) +
|
|
sizeof(uint32_t);
|
|
sa->code = tf->tf_scratch.gr8; /* eax */
|
|
|
|
if (sa->code == SYS_syscall) {
|
|
/* Code is first argument, followed by actual args. */
|
|
sa->code = fuword32(params);
|
|
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.
|
|
*/
|
|
sa->code = fuword32(params);
|
|
params += sizeof(quad_t);
|
|
}
|
|
|
|
if (p->p_sysent->sv_mask)
|
|
sa->code &= p->p_sysent->sv_mask;
|
|
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, sa->narg * sizeof(int));
|
|
else
|
|
error = 0;
|
|
sa->args = &sa->args32[0];
|
|
|
|
if (error == 0) {
|
|
for (i = 0; i < sa->narg; i++)
|
|
sa->args32[i] = args[i];
|
|
td->td_retval[0] = 0;
|
|
td->td_retval[1] = tf->tf_scratch.gr10; /* edx */
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
#include "../../kern/subr_syscall.c"
|
|
|
|
static void
|
|
ia32_syscall(struct trapframe *tf)
|
|
{
|
|
struct thread *td;
|
|
struct syscall_args sa;
|
|
register_t eflags;
|
|
int error;
|
|
ksiginfo_t ksi;
|
|
|
|
td = curthread;
|
|
eflags = ia64_get_eflag();
|
|
|
|
error = syscallenter(td, &sa);
|
|
|
|
/*
|
|
* 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);
|
|
}
|
|
|
|
syscallret(td, error, &sa);
|
|
}
|
|
|
|
/*
|
|
* 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_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);
|
|
}
|