2d88da2f06
struct thread. For all architectures, the syscall trap handlers have to allocate the structure on the stack. The structure takes 88 bytes on 64bit arches which is not negligible. Also, it cannot be easily found by other code, which e.g. caused duplication of some members of the structure to struct thread already. The change removes td_dbg_sc_code and td_dbg_sc_nargs which were directly copied from syscall_args. The structure is put into the copied on fork part of the struct thread to make the syscall arguments information correct in the child after fork. This move will also allow several more uses shortly. Reviewed by: jhb (previous version) Sponsored by: The FreeBSD Foundation MFC after: 3 weeks X-Differential revision: https://reviews.freebsd.org/D11080
252 lines
6.4 KiB
C
252 lines
6.4 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_compat.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(rsvd);
|
|
|
|
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;
|
|
|
|
p = td->td_proc;
|
|
frame = td->td_frame;
|
|
sa = &td->td_sa;
|
|
|
|
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 (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,
|
|
(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);
|
|
}
|
|
|
|
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);
|
|
|
|
#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
|