FreeBSD/Linux Kernel Cross Reference
sys/amd64/ia32/ia32_syscall.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: releng/8.4/sys/amd64/ia32/ia32_syscall.c 225855 2011-09-29 00:39:56Z kib $");
    
    /*
     * 386 Trap and System call handling
     */
    
    #include "opt_clock.h"
    #include "opt_cpu.h"
    #include "opt_isa.h"
    #include "opt_ktrace.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>
    #ifdef KTRACE
    #include <sys/ktrace.h>
    #endif
    #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_util.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 syscall_args *sa)
   {
           struct proc *p;
           struct trapframe *frame;
           caddr_t params;
           u_int32_t args[8];
           int error, i;
   
           p = td->td_proc;
           frame = td->td_frame;
   
           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.
                    */
                   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,
                       (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;
           struct syscall_args sa;
           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, &sa);
   
           /*
            * 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, &sa);
   }
   
   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);

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