ia32_syscall.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-4-Clause
    3  *
    4  * Copyright (C) 1994, David Greenman
    5  * Copyright (c) 1990, 1993
    6  *      The Regents of the University of California.  All rights reserved.
    7  *
    8  * This code is derived from software contributed to Berkeley by
    9  * the University of Utah, and William Jolitz.
   10  *
   11  * Redistribution and use in source and binary forms, with or without
   12  * modification, are permitted provided that the following conditions
   13  * are met:
   14  * 1. Redistributions of source code must retain the above copyright
   15  *    notice, this list of conditions and the following disclaimer.
   16  * 2. Redistributions in binary form must reproduce the above copyright
   17  *    notice, this list of conditions and the following disclaimer in the
   18  *    documentation and/or other materials provided with the distribution.
   19  * 3. All advertising materials mentioning features or use of this software
   20  *    must display the following acknowledgement:
   21  *      This product includes software developed by the University of
   22  *      California, Berkeley and its contributors.
   23  * 4. Neither the name of the University nor the names of its contributors
   24  *    may be used to endorse or promote products derived from this software
   25  *    without specific prior written permission.
   26  *
   27  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   28  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   29  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   30  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   31  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   32  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   33  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   34  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   35  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   36  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   37  * SUCH DAMAGE.
   38  */
   39 
   40 #include <sys/cdefs.h>
   41 __FBSDID("$FreeBSD$");
   42 
   43 /*
   44  * 386 Trap and System call handling
   45  */
   46 
   47 #include "opt_clock.h"
   48 #include "opt_cpu.h"
   49 #include "opt_isa.h"
   50 
   51 #include <sys/param.h>
   52 #include <sys/bus.h>
   53 #include <sys/systm.h>
   54 #include <sys/proc.h>
   55 #include <sys/kernel.h>
   56 #include <sys/ktr.h>
   57 #include <sys/lock.h>
   58 #include <sys/msan.h>
   59 #include <sys/mutex.h>
   60 #include <sys/proc.h>
   61 #include <sys/ptrace.h>
   62 #include <sys/resourcevar.h>
   63 #include <sys/signalvar.h>
   64 #include <sys/syscall.h>
   65 #include <sys/sysctl.h>
   66 #include <sys/sysent.h>
   67 #include <sys/uio.h>
   68 #include <sys/vmmeter.h>
   69 #include <security/audit/audit.h>
   70 
   71 #include <vm/vm.h>
   72 #include <vm/vm_param.h>
   73 #include <vm/pmap.h>
   74 #include <vm/vm_kern.h>
   75 #include <vm/vm_map.h>
   76 #include <vm/vm_page.h>
   77 #include <vm/vm_extern.h>
   78 
   79 #include <machine/cpu.h>
   80 #include <machine/intr_machdep.h>
   81 #include <machine/md_var.h>
   82 
   83 #include <compat/freebsd32/freebsd32_signal.h>
   84 #include <compat/freebsd32/freebsd32_util.h>
   85 #include <compat/ia32/ia32_signal.h>
   86 #include <machine/psl.h>
   87 #include <machine/segments.h>
   88 #include <machine/specialreg.h>
   89 #include <machine/sysarch.h>
   90 #include <machine/frame.h>
   91 #include <machine/md_var.h>
   92 #include <machine/pcb.h>
   93 #include <machine/cpufunc.h>
   94 
   95 #include "vdso_ia32_offsets.h"
   96 
   97 extern const char _binary_elf_vdso32_so_1_start[];
   98 extern const char _binary_elf_vdso32_so_1_end[];
   99 extern char _binary_elf_vdso32_so_1_size;
  100 
  101 #define IDTVEC(name)    __CONCAT(X,name)
  102 
  103 extern inthand_t IDTVEC(int0x80_syscall), IDTVEC(int0x80_syscall_pti),
  104     IDTVEC(rsvd), IDTVEC(rsvd_pti);
  105 
  106 void ia32_syscall(struct trapframe *frame);     /* Called from asm code */
  107 
  108 void
  109 ia32_set_syscall_retval(struct thread *td, int error)
  110 {
  111 
  112         cpu_set_syscall_retval(td, error);
  113 }
  114 
  115 int
  116 ia32_fetch_syscall_args(struct thread *td)
  117 {
  118         struct proc *p;
  119         struct trapframe *frame;
  120         struct syscall_args *sa;
  121         caddr_t params;
  122         u_int32_t args[8], tmp;
  123         int error, i;
  124 #ifdef COMPAT_43
  125         u_int32_t eip;
  126         int cs;
  127 #endif
  128 
  129         p = td->td_proc;
  130         frame = td->td_frame;
  131         sa = &td->td_sa;
  132 
  133 #ifdef COMPAT_43
  134         if (__predict_false(frame->tf_cs == 7 && frame->tf_rip == 2)) {
  135                 /*
  136                  * In lcall $7,$0 after int $0x80.  Convert the user
  137                  * frame to what it would be for a direct int 0x80 instead
  138                  * of lcall $7,$0, by popping the lcall return address.
  139                  */
  140                 error = fueword32((void *)frame->tf_rsp, &eip);
  141                 if (error == -1)
  142                         return (EFAULT);
  143                 cs = fuword16((void *)(frame->tf_rsp + sizeof(u_int32_t)));
  144                 if (cs == -1)
  145                         return (EFAULT);
  146 
  147                 /*
  148                  * Unwind in-kernel frame after all stack frame pieces
  149                  * were successfully read.
  150                  */
  151                 frame->tf_rip = eip;
  152                 frame->tf_cs = cs;
  153                 frame->tf_rsp += 2 * sizeof(u_int32_t);
  154                 frame->tf_err = 7;              /* size of lcall $7,$0 */
  155         }
  156 #endif
  157 
  158         params = (caddr_t)frame->tf_rsp + sizeof(u_int32_t);
  159         sa->code = frame->tf_rax;
  160         sa->original_code = sa->code;
  161 
  162         /*
  163          * Need to check if this is a 32 bit or 64 bit syscall.
  164          */
  165         if (sa->code == SYS_syscall) {
  166                 /*
  167                  * Code is first argument, followed by actual args.
  168                  */
  169                 error = fueword32(params, &tmp);
  170                 if (error == -1)
  171                         return (EFAULT);
  172                 sa->code = tmp;
  173                 params += sizeof(int);
  174         } else if (sa->code == SYS___syscall) {
  175                 /*
  176                  * Like syscall, but code is a quad, so as to maintain
  177                  * quad alignment for the rest of the arguments.
  178                  * We use a 32-bit fetch in case params is not
  179                  * aligned.
  180                  */
  181                 error = fueword32(params, &tmp);
  182                 if (error == -1)
  183                         return (EFAULT);
  184                 sa->code = tmp;
  185                 params += sizeof(quad_t);
  186         }
  187         if (sa->code >= p->p_sysent->sv_size)
  188                 sa->callp = &p->p_sysent->sv_table[0];
  189         else
  190                 sa->callp = &p->p_sysent->sv_table[sa->code];
  191 
  192         if (params != NULL && sa->callp->sy_narg != 0)
  193                 error = copyin(params, (caddr_t)args,
  194                     (u_int)(sa->callp->sy_narg * sizeof(int)));
  195         else
  196                 error = 0;
  197 
  198         for (i = 0; i < sa->callp->sy_narg; i++)
  199                 sa->args[i] = args[i];
  200 
  201         if (error == 0) {
  202                 td->td_retval[0] = 0;
  203                 td->td_retval[1] = frame->tf_rdx;
  204         }
  205 
  206         return (error);
  207 }
  208 
  209 #include "../../kern/subr_syscall.c"
  210 
  211 void
  212 ia32_syscall(struct trapframe *frame)
  213 {
  214         struct thread *td;
  215         register_t orig_tf_rflags;
  216         ksiginfo_t ksi;
  217 
  218         kmsan_mark(frame, sizeof(*frame), KMSAN_STATE_INITED);
  219 
  220         orig_tf_rflags = frame->tf_rflags;
  221         td = curthread;
  222         td->td_frame = frame;
  223 
  224         syscallenter(td);
  225 
  226         /*
  227          * Traced syscall.
  228          */
  229         if (orig_tf_rflags & PSL_T) {
  230                 frame->tf_rflags &= ~PSL_T;
  231                 ksiginfo_init_trap(&ksi);
  232                 ksi.ksi_signo = SIGTRAP;
  233                 ksi.ksi_code = TRAP_TRACE;
  234                 ksi.ksi_addr = (void *)frame->tf_rip;
  235                 trapsignal(td, &ksi);
  236         }
  237 
  238         syscallret(td);
  239         amd64_syscall_ret_flush_l1d(td->td_errno);
  240 }
  241 
  242 static void
  243 ia32_syscall_enable(void *dummy)
  244 {
  245 
  246         setidt(IDT_SYSCALL, pti ? &IDTVEC(int0x80_syscall_pti) :
  247             &IDTVEC(int0x80_syscall), SDT_SYSIGT, SEL_UPL, 0);
  248 }
  249 
  250 static void
  251 ia32_syscall_disable(void *dummy)
  252 {
  253 
  254         setidt(IDT_SYSCALL, pti ? &IDTVEC(rsvd_pti) : &IDTVEC(rsvd),
  255             SDT_SYSIGT, SEL_KPL, 0);
  256 }
  257 
  258 SYSINIT(ia32_syscall, SI_SUB_EXEC, SI_ORDER_ANY, ia32_syscall_enable, NULL);
  259 SYSUNINIT(ia32_syscall, SI_SUB_EXEC, SI_ORDER_ANY, ia32_syscall_disable, NULL);
  260 
  261 #ifdef COMPAT_43
  262 int
  263 setup_lcall_gate(void)
  264 {
  265         struct i386_ldt_args uap;
  266         struct user_segment_descriptor desc;
  267         uint32_t lcall_addr;
  268         int error;
  269 
  270         bzero(&uap, sizeof(uap));
  271         uap.start = 0;
  272         uap.num = 1;
  273         lcall_addr = PROC_PS_STRINGS(curproc) -
  274             (_binary_elf_vdso32_so_1_end - _binary_elf_vdso32_so_1_start) +
  275             VDSO_LCALL_TRAMP_OFFSET;
  276         bzero(&desc, sizeof(desc));
  277         desc.sd_type = SDT_MEMERA;
  278         desc.sd_dpl = SEL_UPL;
  279         desc.sd_p = 1;
  280         desc.sd_def32 = 1;
  281         desc.sd_gran = 1;
  282         desc.sd_lolimit = 0xffff;
  283         desc.sd_hilimit = 0xf;
  284         desc.sd_lobase = lcall_addr;
  285         desc.sd_hibase = lcall_addr >> 24;
  286         error = amd64_set_ldt(curthread, &uap, &desc);
  287         if (error != 0)
  288                 return (error);
  289 
  290         return (0);
  291 }
  292 #endif

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FreeBSD/Linux Kernel Cross Reference sys/amd64/ia32/ia32_syscall.c

FreeBSD/Linux Kernel Cross Reference
sys/amd64/ia32/ia32_syscall.c