afe1a68827
Extend struct sysvec with three new elements: sv_fetch_syscall_args - the method to fetch syscall arguments from usermode into struct syscall_args. The structure is machine-depended (this might be reconsidered after all architectures are converted). sv_set_syscall_retval - the method to set a return value for usermode from the syscall. It is a generalization of cpu_set_syscall_retval(9) to allow ABIs to override the way to set a return value. sv_syscallnames - the table of syscall names. Use sv_set_syscall_retval in kern_sigsuspend() instead of hardcoding the call to cpu_set_syscall_retval(). The new functions syscallenter(9) and syscallret(9) are provided that use sv_*syscall* pointers and contain the common repeated code from the syscall() implementations for the architecture-specific syscall trap handlers. Syscallenter() fetches arguments, calls syscall implementation from ABI sysent table, and set up return frame. The end of syscall bookkeeping is done by syscallret(). Take advantage of single place for MI syscall handling code and implement ptrace_lwpinfo pl_flags PL_FLAG_SCE, PL_FLAG_SCX and PL_FLAG_EXEC. The SCE and SCX flags notify the debugger that the thread is stopped at syscall entry or return point respectively. The EXEC flag augments SCX and notifies debugger that the process address space was changed by one of exec(2)-family syscalls. The i386, amd64, sparc64, sun4v, powerpc and ia64 syscall()s are changed to use syscallenter()/syscallret(). MIPS and arm are not converted and use the mostly unchanged syscall() implementation. Reviewed by: jhb, marcel, marius, nwhitehorn, stas Tested by: marcel (ia64), marius (sparc64), nwhitehorn (powerpc), stas (mips) MFC after: 1 month
205 lines
5.4 KiB
C
205 lines
5.4 KiB
C
/*-
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* Copyright (C) 1994, David Greenman
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* the University of Utah, and William Jolitz.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* 386 Trap and System call handling
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*/
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#include "opt_clock.h"
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#include "opt_cpu.h"
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#include "opt_isa.h"
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#include "opt_ktrace.h"
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#include <sys/param.h>
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#include <sys/bus.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <sys/pioctl.h>
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#include <sys/kernel.h>
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#include <sys/ktr.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/proc.h>
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#include <sys/ptrace.h>
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#include <sys/resourcevar.h>
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#include <sys/signalvar.h>
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#include <sys/syscall.h>
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#include <sys/sysctl.h>
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#include <sys/sysent.h>
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#include <sys/uio.h>
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#include <sys/vmmeter.h>
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#ifdef KTRACE
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#include <sys/ktrace.h>
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#endif
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#include <security/audit/audit.h>
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#include <vm/vm.h>
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#include <vm/vm_param.h>
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#include <vm/pmap.h>
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#include <vm/vm_kern.h>
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#include <vm/vm_map.h>
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#include <vm/vm_page.h>
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#include <vm/vm_extern.h>
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#include <machine/cpu.h>
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#include <machine/intr_machdep.h>
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#include <machine/md_var.h>
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#include <compat/freebsd32/freebsd32_util.h>
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#define IDTVEC(name) __CONCAT(X,name)
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extern inthand_t IDTVEC(int0x80_syscall), IDTVEC(rsvd);
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void ia32_syscall(struct trapframe *frame); /* Called from asm code */
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void
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ia32_set_syscall_retval(struct thread *td, int error)
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{
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cpu_set_syscall_retval(td, error);
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}
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int
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ia32_fetch_syscall_args(struct thread *td, struct syscall_args *sa)
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{
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struct proc *p;
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struct trapframe *frame;
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caddr_t params;
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u_int32_t args[8];
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int error, i;
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p = td->td_proc;
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frame = td->td_frame;
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params = (caddr_t)frame->tf_rsp + sizeof(u_int32_t);
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sa->code = frame->tf_rax;
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/*
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* Need to check if this is a 32 bit or 64 bit syscall.
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*/
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if (sa->code == SYS_syscall) {
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/*
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* Code is first argument, followed by actual args.
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*/
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sa->code = fuword32(params);
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params += sizeof(int);
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} else if (sa->code == SYS___syscall) {
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/*
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* Like syscall, but code is a quad, so as to maintain
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* quad alignment for the rest of the arguments.
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* We use a 32-bit fetch in case params is not
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* aligned.
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*/
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sa->code = fuword32(params);
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params += sizeof(quad_t);
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}
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if (p->p_sysent->sv_mask)
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sa->code &= p->p_sysent->sv_mask;
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if (sa->code >= p->p_sysent->sv_size)
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sa->callp = &p->p_sysent->sv_table[0];
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else
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sa->callp = &p->p_sysent->sv_table[sa->code];
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sa->narg = sa->callp->sy_narg;
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if (params != NULL && sa->narg != 0)
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error = copyin(params, (caddr_t)args,
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(u_int)(sa->narg * sizeof(int)));
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else
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error = 0;
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for (i = 0; i < sa->narg; i++)
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sa->args[i] = args[i];
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if (error == 0) {
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td->td_retval[0] = 0;
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td->td_retval[1] = frame->tf_rdx;
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}
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return (error);
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}
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void
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ia32_syscall(struct trapframe *frame)
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{
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struct thread *td;
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struct syscall_args sa;
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register_t orig_tf_rflags;
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int error;
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ksiginfo_t ksi;
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orig_tf_rflags = frame->tf_rflags;
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td = curthread;
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td->td_frame = frame;
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error = syscallenter(td, &sa);
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/*
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* Traced syscall.
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*/
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if (orig_tf_rflags & PSL_T) {
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frame->tf_rflags &= ~PSL_T;
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ksiginfo_init_trap(&ksi);
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ksi.ksi_signo = SIGTRAP;
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ksi.ksi_code = TRAP_TRACE;
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ksi.ksi_addr = (void *)frame->tf_rip;
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trapsignal(td, &ksi);
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}
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syscallret(td, error, &sa);
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}
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static void
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ia32_syscall_enable(void *dummy)
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{
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setidt(IDT_SYSCALL, &IDTVEC(int0x80_syscall), SDT_SYSIGT, SEL_UPL, 0);
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}
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static void
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ia32_syscall_disable(void *dummy)
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{
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setidt(IDT_SYSCALL, &IDTVEC(rsvd), SDT_SYSIGT, SEL_KPL, 0);
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}
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SYSINIT(ia32_syscall, SI_SUB_EXEC, SI_ORDER_ANY, ia32_syscall_enable, NULL);
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SYSUNINIT(ia32_syscall, SI_SUB_EXEC, SI_ORDER_ANY, ia32_syscall_disable, NULL);
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