2 * Copyright (C) 1994, David Greenman
3 * Copyright (c) 1990, 1993
4 * The Regents of the University of California. All rights reserved.
6 * This code is derived from software contributed to Berkeley by
7 * the University of Utah, and William Jolitz.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 * must display the following acknowledgement:
19 * This product includes software developed by the University of
20 * California, Berkeley and its contributors.
21 * 4. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 #include <sys/cdefs.h>
39 __FBSDID("$FreeBSD$");
42 * 386 Trap and System call handling
45 #include "opt_clock.h"
46 #include "opt_compat.h"
50 #include <sys/param.h>
52 #include <sys/systm.h>
54 #include <sys/pioctl.h>
55 #include <sys/kernel.h>
58 #include <sys/mutex.h>
60 #include <sys/ptrace.h>
61 #include <sys/resourcevar.h>
62 #include <sys/signalvar.h>
63 #include <sys/syscall.h>
64 #include <sys/sysctl.h>
65 #include <sys/sysent.h>
67 #include <sys/vmmeter.h>
68 #include <security/audit/audit.h>
71 #include <vm/vm_param.h>
73 #include <vm/vm_kern.h>
74 #include <vm/vm_map.h>
75 #include <vm/vm_page.h>
76 #include <vm/vm_extern.h>
78 #include <machine/cpu.h>
79 #include <machine/intr_machdep.h>
80 #include <machine/md_var.h>
82 #include <compat/freebsd32/freebsd32_signal.h>
83 #include <compat/freebsd32/freebsd32_util.h>
84 #include <compat/ia32/ia32_signal.h>
85 #include <machine/psl.h>
86 #include <machine/segments.h>
87 #include <machine/specialreg.h>
88 #include <machine/sysarch.h>
89 #include <machine/frame.h>
90 #include <machine/md_var.h>
91 #include <machine/pcb.h>
92 #include <machine/cpufunc.h>
94 #define IDTVEC(name) __CONCAT(X,name)
96 extern inthand_t IDTVEC(int0x80_syscall), IDTVEC(rsvd);
98 void ia32_syscall(struct trapframe *frame); /* Called from asm code */
101 ia32_set_syscall_retval(struct thread *td, int error)
104 cpu_set_syscall_retval(td, error);
108 ia32_fetch_syscall_args(struct thread *td, struct syscall_args *sa)
111 struct trapframe *frame;
113 u_int32_t args[8], tmp;
117 frame = td->td_frame;
119 params = (caddr_t)frame->tf_rsp + sizeof(u_int32_t);
120 sa->code = frame->tf_rax;
123 * Need to check if this is a 32 bit or 64 bit syscall.
125 if (sa->code == SYS_syscall) {
127 * Code is first argument, followed by actual args.
129 error = fueword32(params, &tmp);
133 params += sizeof(int);
134 } else if (sa->code == SYS___syscall) {
136 * Like syscall, but code is a quad, so as to maintain
137 * quad alignment for the rest of the arguments.
138 * We use a 32-bit fetch in case params is not
141 error = fueword32(params, &tmp);
145 params += sizeof(quad_t);
147 if (p->p_sysent->sv_mask)
148 sa->code &= p->p_sysent->sv_mask;
149 if (sa->code >= p->p_sysent->sv_size)
150 sa->callp = &p->p_sysent->sv_table[0];
152 sa->callp = &p->p_sysent->sv_table[sa->code];
153 sa->narg = sa->callp->sy_narg;
155 if (params != NULL && sa->narg != 0)
156 error = copyin(params, (caddr_t)args,
157 (u_int)(sa->narg * sizeof(int)));
161 for (i = 0; i < sa->narg; i++)
162 sa->args[i] = args[i];
165 td->td_retval[0] = 0;
166 td->td_retval[1] = frame->tf_rdx;
172 #include "../../kern/subr_syscall.c"
175 ia32_syscall(struct trapframe *frame)
178 struct syscall_args sa;
179 register_t orig_tf_rflags;
183 orig_tf_rflags = frame->tf_rflags;
185 td->td_frame = frame;
187 error = syscallenter(td, &sa);
192 if (orig_tf_rflags & PSL_T) {
193 frame->tf_rflags &= ~PSL_T;
194 ksiginfo_init_trap(&ksi);
195 ksi.ksi_signo = SIGTRAP;
196 ksi.ksi_code = TRAP_TRACE;
197 ksi.ksi_addr = (void *)frame->tf_rip;
198 trapsignal(td, &ksi);
201 syscallret(td, error, &sa);
205 ia32_syscall_enable(void *dummy)
208 setidt(IDT_SYSCALL, &IDTVEC(int0x80_syscall), SDT_SYSIGT, SEL_UPL, 0);
212 ia32_syscall_disable(void *dummy)
215 setidt(IDT_SYSCALL, &IDTVEC(rsvd), SDT_SYSIGT, SEL_KPL, 0);
218 SYSINIT(ia32_syscall, SI_SUB_EXEC, SI_ORDER_ANY, ia32_syscall_enable, NULL);
219 SYSUNINIT(ia32_syscall, SI_SUB_EXEC, SI_ORDER_ANY, ia32_syscall_disable, NULL);
223 setup_lcall_gate(void)
225 struct i386_ldt_args uap;
226 struct user_segment_descriptor descs[2];
227 struct gate_descriptor *ssd;
231 bzero(&uap, sizeof(uap));
236 * This is the easiest way to cut the space for system
237 * descriptor in ldt. Manually adjust the descriptor type to
238 * the call gate later.
240 bzero(&descs[0], sizeof(descs));
241 descs[0].sd_type = SDT_SYSNULL;
242 descs[1].sd_type = SDT_SYSNULL;
243 error = amd64_set_ldt(curthread, &uap, descs);
247 lcall_addr = curproc->p_sysent->sv_psstrings - sz_lcall_tramp;
249 ssd = (struct gate_descriptor *)(curproc->p_md.md_ldt->ldt_base);
250 bzero(ssd, sizeof(*ssd));
251 ssd->gd_looffset = lcall_addr;
252 ssd->gd_hioffset = lcall_addr >> 16;
253 ssd->gd_selector = _ucodesel;
254 ssd->gd_type = SDT_SYSCGT;
255 ssd->gd_dpl = SEL_UPL;
257 mtx_unlock(&dt_lock);