1 | /* $NetBSD: linux_syscall.c,v 1.32 2015/03/07 18:41:40 christos Exp $ */ |
2 | |
3 | /*- |
4 | * Copyright (c) 1998, 2000 The NetBSD Foundation, Inc. |
5 | * All rights reserved. |
6 | * |
7 | * This code is derived from software contributed to The NetBSD Foundation |
8 | * by Charles M. Hannum. |
9 | * |
10 | * Redistribution and use in source and binary forms, with or without |
11 | * modification, are permitted provided that the following conditions |
12 | * are met: |
13 | * 1. Redistributions of source code must retain the above copyright |
14 | * notice, this list of conditions and the following disclaimer. |
15 | * 2. Redistributions in binary form must reproduce the above copyright |
16 | * notice, this list of conditions and the following disclaimer in the |
17 | * documentation and/or other materials provided with the distribution. |
18 | * |
19 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
20 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
21 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
22 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
23 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
24 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
25 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
26 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
27 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
28 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
29 | * POSSIBILITY OF SUCH DAMAGE. |
30 | */ |
31 | |
32 | #include <sys/cdefs.h> |
33 | __KERNEL_RCSID(0, "$NetBSD: linux_syscall.c,v 1.32 2015/03/07 18:41:40 christos Exp $" ); |
34 | |
35 | #if defined(_KERNEL_OPT) |
36 | #include "opt_compat_linux.h" |
37 | #endif |
38 | |
39 | #include <sys/param.h> |
40 | #include <sys/systm.h> |
41 | #include <sys/proc.h> |
42 | #include <sys/signal.h> |
43 | #include <sys/syscall.h> |
44 | #include <sys/syscallvar.h> |
45 | |
46 | #include <machine/cpu.h> |
47 | #include <machine/psl.h> |
48 | #include <machine/userret.h> |
49 | |
50 | #include <compat/linux/linux_syscall.h> |
51 | #include <compat/linux/common/linux_types.h> |
52 | #include <compat/linux/common/linux_errno.h> |
53 | #include <compat/linux/common/linux_signal.h> |
54 | #include <compat/linux/common/linux_siginfo.h> |
55 | #include <compat/linux/arch/amd64/linux_siginfo.h> |
56 | #include <compat/linux/arch/amd64/linux_machdep.h> |
57 | |
58 | void linux_syscall_intern(struct proc *); |
59 | static void linux_syscall(struct trapframe *); |
60 | |
61 | void |
62 | linux_syscall_intern(struct proc *p) |
63 | { |
64 | |
65 | p->p_md.md_syscall = linux_syscall; |
66 | } |
67 | |
68 | /* |
69 | * syscall(frame): |
70 | * System call request from POSIX system call gate interface to kernel. |
71 | * Like trap(), argument is call by reference. |
72 | */ |
73 | static void |
74 | linux_syscall(struct trapframe *frame) |
75 | { |
76 | const struct sysent *callp; |
77 | struct proc *p; |
78 | struct lwp *l; |
79 | int error; |
80 | register_t code, rval[2]; |
81 | #define args (&frame->tf_rdi) |
82 | |
83 | l = curlwp; |
84 | p = l->l_proc; |
85 | |
86 | code = frame->tf_rax; |
87 | |
88 | LWP_CACHE_CREDS(l, p); |
89 | |
90 | callp = p->p_emul->e_sysent; |
91 | |
92 | code &= (LINUX_SYS_NSYSENT - 1); |
93 | callp += code; |
94 | |
95 | /* |
96 | * Linux system calls have a maximum of 6 arguments, they are |
97 | * already adjacent in the syscall trapframe. |
98 | */ |
99 | |
100 | if (__predict_false(p->p_trace_enabled || KDTRACE_ENTRY(callp->sy_entry)) |
101 | && (error = trace_enter(code, callp, args)) != 0) |
102 | goto out; |
103 | |
104 | rval[0] = 0; |
105 | rval[1] = 0; |
106 | error = sy_call(callp, l, args, rval); |
107 | out: |
108 | switch (error) { |
109 | case 0: |
110 | frame->tf_rax = rval[0]; |
111 | break; |
112 | case ERESTART: |
113 | /* |
114 | * The offset to adjust the PC by depends on whether we entered |
115 | * the kernel through the trap or call gate. We pushed the |
116 | * size of the instruction into tf_err on entry. |
117 | */ |
118 | frame->tf_rip -= frame->tf_err; |
119 | break; |
120 | case EJUSTRETURN: |
121 | /* nothing to do */ |
122 | break; |
123 | default: |
124 | error = native_to_linux_errno[error]; |
125 | frame->tf_rax = error; |
126 | break; |
127 | } |
128 | |
129 | if (__predict_false(p->p_trace_enabled || KDTRACE_ENTRY(callp->sy_return))) |
130 | trace_exit(code, callp, args, rval, error); |
131 | |
132 | userret(l); |
133 | } |
134 | |