freebsd_syscall.c revision 1.2.2.2
1 1.2.2.2 skrll /* $NetBSD: freebsd_syscall.c,v 1.2.2.2 2017/08/28 17:51:58 skrll Exp $ */ 2 1.2.2.2 skrll 3 1.2.2.2 skrll /*- 4 1.2.2.2 skrll * Copyright (c) 1998, 2000 The NetBSD Foundation, Inc. 5 1.2.2.2 skrll * All rights reserved. 6 1.2.2.2 skrll * 7 1.2.2.2 skrll * This code is derived from software contributed to The NetBSD Foundation 8 1.2.2.2 skrll * by Charles M. Hannum. 9 1.2.2.2 skrll * 10 1.2.2.2 skrll * Redistribution and use in source and binary forms, with or without 11 1.2.2.2 skrll * modification, are permitted provided that the following conditions 12 1.2.2.2 skrll * are met: 13 1.2.2.2 skrll * 1. Redistributions of source code must retain the above copyright 14 1.2.2.2 skrll * notice, this list of conditions and the following disclaimer. 15 1.2.2.2 skrll * 2. Redistributions in binary form must reproduce the above copyright 16 1.2.2.2 skrll * notice, this list of conditions and the following disclaimer in the 17 1.2.2.2 skrll * documentation and/or other materials provided with the distribution. 18 1.2.2.2 skrll * 19 1.2.2.2 skrll * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 1.2.2.2 skrll * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 1.2.2.2 skrll * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 1.2.2.2 skrll * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 1.2.2.2 skrll * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 1.2.2.2 skrll * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 1.2.2.2 skrll * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 1.2.2.2 skrll * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 1.2.2.2 skrll * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 1.2.2.2 skrll * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 1.2.2.2 skrll * POSSIBILITY OF SUCH DAMAGE. 30 1.2.2.2 skrll */ 31 1.2.2.2 skrll 32 1.2.2.2 skrll #include <sys/cdefs.h> 33 1.2.2.2 skrll __KERNEL_RCSID(0, "$NetBSD: freebsd_syscall.c,v 1.2.2.2 2017/08/28 17:51:58 skrll Exp $"); 34 1.2.2.2 skrll 35 1.2.2.2 skrll #include <sys/param.h> 36 1.2.2.2 skrll #include <sys/systm.h> 37 1.2.2.2 skrll #include <sys/proc.h> 38 1.2.2.2 skrll #include <sys/signal.h> 39 1.2.2.2 skrll #include <sys/syscall.h> 40 1.2.2.2 skrll #include <sys/syscallvar.h> 41 1.2.2.2 skrll 42 1.2.2.2 skrll #include <uvm/uvm_extern.h> 43 1.2.2.2 skrll 44 1.2.2.2 skrll #include <machine/cpu.h> 45 1.2.2.2 skrll #include <machine/psl.h> 46 1.2.2.2 skrll #include <machine/userret.h> 47 1.2.2.2 skrll 48 1.2.2.2 skrll #include <compat/sys/signal.h> 49 1.2.2.2 skrll 50 1.2.2.2 skrll #include <compat/freebsd/freebsd_machdep.h> 51 1.2.2.2 skrll #include <compat/freebsd/freebsd_syscall.h> 52 1.2.2.2 skrll 53 1.2.2.2 skrll void freebsd_syscall(struct trapframe *); 54 1.2.2.2 skrll 55 1.2.2.2 skrll void 56 1.2.2.2 skrll freebsd_syscall_intern(struct proc *p) 57 1.2.2.2 skrll { 58 1.2.2.2 skrll 59 1.2.2.2 skrll p->p_md.md_syscall = freebsd_syscall; 60 1.2.2.2 skrll } 61 1.2.2.2 skrll 62 1.2.2.2 skrll /* 63 1.2.2.2 skrll * syscall(frame): 64 1.2.2.2 skrll * System call request from POSIX system call gate interface to kernel. 65 1.2.2.2 skrll * Like trap(), argument is call by reference. 66 1.2.2.2 skrll */ 67 1.2.2.2 skrll void 68 1.2.2.2 skrll freebsd_syscall(struct trapframe *frame) 69 1.2.2.2 skrll { 70 1.2.2.2 skrll char *params; 71 1.2.2.2 skrll const struct sysent *callp; 72 1.2.2.2 skrll struct lwp *l; 73 1.2.2.2 skrll struct proc *p; 74 1.2.2.2 skrll int error; 75 1.2.2.2 skrll size_t argsize; 76 1.2.2.2 skrll register_t code, args[8], rval[2]; 77 1.2.2.2 skrll 78 1.2.2.2 skrll l = curlwp; 79 1.2.2.2 skrll p = l->l_proc; 80 1.2.2.2 skrll LWP_CACHE_CREDS(l, p); 81 1.2.2.2 skrll 82 1.2.2.2 skrll code = frame->tf_eax; 83 1.2.2.2 skrll callp = p->p_emul->e_sysent; 84 1.2.2.2 skrll params = (char *)frame->tf_esp + sizeof(int); 85 1.2.2.2 skrll 86 1.2.2.2 skrll switch (code) { 87 1.2.2.2 skrll case SYS_syscall: 88 1.2.2.2 skrll /* 89 1.2.2.2 skrll * Code is first argument, followed by actual args. 90 1.2.2.2 skrll */ 91 1.2.2.2 skrll code = fuword(params); 92 1.2.2.2 skrll params += sizeof(int); 93 1.2.2.2 skrll break; 94 1.2.2.2 skrll case SYS___syscall: 95 1.2.2.2 skrll /* 96 1.2.2.2 skrll * Like syscall, but code is a quad, so as to maintain 97 1.2.2.2 skrll * quad alignment for the rest of the arguments. 98 1.2.2.2 skrll */ 99 1.2.2.2 skrll code = fuword(params + _QUAD_LOWWORD * sizeof(int)); 100 1.2.2.2 skrll params += sizeof(quad_t); 101 1.2.2.2 skrll break; 102 1.2.2.2 skrll default: 103 1.2.2.2 skrll break; 104 1.2.2.2 skrll } 105 1.2.2.2 skrll 106 1.2.2.2 skrll code &= (SYS_NSYSENT - 1); 107 1.2.2.2 skrll callp += code; 108 1.2.2.2 skrll argsize = callp->sy_argsize; 109 1.2.2.2 skrll if (argsize) { 110 1.2.2.2 skrll error = copyin(params, (void *)args, argsize); 111 1.2.2.2 skrll if (error) 112 1.2.2.2 skrll goto bad; 113 1.2.2.2 skrll } 114 1.2.2.2 skrll 115 1.2.2.2 skrll if (!__predict_false(p->p_trace_enabled || KDTRACE_ENTRY(callp->sy_entry)) 116 1.2.2.2 skrll || (error = trace_enter(code, callp, args)) == 0) { 117 1.2.2.2 skrll rval[0] = 0; 118 1.2.2.2 skrll rval[1] = frame->tf_edx; /* need to keep edx for shared FreeBSD bins */ 119 1.2.2.2 skrll error = sy_call(callp, l, args, rval); 120 1.2.2.2 skrll } 121 1.2.2.2 skrll 122 1.2.2.2 skrll switch (error) { 123 1.2.2.2 skrll case 0: 124 1.2.2.2 skrll frame->tf_eax = rval[0]; 125 1.2.2.2 skrll frame->tf_edx = rval[1]; 126 1.2.2.2 skrll frame->tf_eflags &= ~PSL_C; /* carry bit */ 127 1.2.2.2 skrll break; 128 1.2.2.2 skrll case ERESTART: 129 1.2.2.2 skrll /* 130 1.2.2.2 skrll * The offset to adjust the PC by depends on whether we entered 131 1.2.2.2 skrll * the kernel through the trap or call gate. We pushed the 132 1.2.2.2 skrll * size of the instruction into tf_err on entry. 133 1.2.2.2 skrll */ 134 1.2.2.2 skrll frame->tf_eip -= frame->tf_err; 135 1.2.2.2 skrll break; 136 1.2.2.2 skrll case EJUSTRETURN: 137 1.2.2.2 skrll /* nothing to do */ 138 1.2.2.2 skrll break; 139 1.2.2.2 skrll default: 140 1.2.2.2 skrll bad: 141 1.2.2.2 skrll frame->tf_eax = error; 142 1.2.2.2 skrll frame->tf_eflags |= PSL_C; /* carry bit */ 143 1.2.2.2 skrll break; 144 1.2.2.2 skrll } 145 1.2.2.2 skrll 146 1.2.2.2 skrll if (__predict_false(p->p_trace_enabled || KDTRACE_ENTRY(callp->sy_return))) 147 1.2.2.2 skrll trace_exit(code, callp, args, rval, error); 148 1.2.2.2 skrll 149 1.2.2.2 skrll userret(l); 150 1.2.2.2 skrll } 151
Indexes created Thu Oct 23 22:10:10 GMT 2025