Annotation of sys/arch/arm/arm/syscall.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: syscall.c,v 1.9 2007/04/27 18:45:00 drahn Exp $ */
! 2: /* $NetBSD: syscall.c,v 1.24 2003/11/14 19:03:17 scw Exp $ */
! 3:
! 4: /*-
! 5: * Copyright (c) 2000, 2003 The NetBSD Foundation, Inc.
! 6: * All rights reserved.
! 7: *
! 8: * This code is derived from software contributed to The NetBSD Foundation
! 9: * by Charles M. Hannum.
! 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 NetBSD
! 22: * Foundation, Inc. and its contributors.
! 23: * 4. Neither the name of The NetBSD Foundation nor the names of its
! 24: * contributors may be used to endorse or promote products derived
! 25: * from this software without specific prior written permission.
! 26: *
! 27: * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
! 28: * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
! 29: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
! 30: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
! 31: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
! 32: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
! 33: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
! 34: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
! 35: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
! 36: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
! 37: * POSSIBILITY OF SUCH DAMAGE.
! 38: */
! 39:
! 40: /*
! 41: * Copyright (c) 1994-1998 Mark Brinicombe.
! 42: * Copyright (c) 1994 Brini.
! 43: * All rights reserved.
! 44: *
! 45: * This code is derived from software written for Brini by Mark Brinicombe
! 46: *
! 47: * Redistribution and use in source and binary forms, with or without
! 48: * modification, are permitted provided that the following conditions
! 49: * are met:
! 50: * 1. Redistributions of source code must retain the above copyright
! 51: * notice, this list of conditions and the following disclaimer.
! 52: * 2. Redistributions in binary form must reproduce the above copyright
! 53: * notice, this list of conditions and the following disclaimer in the
! 54: * documentation and/or other materials provided with the distribution.
! 55: * 3. All advertising materials mentioning features or use of this software
! 56: * must display the following acknowledgement:
! 57: * This product includes software developed by Mark Brinicombe
! 58: * for the NetBSD Project.
! 59: * 4. The name of the company nor the name of the author may be used to
! 60: * endorse or promote products derived from this software without specific
! 61: * prior written permission.
! 62: *
! 63: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
! 64: * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
! 65: * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
! 66: * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
! 67: * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
! 68: * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
! 69: * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 70: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 71: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 72: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 73: * SUCH DAMAGE.
! 74: *
! 75: * syscall entry handling
! 76: *
! 77: * Created : 09/11/94
! 78: */
! 79:
! 80: #include <sys/param.h>
! 81:
! 82: #include <sys/device.h>
! 83: #include <sys/errno.h>
! 84: #include <sys/kernel.h>
! 85: #include <sys/reboot.h>
! 86: #include <sys/signalvar.h>
! 87: #include <sys/syscall.h>
! 88: #include <sys/systm.h>
! 89: #include <sys/user.h>
! 90: #ifdef KTRACE
! 91: #include <sys/ktrace.h>
! 92: #endif
! 93:
! 94: #include "systrace.h"
! 95: #include <dev/systrace.h>
! 96:
! 97: #include <uvm/uvm_extern.h>
! 98:
! 99: #include <machine/cpu.h>
! 100: #include <machine/frame.h>
! 101: #include <machine/pcb.h>
! 102: #include <arm/swi.h>
! 103:
! 104: #ifdef acorn26
! 105: #include <machine/machdep.h>
! 106: #endif
! 107:
! 108: #define MAXARGS 8
! 109:
! 110: void
! 111: swi_handler(trapframe_t *frame)
! 112: {
! 113: struct proc *p = curproc;
! 114: const struct sysent *callp;
! 115: int code, error, orig_error;
! 116: u_int nap = 4, nargs;
! 117: register_t *ap, *args, copyargs[MAXARGS], rval[2];
! 118:
! 119: uvmexp.syscalls++;
! 120:
! 121: /* Re-enable interrupts if they were enabled previously */
! 122: if (__predict_true((frame->tf_spsr & I32_bit) == 0))
! 123: enable_interrupts(I32_bit);
! 124:
! 125: p->p_addr->u_pcb.pcb_tf = frame;
! 126:
! 127: code = frame->tf_r12;
! 128:
! 129: ap = &frame->tf_r0;
! 130: callp = p->p_emul->e_sysent;
! 131:
! 132: switch (code) {
! 133: case SYS_syscall:
! 134: code = *ap++;
! 135: nap--;
! 136: break;
! 137: case SYS___syscall:
! 138: code = ap[_QUAD_LOWWORD];
! 139: ap += 2;
! 140: nap -= 2;
! 141: break;
! 142: }
! 143:
! 144: if (code < 0 || code >= p->p_emul->e_nsysent) {
! 145: callp += p->p_emul->e_nosys;
! 146: } else {
! 147: callp += code;
! 148: }
! 149: nargs = callp->sy_argsize / sizeof(register_t);
! 150: if (nargs <= nap) {
! 151: args = ap;
! 152: error = 0;
! 153: } else {
! 154: KASSERT(nargs <= MAXARGS);
! 155: memcpy(copyargs, ap, nap * sizeof(register_t));
! 156: error = copyin((void *)frame->tf_usr_sp, copyargs + nap,
! 157: (nargs - nap) * sizeof(register_t));
! 158: args = copyargs;
! 159: }
! 160: orig_error = error;
! 161: #ifdef SYSCALL_DEBUG
! 162: scdebug_call(p, code, args);
! 163: #endif
! 164: #ifdef KTRACE
! 165: if (KTRPOINT(p, KTR_SYSCALL))
! 166: ktrsyscall(p, code, callp->sy_argsize, args);
! 167: #endif
! 168: if (error)
! 169: goto bad;
! 170:
! 171: rval[0] = 0;
! 172: rval[1] = frame->tf_r1;
! 173: #if NSYSTRACE > 0
! 174: if (ISSET(p->p_flag, P_SYSTRACE))
! 175: orig_error = error = systrace_redirect(code, p, args, rval);
! 176: else
! 177: #endif
! 178: orig_error = error = (*callp->sy_call)(p, args, rval);
! 179:
! 180: switch (error) {
! 181: case 0:
! 182: frame->tf_r0 = rval[0];
! 183: frame->tf_r1 = rval[1];
! 184:
! 185: frame->tf_spsr &= ~PSR_C_bit; /* carry bit */
! 186: break;
! 187:
! 188: case ERESTART:
! 189: /*
! 190: * Reconstruct the pc to point at the swi.
! 191: */
! 192: frame->tf_pc -= INSN_SIZE;
! 193: break;
! 194:
! 195: case EJUSTRETURN:
! 196: /* nothing to do */
! 197: break;
! 198:
! 199: default:
! 200: bad:
! 201: frame->tf_r0 = error;
! 202: frame->tf_spsr |= PSR_C_bit; /* carry bit */
! 203: break;
! 204: }
! 205: #ifdef SYSCALL_DEBUG
! 206: scdebug_ret(p, code, orig_error, rval);
! 207: #endif
! 208: userret(p);
! 209: #ifdef KTRACE
! 210: if (KTRPOINT(p, KTR_SYSRET))
! 211: ktrsysret(p, code, orig_error, rval[0]);
! 212: #endif
! 213: }
! 214:
! 215: void
! 216: child_return(arg)
! 217: void *arg;
! 218: {
! 219: struct proc *p = arg;
! 220: struct trapframe *frame = p->p_addr->u_pcb.pcb_tf;
! 221:
! 222: frame->tf_r0 = 0;
! 223: frame->tf_spsr &= ~PSR_C_bit; /* carry bit */
! 224:
! 225: userret(p);
! 226:
! 227: #ifdef KTRACE
! 228: if (KTRPOINT(p, KTR_SYSRET)) {
! 229: ktrsysret(p,
! 230: (p->p_flag & P_PPWAIT) ? SYS_vfork : SYS_fork, 0, 0);
! 231: }
! 232: #endif
! 233: }
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