Annotation of sys/arch/m68k/m68k/sunos_machdep.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: sunos_machdep.c,v 1.18 2005/11/06 17:23:41 miod Exp $ */
! 2: /* $NetBSD: sunos_machdep.c,v 1.12 1996/10/13 03:19:22 christos Exp $ */
! 3:
! 4: /*
! 5: * Copyright (c) 1988 University of Utah.
! 6: * Copyright (c) 1982, 1986, 1990 The Regents of the University of California.
! 7: * All rights reserved.
! 8: *
! 9: * This code is derived from software contributed to Berkeley by
! 10: * the Systems Programming Group of the University of Utah Computer
! 11: * Science Department.
! 12: *
! 13: * Redistribution and use in source and binary forms, with or without
! 14: * modification, are permitted provided that the following conditions
! 15: * are met:
! 16: * 1. Redistributions of source code must retain the above copyright
! 17: * notice, this list of conditions and the following disclaimer.
! 18: * 2. Redistributions in binary form must reproduce the above copyright
! 19: * notice, this list of conditions and the following disclaimer in the
! 20: * documentation and/or other materials provided with the distribution.
! 21: * 3. 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.
! 24: *
! 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
! 35: * SUCH DAMAGE.
! 36: *
! 37: * from: Utah $Hdr: machdep.c 1.63 91/04/24$
! 38: *
! 39: * @(#)machdep.c 7.16 (Berkeley) 6/3/91
! 40: */
! 41:
! 42: #include <sys/param.h>
! 43: #include <sys/systm.h>
! 44: #include <sys/namei.h>
! 45: #include <sys/proc.h>
! 46: #include <sys/user.h>
! 47: #include <sys/filedesc.h>
! 48: #include <sys/ioctl.h>
! 49: #include <sys/mount.h>
! 50: #include <sys/kernel.h>
! 51: #include <sys/signal.h>
! 52: #include <sys/signalvar.h>
! 53: #include <sys/malloc.h>
! 54: #include <sys/buf.h>
! 55:
! 56: #include <sys/syscallargs.h>
! 57: #include <compat/sunos/sunos.h>
! 58: #include <compat/sunos/sunos_syscallargs.h>
! 59:
! 60: #include <machine/reg.h>
! 61:
! 62: #ifdef DEBUG
! 63: extern int sigdebug;
! 64: extern int sigpid;
! 65: #define SDB_FOLLOW 0x01
! 66: #define SDB_KSTACK 0x02
! 67: #define SDB_FPSTATE 0x04
! 68: #endif
! 69:
! 70: /* sigh.. I guess it's too late to change now, but "our" sigcontext
! 71: is plain vax, not very 68000 (ap, for example..) */
! 72: struct sunos_sigcontext {
! 73: int sc_onstack; /* sigstack state to restore */
! 74: int sc_mask; /* signal mask to restore */
! 75: int sc_sp; /* sp to restore */
! 76: int sc_pc; /* pc to restore */
! 77: int sc_ps; /* psl to restore */
! 78: };
! 79: struct sunos_sigframe {
! 80: int sf_signum; /* signo for handler */
! 81: int sf_code; /* additional info for handler */
! 82: struct sunos_sigcontext *sf_scp;/* context pointer for handler */
! 83: u_int sf_addr; /* even more info for handler */
! 84: struct sunos_sigcontext sf_sc; /* I don't know if that's what
! 85: comes here */
! 86: };
! 87: /*
! 88: * much simpler sendsig() for SunOS processes, as SunOS does the whole
! 89: * context-saving in usermode. For now, no hardware information (ie.
! 90: * frames for buserror etc) is saved. This could be fatal, so I take
! 91: * SIG_DFL for "dangerous" signals.
! 92: */
! 93: void
! 94: sunos_sendsig(catcher, sig, mask, code, type, val)
! 95: sig_t catcher;
! 96: int sig, mask;
! 97: u_long code;
! 98: int type;
! 99: union sigval val;
! 100: {
! 101: register struct proc *p = curproc;
! 102: register struct sunos_sigframe *fp;
! 103: struct sunos_sigframe kfp;
! 104: register struct frame *frame;
! 105: register struct sigacts *psp = p->p_sigacts;
! 106: register short ft;
! 107: int oonstack, fsize;
! 108:
! 109: frame = (struct frame *)p->p_md.md_regs;
! 110: ft = frame->f_format;
! 111: oonstack = psp->ps_sigstk.ss_flags & SS_ONSTACK;
! 112:
! 113: /*
! 114: * if this is a hardware fault (ft >= FMT9), sunos_sendsig
! 115: * can't currently handle it. Reset signal actions and
! 116: * have the process die unconditionally.
! 117: */
! 118: if (ft >= FMT9) {
! 119: sigexit(p, sig);
! 120: /* NOTREACHED */
! 121: }
! 122:
! 123: /*
! 124: * Allocate and validate space for the signal handler
! 125: * context. Note that if the stack is in P0 space, the
! 126: * call to grow() is a nop, and the useracc() check
! 127: * will fail if the process has not already allocated
! 128: * the space with a `brk'.
! 129: */
! 130: fsize = sizeof(struct sunos_sigframe);
! 131: if ((psp->ps_flags & SAS_ALTSTACK) && oonstack == 0 &&
! 132: (psp->ps_sigonstack & sigmask(sig))) {
! 133: fp = (struct sunos_sigframe *)(psp->ps_sigstk.ss_sp +
! 134: psp->ps_sigstk.ss_size - sizeof(struct sunos_sigframe));
! 135: psp->ps_sigstk.ss_flags |= SS_ONSTACK;
! 136: } else
! 137: fp = (struct sunos_sigframe *)frame->f_regs[SP] - 1;
! 138: if ((vaddr_t)fp <= USRSTACK - ctob(p->p_vmspace->vm_ssize))
! 139: (void)uvm_grow(p, (unsigned)fp);
! 140: #ifdef DEBUG
! 141: if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid)
! 142: printf("sunos_sendsig(%d): sig %d ssp %p usp %p scp %p ft %d\n",
! 143: p->p_pid, sig, &oonstack, fp, &fp->sf_sc, ft);
! 144: #endif
! 145: /*
! 146: * Build the argument list for the signal handler.
! 147: */
! 148: kfp.sf_signum = sig;
! 149: kfp.sf_code = code;
! 150: kfp.sf_scp = &fp->sf_sc;
! 151: kfp.sf_addr = (u_int)val.sival_ptr;
! 152:
! 153: /*
! 154: * Build the signal context to be used by sigreturn.
! 155: */
! 156: kfp.sf_sc.sc_onstack = oonstack;
! 157: kfp.sf_sc.sc_mask = mask;
! 158: kfp.sf_sc.sc_sp = frame->f_regs[SP];
! 159: kfp.sf_sc.sc_pc = frame->f_pc;
! 160: kfp.sf_sc.sc_ps = frame->f_sr;
! 161:
! 162: if (copyout(&kfp, fp, fsize) != 0) {
! 163: #ifdef DEBUG
! 164: if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid)
! 165: printf("sunos_sendsig(%d): copyout failed on sig %d\n",
! 166: p->p_pid, sig);
! 167: #endif
! 168: /*
! 169: * Process has trashed its stack; give it an illegal
! 170: * instruction to halt it in its tracks.
! 171: */
! 172: sigexit(p, SIGILL);
! 173: /* NOTREACHED */
! 174: }
! 175:
! 176: frame->f_regs[SP] = (int)fp;
! 177: #ifdef DEBUG
! 178: if (sigdebug & SDB_FOLLOW)
! 179: printf("sunos_sendsig(%d): sig %d scp %p sc_sp %x\n",
! 180: p->p_pid, sig, &fp->sf_sc,kfp.sf_sc.sc_sp);
! 181: #endif
! 182:
! 183: /* have the user-level trampoline code sort out what registers it
! 184: has to preserve. */
! 185: frame->f_pc = (u_int) catcher;
! 186: #ifdef DEBUG
! 187: if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid)
! 188: printf("sunos_sendsig(%d): sig %d returns\n",
! 189: p->p_pid, sig);
! 190: #endif
! 191: }
! 192:
! 193:
! 194: /*
! 195: * System call to cleanup state after a signal
! 196: * has been taken. Reset signal mask and
! 197: * stack state from context left by sendsig (above).
! 198: * Return to previous pc and psl as specified by
! 199: * context left by sendsig. Check carefully to
! 200: * make sure that the user has not modified the
! 201: * psl to gain improper privileges or to cause
! 202: * a machine fault.
! 203: */
! 204: int
! 205: sunos_sys_sigreturn(p, v, retval)
! 206: struct proc *p;
! 207: void *v;
! 208: register_t *retval;
! 209: {
! 210: struct sunos_sys_sigreturn_args *uap = v;
! 211: register struct sunos_sigcontext *scp;
! 212: register struct frame *frame;
! 213: struct sunos_sigcontext tsigc;
! 214:
! 215: scp = (struct sunos_sigcontext *) SCARG(uap, sigcntxp);
! 216: #ifdef DEBUG
! 217: if (sigdebug & SDB_FOLLOW)
! 218: printf("sunos_sigreturn: pid %d, scp %p\n", p->p_pid, scp);
! 219: #endif
! 220: if ((int)scp & 1)
! 221: return (EINVAL);
! 222: /*
! 223: * Test and fetch the context structure.
! 224: * We grab it all at once for speed.
! 225: */
! 226: if (copyin((caddr_t)scp, (caddr_t)&tsigc, sizeof(tsigc)))
! 227: return (EINVAL);
! 228: scp = &tsigc;
! 229: if ((scp->sc_ps & PSL_USERCLR) != 0 ||
! 230: (scp->sc_ps & PSL_USERSET) != PSL_USERSET)
! 231: return (EINVAL);
! 232: /*
! 233: * Restore the user supplied information
! 234: */
! 235: if (scp->sc_onstack & 1)
! 236: p->p_sigacts->ps_sigstk.ss_flags |= SS_ONSTACK;
! 237: else
! 238: p->p_sigacts->ps_sigstk.ss_flags &= ~SS_ONSTACK;
! 239: p->p_sigmask = scp->sc_mask &~ sigcantmask;
! 240: frame = (struct frame *) p->p_md.md_regs;
! 241: frame->f_regs[SP] = scp->sc_sp;
! 242: frame->f_pc = scp->sc_pc;
! 243: frame->f_sr = scp->sc_ps;
! 244:
! 245: return EJUSTRETURN;
! 246: }
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