Annotation of sys/arch/m68k/m68k/sunos_machdep.c, Revision 1.1.1.1
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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