1 /* $NetBSD: sunos_machdep.c,v 1.35 2023/12/20 05:33:59 thorpej Exp $ */
2
3 /*
4 * Copyright (c) 1995 Matthew R. Green
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30 __KERNEL_RCSID(0, "$NetBSD: sunos_machdep.c,v 1.35 2023/12/20 05:33:59 thorpej Exp $");
31
32 #ifdef _KERNEL_OPT
33 #include "opt_ddb.h"
34 #endif
35
36 #include <sys/param.h>
37 #include <sys/systm.h>
38 #include <sys/proc.h>
39 #include <sys/namei.h>
40 #include <sys/filedesc.h>
41 #include <sys/ioctl.h>
42 #include <sys/mount.h>
43 #include <sys/kernel.h>
44 #include <sys/signal.h>
45 #include <sys/signalvar.h>
46
47 #include <compat/sys/signal.h>
48 #include <compat/sys/signalvar.h>
49
50 #include <sys/syscallargs.h>
51 #include <compat/sunos/sunos.h>
52 #include <compat/sunos/sunos_syscallargs.h>
53
54 #include <machine/frame.h>
55 #include <machine/cpu.h>
56
57 #ifdef DEBUG
58 #include <sparc64/sparc64/sigdebug.h>
59 #endif
60
61 struct sunos_sigcontext {
62 int sc_onstack; /* sigstack state to restore */
63 int sc_mask; /* signal mask to restore (old style) */
64 /* begin machine dependent portion */
65 int sc_sp; /* %sp to restore */
66 int sc_pc; /* pc to restore */
67 int sc_npc; /* npc to restore */
68 int sc_psr; /* pstate to restore */
69 int sc_g1; /* %g1 to restore */
70 int sc_o0; /* %o0 to restore */
71 };
72
73 struct sunos_sigframe {
74 int sf_signo; /* signal number */
75 int sf_code; /* code */
76 uint32_t sf_scp; /* SunOS user addr of sigcontext */
77 int sf_addr; /* SunOS compat, always 0 for now */
78 struct sunos_sigcontext sf_sc; /* actual sigcontext */
79 };
80
81 void
sunos_sendsig(const ksiginfo_t * ksi,const sigset_t * mask)82 sunos_sendsig(const ksiginfo_t *ksi, const sigset_t *mask)
83 {
84 register struct lwp *l = curlwp;
85 struct proc *p = l->l_proc;
86 register struct sunos_sigframe *fp;
87 register struct trapframe64 *tf;
88 register int addr, onstack;
89 struct rwindow32 *oldsp, *newsp;
90 register32_t sp;
91 int sig = ksi->ksi_signo, error;
92 sig_t catcher = SIGACTION(p, sig).sa_handler;
93 struct sunos_sigframe sf;
94
95 tf = (struct trapframe64 *)l->l_md.md_tf;
96 /* Need to attempt to zero extend this 32-bit pointer */
97 oldsp = (struct rwindow32 *)(u_long)(u_int)tf->tf_out[6];
98 /*
99 * Compute new user stack addresses, subtract off
100 * one signal frame, and align.
101 */
102 onstack =
103 (l->l_sigstk.ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 &&
104 (SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0;
105
106 if (onstack)
107 fp = (struct sunos_sigframe *)((char *)l->l_sigstk.ss_sp +
108 l->l_sigstk.ss_size);
109 else
110 fp = (struct sunos_sigframe *)oldsp;
111 fp = (struct sunos_sigframe *)((long)(fp - 1) & ~7);
112
113 #ifdef DEBUG
114 sigpid = p->p_pid;
115 if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) {
116 printf("sunos_sendsig: %s[%d] sig %d newusp %p scp %p oldsp %p\n",
117 p->p_comm, p->p_pid, sig, fp, &fp->sf_sc, oldsp);
118 #ifdef DDB
119 if (sigdebug & SDB_DDB) Debugger();
120 #endif
121 }
122 #endif
123 /*
124 * Now set up the signal frame. We build it in kernel space
125 * and then copy it out. We probably ought to just build it
126 * directly in user space....
127 */
128 sf.sf_signo = sig;
129 sf.sf_code = ksi->ksi_trap;
130 sf.sf_scp = (u_long)&fp->sf_sc;
131 sf.sf_addr = 0; /* XXX */
132
133 /*
134 * Build the signal context to be used by sigreturn.
135 */
136 sf.sf_sc.sc_onstack = l->l_sigstk.ss_flags & SS_ONSTACK;
137 native_sigset_to_sigset13(mask, &sf.sf_sc.sc_mask);
138 sf.sf_sc.sc_sp = (long)oldsp;
139 sf.sf_sc.sc_pc = tf->tf_pc;
140 sf.sf_sc.sc_npc = tf->tf_npc;
141 sf.sf_sc.sc_psr = TSTATECCR_TO_PSR(tf->tf_tstate); /* XXX */
142 sf.sf_sc.sc_g1 = tf->tf_global[1];
143 sf.sf_sc.sc_o0 = tf->tf_out[0];
144
145 /*
146 * Put the stack in a consistent state before we whack away
147 * at it. Note that write_user_windows may just dump the
148 * registers into the pcb; we need them in the process's memory.
149 * We also need to make sure that when we start the signal handler,
150 * its %i6 (%fp), which is loaded from the newly allocated stack area,
151 * joins seamlessly with the frame it was in when the signal occurred,
152 * so that the debugger and _longjmp code can back up through it.
153 */
154 sendsig_reset(l, sig);
155 mutex_exit(p->p_lock);
156 newsp = (struct rwindow32 *)((long)fp - sizeof(struct rwindow32));
157 write_user_windows();
158 #ifdef DEBUG
159 if ((sigdebug & SDB_KSTACK))
160 printf("sunos_sendsig: saving sf to %p, setting stack pointer %p to %p\n",
161 fp, &(((struct rwindow32 *)newsp)->rw_in[6]), oldsp);
162 #endif
163 sp = (register32_t)(uintptr_t)oldsp;
164 error = (rwindow_save(l) ||
165 copyout((void *)&sf, (void *)fp, sizeof sf) ||
166 copyout(&sp, &(((struct rwindow32 *)newsp)->rw_in[6]),
167 sizeof(sp)));
168 mutex_enter(p->p_lock);
169
170 if (error) {
171 /*
172 * Process has trashed its stack; give it an illegal
173 * instruction to halt it in its tracks.
174 */
175 #ifdef DEBUG
176 if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid)
177 printf("sunos_sendsig: window save or copyout error\n");
178 printf("sunos_sendsig: stack was trashed trying to send sig %d, sending SIGILL\n", sig);
179 #ifdef DDB
180 if (sigdebug & SDB_DDB) Debugger();
181 #endif
182 #endif
183 sigexit(l, SIGILL);
184 /* NOTREACHED */
185 }
186
187 #ifdef DEBUG
188 if (sigdebug & SDB_FOLLOW) {
189 printf("sunos_sendsig: %s[%d] sig %d scp %p\n",
190 p->p_comm, p->p_pid, sig, &fp->sf_sc);
191 }
192 #endif
193 /*
194 * Arrange to continue execution at the code copied out in exec().
195 * It needs the function to call in %g1, and a new stack pointer.
196 */
197 addr = (long)catcher; /* user does his own trampolining */
198 tf->tf_pc = addr;
199 tf->tf_npc = addr + 4;
200 tf->tf_out[6] = (uint64_t)(u_int)(u_long)newsp;
201 #ifdef DEBUG
202 if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) {
203 printf("sunos_sendsig: about to return to catcher %p thru %p\n",
204 catcher, (void *)(u_long)addr);
205 #ifdef DDB
206 if (sigdebug & SDB_DDB) Debugger();
207 #endif
208 }
209 #endif
210 }
211
212 int
sunos_sys_sigreturn(register struct lwp * l,const struct sunos_sys_sigreturn_args * uap,register_t * retval)213 sunos_sys_sigreturn(register struct lwp *l, const struct sunos_sys_sigreturn_args *uap, register_t *retval)
214 {
215 struct proc *p = l->l_proc;
216 struct sunos_sigcontext sc, *scp;
217 sigset_t mask;
218 struct trapframe64 *tf;
219
220 /* First ensure consistent stack state (see sendsig). */
221 write_user_windows();
222 if (rwindow_save(l)) {
223 mutex_enter(p->p_lock);
224 sigexit(l, SIGILL);
225 }
226 #ifdef DEBUG
227 if (sigdebug & SDB_FOLLOW) {
228 printf("sunos_sigreturn: %s[%d], sigcntxp %p\n",
229 p->p_comm, p->p_pid, SCARG(uap, sigcntxp));
230 #ifdef DDB
231 if (sigdebug & SDB_DDB) Debugger();
232 #endif
233 }
234 #endif
235
236 scp = (struct sunos_sigcontext *)SCARG(uap, sigcntxp);
237 if ((vaddr_t)scp & 3 || (copyin((void *)scp, &sc, sizeof sc) != 0))
238 return (EFAULT);
239 scp = ≻
240
241 tf = (struct trapframe64 *)l->l_md.md_tf;
242 /*
243 * Only the icc bits in the psr are used, so it need not be
244 * verified. pc and npc must be multiples of 4. This is all
245 * that is required; if it holds, just do it.
246 */
247 if (((scp->sc_pc | scp->sc_npc) & 3) != 0 || scp->sc_pc == 0 || scp->sc_npc == 0)
248 #ifdef DEBUG
249 {
250 printf("sunos_sigreturn: pc %p or npc %p invalid\n", (void *)(u_long)scp->sc_pc, (void *)(u_long)scp->sc_npc);
251 #ifdef DDB
252 Debugger();
253 #endif
254 return (EINVAL);
255 }
256 #endif
257 return (EINVAL);
258 /* take only psr ICC field */
259 tf->tf_tstate = (int64_t)(tf->tf_tstate & ~TSTATE_CCR) | PSRCC_TO_TSTATE(scp->sc_psr);
260 tf->tf_pc = scp->sc_pc;
261 tf->tf_npc = scp->sc_npc;
262 tf->tf_global[1] = scp->sc_g1;
263 tf->tf_out[0] = scp->sc_o0;
264 tf->tf_out[6] = scp->sc_sp;
265 #ifdef DEBUG
266 if (sigdebug & SDB_FOLLOW) {
267 printf("sunos_sigreturn: return trapframe pc=%p sp=%p tstate=%llx\n",
268 (void *)(u_long)tf->tf_pc, (void *)(u_long)tf->tf_out[6], (unsigned long long)tf->tf_tstate);
269 #ifdef DDB
270 if (sigdebug & SDB_DDB) Debugger();
271 #endif
272 }
273 #endif
274
275 mutex_enter(p->p_lock);
276 if (scp->sc_onstack & SS_ONSTACK)
277 l->l_sigstk.ss_flags |= SS_ONSTACK;
278 else
279 l->l_sigstk.ss_flags &= ~SS_ONSTACK;
280 /* Restore signal mask */
281 native_sigset13_to_sigset(&scp->sc_mask, &mask);
282 (void) sigprocmask1(l, SIG_SETMASK, &mask, 0);
283 mutex_exit(p->p_lock);
284
285 return (EJUSTRETURN);
286 }
287