1 /* $NetBSD: sunos_machdep.c,v 1.25 2025/04/24 01:52:38 riastradh 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 1.25 2025/04/24 01:52:38 riastradh Exp $");
31
32 #if defined(_KERNEL_OPT)
33 #include "opt_compat_netbsd.h"
34 #endif
35
36 #include <sys/param.h>
37 #include <sys/systm.h>
38 #include <sys/proc.h>
39 #include <sys/kernel.h>
40 #include <sys/mount.h>
41 #include <sys/signal.h>
42 #include <sys/signalvar.h>
43
44 #include <compat/sys/signal.h>
45 #include <compat/sys/signalvar.h>
46
47 #include <sys/syscallargs.h>
48 #include <compat/sunos/sunos.h>
49 #include <compat/sunos/sunos_syscallargs.h>
50
51 #include <machine/frame.h>
52 #include <machine/cpu.h>
53
54 #ifdef DEBUG
55 int sunos_sigdebug = 0;
56 int sunos_sigpid = 0;
57 #define SDB_FOLLOW 0x01
58 #define SDB_KSTACK 0x02
59 #define SDB_FPSTATE 0x04
60 #endif
61
62 struct sunos_sigframe {
63 int sf_signo; /* signal number */
64 int sf_code; /* code */
65 struct sigcontext13 *sf_scp; /* SunOS user addr of sigcontext */
66 int sf_addr; /* SunOS compat, always 0 for now */
67 struct sigcontext13 sf_sc; /* actual sigcontext */
68 };
69
sunos_sendsig(const ksiginfo_t * ksi,const sigset_t * mask)70 void sunos_sendsig(const ksiginfo_t *ksi, const sigset_t *mask)
71 {
72 struct lwp *l = curlwp;
73 struct proc *p = l->l_proc;
74 struct sunos_sigframe *fp;
75 struct trapframe *tf;
76 int addr, onstack, oldsp, newsp, error;
77 int sig = ksi->ksi_signo;
78 u_long code = ksi->ksi_code;
79 sig_t catcher = SIGACTION(p, sig).sa_handler;
80 struct sunos_sigframe sf;
81
82 tf = l->l_md.md_tf;
83 oldsp = tf->tf_out[6];
84
85 /*
86 * Compute new user stack addresses, subtract off
87 * one signal frame, and align.
88 */
89 onstack =
90 (l->l_sigstk.ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 &&
91 (SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0;
92
93 if (onstack)
94 fp = (struct sunos_sigframe *)
95 ((char *)l->l_sigstk.ss_sp + l->l_sigstk.ss_size);
96 else
97 fp = (struct sunos_sigframe *)oldsp;
98
99 fp = (struct sunos_sigframe *)((int)(fp - 1) & ~STACK_ALIGNBYTES);
100
101 #ifdef DEBUG
102 if ((sunos_sigdebug & SDB_KSTACK) && p->p_pid == sunos_sigpid)
103 printf("sendsig: %s[%d] sig %d newusp %p scp %p\n",
104 p->p_comm, p->p_pid, sig, fp, &fp->sf_sc);
105 #endif
106 /*
107 * Now set up the signal frame. We build it in kernel space
108 * and then copy it out. We probably ought to just build it
109 * directly in user space....
110 */
111 sf.sf_signo = sig;
112 sf.sf_code = code;
113 sf.sf_scp = &fp->sf_sc;
114 sf.sf_addr = 0; /* XXX */
115
116 /*
117 * Build the signal context to be used by sigreturn.
118 */
119 sf.sf_sc.sc_onstack = l->l_sigstk.ss_flags & SS_ONSTACK;
120 native_sigset_to_sigset13(mask, &sf.sf_sc.sc_mask);
121 sf.sf_sc.sc_sp = oldsp;
122 sf.sf_sc.sc_pc = tf->tf_pc;
123 sf.sf_sc.sc_npc = tf->tf_npc;
124 sf.sf_sc.sc_psr = tf->tf_psr;
125 sf.sf_sc.sc_g1 = tf->tf_global[1];
126 sf.sf_sc.sc_o0 = tf->tf_out[0];
127
128 /*
129 * Put the stack in a consistent state before we whack away
130 * at it. Note that write_user_windows may just dump the
131 * registers into the pcb; we need them in the process's memory.
132 * We also need to make sure that when we start the signal handler,
133 * its %i6 (%fp), which is loaded from the newly allocated stack area,
134 * joins seamlessly with the frame it was in when the signal occurred,
135 * so that the debugger and _longjmp code can back up through it.
136 */
137 sendsig_reset(l, sig);
138 mutex_exit(p->p_lock);
139 newsp = (int)fp - sizeof(struct rwindow);
140 write_user_windows();
141 error = (rwindow_save(l) || copyout((void *)&sf, (void *)fp, sizeof sf) ||
142 ustore_int((u_int *)&((struct rwindow *)newsp)->rw_in[6], oldsp));
143 mutex_enter(p->p_lock);
144
145 if (error) {
146 /*
147 * Process has trashed its stack; give it an illegal
148 * instruction to halt it in its tracks.
149 */
150 #ifdef DEBUG
151 if ((sunos_sigdebug & SDB_KSTACK) && p->p_pid == sunos_sigpid)
152 printf("sendsig: window save or copyout error\n");
153 #endif
154 sigexit(l, SIGILL);
155 /* NOTREACHED */
156 }
157 #ifdef DEBUG
158 if (sunos_sigdebug & SDB_FOLLOW)
159 printf("sendsig: %s[%d] sig %d scp %p\n",
160 p->p_comm, p->p_pid, sig, &fp->sf_sc);
161 #endif
162 /*
163 * Arrange to continue execution at the code copied out in exec().
164 * It needs the function to call in %g1, and a new stack pointer.
165 */
166 addr = (int)catcher; /* user does his own trampolining */
167 tf->tf_pc = addr;
168 tf->tf_npc = addr + 4;
169 tf->tf_out[6] = newsp;
170
171 /* Remember that we're now on the signal stack. */
172 if (onstack)
173 l->l_sigstk.ss_flags |= SS_ONSTACK;
174
175 #ifdef DEBUG
176 if ((sunos_sigdebug & SDB_KSTACK) && p->p_pid == sunos_sigpid)
177 printf("sendsig: about to return to catcher\n");
178 #endif
179 }
180
181 int
sunos_sys_sigreturn(struct lwp * l,const struct sunos_sys_sigreturn_args * uap,register_t * retval)182 sunos_sys_sigreturn(struct lwp *l, const struct sunos_sys_sigreturn_args *uap, register_t *retval)
183 {
184
185 return (compat_13_sys_sigreturn(l,
186 (const struct compat_13_sys_sigreturn_args *)uap, retval));
187 }
188