Annotation of src/sys/arch/powerpc/powerpc/compat_16_machdep.c, Revision 1.11.10.1
1.11.10.1! skrll 1: /* $NetBSD: compat_16_machdep.c,v 1.12 2008/11/21 20:21:12 he Exp $ */
1.1 matt 2:
3: /*
4: * Copyright (C) 1995, 1996 Wolfgang Solfrank.
5: * Copyright (C) 1995, 1996 TooLs GmbH.
6: * All rights reserved.
7: *
8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following conditions
10: * are met:
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in the
15: * documentation and/or other materials provided with the distribution.
16: * 3. All advertising materials mentioning features or use of this software
17: * must display the following acknowledgement:
18: * This product includes software developed by TooLs GmbH.
19: * 4. The name of TooLs GmbH may not be used to endorse or promote products
20: * derived from this software without specific prior written permission.
21: *
22: * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
23: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
24: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
25: * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
26: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
27: * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
28: * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
29: * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
30: * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
31: * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32: */
33:
34: #include <sys/cdefs.h>
1.11.10.1! skrll 35: __KERNEL_RCSID(0, "$NetBSD: compat_16_machdep.c,v 1.12 2008/11/21 20:21:12 he Exp $");
1.1 matt 36:
1.11.10.1! skrll 37: #ifdef _KERNEL_OPT
1.1 matt 38: #include "opt_compat_netbsd.h"
1.4 matt 39: #include "opt_altivec.h"
1.1 matt 40: #include "opt_ppcarch.h"
1.11.10.1! skrll 41: #endif
1.1 matt 42:
43: #include <sys/param.h>
44: #include <sys/mount.h>
45: #include <sys/proc.h>
46: #include <sys/syscallargs.h>
47: #include <sys/systm.h>
48: #include <sys/ucontext.h>
49: #include <sys/user.h>
50:
1.5 he 51: #include <compat/sys/signal.h>
52: #include <compat/sys/signalvar.h>
53:
1.1 matt 54: #include <machine/fpu.h>
55:
56: /*
57: * Send a signal to process.
58: */
59: void
1.11.10.1! skrll 60: sendsig_sigcontext(const ksiginfo_t *ksi, const sigset_t *mask)
1.1 matt 61: {
62: struct lwp *l = curlwp;
63: struct proc *p = l->l_proc;
64: struct sigacts *ps = p->p_sigacts;
65: struct sigcontext *fp, frame;
66: struct trapframe *tf;
67: struct utrapframe *utf = &frame.sc_frame;
1.7 ad 68: int onstack, error;
1.11.10.1! skrll 69: int sig = ksi->ksi_signo;
! 70: u_long code = KSI_TRAPCODE(ksi);
1.1 matt 71: sig_t catcher = SIGACTION(p, sig).sa_handler;
72:
73: tf = trapframe(l);
74:
75: /* Do we need to jump onto the signal stack? */
76: onstack =
1.7 ad 77: (l->l_sigstk.ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 &&
1.1 matt 78: (SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0;
79:
80: /* Allocate space for the signal handler context. */
81: if (onstack)
1.9 tsutsui 82: fp = (struct sigcontext *)((char *)l->l_sigstk.ss_sp +
1.7 ad 83: l->l_sigstk.ss_size);
1.1 matt 84: else
85: fp = (struct sigcontext *)tf->fixreg[1];
86: fp = (struct sigcontext *)((uintptr_t)(fp - 1) & ~0xf);
87:
88: /* Save register context. */
89: memcpy(utf->fixreg, tf->fixreg, sizeof(utf->fixreg));
90: utf->lr = tf->lr;
91: utf->cr = tf->cr;
92: utf->xer = tf->xer;
93: utf->ctr = tf->ctr;
94: utf->srr0 = tf->srr0;
1.4 matt 95: utf->srr1 = tf->srr1 & PSL_USERSRR1;
1.3 matt 96: #ifdef PPC_HAVE_FPU
97: utf->srr1 |= l->l_addr->u_pcb.pcb_flags & (PCB_FE0|PCB_FE1);
98: #endif
1.4 matt 99: #ifdef ALTIVEC
100: utf->srr1 |= l->l_addr->u_pcb.pcb_flags & PCB_ALTIVEC ? PSL_VEC : 0;
101: #endif
1.1 matt 102: #ifdef PPC_OEA
103: utf->vrsave = tf->tf_xtra[TF_VRSAVE];
104: utf->mq = tf->tf_xtra[TF_MQ];
105: #endif
106:
107: /* Save signal stack. */
1.7 ad 108: frame.sc_onstack = l->l_sigstk.ss_flags & SS_ONSTACK;
1.1 matt 109:
110: /* Save signal mask. */
111: frame.sc_mask = *mask;
112:
113: #ifdef COMPAT_13
114: /*
115: * XXX We always have to save an old style signal mask because
116: * XXX we might be delivering a signal to a process which will
117: * XXX escape from the signal in a non-standard way and invoke
118: * XXX sigreturn() directly.
119: */
120: native_sigset_to_sigset13(mask, &frame.__sc_mask13);
121: #endif
1.7 ad 122: sendsig_reset(l, sig);
1.11 ad 123: mutex_exit(p->p_lock);
1.7 ad 124: error = copyout(&frame, fp, sizeof frame);
1.11 ad 125: mutex_enter(p->p_lock);
1.1 matt 126:
1.7 ad 127: if (error != 0) {
1.1 matt 128: /*
129: * Process has trashed its stack; give it an illegal
130: * instructoin to halt it in its tracks.
131: */
132: sigexit(l, SIGILL);
133: /* NOTREACHED */
134: }
135:
136: /*
137: * Build context to run handler in. Note the trampoline version
138: * numbers are coordinated with machine-dependent code in libc.
139: */
140: switch (ps->sa_sigdesc[sig].sd_vers) {
141: #if 1 /* COMPAT_16 */
142: case 0: /* legacy on-stack sigtramp */
143: tf->fixreg[1] = (register_t)fp;
144: tf->lr = (register_t)catcher;
145: tf->fixreg[3] = (register_t)sig;
146: tf->fixreg[4] = (register_t)code;
147: tf->fixreg[5] = (register_t)fp;
148: tf->srr0 = (register_t)p->p_sigctx.ps_sigcode;
149: break;
150: #endif /* COMPAT_16 */
151:
152: case 1:
153: tf->fixreg[1] = (register_t)fp;
154: tf->lr = (register_t)catcher;
155: tf->fixreg[3] = (register_t)sig;
156: tf->fixreg[4] = (register_t)code;
157: tf->fixreg[5] = (register_t)fp;
158: tf->srr0 = (register_t)ps->sa_sigdesc[sig].sd_tramp;
159: break;
160:
161: default:
162: /* Don't know what trampoline version; kill it. */
163: sigexit(l, SIGILL);
164: }
165:
166: /* Remember that we're now on the signal stack. */
167: if (onstack)
1.7 ad 168: l->l_sigstk.ss_flags |= SS_ONSTACK;
1.1 matt 169: }
170:
171: /*
172: * System call to cleanup state after a signal handler returns.
173: */
174: int
1.10 dsl 175: compat_16_sys___sigreturn14(struct lwp *l, const struct compat_16_sys___sigreturn14_args *uap, register_t *retval)
1.1 matt 176: {
1.10 dsl 177: /* {
1.1 matt 178: syscallarg(struct sigcontext *) sigcntxp;
1.10 dsl 179: } */
1.1 matt 180: struct proc *p = l->l_proc;
181: struct sigcontext sc;
182: struct trapframe *tf;
183: struct utrapframe * const utf = &sc.sc_frame;
184: int error;
185:
186: /*
187: * The trampoline hands us the context.
188: * It is unsafe to keep track of it ourselves, in the event that a
189: * program jumps out of a signal hander.
190: */
191: if ((error = copyin(SCARG(uap, sigcntxp), &sc, sizeof sc)) != 0)
192: return (error);
193:
194: /* Restore the register context. */
195: tf = trapframe(l);
1.4 matt 196:
197: /*
198: * Make sure SRR1 hasn't been maliciously tampered with.
199: */
200: if (!PSL_USEROK_P(sc.sc_frame.srr1))
1.1 matt 201: return (EINVAL);
202:
203: /* Restore register context. */
204: memcpy(tf->fixreg, utf->fixreg, sizeof(tf->fixreg));
205: tf->lr = utf->lr;
206: tf->cr = utf->cr;
207: tf->xer = utf->xer;
208: tf->ctr = utf->ctr;
209: tf->srr0 = utf->srr0;
210: tf->srr1 = utf->srr1;
1.3 matt 211: #ifdef PPC_HAVE_FPU
212: l->l_addr->u_pcb.pcb_flags &= ~(PCB_FE0|PCB_FE1);
213: l->l_addr->u_pcb.pcb_flags |= utf->srr1 & (PCB_FE0|PCB_FE1);
214: #endif
1.1 matt 215: #ifdef PPC_OEA
216: tf->tf_xtra[TF_VRSAVE] = utf->vrsave;
217: tf->tf_xtra[TF_MQ] = utf->mq;
218: #endif
219:
1.11 ad 220: mutex_enter(p->p_lock);
1.1 matt 221: /* Restore signal stack. */
222: if (sc.sc_onstack & SS_ONSTACK)
1.7 ad 223: l->l_sigstk.ss_flags |= SS_ONSTACK;
1.1 matt 224: else
1.7 ad 225: l->l_sigstk.ss_flags &= ~SS_ONSTACK;
1.1 matt 226: /* Restore signal mask. */
1.7 ad 227: (void) sigprocmask1(l, SIG_SETMASK, &sc.sc_mask, 0);
1.11 ad 228: mutex_exit(p->p_lock);
1.1 matt 229:
230: return (EJUSTRETURN);
231: }
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