1 /* $NetBSD: sig_machdep.c,v 1.10 2004/07/02 12:32:16 simonb Exp $ */ 2 3 /*- 4 * Copyright (c) 2003 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Christos Zoulas. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 #include <sys/cdefs.h> /* RCS ID & Copyright macro defns */ 40 41 __KERNEL_RCSID(0, "$NetBSD: sig_machdep.c,v 1.10 2004/07/02 12:32:16 simonb Exp $"); 42 43 #include "opt_cputype.h" 44 #include "opt_compat_netbsd.h" 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/kernel.h> 49 #include <sys/proc.h> 50 #include <sys/user.h> 51 #include <sys/signal.h> 52 #include <sys/signalvar.h> 53 #include <sys/mount.h> 54 #include <sys/sa.h> 55 #include <sys/syscallargs.h> 56 57 #include <machine/cpu.h> 58 59 #include <mips/frame.h> 60 #include <mips/regnum.h> 61 62 void * 63 getframe(struct lwp *l, int sig, int *onstack) 64 { 65 struct proc *p = l->l_proc; 66 struct sigctx *ctx = &p->p_sigctx; 67 struct frame *fp = l->l_md.md_regs; 68 69 /* Do we need to jump onto the signal stack? */ 70 *onstack = (ctx->ps_sigstk.ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 71 && (SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0; 72 if (*onstack) 73 return (char *)ctx->ps_sigstk.ss_sp + ctx->ps_sigstk.ss_size; 74 else 75 return (void *)fp->f_regs[_R_SP]; 76 } 77 78 struct sigframe_siginfo { 79 siginfo_t sf_si; 80 ucontext_t sf_uc; 81 }; 82 83 /* 84 * Send a signal to process. 85 */ 86 static void 87 sendsig_siginfo(const ksiginfo_t *ksi, const sigset_t *mask) 88 { 89 struct lwp *l = curlwp; 90 struct proc *p = l->l_proc; 91 struct sigacts *ps = p->p_sigacts; 92 int onstack; 93 int sig = ksi->ksi_signo; 94 struct sigframe_siginfo *fp = getframe(l, sig, &onstack); 95 struct frame *tf; 96 ucontext_t uc; 97 size_t ucsz; 98 sig_t catcher = SIGACTION(p, sig).sa_handler; 99 100 tf = (struct frame *)l->l_md.md_regs; 101 fp--; 102 103 /* Build stack frame for signal trampoline. */ 104 switch (ps->sa_sigdesc[sig].sd_vers) { 105 case 0: /* handled by sendsig_sigcontext */ 106 case 1: /* handled by sendsig_sigcontext */ 107 default: /* unknown version */ 108 printf("sendsig_siginfo: bad version %d\n", 109 ps->sa_sigdesc[sig].sd_vers); 110 sigexit(l, SIGILL); 111 case 2: 112 break; 113 } 114 115 uc.uc_flags = _UC_SIGMASK 116 | ((p->p_sigctx.ps_sigstk.ss_flags & SS_ONSTACK) 117 ? _UC_SETSTACK : _UC_CLRSTACK); 118 uc.uc_sigmask = *mask; 119 uc.uc_link = NULL; 120 memset(&uc.uc_stack, 0, sizeof(uc.uc_stack)); 121 cpu_getmcontext(l, &uc.uc_mcontext, &uc.uc_flags); 122 ucsz = (char *)&uc.__uc_pad - (char *)&uc; 123 124 if (copyout(&ksi->ksi_info, &fp->sf_si, sizeof(ksi->ksi_info)) != 0 || 125 copyout(&uc, &fp->sf_uc, ucsz) != 0) { 126 /* 127 * Process has trashed its stack; give it an illegal 128 * instruction to halt it in its tracks. 129 */ 130 sigexit(l, SIGILL); 131 /* NOTREACHED */ 132 } 133 134 /* 135 * Set up the registers to directly invoke the signal 136 * handler. The return address will be set up to point 137 * to the signal trampoline to bounce us back. 138 */ 139 tf->f_regs[_R_A0] = sig; 140 tf->f_regs[_R_A1] = (__greg_t)&fp->sf_si; 141 tf->f_regs[_R_A2] = (__greg_t)&fp->sf_uc; 142 143 tf->f_regs[_R_PC] = (__greg_t)catcher; 144 tf->f_regs[_R_T9] = (__greg_t)catcher; 145 tf->f_regs[_R_SP] = (__greg_t)fp; 146 tf->f_regs[_R_RA] = (__greg_t)ps->sa_sigdesc[sig].sd_tramp; 147 148 /* Remember that we're now on the signal stack. */ 149 if (onstack) 150 p->p_sigctx.ps_sigstk.ss_flags |= SS_ONSTACK; 151 } 152 153 void 154 sendsig(const ksiginfo_t *ksi, const sigset_t *mask) 155 { 156 #ifdef COMPAT_16 157 if (curproc->p_sigacts->sa_sigdesc[ksi->ksi_signo].sd_vers < 2) 158 sendsig_sigcontext(ksi, mask); 159 else 160 #endif 161 sendsig_siginfo(ksi, mask); 162 } 163