/* $NetBSD: sig_machdep.c,v 1.27 2024/05/17 21:37:07 thorpej Exp $ */ /* * Copyright (c) 1982, 1986, 1990 The Regents of the University of California. * All rights reserved. * * Changed for the VAX port (and for readability) /IC * * This code is derived from software contributed to Berkeley by the Systems * Programming Group of the University of Utah Computer Science Department. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * from: Utah Hdr: machdep.c 1.63 91/04/24 * * @(#)machdep.c 7.16 (Berkeley) 6/3/91 */ /* * Copyright (c) 2002, Hugh Graham. * Copyright (c) 1994, 1998 Ludd, University of Lule}, Sweden. * Copyright (c) 1993 Adam Glass * Copyright (c) 1988 University of Utah. * * Changed for the VAX port (and for readability) /IC * * This code is derived from software contributed to Berkeley by the Systems * Programming Group of the University of Utah Computer Science Department. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * from: Utah Hdr: machdep.c 1.63 91/04/24 * * @(#)machdep.c 7.16 (Berkeley) 6/3/91 */ #include <sys/cdefs.h> __KERNEL_RCSID(0, "$NetBSD: sig_machdep.c,v 1.27 2024/05/17 21:37:07 thorpej Exp $"); #include "opt_ddb.h" #include "opt_compat_netbsd.h" #include "opt_compat_ultrix.h" #include "opt_multiprocessor.h" #include "opt_lockdebug.h" #include <sys/param.h> #include <sys/systm.h> #include <sys/cpu.h> #include <sys/proc.h> #include <sys/signal.h> #include <machine/macros.h> #include <machine/reg.h> #ifdef DDB #include <machine/db_machdep.h> #include <ddb/db_sym.h> #include <ddb/db_extern.h> #endif typedef vaddr_t (*sig_setupstack_t)(const struct ksiginfo *, const sigset_t *, int, struct lwp *, struct trapframe *, vaddr_t, int, vaddr_t); static vaddr_t setupstack_siginfo3(const struct ksiginfo *, const sigset_t *, int, struct lwp *, struct trapframe *, vaddr_t, int, vaddr_t); const static sig_setupstack_t sig_setupstacks[] = { #if defined(COMPAT_13) || defined(COMPAT_ULTRIX) setupstack_oldsigcontext, /* 0 */ setupstack_oldsigcontext, /* 1 */ #else 0, /* 0 */ 0, /* 1 */ #endif #if defined(COMPAT_16) || defined(COMPAT_ULTRIX) setupstack_sigcontext2, /* 2 */ #else 0, /* 2 */ #endif setupstack_siginfo3, /* 3 */ }; /* * Brief description of how sendsig() works: * A struct sigcontext is allocated on the user stack. The relevant * registers are saved in it. Below it is a struct trampframe constructed, it * is actually an argument list for callg. The user * stack pointer is put below all structs. * * The registers will contain when the signal handler is called: * pc, psl - Obvious * sp - An address below all structs * fp - The address of the signal handler * ap - The address to the callg frame * * The trampoline code will save r0-r5 before doing anything else. */ struct trampoline3 { unsigned int narg; /* Argument count (== 3) */ int sig; /* Signal number */ vaddr_t sip; /* Pointer to siginfo_t */ vaddr_t ucp; /* Pointer to ucontext_t */ }; static vaddr_t setupstack_siginfo3(const struct ksiginfo *ksi, const sigset_t *mask, int vers, struct lwp *l, struct trapframe *tf, vaddr_t sp, int onstack, vaddr_t handler) { struct trampoline3 tramp; struct proc * const p = l->l_proc; ucontext_t uc; bool error; /* * Arguments given to the signal handler. */ memset(&tramp, 0, sizeof(tramp)); tramp.narg = 3; tramp.sig = ksi->ksi_signo; sp -= sizeof(uc); tramp.ucp = sp; sp -= sizeof(siginfo_t); tramp.sip = sp; sp -= sizeof(tramp); /* Save register context. */ memset(&uc, 0, sizeof(uc)); uc.uc_flags = _UC_SIGMASK; uc.uc_sigmask = *mask; uc.uc_link = l->l_ctxlink; uc.uc_flags |= (l->l_sigstk.ss_flags & SS_ONSTACK) ? _UC_SETSTACK : _UC_CLRSTACK; sendsig_reset(l, ksi->ksi_signo); mutex_exit(p->p_lock); cpu_getmcontext(l, &uc.uc_mcontext, &uc.uc_flags); tf->tf_fp = handler; /* Copy the context to the stack. */ error = (copyout(&uc, (char *)tramp.ucp, sizeof(uc)) != 0 || copyout(&ksi->ksi_info, (char *)tramp.sip, sizeof(ksi->ksi_info)) != 0 || copyout(&tramp, (char *)sp, sizeof(tramp)) != 0); mutex_enter(p->p_lock); if (error) sigexit(l, SIGILL); return sp; }; void sendsig_sighelper(const ksiginfo_t *ksi, const sigset_t *mask) { struct lwp * const l = curlwp; struct proc * const p = l->l_proc; struct trapframe * const tf = l->l_md.md_utf; stack_t * const ss = &l->l_sigstk; const struct sigact_sigdesc * const sd = &p->p_sigacts->sa_sigdesc[ksi->ksi_signo]; vaddr_t sp; int onstack; sig_setupstack_t setup; /* Figure what stack we are running on. */ onstack = (ss->ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 && (sd->sd_sigact.sa_flags & SA_ONSTACK) != 0; sp = onstack ? ((vaddr_t)ss->ss_sp + ss->ss_size) : tf->tf_sp; if (sd->sd_vers > __SIGTRAMP_SIGINFO_VERSION || (setup = sig_setupstacks[sd->sd_vers]) == NULL) goto nosupport; sp = (*setup)(ksi, mask, sd->sd_vers, l, tf, sp, onstack, (vaddr_t)sd->sd_sigact.sa_handler); if (sp == 0) goto nosupport; if (sd->sd_vers == 0) tf->tf_pc = (register_t)p->p_sigctx.ps_sigcode; else tf->tf_pc = (register_t)sd->sd_tramp; tf->tf_psl = PSL_U | PSL_PREVU; tf->tf_sp = sp; tf->tf_ap = sp; if (onstack) ss->ss_flags |= SS_ONSTACK; return; nosupport: /* Don't know what trampoline version; kill it. */ printf("sendsig(sig %d): bad version %d\n", ksi->ksi_signo, sd->sd_vers); sigexit(l, SIGILL); }
