/* $NetBSD: compat_16_machdep.c,v 1.21 2023/03/04 08:52:19 skrll Exp $ */ /* * Copyright (c) 1994-1998 Mark Brinicombe. * Copyright (c) 1994 Brini. * All rights reserved. * * This code is derived from software written for Brini by Mark Brinicombe * * 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. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by Mark Brinicombe * for the NetBSD Project. * 4. The name of the company nor the name of the author may be used to * endorse or promote products derived from this software without specific * prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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. * * Machine dependent functions for kernel setup * * Created : 17/09/94 */ #include <sys/cdefs.h> __KERNEL_RCSID(0, "$NetBSD: compat_16_machdep.c,v 1.21 2023/03/04 08:52:19 skrll Exp $"); #ifdef _KERNEL_OPT #include "opt_compat_netbsd.h" #include "opt_armfpe.h" #endif #include <sys/param.h> #include <sys/mount.h> /* XXX only needed by syscallargs.h */ #include <sys/proc.h> #include <sys/signal.h> #include <sys/syscallargs.h> #include <sys/systm.h> #include <sys/ras.h> #include <sys/ucontext.h> #include <arm/armreg.h> #include <arm/locore.h> #include <machine/cpu.h> #include <machine/frame.h> #include <arm/cpufunc.h> /* * Send an interrupt to process. * * Stack is set up to allow sigcode stored * in u. to call routine, followed by kcall * to sigreturn routine below. After sigreturn * resets the signal mask, the stack, and the * frame pointer, it returns to the user specified pc. */ #if defined(COMPAT_16) || defined(COMPAT_13) #include <compat/sys/signal.h> #include <compat/sys/signalvar.h> void sendsig_sigcontext(const ksiginfo_t *ksi, const sigset_t *mask) { struct lwp * const l = curlwp; struct proc * const p = l->l_proc; struct sigacts * const ps = p->p_sigacts; struct trapframe * const tf = lwp_trapframe(l); struct sigframe_sigcontext *fp, frame; int onstack, error; int sig = ksi->ksi_signo; u_long code = KSI_TRAPCODE(ksi); sig_t catcher = SIGACTION(p, sig).sa_handler; fp = getframe(l, sig, &onstack); /* make room on the stack */ fp--; /* make the stack aligned */ fp = (void *)STACK_ALIGN(fp, STACK_ALIGNBYTES); /* Save register context. */ frame.sf_sc.sc_r0 = tf->tf_r0; frame.sf_sc.sc_r1 = tf->tf_r1; frame.sf_sc.sc_r2 = tf->tf_r2; frame.sf_sc.sc_r3 = tf->tf_r3; frame.sf_sc.sc_r4 = tf->tf_r4; frame.sf_sc.sc_r5 = tf->tf_r5; frame.sf_sc.sc_r6 = tf->tf_r6; frame.sf_sc.sc_r7 = tf->tf_r7; frame.sf_sc.sc_r8 = tf->tf_r8; frame.sf_sc.sc_r9 = tf->tf_r9; frame.sf_sc.sc_r10 = tf->tf_r10; frame.sf_sc.sc_r11 = tf->tf_r11; frame.sf_sc.sc_r12 = tf->tf_r12; frame.sf_sc.sc_usr_sp = tf->tf_usr_sp; frame.sf_sc.sc_usr_lr = tf->tf_usr_lr; frame.sf_sc.sc_svc_lr = tf->tf_svc_lr; frame.sf_sc.sc_pc = tf->tf_pc; frame.sf_sc.sc_spsr = tf->tf_spsr; /* Save signal stack. */ frame.sf_sc.sc_onstack = l->l_sigstk.ss_flags & SS_ONSTACK; /* Save signal mask. */ frame.sf_sc.sc_mask = *mask; #ifdef COMPAT_13 /* * XXX We always have to save an old style signal mask because * XXX we might be delivering a signal to a process which will * XXX escape from the signal in a non-standard way and invoke * XXX sigreturn() directly. */ native_sigset_to_sigset13(mask, &frame.sf_sc.__sc_mask13); #endif sendsig_reset(l, sig); mutex_exit(p->p_lock); error = copyout(&frame, fp, sizeof(frame)); mutex_enter(p->p_lock); if (error != 0) { /* * Process has trashed its stack; give it an illegal * instruction to halt it in its tracks. */ sigexit(l, SIGILL); /* NOTREACHED */ } /* * Build context to run handler in. We invoke the handler * directly, only returning via the trampoline. Note the * trampoline version numbers are coordinated with machine- * dependent code in libc. */ /* * this was all in the switch below, seemed daft to duplicate it, if * we do a new trampoline version it might change then */ tf->tf_r0 = sig; tf->tf_r1 = code; tf->tf_r2 = (int)&fp->sf_sc; tf->tf_pc = (int)catcher; #ifdef THUMB_CODE if (((int) catcher) & 1) tf->tf_spsr |= PSR_T_bit; else tf->tf_spsr &= ~PSR_T_bit; #endif tf->tf_usr_sp = (int)fp; switch (ps->sa_sigdesc[sig].sd_vers) { case __SIGTRAMP_SIGCODE_VERSION: /* legacy on-stack sigtramp */ tf->tf_usr_lr = (int)p->p_sigctx.ps_sigcode; /* XXX This should not be needed. */ cpu_icache_sync_all(); break; case __SIGTRAMP_SIGCONTEXT_VERSION: tf->tf_usr_lr = (int)ps->sa_sigdesc[sig].sd_tramp; break; default: /* Don't know what trampoline version; kill it. */ sigexit(l, SIGILL); } /* Remember that we're now on the signal stack. */ if (onstack) l->l_sigstk.ss_flags |= SS_ONSTACK; } /* * System call to cleanup state after a signal * has been taken. Reset signal mask and * stack state from context left by sendsig (above). * Return to previous pc and psl as specified by * context left by sendsig. Check carefully to * make sure that the user has not modified the * psr to gain improper privileges or to cause * a machine fault. */ int compat_16_sys___sigreturn14(struct lwp *l, const struct compat_16_sys___sigreturn14_args *uap, register_t *retval) { /* { syscallarg(struct sigcontext *) sigcntxp; } */ struct trapframe * const tf = lwp_trapframe(l); struct proc * const p = l->l_proc; struct sigcontext *scp, context; /* * we do a rather scary test in userland */ if (uap == NULL) return (EFAULT); /* * The trampoline code hands us the context. * It is unsafe to keep track of it ourselves, in the event that a * program jumps out of a signal handler. */ scp = SCARG(uap, sigcntxp); if (copyin((void *)scp, &context, sizeof(*scp)) != 0) return (EFAULT); /* * Make sure the processor mode has not been tampered with and * interrupts have not been disabled. */ if (!VALID_PSR(context.sc_spsr)) return EINVAL; /* Restore register context. */ tf->tf_r0 = context.sc_r0; tf->tf_r1 = context.sc_r1; tf->tf_r2 = context.sc_r2; tf->tf_r3 = context.sc_r3; tf->tf_r4 = context.sc_r4; tf->tf_r5 = context.sc_r5; tf->tf_r6 = context.sc_r6; tf->tf_r7 = context.sc_r7; tf->tf_r8 = context.sc_r8; tf->tf_r9 = context.sc_r9; tf->tf_r10 = context.sc_r10; tf->tf_r11 = context.sc_r11; tf->tf_r12 = context.sc_r12; tf->tf_usr_sp = context.sc_usr_sp; tf->tf_usr_lr = context.sc_usr_lr; tf->tf_svc_lr = context.sc_svc_lr; tf->tf_pc = context.sc_pc; tf->tf_spsr = context.sc_spsr; mutex_enter(p->p_lock); /* Restore signal stack. */ if (context.sc_onstack & SS_ONSTACK) l->l_sigstk.ss_flags |= SS_ONSTACK; else l->l_sigstk.ss_flags &= ~SS_ONSTACK; /* Restore signal mask. */ (void) sigprocmask1(l, SIG_SETMASK, &context.sc_mask, 0); mutex_exit(p->p_lock); return (EJUSTRETURN); } #endif
