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      1 /*	$NetBSD: sunos32_machdep.c,v 1.33 2016/07/07 06:55:38 msaitoh Exp $	*/
      2 /* from: NetBSD: sunos_machdep.c,v 1.14 2001/01/29 01:37:56 mrg Exp 	*/
      3 
      4 /*
      5  * Copyright (c) 1995, 2001 Matthew R. Green
      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  *
     17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
     22  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     23  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
     24  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     25  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     27  * SUCH DAMAGE.
     28  */
     29 
     30 #include <sys/cdefs.h>
     31 __KERNEL_RCSID(0, "$NetBSD: sunos32_machdep.c,v 1.33 2016/07/07 06:55:38 msaitoh Exp $");
     32 
     33 #ifdef _KERNEL_OPT
     34 #include "opt_ddb.h"
     35 #include "firm_events.h"
     36 #endif
     37 
     38 #include <sys/param.h>
     39 #include <sys/exec.h>
     40 #include <sys/systm.h>
     41 #include <sys/proc.h>
     42 #include <sys/namei.h>
     43 #include <sys/filedesc.h>
     44 #include <sys/ioctl.h>
     45 #include <sys/mount.h>
     46 #include <sys/kernel.h>
     47 #include <sys/signal.h>
     48 #include <sys/signalvar.h>
     49 #include <sys/select.h>
     50 
     51 #include <sys/syscallargs.h>
     52 #include <compat/sunos/sunos.h>
     53 #include <compat/sunos/sunos_syscallargs.h>
     54 #include <compat/netbsd32/netbsd32.h>
     55 #include <compat/sunos32/sunos32.h>
     56 #include <compat/sunos32/sunos32_syscallargs.h>
     57 #include <compat/sunos32/sunos32_exec.h>
     58 
     59 #include <compat/sys/signal.h>
     60 #include <compat/sys/signalvar.h>
     61 
     62 #include <machine/frame.h>
     63 #include <machine/cpu.h>
     64 #include <machine/vuid_event.h>
     65 #include <machine/reg.h>
     66 
     67 #include <dev/sun/event_var.h>
     68 
     69 #ifdef DEBUG
     70 #include <sparc64/sparc64/sigdebug.h>
     71 #endif
     72 
     73 struct sunos32_sigcontext {
     74 	uint32_t	sc_onstack;		/* sigstack state to restore */
     75 	uint32_t	sc_mask;		/* signal mask to restore (old style) */
     76 	/* begin machine dependent portion */
     77 	uint32_t	sc_sp;			/* %sp to restore */
     78 	uint32_t	sc_pc;			/* pc to restore */
     79 	uint32_t	sc_npc;			/* npc to restore */
     80 	uint32_t	sc_psr;			/* pstate to restore */
     81 	uint32_t	sc_g1;			/* %g1 to restore */
     82 	uint32_t	sc_o0;			/* %o0 to restore */
     83 };
     84 
     85 struct sunos32_sigframe {
     86 	uint32_t	sf_signo;		/* signal number */
     87 	uint32_t	sf_code;		/* code */
     88 	uint32_t	sf_scp;			/* SunOS user addr of sigcontext */
     89 	uint32_t	sf_addr;		/* SunOS compat, always 0 for now */
     90 	struct	sunos32_sigcontext sf_sc;	/* actual sigcontext */
     91 };
     92 
     93 #if NFIRM_EVENTS > 0
     94 static int ev_out32(struct firm_event *, int, struct uio *);
     95 #endif
     96 
     97 /*
     98  * Set up registers on exec.
     99  *
    100  * XXX this entire mess must be fixed
    101  */
    102 /* ARGSUSED */
    103 void
    104 sunos32_setregs(struct lwp *l, struct exec_package *pack, vaddr_t stack)
    105 	/* stack:  XXX */
    106 {
    107 	struct trapframe64 *tf = l->l_md.md_tf;
    108 	struct fpstate64 *fs;
    109 	int64_t tstate;
    110 	struct proc *p = l->l_proc;
    111 
    112 	/* Don't allow misaligned code by default */
    113 	p->p_md.md_flags &= ~MDP_FIXALIGN;
    114 
    115 	/* Mark this as a 32-bit emulation */
    116 	mutex_enter(p->p_lock);
    117 	p->p_flag |= PK_32;
    118 	mutex_exit(p->p_lock);
    119 
    120 	/* Setup the ev_out32 hook */
    121 #if NFIRM_EVENTS > 0
    122 	if (ev_out32_hook == NULL)
    123 		ev_out32_hook = ev_out32;
    124 #endif
    125 
    126 	/*
    127 	 * Set the registers to 0 except for:
    128 	 *	%o6: stack pointer, built in exec())
    129 	 *	%tstate: (retain icc and xcc and cwp bits)
    130 	 *	%g1: p->p_psstrp (used by crt0)
    131 	 *	%tpc,%tnpc: entry point of program
    132 	 */
    133 	tstate = ((PSTATE_USER32)<<TSTATE_PSTATE_SHIFT)
    134 		| (tf->tf_tstate & TSTATE_CWP);
    135 	if ((fs = l->l_md.md_fpstate) != NULL) {
    136 		/*
    137 		 * We hold an FPU state.  If we own *the* FPU chip state
    138 		 * we must get rid of it, and the only way to do that is
    139 		 * to save it.  In any case, get rid of our FPU state.
    140 		 */
    141 		if (l == fplwp) {
    142 			savefpstate(fs);
    143 			fplwp = NULL;
    144 		}
    145 		pool_cache_put(fpstate_cache, fs);
    146 		l->l_md.md_fpstate = NULL;
    147 	}
    148 	memset(tf, 0, sizeof *tf);
    149 	tf->tf_tstate = tstate;
    150 	tf->tf_global[1] = (u_int)p->p_psstrp;
    151 	tf->tf_pc = pack->ep_entry & ~3;
    152 	tf->tf_npc = tf->tf_pc + 4;
    153 
    154 	stack -= sizeof(struct rwindow32);
    155 	tf->tf_out[6] = stack;
    156 	tf->tf_out[7] = 0;
    157 }
    158 
    159 void
    160 sunos32_sendsig(const ksiginfo_t *ksi, const sigset_t *mask)
    161 {
    162 	int sig = ksi->ksi_signo;
    163 	struct lwp *l = curlwp;	/* XXX */
    164 	struct proc *p = l->l_proc;
    165 	struct sunos32_sigframe *fp;
    166 	struct trapframe64 *tf;
    167 	struct rwindow32 *oldsp, *newsp;
    168 	struct sunos32_sigframe sf;
    169 	struct sunos32_sigcontext *scp;
    170 	uint32_t addr, oldsp32;
    171 	int onstack, error;
    172 	sig_t catcher = SIGACTION(p, sig).sa_handler;
    173 
    174 	tf = l->l_md.md_tf;
    175 	/* Need to attempt to zero extend this 32-bit pointer */
    176 	oldsp = (struct rwindow32 *)(u_long)(u_int)tf->tf_out[6];
    177 	oldsp32 = (uint32_t)(u_long)oldsp;
    178 
    179 	/*
    180 	 * Compute new user stack addresses, subtract off
    181 	 * one signal frame, and align.
    182 	 */
    183 	onstack =
    184 	    (l->l_sigstk.ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 &&
    185 	    (SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0;
    186 
    187 	if (onstack)
    188 		fp = (struct sunos32_sigframe *)
    189 		     ((char *)l->l_sigstk.ss_sp + l->l_sigstk.ss_size);
    190 	else
    191 		fp = (struct sunos32_sigframe *)oldsp;
    192 
    193 	fp = (struct sunos32_sigframe *)((u_long)(fp - 1) & ~7);
    194 
    195 #ifdef DEBUG
    196 	sigpid = p->p_pid;
    197 	if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) {
    198 		mutex_exit(p->p_lock);
    199 		printf("sunos32_sendsig: %s[%d] sig %d newusp %p scp %p oldsp %p\n",
    200 		    p->p_comm, p->p_pid, sig, fp, &fp->sf_sc, oldsp);
    201 #ifdef DDB
    202 		if (sigdebug & SDB_DDB) Debugger();
    203 #endif
    204 		mutex_enter(p->p_lock);
    205 	}
    206 #endif
    207 	/*
    208 	 * Now set up the signal frame.  We build it in kernel space
    209 	 * and then copy it out.  We probably ought to just build it
    210 	 * directly in user space....
    211 	 */
    212 	sf.sf_signo = sig;
    213 	sf.sf_code = (uint32_t)ksi->ksi_trap;
    214 	scp = &fp->sf_sc;
    215 	if ((u_long)scp >= 0x100000000)
    216 		printf("sunos32_sendsig: sf_scp overflow %p > 0x100000000\n", scp);
    217 	sf.sf_scp = (uint32_t)(u_long)scp;
    218 	sf.sf_addr = 0;			/* XXX */
    219 
    220 	/*
    221 	 * Build the signal context to be used by sigreturn.
    222 	 */
    223 	sf.sf_sc.sc_onstack = l->l_sigstk.ss_flags & SS_ONSTACK;
    224 	native_sigset_to_sigset13(mask, &sf.sf_sc.sc_mask);
    225 	sf.sf_sc.sc_sp = (u_int)(u_long)oldsp;
    226 	sf.sf_sc.sc_pc = tf->tf_pc;
    227 	sf.sf_sc.sc_npc = tf->tf_npc;
    228 	sf.sf_sc.sc_psr = TSTATECCR_TO_PSR(tf->tf_tstate); /* XXX */
    229 	sf.sf_sc.sc_g1 = tf->tf_global[1];
    230 	sf.sf_sc.sc_o0 = tf->tf_out[0];
    231 
    232 	/*
    233 	 * Put the stack in a consistent state before we whack away
    234 	 * at it.  Note that write_user_windows may just dump the
    235 	 * registers into the pcb; we need them in the process's memory.
    236 	 * We also need to make sure that when we start the signal handler,
    237 	 * its %i6 (%fp), which is loaded from the newly allocated stack area,
    238 	 * joins seamlessly with the frame it was in when the signal occurred,
    239 	 * so that the debugger and _longjmp code can back up through it.
    240 	 */
    241 	sendsig_reset(l, sig);
    242 	mutex_exit(p->p_lock);
    243 	newsp = (struct rwindow32 *)((long)fp - sizeof(struct rwindow32));
    244 	write_user_windows();
    245 #ifdef DEBUG
    246 	if ((sigdebug & SDB_KSTACK))
    247 	    printf("sunos32_sendsig: saving sf to %p, setting stack pointer %p to %p\n",
    248 		   fp, &(((struct rwindow32 *)newsp)->rw_in[6]), oldsp);
    249 #endif
    250 	error = (rwindow_save(l) || copyout((void *)&sf, (void *)fp, sizeof sf) ||
    251 	    copyout((void *)&oldsp32, &(((struct rwindow32 *)newsp)->rw_in[6]), sizeof oldsp32));
    252 	mutex_enter(p->p_lock);
    253 	if (error) {
    254 		/*
    255 		 * Process has trashed its stack; give it an illegal
    256 		 * instruction to halt it in its tracks.
    257 		 */
    258 #ifdef DEBUG
    259 		mutex_exit(p->p_lock);
    260 		if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid)
    261 			printf("sunos32_sendsig: window save or copyout error\n");
    262 		printf("sunos32_sendsig: stack was trashed trying to send sig %d, sending SIGILL\n", sig);
    263 #ifdef DDB
    264 		if (sigdebug & SDB_DDB) Debugger();
    265 #endif
    266 		mutex_enter(p->p_lock);
    267 #endif
    268 		sigexit(l, SIGILL);
    269 		/* NOTREACHED */
    270 	}
    271 
    272 #ifdef DEBUG
    273 	if ((sigdebug & SDB_FOLLOW)) {
    274 		printf("sunos32_sendsig: %s[%d] sig %d scp %p\n",
    275 		       p->p_comm, p->p_pid, sig, &fp->sf_sc);
    276 	}
    277 #endif
    278 	/*
    279 	 * Arrange to continue execution at the code copied out in exec().
    280 	 * It needs the function to call in %g1, and a new stack pointer.
    281 	 */
    282 	addr = (uint32_t)(u_long)catcher;	/* user does his own trampolining */
    283 	tf->tf_pc = addr;
    284 	tf->tf_npc = addr + 4;
    285 	tf->tf_out[6] = (uint64_t)(u_int)(u_long)newsp;
    286 #ifdef DEBUG
    287 	if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) {
    288 		mutex_exit(p->p_lock);
    289 		printf("sunos32_sendsig: about to return to catcher %p thru %p\n",
    290 		       catcher, (void *)(u_long)addr);
    291 #ifdef DDB
    292 		if (sigdebug & SDB_DDB) Debugger();
    293 #endif
    294 		mutex_enter(p->p_lock);
    295 	}
    296 #endif
    297 }
    298 
    299 int
    300 sunos32_sys_sigreturn(struct lwp *l, const struct sunos32_sys_sigreturn_args *uap, register_t *retval)
    301 {
    302 	/* {
    303 		syscallarg(netbsd32_sigcontextp_t) sigcntxp;
    304 	} */
    305 	struct proc *p = l->l_proc;
    306 	struct sunos32_sigcontext sc, *scp;
    307 	sigset_t mask;
    308 	struct trapframe64 *tf;
    309 
    310 	/* First ensure consistent stack state (see sendsig). */
    311 	write_user_windows();
    312 	if (rwindow_save(l)) {
    313 		mutex_enter(p->p_lock);
    314 		sigexit(l, SIGILL);
    315 	}
    316 #ifdef DEBUG
    317 	if (sigdebug & SDB_FOLLOW) {
    318 		printf("sunos32_sigreturn: %s[%d], sigcntxp %p\n",
    319 		    p->p_comm, p->p_pid, (void *)(u_long)SCARG(uap, sigcntxp));
    320 #ifdef DDB
    321 		if (sigdebug & SDB_DDB) Debugger();
    322 #endif
    323 	}
    324 #endif
    325 
    326 	scp = (struct sunos32_sigcontext *)(u_long)SCARG(uap, sigcntxp);
    327 	if ((vaddr_t)scp & 3 || (copyin((void *)scp, &sc, sizeof sc) != 0))
    328 		return (EFAULT);
    329 	scp = &sc;
    330 
    331 	tf = l->l_md.md_tf;
    332 	/*
    333 	 * Only the icc bits in the psr are used, so it need not be
    334 	 * verified.  pc and npc must be multiples of 4.  This is all
    335 	 * that is required; if it holds, just do it.
    336 	 */
    337 	if (((scp->sc_pc | scp->sc_npc) & 3) != 0 || scp->sc_pc == 0 || scp->sc_npc == 0)
    338 	{
    339 #ifdef DEBUG
    340 		printf("sunos32_sigreturn: pc %x or npc %x invalid\n", scp->sc_pc, scp->sc_npc);
    341 #ifdef DDB
    342 		Debugger();
    343 #endif
    344 #endif
    345 		return (EINVAL);
    346 	}
    347 	/* take only psr ICC field */
    348 	tf->tf_tstate = (int64_t)(tf->tf_tstate & ~TSTATE_CCR) | PSRCC_TO_TSTATE(scp->sc_psr);
    349 	tf->tf_pc = scp->sc_pc;
    350 	tf->tf_npc = scp->sc_npc;
    351 	tf->tf_global[1] = scp->sc_g1;
    352 	tf->tf_out[0] = scp->sc_o0;
    353 	tf->tf_out[6] = scp->sc_sp;
    354 #ifdef DEBUG
    355 	if (sigdebug & SDB_FOLLOW) {
    356 		printf("sunos32_sigreturn: return trapframe pc=%p sp=%p tstate=%llx\n",
    357 		       (void *)(u_long)tf->tf_pc, (void *)(u_long)tf->tf_out[6], (unsigned long long)tf->tf_tstate);
    358 #ifdef DDB
    359 		if (sigdebug & SDB_DDB) Debugger();
    360 #endif
    361 	}
    362 #endif
    363 
    364 	mutex_enter(p->p_lock);
    365 	if (scp->sc_onstack & SS_ONSTACK)
    366 		l->l_sigstk.ss_flags |= SS_ONSTACK;
    367 	else
    368 		l->l_sigstk.ss_flags &= ~SS_ONSTACK;
    369 	/* Restore signal mask */
    370 	native_sigset13_to_sigset(&scp->sc_mask, &mask);
    371 	(void) sigprocmask1(l, SIG_SETMASK, &mask, 0);
    372 	mutex_exit(p->p_lock);
    373 
    374 	return (EJUSTRETURN);
    375 }
    376 
    377 #if NFIRM_EVENTS > 0
    378 /*
    379  * Write out a series of 32-bit firm_events.
    380  */
    381 static int
    382 ev_out32(struct firm_event *e, int n, struct uio *uio)
    383 {
    384 	struct firm_event32 e32;
    385 	int error = 0;
    386 
    387 	while (n-- && error == 0) {
    388 		e32.id = e->id;
    389 		e32.value = e->value;
    390 		e32.time.tv_sec = e->time.tv_sec;
    391 		e32.time.tv_usec = e->time.tv_usec;
    392 		error = uiomove((void *)&e32, sizeof(e32), uio);
    393 		e++;
    394 	}
    395 	return (error);
    396 }
    397 #endif
    398