[apple/xnu.git] / bsd / dev / ppc / unix_signal.c

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * The contents of this file constitute Original Code as defined in and
 * are subject to the Apple Public Source License Version 1.1 (the
 * "License").  You may not use this file except in compliance with the
 * License.  Please obtain a copy of the License at
 * http://www.apple.com/publicsource and read it before using this file.
 * 
 * This Original Code and all software distributed under the License are
 * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
 * License for the specific language governing rights and limitations
 * under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/* 
 * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
 */

#include <mach/mach_types.h>
#include <mach/exception_types.h>

#include <sys/param.h>
#include <sys/proc.h>
#include <sys/user.h>
#include <sys/ucontext.h>

#include <ppc/signal.h>
#include <sys/signalvar.h>
#include <sys/kdebug.h>
#include <sys/wait.h>
#include <kern/thread.h>
#include <kern/thread_act.h>
#include <mach/ppc/thread_status.h>
#define __ELF__ 0
#include <ppc/proc_reg.h>

#define	C_REDZONE_LEN		224
#define	C_STK_ALIGN			16
#define C_PARAMSAVE_LEN		64
#define	C_LINKAGE_LEN		48
#define TRUNC_DOWN(a,b,c)  (((((unsigned)a)-(b))/(c)) * (c))

/*
 * Arrange for this process to run a signal handler
 */

void
sendsig(p, catcher, sig, mask, code)
 	struct proc *p;
	sig_t catcher;
	int sig, mask;
	u_long code;
{
	struct mcontext mctx, *p_mctx;
	struct ucontext uctx, *p_uctx;
	siginfo_t sinfo, *p_sinfo;
	struct sigacts *ps = p->p_sigacts;
	int framesize;
	int oonstack;
	unsigned long sp;
	unsigned long state_count;
	thread_act_t th_act;
	struct uthread *ut;
	unsigned long paramp,linkp;
	int infostyle = 1;
	sig_t trampact;
	int vec_used = 0;
	int stack_size = 0;
	int stack_flags = 0;

	th_act = current_act();
	ut = get_bsdthread_info(th_act);

	state_count = PPC_EXCEPTION_STATE_COUNT;
	if (act_machine_get_state(th_act, PPC_EXCEPTION_STATE, &mctx.es, &state_count)  != KERN_SUCCESS) {
		goto bad;
	}	
	state_count = PPC_THREAD_STATE_COUNT;
	if (act_machine_get_state(th_act, PPC_THREAD_STATE, &mctx.ss, &state_count)  != KERN_SUCCESS) {
		goto bad;
	}	
	state_count = PPC_FLOAT_STATE_COUNT;
	if (act_machine_get_state(th_act, PPC_FLOAT_STATE, &mctx.fs, &state_count)  != KERN_SUCCESS) {
		goto bad;
	}	

	vec_save(th_act);
	if (find_user_vec(th_act)) {
		vec_used = 1;
		state_count = PPC_VECTOR_STATE_COUNT;
		if (act_machine_get_state(th_act, PPC_VECTOR_STATE, &mctx.vs, &state_count)  != KERN_SUCCESS) {
			goto bad;
		}	
		
	}

	trampact = ps->ps_trampact[sig];
	oonstack = ps->ps_sigstk.ss_flags & SA_ONSTACK;
	if (p->p_sigacts->ps_siginfo & sigmask(sig))
		infostyle = 2;

	/* figure out where our new stack lives */
	if ((ps->ps_flags & SAS_ALTSTACK) && !oonstack &&
		(ps->ps_sigonstack & sigmask(sig))) {
		sp = (unsigned long)(ps->ps_sigstk.ss_sp);
		sp += ps->ps_sigstk.ss_size;
		stack_size = ps->ps_sigstk.ss_size;
		ps->ps_sigstk.ss_flags |= SA_ONSTACK;
	}
	else
		sp = mctx.ss.r1;

	/* preserve RED ZONE area */
	sp = TRUNC_DOWN(sp, C_REDZONE_LEN, C_STK_ALIGN);

	/* context goes first on stack */
	sp -= sizeof(*p_uctx);
	p_uctx = (struct ucontext *) sp;

	/* this is where siginfo goes on stack */
	sp -= sizeof(*p_sinfo);
	p_sinfo = (siginfo_t *) sp;

	/* next are the saved registers */
	sp -= sizeof(*p_mctx);
	p_mctx = (struct mcontext *)sp;

	/* C calling conventions, create param save and linkage
	 *  areas
	 */

	sp = TRUNC_DOWN(sp, C_PARAMSAVE_LEN, C_STK_ALIGN);
	paramp = sp;
	sp -= C_LINKAGE_LEN;
	linkp = sp;

	uctx.uc_onstack = oonstack;
	uctx.uc_sigmask = mask;
	uctx.uc_stack.ss_sp = (char *)sp;
	uctx.uc_stack.ss_size = stack_size;
	if (oonstack)
		uctx.uc_stack.ss_flags |= SS_ONSTACK;
		
	uctx.uc_link = 0;
	uctx.uc_mcsize = (size_t)((PPC_EXCEPTION_STATE_COUNT + PPC_THREAD_STATE_COUNT + PPC_FLOAT_STATE_COUNT) * sizeof(int));
	if (vec_used) 
		uctx.uc_mcsize += (size_t)(PPC_VECTOR_STATE_COUNT * sizeof(int));
	uctx.uc_mcontext = p_mctx;

	/* setup siginfo */
	bzero((caddr_t)&sinfo, sizeof(siginfo_t));
	sinfo.si_signo = sig;
	switch (sig) {
		case SIGCHLD:
			sinfo.si_pid = p->si_pid;
			p->si_pid =0;
			sinfo.si_status = p->si_status;
			p->si_status = 0;
			sinfo.si_uid = p->si_uid;
			p->si_uid =0;
			sinfo.si_code = p->si_code;
			p->si_code = 0;
			if (sinfo.si_code == CLD_EXITED) {
				if (WIFEXITED(sinfo.si_status)) 
					sinfo.si_code = CLD_EXITED;
				else if (WIFSIGNALED(sinfo.si_status)) {
					if (WCOREDUMP(sinfo.si_status))
						sinfo.si_code = CLD_DUMPED;
					else	
						sinfo.si_code = CLD_KILLED;
				}
			}
			break;
		case SIGILL:
			sinfo.si_addr = (void *)mctx.ss.srr0;
			if (mctx.ss.srr1 & (1 << (31 - SRR1_PRG_ILL_INS_BIT)))
				sinfo.si_code = ILL_ILLOPC;
			else if (mctx.ss.srr1 & (1 << (31 - SRR1_PRG_PRV_INS_BIT)))
				sinfo.si_code = ILL_PRVOPC;
			else if (mctx.ss.srr1 & (1 << (31 - SRR1_PRG_TRAP_BIT)))
				sinfo.si_code = ILL_ILLTRP;
			else
				sinfo.si_code = ILL_NOOP;
			break;
		case SIGFPE:
#define FPSCR_VX	2
#define FPSCR_OX	3
#define FPSCR_UX	4
#define FPSCR_ZX	5
#define FPSCR_XX	6
			sinfo.si_addr = (void *)mctx.ss.srr0;
			if (mctx.fs.fpscr & (1 << (31 - FPSCR_VX)))
				sinfo.si_code = FPE_FLTINV;
			else if (mctx.fs.fpscr & (1 << (31 - FPSCR_OX)))
				sinfo.si_code = FPE_FLTOVF;
			else if (mctx.fs.fpscr & (1 << (31 - FPSCR_UX)))
				sinfo.si_code = FPE_FLTUND;
			else if (mctx.fs.fpscr & (1 << (31 - FPSCR_ZX)))
				sinfo.si_code = FPE_FLTDIV;
			else if (mctx.fs.fpscr & (1 << (31 - FPSCR_XX)))
				sinfo.si_code = FPE_FLTRES;
			else
				sinfo.si_code = FPE_NOOP;
			break;

		case SIGBUS:
			sinfo.si_addr = (void *)mctx.ss.srr0;
			/* on ppc we generate only if EXC_PPC_UNALIGNED */
			sinfo.si_code = BUS_ADRALN;
			break;

		case SIGSEGV:
			sinfo.si_addr = (void *)mctx.ss.srr0;
			/* First check in srr1 and then in dsisr */
			if (mctx.ss.srr1 & (1 << (31 - DSISR_PROT_BIT)))
				sinfo.si_code = SEGV_ACCERR;
			else if (mctx.es.dsisr & (1 << (31 - DSISR_PROT_BIT)))
				sinfo.si_code = SEGV_ACCERR;
			else
				sinfo.si_code = SEGV_MAPERR;
			break;
		default:
			break;
	}

	/* copy info out to user space */
	if (copyout((caddr_t)&uctx, (caddr_t)p_uctx, sizeof(struct ucontext)))
		goto bad;
	if (copyout((caddr_t)&sinfo, (caddr_t)p_sinfo, sizeof(siginfo_t)))
		goto bad;
	if (copyout((caddr_t)&mctx, (caddr_t)p_mctx, uctx.uc_mcsize))
		goto bad;

	/* Place our arguments in arg registers: rtm dependent */

	mctx.ss.r3 = (unsigned long)catcher;
	mctx.ss.r4 = (unsigned long)infostyle;
	mctx.ss.r5 = (unsigned long)sig;
	mctx.ss.r6 = (unsigned long)p_sinfo;
	mctx.ss.r7 = (unsigned long)p_uctx;

	mctx.ss.srr0 = (unsigned long)trampact;
	mctx.ss.srr1 = get_msr_exportmask();	/* MSR_EXPORT_MASK_SET */
	mctx.ss.r1 = sp;
	state_count = PPC_THREAD_STATE_COUNT;
	if (act_machine_set_state(th_act, PPC_THREAD_STATE, &mctx.ss, &state_count)  != KERN_SUCCESS) {
		goto bad;
	}	

	return;

bad:
	SIGACTION(p, SIGILL) = SIG_DFL;
	sig = sigmask(SIGILL);
	p->p_sigignore &= ~sig;
	p->p_sigcatch &= ~sig;
	ut->uu_sigmask &= ~sig;
	/* sendsig is called with signal lock held */
	psignal_lock(p, SIGILL, 0);
	return;
}

/*
 * 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
 * psl to gain improper priviledges or to cause
 * a machine fault.
 */
struct sigreturn_args {
	struct ucontext *uctx;
};

/* ARGSUSED */
int
sigreturn(p, uap, retval)
	struct proc *p;
	struct sigreturn_args *uap;
	int *retval;
{
	struct ucontext uctx, *p_uctx;
	struct mcontext mctx, *p_mctx;
	int error;
	thread_act_t th_act;
	struct ppc_float_state fs;
	struct ppc_exception_state es;
	struct sigacts *ps = p->p_sigacts;
	sigset_t mask;	
	register sig_t action;
	unsigned long state_count;
	unsigned int nbits, rbits;
	struct uthread * ut;
	int vec_used = 0;

	th_act = current_act();

	ut = (struct uthread *)get_bsdthread_info(th_act);
	if (error = copyin(uap->uctx, &uctx, sizeof(struct ucontext))) {
		return(error);
	}
	if (error = copyin(uctx.uc_mcontext, &mctx, sizeof(struct mcontext))) {
		return(error);
	}
	
	if (uctx.uc_onstack & 01)
			p->p_sigacts->ps_sigstk.ss_flags |= SA_ONSTACK;
	else
		p->p_sigacts->ps_sigstk.ss_flags &= ~SA_ONSTACK;
	ut->uu_sigmask = uctx.uc_sigmask & ~sigcantmask;


	if (ut->uu_siglist & ~ut->uu_sigmask)
		signal_setast(current_act());	

	nbits = get_msr_nbits();
	rbits = get_msr_rbits();
	/* adjust the critical fields */
	/* make sure naughty bits are off */
	mctx.ss.srr1 &= ~(nbits);
	/* make sure necessary bits are on */
	mctx.ss.srr1 |= (rbits);

	state_count = (size_t)((PPC_EXCEPTION_STATE_COUNT + PPC_THREAD_STATE_COUNT + PPC_FLOAT_STATE_COUNT) * sizeof(int));

	if (uctx.uc_mcsize > state_count)
		vec_used = 1;

	state_count = PPC_THREAD_STATE_COUNT;
	if (act_machine_set_state(th_act, PPC_THREAD_STATE, &mctx.ss, &state_count)  != KERN_SUCCESS) {
		return(EINVAL);
	}	

	state_count = PPC_FLOAT_STATE_COUNT;
	if (act_machine_set_state(th_act, PPC_FLOAT_STATE, &mctx.fs, &state_count)  != KERN_SUCCESS) {
		return(EINVAL);
	}	

	mask = sigmask(SIGFPE);
	if (((ut->uu_sigmask & mask) == 0) && (p->p_sigcatch & mask) && ((p->p_sigignore & mask) == 0)) {
		action = ps->ps_sigact[SIGFPE];
		if((action != SIG_DFL) && (action != SIG_IGN)) {
			thread_enable_fpe(th_act, 1);
		}
	}

	if (vec_used) {
		state_count = PPC_VECTOR_STATE_COUNT;
		if (act_machine_set_state(th_act, PPC_VECTOR_STATE, &mctx.vs, &state_count)  != KERN_SUCCESS) {
			return(EINVAL);
		}	
	}

	return (EJUSTRETURN);
}

/*
 * machine_exception() performs MD translation
 * of a mach exception to a unix signal and code.
 */

boolean_t
machine_exception(
    int		exception,
    int		code,
    int		subcode,
    int		*unix_signal,
    int		*unix_code
)
{
    switch(exception) {

    case EXC_BAD_INSTRUCTION:
	*unix_signal = SIGILL;
	*unix_code = code;
	break;

    case EXC_ARITHMETIC:
	*unix_signal = SIGFPE;
	*unix_code = code;
	break;

    case EXC_SOFTWARE:
	if (code == EXC_PPC_TRAP) {
		*unix_signal = SIGTRAP;
		*unix_code = code;
		break;
	} else
		return(FALSE);

    default:
	return(FALSE);
    }
   
    return(TRUE);
}
Commit	Line	Data
1c79356b A	1	/*
	2	* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
de355530 A	6	* The contents of this file constitute Original Code as defined in and
	7	* are subject to the Apple Public Source License Version 1.1 (the
	8	* "License"). You may not use this file except in compliance with the
	9	* License. Please obtain a copy of the License at
	10	* http://www.apple.com/publicsource and read it before using this file.
1c79356b	11	*
de355530 A	12	* This Original Code and all software distributed under the License are
de355530 A	13	* distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
1c79356b A	14	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
1c79356b A	15	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
de355530 A	16	* FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
	17	* License for the specific language governing rights and limitations
	18	* under the License.
1c79356b A	19	*
	20	* @APPLE_LICENSE_HEADER_END@
	21	*/
	22	/*
	23	* Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
	24	*/
	25
	26	#include <mach/mach_types.h>
	27	#include <mach/exception_types.h>
	28
	29	#include <sys/param.h>
	30	#include <sys/proc.h>
	31	#include <sys/user.h>
9bccf70c	32	#include <sys/ucontext.h>
1c79356b A	33
	34	#include <ppc/signal.h>
	35	#include <sys/signalvar.h>
9bccf70c A	36	#include <sys/kdebug.h>
9bccf70c A	37	#include <sys/wait.h>
1c79356b A	38	#include <kern/thread.h>
	39	#include <kern/thread_act.h>
	40	#include <mach/ppc/thread_status.h>
de355530	41	#define __ELF__ 0
9bccf70c	42	#include <ppc/proc_reg.h>
1c79356b A	43
	44	#define C_REDZONE_LEN 224
	45	#define C_STK_ALIGN 16
	46	#define C_PARAMSAVE_LEN 64
	47	#define C_LINKAGE_LEN 48
	48	#define TRUNC_DOWN(a,b,c) (((((unsigned)a)-(b))/(c)) * (c))
	49
	50	/*
	51	* Arrange for this process to run a signal handler
	52	*/
	53
1c79356b A	54	void
	55	sendsig(p, catcher, sig, mask, code)
	56	struct proc *p;
	57	sig_t catcher;
	58	int sig, mask;
	59	u_long code;
	60	{
9bccf70c A	61	struct mcontext mctx, *p_mctx;
	62	struct ucontext uctx, *p_uctx;
	63	siginfo_t sinfo, *p_sinfo;
1c79356b A	64	struct sigacts *ps = p->p_sigacts;
	65	int framesize;
	66	int oonstack;
	67	unsigned long sp;
1c79356b	68	unsigned long state_count;
1c79356b	69	thread_act_t th_act;
9bccf70c	70	struct uthread *ut;
1c79356b	71	unsigned long paramp,linkp;
de355530	72	int infostyle = 1;
9bccf70c A	73	sig_t trampact;
	74	int vec_used = 0;
	75	int stack_size = 0;
	76	int stack_flags = 0;
1c79356b	77
1c79356b	78	th_act = current_act();
9bccf70c	79	ut = get_bsdthread_info(th_act);
1c79356b	80
de355530 A	81	state_count = PPC_EXCEPTION_STATE_COUNT;
	82	if (act_machine_get_state(th_act, PPC_EXCEPTION_STATE, &mctx.es, &state_count) != KERN_SUCCESS) {
	83	goto bad;
	84	}
1c79356b	85	state_count = PPC_THREAD_STATE_COUNT;
de355530	86	if (act_machine_get_state(th_act, PPC_THREAD_STATE, &mctx.ss, &state_count) != KERN_SUCCESS) {
1c79356b	87	goto bad;
de355530 A	88	}
	89	state_count = PPC_FLOAT_STATE_COUNT;
	90	if (act_machine_get_state(th_act, PPC_FLOAT_STATE, &mctx.fs, &state_count) != KERN_SUCCESS) {
	91	goto bad;
	92	}
1c79356b	93
9bccf70c A	94	vec_save(th_act);
	95	if (find_user_vec(th_act)) {
	96	vec_used = 1;
de355530 A	97	state_count = PPC_VECTOR_STATE_COUNT;
	98	if (act_machine_get_state(th_act, PPC_VECTOR_STATE, &mctx.vs, &state_count) != KERN_SUCCESS) {
	99	goto bad;
	100	}
	101
	102	}
9bccf70c A	103
9bccf70c A	104	trampact = ps->ps_trampact[sig];
1c79356b	105	oonstack = ps->ps_sigstk.ss_flags & SA_ONSTACK;
de355530 A	106	if (p->p_sigacts->ps_siginfo & sigmask(sig))
de355530 A	107	infostyle = 2;
1c79356b A	108
	109	/* figure out where our new stack lives */
	110	if ((ps->ps_flags & SAS_ALTSTACK) && !oonstack &&
	111	(ps->ps_sigonstack & sigmask(sig))) {
	112	sp = (unsigned long)(ps->ps_sigstk.ss_sp);
	113	sp += ps->ps_sigstk.ss_size;
9bccf70c	114	stack_size = ps->ps_sigstk.ss_size;
1c79356b A	115	ps->ps_sigstk.ss_flags \|= SA_ONSTACK;
1c79356b A	116	}
de355530 A	117	else
de355530 A	118	sp = mctx.ss.r1;
1c79356b	119
9bccf70c	120	/* preserve RED ZONE area */
1c79356b A	121	sp = TRUNC_DOWN(sp, C_REDZONE_LEN, C_STK_ALIGN);
1c79356b A	122
de355530	123	/* context goes first on stack */
9bccf70c A	124	sp -= sizeof(*p_uctx);
	125	p_uctx = (struct ucontext *) sp;
	126
	127	/* this is where siginfo goes on stack */
	128	sp -= sizeof(*p_sinfo);
	129	p_sinfo = (siginfo_t *) sp;
1c79356b	130
de355530 A	131	/* next are the saved registers */
	132	sp -= sizeof(*p_mctx);
	133	p_mctx = (struct mcontext *)sp;
	134
9bccf70c	135	/* C calling conventions, create param save and linkage
de355530 A	136	* areas
de355530 A	137	*/
1c79356b A	138
	139	sp = TRUNC_DOWN(sp, C_PARAMSAVE_LEN, C_STK_ALIGN);
	140	paramp = sp;
	141	sp -= C_LINKAGE_LEN;
	142	linkp = sp;
	143
9bccf70c A	144	uctx.uc_onstack = oonstack;
	145	uctx.uc_sigmask = mask;
	146	uctx.uc_stack.ss_sp = (char *)sp;
	147	uctx.uc_stack.ss_size = stack_size;
	148	if (oonstack)
	149	uctx.uc_stack.ss_flags \|= SS_ONSTACK;
	150
	151	uctx.uc_link = 0;
de355530	152	uctx.uc_mcsize = (size_t)((PPC_EXCEPTION_STATE_COUNT + PPC_THREAD_STATE_COUNT + PPC_FLOAT_STATE_COUNT) * sizeof(int));
9bccf70c A	153	if (vec_used)
9bccf70c A	154	uctx.uc_mcsize += (size_t)(PPC_VECTOR_STATE_COUNT * sizeof(int));
de355530	155	uctx.uc_mcontext = p_mctx;
9bccf70c A	156
	157	/* setup siginfo */
	158	bzero((caddr_t)&sinfo, sizeof(siginfo_t));
	159	sinfo.si_signo = sig;
	160	switch (sig) {
	161	case SIGCHLD:
	162	sinfo.si_pid = p->si_pid;
	163	p->si_pid =0;
	164	sinfo.si_status = p->si_status;
	165	p->si_status = 0;
	166	sinfo.si_uid = p->si_uid;
	167	p->si_uid =0;
	168	sinfo.si_code = p->si_code;
	169	p->si_code = 0;
	170	if (sinfo.si_code == CLD_EXITED) {
	171	if (WIFEXITED(sinfo.si_status))
	172	sinfo.si_code = CLD_EXITED;
	173	else if (WIFSIGNALED(sinfo.si_status)) {
	174	if (WCOREDUMP(sinfo.si_status))
	175	sinfo.si_code = CLD_DUMPED;
	176	else
	177	sinfo.si_code = CLD_KILLED;
	178	}
	179	}
	180	break;
	181	case SIGILL:
	182	sinfo.si_addr = (void *)mctx.ss.srr0;
	183	if (mctx.ss.srr1 & (1 << (31 - SRR1_PRG_ILL_INS_BIT)))
	184	sinfo.si_code = ILL_ILLOPC;
	185	else if (mctx.ss.srr1 & (1 << (31 - SRR1_PRG_PRV_INS_BIT)))
	186	sinfo.si_code = ILL_PRVOPC;
	187	else if (mctx.ss.srr1 & (1 << (31 - SRR1_PRG_TRAP_BIT)))
	188	sinfo.si_code = ILL_ILLTRP;
	189	else
	190	sinfo.si_code = ILL_NOOP;
	191	break;
	192	case SIGFPE:
	193	#define FPSCR_VX 2
	194	#define FPSCR_OX 3
	195	#define FPSCR_UX 4
	196	#define FPSCR_ZX 5
	197	#define FPSCR_XX 6
	198	sinfo.si_addr = (void *)mctx.ss.srr0;
	199	if (mctx.fs.fpscr & (1 << (31 - FPSCR_VX)))
	200	sinfo.si_code = FPE_FLTINV;
	201	else if (mctx.fs.fpscr & (1 << (31 - FPSCR_OX)))
	202	sinfo.si_code = FPE_FLTOVF;
	203	else if (mctx.fs.fpscr & (1 << (31 - FPSCR_UX)))
	204	sinfo.si_code = FPE_FLTUND;
	205	else if (mctx.fs.fpscr & (1 << (31 - FPSCR_ZX)))
	206	sinfo.si_code = FPE_FLTDIV;
	207	else if (mctx.fs.fpscr & (1 << (31 - FPSCR_XX)))
	208	sinfo.si_code = FPE_FLTRES;
	209	else
	210	sinfo.si_code = FPE_NOOP;
	211	break;
	212
	213	case SIGBUS:
	214	sinfo.si_addr = (void *)mctx.ss.srr0;
	215	/* on ppc we generate only if EXC_PPC_UNALIGNED */
	216	sinfo.si_code = BUS_ADRALN;
	217	break;
	218
	219	case SIGSEGV:
220	sinfo.si_addr = (void *)mctx.ss.srr0;
221	/* First check in srr1 and then in dsisr */
222	if (mctx.ss.srr1 & (1 << (31 - DSISR_PROT_BIT)))
223	sinfo.si_code = SEGV_ACCERR;
224	else if (mctx.es.dsisr & (1 << (31 - DSISR_PROT_BIT)))
225	sinfo.si_code = SEGV_ACCERR;
226	else
227	sinfo.si_code = SEGV_MAPERR;
228	break;
229	default:
230	break;
231	}
1c79356b A	232
1c79356b A	233	/* copy info out to user space */
9bccf70c	234	if (copyout((caddr_t)&uctx, (caddr_t)p_uctx, sizeof(struct ucontext)))
1c79356b	235	goto bad;
9bccf70c	236	if (copyout((caddr_t)&sinfo, (caddr_t)p_sinfo, sizeof(siginfo_t)))
1c79356b	237	goto bad;
de355530	238	if (copyout((caddr_t)&mctx, (caddr_t)p_mctx, uctx.uc_mcsize))
1c79356b A	239	goto bad;
	240
	241	/* Place our arguments in arg registers: rtm dependent */
	242
9bccf70c A	243	mctx.ss.r3 = (unsigned long)catcher;
	244	mctx.ss.r4 = (unsigned long)infostyle;
	245	mctx.ss.r5 = (unsigned long)sig;
	246	mctx.ss.r6 = (unsigned long)p_sinfo;
	247	mctx.ss.r7 = (unsigned long)p_uctx;
1c79356b	248
9bccf70c A	249	mctx.ss.srr0 = (unsigned long)trampact;
	250	mctx.ss.srr1 = get_msr_exportmask(); /* MSR_EXPORT_MASK_SET */
	251	mctx.ss.r1 = sp;
1c79356b	252	state_count = PPC_THREAD_STATE_COUNT;
de355530	253	if (act_machine_set_state(th_act, PPC_THREAD_STATE, &mctx.ss, &state_count) != KERN_SUCCESS) {
1c79356b A	254	goto bad;
1c79356b A	255	}
de355530	256
1c79356b A	257	return;
	258
	259	bad:
	260	SIGACTION(p, SIGILL) = SIG_DFL;
	261	sig = sigmask(SIGILL);
	262	p->p_sigignore &= ~sig;
	263	p->p_sigcatch &= ~sig;
9bccf70c	264	ut->uu_sigmask &= ~sig;
1c79356b	265	/* sendsig is called with signal lock held */
9bccf70c	266	psignal_lock(p, SIGILL, 0);
1c79356b A	267	return;
	268	}
	269
	270	/*
	271	* System call to cleanup state after a signal
	272	* has been taken. Reset signal mask and
	273	* stack state from context left by sendsig (above).
	274	* Return to previous pc and psl as specified by
	275	* context left by sendsig. Check carefully to
	276	* make sure that the user has not modified the
	277	* psl to gain improper priviledges or to cause
	278	* a machine fault.
	279	*/
	280	struct sigreturn_args {
9bccf70c	281	struct ucontext *uctx;
1c79356b A	282	};
	283
	284	/* ARGSUSED */
	285	int
	286	sigreturn(p, uap, retval)
	287	struct proc *p;
	288	struct sigreturn_args *uap;
	289	int *retval;
	290	{
de355530 A	291	struct ucontext uctx, *p_uctx;
de355530 A	292	struct mcontext mctx, *p_mctx;
1c79356b	293	int error;
1c79356b	294	thread_act_t th_act;
de355530 A	295	struct ppc_float_state fs;
de355530 A	296	struct ppc_exception_state es;
9bccf70c A	297	struct sigacts *ps = p->p_sigacts;
	298	sigset_t mask;
	299	register sig_t action;
1c79356b	300	unsigned long state_count;
de355530	301	unsigned int nbits, rbits;
9bccf70c A	302	struct uthread * ut;
9bccf70c A	303	int vec_used = 0;
1c79356b	304
1c79356b A	305	th_act = current_act();
1c79356b A	306
9bccf70c A	307	ut = (struct uthread *)get_bsdthread_info(th_act);
9bccf70c A	308	if (error = copyin(uap->uctx, &uctx, sizeof(struct ucontext))) {
1c79356b A	309	return(error);
1c79356b A	310	}
de355530	311	if (error = copyin(uctx.uc_mcontext, &mctx, sizeof(struct mcontext))) {
9bccf70c A	312	return(error);
	313	}
	314
	315	if (uctx.uc_onstack & 01)
	316	p->p_sigacts->ps_sigstk.ss_flags \|= SA_ONSTACK;
	317	else
	318	p->p_sigacts->ps_sigstk.ss_flags &= ~SA_ONSTACK;
d7e50217	319	ut->uu_sigmask = uctx.uc_sigmask & ~sigcantmask;
de355530 A	320
de355530 A	321
9bccf70c A	322	if (ut->uu_siglist & ~ut->uu_sigmask)
	323	signal_setast(current_act());
	324
de355530 A	325	nbits = get_msr_nbits();
	326	rbits = get_msr_rbits();
	327	/* adjust the critical fields */
	328	/* make sure naughty bits are off */
	329	mctx.ss.srr1 &= ~(nbits);
	330	/* make sure necessary bits are on */
	331	mctx.ss.srr1 \|= (rbits);
1c79356b	332
de355530	333	state_count = (size_t)((PPC_EXCEPTION_STATE_COUNT + PPC_THREAD_STATE_COUNT + PPC_FLOAT_STATE_COUNT) * sizeof(int));
1c79356b	334
de355530 A	335	if (uctx.uc_mcsize > state_count)
	336	vec_used = 1;
	337
	338	state_count = PPC_THREAD_STATE_COUNT;
	339	if (act_machine_set_state(th_act, PPC_THREAD_STATE, &mctx.ss, &state_count) != KERN_SUCCESS) {
1c79356b A	340	return(EINVAL);
	341	}
	342
	343	state_count = PPC_FLOAT_STATE_COUNT;
de355530	344	if (act_machine_set_state(th_act, PPC_FLOAT_STATE, &mctx.fs, &state_count) != KERN_SUCCESS) {
1c79356b A	345	return(EINVAL);
1c79356b A	346	}
9bccf70c A	347
	348	mask = sigmask(SIGFPE);
	349	if (((ut->uu_sigmask & mask) == 0) && (p->p_sigcatch & mask) && ((p->p_sigignore & mask) == 0)) {
	350	action = ps->ps_sigact[SIGFPE];
	351	if((action != SIG_DFL) && (action != SIG_IGN)) {
	352	thread_enable_fpe(th_act, 1);
	353	}
	354	}
	355
	356	if (vec_used) {
	357	state_count = PPC_VECTOR_STATE_COUNT;
de355530	358	if (act_machine_set_state(th_act, PPC_VECTOR_STATE, &mctx.vs, &state_count) != KERN_SUCCESS) {
9bccf70c A	359	return(EINVAL);
	360	}
	361	}
de355530	362
1c79356b A	363	return (EJUSTRETURN);
	364	}
	365
	366	/*
	367	* machine_exception() performs MD translation
	368	* of a mach exception to a unix signal and code.
	369	*/
	370
	371	boolean_t
	372	machine_exception(
	373	int exception,
	374	int code,
	375	int subcode,
	376	int *unix_signal,
	377	int *unix_code
	378	)
	379	{
	380	switch(exception) {
	381
	382	case EXC_BAD_INSTRUCTION:
	383	*unix_signal = SIGILL;
	384	*unix_code = code;
	385	break;
	386
	387	case EXC_ARITHMETIC:
	388	*unix_signal = SIGFPE;
	389	*unix_code = code;
	390	break;
	391
	392	case EXC_SOFTWARE:
	393	if (code == EXC_PPC_TRAP) {
	394	*unix_signal = SIGTRAP;
	395	*unix_code = code;
	396	break;
	397	} else
	398	return(FALSE);
	399
	400	default:
	401	return(FALSE);
	402	}
	403
	404	return(TRUE);
	405	}
	406