[qemu.git] / linux-user / sh4 / signal.c

/*
 *  Emulation of Linux signals
 *
 *  Copyright (c) 2003 Fabrice Bellard
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, see <http://www.gnu.org/licenses/>.
 */
#include "qemu/osdep.h"
#include "qemu.h"
#include "signal-common.h"
#include "linux-user/trace.h"

/*
 * code and data structures from linux kernel:
 * include/asm-sh/sigcontext.h
 * arch/sh/kernel/signal.c
 */

struct target_sigcontext {
    target_ulong  oldmask;

    /* CPU registers */
    target_ulong  sc_gregs[16];
    target_ulong  sc_pc;
    target_ulong  sc_pr;
    target_ulong  sc_sr;
    target_ulong  sc_gbr;
    target_ulong  sc_mach;
    target_ulong  sc_macl;

    /* FPU registers */
    target_ulong  sc_fpregs[16];
    target_ulong  sc_xfpregs[16];
    unsigned int sc_fpscr;
    unsigned int sc_fpul;
    unsigned int sc_ownedfp;
};

struct target_sigframe
{
    struct target_sigcontext sc;
    target_ulong extramask[TARGET_NSIG_WORDS-1];
    uint16_t retcode[3];
};


struct target_ucontext {
    target_ulong tuc_flags;
    struct target_ucontext *tuc_link;
    target_stack_t tuc_stack;
    struct target_sigcontext tuc_mcontext;
    target_sigset_t tuc_sigmask;        /* mask last for extensibility */
};

struct target_rt_sigframe
{
    struct target_siginfo info;
    struct target_ucontext uc;
    uint16_t retcode[3];
};


#define MOVW(n)  (0x9300|((n)-2)) /* Move mem word at PC+n to R3 */
#define TRAP_NOARG 0xc310         /* Syscall w/no args (NR in R3) SH3/4 */

static abi_ulong get_sigframe(struct target_sigaction *ka,
                              unsigned long sp, size_t frame_size)
{
    sp = target_sigsp(sp, ka);

    return (sp - frame_size) & -8ul;
}

/*
 * Notice when we're in the middle of a gUSA region and reset.
 * Note that this will only occur when #CF_PARALLEL is unset, as we
 * will translate such sequences differently in a parallel context.
 */
static void unwind_gusa(CPUSH4State *regs)
{
    /* If the stack pointer is sufficiently negative, and we haven't
       completed the sequence, then reset to the entry to the region.  */
    /* ??? The SH4 kernel checks for and address above 0xC0000000.
       However, the page mappings in qemu linux-user aren't as restricted
       and we wind up with the normal stack mapped above 0xF0000000.
       That said, there is no reason why the kernel should be allowing
       a gUSA region that spans 1GB.  Use a tighter check here, for what
       can actually be enabled by the immediate move.  */
    if (regs->gregs[15] >= -128u && regs->pc < regs->gregs[0]) {
        /* Reset the PC to before the gUSA region, as computed from
           R0 = region end, SP = -(region size), plus one more for the
           insn that actually initializes SP to the region size.  */
        regs->pc = regs->gregs[0] + regs->gregs[15] - 2;

        /* Reset the SP to the saved version in R1.  */
        regs->gregs[15] = regs->gregs[1];
    }
}

static void setup_sigcontext(struct target_sigcontext *sc,
                             CPUSH4State *regs, unsigned long mask)
{
    int i;

#define COPY(x)         __put_user(regs->x, &sc->sc_##x)
    COPY(gregs[0]); COPY(gregs[1]);
    COPY(gregs[2]); COPY(gregs[3]);
    COPY(gregs[4]); COPY(gregs[5]);
    COPY(gregs[6]); COPY(gregs[7]);
    COPY(gregs[8]); COPY(gregs[9]);
    COPY(gregs[10]); COPY(gregs[11]);
    COPY(gregs[12]); COPY(gregs[13]);
    COPY(gregs[14]); COPY(gregs[15]);
    COPY(gbr); COPY(mach);
    COPY(macl); COPY(pr);
    COPY(sr); COPY(pc);
#undef COPY

    for (i=0; i<16; i++) {
        __put_user(regs->fregs[i], &sc->sc_fpregs[i]);
    }
    __put_user(regs->fpscr, &sc->sc_fpscr);
    __put_user(regs->fpul, &sc->sc_fpul);

    /* non-iBCS2 extensions.. */
    __put_user(mask, &sc->oldmask);
}

static void restore_sigcontext(CPUSH4State *regs, struct target_sigcontext *sc)
{
    int i;

#define COPY(x)         __get_user(regs->x, &sc->sc_##x)
    COPY(gregs[0]); COPY(gregs[1]);
    COPY(gregs[2]); COPY(gregs[3]);
    COPY(gregs[4]); COPY(gregs[5]);
    COPY(gregs[6]); COPY(gregs[7]);
    COPY(gregs[8]); COPY(gregs[9]);
    COPY(gregs[10]); COPY(gregs[11]);
    COPY(gregs[12]); COPY(gregs[13]);
    COPY(gregs[14]); COPY(gregs[15]);
    COPY(gbr); COPY(mach);
    COPY(macl); COPY(pr);
    COPY(sr); COPY(pc);
#undef COPY

    for (i=0; i<16; i++) {
        __get_user(regs->fregs[i], &sc->sc_fpregs[i]);
    }
    __get_user(regs->fpscr, &sc->sc_fpscr);
    __get_user(regs->fpul, &sc->sc_fpul);

    regs->tra = -1;         /* disable syscall checks */
    regs->flags &= ~(DELAY_SLOT_MASK | GUSA_MASK);
}

void setup_frame(int sig, struct target_sigaction *ka,
                 target_sigset_t *set, CPUSH4State *regs)
{
    struct target_sigframe *frame;
    abi_ulong frame_addr;
    int i;

    unwind_gusa(regs);

    frame_addr = get_sigframe(ka, regs->gregs[15], sizeof(*frame));
    trace_user_setup_frame(regs, frame_addr);
    if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) {
        goto give_sigsegv;
    }

    setup_sigcontext(&frame->sc, regs, set->sig[0]);

    for (i = 0; i < TARGET_NSIG_WORDS - 1; i++) {
        __put_user(set->sig[i + 1], &frame->extramask[i]);
    }

    /* Set up to return from userspace.  If provided, use a stub
       already in userspace.  */
    if (ka->sa_flags & TARGET_SA_RESTORER) {
        regs->pr = (unsigned long) ka->sa_restorer;
    } else {
        /* Generate return code (system call to sigreturn) */
        abi_ulong retcode_addr = frame_addr +
                                 offsetof(struct target_sigframe, retcode);
        __put_user(MOVW(2), &frame->retcode[0]);
        __put_user(TRAP_NOARG, &frame->retcode[1]);
        __put_user((TARGET_NR_sigreturn), &frame->retcode[2]);
        regs->pr = (unsigned long) retcode_addr;
    }

    /* Set up registers for signal handler */
    regs->gregs[15] = frame_addr;
    regs->gregs[4] = sig; /* Arg for signal handler */
    regs->gregs[5] = 0;
    regs->gregs[6] = frame_addr += offsetof(typeof(*frame), sc);
    regs->pc = (unsigned long) ka->_sa_handler;
    regs->flags &= ~(DELAY_SLOT_MASK | GUSA_MASK);

    unlock_user_struct(frame, frame_addr, 1);
    return;

give_sigsegv:
    unlock_user_struct(frame, frame_addr, 1);
    force_sigsegv(sig);
}

void setup_rt_frame(int sig, struct target_sigaction *ka,
                    target_siginfo_t *info,
                    target_sigset_t *set, CPUSH4State *regs)
{
    struct target_rt_sigframe *frame;
    abi_ulong frame_addr;
    int i;

    unwind_gusa(regs);

    frame_addr = get_sigframe(ka, regs->gregs[15], sizeof(*frame));
    trace_user_setup_rt_frame(regs, frame_addr);
    if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) {
        goto give_sigsegv;
    }

    tswap_siginfo(&frame->info, info);

    /* Create the ucontext.  */
    __put_user(0, &frame->uc.tuc_flags);
    __put_user(0, (unsigned long *)&frame->uc.tuc_link);
    target_save_altstack(&frame->uc.tuc_stack, regs);
    setup_sigcontext(&frame->uc.tuc_mcontext,
                     regs, set->sig[0]);
    for(i = 0; i < TARGET_NSIG_WORDS; i++) {
        __put_user(set->sig[i], &frame->uc.tuc_sigmask.sig[i]);
    }

    /* Set up to return from userspace.  If provided, use a stub
       already in userspace.  */
    if (ka->sa_flags & TARGET_SA_RESTORER) {
        regs->pr = (unsigned long) ka->sa_restorer;
    } else {
        /* Generate return code (system call to sigreturn) */
        abi_ulong retcode_addr = frame_addr +
                                 offsetof(struct target_rt_sigframe, retcode);
        __put_user(MOVW(2), &frame->retcode[0]);
        __put_user(TRAP_NOARG, &frame->retcode[1]);
        __put_user((TARGET_NR_rt_sigreturn), &frame->retcode[2]);
        regs->pr = (unsigned long) retcode_addr;
    }

    /* Set up registers for signal handler */
    regs->gregs[15] = frame_addr;
    regs->gregs[4] = sig; /* Arg for signal handler */
    regs->gregs[5] = frame_addr + offsetof(typeof(*frame), info);
    regs->gregs[6] = frame_addr + offsetof(typeof(*frame), uc);
    regs->pc = (unsigned long) ka->_sa_handler;
    regs->flags &= ~(DELAY_SLOT_MASK | GUSA_MASK);

    unlock_user_struct(frame, frame_addr, 1);
    return;

give_sigsegv:
    unlock_user_struct(frame, frame_addr, 1);
    force_sigsegv(sig);
}

long do_sigreturn(CPUSH4State *regs)
{
    struct target_sigframe *frame;
    abi_ulong frame_addr;
    sigset_t blocked;
    target_sigset_t target_set;
    int i;

    frame_addr = regs->gregs[15];
    trace_user_do_sigreturn(regs, frame_addr);
    if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) {
        goto badframe;
    }

    __get_user(target_set.sig[0], &frame->sc.oldmask);
    for(i = 1; i < TARGET_NSIG_WORDS; i++) {
        __get_user(target_set.sig[i], &frame->extramask[i - 1]);
    }

    target_to_host_sigset_internal(&blocked, &target_set);
    set_sigmask(&blocked);

    restore_sigcontext(regs, &frame->sc);

    unlock_user_struct(frame, frame_addr, 0);
    return -TARGET_QEMU_ESIGRETURN;

badframe:
    unlock_user_struct(frame, frame_addr, 0);
    force_sig(TARGET_SIGSEGV);
    return -TARGET_QEMU_ESIGRETURN;
}

long do_rt_sigreturn(CPUSH4State *regs)
{
    struct target_rt_sigframe *frame;
    abi_ulong frame_addr;
    sigset_t blocked;

    frame_addr = regs->gregs[15];
    trace_user_do_rt_sigreturn(regs, frame_addr);
    if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) {
        goto badframe;
    }

    target_to_host_sigset(&blocked, &frame->uc.tuc_sigmask);
    set_sigmask(&blocked);

    restore_sigcontext(regs, &frame->uc.tuc_mcontext);
    target_restore_altstack(&frame->uc.tuc_stack, regs);

    unlock_user_struct(frame, frame_addr, 0);
    return -TARGET_QEMU_ESIGRETURN;

badframe:
    unlock_user_struct(frame, frame_addr, 0);
    force_sig(TARGET_SIGSEGV);
    return -TARGET_QEMU_ESIGRETURN;
}
Commit	Line	Data
befb7447 LV	1	/*
	2	* Emulation of Linux signals
	3	*
	4	* Copyright (c) 2003 Fabrice Bellard
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, see <http://www.gnu.org/licenses/>.
	18	*/
0f22162a LV	19	#include "qemu/osdep.h"
0f22162a LV	20	#include "qemu.h"
0f22162a LV	21	#include "signal-common.h"
	22	#include "linux-user/trace.h"
	23
	24	/*
	25	* code and data structures from linux kernel:
	26	* include/asm-sh/sigcontext.h
	27	* arch/sh/kernel/signal.c
	28	*/
	29
	30	struct target_sigcontext {
	31	target_ulong oldmask;
	32
	33	/* CPU registers */
	34	target_ulong sc_gregs[16];
	35	target_ulong sc_pc;
	36	target_ulong sc_pr;
	37	target_ulong sc_sr;
	38	target_ulong sc_gbr;
	39	target_ulong sc_mach;
	40	target_ulong sc_macl;
	41
	42	/* FPU registers */
	43	target_ulong sc_fpregs[16];
	44	target_ulong sc_xfpregs[16];
	45	unsigned int sc_fpscr;
	46	unsigned int sc_fpul;
	47	unsigned int sc_ownedfp;
	48	};
	49
	50	struct target_sigframe
	51	{
	52	struct target_sigcontext sc;
	53	target_ulong extramask[TARGET_NSIG_WORDS-1];
	54	uint16_t retcode[3];
	55	};
	56
	57
	58	struct target_ucontext {
	59	target_ulong tuc_flags;
	60	struct target_ucontext *tuc_link;
	61	target_stack_t tuc_stack;
	62	struct target_sigcontext tuc_mcontext;
	63	target_sigset_t tuc_sigmask; /* mask last for extensibility */
	64	};
	65
	66	struct target_rt_sigframe
	67	{
	68	struct target_siginfo info;
	69	struct target_ucontext uc;
	70	uint16_t retcode[3];
	71	};
	72
	73
	74	#define MOVW(n) (0x9300\|((n)-2)) /* Move mem word at PC+n to R3 */
	75	#define TRAP_NOARG 0xc310 /* Syscall w/no args (NR in R3) SH3/4 */
	76
	77	static abi_ulong get_sigframe(struct target_sigaction *ka,
	78	unsigned long sp, size_t frame_size)
	79	{
465e237b	80	sp = target_sigsp(sp, ka);
0f22162a LV	81
	82	return (sp - frame_size) & -8ul;
	83	}
	84
6cc9d67c RH	85	/*
	86	* Notice when we're in the middle of a gUSA region and reset.
	87	* Note that this will only occur when #CF_PARALLEL is unset, as we
	88	* will translate such sequences differently in a parallel context.
	89	*/
0f22162a LV	90	static void unwind_gusa(CPUSH4State *regs)
	91	{
	92	/* If the stack pointer is sufficiently negative, and we haven't
	93	completed the sequence, then reset to the entry to the region. */
	94	/* ??? The SH4 kernel checks for and address above 0xC0000000.
	95	However, the page mappings in qemu linux-user aren't as restricted
	96	and we wind up with the normal stack mapped above 0xF0000000.
	97	That said, there is no reason why the kernel should be allowing
	98	a gUSA region that spans 1GB. Use a tighter check here, for what
	99	can actually be enabled by the immediate move. */
	100	if (regs->gregs[15] >= -128u && regs->pc < regs->gregs[0]) {
	101	/* Reset the PC to before the gUSA region, as computed from
	102	R0 = region end, SP = -(region size), plus one more for the
	103	insn that actually initializes SP to the region size. */
	104	regs->pc = regs->gregs[0] + regs->gregs[15] - 2;
	105
	106	/* Reset the SP to the saved version in R1. */
	107	regs->gregs[15] = regs->gregs[1];
	108	}
	109	}
	110
	111	static void setup_sigcontext(struct target_sigcontext *sc,
	112	CPUSH4State *regs, unsigned long mask)
	113	{
	114	int i;
	115
	116	#define COPY(x) __put_user(regs->x, &sc->sc_##x)
	117	COPY(gregs[0]); COPY(gregs[1]);
	118	COPY(gregs[2]); COPY(gregs[3]);
	119	COPY(gregs[4]); COPY(gregs[5]);
	120	COPY(gregs[6]); COPY(gregs[7]);
	121	COPY(gregs[8]); COPY(gregs[9]);
	122	COPY(gregs[10]); COPY(gregs[11]);
	123	COPY(gregs[12]); COPY(gregs[13]);
	124	COPY(gregs[14]); COPY(gregs[15]);
	125	COPY(gbr); COPY(mach);
	126	COPY(macl); COPY(pr);
	127	COPY(sr); COPY(pc);
	128	#undef COPY
	129
	130	for (i=0; i<16; i++) {
	131	__put_user(regs->fregs[i], &sc->sc_fpregs[i]);
	132	}
	133	__put_user(regs->fpscr, &sc->sc_fpscr);
	134	__put_user(regs->fpul, &sc->sc_fpul);
	135
	136	/* non-iBCS2 extensions.. */
	137	__put_user(mask, &sc->oldmask);
	138	}
	139
	140	static void restore_sigcontext(CPUSH4State regs, struct target_sigcontext sc)
	141	{
	142	int i;
	143
	144	#define COPY(x) __get_user(regs->x, &sc->sc_##x)
	145	COPY(gregs[0]); COPY(gregs[1]);
	146	COPY(gregs[2]); COPY(gregs[3]);
	147	COPY(gregs[4]); COPY(gregs[5]);
	148	COPY(gregs[6]); COPY(gregs[7]);
	149	COPY(gregs[8]); COPY(gregs[9]);
	150	COPY(gregs[10]); COPY(gregs[11]);
	151	COPY(gregs[12]); COPY(gregs[13]);
	152	COPY(gregs[14]); COPY(gregs[15]);
	153	COPY(gbr); COPY(mach);
154	COPY(macl); COPY(pr);
155	COPY(sr); COPY(pc);
156	#undef COPY
157
158	for (i=0; i<16; i++) {
159	__get_user(regs->fregs[i], &sc->sc_fpregs[i]);
160	}
161	__get_user(regs->fpscr, &sc->sc_fpscr);
162	__get_user(regs->fpul, &sc->sc_fpul);
163
164	regs->tra = -1; /* disable syscall checks */
165	regs->flags &= ~(DELAY_SLOT_MASK \| GUSA_MASK);
166	}
167
168	void setup_frame(int sig, struct target_sigaction *ka,
169	target_sigset_t set, CPUSH4State regs)
170	{
171	struct target_sigframe *frame;
172	abi_ulong frame_addr;
173	int i;
174
175	unwind_gusa(regs);
176
177	frame_addr = get_sigframe(ka, regs->gregs[15], sizeof(*frame));
178	trace_user_setup_frame(regs, frame_addr);
179	if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) {
180	goto give_sigsegv;
181	}
182
183	setup_sigcontext(&frame->sc, regs, set->sig[0]);
184
185	for (i = 0; i < TARGET_NSIG_WORDS - 1; i++) {
186	__put_user(set->sig[i + 1], &frame->extramask[i]);
187	}
188
189	/* Set up to return from userspace. If provided, use a stub
190	already in userspace. */
191	if (ka->sa_flags & TARGET_SA_RESTORER) {
192	regs->pr = (unsigned long) ka->sa_restorer;
193	} else {
194	/* Generate return code (system call to sigreturn) */
195	abi_ulong retcode_addr = frame_addr +
196	offsetof(struct target_sigframe, retcode);
197	__put_user(MOVW(2), &frame->retcode[0]);
198	__put_user(TRAP_NOARG, &frame->retcode[1]);
199	__put_user((TARGET_NR_sigreturn), &frame->retcode[2]);
200	regs->pr = (unsigned long) retcode_addr;
201	}
202
203	/* Set up registers for signal handler */
204	regs->gregs[15] = frame_addr;
205	regs->gregs[4] = sig; /* Arg for signal handler */
206	regs->gregs[5] = 0;
207	regs->gregs[6] = frame_addr += offsetof(typeof(*frame), sc);
208	regs->pc = (unsigned long) ka->_sa_handler;
209	regs->flags &= ~(DELAY_SLOT_MASK \| GUSA_MASK);
210
211	unlock_user_struct(frame, frame_addr, 1);
212	return;
213
214	give_sigsegv:
215	unlock_user_struct(frame, frame_addr, 1);
216	force_sigsegv(sig);
217	}
218
219	void setup_rt_frame(int sig, struct target_sigaction *ka,
220	target_siginfo_t *info,
221	target_sigset_t set, CPUSH4State regs)
222	{
223	struct target_rt_sigframe *frame;
224	abi_ulong frame_addr;
225	int i;
226
227	unwind_gusa(regs);
228
229	frame_addr = get_sigframe(ka, regs->gregs[15], sizeof(*frame));
230	trace_user_setup_rt_frame(regs, frame_addr);
231	if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) {
232	goto give_sigsegv;
233	}
234
235	tswap_siginfo(&frame->info, info);
236
237	/* Create the ucontext. */
238	__put_user(0, &frame->uc.tuc_flags);
239	__put_user(0, (unsigned long *)&frame->uc.tuc_link);
465e237b	240	target_save_altstack(&frame->uc.tuc_stack, regs);
0f22162a LV	241	setup_sigcontext(&frame->uc.tuc_mcontext,
	242	regs, set->sig[0]);
	243	for(i = 0; i < TARGET_NSIG_WORDS; i++) {
	244	__put_user(set->sig[i], &frame->uc.tuc_sigmask.sig[i]);
	245	}
	246
	247	/* Set up to return from userspace. If provided, use a stub
	248	already in userspace. */
	249	if (ka->sa_flags & TARGET_SA_RESTORER) {
	250	regs->pr = (unsigned long) ka->sa_restorer;
	251	} else {
	252	/* Generate return code (system call to sigreturn) */
	253	abi_ulong retcode_addr = frame_addr +
	254	offsetof(struct target_rt_sigframe, retcode);
	255	__put_user(MOVW(2), &frame->retcode[0]);
	256	__put_user(TRAP_NOARG, &frame->retcode[1]);
	257	__put_user((TARGET_NR_rt_sigreturn), &frame->retcode[2]);
	258	regs->pr = (unsigned long) retcode_addr;
	259	}
	260
	261	/* Set up registers for signal handler */
	262	regs->gregs[15] = frame_addr;
	263	regs->gregs[4] = sig; /* Arg for signal handler */
	264	regs->gregs[5] = frame_addr + offsetof(typeof(*frame), info);
	265	regs->gregs[6] = frame_addr + offsetof(typeof(*frame), uc);
	266	regs->pc = (unsigned long) ka->_sa_handler;
	267	regs->flags &= ~(DELAY_SLOT_MASK \| GUSA_MASK);
	268
	269	unlock_user_struct(frame, frame_addr, 1);
	270	return;
	271
	272	give_sigsegv:
	273	unlock_user_struct(frame, frame_addr, 1);
	274	force_sigsegv(sig);
	275	}
	276
	277	long do_sigreturn(CPUSH4State *regs)
	278	{
	279	struct target_sigframe *frame;
	280	abi_ulong frame_addr;
	281	sigset_t blocked;
	282	target_sigset_t target_set;
	283	int i;
0f22162a LV	284
	285	frame_addr = regs->gregs[15];
	286	trace_user_do_sigreturn(regs, frame_addr);
	287	if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) {
	288	goto badframe;
	289	}
	290
	291	__get_user(target_set.sig[0], &frame->sc.oldmask);
	292	for(i = 1; i < TARGET_NSIG_WORDS; i++) {
	293	__get_user(target_set.sig[i], &frame->extramask[i - 1]);
	294	}
	295
0f22162a LV	296	target_to_host_sigset_internal(&blocked, &target_set);
	297	set_sigmask(&blocked);
	298
	299	restore_sigcontext(regs, &frame->sc);
	300
	301	unlock_user_struct(frame, frame_addr, 0);
	302	return -TARGET_QEMU_ESIGRETURN;
	303
	304	badframe:
	305	unlock_user_struct(frame, frame_addr, 0);
	306	force_sig(TARGET_SIGSEGV);
	307	return -TARGET_QEMU_ESIGRETURN;
	308	}
	309
	310	long do_rt_sigreturn(CPUSH4State *regs)
	311	{
	312	struct target_rt_sigframe *frame;
	313	abi_ulong frame_addr;
	314	sigset_t blocked;
	315
	316	frame_addr = regs->gregs[15];
	317	trace_user_do_rt_sigreturn(regs, frame_addr);
	318	if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) {
	319	goto badframe;
	320	}
	321
	322	target_to_host_sigset(&blocked, &frame->uc.tuc_sigmask);
	323	set_sigmask(&blocked);
	324
	325	restore_sigcontext(regs, &frame->uc.tuc_mcontext);
ddc3e74d	326	target_restore_altstack(&frame->uc.tuc_stack, regs);
0f22162a LV	327
	328	unlock_user_struct(frame, frame_addr, 0);
	329	return -TARGET_QEMU_ESIGRETURN;
	330
	331	badframe:
	332	unlock_user_struct(frame, frame_addr, 0);
	333	force_sig(TARGET_SIGSEGV);
	334	return -TARGET_QEMU_ESIGRETURN;
	335	}