2 * Emulation of Linux signals
4 * Copyright (c) 2003 Fabrice Bellard
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.
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.
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/>.
19 #include "qemu/osdep.h"
21 #include "user-internals.h"
22 #include "signal-common.h"
23 #include "linux-user/trace.h"
29 #define __SIGNAL_FRAMESIZE 160 /* FIXME: 31-bit mode -> 96 */
31 #define _SIGCONTEXT_NSIG 64
32 #define _SIGCONTEXT_NSIG_BPW 64 /* FIXME: 31-bit mode -> 32 */
33 #define _SIGCONTEXT_NSIG_WORDS (_SIGCONTEXT_NSIG / _SIGCONTEXT_NSIG_BPW)
34 #define _SIGMASK_COPY_SIZE (sizeof(unsigned long)*_SIGCONTEXT_NSIG_WORDS)
35 #define S390_SYSCALL_OPCODE ((uint16_t)0x0a00)
39 abi_ulong gprs
[__NUM_GPRS
];
40 abi_uint acrs
[__NUM_ACRS
];
41 } target_s390_regs_common
;
46 uint64_t fprs
[__NUM_FPRS
];
47 } target_s390_fp_regs
;
50 target_s390_regs_common regs
;
51 target_s390_fp_regs fpregs
;
55 uint64_t vxrs_low
[16];
56 uint64_t vxrs_high
[16][2];
57 uint8_t reserved
[128];
61 abi_ulong oldmask
[_SIGCONTEXT_NSIG_WORDS
];
66 uint8_t callee_used_stack
[__SIGNAL_FRAMESIZE
];
70 target_sigregs_ext sregs_ext
;
73 #define TARGET_UC_VXRS 2
75 struct target_ucontext
{
78 target_stack_t tuc_stack
;
79 target_sigregs tuc_mcontext
;
80 target_sigset_t tuc_sigmask
;
81 uint8_t reserved
[128 - sizeof(target_sigset_t
)];
82 target_sigregs_ext tuc_mcontext_ext
;
86 uint8_t callee_used_stack
[__SIGNAL_FRAMESIZE
];
88 * This field is no longer initialized by the kernel, but it's still a part
92 struct target_siginfo info
;
93 struct target_ucontext uc
;
96 static inline abi_ulong
97 get_sigframe(struct target_sigaction
*ka
, CPUS390XState
*env
, size_t frame_size
)
101 /* Default to using normal stack */
102 sp
= get_sp_from_cpustate(env
);
104 /* This is the X/Open sanctioned signal stack switching. */
105 if (ka
->sa_flags
& TARGET_SA_ONSTACK
) {
106 sp
= target_sigsp(sp
, ka
);
109 /* This is the legacy signal stack switching. */
110 else if (/* FIXME !user_mode(regs) */ 0 &&
111 !(ka
->sa_flags
& TARGET_SA_RESTORER
) &&
113 sp
= (abi_ulong
) ka
->sa_restorer
;
116 return (sp
- frame_size
) & -8ul;
119 #define PSW_USER_BITS (PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT | \
120 PSW_MASK_MCHECK | PSW_MASK_PSTATE | PSW_ASC_PRIMARY)
121 #define PSW_MASK_USER (PSW_MASK_ASC | PSW_MASK_CC | PSW_MASK_PM | \
122 PSW_MASK_64 | PSW_MASK_32)
124 static void save_sigregs(CPUS390XState
*env
, target_sigregs
*sregs
)
126 uint64_t psw_mask
= s390_cpu_get_psw_mask(env
);
130 * Copy a 'clean' PSW mask to the user to avoid leaking
131 * information about whether PER is currently on.
132 * TODO: qemu does not support PSW_MASK_RI; it will never be set.
134 psw_mask
= PSW_USER_BITS
| (psw_mask
& PSW_MASK_USER
);
135 __put_user(psw_mask
, &sregs
->regs
.psw
.mask
);
136 __put_user(env
->psw
.addr
, &sregs
->regs
.psw
.addr
);
138 for (i
= 0; i
< 16; i
++) {
139 __put_user(env
->regs
[i
], &sregs
->regs
.gprs
[i
]);
141 for (i
= 0; i
< 16; i
++) {
142 __put_user(env
->aregs
[i
], &sregs
->regs
.acrs
[i
]);
146 * We have to store the fp registers to current->thread.fp_regs
147 * to merge them with the emulated registers.
149 for (i
= 0; i
< 16; i
++) {
150 __put_user(*get_freg(env
, i
), &sregs
->fpregs
.fprs
[i
]);
154 static void save_sigregs_ext(CPUS390XState
*env
, target_sigregs_ext
*ext
)
159 * if (MACHINE_HAS_VX) ...
160 * That said, we always allocate the stack storage and the
161 * space is always available in env.
163 for (i
= 0; i
< 16; ++i
) {
164 __put_user(env
->vregs
[i
][1], &ext
->vxrs_low
[i
]);
166 for (i
= 0; i
< 16; ++i
) {
167 __put_user(env
->vregs
[i
+ 16][0], &ext
->vxrs_high
[i
][0]);
168 __put_user(env
->vregs
[i
+ 16][1], &ext
->vxrs_high
[i
][1]);
172 void setup_frame(int sig
, struct target_sigaction
*ka
,
173 target_sigset_t
*set
, CPUS390XState
*env
)
176 abi_ulong frame_addr
;
179 frame_addr
= get_sigframe(ka
, env
, sizeof(*frame
));
180 trace_user_setup_frame(env
, frame_addr
);
181 if (!lock_user_struct(VERIFY_WRITE
, frame
, frame_addr
, 0)) {
186 /* Set up backchain. */
187 __put_user(env
->regs
[15], (abi_ulong
*) frame
);
189 /* Create struct sigcontext on the signal stack. */
190 /* Make sure that we're initializing all of oldmask. */
191 QEMU_BUILD_BUG_ON(ARRAY_SIZE(frame
->sc
.oldmask
) != 1);
192 __put_user(set
->sig
[0], &frame
->sc
.oldmask
[0]);
193 __put_user(frame_addr
+ offsetof(sigframe
, sregs
), &frame
->sc
.sregs
);
195 /* Create _sigregs on the signal stack */
196 save_sigregs(env
, &frame
->sregs
);
199 * ??? The kernel uses regs->gprs[2] here, which is not yet the signo.
200 * Moreover the comment talks about allowing backtrace, which is really
201 * done by the r15 copy above.
203 __put_user(sig
, &frame
->signo
);
205 /* Create sigregs_ext on the signal stack. */
206 save_sigregs_ext(env
, &frame
->sregs_ext
);
209 * Set up to return from userspace.
210 * If provided, use a stub already in userspace.
212 if (ka
->sa_flags
& TARGET_SA_RESTORER
) {
213 restorer
= ka
->sa_restorer
;
215 restorer
= default_sigreturn
;
218 /* Set up registers for signal handler */
219 env
->regs
[14] = restorer
;
220 env
->regs
[15] = frame_addr
;
221 /* Force default amode and default user address space control. */
222 env
->psw
.mask
= PSW_MASK_64
| PSW_MASK_32
| PSW_ASC_PRIMARY
223 | (env
->psw
.mask
& ~PSW_MASK_ASC
);
224 env
->psw
.addr
= ka
->_sa_handler
;
227 env
->regs
[3] = frame_addr
+ offsetof(typeof(*frame
), sc
);
230 * We forgot to include these in the sigcontext.
231 * To avoid breaking binary compatibility, they are passed as args.
233 env
->regs
[4] = 0; /* FIXME: regs->int_code & 127 */
234 env
->regs
[5] = 0; /* FIXME: regs->int_parm_long */
235 env
->regs
[6] = 0; /* FIXME: current->thread.last_break */
237 unlock_user_struct(frame
, frame_addr
, 1);
240 void setup_rt_frame(int sig
, struct target_sigaction
*ka
,
241 target_siginfo_t
*info
,
242 target_sigset_t
*set
, CPUS390XState
*env
)
245 abi_ulong frame_addr
;
249 frame_addr
= get_sigframe(ka
, env
, sizeof *frame
);
250 trace_user_setup_rt_frame(env
, frame_addr
);
251 if (!lock_user_struct(VERIFY_WRITE
, frame
, frame_addr
, 0)) {
256 /* Set up backchain. */
257 __put_user(env
->regs
[15], (abi_ulong
*) frame
);
260 * Set up to return from userspace.
261 * If provided, use a stub already in userspace.
263 if (ka
->sa_flags
& TARGET_SA_RESTORER
) {
264 restorer
= ka
->sa_restorer
;
266 restorer
= default_rt_sigreturn
;
269 /* Create siginfo on the signal stack. */
270 tswap_siginfo(&frame
->info
, info
);
272 /* Create ucontext on the signal stack. */
274 if (s390_has_feat(S390_FEAT_VECTOR
)) {
275 uc_flags
|= TARGET_UC_VXRS
;
277 __put_user(uc_flags
, &frame
->uc
.tuc_flags
);
278 __put_user(0, &frame
->uc
.tuc_link
);
279 target_save_altstack(&frame
->uc
.tuc_stack
, env
);
280 save_sigregs(env
, &frame
->uc
.tuc_mcontext
);
281 save_sigregs_ext(env
, &frame
->uc
.tuc_mcontext_ext
);
282 tswap_sigset(&frame
->uc
.tuc_sigmask
, set
);
284 /* Set up registers for signal handler */
285 env
->regs
[14] = restorer
;
286 env
->regs
[15] = frame_addr
;
287 /* Force default amode and default user address space control. */
288 env
->psw
.mask
= PSW_MASK_64
| PSW_MASK_32
| PSW_ASC_PRIMARY
289 | (env
->psw
.mask
& ~PSW_MASK_ASC
);
290 env
->psw
.addr
= ka
->_sa_handler
;
293 env
->regs
[3] = frame_addr
+ offsetof(typeof(*frame
), info
);
294 env
->regs
[4] = frame_addr
+ offsetof(typeof(*frame
), uc
);
295 env
->regs
[5] = 0; /* FIXME: current->thread.last_break */
298 static void restore_sigregs(CPUS390XState
*env
, target_sigregs
*sc
)
300 uint64_t prev_addr
, prev_mask
, mask
, addr
;
303 for (i
= 0; i
< 16; i
++) {
304 __get_user(env
->regs
[i
], &sc
->regs
.gprs
[i
]);
307 prev_addr
= env
->psw
.addr
;
308 __get_user(mask
, &sc
->regs
.psw
.mask
);
309 __get_user(addr
, &sc
->regs
.psw
.addr
);
310 trace_user_s390x_restore_sigregs(env
, addr
, prev_addr
);
313 * Use current psw.mask to preserve PER bit.
315 * if (!is_ri_task(current) && (user_sregs.regs.psw.mask & PSW_MASK_RI))
317 * Simply do not allow it to be set in mask.
319 prev_mask
= s390_cpu_get_psw_mask(env
);
320 mask
= (prev_mask
& ~PSW_MASK_USER
) | (mask
& PSW_MASK_USER
);
321 /* Check for invalid user address space control. */
322 if ((mask
& PSW_MASK_ASC
) == PSW_ASC_HOME
) {
323 mask
= (mask
& ~PSW_MASK_ASC
) | PSW_ASC_PRIMARY
;
325 /* Check for invalid amode. */
326 if (mask
& PSW_MASK_64
) {
329 s390_cpu_set_psw(env
, mask
, addr
);
331 for (i
= 0; i
< 16; i
++) {
332 __get_user(env
->aregs
[i
], &sc
->regs
.acrs
[i
]);
334 for (i
= 0; i
< 16; i
++) {
335 __get_user(*get_freg(env
, i
), &sc
->fpregs
.fprs
[i
]);
339 static void restore_sigregs_ext(CPUS390XState
*env
, target_sigregs_ext
*ext
)
344 * if (MACHINE_HAS_VX) ...
345 * That said, we always allocate the stack storage and the
346 * space is always available in env.
348 for (i
= 0; i
< 16; ++i
) {
349 __get_user(env
->vregs
[i
][1], &ext
->vxrs_low
[i
]);
351 for (i
= 0; i
< 16; ++i
) {
352 __get_user(env
->vregs
[i
+ 16][0], &ext
->vxrs_high
[i
][0]);
353 __get_user(env
->vregs
[i
+ 16][1], &ext
->vxrs_high
[i
][1]);
357 long do_sigreturn(CPUS390XState
*env
)
360 abi_ulong frame_addr
= env
->regs
[15];
361 target_sigset_t target_set
;
364 trace_user_do_sigreturn(env
, frame_addr
);
365 if (!lock_user_struct(VERIFY_READ
, frame
, frame_addr
, 1)) {
366 force_sig(TARGET_SIGSEGV
);
367 return -QEMU_ESIGRETURN
;
370 /* Make sure that we're initializing all of target_set. */
371 QEMU_BUILD_BUG_ON(ARRAY_SIZE(target_set
.sig
) != 1);
372 __get_user(target_set
.sig
[0], &frame
->sc
.oldmask
[0]);
374 target_to_host_sigset_internal(&set
, &target_set
);
375 set_sigmask(&set
); /* ~_BLOCKABLE? */
377 restore_sigregs(env
, &frame
->sregs
);
378 restore_sigregs_ext(env
, &frame
->sregs_ext
);
380 unlock_user_struct(frame
, frame_addr
, 0);
381 return -QEMU_ESIGRETURN
;
384 long do_rt_sigreturn(CPUS390XState
*env
)
387 abi_ulong frame_addr
= env
->regs
[15];
390 trace_user_do_rt_sigreturn(env
, frame_addr
);
391 if (!lock_user_struct(VERIFY_READ
, frame
, frame_addr
, 1)) {
392 force_sig(TARGET_SIGSEGV
);
393 return -QEMU_ESIGRETURN
;
395 target_to_host_sigset(&set
, &frame
->uc
.tuc_sigmask
);
397 set_sigmask(&set
); /* ~_BLOCKABLE? */
399 restore_sigregs(env
, &frame
->uc
.tuc_mcontext
);
400 restore_sigregs_ext(env
, &frame
->uc
.tuc_mcontext_ext
);
402 target_restore_altstack(&frame
->uc
.tuc_stack
, env
);
404 unlock_user_struct(frame
, frame_addr
, 0);
405 return -QEMU_ESIGRETURN
;
408 void setup_sigtramp(abi_ulong sigtramp_page
)
410 uint16_t *tramp
= lock_user(VERIFY_WRITE
, sigtramp_page
, 2 + 2, 0);
411 assert(tramp
!= NULL
);
413 default_sigreturn
= sigtramp_page
;
414 __put_user(S390_SYSCALL_OPCODE
| TARGET_NR_sigreturn
, &tramp
[0]);
416 default_rt_sigreturn
= sigtramp_page
+ 2;
417 __put_user(S390_SYSCALL_OPCODE
| TARGET_NR_rt_sigreturn
, &tramp
[1]);
419 unlock_user(tramp
, sigtramp_page
, 2 + 2);