| 1 |
757 |
jeremybenn |
// s390-signal.h - Catch runtime signals and turn them into exceptions
|
| 2 |
|
|
// on an s390 based Linux system.
|
| 3 |
|
|
|
| 4 |
|
|
/* Copyright (C) 2002, 2010 Free Software Foundation
|
| 5 |
|
|
|
| 6 |
|
|
This file is part of libgcj.
|
| 7 |
|
|
|
| 8 |
|
|
This software is copyrighted work licensed under the terms of the
|
| 9 |
|
|
Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
|
| 10 |
|
|
details. */
|
| 11 |
|
|
|
| 12 |
|
|
|
| 13 |
|
|
#ifndef JAVA_SIGNAL_H
|
| 14 |
|
|
#define JAVA_SIGNAL_H 1
|
| 15 |
|
|
|
| 16 |
|
|
#include <signal.h>
|
| 17 |
|
|
#include <sys/syscall.h>
|
| 18 |
|
|
#include <ucontext.h>
|
| 19 |
|
|
#include <limits.h>
|
| 20 |
|
|
|
| 21 |
|
|
#define HANDLE_SEGV 1
|
| 22 |
|
|
#define HANDLE_FPE 1
|
| 23 |
|
|
|
| 24 |
|
|
#define SIGNAL_HANDLER(_name) \
|
| 25 |
|
|
static void _name (int, siginfo_t *_si __attribute__((unused)), \
|
| 26 |
|
|
ucontext_t *_uc __attribute__((unused)))
|
| 27 |
|
|
|
| 28 |
|
|
/* We no longer need to fiddle with the PSW address in the signal handler;
|
| 29 |
|
|
this is now all handled correctly in MD_FALLBACK_FRAME_STATE_FOR. */
|
| 30 |
|
|
#define MAKE_THROW_FRAME(_exception)
|
| 31 |
|
|
|
| 32 |
|
|
|
| 33 |
|
|
/* According to the JVM spec, "if the dividend is the negative integer
|
| 34 |
|
|
of the smallest magnitude and the divisor is -1, then overflow occurs
|
| 35 |
|
|
and the result is equal to the dividend. Despite the overflow, no
|
| 36 |
|
|
exception occurs".
|
| 37 |
|
|
|
| 38 |
|
|
We handle this by inspecting the instruction which generated the signal,
|
| 39 |
|
|
and if dividend and divisor are as above, we simply return from the signal
|
| 40 |
|
|
handler. This causes execution to continue after the instruction.
|
| 41 |
|
|
Before returning, we the set result registers as expected. */
|
| 42 |
|
|
#define UC_EXTENDED 0x00000001
|
| 43 |
|
|
|
| 44 |
|
|
#define HANDLE_DIVIDE_OVERFLOW \
|
| 45 |
|
|
do \
|
| 46 |
|
|
{ \
|
| 47 |
|
|
unsigned char *_eip = (unsigned char *) \
|
| 48 |
|
|
__builtin_extract_return_addr (_si->si_addr); \
|
| 49 |
|
|
unsigned long *_regs = _uc->uc_mcontext.gregs; \
|
| 50 |
|
|
int _r1, _r2, _d2, _x2, _b2; \
|
| 51 |
|
|
struct \
|
| 52 |
|
|
{ \
|
| 53 |
|
|
unsigned long int uc_flags; \
|
| 54 |
|
|
struct ucontext *uc_link; \
|
| 55 |
|
|
stack_t uc_stack; \
|
| 56 |
|
|
mcontext_t uc_mcontext; \
|
| 57 |
|
|
unsigned long sigmask[2]; \
|
| 58 |
|
|
unsigned long ext_regs[16]; \
|
| 59 |
|
|
} *_uc_ext = (typeof(_uc_ext))_uc; \
|
| 60 |
|
|
\
|
| 61 |
|
|
/* First, a couple of helper routines to decode instructions. */ \
|
| 62 |
|
|
struct _decode \
|
| 63 |
|
|
{ \
|
| 64 |
|
|
/* Decode RR instruction format. */ \
|
| 65 |
|
|
static inline int _is_rr (unsigned char *_eip, \
|
| 66 |
|
|
unsigned char _op, \
|
| 67 |
|
|
int *_r1, int *_r2) \
|
| 68 |
|
|
{ \
|
| 69 |
|
|
if (_eip[0] == _op) \
|
| 70 |
|
|
{ \
|
| 71 |
|
|
*_r1 = _eip[1] >> 4; \
|
| 72 |
|
|
*_r2 = _eip[1] & 0xf; \
|
| 73 |
|
|
return 1; \
|
| 74 |
|
|
} \
|
| 75 |
|
|
return 0; \
|
| 76 |
|
|
} \
|
| 77 |
|
|
\
|
| 78 |
|
|
/* Decode RX instruction format. */ \
|
| 79 |
|
|
static inline int _is_rx (unsigned char *_eip, \
|
| 80 |
|
|
unsigned char _op, \
|
| 81 |
|
|
int *_r1, int *_d2, int *_x2, int *_b2) \
|
| 82 |
|
|
{ \
|
| 83 |
|
|
if (_eip[0] == _op) \
|
| 84 |
|
|
{ \
|
| 85 |
|
|
*_r1 = _eip[1] >> 4; \
|
| 86 |
|
|
*_x2 = _eip[1] & 0xf; \
|
| 87 |
|
|
*_b2 = _eip[2] >> 4; \
|
| 88 |
|
|
*_d2 = ((_eip[2] & 0xf) << 8) + _eip[3]; \
|
| 89 |
|
|
return 1; \
|
| 90 |
|
|
} \
|
| 91 |
|
|
return 0; \
|
| 92 |
|
|
} \
|
| 93 |
|
|
\
|
| 94 |
|
|
/* Decode RRE instruction format. */ \
|
| 95 |
|
|
static inline int _is_rre (unsigned char *_eip, \
|
| 96 |
|
|
unsigned char _op1, unsigned char _op2,\
|
| 97 |
|
|
int *_r1, int *_r2) \
|
| 98 |
|
|
{ \
|
| 99 |
|
|
if (_eip[0] == _op1 && _eip[1] == _op2) \
|
| 100 |
|
|
{ \
|
| 101 |
|
|
*_r1 = _eip[3] >> 4; \
|
| 102 |
|
|
*_r2 = _eip[3] & 0xf; \
|
| 103 |
|
|
return 1; \
|
| 104 |
|
|
} \
|
| 105 |
|
|
return 0; \
|
| 106 |
|
|
} \
|
| 107 |
|
|
\
|
| 108 |
|
|
/* Decode RXY instruction format. */ \
|
| 109 |
|
|
static inline int _is_rxy (unsigned char *_eip, \
|
| 110 |
|
|
unsigned char _op1, unsigned char _op2,\
|
| 111 |
|
|
int *_r1, int *_d2, int *_x2, int *_b2)\
|
| 112 |
|
|
{ \
|
| 113 |
|
|
if (_eip[0] == _op1 && _eip[5] == _op2) \
|
| 114 |
|
|
{ \
|
| 115 |
|
|
*_r1 = _eip[1] >> 4; \
|
| 116 |
|
|
*_x2 = _eip[1] & 0xf; \
|
| 117 |
|
|
*_b2 = _eip[2] >> 4; \
|
| 118 |
|
|
*_d2 = ((_eip[2] & 0xf) << 8) + _eip[3] + (_eip[4] << 12); \
|
| 119 |
|
|
/* We have a 20-bit signed displacement. */ \
|
| 120 |
|
|
*_d2 = (*_d2 ^ 0x80000) - 0x80000; \
|
| 121 |
|
|
return 1; \
|
| 122 |
|
|
} \
|
| 123 |
|
|
return 0; \
|
| 124 |
|
|
} \
|
| 125 |
|
|
\
|
| 126 |
|
|
/* Compute effective address. */ \
|
| 127 |
|
|
static inline unsigned long _eff (unsigned long *_regs, \
|
| 128 |
|
|
long _d, int _x, int _b) \
|
| 129 |
|
|
{ \
|
| 130 |
|
|
return _d + (_x? _regs[_x] : 0) + (_b? _regs[_b] : 0); \
|
| 131 |
|
|
} \
|
| 132 |
|
|
\
|
| 133 |
|
|
static inline int is_long_long_min_p (unsigned long *_regs, \
|
| 134 |
|
|
unsigned long *_ext_regs, \
|
| 135 |
|
|
int _r) \
|
| 136 |
|
|
{ \
|
| 137 |
|
|
return ((long long)_regs[_r] \
|
| 138 |
|
|
| (long long)_ext_regs[_r] << 32) == \
|
| 139 |
|
|
LONG_LONG_MIN; \
|
| 140 |
|
|
} \
|
| 141 |
|
|
}; \
|
| 142 |
|
|
\
|
| 143 |
|
|
/* DR r1,r2 */ \
|
| 144 |
|
|
if (_decode::_is_rr (_eip, 0x1d, &_r1, &_r2) \
|
| 145 |
|
|
&& (int) _regs[_r1] == -1 && (int) _regs[_r1+1] == INT_MIN \
|
| 146 |
|
|
&& (int) _regs[_r2] == -1) \
|
| 147 |
|
|
{ \
|
| 148 |
|
|
_regs[_r1] &= ~0xffffffff; \
|
| 149 |
|
|
return; \
|
| 150 |
|
|
} \
|
| 151 |
|
|
\
|
| 152 |
|
|
/* D r1,d2(x2,b2) */ \
|
| 153 |
|
|
if (_decode::_is_rx (_eip, 0x5d, &_r1, &_d2, &_x2, &_b2) \
|
| 154 |
|
|
&& (int) _regs[_r1] == -1 && (int) _regs[_r1+1] == INT_MIN \
|
| 155 |
|
|
&& *(int *) _decode::_eff (_regs, _d2, _x2, _b2) == -1) \
|
| 156 |
|
|
{ \
|
| 157 |
|
|
_regs[_r1] &= ~0xffffffff; \
|
| 158 |
|
|
return; \
|
| 159 |
|
|
} \
|
| 160 |
|
|
\
|
| 161 |
|
|
/* DSGR r1,r2 */ \
|
| 162 |
|
|
if (_decode::_is_rre (_eip, 0xb9, 0x0d, &_r1, &_r2) \
|
| 163 |
|
|
&& (long) _regs[_r1+1] == LONG_MIN \
|
| 164 |
|
|
&& (long) _regs[_r2] == -1L) \
|
| 165 |
|
|
{ \
|
| 166 |
|
|
_regs[_r1] = 0; \
|
| 167 |
|
|
return; \
|
| 168 |
|
|
} \
|
| 169 |
|
|
\
|
| 170 |
|
|
/* DSGFR r1,r2 */ \
|
| 171 |
|
|
if (_decode::_is_rre (_eip, 0xb9, 0x1d, &_r1, &_r2) \
|
| 172 |
|
|
&& (long) _regs[_r1+1] == LONG_MIN \
|
| 173 |
|
|
&& (int) _regs[_r2] == -1) \
|
| 174 |
|
|
{ \
|
| 175 |
|
|
_regs[_r1] = 0; \
|
| 176 |
|
|
return; \
|
| 177 |
|
|
} \
|
| 178 |
|
|
\
|
| 179 |
|
|
/* DSG r1,d2(x2,b2) */ \
|
| 180 |
|
|
if (_decode::_is_rxy (_eip, 0xe3, 0x0d, &_r1, &_d2, &_x2, &_b2) \
|
| 181 |
|
|
&& (long) _regs[_r1+1] == LONG_MIN \
|
| 182 |
|
|
&& *(long *) _decode::_eff (_regs, _d2, _x2, _b2) == -1L) \
|
| 183 |
|
|
{ \
|
| 184 |
|
|
_regs[_r1] = 0; \
|
| 185 |
|
|
return; \
|
| 186 |
|
|
} \
|
| 187 |
|
|
\
|
| 188 |
|
|
/* DSGF r1,d2(x2,b2) */ \
|
| 189 |
|
|
if (_decode::_is_rxy (_eip, 0xe3, 0x1d, &_r1, &_d2, &_x2, &_b2) \
|
| 190 |
|
|
&& (long) _regs[_r1+1] == LONG_MIN \
|
| 191 |
|
|
&& *(int *) _decode::_eff (_regs, _d2, _x2, _b2) == -1) \
|
| 192 |
|
|
{ \
|
| 193 |
|
|
_regs[_r1] = 0; \
|
| 194 |
|
|
return; \
|
| 195 |
|
|
} \
|
| 196 |
|
|
\
|
| 197 |
|
|
/* The extended ucontext contains the upper halfs of the 64bit \
|
| 198 |
|
|
registers in 31bit applications. */ \
|
| 199 |
|
|
if (_uc->uc_flags & 1 == 1) \
|
| 200 |
|
|
{ \
|
| 201 |
|
|
/* DSGR r1,r2 */ \
|
| 202 |
|
|
if (_decode::_is_rre (_eip, 0xb9, 0x0d, &_r1, &_r2) \
|
| 203 |
|
|
&& (int) _regs[_r2] == -1 \
|
| 204 |
|
|
&& (int) _uc_ext->ext_regs[_r2] == -1 \
|
| 205 |
|
|
&& _decode::is_long_long_min_p (_regs, _uc_ext->ext_regs, \
|
| 206 |
|
|
_r1 + 1)) \
|
| 207 |
|
|
{ \
|
| 208 |
|
|
_regs[_r1] = 0; \
|
| 209 |
|
|
_uc_ext->ext_regs[_r1] = 0; \
|
| 210 |
|
|
return; \
|
| 211 |
|
|
} \
|
| 212 |
|
|
\
|
| 213 |
|
|
/* DSGFR r1,r2 */ \
|
| 214 |
|
|
if (_decode::_is_rre (_eip, 0xb9, 0x1d, &_r1, &_r2) \
|
| 215 |
|
|
&& (int) _regs[_r2] == -1 \
|
| 216 |
|
|
&& _decode::is_long_long_min_p (_regs, _uc_ext->ext_regs, \
|
| 217 |
|
|
_r1 + 1)) \
|
| 218 |
|
|
{ \
|
| 219 |
|
|
_regs[_r1] = 0; \
|
| 220 |
|
|
_uc_ext->ext_regs[_r1] = 0; \
|
| 221 |
|
|
return; \
|
| 222 |
|
|
} \
|
| 223 |
|
|
\
|
| 224 |
|
|
/* DSG r1,d2(x2,b2) */ \
|
| 225 |
|
|
if (_decode::_is_rxy (_eip, 0xe3, 0x0d, &_r1, &_d2, &_x2, &_b2) \
|
| 226 |
|
|
&& *(int *) _decode::_eff (_regs, _d2, _x2, _b2) == -1 \
|
| 227 |
|
|
&& *(int *) _decode::_eff (_regs, _d2 + 4, _x2, _b2) == -1 \
|
| 228 |
|
|
&& _decode::is_long_long_min_p (_regs, _uc_ext->ext_regs, \
|
| 229 |
|
|
_r1 + 1)) \
|
| 230 |
|
|
{ \
|
| 231 |
|
|
_regs[_r1] = 0; \
|
| 232 |
|
|
_uc_ext->ext_regs[_r1] = 0; \
|
| 233 |
|
|
return; \
|
| 234 |
|
|
} \
|
| 235 |
|
|
\
|
| 236 |
|
|
/* DSGF r1,d2(x2,b2) */ \
|
| 237 |
|
|
if (_decode::_is_rxy (_eip, 0xe3, 0x1d, &_r1, &_d2, &_x2, &_b2) \
|
| 238 |
|
|
&& *(int *) _decode::_eff (_regs, _d2, _x2, _b2) == -1 \
|
| 239 |
|
|
&& _decode::is_long_long_min_p (_regs, _uc_ext->ext_regs, \
|
| 240 |
|
|
_r1 + 1)) \
|
| 241 |
|
|
{ \
|
| 242 |
|
|
_regs[_r1] = 0; \
|
| 243 |
|
|
_uc_ext->ext_regs[_r1] = 0; \
|
| 244 |
|
|
return; \
|
| 245 |
|
|
} \
|
| 246 |
|
|
} \
|
| 247 |
|
|
} \
|
| 248 |
|
|
while (0)
|
| 249 |
|
|
|
| 250 |
|
|
/* For an explanation why we cannot simply use sigaction to
|
| 251 |
|
|
install the handlers, see i386-signal.h. */
|
| 252 |
|
|
|
| 253 |
|
|
/* We use old_kernel_sigaction here because we're calling the kernel
|
| 254 |
|
|
directly rather than via glibc. The sigaction structure that the
|
| 255 |
|
|
syscall uses is a different shape from the one in userland and not
|
| 256 |
|
|
visible to us in a header file so we define it here. */
|
| 257 |
|
|
|
| 258 |
|
|
struct old_s390_kernel_sigaction {
|
| 259 |
|
|
void (*k_sa_handler) (int, siginfo_t *, ucontext_t *);
|
| 260 |
|
|
unsigned long k_sa_mask;
|
| 261 |
|
|
unsigned long k_sa_flags;
|
| 262 |
|
|
void (*sa_restorer) (void);
|
| 263 |
|
|
};
|
| 264 |
|
|
|
| 265 |
|
|
#define INIT_SEGV \
|
| 266 |
|
|
do \
|
| 267 |
|
|
{ \
|
| 268 |
|
|
struct old_s390_kernel_sigaction kact; \
|
| 269 |
|
|
kact.k_sa_handler = catch_segv; \
|
| 270 |
|
|
kact.k_sa_mask = 0; \
|
| 271 |
|
|
kact.k_sa_flags = SA_SIGINFO; \
|
| 272 |
|
|
syscall (SYS_sigaction, SIGSEGV, &kact, NULL); \
|
| 273 |
|
|
} \
|
| 274 |
|
|
while (0)
|
| 275 |
|
|
|
| 276 |
|
|
#define INIT_FPE \
|
| 277 |
|
|
do \
|
| 278 |
|
|
{ \
|
| 279 |
|
|
struct old_s390_kernel_sigaction kact; \
|
| 280 |
|
|
kact.k_sa_handler = catch_fpe; \
|
| 281 |
|
|
kact.k_sa_mask = 0; \
|
| 282 |
|
|
kact.k_sa_flags = SA_SIGINFO; \
|
| 283 |
|
|
syscall (SYS_sigaction, SIGFPE, &kact, NULL); \
|
| 284 |
|
|
} \
|
| 285 |
|
|
while (0)
|
| 286 |
|
|
|
| 287 |
|
|
#endif /* JAVA_SIGNAL_H */
|
| 288 |
|
|
|
