1999-04-13 11:18:09 +02:00
|
|
|
// i386-signal.h - Catch runtime signals and turn them into exceptions.
|
|
|
|
|
|
|
|
/* Copyright (C) 1998, 1999 Cygnus Solutions
|
|
|
|
|
|
|
|
This file is part of libgcj.
|
|
|
|
|
|
|
|
This software is copyrighted work licensed under the terms of the
|
|
|
|
Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
|
|
|
|
details. */
|
|
|
|
|
|
|
|
/* This technique should work for all i386 based Unices which conform
|
1999-04-20 08:27:11 +02:00
|
|
|
* to iBCS2. This includes all versions of Linux more recent than 1.3
|
|
|
|
*/
|
1999-04-13 11:18:09 +02:00
|
|
|
|
|
|
|
|
|
|
|
#ifndef JAVA_SIGNAL_H
|
|
|
|
#define JAVA_SIGNAL_H 1
|
|
|
|
|
|
|
|
#include <signal.h>
|
|
|
|
|
|
|
|
#define HANDLE_SEGV 1
|
|
|
|
#define HANDLE_FPE 1
|
|
|
|
|
1999-04-20 08:27:11 +02:00
|
|
|
#define SIGNAL_HANDLER(_name) \
|
|
|
|
static void _name (int _dummy)
|
1999-04-13 11:18:09 +02:00
|
|
|
|
1999-04-20 08:27:11 +02:00
|
|
|
#define MAKE_THROW_FRAME \
|
1999-05-20 10:26:55 +02:00
|
|
|
do \
|
1999-04-13 11:18:09 +02:00
|
|
|
{ \
|
|
|
|
void **_p = (void **)&_dummy; \
|
|
|
|
struct sigcontext_struct *_regs = (struct sigcontext_struct *)++_p; \
|
|
|
|
\
|
|
|
|
register unsigned long _ebp = _regs->ebp; \
|
1999-05-20 10:26:55 +02:00
|
|
|
register unsigned char *_eip = (unsigned char *)_regs->eip; \
|
|
|
|
\
|
1999-07-07 11:09:39 +02:00
|
|
|
/* Advance the program counter so that it is after the start of the \
|
|
|
|
instruction: the x86 exception handler expects \
|
|
|
|
the PC to point to the instruction after a call. */ \
|
|
|
|
_eip += 2; \
|
|
|
|
\
|
1999-05-20 10:26:55 +02:00
|
|
|
asm volatile ("mov %0, (%%ebp); mov %1, 4(%%ebp)" \
|
|
|
|
: : "r"(_ebp), "r"(_eip)); \
|
|
|
|
} \
|
|
|
|
while (0)
|
|
|
|
|
|
|
|
#define HANDLE_DIVIDE_OVERFLOW \
|
|
|
|
do \
|
|
|
|
{ \
|
|
|
|
void **_p = (void **)&_dummy; \
|
|
|
|
struct sigcontext_struct *_regs = (struct sigcontext_struct *)++_p; \
|
|
|
|
\
|
|
|
|
register unsigned long *_ebp = (unsigned long *)_regs->ebp; \
|
|
|
|
register unsigned char *_eip = (unsigned char *)_regs->eip; \
|
|
|
|
\
|
|
|
|
/* According to the JVM spec, "if the dividend is the negative \
|
|
|
|
* integer of the smallest magnitude and the divisor is -1, then \
|
|
|
|
* overflow occurs and the result is equal to the dividend. Despite \
|
|
|
|
* the overflow, no exception occurs". \
|
|
|
|
\
|
|
|
|
* We handle this by inspecting the instruction which generated the \
|
|
|
|
* signal and advancing eip to point to the following instruction. \
|
|
|
|
* As the instructions are variable length it is necessary to do a \
|
|
|
|
* little calculation to figure out where the following instruction \
|
|
|
|
* actually is. \
|
1999-07-07 11:09:39 +02:00
|
|
|
\
|
1999-05-20 10:26:55 +02:00
|
|
|
*/ \
|
|
|
|
\
|
|
|
|
if (_eip[0] == 0xf7) \
|
|
|
|
{ \
|
|
|
|
unsigned char _modrm = _eip[1]; \
|
|
|
|
\
|
|
|
|
if (_regs->eax == 0x80000000 \
|
|
|
|
&& ((_modrm >> 3) & 7) == 7) /* Signed divide */ \
|
|
|
|
{ \
|
|
|
|
_regs->edx = 0; /* the remainder is zero */ \
|
|
|
|
switch (_modrm >> 6) \
|
|
|
|
{ \
|
|
|
|
case 0: \
|
|
|
|
if ((_modrm & 7) == 5) \
|
|
|
|
_eip += 4; \
|
|
|
|
break; \
|
|
|
|
case 1: \
|
|
|
|
_eip += 1; \
|
|
|
|
break; \
|
|
|
|
case 2: \
|
|
|
|
_eip += 4; \
|
|
|
|
break; \
|
|
|
|
case 3: \
|
|
|
|
break; \
|
|
|
|
} \
|
|
|
|
_eip += 2; \
|
|
|
|
_regs->eip = (unsigned long)_eip; \
|
|
|
|
return; \
|
|
|
|
} \
|
|
|
|
else if (((_modrm >> 3) & 7) == 6) /* Unsigned divide */ \
|
|
|
|
{ \
|
|
|
|
/* We assume that unsigned divisions are in library code, so \
|
|
|
|
* we throw one level down the stack, which was hopefully \
|
|
|
|
* the place that called the library routine. This will \
|
|
|
|
* break if the library is ever compiled with \
|
|
|
|
* -fomit-frame-pointer, but at least this way we've got a \
|
|
|
|
* good chance of finding the exception handler. */ \
|
|
|
|
\
|
|
|
|
_eip = (unsigned char *)_ebp[1]; \
|
|
|
|
_ebp = (unsigned long *)_ebp[0]; \
|
|
|
|
} \
|
1999-07-07 11:09:39 +02:00
|
|
|
else \
|
|
|
|
{ \
|
|
|
|
/* Advance the program counter so that it is after the start \
|
|
|
|
of the instruction: this is because the x86 exception \
|
|
|
|
handler expects the PC to point to the instruction after a \
|
|
|
|
call. */ \
|
|
|
|
_eip += 2; \
|
|
|
|
} \
|
1999-05-20 10:26:55 +02:00
|
|
|
} \
|
|
|
|
\
|
1999-04-13 11:18:09 +02:00
|
|
|
asm volatile ("mov %0, (%%ebp); mov %1, 4(%%ebp)" \
|
|
|
|
: : "r"(_ebp), "r"(_eip)); \
|
1999-05-20 10:26:55 +02:00
|
|
|
} \
|
|
|
|
while (0)
|
1999-04-13 11:18:09 +02:00
|
|
|
|
1999-04-20 08:27:11 +02:00
|
|
|
#define INIT_SEGV \
|
|
|
|
do \
|
|
|
|
{ \
|
|
|
|
nullp = new java::lang::NullPointerException (); \
|
|
|
|
struct sigaction act; \
|
|
|
|
act.sa_handler = catch_segv; \
|
|
|
|
sigemptyset (&act.sa_mask); \
|
|
|
|
act.sa_flags = 0; \
|
1999-07-01 12:30:58 +02:00
|
|
|
__sigaction (SIGSEGV, &act, NULL); \
|
1999-04-20 08:27:11 +02:00
|
|
|
} \
|
|
|
|
while (0)
|
|
|
|
|
1999-07-07 11:09:39 +02:00
|
|
|
#define INIT_FPE \
|
1999-04-20 08:27:11 +02:00
|
|
|
do \
|
1999-07-07 11:09:39 +02:00
|
|
|
{ \
|
1999-05-20 10:26:55 +02:00
|
|
|
arithexception = new java::lang::ArithmeticException \
|
|
|
|
(JvNewStringLatin1 ("/ by zero")); \
|
1999-04-20 08:27:11 +02:00
|
|
|
struct sigaction act; \
|
|
|
|
act.sa_handler = catch_fpe; \
|
|
|
|
sigemptyset (&act.sa_mask); \
|
|
|
|
act.sa_flags = 0; \
|
1999-07-01 12:30:58 +02:00
|
|
|
__sigaction (SIGFPE, &act, NULL); \
|
1999-04-20 08:27:11 +02:00
|
|
|
} \
|
|
|
|
while (0)
|
|
|
|
|
1999-04-13 11:18:09 +02:00
|
|
|
#endif /* JAVA_SIGNAL_H */
|
|
|
|
|