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Diffstat (limited to 'libjava/include/i386-signal.h')
| -rw-r--r-- | libjava/include/i386-signal.h | 148 |
1 files changed, 0 insertions, 148 deletions
diff --git a/libjava/include/i386-signal.h b/libjava/include/i386-signal.h deleted file mode 100644 index 599edc940ad..00000000000 --- a/libjava/include/i386-signal.h +++ /dev/null @@ -1,148 +0,0 @@ -// i386-signal.h - Catch runtime signals and turn them into exceptions. - -/* Copyright (C) 1998, 1999 Free Software Foundation - - 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 - * to iBCS2. This includes all versions of Linux more recent than 1.3 - */ - - -#ifndef JAVA_SIGNAL_H -#define JAVA_SIGNAL_H 1 - -#include <signal.h> - -#define HANDLE_SEGV 1 -#define HANDLE_FPE 1 - -#define SIGNAL_HANDLER(_name) \ -static void _name (int _dummy) - -#define MAKE_THROW_FRAME(_exception) \ -do \ -{ \ - void **_p = (void **)&_dummy; \ - struct sigcontext_struct *_regs = (struct sigcontext_struct *)++_p; \ - \ - register unsigned long _ebp = _regs->ebp; \ - register unsigned char *_eip = (unsigned char *)_regs->eip; \ - \ - /* 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; \ - \ - 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. \ - \ - */ \ - \ - 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]; \ - } \ - 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; \ - } \ - } \ - \ - asm volatile ("mov %0, (%%ebp); mov %1, 4(%%ebp)" \ - : : "r"(_ebp), "r"(_eip)); \ -} \ -while (0) - -#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; \ - __sigaction (SIGSEGV, &act, NULL); \ - } \ -while (0) - -#define INIT_FPE \ -do \ - { \ - arithexception = new java::lang::ArithmeticException \ - (JvNewStringLatin1 ("/ by zero")); \ - struct sigaction act; \ - act.sa_handler = catch_fpe; \ - sigemptyset (&act.sa_mask); \ - act.sa_flags = 0; \ - __sigaction (SIGFPE, &act, NULL); \ - } \ -while (0) - -#endif /* JAVA_SIGNAL_H */ - |