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i386-signal.h (old_i386_kernel_sigaction): New.

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2002-03-18  Andrew Haley  <aph@cambridge.redhat.com>

        * include/i386-signal.h (old_i386_kernel_sigaction): New.
        INIT_SEGV: Use old_i386_kernel_sigaction.
        INIT_FP: Likewise.

From-SVN: r50980
This commit is contained in:
Andrew Haley 2002-03-18 17:11:43 +00:00 committed by Andrew Haley
parent b663bcf33f
commit 71c6877d3e
2 changed files with 47 additions and 26 deletions
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6
libjava/ChangeLog
View File

@ -1,3 +1,9 @@
2002-03-18 Andrew Haley <aph@cambridge.redhat.com>
* include/i386-signal.h (old_i386_kernel_sigaction): New.
INIT_SEGV: Use old_i386_kernel_sigaction.
INIT_FP: Likewise.
2002-03-18 Bryce McKinlay <bryce@waitaki.otago.ac.nz>
* java/lang/natSystem.cc (init_properties): Update VM version

67
libjava/include/i386-signal.h
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@ -1,6 +1,7 @@
// i386-signal.h - Catch runtime signals and turn them into exceptions.
// i386-signal.h - Catch runtime signals and turn them into exceptions
// on an i386 based Linux system.
/* Copyright (C) 1998, 1999, 2001 Free Software Foundation
/* Copyright (C) 1998, 1999, 2001, 2002 Free Software Foundation
This file is part of libgcj.
@ -8,10 +9,6 @@ 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
@ -99,28 +96,40 @@ do \
} \
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; \
syscall (SYS_sigaction, SIGSEGV, &act, NULL); \
} \
/* We use old_kernel_sigaction here because we're calling the kernel
directly rather than via glibc. The sigaction structure that the
syscall uses is a different shape from the one in userland and not
visible to us in a header file so we define it here. */
struct old_i386_kernel_sigaction {
void (*k_sa_handler) (int);
unsigned long k_sa_mask;
unsigned long k_sa_flags;
void (*sa_restorer) (void);
};
#define INIT_SEGV \
do \
{ \
nullp = new java::lang::NullPointerException (); \
struct old_i386_kernel_sigaction kact; \
kact.k_sa_handler = catch_segv; \
kact.k_sa_mask = 0; \
kact.k_sa_flags = 0; \
syscall (SYS_sigaction, SIGSEGV, &kact, NULL); \
} \
while (0)
#define INIT_FPE \
do \
{ \
arithexception = new java::lang::ArithmeticException \
{ \
arithexception = new java::lang::ArithmeticException \
(JvNewStringLatin1 ("/ by zero")); \
struct sigaction act; \
act.sa_handler = catch_fpe; \
sigemptyset (&act.sa_mask); \
act.sa_flags = 0; \
syscall (SYS_sigaction, SIGFPE, &act, NULL); \
struct old_i386_kernel_sigaction kact; \
kact.k_sa_handler = catch_fpe; \
kact.k_sa_mask = 0; \
kact.k_sa_flags = 0; \
syscall (SYS_sigaction, SIGFPE, &kact, NULL); \
} \
while (0)
@ -133,9 +142,15 @@ while (0)
* when returning from a signal handler. If we return from our divide
* handler to a linuxthreads wrapper, we will lose the PC adjustment
* we made and return to the faulting instruction again. Using
* syscall(SYS_sigaction) causes our handler to be called directly by
* the kernel, bypassing any wrappers. This is a kludge, and a future
* version of this handler will do something better. */
* syscall(SYS_sigaction) causes our handler to be called directly
* by the kernel, bypassing any wrappers.
* Also, there is at the present time no unwind info in the
* linuxthreads library's signal handlers and so we can't unwind
* through them anyway.
* Finally, the code that glibc uses to return from a signal handler
* is subject to change. */
#endif /* JAVA_SIGNAL_H */