mirror of
git://gcc.gnu.org/git/gcc.git
synced 2024-12-19 03:58:58 +08:00
85 lines
2.6 KiB
C
85 lines
2.6 KiB
C
// powerpc-signal.h - Catch runtime signals and turn them into exceptions
|
|
// on a powerpc based Linux system.
|
|
|
|
/* Copyright (C) 2003 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. */
|
|
|
|
|
|
#ifndef JAVA_SIGNAL_H
|
|
# define JAVA_SIGNAL_H 1
|
|
|
|
# include <signal.h>
|
|
# include <sys/syscall.h>
|
|
|
|
# define HANDLE_SEGV 1
|
|
# undef HANDLE_FPE
|
|
|
|
# define SIGNAL_HANDLER(_name) \
|
|
static void _name (int /* _signal */, struct sigcontext *_sc)
|
|
|
|
/* PPC either leaves PC pointing at a faulting instruction or the
|
|
following instruction, depending on the signal. SEGV always does
|
|
the former, so we adjust the saved PC to point to the following
|
|
instruction. This is what the handler in libgcc expects. */
|
|
|
|
# define MAKE_THROW_FRAME(_exception) \
|
|
do \
|
|
{ \
|
|
_sc->regs->nip += 4; \
|
|
} \
|
|
while (0)
|
|
|
|
/* For an explanation why we cannot simply use sigaction to
|
|
install the handlers, see i386-signal.h. */
|
|
|
|
/* We use kernel_old_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.
|
|
Additionally we want a proper prototype for the handler function
|
|
with the struct sigcontext pointer passed by the kernel as the 2nd
|
|
argument, which isn't there in userland headers.
|
|
|
|
Note that we explicitly avoid the SA_SIGINFO flag in INIT_SEGV and
|
|
INIT_FPE below. Using the ucontext pointer passed as 3rd argument
|
|
of a SA_SIGINFO type handler would need complicated backwards
|
|
compatibility hacks in MAKE_THROW_FRAME, as the ucontext layout
|
|
on PPC changed during the 2.5 kernel series. */
|
|
|
|
struct kernel_old_sigaction {
|
|
void (*k_sa_handler) (int, struct sigcontext *);
|
|
unsigned long k_sa_mask;
|
|
unsigned long k_sa_flags;
|
|
void (*k_sa_restorer) (void);
|
|
};
|
|
|
|
# define INIT_SEGV \
|
|
do \
|
|
{ \
|
|
struct kernel_old_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 \
|
|
{ \
|
|
struct kernel_old_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)
|
|
|
|
#endif /* JAVA_SIGNAL_H */
|
|
|