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ce4b2ca6bc
* include/dwarf2-signal.h (INIT_SEGV, INIT_FPE for ia64): use sigaction instead of __libc_sigaction. From-SVN: r53074
276 lines
8.8 KiB
C++
276 lines
8.8 KiB
C++
// dwarf2-signal.h - Catch runtime signals and turn them into exceptions.
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/* Copyright (C) 2000, 2001 Free Software Foundation
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This file is part of libgcj.
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Use this file for a target for which the dwarf2 unwinder in libgcc
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can unwind through signal handlers.
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This software is copyrighted work licensed under the terms of the
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Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
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details. */
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#ifndef JAVA_SIGNAL_H
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#define JAVA_SIGNAL_H 1
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#include <signal.h>
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#include <sys/syscall.h>
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#define HANDLE_SEGV 1
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#undef HANDLE_FPE
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#define SIGNAL_HANDLER(_name) \
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static void _Jv_##_name (int, siginfo_t *_sip, void *_p)
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class java::lang::Throwable;
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// Unwind the stack to the point at which the signal was generated and
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// then throw an exception. With the dwarf2 unwinder we don't usually
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// need to do anything, with some minor exceptions.
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#ifdef __alpha__
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#define MAKE_THROW_FRAME(_exception) \
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do \
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{ \
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/* Alpha either leaves PC pointing at a faulting instruction or the \
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following instruction, depending on the signal. SEGV always does \
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the former, so we adjust the saved PC to point to the following \
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instruction; this is what the handler in libgcc expects. */ \
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struct sigcontext *_sc = (struct sigcontext *)_p; \
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_sc->sc_pc += 4; \
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} \
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while (0)
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#elif defined(__ia64__)
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#define MAKE_THROW_FRAME(_exception) \
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do \
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{ \
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/* IA-64 either leaves PC pointing at a faulting instruction or the \
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following instruction, depending on the signal. SEGV always does \
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the former, so we adjust the saved PC to point to the following \
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instruction; this is what the handler in libgcc expects. */ \
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/* Note that we are lying to the unwinder here, which expects the \
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faulting pc, not pc+1. But we claim the unwind information can't \
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be changed by such a ld or st instruction, so it doesn't matter. */ \
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struct sigcontext *_sc = (struct sigcontext *)_p; \
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_sc->sc_ip++; \
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} \
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while (0)
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#elif defined(__sparc__)
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/* We could do the unwind of the signal frame quickly by hand here like
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sparc-signal.h does under Solaris, but that makes debugging unwind
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failures almost impossible. */
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#if !defined(__arch64__)
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#define MAKE_THROW_FRAME(_exception) \
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do \
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{ \
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/* Sparc-32 leaves PC pointing at a faulting instruction \
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always. \
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We advance the PC one instruction past the exception causing PC. \
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This is done because FDEs are found with "context->ra - 1" in the \
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unwinder. \
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Also, the dwarf2 unwind machinery is going to add 8 to the \
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PC it uses on Sparc. So we adjust the PC here. We do it here \
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because we run once for such an exception, however the Sparc specific\
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unwind can run multiple times for the same exception and it would \
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adjust the PC more than once resulting in a bogus value. */ \
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struct sig_regs { \
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unsigned int psr, pc, npc, y, u_regs[16]; \
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} *regp; \
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unsigned int insn; \
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__asm__ __volatile__("ld [%%i7 + 8], %0" : "=r" (insn)); \
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/* mov __NR_sigaction, %g1; Old signal stack layout */ \
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if (insn == 0x821020d8) \
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regp = (struct sig_regs *) _sip; \
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else \
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/* mov __NR_rt_sigaction, %g1; New signal stack layout */ \
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regp = (struct sig_regs *) (_sip + 1); \
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regp->pc = ((regp->pc + 4) - 8); \
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} \
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while (0)
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#else
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#define MAKE_THROW_FRAME(_exception) \
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do \
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{ \
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/* Sparc-64 leaves PC pointing at a faulting instruction \
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always. \
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We advance the PC one instruction past the exception causing PC. \
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This is done because FDEs are found with "context->ra - 1" in the \
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unwinder. \
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Also, the dwarf2 unwind machinery is going to add 8 to the \
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PC it uses on Sparc. So we adjust the PC here. We do it here \
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because we run once for such an exception, however the Sparc specific\
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unwind can run multiple times for the same exception and it would \
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adjust the PC more than once resulting in a bogus value. */ \
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struct pt_regs { \
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unsigned long u_regs[16]; \
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unsigned long tstate, tpc, tnpc; \
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unsigned int y, fprs; \
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} *regp = (struct pt_regs *) (_sip + 1); \
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regp->tpc = ((regp->tpc + 4) - 8); \
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} \
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while (0)
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#endif
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#else
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#define MAKE_THROW_FRAME(_exception) \
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do \
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{ \
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(void)_p; \
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} \
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while (0)
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#endif
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#if defined(__sparc__)
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#if defined(__arch64__)
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extern "C" {
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static void __rt_sigreturn_stub(void)
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{
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__asm__("mov %0, %%g1\n\t"
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"ta 0x6d\n\t"
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: /* no outputs */
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: "i" (__NR_rt_sigreturn));
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}
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struct kernel_sigaction
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{
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void (*k_sa_sigaction)(int,siginfo_t *,void *);
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unsigned long k_sa_flags;
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void (*k_sa_restorer)(void);
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sigset_t k_sa_mask;
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};
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}
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#define INIT_SEGV \
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do \
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{ \
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nullp = new java::lang::NullPointerException (); \
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struct kernel_sigaction act; \
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unsigned long stub = ((unsigned long)&__rt_sigreturn_stub); \
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act.k_sa_sigaction = _Jv_catch_segv; \
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sigemptyset (&act.k_sa_mask); \
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act.k_sa_flags = SA_SIGINFO; \
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act.k_sa_restorer = NULL; \
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syscall (SYS_rt_sigaction, SIGSEGV, &act, NULL, \
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stub - 8, _NSIG / 8); \
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} \
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while (0)
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#define INIT_FPE \
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do \
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{ \
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arithexception = new java::lang::ArithmeticException \
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(JvNewStringLatin1 ("/ by zero")); \
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struct kernel_sigaction act; \
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unsigned long stub = ((unsigned long)&__rt_sigreturn_stub); \
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act.k_sa_sigaction = _Jv_catch_fpe; \
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sigemptyset (&act.k_sa_mask); \
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act.k_sa_flags = SA_SIGINFO; \
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act.k_sa_restorer = NULL; \
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syscall (SYS_rt_sigaction, SIGFPE, &act, NULL, \
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stub - 8, _NSIG / 8); \
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} \
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while (0)
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#else /* __arch64__ */
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extern "C" {
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struct kernel_sigaction
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{
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void (*k_sa_sigaction)(int,siginfo_t *,void *);
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unsigned long k_sa_mask, k_sa_flags;
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void (*k_sa_restorer)(void);
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};
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}
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#define INIT_SEGV \
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do \
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{ \
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struct kernel_sigaction act; \
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nullp = new java::lang::NullPointerException (); \
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act.k_sa_sigaction = _Jv_catch_segv; \
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act.k_sa_mask = 0; \
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act.k_sa_flags = SA_SIGINFO; \
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act.k_sa_restorer = NULL; \
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syscall (SYS_sigaction, -SIGSEGV, &act, NULL); \
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} \
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while (0)
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#define INIT_FPE \
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do \
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{ \
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arithexception = new java::lang::ArithmeticException \
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(JvNewStringLatin1 ("/ by zero")); \
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struct kernel_sigaction act; \
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act.k_sa_sigaction = _Jv_catch_fpe; \
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act.k_sa_mask = 0; \
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act.k_sa_flags = SA_SIGINFO; \
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act.k_sa_restorer = NULL; \
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syscall (SYS_sigaction, -SIGFPE, &act, NULL); \
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} \
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while (0)
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#endif
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#elif !defined(__ia64__)
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#define INIT_SEGV \
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do \
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{ \
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nullp = new java::lang::NullPointerException (); \
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struct sigaction act; \
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act.sa_sigaction = _Jv_catch_segv; \
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sigemptyset (&act.sa_mask); \
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act.sa_flags = SA_SIGINFO; \
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syscall (SYS_sigaction, SIGSEGV, &act, NULL); \
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} \
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while (0)
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#define INIT_FPE \
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do \
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{ \
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arithexception = new java::lang::ArithmeticException \
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(JvNewStringLatin1 ("/ by zero")); \
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struct sigaction act; \
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act.sa_sigaction = _Jv_catch_fpe; \
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sigemptyset (&act.sa_mask); \
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act.sa_flags = SA_SIGINFO; \
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syscall (SYS_sigaction, SIGFPE, &act, NULL); \
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} \
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while (0)
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/* We use syscall(SYS_sigaction) in INIT_SEGV and INIT_FPE instead of
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* sigaction() because on some systems the pthreads wrappers for
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* signal handlers are not compiled with unwind information, so it's
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* not possible to unwind through them. This is a problem that will
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* go away once all systems have pthreads libraries that are
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* compiled with full unwind info. */
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#else /* __ia64__ */
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// On IA64, unwind information is mandatory, so we can unwind
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// correctly through glibc frames. Thus we call the ordinary
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// sigaction.
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#define INIT_SEGV \
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do \
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{ \
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nullp = new java::lang::NullPointerException (); \
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struct sigaction act; \
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act.sa_sigaction = _Jv_catch_segv; \
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sigemptyset (&act.sa_mask); \
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act.sa_flags = SA_SIGINFO; \
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sigaction (SIGSEGV, &act, NULL); \
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} \
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while (0)
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#define INIT_FPE \
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do \
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{ \
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arithexception = new java::lang::ArithmeticException \
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(JvNewStringLatin1 ("/ by zero")); \
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struct sigaction act; \
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act.sa_sigaction = _Jv_catch_fpe; \
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sigemptyset (&act.sa_mask); \
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act.sa_flags = SA_SIGINFO; \
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sigaction (SIGFPE, &act, NULL); \
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} \
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while (0)
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#endif /* __ia64__ || __sparc__ */
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#endif /* JAVA_SIGNAL_H */
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