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//========================================================================
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//
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// siginit.cxx
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//
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// ISO C and POSIX 1003.1 signals implementation
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//
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//========================================================================
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//####ECOSGPLCOPYRIGHTBEGIN####
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// -------------------------------------------
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// This file is part of eCos, the Embedded Configurable Operating System.
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// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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//
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// eCos is free software; you can redistribute it and/or modify it under
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// the terms of the GNU General Public License as published by the Free
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// Software Foundation; either version 2 or (at your option) any later version.
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//
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// eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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// WARRANTY; without even the implied warranty of MERCHANTABILITY or
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// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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// for more details.
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//
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// You should have received a copy of the GNU General Public License along
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// with eCos; if not, write to the Free Software Foundation, Inc.,
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// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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//
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// As a special exception, if other files instantiate templates or use macros
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// or inline functions from this file, or you compile this file and link it
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// with other works to produce a work based on this file, this file does not
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// by itself cause the resulting work to be covered by the GNU General Public
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// License. However the source code for this file must still be made available
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// in accordance with section (3) of the GNU General Public License.
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//
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// This exception does not invalidate any other reasons why a work based on
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// this file might be covered by the GNU General Public License.
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//
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// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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// at http://sources.redhat.com/ecos/ecos-license/
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// -------------------------------------------
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//####ECOSGPLCOPYRIGHTEND####
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//========================================================================
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//#####DESCRIPTIONBEGIN####
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//
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// Author(s): jlarmour
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// Contributors:
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// Date: 2000-04-18
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// Purpose: Provide implementation of ISO C and POSIX 1003.1 signals
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// Description: This file initializes all hardware exceptions,
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// initializes the signal handler table and provides the
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// default action function for signals
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// Usage:
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//
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//####DESCRIPTIONEND####
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//
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//========================================================================
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// CONFIGURATION
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#include <pkgconf/libc_signals.h> // libc signals configuration
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// INCLUDES
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#include <cyg/infra/cyg_type.h> // Common type definitions and support
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#include <signal.h> // Main signals definitions
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#include <cyg/infra/cyg_ass.h> // Assertion infrastructure
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#include <cyg/infra/cyg_trac.h> // Tracing infrastructure
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#include <stdlib.h> // exit()
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#ifdef CYGSEM_LIBC_SIGNALS_HWEXCEPTIONS
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# include <pkgconf/kernel.h> // required for kernel includes
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# include <cyg/kernel/except.hxx> // Kernel exception API
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# include <cyg/kernel/thread.hxx> // Cyg_Thread::self()
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# include <cyg/kernel/thread.inl> // inline definitions for above
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# include <cyg/kernel/intr.hxx> // Interrupt enable
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# include <cyg/hal/hal_intr.h> // HAL interrupt control
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#endif
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#ifdef CYGSEM_LIBC_SIGNALS_THREAD_SAFE
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# include <pkgconf/kernel.h> // required for kernel includes
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# include <cyg/kernel/mutex.hxx>
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#endif
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// TYPE DEFINITIONS
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// define dummy class to allow initialization of cyg_libc_signal_handlers
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class Cyg_libc_signals_dummy_init_class {
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public:
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Cyg_libc_signals_dummy_init_class();
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};
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#ifdef CYGSEM_LIBC_SIGNALS_HWEXCEPTIONS
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struct exception_signal_mapping_t {
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cyg_code exception;
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int signal;
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};
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// EXTERNS
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extern cyg_exception_handler cyg_null_exception_handler;
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#endif // ifdef CYGSEM_LIBC_SIGNALS_HWEXCEPTIONS
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// GLOBALS
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// main signal handlers
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__sighandler_t cyg_libc_signal_handlers[CYGNUM_LIBC_SIGNALS];
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#ifdef CYGSEM_LIBC_SIGNALS_THREAD_SAFE
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Cyg_Mutex cyg_libc_signal_handlers_mutex CYG_INIT_PRIORITY(LIBC);
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#endif
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// STATICS
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// dummy object to invoke constructor
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static Cyg_libc_signals_dummy_init_class
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cyg_libc_signals_dummy_init_obj CYG_INIT_PRIORITY(LIBC);
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#ifdef CYGSEM_LIBC_SIGNALS_HWEXCEPTIONS
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# ifdef CYGDBG_USE_TRACING
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static cyg_uint8 cyg_libc_signals_hwhandler_trace_level =
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CYGNUM_LIBC_SIGNALS_HWHANDLER_TRACE_LEVEL;
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# define TL1 (0 < cyg_libc_signals_hwhandler_trace_level)
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# endif
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# ifdef CYGSEM_LIBC_SIGNALS_CHAIN_HWEXCEPTIONS
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// old exception info so we can chain
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// FIXME: consider malloced linked list config option
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static struct {
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cyg_exception_handler *old_handler;
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CYG_ADDRWORD old_data;
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} exception_chain_data[CYGNUM_HAL_EXCEPTION_COUNT];
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# endif
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// struct that maps exceptions to signals
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static const struct exception_signal_mapping_t
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exception_signal_mapping[] = {
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#ifdef CYGNUM_HAL_EXCEPTION_DATA_ACCESS
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{CYGNUM_HAL_EXCEPTION_DATA_ACCESS, SIGBUS},
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#endif
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#ifdef CYGNUM_HAL_EXCEPTION_DATA_WRITE
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{CYGNUM_HAL_EXCEPTION_DATA_WRITE, SIGBUS},
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#endif
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#ifdef CYGNUM_HAL_EXCEPTION_CODE_ACCESS
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{CYGNUM_HAL_EXCEPTION_CODE_ACCESS, SIGBUS},
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#endif
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#ifdef CYGNUM_HAL_EXCEPTION_CODE_WRITE
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{CYGNUM_HAL_EXCEPTION_CODE_WRITE, SIGBUS},
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#endif
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#ifdef CYGNUM_HAL_EXCEPTION_CODE_EXECUTE
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{CYGNUM_HAL_EXCEPTION_CODE_EXECUTE, SIGBUS},
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#endif
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#ifdef CYGNUM_HAL_EXCEPTION_IO_ACCESS
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{CYGNUM_HAL_EXCEPTION_IO_ACCESS, SIGBUS},
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#endif
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#ifdef CYGNUM_HAL_EXCEPTION_IO_WRITE
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{CYGNUM_HAL_EXCEPTION_IO_ACCESS, SIGBUS},
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#endif
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#ifdef CYGNUM_HAL_EXCEPTION_DATA_TLBMISS_ACCESS
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{CYGNUM_HAL_EXCEPTION_DATA_TLBMISS_ACCESS, SIGSEGV},
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#endif
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#ifdef CYGNUM_HAL_EXCEPTION_DATA_TLBMISS_WRITE
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{CYGNUM_HAL_EXCEPTION_DATA_TLBMISS_WRITE, SIGSEGV},
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#endif
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#ifdef CYGNUM_HAL_EXCEPTION_CODE_TLBMISS_ACCESS
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{CYGNUM_HAL_EXCEPTION_CODE_TLBMISS_ACCESS, SIGSEGV},
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#endif
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#ifdef CYGNUM_HAL_EXCEPTION_CODE_TLBMISS_WRITE
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{CYGNUM_HAL_EXCEPTION_CODE_TLBMISS_WRITE, SIGSEGV},
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#endif
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#ifdef CYGNUM_HAL_EXCEPTION_DATA_TLBERROR_ACCESS
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{CYGNUM_HAL_EXCEPTION_DATA_TLBERROR_ACCESS, SIGSEGV},
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#endif
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#ifdef CYGNUM_HAL_EXCEPTION_DATA_TLBERROR_WRITE
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{CYGNUM_HAL_EXCEPTION_DATA_TLBERROR_WRITE, SIGSEGV},
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#endif
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#ifdef CYGNUM_HAL_EXCEPTION_CODE_TLBERROR_ACCESS
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{CYGNUM_HAL_EXCEPTION_CODE_TLBERROR_ACCESS, SIGSEGV},
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#endif
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#ifdef CYGNUM_HAL_EXCEPTION_CODE_TLBERROR_WRITE
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{CYGNUM_HAL_EXCEPTION_CODE_TLBERROR_WRITE, SIGSEGV},
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#endif
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#ifdef CYGNUM_HAL_EXCEPTION_DATA_UNALIGNED_ACCESS
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{CYGNUM_HAL_EXCEPTION_DATA_UNALIGNED_ACCESS, SIGBUS},
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#endif
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#ifdef CYGNUM_HAL_EXCEPTION_DATA_UNALIGNED_WRITE
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{CYGNUM_HAL_EXCEPTION_DATA_UNALIGNED_WRITE, SIGBUS},
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#endif
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#ifdef CYGNUM_HAL_EXCEPTION_IO_UNALIGNED_ACCESS
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{CYGNUM_HAL_EXCEPTION_IO_UNALIGNED_ACCESS, SIGBUS},
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#endif
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#ifdef CYGNUM_HAL_EXCEPTION_IO_UNALIGNED_WRITE
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{CYGNUM_HAL_EXCEPTION_IO_UNALIGNED_WRITE, SIGBUS},
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#endif
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#ifdef CYGNUM_HAL_EXCEPTION_ILLEGAL_INSTRUCTION
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{CYGNUM_HAL_EXCEPTION_ILLEGAL_INSTRUCTION, SIGILL},
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#endif
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#ifdef CYGNUM_HAL_EXCEPTION_INTERRUPT
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{CYGNUM_HAL_EXCEPTION_INTERRUPT, SIGINT},
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#endif
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#ifdef CYGNUM_HAL_EXCEPTION_TRAP
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{CYGNUM_HAL_EXCEPTION_TRAP, SIGTRAP},
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#endif
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#ifdef CYGNUM_HAL_EXCEPTION_DIV_BY_ZERO
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{CYGNUM_HAL_EXCEPTION_DIV_BY_ZERO, SIGFPE},
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#endif
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#ifdef CYGNUM_HAL_EXCEPTION_OVERFLOW
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{CYGNUM_HAL_EXCEPTION_OVERFLOW, SIGFPE},
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#endif
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#ifdef CYGNUM_HAL_EXCEPTION_BOUNDS
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{CYGNUM_HAL_EXCEPTION_BOUNDS, SIGSEGV},
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#endif
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| 215 |
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#ifdef CYGNUM_HAL_EXCEPTION_SINGLE_STEP
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| 216 |
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{CYGNUM_HAL_EXCEPTION_SINGLE_STEP, SIGTRAP},
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#endif
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| 218 |
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#ifdef CYGNUM_HAL_EXCEPTION_INSTRUCTION_BP
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| 219 |
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{CYGNUM_HAL_EXCEPTION_INSTRUCTION_BP, SIGTRAP},
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#endif
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| 221 |
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#ifdef CYGNUM_HAL_EXCEPTION_PERIPHERAL_BP
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| 222 |
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{CYGNUM_HAL_EXCEPTION_PERIPHERAL_BP, SIGTRAP},
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| 223 |
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#endif
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| 224 |
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#ifdef CYGNUM_HAL_EXCEPTION_DATA_BP
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| 225 |
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{CYGNUM_HAL_EXCEPTION_DATA_BP, SIGTRAP},
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| 226 |
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#endif
|
| 227 |
|
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#ifdef CYGNUM_HAL_EXCEPTION_DEVELOPMENT_BP
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| 228 |
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{CYGNUM_HAL_EXCEPTION_DEVELOPMENT_BP, SIGTRAP},
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| 229 |
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#endif
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| 230 |
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#ifdef CYGNUM_HAL_EXCEPTION_STACK_OVERFLOW
|
| 231 |
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{CYGNUM_HAL_EXCEPTION_STACK_OVERFLOW, SIGSEGV},
|
| 232 |
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#endif
|
| 233 |
|
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#ifdef CYGNUM_HAL_EXCEPTION_STACK_FAULT
|
| 234 |
|
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{CYGNUM_HAL_EXCEPTION_STACK_FAULT, SIGSEGV},
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| 235 |
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#endif
|
| 236 |
|
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#ifdef CYGNUM_HAL_EXCEPTION_PARITY
|
| 237 |
|
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{CYGNUM_HAL_EXCEPTION_PARITY, SIGBUS},
|
| 238 |
|
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#endif
|
| 239 |
|
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#ifdef CYGNUM_HAL_EXCEPTION_FPU
|
| 240 |
|
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{CYGNUM_HAL_EXCEPTION_FPU, SIGFPE},
|
| 241 |
|
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#endif
|
| 242 |
|
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#ifdef CYGNUM_HAL_EXCEPTION_FPU_NOT_AVAIL
|
| 243 |
|
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{CYGNUM_HAL_EXCEPTION_FPU_NOT_AVAIL, SIGFPE},
|
| 244 |
|
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#endif
|
| 245 |
|
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#ifdef CYGNUM_HAL_EXCEPTION_FPU_OVERFLOW
|
| 246 |
|
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{CYGNUM_HAL_EXCEPTION_FPU_OVERFLOW, SIGFPE},
|
| 247 |
|
|
#endif
|
| 248 |
|
|
#ifdef CYGNUM_HAL_EXCEPTION_FPU_UNDERFLOW
|
| 249 |
|
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{CYGNUM_HAL_EXCEPTION_FPU_UNDERFLOW, SIGFPE},
|
| 250 |
|
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#endif
|
| 251 |
|
|
#ifdef CYGNUM_HAL_EXCEPTION_FPU_DIV_BY_ZERO
|
| 252 |
|
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{CYGNUM_HAL_EXCEPTION_FPU_DIV_BY_ZERO, SIGFPE},
|
| 253 |
|
|
#endif
|
| 254 |
|
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#ifdef CYGNUM_HAL_EXCEPTION_SYSTEM_CALL
|
| 255 |
|
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{CYGNUM_HAL_EXCEPTION_SYSTEM_CALL, SIGSYS},
|
| 256 |
|
|
#endif
|
| 257 |
|
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{0, 0} // dummy value to ensure compiler is happy
|
| 258 |
|
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};
|
| 259 |
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|
| 260 |
|
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|
| 261 |
|
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// FUNCTIONS
|
| 262 |
|
|
|
| 263 |
|
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/////////////////////////////////////////
|
| 264 |
|
|
// cyg_libc_signals_hwexcept_handler() //
|
| 265 |
|
|
/////////////////////////////////////////
|
| 266 |
|
|
|
| 267 |
|
|
// FIXME: should be able to get this work with
|
| 268 |
|
|
// CYGSEM_KERNEL_EXCEPTIONS_DECODE disabled as well as enabled
|
| 269 |
|
|
static void
|
| 270 |
|
|
cyg_libc_signals_hwexcept_handler( CYG_ADDRWORD data, cyg_code exception,
|
| 271 |
|
|
CYG_ADDRWORD info)
|
| 272 |
|
|
{
|
| 273 |
|
|
int signal = (int)data;
|
| 274 |
|
|
int ret;
|
| 275 |
|
|
|
| 276 |
|
|
CYG_REPORT_FUNCNAME("cyg_libc_signals_hwexcept_handler");
|
| 277 |
|
|
|
| 278 |
|
|
CYG_REPORT_FUNCARG3( "data = %08x, exception = %d, info = %08x",
|
| 279 |
|
|
data, exception, info );
|
| 280 |
|
|
|
| 281 |
|
|
#ifdef CYGSEM_LIBC_SIGNALS_BAD_SIGNAL_FATAL
|
| 282 |
|
|
CYG_PRECONDITION((signal > 0) && (signal < CYGNUM_LIBC_SIGNALS),
|
| 283 |
|
|
"Signal number not valid!");
|
| 284 |
|
|
#endif
|
| 285 |
|
|
|
| 286 |
|
|
// chain first as it may be more useful more low-level stuff needed
|
| 287 |
|
|
#ifdef CYGSEM_LIBC_SIGNALS_CHAIN_HWEXCEPTIONS
|
| 288 |
|
|
// map exception to 0..CYGNUM_HAL_EXCEPTION_COUNT
|
| 289 |
|
|
exception -= CYGNUM_HAL_EXCEPTION_MIN;
|
| 290 |
|
|
|
| 291 |
|
|
// special case for null handler since it is only for uncaught exceptions
|
| 292 |
|
|
|
| 293 |
|
|
if (exception_chain_data[exception].old_handler !=
|
| 294 |
|
|
cyg_null_exception_handler) {
|
| 295 |
|
|
(*exception_chain_data[exception].old_handler)(
|
| 296 |
|
|
exception_chain_data[exception].old_data, exception, info);
|
| 297 |
|
|
CYG_TRACE0(TL1, "Chained exception handler returned");
|
| 298 |
|
|
} // if
|
| 299 |
|
|
#endif
|
| 300 |
|
|
|
| 301 |
|
|
#ifndef CYGSEM_LIBC_SIGNALS_BAD_SIGNAL_FATAL
|
| 302 |
|
|
// if not fatal, silently return
|
| 303 |
|
|
if ((signal <= 0) || (signal >= CYGNUM_LIBC_SIGNALS)) {
|
| 304 |
|
|
CYG_REPORT_RETURN();
|
| 305 |
|
|
return;
|
| 306 |
|
|
}
|
| 307 |
|
|
#endif
|
| 308 |
|
|
|
| 309 |
|
|
CYG_TRACE0(TL1, "Enabling interrupts");
|
| 310 |
|
|
HAL_ENABLE_INTERRUPTS();
|
| 311 |
|
|
|
| 312 |
|
|
CYG_TRACE0(TL1, "Raising signal");
|
| 313 |
|
|
ret = raise(signal);
|
| 314 |
|
|
|
| 315 |
|
|
if (ret) {
|
| 316 |
|
|
CYG_TRACE1(TL1, "raise() returned non-zero value %d!!!", ret);
|
| 317 |
|
|
} // if
|
| 318 |
|
|
|
| 319 |
|
|
CYG_REPORT_RETURN();
|
| 320 |
|
|
} // cyg_libc_signals_hwexcept_handler()
|
| 321 |
|
|
|
| 322 |
|
|
|
| 323 |
|
|
//////////////////
|
| 324 |
|
|
// reg_except() //
|
| 325 |
|
|
//////////////////
|
| 326 |
|
|
|
| 327 |
|
|
static void inline
|
| 328 |
|
|
reg_except( cyg_code exception, int signal )
|
| 329 |
|
|
{
|
| 330 |
|
|
Cyg_Thread::self()->register_exception(
|
| 331 |
|
|
exception, &cyg_libc_signals_hwexcept_handler, (CYG_ADDRWORD)signal,
|
| 332 |
|
|
#ifdef CYGSEM_LIBC_SIGNALS_CHAIN_HWEXCEPTIONS
|
| 333 |
|
|
&exception_chain_data[exception -
|
| 334 |
|
|
CYGNUM_HAL_EXCEPTION_MIN].old_handler,
|
| 335 |
|
|
&exception_chain_data[exception - CYGNUM_HAL_EXCEPTION_MIN].old_data
|
| 336 |
|
|
#else
|
| 337 |
|
|
NULL, NULL
|
| 338 |
|
|
#endif
|
| 339 |
|
|
);
|
| 340 |
|
|
|
| 341 |
|
|
} // reg_except();
|
| 342 |
|
|
|
| 343 |
|
|
#endif // ifdef CYGSEM_LIBC_SIGNALS_HWEXCEPTIONS
|
| 344 |
|
|
|
| 345 |
|
|
///////////////////////////////////////////////////
|
| 346 |
|
|
// Cyg_libc_signals_dummy_init_class constructor //
|
| 347 |
|
|
///////////////////////////////////////////////////
|
| 348 |
|
|
|
| 349 |
|
|
Cyg_libc_signals_dummy_init_class::Cyg_libc_signals_dummy_init_class()
|
| 350 |
|
|
{
|
| 351 |
|
|
cyg_ucount8 i;
|
| 352 |
|
|
|
| 353 |
|
|
CYG_REPORT_FUNCNAME("Cyg_libc_signals_dummy_init_class constructor");
|
| 354 |
|
|
|
| 355 |
|
|
// FIXME: some should be SIG_IGN?
|
| 356 |
|
|
for (i=0; i<CYGNUM_LIBC_SIGNALS; i++)
|
| 357 |
|
|
cyg_libc_signal_handlers[i] = SIG_DFL;
|
| 358 |
|
|
|
| 359 |
|
|
#ifdef CYGSEM_LIBC_SIGNALS_HWEXCEPTIONS
|
| 360 |
|
|
// go through the entire array of exceptions, _but_ subtract 1 for
|
| 361 |
|
|
// the dummy at the end
|
| 362 |
|
|
for (i=0; i < (sizeof(exception_signal_mapping) /
|
| 363 |
|
|
sizeof(exception_signal_mapping_t) - 1); i++) {
|
| 364 |
|
|
CYG_ASSERT( (exception_signal_mapping[i].exception <=
|
| 365 |
|
|
CYGNUM_HAL_EXCEPTION_MAX) &&
|
| 366 |
|
|
(exception_signal_mapping[i].exception >=
|
| 367 |
|
|
CYGNUM_HAL_EXCEPTION_MIN),
|
| 368 |
|
|
"Asked to register bad exception");
|
| 369 |
|
|
|
| 370 |
|
|
CYG_ASSERT( (exception_signal_mapping[i].signal > 0) &&
|
| 371 |
|
|
(exception_signal_mapping[i].signal <
|
| 372 |
|
|
CYGNUM_LIBC_SIGNALS), "Asked to register bad signal" );
|
| 373 |
|
|
|
| 374 |
|
|
reg_except( exception_signal_mapping[i].exception,
|
| 375 |
|
|
exception_signal_mapping[i].signal);
|
| 376 |
|
|
}
|
| 377 |
|
|
#endif
|
| 378 |
|
|
|
| 379 |
|
|
CYG_REPORT_RETURN();
|
| 380 |
|
|
} // Cyg_libc_signals_dummy_init_class() constructor
|
| 381 |
|
|
|
| 382 |
|
|
|
| 383 |
|
|
////////////////////////////////////////
|
| 384 |
|
|
// cyg_libc_signals_default_handler() //
|
| 385 |
|
|
////////////////////////////////////////
|
| 386 |
|
|
|
| 387 |
|
|
// Default signal handler - SIG_DFL
|
| 388 |
|
|
externC void
|
| 389 |
|
|
cyg_libc_signals_default_handler(int sig)
|
| 390 |
|
|
{
|
| 391 |
|
|
CYG_REPORT_FUNCNAME( "cyg_libc_signals_default_handler" );
|
| 392 |
|
|
|
| 393 |
|
|
CYG_REPORT_FUNCARG1( "signal number = %d", sig );
|
| 394 |
|
|
|
| 395 |
|
|
exit(1000 + sig); // FIXME
|
| 396 |
|
|
|
| 397 |
|
|
CYG_REPORT_RETURN();
|
| 398 |
|
|
} // cyg_libc_signals_default_handler()
|
| 399 |
|
|
|
| 400 |
|
|
#ifdef CYGSEM_LIBC_SIGNALS_THREAD_SAFE
|
| 401 |
|
|
/////////////////////////////////////
|
| 402 |
|
|
// cyg_libc_signals_lock_do_lock() //
|
| 403 |
|
|
/////////////////////////////////////
|
| 404 |
|
|
|
| 405 |
|
|
externC cyg_bool
|
| 406 |
|
|
cyg_libc_signals_lock_do_lock(void)
|
| 407 |
|
|
{
|
| 408 |
|
|
cyg_bool ret;
|
| 409 |
|
|
CYG_REPORT_FUNCNAMETYPE("cyg_libc_signals_lock_do_lock", "returning %d");
|
| 410 |
|
|
|
| 411 |
|
|
ret = cyg_libc_signal_handlers_mutex.lock();
|
| 412 |
|
|
|
| 413 |
|
|
CYG_REPORT_RETVAL(ret);
|
| 414 |
|
|
|
| 415 |
|
|
return ret;
|
| 416 |
|
|
} // cyg_libc_signals_lock_do_lock()
|
| 417 |
|
|
|
| 418 |
|
|
///////////////////////////////////////
|
| 419 |
|
|
// cyg_libc_signals_lock_do_unlock() //
|
| 420 |
|
|
///////////////////////////////////////
|
| 421 |
|
|
|
| 422 |
|
|
externC void
|
| 423 |
|
|
cyg_libc_signals_lock_do_unlock(void)
|
| 424 |
|
|
{
|
| 425 |
|
|
CYG_REPORT_FUNCNAME("cyg_libc_signals_lock_do_unlock");
|
| 426 |
|
|
|
| 427 |
|
|
cyg_libc_signal_handlers_mutex.unlock();
|
| 428 |
|
|
|
| 429 |
|
|
CYG_REPORT_RETURN();
|
| 430 |
|
|
} // cyg_libc_signals_lock_do_unlock()
|
| 431 |
|
|
|
| 432 |
|
|
#endif // ifdef CYGSEM_LIBC_SIGNALS_THREAD_SAFE
|
| 433 |
|
|
|
| 434 |
|
|
// EOF siginit.cxx
|
