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[/] [openrisc/] [trunk/] [rtos/] [ecos-2.0/] [packages/] [hal/] [m68k/] [arch/] [v2_0/] [src/] [m68k_stub.c] - Rev 27
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//======================================================================== // // m68k_stub.c // // Helper functions for stub // //======================================================================== //####ECOSGPLCOPYRIGHTBEGIN#### // ------------------------------------------- // This file is part of eCos, the Embedded Configurable Operating System. // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc. // // eCos is free software; you can redistribute it and/or modify it under // the terms of the GNU General Public License as published by the Free // Software Foundation; either version 2 or (at your option) any later version. // // eCos is distributed in the hope that it will be useful, but WITHOUT ANY // WARRANTY; without even the implied warranty of MERCHANTABILITY or // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License // for more details. // // You should have received a copy of the GNU General Public License along // with eCos; if not, write to the Free Software Foundation, Inc., // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. // // As a special exception, if other files instantiate templates or use macros // or inline functions from this file, or you compile this file and link it // with other works to produce a work based on this file, this file does not // by itself cause the resulting work to be covered by the GNU General Public // License. However the source code for this file must still be made available // in accordance with section (3) of the GNU General Public License. // // This exception does not invalidate any other reasons why a work based on // this file might be covered by the GNU General Public License. // // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc. // at http://sources.redhat.com/ecos/ecos-license/ // ------------------------------------------- //####ECOSGPLCOPYRIGHTEND#### //======================================================================== #include <stddef.h> #include <pkgconf/hal.h> #ifdef CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS #include <cyg/hal/hal_stub.h> #include <cyg/hal/hal_stub.h> #include <cyg/hal/hal_arch.h> #include <cyg/hal/hal_intr.h> #ifdef CYGDBG_HAL_DEBUG_GDB_THREAD_SUPPORT #include <cyg/hal/dbg-threads-api.h> // dbg_currthread_id #endif /* Given a trap value TRAP, return the corresponding signal. */ int __computeSignal (unsigned int trap_number) { switch (trap_number) { case CYGNUM_HAL_VECTOR_BUSERR: case CYGNUM_HAL_VECTOR_ADDERR: return SIGBUS; case CYGNUM_HAL_VECTOR_ILLINST: return SIGILL; case CYGNUM_HAL_VECTOR_ZERODIV: /* This isn't quite accurate: this is integer division only. */ return SIGFPE; case CYGNUM_HAL_VECTOR_CHKINST: case CYGNUM_HAL_VECTOR_TRAPVINST: return SIGTRAP; case CYGNUM_HAL_VECTOR_PRIVVIOLATION: return SIGILL; case CYGNUM_HAL_VECTOR_TRACE: /* Instruction trace */ return SIGTRAP; case CYGNUM_HAL_VECTOR_L1010: case CYGNUM_HAL_VECTOR_L1111: case CYGNUM_HAL_VECTOR_UNINITINT: case CYGNUM_HAL_VECTOR_SPURINT: return SIGTRAP; case CYGNUM_HAL_VECTOR_TRAPFIRST ... CYGNUM_HAL_VECTOR_TRAPLAST: return SIGTRAP; case CYGNUM_HAL_VECTOR_AUTOVEC1 ... CYGNUM_HAL_VECTOR_AUTOVEC7: case CYGNUM_HAL_VECTOR_INTRFIRST ... CYGNUM_HAL_VECTOR_INTRLAST: /* External interrupt */ return SIGINT; default: return SIGTERM; } } /* Return the trap number corresponding to the last-taken trap. */ int __get_trap_number (void) { //extern int hal_m68k_trap_number; // The vector is not not part of the GDB register set so get it // directly from the save context. //return hal_m68k_trap_number; return 1; } /* Set the currently-saved pc register value to PC. This also updates NPC as needed. */ void set_pc (target_register_t pc) { put_register (PC, pc); } /*---------------------------------------------------------------------- * Single-step support */ /* Set things up so that the next user resume will execute one instruction. This may be done by setting breakpoints or setting a single step flag in the saved user registers, for example. */ #define SR_TRACE 0x8000 void __single_step (void) { target_register_t sr = get_register (PS); // Set trace flag in the exception context. sr |= SR_TRACE; put_register (PS, sr); } /* Clear the single-step state. */ void __clear_single_step (void) { target_register_t sr = get_register (PS); // Clear single-step flag in the exception context. sr &= ~SR_TRACE; put_register (PS, sr); } void __install_breakpoints (void) { /* NOP since single-step HW exceptions are used instead of breakpoints. */ } void __clear_breakpoints (void) { } /* If the breakpoint we hit is in the breakpoint() instruction, return a non-zero value. */ int __is_breakpoint_function () { return get_register (PC) == (target_register_t)&CYG_LABEL_NAME(breakinst); } /* Skip the current instruction. Since this is only called by the stub when the PC points to a breakpoint or trap instruction, we can safely just skip 4. */ void __skipinst (void) { put_register (PC, get_register (PC) + 4); } #endif // CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS
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