openrisc_stub.h

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//========================================================================
//
//      openrisc_stub.h
//
//      OpenRISC-specific definitions for remote debugging via gdb
//
//========================================================================
//####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
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// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
//
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// or inline functions from this file, or you compile this file and link it
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//####ECOSGPLCOPYRIGHTEND####
//========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s):   sfurman
// Contributors:Red Hat, nickg, dmoseley
// Date:        2003-02-18
// Purpose:     OpenRISC-specific definitions for gdb stubs support
//              
//
//####DESCRIPTIONEND####
//
//=============================================================================

#ifndef CYGONCE_HAL_OPENRISC_STUB_H
#define CYGONCE_HAL_OPENRISC_STUB_H

#include <pkgconf/system.h>
#include <pkgconf/hal.h>

#ifdef CYGPKG_IO_SERIAL
#include <pkgconf/io_serial.h>
#endif

#include <cyg/hal/hal_diag.h>

#ifdef CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS

#include <cyg/infra/cyg_type.h>         // CYG_UNUSED_PARAM, externC

#define HAL_STUB_PLATFORM_INIT_SERIAL()       HAL_DIAG_INIT()

#define HAL_STUB_PLATFORM_GET_CHAR()                                        \
((cyg_int8)({                                                               \
    cyg_int8 _ch_;                                                          \
    HAL_DIAG_READ_CHAR(_ch_);                                               \
    _ch_;                                                                   \
}))

#define HAL_STUB_PLATFORM_PUT_CHAR(c)         HAL_DIAG_WRITE_CHAR((c))

#define HAL_STUB_PLATFORM_SET_BAUD_RATE(baud) CYG_UNUSED_PARAM(int,(baud))

#define HAL_STUB_PLATFORM_RESET()             HAL_DIAG_INIT()

#define HAL_STUB_PLATFORM_INIT()              HAL_DIAG_INIT()

#endif // ifdef CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS

// 32 GPRs + 32 VFRs + PC reg + SR reg
#define NUMREGS 66

// VFR regs are unimplemented so they are 0 bytes in length
#define REGSIZE( _x_ ) ((((_x_) <= R31) || ((_x_) > VFR31)) ? 4 : 0)

typedef unsigned long target_register_t;

enum regnames {
     R0,   SP,   R2,   R3,   R4,   R5,   R6,   R7,
     R8,   R9,  R10,  R11,  R12,  R13,  R14,  R15,
    R16,  R17,  R18,  R19,  R20,  R21,  R22,  R23,
    R24,  R25,  R26,  R27,  R28,  R29,  R30,  R31,


     // Vector/Float registers, which are as yet unimplemented,
     // but defined in the or32 gdb back-end.

    VFR0,  VFR1,  VFR2,  VFR3,  VFR4,  VFR5,  VFR6,  VFR7,
    VFR8,  VFR9, VFR10, VFR11, VFR12, VFR13, VFR14, VFR15,
   VFR16, VFR17, VFR18, VFR19, VFR20, VFR21, VFR22, VFR23,
   VFR24, VFR25, VFR26, VFR27, VFR28, VFR29, VFR30, VFR31,

     // Special-purpose registers
      PC,    SR
};

typedef enum regnames regnames_t;

// Override generic stubs get_register() and use arch-specific version
#define CYGARC_STUB_REGISTER_ACCESS_DEFINED

#if defined(CYGDBG_HAL_DEBUG_GDB_CTRLC_SUPPORT) || defined(CYGDBG_HAL_DEBUG_GDB_BREAK_SUPPORT)
#define HAL_GET_PROFILE_INFO( _thepc_, _thesp_ )                \
    CYG_MACRO_START                                             \
    extern HAL_SavedRegisters *hal_saved_interrupt_state;       \
    if ( hal_saved_interrupt_state ) {                          \
        (_thepc_) = (char *)(hal_saved_interrupt_state->pc);    \
        (_thesp_) = (char *)(hal_saved_interrupt_state->sp);    \
    }                                                           \
    CYG_MACRO_END
#endif

/* Given a trap value TRAP, return the corresponding signal. */
externC int __computeSignal (unsigned int trap_number);

/* Return the trap number corresponding to the last-taken trap. */
externC int __get_trap_number (void);

/* Return the currently-saved value corresponding to register REG. */
externC target_register_t get_register (regnames_t reg);

/* Store VALUE in the register corresponding to WHICH. */
externC void put_register (regnames_t which, target_register_t value);

/* Set the currently-saved pc register value to PC. This also updates NPC
   as needed. */
externC void set_pc (target_register_t pc);

/* 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. */
externC void __single_step (void);

/* Clear the single-step state. */
externC void __clear_single_step (void);

/* If the breakpoint we hit is in the breakpoint() instruction, return a
   non-zero value. */
externC int __is_breakpoint_function (void);

/* Skip the current instruction. */
externC void __skipinst (void);

externC void __install_breakpoints (void);

externC void __clear_breakpoints (void);

#endif // ifndef CYGONCE_HAL_OPENRISC_STUB_H

// EOF openrisc_stub.h