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//========================================================================
//
//      coldfire_stub.c
//
//      Helper functions for stub
//
//========================================================================
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//
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//========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s):     Enrico Piria
// Contributors:
// Date:          2005-25-06
// Purpose:       Helper functions for stub, generic to all ColdFire
//                processors.
//
//####DESCRIPTIONEND####
//========================================================================
 
#include <stddef.h>
#include <string.h>                     // memcpy, memset
 
#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_ADDRERR:
            return SIGBUS;
 
        case CYGNUM_HAL_VECTOR_ILLINST:
        case CYGNUM_HAL_VECTOR_UNSUPINST:
            return SIGILL;
 
        case CYGNUM_HAL_VECTOR_ZERODIV:
        case CYGNUM_HAL_VECTOR_FP_BRANCH:
        case CYGNUM_HAL_VECTOR_FP_INEXACT:
        case CYGNUM_HAL_VECTOR_FP_ZERODIV:
        case CYGNUM_HAL_VECTOR_FP_UNDERFLOW:
        case CYGNUM_HAL_VECTOR_FP_OPERAND:
        case CYGNUM_HAL_VECTOR_FP_OVERFLOW:
        case CYGNUM_HAL_VECTOR_FP_NAN:
        case CYGNUM_HAL_VECTOR_FP_DENORM:
            // Although not quite accurate, use this signal also for
            // integer division.
            return SIGFPE;
 
        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_USERINTRFIRST ... CYGNUM_HAL_VECTOR_USERINTRLAST:
            // External interrupt
            return SIGINT;
 
        default:
            return SIGTERM;
    }
}
 
 
// Return the trap number corresponding to the last-taken trap.
int __get_trap_number (void)
{
    // The vector is not not part of the GDB register set so get it
    // directly from the saved context.
    return HAL_CF_EXCEPTION_VECTOR(_hal_registers->fmt_vec_word);
}
 
 
// Set the currently-saved pc register value to PC.
void set_pc (target_register_t pc)
{
    put_register (PC, pc);
}
 
 
// Return the offset of a register in the GDB_Registers structure.
static int reg_offset(regnames_t reg)
{
    switch(reg)
    {
        case D0 ... A7:
            return reg * 4;
 
        case SR:
            return offsetof(GDB_Registers, sr);
 
        default:
        case PC:
            return offsetof(GDB_Registers, pc);
    }
}
 
 
// Return the currently-saved value corresponding to register REG of
// the exception context.
target_register_t get_register(regnames_t reg)
{
    target_register_t val;
    int offset = reg_offset(reg);
 
    if (REGSIZE(reg) > sizeof(target_register_t))
        return -1;
 
    val = _registers[offset/sizeof(target_register_t)];
 
    return val;
}
 
 
// Store VALUE in the register corresponding to WHICH in the exception
// context.
void put_register(regnames_t which, target_register_t value)
{
    int offset = reg_offset(which);
 
    if (REGSIZE(which) > sizeof(target_register_t))
        return;
 
    _registers[offset/sizeof(target_register_t)] = value;
}
 
 
// Write the contents of register WHICH into VALUE as raw bytes. This
// is only used for registers larger than sizeof(target_register_t).
// Return non-zero if it is a valid register.
int get_register_as_bytes(regnames_t which, char *value)
{
    int offset = reg_offset(which);
 
    memcpy (value, (char *)_registers + offset, REGSIZE(which));
    return 1;
}
 
 
// Alter the contents of saved register WHICH to contain VALUE. This
// is only used for registers larger than sizeof(target_register_t).
// Return non-zero if it is a valid register.
int put_register_as_bytes(regnames_t which, char *value)
{
    int offset = reg_offset(which);
 
    memcpy ((char *)_registers + offset, value, REGSIZE(which));
    return 1;
}
 
 
// ---------------------------------------------------------------------
// 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 (SR);
 
    // Set trace flag in the exception context.
    sr |= SR_TRACE;
 
    put_register (SR, sr);
}
 
 
// Clear the single-step state.
void __clear_single_step(void)
{
    target_register_t sr = get_register (SR);
 
    // Clear single-step flag in the exception context.
    sr &= ~SR_TRACE;
 
    put_register (SR, sr);
}
 
 
void __install_breakpoints(void)
{
    // NOP since single-step HW exceptions are used instead of
    // breakpoints.
}
 
 
void __clear_breakpoints(void)
{
    // NOP since single-step HW exceptions are used instead of
    // breakpoints.
}
 
 
// If the breakpoint we hit is in the breakpoint() instruction, return a
// non-zero value.
int __is_breakpoint_function(void)
{
    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 2.
void __skipinst(void)
{
    put_register (PC, get_register (PC) + HAL_BREAKINST_SIZE);
}
 
#endif // CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS