source: soft/giet_vm/giet_kernel/exc_handler.c @ 439

///////////////////////////////////////////////////////////////////////////////////
// File     : exc_handler.c
// Date     : 01/04/2012
// Author   : alain greiner and joel porquet
// Copyright (c) UPMC-LIP6
///////////////////////////////////////////////////////////////////////////////////
// The exc_handler.c and exc_handler.h files are part of the GIET nano-kernel.
// They contains the exception handler code.
///////////////////////////////////////////////////////////////////////////////////

#include <exc_handler.h>
#include <ctx_handler.h>
#include <sys_handler.h>
#include <tty_driver.h>
#include <utils.h>

///////////////////////////////////////////////////////////////////////////////////
// Prototypes of exception handlers.
///////////////////////////////////////////////////////////////////////////////////

static void _cause_ukn();
static void _cause_adel();
static void _cause_ades();
static void _cause_ibe();
static void _cause_dbe();
static void _cause_bp();
static void _cause_ri();
static void _cause_cpu();
static void _cause_ovf();

extern void _int_handler();
extern void _sys_handler();

///////////////////////////////////////////////////////////////////////////////////
// Initialize the exception vector indexed by the CR XCODE field
///////////////////////////////////////////////////////////////////////////////////
const _exc_func_t _cause_vector[16] = 
{
    &_int_handler,  /* 0000 : external interrupt */
    &_cause_ukn,    /* 0001 : undefined exception */
    &_cause_ukn,    /* 0010 : undefined exception */
    &_cause_ukn,    /* 0011 : undefined exception */
    &_cause_adel,   /* 0100 : illegal address read exception */
    &_cause_ades,   /* 0101 : illegal address write exception */
    &_cause_ibe,    /* 0110 : instruction bus error exception */
    &_cause_dbe,    /* 0111 : data bus error exception */
    &_sys_handler,  /* 1000 : system call */
    &_cause_bp,     /* 1001 : breakpoint exception */
    &_cause_ri,     /* 1010 : illegal codop exception */
    &_cause_cpu,    /* 1011 : illegal coprocessor access */
    &_cause_ovf,    /* 1100 : arithmetic overflow exception */
    &_cause_ukn,    /* 1101 : undefined exception */
    &_cause_ukn,    /* 1110 : undefined exception */
    &_cause_ukn,    /* 1111 : undefined exception */
};

static const char * exc_type[] = 
{
    "strange unknown cause",
    "illegal read address",
    "illegal write address",
    "inst bus error",
    "data bus error",
    "breakpoint",
    "reserved instruction",
    "illegal coproc access",
    "arithmetic overflow",
};

///////////////////////////////////////////////
static void _display_cause( unsigned int type ) 
{
    unsigned int gpid       = _get_procid();
    unsigned int cluster_xy = gpid >> P_WIDTH;
    unsigned int x          = cluster_xy >> Y_WIDTH;
    unsigned int y          = cluster_xy & ((1<<Y_WIDTH)-1);
    unsigned int lpid       = gpid & ((1<<P_WIDTH)-1);

    unsigned int task       = _get_context_slot(CTX_LTID_ID);

    _printf("\n[GIET] Exception for task %d on processor[%d,%d,%d] at cycle %d\n"
            " - type      : %s\n"
            " - EPC       : %x\n"
            " - BVAR      : %x\n"
            "...Task desactivated\n",
            task, x, y, lpid, _get_proctime(),
            exc_type[type], _get_epc(), _get_bvar() );

    // goes to sleeping state
    _set_context_slot(CTX_RUN_ID, 0);

    // deschedule
    _ctx_switch();
}

static void _cause_ukn()  { _display_cause(0); }
static void _cause_adel() { _display_cause(1); }
static void _cause_ades() { _display_cause(2); }
static void _cause_ibe()  { _display_cause(3); }
static void _cause_dbe()  { _display_cause(4); }
static void _cause_bp()   { _display_cause(5); }
static void _cause_ri()   { _display_cause(6); }
static void _cause_cpu()  { _display_cause(7); }
static void _cause_ovf()  { _display_cause(8); }

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