source: trunk/softs/tests_cc_vcache/test_exception_epc_modify/test.S @ 520

/*
 * Check that on return from exception the modified EPC is handled.
 * We use a load to an unaligned address to trigger the exception.
 */
#include <registers.h>
#include <misc.h>

        .text
        .globl  _start
_start:
        .set noreorder
        la      k0, TTY_BASE
        la      k1, EXIT_BASE

        PRINT(startstr)

        /* reset cop0 status (keep BEV) */
        lui     a0, 0x0040;
        mtc0    a0, COP0_STATUS

        li      a0, 1
        lw      a0, 0(a0) /* fault */

        /* we shouldn't get there */
        EXIT(1)

        .globl exret

exret:
        PRINT(eretstr)
        EXIT(0)

        .globl excep
excep:
        .set noreorder
        PRINT(statusstr)
        mfc0    a0, COP0_STATUS
        PRINTX

        PRINT(causestr)
        mfc0    a0, COP0_CAUSE
        PRINTX

        PRINT(pcstr)
        mfc0    a0, COP0_EXPC
        PRINTX

        PRINT(badvastr)
        mfc0    a0, COP_0_BADVADDR
        PRINTX

        PUTCHAR('\n')
        la      a0, exret
        mtc0    a0, COP0_EXPC
        eret

        .rodata:
statusstr: .ascii "status \0"
causestr: .ascii " cause \0"
pcstr: .ascii " pc \0"
badvastr: .ascii " badva \0"
startstr: .ascii "start\n\0"
eretstr: .ascii "eret\n\0"

        .org EXCEP_ADDRESS - BOOT_ADDRESS
        .globl evect
evect:
        j       excep
        nop
        .data
myvar:  .word 0