Subversion Repositories mips32r1

###############################################################################

# TITLE: Exception Vectors

# AUTHOR: Grant Ayers (ayers@cs.utah.edu)

# DATE: 23 May 2012

# FILENAME: exceptions.asm

# PROJECT: University of Utah XUM Single Core

# DESCRIPTION:

#   Provides the exception vectors which jump to

#   exception-handling routines.

#

###############################################################################

#  Current setup:

#    1. The exception vector begins at address 0x0.

#    2. The interrupt vector begins at address 0x8.

#    3. Each vector has room for 2 instructions (8 bytes) with which

#       it must jump to its demultiplexing routine. The demultiplexing

#       routine calls individual exception-specific handlers.

#    4. The linker script must ensure that this code is placed at the

#       correct address.

        .text

        .balign 4

        .ent    exception_vector

        .set    noreorder

exception_vector:

        j       mips32_general_exception

        nop

        .end    exception_vector

        .ent    interrupt_vector

interrupt_vector:

        j       mips32_interrupt_exception

        nop

        .end    interrupt_vector