arch/mn10300/kernel/gdb-low.S

   1 ###############################################################################
   2 #
   3 # MN10300 Low-level gdbstub routines
   4 #
   5 # Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
   6 # Written by David Howells (dhowells@redhat.com)
   7 #
   8 # This program is free software; you can redistribute it and/or
   9 # modify it under the terms of the GNU General Public Licence
  10 # as published by the Free Software Foundation; either version
  11 # 2 of the Licence, or (at your option) any later version.
  12 #
  13 ###############################################################################
  14 #include <linux/sys.h>
  15 #include <linux/linkage.h>
  16 #include <asm/smp.h>
  17 #include <asm/cache.h>
  18 #include <asm/cpu-regs.h>
  19 #include <asm/exceptions.h>
  20 #include <asm/frame.inc>
  21 #include <asm/serial-regs.h>
  22
  23         .text
  24
  25 ###############################################################################
  26 #
  27 # GDB stub read memory with guard
  28 # - D0 holds the memory address to read
  29 # - D1 holds the address to store the byte into
  30 #
  31 ###############################################################################
  32         .globl gdbstub_read_byte_guard
  33         .globl gdbstub_read_byte_cont
  34 ENTRY(gdbstub_read_byte)
  35         mov     d0,a0
  36         mov     d1,a1
  37         clr     d0
  38 gdbstub_read_byte_guard:
  39         movbu   (a0),d1
  40 gdbstub_read_byte_cont:
  41         movbu   d1,(a1)
  42         ret     [],0
  43
  44         .globl gdbstub_read_word_guard
  45         .globl gdbstub_read_word_cont
  46 ENTRY(gdbstub_read_word)
  47         mov     d0,a0
  48         mov     d1,a1
  49         clr     d0
  50 gdbstub_read_word_guard:
  51         movhu   (a0),d1
  52 gdbstub_read_word_cont:
  53         movhu   d1,(a1)
  54         ret     [],0
  55
  56         .globl gdbstub_read_dword_guard
  57         .globl gdbstub_read_dword_cont
  58 ENTRY(gdbstub_read_dword)
  59         mov     d0,a0
  60         mov     d1,a1
  61         clr     d0
  62 gdbstub_read_dword_guard:
  63         mov     (a0),d1
  64 gdbstub_read_dword_cont:
  65         mov     d1,(a1)
  66         ret     [],0
  67
  68 ###############################################################################
  69 #
  70 # GDB stub write memory with guard
  71 # - D0 holds the byte to store
  72 # - D1 holds the memory address to write
  73 #
  74 ###############################################################################
  75         .globl gdbstub_write_byte_guard
  76         .globl gdbstub_write_byte_cont
  77 ENTRY(gdbstub_write_byte)
  78         mov     d0,a0
  79         mov     d1,a1
  80         clr     d0
  81 gdbstub_write_byte_guard:
  82         movbu   a0,(a1)
  83 gdbstub_write_byte_cont:
  84         ret     [],0
  85
  86         .globl gdbstub_write_word_guard
  87         .globl gdbstub_write_word_cont
  88 ENTRY(gdbstub_write_word)
  89         mov     d0,a0
  90         mov     d1,a1
  91         clr     d0
  92 gdbstub_write_word_guard:
  93         movhu   a0,(a1)
  94 gdbstub_write_word_cont:
  95         ret     [],0
  96
  97         .globl gdbstub_write_dword_guard
  98         .globl gdbstub_write_dword_cont
  99 ENTRY(gdbstub_write_dword)
 100         mov     d0,a0
 101         mov     d1,a1
 102         clr     d0
 103 gdbstub_write_dword_guard:
 104         mov     a0,(a1)
 105 gdbstub_write_dword_cont:
 106         ret     [],0
 107
 108 ###############################################################################
 109 #
 110 # GDB stub BUG() trap
 111 #
 112 ###############################################################################
 113 ENTRY(__gdbstub_bug_trap)
 114         .byte   0xF7,0xF7       # don't use 0xFF as the JTAG unit preempts that
 115         ret     [],0