LXR linux/arch/arm/kernel/debug.S

   1/*
   2 *  linux/arch/arm/kernel/debug.S
   3 *
   4 *  Copyright (C) 1994-1999 Russell King
   5 *
   6 * This program is free software; you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License version 2 as
   8 * published by the Free Software Foundation.
   9 *
  10 *  32-bit debugging code
  11 */
  12#include <linux/linkage.h>
  13
  14                .text
  15
  16/*
  17 * Some debugging routines (useful if you've got MM problems and
  18 * printk isn't working).  For DEBUGGING ONLY!!!  Do not leave
  19 * references to these in a production kernel!
  20 */
  21
  22#if defined(CONFIG_DEBUG_ICEDCC)
  23                @@ debug using ARM EmbeddedICE DCC channel
  24
  25#if defined(CONFIG_CPU_V6)
  26
  27                .macro  addruart, rx
  28                .endm
  29
  30                .macro  senduart, rd, rx
  31                mcr     p14, 0, \rd, c0, c5, 0
  32                .endm
  33
  34                .macro  busyuart, rd, rx
  351001:
  36                mrc     p14, 0, \rx, c0, c1, 0
  37                tst     \rx, #0x20000000
  38                beq     1001b
  39                .endm
  40
  41                .macro  waituart, rd, rx
  42                mov     \rd, #0x2000000
  431001:
  44                subs    \rd, \rd, #1
  45                bmi     1002f
  46                mrc     p14, 0, \rx, c0, c1, 0
  47                tst     \rx, #0x20000000
  48                bne     1001b
  491002:
  50                .endm
  51
  52#else
  53
  54                .macro  addruart, rx
  55                .endm
  56
  57                .macro  senduart, rd, rx
  58                mcr     p14, 0, \rd, c1, c0, 0
  59                .endm
  60
  61                .macro  busyuart, rd, rx
  621001:
  63                mrc     p14, 0, \rx, c0, c0, 0
  64                tst     \rx, #2
  65                beq     1001b
  66
  67                .endm
  68
  69                .macro  waituart, rd, rx
  70                mov     \rd, #0x2000000
  711001:
  72                subs    \rd, \rd, #1
  73                bmi     1002f
  74                mrc     p14, 0, \rx, c0, c0, 0
  75                tst     \rx, #2
  76                bne     1001b
  771002:
  78                .endm
  79
  80#endif  /* CONFIG_CPU_V6 */
  81
  82#else
  83#include <asm/arch/debug-macro.S>
  84#endif  /* CONFIG_DEBUG_ICEDCC */
  85
  86/*
  87 * Useful debugging routines
  88 */
  89ENTRY(printhex8)
  90                mov     r1, #8
  91                b       printhex
  92
  93ENTRY(printhex4)
  94                mov     r1, #4
  95                b       printhex
  96
  97ENTRY(printhex2)
  98                mov     r1, #2
  99printhex:       adr     r2, hexbuf
 100                add     r3, r2, r1
 101                mov     r1, #0
 102                strb    r1, [r3]
 1031:              and     r1, r0, #15
 104                mov     r0, r0, lsr #4
 105                cmp     r1, #10
 106                addlt   r1, r1, #'0'
 107                addge   r1, r1, #'a' - 10
 108                strb    r1, [r3, #-1]!
 109                teq     r3, r2
 110                bne     1b
 111                mov     r0, r2
 112                b       printascii
 113
 114                .ltorg
 115
 116ENTRY(printascii)
 117                addruart r3
 118                b       2f
 1191:              waituart r2, r3
 120                senduart r1, r3
 121                busyuart r2, r3
 122                teq     r1, #'\n'
 123                moveq   r1, #'\r'
 124                beq     1b
 1252:              teq     r0, #0
 126                ldrneb  r1, [r0], #1
 127                teqne   r1, #0
 128                bne     1b
 129                mov     pc, lr
 130
 131ENTRY(printch)
 132                addruart r3
 133                mov     r1, r0
 134                mov     r0, #0
 135                b       1b
 136
 137hexbuf:         .space 16
 138