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 .macro addruart, rx, tmp 26 .endm 27 28#if defined(CONFIG_CPU_V6) 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#elif defined(CONFIG_CPU_V7) 53 54 .macro senduart, rd, rx 55 mcr p14, 0, \rd, c0, c5, 0 56 .endm 57 58 .macro busyuart, rd, rx 59busy: mrc p14, 0, pc, c0, c1, 0 60 bcs busy 61 .endm 62 63 .macro waituart, rd, rx 64wait: mrc p14, 0, pc, c0, c1, 0 65 bcs wait 66 67 .endm 68 69#elif defined(CONFIG_CPU_XSCALE) 70 71 .macro senduart, rd, rx 72 mcr p14, 0, \rd, c8, c0, 0 73 .endm 74 75 .macro busyuart, rd, rx 761001: 77 mrc p14, 0, \rx, c14, c0, 0 78 tst \rx, #0x10000000 79 beq 1001b 80 .endm 81 82 .macro waituart, rd, rx 83 mov \rd, #0x10000000 841001: 85 subs \rd, \rd, #1 86 bmi 1002f 87 mrc p14, 0, \rx, c14, c0, 0 88 tst \rx, #0x10000000 89 bne 1001b 901002: 91 .endm 92 93#else 94 95 .macro senduart, rd, rx 96 mcr p14, 0, \rd, c1, c0, 0 97 .endm 98 99 .macro busyuart, rd, rx 1001001: 101 mrc p14, 0, \rx, c0, c0, 0 102 tst \rx, #2 103 beq 1001b 104 105 .endm 106 107 .macro waituart, rd, rx 108 mov \rd, #0x2000000 1091001: 110 subs \rd, \rd, #1 111 bmi 1002f 112 mrc p14, 0, \rx, c0, c0, 0 113 tst \rx, #2 114 bne 1001b 1151002: 116 .endm 117 118#endif /* CONFIG_CPU_V6 */ 119 120#else 121#include <mach/debug-macro.S> 122#endif /* CONFIG_DEBUG_ICEDCC */ 123 124/* 125 * Useful debugging routines 126 */ 127ENTRY(printhex8) 128 mov r1, #8 129 b printhex 130ENDPROC(printhex8) 131 132ENTRY(printhex4) 133 mov r1, #4 134 b printhex 135ENDPROC(printhex4) 136 137ENTRY(printhex2) 138 mov r1, #2 139printhex: adr r2, hexbuf 140 add r3, r2, r1 141 mov r1, #0 142 strb r1, [r3] 1431: and r1, r0, #15 144 mov r0, r0, lsr #4 145 cmp r1, #10 146 addlt r1, r1, #'0' 147 addge r1, r1, #'a' - 10 148 strb r1, [r3, #-1]! 149 teq r3, r2 150 bne 1b 151 mov r0, r2 152 b printascii 153ENDPROC(printhex2) 154 155 .ltorg 156 157ENTRY(printascii) 158 addruart r3, r1 159 b 2f 1601: waituart r2, r3 161 senduart r1, r3 162 busyuart r2, r3 163 teq r1, #'\n' 164 moveq r1, #'\r' 165 beq 1b 1662: teq r0, #0 167 ldrneb r1, [r0], #1 168 teqne r1, #0 169 bne 1b 170 mov pc, lr 171ENDPROC(printascii) 172 173ENTRY(printch) 174 addruart r3, r1 175 mov r1, r0 176 mov r0, #0 177 b 1b 178ENDPROC(printch) 179 180hexbuf: .space 16 181