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#elif defined(CONFIG_CPU_XSCALE) 53 54 .macro addruart, rx 55 .endm 56 57 .macro senduart, rd, rx 58 mcr p14, 0, \rd, c8, c0, 0 59 .endm 60 61 .macro busyuart, rd, rx 621001: 63 mrc p14, 0, \rx, c14, c0, 0 64 tst \rx, #0x10000000 65 beq 1001b 66 .endm 67 68 .macro waituart, rd, rx 69 mov \rd, #0x10000000 701001: 71 subs \rd, \rd, #1 72 bmi 1002f 73 mrc p14, 0, \rx, c14, c0, 0 74 tst \rx, #0x10000000 75 bne 1001b 761002: 77 .endm 78 79#else 80 81 .macro addruart, rx 82 .endm 83 84 .macro senduart, rd, rx 85 mcr p14, 0, \rd, c1, c0, 0 86 .endm 87 88 .macro busyuart, rd, rx 891001: 90 mrc p14, 0, \rx, c0, c0, 0 91 tst \rx, #2 92 beq 1001b 93 94 .endm 95 96 .macro waituart, rd, rx 97 mov \rd, #0x2000000 981001: 99 subs \rd, \rd, #1 100 bmi 1002f 101 mrc p14, 0, \rx, c0, c0, 0 102 tst \rx, #2 103 bne 1001b 1041002: 105 .endm 106 107#endif /* CONFIG_CPU_V6 */ 108 109#else 110#include <mach/debug-macro.S> 111#endif /* CONFIG_DEBUG_ICEDCC */ 112 113/* 114 * Useful debugging routines 115 */ 116ENTRY(printhex8) 117 mov r1, #8 118 b printhex 119ENDPROC(printhex8) 120 121ENTRY(printhex4) 122 mov r1, #4 123 b printhex 124ENDPROC(printhex4) 125 126ENTRY(printhex2) 127 mov r1, #2 128printhex: adr r2, hexbuf 129 add r3, r2, r1 130 mov r1, #0 131 strb r1, [r3] 1321: and r1, r0, #15 133 mov r0, r0, lsr #4 134 cmp r1, #10 135 addlt r1, r1, #'0' 136 addge r1, r1, #'a' - 10 137 strb r1, [r3, #-1]! 138 teq r3, r2 139 bne 1b 140 mov r0, r2 141 b printascii 142ENDPROC(printhex2) 143 144 .ltorg 145 146ENTRY(printascii) 147 addruart r3 148 b 2f 1491: waituart r2, r3 150 senduart r1, r3 151 busyuart r2, r3 152 teq r1, #'\n' 153 moveq r1, #'\r' 154 beq 1b 1552: teq r0, #0 156 ldrneb r1, [r0], #1 157 teqne r1, #0 158 bne 1b 159 mov pc, lr 160ENDPROC(printascii) 161 162ENTRY(printch) 163 addruart r3 164 mov r1, r0 165 mov r0, #0 166 b 1b 167ENDPROC(printch) 168 169hexbuf: .space 16 170