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#include <asm/memory.h> 14 15 .text 16 17/* 18 * Some debugging routines (useful if you've got MM problems and 19 * printk isn't working). For DEBUGGING ONLY!!! Do not leave 20 * references to these in a production kernel! 21 */ 22 23#if defined(CONFIG_DEBUG_ICEDCC) 24 @@ debug using ARM EmbeddedICE DCC channel 25 26#if defined(CONFIG_CPU_V6) 27 28 .macro addruart, rx, tmp 29 .endm 30 31 .macro senduart, rd, rx 32 mcr p14, 0, \rd, c0, c5, 0 33 .endm 34 35 .macro busyuart, rd, rx 361001: 37 mrc p14, 0, \rx, c0, c1, 0 38 tst \rx, #0x20000000 39 beq 1001b 40 .endm 41 42 .macro waituart, rd, rx 43 mov \rd, #0x2000000 441001: 45 subs \rd, \rd, #1 46 bmi 1002f 47 mrc p14, 0, \rx, c0, c1, 0 48 tst \rx, #0x20000000 49 bne 1001b 501002: 51 .endm 52 53#elif defined(CONFIG_CPU_V7) 54 55 .macro addruart, rx, tmp 56 .endm 57 58 .macro senduart, rd, rx 59 mcr p14, 0, \rd, c0, c5, 0 60 .endm 61 62 .macro busyuart, rd, rx 63busy: mrc p14, 0, pc, c0, c1, 0 64 bcs busy 65 .endm 66 67 .macro waituart, rd, rx 68wait: mrc p14, 0, pc, c0, c1, 0 69 bcs wait 70 71 .endm 72 73#elif defined(CONFIG_CPU_XSCALE) 74 75 .macro addruart, rx, tmp 76 .endm 77 78 .macro senduart, rd, rx 79 mcr p14, 0, \rd, c8, c0, 0 80 .endm 81 82 .macro busyuart, rd, rx 831001: 84 mrc p14, 0, \rx, c14, c0, 0 85 tst \rx, #0x10000000 86 beq 1001b 87 .endm 88 89 .macro waituart, rd, rx 90 mov \rd, #0x10000000 911001: 92 subs \rd, \rd, #1 93 bmi 1002f 94 mrc p14, 0, \rx, c14, c0, 0 95 tst \rx, #0x10000000 96 bne 1001b 971002: 98 .endm 99 100#else 101 102 .macro addruart, rx, tmp 103 .endm 104 105 .macro senduart, rd, rx 106 mcr p14, 0, \rd, c1, c0, 0 107 .endm 108 109 .macro busyuart, rd, rx 1101001: 111 mrc p14, 0, \rx, c0, c0, 0 112 tst \rx, #2 113 beq 1001b 114 115 .endm 116 117 .macro waituart, rd, rx 118 mov \rd, #0x2000000 1191001: 120 subs \rd, \rd, #1 121 bmi 1002f 122 mrc p14, 0, \rx, c0, c0, 0 123 tst \rx, #2 124 bne 1001b 1251002: 126 .endm 127 128#endif /* CONFIG_CPU_V6 */ 129 130#else 131#include <mach/debug-macro.S> 132#endif /* CONFIG_DEBUG_ICEDCC */ 133 134/* 135 * Useful debugging routines 136 */ 137ENTRY(printhex8) 138 mov r1, #8 139 b printhex 140ENDPROC(printhex8) 141 142ENTRY(printhex4) 143 mov r1, #4 144 b printhex 145ENDPROC(printhex4) 146 147ENTRY(printhex2) 148 mov r1, #2 149printhex: 150 mrc p15, 0, r2, c1, c0 @ read SysCtrl 151 tst r2, #1 @ MMU enabled? 152 ldrne r2, =hexbuf @ =1 virtual 153 ldreq r2, =__virt_to_phys(hexbuf) @ =0 physical 154 add r3, r2, r1 155 mov r1, #0 156 strb r1, [r3] 1571: and r1, r0, #15 158 mov r0, r0, lsr #4 159 cmp r1, #10 160 addlt r1, r1, #'0' 161 addge r1, r1, #'a' - 10 162 strb r1, [r3, #-1]! 163 teq r3, r2 164 bne 1b 165 mov r0, r2 166 b printascii 167ENDPROC(printhex2) 168 169 .ltorg 170 171ENTRY(printascii) 172 addruart r3, r1 173 b 2f 1741: waituart r2, r3 175 senduart r1, r3 176 busyuart r2, r3 177 teq r1, #'\n' 178 moveq r1, #'\r' 179 beq 1b 1802: teq r0, #0 181 ldrneb r1, [r0], #1 182 teqne r1, #0 183 bne 1b 184 mov pc, lr 185ENDPROC(printascii) 186 187ENTRY(printch) 188 addruart r3, r1 189 mov r1, r0 190 mov r0, #0 191 b 1b 192ENDPROC(printch) 193 194 .bss 195hexbuf: .space 16 196