/* * linux/arch/arm/kernel/debug.S * * Copyright (C) 1994-1999 Russell King * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * 32-bit debugging code */ #include <linux/config.h> #include <linux/linkage.h> .text /* * Some debugging routines (useful if you've got MM problems and * printk isn't working). For DEBUGGING ONLY!!! Do not leave * references to these in a production kernel! */ #if defined(CONFIG_DEBUG_ICEDCC) @@ debug using ARM EmbeddedICE DCC channel .macro addruart, rx .endm .macro senduart, rd, rx mcr p14, 0, \rd, c1, c0, 0 .endm .macro busyuart, rd, rx 1001: mrc p14, 0, \rx, c0, c0, 0 tst \rx, #2 beq 1001b .endm .macro waituart, rd, rx mov \rd, #0x2000000 1001: subs \rd, \rd, #1 bmi 1002f mrc p14, 0, \rx, c0, c0, 0 tst \rx, #2 bne 1001b 1002: .endm #else #include <asm/arch/debug-macro.S> #endif /* * Useful debugging routines */ ENTRY(printhex8) mov r1, #8 b printhex ENTRY(printhex4) mov r1, #4 b printhex ENTRY(printhex2) mov r1, #2 printhex: adr r2, hexbuf add r3, r2, r1 mov r1, #0 strb r1, [r3] 1: and r1, r0, #15 mov r0, r0, lsr #4 cmp r1, #10 addlt r1, r1, #'0' addge r1, r1, #'a' - 10 strb r1, [r3, #-1]! teq r3, r2 bne 1b mov r0, r2 b printascii .ltorg ENTRY(printascii) addruart r3 b 2f 1: waituart r2, r3 senduart r1, r3 busyuart r2, r3 teq r1, #'\n' moveq r1, #'\r' beq 1b 2: teq r0, #0 ldrneb r1, [r0], #1 teqne r1, #0 bne 1b mov pc, lr ENTRY(printch) addruart r3 mov r1, r0 mov r0, #0 b 1b hexbuf: .space 16