/* * 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/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, rp, rv .endm #if defined(CONFIG_CPU_V6) .macro senduart, rd, rx mcr p14, 0, \rd, c0, c5, 0 .endm .macro busyuart, rd, rx 1001: mrc p14, 0, \rx, c0, c1, 0 tst \rx, #0x20000000 beq 1001b .endm .macro waituart, rd, rx mov \rd, #0x2000000 1001: subs \rd, \rd, #1 bmi 1002f mrc p14, 0, \rx, c0, c1, 0 tst \rx, #0x20000000 bne 1001b 1002: .endm #elif defined(CONFIG_CPU_V7) .macro senduart, rd, rx mcr p14, 0, \rd, c0, c5, 0 .endm .macro busyuart, rd, rx busy: mrc p14, 0, pc, c0, c1, 0 bcs busy .endm .macro waituart, rd, rx wait: mrc p14, 0, pc, c0, c1, 0 bcs wait .endm #elif defined(CONFIG_CPU_XSCALE) .macro senduart, rd, rx mcr p14, 0, \rd, c8, c0, 0 .endm .macro busyuart, rd, rx 1001: mrc p14, 0, \rx, c14, c0, 0 tst \rx, #0x10000000 beq 1001b .endm .macro waituart, rd, rx mov \rd, #0x10000000 1001: subs \rd, \rd, #1 bmi 1002f mrc p14, 0, \rx, c14, c0, 0 tst \rx, #0x10000000 bne 1001b 1002: .endm #else .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 #endif /* CONFIG_CPU_V6 */ #else #include <mach/debug-macro.S> #endif /* CONFIG_DEBUG_ICEDCC */ #ifdef CONFIG_MMU .macro addruart_current, rx, tmp1, tmp2 addruart \tmp1, \tmp2 mrc p15, 0, \rx, c1, c0 tst \rx, #1 moveq \rx, \tmp1 movne \rx, \tmp2 .endm #else /* !CONFIG_MMU */ .macro addruart_current, rx, tmp1, tmp2 addruart \rx, \tmp1 .endm #endif /* CONFIG_MMU */ /* * Useful debugging routines */ ENTRY(printhex8) mov r1, #8 b printhex ENDPROC(printhex8) ENTRY(printhex4) mov r1, #4 b printhex ENDPROC(printhex4) 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 ENDPROC(printhex2) .ltorg ENTRY(printascii) addruart_current r3, r1, r2 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 ENDPROC(printascii) ENTRY(printch) addruart_current r3, r1, r2 mov r1, r0 mov r0, #0 b 1b ENDPROC(printch) hexbuf: .space 16