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-rw-r--r--arch/arm/kernel/debug.S106
1 files changed, 106 insertions, 0 deletions
diff --git a/arch/arm/kernel/debug.S b/arch/arm/kernel/debug.S
new file mode 100644
index 000000000000..caaa919ab47a
--- /dev/null
+++ b/arch/arm/kernel/debug.S
@@ -0,0 +1,106 @@
+/*
+ * 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>
+#include <asm/hardware.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