From: Ley Foon Tan <lftan@altera.com>
Date: Mon, 16 Feb 2015 11:26:43 +0000 (+0800)
Subject: nios2: add kgdb support
X-Git-Tag: omap-for-v4.1/prcm-dts-mfd-syscon-fix~64^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d16d2be111a61baf3a4696f07bfc7a8e36697cec;p=pandora-kernel.git

nios2: add kgdb support

Signed-off-by: Ley Foon Tan <lftan@altera.com>
---

diff --git a/arch/nios2/Kconfig b/arch/nios2/Kconfig
index f77991ecfd8e..437555424bda 100644
--- a/arch/nios2/Kconfig
+++ b/arch/nios2/Kconfig
@@ -8,6 +8,7 @@ config NIOS2
 	select GENERIC_IRQ_PROBE
 	select GENERIC_IRQ_SHOW
 	select HAVE_ARCH_TRACEHOOK
+	select HAVE_ARCH_KGDB
 	select IRQ_DOMAIN
 	select MODULES_USE_ELF_RELA
 	select OF
diff --git a/arch/nios2/include/asm/kgdb.h b/arch/nios2/include/asm/kgdb.h
new file mode 100644
index 000000000000..8fd5e3b66c57
--- /dev/null
+++ b/arch/nios2/include/asm/kgdb.h
@@ -0,0 +1,93 @@
+/*
+ * Copyright (C) 2015 Altera Corporation
+ * Copyright (C) 2011 Tobias Klauser <tklauser@distanz.ch>
+ *
+ * Based on the code posted by Kazuyasu on the Altera Forum at:
+ * http://www.alteraforum.com/forum/showpost.php?p=77003&postcount=20
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef _ASM_NIOS2_KGDB_H
+#define _ASM_NIOS2_KGDB_H
+
+#define CACHE_FLUSH_IS_SAFE	1
+#define BUFMAX			2048
+
+enum regnames {
+	GDB_R0 = 0,
+	GDB_AT,
+	GDB_R2,
+	GDB_R3,
+	GDB_R4,
+	GDB_R5,
+	GDB_R6,
+	GDB_R7,
+	GDB_R8,
+	GDB_R9,
+	GDB_R10,
+	GDB_R11,
+	GDB_R12,
+	GDB_R13,
+	GDB_R14,
+	GDB_R15,
+	GDB_R16,
+	GDB_R17,
+	GDB_R18,
+	GDB_R19,
+	GDB_R20,
+	GDB_R21,
+	GDB_R22,
+	GDB_R23,
+	GDB_ET,
+	GDB_BT,
+	GDB_GP,
+	GDB_SP,
+	GDB_FP,
+	GDB_EA,
+	GDB_BA,
+	GDB_RA,
+	GDB_PC,
+	GDB_STATUS,
+	GDB_ESTATUS,
+	GDB_BSTATUS,
+	GDB_IENABLE,
+	GDB_IPENDING,
+	GDB_CPUID,
+	GDB_CTL6,
+	GDB_EXCEPTION,
+	GDB_PTEADDR,
+	GDB_TLBACC,
+	GDB_TLBMISC,
+	GDB_ECCINJ,
+	GDB_BADADDR,
+	GDB_CONFIG,
+	GDB_MPUBASE,
+	GDB_MPUACC,
+	/* do not change the last entry or anything below! */
+	GDB_NUMREGBYTES		/* number of registers */
+};
+
+#define GDB_SIZEOF_REG		sizeof(u32)
+#define DBG_MAX_REG_NUM	(49)
+#define NUMREGBYTES		(DBG_MAX_REG_NUM * sizeof(GDB_SIZEOF_REG))
+
+#define BREAK_INSTR_SIZE	4
+static inline void arch_kgdb_breakpoint(void)
+{
+	__asm__ __volatile__("trap 30\n");
+}
+
+#endif /* _ASM_NIOS2_KGDB_H */
diff --git a/arch/nios2/kernel/Makefile b/arch/nios2/kernel/Makefile
index eaaa894c432f..1aae25703657 100644
--- a/arch/nios2/kernel/Makefile
+++ b/arch/nios2/kernel/Makefile
@@ -21,5 +21,6 @@ obj-y	+= time.o
 obj-y	+= traps.o
 
 obj-$(CONFIG_EARLY_PRINTK)		+= early_printk.o
+obj-$(CONFIG_KGDB)			+= kgdb.o
 obj-$(CONFIG_MODULES)			+= module.o
 obj-$(CONFIG_NIOS2_ALIGNMENT_TRAP)	+= misaligned.o
diff --git a/arch/nios2/kernel/entry.S b/arch/nios2/kernel/entry.S
index 0bdfd13ff98b..7729bd3f2e79 100644
--- a/arch/nios2/kernel/entry.S
+++ b/arch/nios2/kernel/entry.S
@@ -121,7 +121,11 @@ trap_table:
 	.word	instruction_trap	/* 27 */
 	.word	instruction_trap	/* 28 */
 	.word	instruction_trap	/* 29 */
-	.word	instruction_trap	/* 30 */
+#ifdef CONFIG_KGDB
+	.word	handle_kgdb_breakpoint	/* 30 KGDB breakpoint */
+#else
+	.word	instruction_trap		/* 30 */
+#endif
 	.word	handle_breakpoint	/* 31 */
 
 .text
@@ -445,6 +449,12 @@ handle_diverror:
 	call	handle_diverror_c
 	br	ret_from_exception
 
+#ifdef CONFIG_KGDB
+handle_kgdb_breakpoint:
+	call	kgdb_breakpoint_c
+	br	ret_from_exception
+#endif
+
 /*
  * Beware - when entering resume, prev (the current task) is
  * in r4, next (the new task) is in r5, don't change these
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