juno: Implement 'plat_print_gic_regs' macro

The 'plat_print_gic_regs' macro will print the contents of
the GICC_IAR and GICC_CTLR registers.

Change-Id: Ib435522c2d597e15c31fe05f9b0b310b9053206c

plat/juno/include/plat_macros.S

+/*
+ * Copyright (c) 2014, ARM Limited and Contributors. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ *
+ * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * Neither the name of ARM nor the names of its contributors may be used
+ * to endorse or promote products derived from this software without specific
+ * prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <gic_v2.h>
+#include "../juno_def.h"
+
+.section .rodata.gic_reg_name, "aS"
+gic_regs: .asciz "gic_iar", "gic_ctlr", ""
+
+/* Currently we have only 2 GIC registers to report */
+#define GIC_REG_SIZE		(2 * 8)
+	/* ---------------------------------------------
+	 * The below macro prints out relevant GIC
+	 * registers whenever an unhandled exception is
+	 * taken in BL3-1.
+	 * ---------------------------------------------
+	 */
+	.macro plat_print_gic_regs
+	ldr	x0, =GICC_BASE
+	ldr	w1, [x0, #GICC_IAR]
+	ldr	w2, [x0, #GICC_CTLR]
+	sub	sp, sp, #GIC_REG_SIZE
+	stp	x1, x2, [sp] /* we store the gic registers as 64 bit */
+	adr	x0, gic_regs
+	mov	x1, sp
+	bl	print_string_value
+	add	sp, sp, #GIC_REG_SIZE
+	.endm

plat/juno/platform.mk

@@ -28,10 +28,7 @@
 # POSSIBILITY OF SUCH DAMAGE.
 #
 
-#
-# No additional platform system include directories required
-#
-# PLAT_INCLUDES		:=
+PLAT_INCLUDES		:=	-Iplat/juno/include/
 
 PLAT_BL_COMMON_SOURCES	:=	drivers/arm/pl011/pl011_console.c	\
 				drivers/arm/pl011/pl011.c		\