Rework BL3-1 unhandled exception handling and reporting
This patch implements the register reporting when unhandled exceptions are
taken in BL3-1. Unhandled exceptions will result in a dump of registers
to the console, before halting execution by that CPU. The Crash Stack,
previously called the Exception Stack, is used for this activity.
This stack is used to preserve the CPU context and runtime stack
contents for debugging and analysis.
This also introduces the per_cpu_ptr_cache, referenced by tpidr_el3,
to provide easy access to some of BL3-1 per-cpu data structures.
Initially, this is used to provide a pointer to the Crash stack.
panic() now prints the the error file and line number in Debug mode
and prints the PC value in release mode.
The Exception Stack is renamed to Crash Stack with this patch.
The original intention of exception stack is no longer valid
since we intend to support several valid exceptions like IRQ
and FIQ in the trusted firmware context. This stack is now
utilized for dumping and reporting the system state when a
crash happens and hence the rename.
Fixes ARM-software/tf-issues#79 Improve reporting of unhandled exception
Change-Id: I260791dc05536b78547412d147193cdccae7811a
diff --git a/plat/fvp/include/plat_macros.S b/plat/fvp/include/plat_macros.S
new file mode 100644
index 0000000..0b9b2e2
--- /dev/null
+++ b/plat/fvp/include/plat_macros.S
@@ -0,0 +1,57 @@
+/*
+ * 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 <platform.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 BL31.
+ * ---------------------------------------------
+ */
+ .macro plat_print_gic_regs
+ mov x0, #CONFIG_GICC_ADDR
+ bl platform_get_cfgvar
+ /* gic base address is now in x0 */
+ ldr w1, [x0, #GICC_IAR]
+ ldr w2, [x0, #GICD_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