libpayload: Make it possible to install callbacks for particular exceptions.

To support a GDB stub, it will be necessary to trap various exceptions which
will be used to implement breakpoints, single stepping, etc.

BUG=None
TEST=Built and booted on Link with hooks installed and saw that they
triggered when exceptions occurred. Built and booted on nyan.
BRANCH=None

Original-Change-Id: Iab659365864a3055159a50b8f6e5c44290d3ba2b
Original-Signed-off-by: Gabe Black <gabeblack@google.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/179602
Original-Reviewed-by: Gabe Black <gabeblack@chromium.org>
Original-Tested-by: Gabe Black <gabeblack@chromium.org>
Original-Commit-Queue: Gabe Black <gabeblack@chromium.org>
(cherry picked from commit 8db0897b1ddad600e247cb4df147c757a8187626)
Signed-off-by: Marc Jones <marc.jones@se-eng.com>

Change-Id: I5e7f724b99988cd259909dd3bd01166fa52317ec
Reviewed-on: http://review.coreboot.org/7656
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

3 files changed, 100 insertions, 2 deletions

diff --git a/payloads/libpayload/include/arm/arch/exception.h b/payloads/libpayload/include/arm/arch/exception.h
index a0d9413f1c..13fda57aa7 100644
--- a/payloads/libpayload/include/arm/arch/exception.h
+++ b/payloads/libpayload/include/arm/arch/exception.h
@@ -30,9 +30,23 @@
 #ifndef _ARCH_EXCEPTION_H
 #define _ARCH_EXCEPTION_H
 
-#include <exception.h>
 #include <stdint.h>
 
 void set_vbar(uint32_t vbar);
 
+struct exception_state
+{
+	uint32_t regs[16];
+} __attribute__((packed));
+
+enum {
+	EXC_UNDEF = 1,
+	EXC_SWI = 2,
+	EXC_PABORT = 3,
+	EXC_DABORT = 4,
+	EXC_IRQ = 6,
+	EXC_FIQ = 7,
+	EXC_COUNT
+};
+
 #endif
diff --git a/payloads/libpayload/include/exception.h b/payloads/libpayload/include/exception.h
index 6d118e7ba6..1d9b832c07 100644
--- a/payloads/libpayload/include/exception.h
+++ b/payloads/libpayload/include/exception.h
@@ -30,8 +30,11 @@
 #ifndef _EXCEPTION_H
 #define _EXCEPTION_H
 
-#include <stdint.h>
+#include <arch/exception.h>
+
+typedef void (*exception_hook)(int type, struct exception_state *state);
 
 void exception_init(void);
+void exception_install_hook(int type, exception_hook hook);
 
 #endif
diff --git a/payloads/libpayload/include/x86/arch/exception.h b/payloads/libpayload/include/x86/arch/exception.h
new file mode 100644
index 0000000000..82f2ca0a32
--- /dev/null
+++ b/payloads/libpayload/include/x86/arch/exception.h
@@ -0,0 +1,81 @@
+/*
+ * This file is part of the libpayload project.
+ *
+ * Copyright 2013 Google Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
+ */
+
+#ifndef _ARCH_EXCEPTION_H
+#define _ARCH_EXCEPTION_H
+
+#include <stdint.h>
+
+void exception_dispatch(void);
+void exception_init_asm(void);
+
+struct exception_state
+{
+	uint32_t eax;
+	uint32_t ecx;
+	uint32_t edx;
+	uint32_t ebx;
+	uint32_t esp;
+	uint32_t ebp;
+	uint32_t esi;
+	uint32_t edi;
+	uint32_t eip;
+	uint32_t eflags;
+	uint32_t cs;
+	uint32_t ss;
+	uint32_t ds;
+	uint32_t es;
+	uint32_t fs;
+	uint32_t gs;
+} __attribute__((packed));
+
+enum {
+	EXC_DE = 0, /* Divide by zero */
+	EXC_DB = 1, /* Debug */
+	EXC_NMI = 2, /* Non maskable interrupt */
+	EXC_BP = 3, /* Breakpoint */
+	EXC_OF = 4, /* Overflow */
+	EXC_BR = 5, /* Bound range */
+	EXC_UD = 6, /* Invalid opcode */
+	EXC_NM = 7, /* Device not available */
+	EXC_DF = 8, /* Double fault */
+	EXC_TS = 10, /* Invalid TSS */
+	EXC_NP = 11, /* Segment not present */
+	EXC_SS = 12, /* Stack */
+	EXC_GP = 13, /* General protection */
+	EXC_PF = 14, /* Page fault */
+	EXC_MF = 16, /* x87 floating point */
+	EXC_AC = 17, /* Alignment check */
+	EXC_MC = 18, /* Machine check */
+	EXC_XF = 19, /* SIMD floating point */
+	EXC_SX = 30, /* Security */
+	EXC_COUNT
+};
+
+#endif