From 99b8db7291ce58c83a4d3ad748c4a59ec7063d65 Mon Sep 17 00:00:00 2001
From: Heinrich Schuchardt <xypron.glpk@gmx.de>
Date: Thu, 5 Apr 2018 11:56:22 +0200
Subject: [PATCH] arm: print information about loaded UEFI images

If an exception occurs in a UEFI loaded image we need the start address of
the image to determine the relocation offset.

This patch adds the necessary lines after the registers in the crash dump.
A possible output would be:

UEFI image [0xbffe6000:0xbffe631f] pc=0x138 '/\snp.efi'

With the offset 0x138 we can now find the relevant instruction in the
disassembled 'snp.efi' binary.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Alexander Graf <agraf@suse.de>
---
 arch/arm/lib/interrupts.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/arch/arm/lib/interrupts.c b/arch/arm/lib/interrupts.c
index 80869ad..cda4d48 100644
--- a/arch/arm/lib/interrupts.c
+++ b/arch/arm/lib/interrupts.c
@@ -20,6 +20,7 @@
  */
 
 #include <common.h>
+#include <efi_loader.h>
 #include <asm/proc-armv/ptrace.h>
 #include <asm/u-boot-arm.h>
 #include <efi_loader.h>
@@ -51,6 +52,11 @@ void bad_mode (void)
 	reset_cpu (0);
 }
 
+static void show_efi_loaded_images(struct pt_regs *regs)
+{
+	efi_print_image_infos((void *)instruction_pointer(regs));
+}
+
 void show_regs (struct pt_regs *regs)
 {
 	unsigned long __maybe_unused flags;
@@ -106,6 +112,7 @@ void do_undefined_instruction (struct pt_regs *pt_regs)
 	printf ("undefined instruction\n");
 	fixup_pc(pt_regs, -4);
 	show_regs (pt_regs);
+	show_efi_loaded_images(pt_regs);
 	bad_mode ();
 }
 
@@ -115,6 +122,7 @@ void do_software_interrupt (struct pt_regs *pt_regs)
 	printf ("software interrupt\n");
 	fixup_pc(pt_regs, -4);
 	show_regs (pt_regs);
+	show_efi_loaded_images(pt_regs);
 	bad_mode ();
 }
 
@@ -124,6 +132,7 @@ void do_prefetch_abort (struct pt_regs *pt_regs)
 	printf ("prefetch abort\n");
 	fixup_pc(pt_regs, -8);
 	show_regs (pt_regs);
+	show_efi_loaded_images(pt_regs);
 	bad_mode ();
 }
 
@@ -133,6 +142,7 @@ void do_data_abort (struct pt_regs *pt_regs)
 	printf ("data abort\n");
 	fixup_pc(pt_regs, -8);
 	show_regs (pt_regs);
+	show_efi_loaded_images(pt_regs);
 	bad_mode ();
 }
 
@@ -142,6 +152,7 @@ void do_not_used (struct pt_regs *pt_regs)
 	printf ("not used\n");
 	fixup_pc(pt_regs, -8);
 	show_regs (pt_regs);
+	show_efi_loaded_images(pt_regs);
 	bad_mode ();
 }
 
@@ -151,6 +162,7 @@ void do_fiq (struct pt_regs *pt_regs)
 	printf ("fast interrupt request\n");
 	fixup_pc(pt_regs, -8);
 	show_regs (pt_regs);
+	show_efi_loaded_images(pt_regs);
 	bad_mode ();
 }
 
@@ -160,5 +172,6 @@ void do_irq (struct pt_regs *pt_regs)
 	printf ("interrupt request\n");
 	fixup_pc(pt_regs, -8);
 	show_regs (pt_regs);
+	show_efi_loaded_images(pt_regs);
 	bad_mode ();
 }