From 74b76357dfd75550cd9a511e71990d414a4d023e Mon Sep 17 00:00:00 2001
From: Heinrich Schuchardt <xypron.glpk@gmx.de>
Date: Sun, 25 Aug 2019 19:55:12 +0200
Subject: [PATCH] x86: show UEFI images involved in crash

If a crash occurs, show the loaded UEFI images to facilitate analysis.

This is an example output:

=> bootefi 0x1000000
Found 0 disks
Hello world of bugs!
Invalid Opcode (Undefined Opcode)
EIP: 0010:[<06ceb06e>] EFLAGS: 00010206
Original EIP :[<fec9906e>]
EAX: 00000000 EBX: 06cec000 ECX: 00000fd0 EDX: 00000001
ESI: 06ced18a EDI: 07d0fe10 EBP: 07fe27a0 ESP: 07d0fde0
 DS: 0018 ES: 0018 FS: 0020 GS: 0018 SS: 0018
CR0: 00000033 CR2: 00000000 CR3: 00000000 CR4: 00000000
DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
DR6: ffff0ff0 DR7: 00000400
Stack:
    0x07d0fde8 : 0x00000000
    0x07d0fde4 : 0x06ced040
--->0x07d0fde0 : 0x07fe27a0
    0x07d0fddc : 0x00010206
    0x07d0fdd8 : 0x00000010
    0x07d0fdd4 : 0x06ceb06e
UEFI image [0x06cea000:0x06cf0fff] pc=0x106e '/bug-i386.efi'
### ERROR ### Please RESET the board ###

With the additional information provided by this patch we know that the
problem occurred 0x106e after the load address of bug-i386.efi.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>
---
 arch/x86/cpu/i386/interrupt.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/arch/x86/cpu/i386/interrupt.c b/arch/x86/cpu/i386/interrupt.c
index 47df3172b7..1445204878 100644
--- a/arch/x86/cpu/i386/interrupt.c
+++ b/arch/x86/cpu/i386/interrupt.c
@@ -12,6 +12,7 @@
 
 #include <common.h>
 #include <dm.h>
+#include <efi_loader.h>
 #include <asm/control_regs.h>
 #include <asm/i8259.h>
 #include <asm/interrupt.h>
@@ -64,6 +65,18 @@ static char *exceptions[] = {
 	"Reserved"
 };
 
+/**
+ * show_efi_loaded_images() - show loaded UEFI images
+ *
+ * List all loaded UEFI images.
+ *
+ * @eip:	instruction pointer
+ */
+static void show_efi_loaded_images(uintptr_t eip)
+{
+	efi_print_image_infos((void *)eip);
+}
+
 static void dump_regs(struct irq_regs *regs)
 {
 	unsigned long cs, eip, eflags;
@@ -144,6 +157,7 @@ static void dump_regs(struct irq_regs *regs)
 		printf("0x%8.8lx : 0x%8.8lx\n", sp, (ulong)readl(sp));
 		sp -= 4;
 	}
+	show_efi_loaded_images(eip);
 }
 
 static void do_exception(struct irq_regs *regs)
-- 
2.25.1