Unverified Commit 54a519e6 authored by Alexandre Ghiti's avatar Alexandre Ghiti Committed by Palmer Dabbelt
Browse files

riscv: Dump out kernel offset information on panic 



Dump out the KASLR virtual kernel offset when panic to help debug kernel.

Signed-off-by: default avatarZong Li <zong.li@sifive.com>
Signed-off-by: default avatarAlexandre Ghiti <alexghiti@rivosinc.com>
Tested-by: default avatarConor Dooley <conor.dooley@microchip.com>
Tested-by: default avatarSong Shuai <songshuaishuai@tinylab.org>
Reviewed-by: default avatarSami Tolvanen <samitolvanen@google.com>
Tested-by: default avatarSami Tolvanen <samitolvanen@google.com>
Link: https://lore.kernel.org/r/20230722123850.634544-3-alexghiti@rivosinc.com


Signed-off-by: default avatarPalmer Dabbelt <palmer@rivosinc.com>
parent 84fe419d

arch/riscv/kernel/setup.c

+25 −0
Original line number Diff line number Diff line
@@ -21,6 +21,7 @@ 
#include <linux/smp.h>

#include <linux/efi.h>

#include <linux/crash_dump.h>

#include <linux/panic_notifier.h>



#include <asm/acpi.h>

#include <asm/alternative.h>
@@ -341,3 +342,27 @@ void free_initmem(void) 


	free_initmem_default(POISON_FREE_INITMEM);

}



static int dump_kernel_offset(struct notifier_block *self,

			      unsigned long v, void *p)

{

	pr_emerg("Kernel Offset: 0x%lx from 0x%lx\n",

		 kernel_map.virt_offset,

		 KERNEL_LINK_ADDR);



	return 0;

}



static struct notifier_block kernel_offset_notifier = {

	.notifier_call = dump_kernel_offset

};



static int __init register_kernel_offset_dumper(void)

{

	if (IS_ENABLED(CONFIG_RANDOMIZE_BASE))

		atomic_notifier_chain_register(&panic_notifier_list,

					       &kernel_offset_notifier);



	return 0;

}

device_initcall(register_kernel_offset_dumper);