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riscv: Dump out kernel offset information on panic

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

Signed-off-by: Zong Li <zong.li@sifive.com>
Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Tested-by: Conor Dooley <conor.dooley@microchip.com>
Tested-by: Song Shuai <songshuaishuai@tinylab.org>
Reviewed-by: Sami Tolvanen <samitolvanen@google.com>
Tested-by: Sami Tolvanen <samitolvanen@google.com>
Link: https://lore.kernel.org/r/20230722123850.634544-3-alexghiti@rivosinc.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Alexandre Ghiti 2023-07-22 14:38:47 +02:00 committed by Palmer Dabbelt
parent 84fe419dc7
commit 54a519e6af
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GPG Key ID: 2E1319F35FBB1889
1 changed files with 25 additions and 0 deletions
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25
arch/riscv/kernel/setup.c
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@ -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);