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| author | Alexandre Ghiti <alexghiti@rivosinc.com> | 2023-07-22 15:38:47 +0300 |
|---|---|---|
| committer | Palmer Dabbelt <palmer@rivosinc.com> | 2023-09-06 05:49:28 +0300 |
| commit | 54a519e6aff9a6bc8922149e94f89c4bf4e3e8fb (patch) | |
| tree | a2514003930611f0696cd4625479fef7d11ce800 | |
| parent | 84fe419dc7578b03e721b9bd6eb07947db70fd0e (diff) | |
| download | linux-54a519e6aff9a6bc8922149e94f89c4bf4e3e8fb.tar.xz | |
riscv: Dump out kernel offset information on panic
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>
| -rw-r--r-- | arch/riscv/kernel/setup.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/arch/riscv/kernel/setup.c b/arch/riscv/kernel/setup.c index 971fe776e2f8..0fb5a26ca4cc 100644 --- a/arch/riscv/kernel/setup.c +++ b/arch/riscv/kernel/setup.c @@ -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); |