[PATCH v26 4/7] arm64: kdump: add VMCOREINFO's for user-space coredump tools
From: AKASHI Takahiro <hidden>
Date: 2016-09-07 04:29:06
Also in:
kexec
Subsystem:
arm64 port (aarch64 architecture), the rest · Maintainers:
Catalin Marinas, Will Deacon, Linus Torvalds
For the current crash utility, we need to know, at least, - kimage_voffset - PHYS_OFFSET to handle the contents of core dump file (/proc/vmcore) correctly due to the introduction of KASLR (CONFIG_RANDOMIZE_BASE) in v4.6. This patch puts them as VMCOREINFO's into the file. - VA_BITS is also added for makedumpfile command. More VMCOREINFO's may be added later. Signed-off-by: AKASHI Takahiro <redacted> --- arch/arm64/kernel/machine_kexec.c | 11 +++++++++++ 1 file changed, 11 insertions(+)
diff --git a/arch/arm64/kernel/machine_kexec.c b/arch/arm64/kernel/machine_kexec.c
index 8ac9dba8..38b4411 100644
--- a/arch/arm64/kernel/machine_kexec.c
+++ b/arch/arm64/kernel/machine_kexec.c@@ -17,6 +17,7 @@ #include <asm/cacheflush.h> #include <asm/cpu_ops.h> +#include <asm/memory.h> #include <asm/mmu_context.h> #include "cpu-reset.h"
@@ -260,3 +261,13 @@ void machine_crash_shutdown(struct pt_regs *regs) pr_info("Starting crashdump kernel...\n"); } + +void arch_crash_save_vmcoreinfo(void) +{ + VMCOREINFO_NUMBER(VA_BITS); + /* Please note VMCOREINFO_NUMBER() uses "%d", not "%x" */ + vmcoreinfo_append_str("NUMBER(kimage_voffset)=0x%llx\n", + kimage_voffset); + vmcoreinfo_append_str("NUMBER(PHYS_OFFSET)=0x%llx\n", + PHYS_OFFSET); +}
--
2.9.0