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From: takahiro.akashi@linaro.org (AKASHI Takahiro)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v22 5/8] arm64: kdump: add VMCOREINFO's for user-space coredump tools
Date: Tue, 12 Jul 2016 14:05:11 +0900	[thread overview]
Message-ID: <20160712050514.22307-6-takahiro.akashi@linaro.org> (raw)
In-Reply-To: <20160712050514.22307-1-takahiro.akashi@linaro.org>

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 <takahiro.akashi@linaro.org>
---
 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

  parent reply	other threads:[~2016-07-12  5:05 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-07-12  5:05 [PATCH v22 0/8] arm64: add kdump support AKASHI Takahiro
2016-07-12  5:05 ` [PATCH v22 1/8] arm64: kdump: reserve memory for crash dump kernel AKASHI Takahiro
2016-07-13  9:12   ` Suzuki K Poulose
2016-07-13 15:42     ` AKASHI Takahiro
2016-07-19  9:39   ` Dennis Chen
2016-07-19 10:28     ` AKASHI Takahiro
2016-07-19 10:41       ` Dennis Chen
2016-07-19 12:48         ` Mark Salter
2016-07-19 13:27           ` Mark Rutland
2016-07-20  2:17             ` AKASHI Takahiro
2016-07-20  3:48             ` Dennis Chen
2016-07-19 23:34           ` AKASHI Takahiro
2016-07-12  5:05 ` [PATCH v22 2/8] arm64: limit memory regions based on DT property, usable-memory-range AKASHI Takahiro
2016-07-18 18:04   ` James Morse
2016-07-19  8:35     ` AKASHI Takahiro
2016-07-19 10:06       ` Dennis Chen
2016-07-19 11:01         ` AKASHI Takahiro
2016-07-20  3:39           ` Dennis Chen
2016-07-20  4:22             ` AKASHI Takahiro
2016-07-20  4:36               ` Dennis Chen
2016-07-21  0:57     ` AKASHI Takahiro
2016-07-22 13:55       ` James Morse
2016-07-25  5:27         ` AKASHI Takahiro
2016-08-04  6:21           ` AKASHI Takahiro
2016-08-09 16:22             ` James Morse
2016-07-12  5:05 ` [PATCH v22 3/8] arm64: kdump: implement machine_crash_shutdown() AKASHI Takahiro
2016-07-13  9:32   ` Suzuki K Poulose
2016-07-13 16:00     ` AKASHI Takahiro
2016-07-12  5:05 ` [PATCH v22 4/8] arm64: kdump: add kdump support AKASHI Takahiro
2016-07-12  5:05 ` AKASHI Takahiro [this message]
2016-07-12  5:05 ` [PATCH v22 6/8] arm64: kdump: enable kdump in the arm64 defconfig AKASHI Takahiro
2016-07-12  5:05 ` [PATCH v22 7/8] arm64: kdump: update a kernel doc AKASHI Takahiro
2016-07-12  5:05 ` [PATCH v22 8/8] Documentation: dt: chosen properties for arm64 kdump AKASHI Takahiro
2016-07-12 10:07   ` Mark Rutland
2016-07-13 15:14     ` AKASHI Takahiro

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