From 61598093bbdd283a7edc367d900f223070ead8d2 Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Fri, 10 May 2024 07:43:03 +0000
Subject: [PATCH] add ax88772C AX88772C_eeprom_tools
---
kernel/kernel/crash_core.c | 58 +++++++++++++++++++++++++++++++++++++++++++++++++++++++---
1 files changed, 55 insertions(+), 3 deletions(-)
diff --git a/kernel/kernel/crash_core.c b/kernel/kernel/crash_core.c
index 933cb3e..4a5fed2 100644
--- a/kernel/kernel/crash_core.c
+++ b/kernel/kernel/crash_core.c
@@ -1,9 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* crash.c - kernel crash support code.
* Copyright (C) 2002-2004 Eric Biederman <ebiederm@xmission.com>
- *
- * This source code is licensed under the GNU General Public License,
- * Version 2. See the file COPYING for more details.
*/
#include <linux/crash_core.h>
@@ -12,6 +10,8 @@
#include <asm/page.h>
#include <asm/sections.h>
+
+#include <crypto/sha.h>
/* vmcoreinfo stuff */
unsigned char *vmcoreinfo_data;
@@ -378,6 +378,53 @@
}
EXPORT_SYMBOL(paddr_vmcoreinfo_note);
+#define NOTES_SIZE (&__stop_notes - &__start_notes)
+#define BUILD_ID_MAX SHA1_DIGEST_SIZE
+#define NT_GNU_BUILD_ID 3
+
+struct elf_note_section {
+ struct elf_note n_hdr;
+ u8 n_data[];
+};
+
+/*
+ * Add build ID from .notes section as generated by the GNU ld(1)
+ * or LLVM lld(1) --build-id option.
+ */
+static void add_build_id_vmcoreinfo(void)
+{
+ char build_id[BUILD_ID_MAX * 2 + 1];
+ int n_remain = NOTES_SIZE;
+
+ while (n_remain >= sizeof(struct elf_note)) {
+ const struct elf_note_section *note_sec =
+ &__start_notes + NOTES_SIZE - n_remain;
+ const u32 n_namesz = note_sec->n_hdr.n_namesz;
+
+ if (note_sec->n_hdr.n_type == NT_GNU_BUILD_ID &&
+ n_namesz != 0 &&
+ !strcmp((char *)¬e_sec->n_data[0], "GNU")) {
+ if (note_sec->n_hdr.n_descsz <= BUILD_ID_MAX) {
+ const u32 n_descsz = note_sec->n_hdr.n_descsz;
+ const u8 *s = ¬e_sec->n_data[n_namesz];
+
+ s = PTR_ALIGN(s, 4);
+ bin2hex(build_id, s, n_descsz);
+ build_id[2 * n_descsz] = '\0';
+ VMCOREINFO_BUILD_ID(build_id);
+ return;
+ }
+ pr_warn("Build ID is too large to include in vmcoreinfo: %u > %u\n",
+ note_sec->n_hdr.n_descsz,
+ BUILD_ID_MAX);
+ return;
+ }
+ n_remain -= sizeof(struct elf_note) +
+ ALIGN(note_sec->n_hdr.n_namesz, 4) +
+ ALIGN(note_sec->n_hdr.n_descsz, 4);
+ }
+}
+
static int __init crash_save_vmcoreinfo_init(void)
{
vmcoreinfo_data = (unsigned char *)get_zeroed_page(GFP_KERNEL);
@@ -396,6 +443,7 @@
}
VMCOREINFO_OSRELEASE(init_uts_ns.name.release);
+ add_build_id_vmcoreinfo();
VMCOREINFO_PAGESIZE(PAGE_SIZE);
VMCOREINFO_SYMBOL(init_uts_ns);
@@ -415,6 +463,8 @@
VMCOREINFO_LENGTH(mem_section, NR_SECTION_ROOTS);
VMCOREINFO_STRUCT_SIZE(mem_section);
VMCOREINFO_OFFSET(mem_section, section_mem_map);
+ VMCOREINFO_NUMBER(SECTION_SIZE_BITS);
+ VMCOREINFO_NUMBER(MAX_PHYSMEM_BITS);
#endif
VMCOREINFO_STRUCT_SIZE(page);
VMCOREINFO_STRUCT_SIZE(pglist_data);
@@ -464,6 +514,8 @@
VMCOREINFO_NUMBER(PAGE_BUDDY_MAPCOUNT_VALUE);
#ifdef CONFIG_HUGETLB_PAGE
VMCOREINFO_NUMBER(HUGETLB_PAGE_DTOR);
+#define PAGE_OFFLINE_MAPCOUNT_VALUE (~PG_offline)
+ VMCOREINFO_NUMBER(PAGE_OFFLINE_MAPCOUNT_VALUE);
#endif
arch_crash_save_vmcoreinfo();
--
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