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64e166099b
Commit cf8e865810 ("arch: Remove Itanium (IA-64) architecture")
removed the last use of the absolute kallsyms.
Signed-off-by: Jann Horn <jannh@google.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/all/20240221202655.2423854-1-jannh@google.com/
[masahiroy@kernel.org: rebase the code and reword the commit description]
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
230 lines
6.1 KiB
C
230 lines
6.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* crash.c - kernel crash support code.
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* Copyright (C) 2002-2004 Eric Biederman <ebiederm@xmission.com>
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*/
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#include <linux/buildid.h>
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#include <linux/init.h>
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#include <linux/utsname.h>
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#include <linux/vmalloc.h>
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#include <linux/sizes.h>
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#include <linux/kexec.h>
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#include <linux/memory.h>
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#include <linux/cpuhotplug.h>
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#include <linux/memblock.h>
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#include <linux/kmemleak.h>
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#include <asm/page.h>
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#include <asm/sections.h>
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#include <crypto/sha1.h>
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#include "kallsyms_internal.h"
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#include "kexec_internal.h"
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/* vmcoreinfo stuff */
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unsigned char *vmcoreinfo_data;
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size_t vmcoreinfo_size;
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u32 *vmcoreinfo_note;
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/* trusted vmcoreinfo, e.g. we can make a copy in the crash memory */
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static unsigned char *vmcoreinfo_data_safecopy;
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Elf_Word *append_elf_note(Elf_Word *buf, char *name, unsigned int type,
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void *data, size_t data_len)
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{
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struct elf_note *note = (struct elf_note *)buf;
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note->n_namesz = strlen(name) + 1;
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note->n_descsz = data_len;
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note->n_type = type;
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buf += DIV_ROUND_UP(sizeof(*note), sizeof(Elf_Word));
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memcpy(buf, name, note->n_namesz);
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buf += DIV_ROUND_UP(note->n_namesz, sizeof(Elf_Word));
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memcpy(buf, data, data_len);
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buf += DIV_ROUND_UP(data_len, sizeof(Elf_Word));
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return buf;
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}
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void final_note(Elf_Word *buf)
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{
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memset(buf, 0, sizeof(struct elf_note));
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}
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static void update_vmcoreinfo_note(void)
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{
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u32 *buf = vmcoreinfo_note;
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if (!vmcoreinfo_size)
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return;
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buf = append_elf_note(buf, VMCOREINFO_NOTE_NAME, 0, vmcoreinfo_data,
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vmcoreinfo_size);
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final_note(buf);
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}
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void crash_update_vmcoreinfo_safecopy(void *ptr)
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{
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if (ptr)
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memcpy(ptr, vmcoreinfo_data, vmcoreinfo_size);
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vmcoreinfo_data_safecopy = ptr;
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}
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void crash_save_vmcoreinfo(void)
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{
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if (!vmcoreinfo_note)
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return;
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/* Use the safe copy to generate vmcoreinfo note if have */
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if (vmcoreinfo_data_safecopy)
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vmcoreinfo_data = vmcoreinfo_data_safecopy;
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vmcoreinfo_append_str("CRASHTIME=%lld\n", ktime_get_real_seconds());
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update_vmcoreinfo_note();
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}
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void vmcoreinfo_append_str(const char *fmt, ...)
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{
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va_list args;
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char buf[0x50];
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size_t r;
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va_start(args, fmt);
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r = vscnprintf(buf, sizeof(buf), fmt, args);
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va_end(args);
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r = min(r, (size_t)VMCOREINFO_BYTES - vmcoreinfo_size);
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memcpy(&vmcoreinfo_data[vmcoreinfo_size], buf, r);
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vmcoreinfo_size += r;
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WARN_ONCE(vmcoreinfo_size == VMCOREINFO_BYTES,
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"vmcoreinfo data exceeds allocated size, truncating");
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}
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/*
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* provide an empty default implementation here -- architecture
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* code may override this
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*/
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void __weak arch_crash_save_vmcoreinfo(void)
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{}
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phys_addr_t __weak paddr_vmcoreinfo_note(void)
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{
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return __pa(vmcoreinfo_note);
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}
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EXPORT_SYMBOL(paddr_vmcoreinfo_note);
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static int __init crash_save_vmcoreinfo_init(void)
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{
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vmcoreinfo_data = (unsigned char *)get_zeroed_page(GFP_KERNEL);
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if (!vmcoreinfo_data) {
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pr_warn("Memory allocation for vmcoreinfo_data failed\n");
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return -ENOMEM;
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}
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vmcoreinfo_note = alloc_pages_exact(VMCOREINFO_NOTE_SIZE,
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GFP_KERNEL | __GFP_ZERO);
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if (!vmcoreinfo_note) {
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free_page((unsigned long)vmcoreinfo_data);
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vmcoreinfo_data = NULL;
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pr_warn("Memory allocation for vmcoreinfo_note failed\n");
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return -ENOMEM;
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}
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VMCOREINFO_OSRELEASE(init_uts_ns.name.release);
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VMCOREINFO_BUILD_ID();
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VMCOREINFO_PAGESIZE(PAGE_SIZE);
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VMCOREINFO_SYMBOL(init_uts_ns);
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VMCOREINFO_OFFSET(uts_namespace, name);
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VMCOREINFO_SYMBOL(node_online_map);
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#ifdef CONFIG_MMU
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VMCOREINFO_SYMBOL_ARRAY(swapper_pg_dir);
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#endif
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VMCOREINFO_SYMBOL(_stext);
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vmcoreinfo_append_str("NUMBER(VMALLOC_START)=0x%lx\n", (unsigned long) VMALLOC_START);
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#ifndef CONFIG_NUMA
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VMCOREINFO_SYMBOL(mem_map);
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VMCOREINFO_SYMBOL(contig_page_data);
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#endif
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#ifdef CONFIG_SPARSEMEM_VMEMMAP
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VMCOREINFO_SYMBOL_ARRAY(vmemmap);
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#endif
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#ifdef CONFIG_SPARSEMEM
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VMCOREINFO_SYMBOL_ARRAY(mem_section);
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VMCOREINFO_LENGTH(mem_section, NR_SECTION_ROOTS);
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VMCOREINFO_STRUCT_SIZE(mem_section);
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VMCOREINFO_OFFSET(mem_section, section_mem_map);
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VMCOREINFO_NUMBER(SECTION_SIZE_BITS);
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VMCOREINFO_NUMBER(MAX_PHYSMEM_BITS);
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#endif
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VMCOREINFO_STRUCT_SIZE(page);
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VMCOREINFO_STRUCT_SIZE(pglist_data);
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VMCOREINFO_STRUCT_SIZE(zone);
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VMCOREINFO_STRUCT_SIZE(free_area);
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VMCOREINFO_STRUCT_SIZE(list_head);
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VMCOREINFO_SIZE(nodemask_t);
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VMCOREINFO_OFFSET(page, flags);
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VMCOREINFO_OFFSET(page, _refcount);
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VMCOREINFO_OFFSET(page, mapping);
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VMCOREINFO_OFFSET(page, lru);
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VMCOREINFO_OFFSET(page, _mapcount);
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VMCOREINFO_OFFSET(page, private);
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VMCOREINFO_OFFSET(page, compound_head);
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VMCOREINFO_OFFSET(pglist_data, node_zones);
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VMCOREINFO_OFFSET(pglist_data, nr_zones);
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#ifdef CONFIG_FLATMEM
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VMCOREINFO_OFFSET(pglist_data, node_mem_map);
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#endif
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VMCOREINFO_OFFSET(pglist_data, node_start_pfn);
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VMCOREINFO_OFFSET(pglist_data, node_spanned_pages);
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VMCOREINFO_OFFSET(pglist_data, node_id);
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VMCOREINFO_OFFSET(zone, free_area);
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VMCOREINFO_OFFSET(zone, vm_stat);
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VMCOREINFO_OFFSET(zone, spanned_pages);
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VMCOREINFO_OFFSET(free_area, free_list);
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VMCOREINFO_OFFSET(list_head, next);
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VMCOREINFO_OFFSET(list_head, prev);
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VMCOREINFO_LENGTH(zone.free_area, NR_PAGE_ORDERS);
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log_buf_vmcoreinfo_setup();
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VMCOREINFO_LENGTH(free_area.free_list, MIGRATE_TYPES);
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VMCOREINFO_NUMBER(NR_FREE_PAGES);
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VMCOREINFO_NUMBER(PG_lru);
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VMCOREINFO_NUMBER(PG_private);
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VMCOREINFO_NUMBER(PG_swapcache);
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VMCOREINFO_NUMBER(PG_swapbacked);
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#define PAGE_SLAB_MAPCOUNT_VALUE (~PG_slab)
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VMCOREINFO_NUMBER(PAGE_SLAB_MAPCOUNT_VALUE);
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#ifdef CONFIG_MEMORY_FAILURE
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VMCOREINFO_NUMBER(PG_hwpoison);
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#endif
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VMCOREINFO_NUMBER(PG_head_mask);
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#define PAGE_BUDDY_MAPCOUNT_VALUE (~PG_buddy)
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VMCOREINFO_NUMBER(PAGE_BUDDY_MAPCOUNT_VALUE);
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#define PAGE_HUGETLB_MAPCOUNT_VALUE (~PG_hugetlb)
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VMCOREINFO_NUMBER(PAGE_HUGETLB_MAPCOUNT_VALUE);
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#define PAGE_OFFLINE_MAPCOUNT_VALUE (~PG_offline)
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VMCOREINFO_NUMBER(PAGE_OFFLINE_MAPCOUNT_VALUE);
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#ifdef CONFIG_KALLSYMS
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VMCOREINFO_SYMBOL(kallsyms_names);
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VMCOREINFO_SYMBOL(kallsyms_num_syms);
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VMCOREINFO_SYMBOL(kallsyms_token_table);
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VMCOREINFO_SYMBOL(kallsyms_token_index);
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VMCOREINFO_SYMBOL(kallsyms_offsets);
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VMCOREINFO_SYMBOL(kallsyms_relative_base);
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#endif /* CONFIG_KALLSYMS */
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arch_crash_save_vmcoreinfo();
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update_vmcoreinfo_note();
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return 0;
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}
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subsys_initcall(crash_save_vmcoreinfo_init);
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