1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef LINUX_VMCORE_INFO_H 3 #define LINUX_VMCORE_INFO_H 4 5 #include <linux/linkage.h> 6 #include <linux/elfcore.h> 7 #include <linux/elf.h> 8 9 #define CRASH_CORE_NOTE_NAME "CORE" 10 #define CRASH_CORE_NOTE_HEAD_BYTES ALIGN(sizeof(struct elf_note), 4) 11 #define CRASH_CORE_NOTE_NAME_BYTES ALIGN(sizeof(CRASH_CORE_NOTE_NAME), 4) 12 #define CRASH_CORE_NOTE_DESC_BYTES ALIGN(sizeof(struct elf_prstatus), 4) 13 14 /* 15 * The per-cpu notes area is a list of notes terminated by a "NULL" 16 * note header. For kdump, the code in vmcore.c runs in the context 17 * of the second kernel to combine them into one note. 18 */ 19 #define CRASH_CORE_NOTE_BYTES ((CRASH_CORE_NOTE_HEAD_BYTES * 2) + \ 20 CRASH_CORE_NOTE_NAME_BYTES + \ 21 CRASH_CORE_NOTE_DESC_BYTES) 22 23 #define VMCOREINFO_BYTES PAGE_SIZE 24 #define VMCOREINFO_NOTE_NAME "VMCOREINFO" 25 #define VMCOREINFO_NOTE_NAME_BYTES ALIGN(sizeof(VMCOREINFO_NOTE_NAME), 4) 26 #define VMCOREINFO_NOTE_SIZE ((CRASH_CORE_NOTE_HEAD_BYTES * 2) + \ 27 VMCOREINFO_NOTE_NAME_BYTES + \ 28 VMCOREINFO_BYTES) 29 30 typedef u32 note_buf_t[CRASH_CORE_NOTE_BYTES/4]; 31 /* Per cpu memory for storing cpu states in case of system crash. */ 32 extern note_buf_t __percpu *crash_notes; 33 34 void crash_update_vmcoreinfo_safecopy(void *ptr); 35 void crash_save_vmcoreinfo(void); 36 void arch_crash_save_vmcoreinfo(void); 37 __printf(1, 2) 38 void vmcoreinfo_append_str(const char *fmt, ...); 39 phys_addr_t paddr_vmcoreinfo_note(void); 40 41 #define VMCOREINFO_OSRELEASE(value) \ 42 vmcoreinfo_append_str("OSRELEASE=%s\n", value) 43 #define VMCOREINFO_BUILD_ID() \ 44 ({ \ 45 static_assert(sizeof(vmlinux_build_id) == 20); \ 46 vmcoreinfo_append_str("BUILD-ID=%20phN\n", vmlinux_build_id); \ 47 }) 48 49 #define VMCOREINFO_PAGESIZE(value) \ 50 vmcoreinfo_append_str("PAGESIZE=%ld\n", value) 51 #define VMCOREINFO_SYMBOL(name) \ 52 vmcoreinfo_append_str("SYMBOL(%s)=%lx\n", #name, (unsigned long)&name) 53 #define VMCOREINFO_SYMBOL_ARRAY(name) \ 54 vmcoreinfo_append_str("SYMBOL(%s)=%lx\n", #name, (unsigned long)name) 55 #define VMCOREINFO_SIZE(name) \ 56 vmcoreinfo_append_str("SIZE(%s)=%lu\n", #name, \ 57 (unsigned long)sizeof(name)) 58 #define VMCOREINFO_STRUCT_SIZE(name) \ 59 vmcoreinfo_append_str("SIZE(%s)=%lu\n", #name, \ 60 (unsigned long)sizeof(struct name)) 61 #define VMCOREINFO_OFFSET(name, field) \ 62 vmcoreinfo_append_str("OFFSET(%s.%s)=%lu\n", #name, #field, \ 63 (unsigned long)offsetof(struct name, field)) 64 #define VMCOREINFO_TYPE_OFFSET(name, field) \ 65 vmcoreinfo_append_str("OFFSET(%s.%s)=%lu\n", #name, #field, \ 66 (unsigned long)offsetof(name, field)) 67 #define VMCOREINFO_LENGTH(name, value) \ 68 vmcoreinfo_append_str("LENGTH(%s)=%lu\n", #name, (unsigned long)value) 69 #define VMCOREINFO_NUMBER(name) \ 70 vmcoreinfo_append_str("NUMBER(%s)=%ld\n", #name, (long)name) 71 #define VMCOREINFO_CONFIG(name) \ 72 vmcoreinfo_append_str("CONFIG_%s=y\n", #name) 73 74 extern unsigned char *vmcoreinfo_data; 75 extern size_t vmcoreinfo_size; 76 extern u32 *vmcoreinfo_note; 77 78 Elf_Word *append_elf_note(Elf_Word *buf, char *name, unsigned int type, 79 void *data, size_t data_len); 80 void final_note(Elf_Word *buf); 81 #endif /* LINUX_VMCORE_INFO_H */ 82