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