1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef LINUX_CRASH_CORE_H 3 #define LINUX_CRASH_CORE_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 32 void crash_update_vmcoreinfo_safecopy(void *ptr); 33 void crash_save_vmcoreinfo(void); 34 void arch_crash_save_vmcoreinfo(void); 35 __printf(1, 2) 36 void vmcoreinfo_append_str(const char *fmt, ...); 37 phys_addr_t paddr_vmcoreinfo_note(void); 38 39 #define VMCOREINFO_OSRELEASE(value) \ 40 vmcoreinfo_append_str("OSRELEASE=%s\n", value) 41 #define VMCOREINFO_BUILD_ID(value) \ 42 vmcoreinfo_append_str("BUILD-ID=%s\n", value) 43 #define VMCOREINFO_PAGESIZE(value) \ 44 vmcoreinfo_append_str("PAGESIZE=%ld\n", value) 45 #define VMCOREINFO_SYMBOL(name) \ 46 vmcoreinfo_append_str("SYMBOL(%s)=%lx\n", #name, (unsigned long)&name) 47 #define VMCOREINFO_SYMBOL_ARRAY(name) \ 48 vmcoreinfo_append_str("SYMBOL(%s)=%lx\n", #name, (unsigned long)name) 49 #define VMCOREINFO_SIZE(name) \ 50 vmcoreinfo_append_str("SIZE(%s)=%lu\n", #name, \ 51 (unsigned long)sizeof(name)) 52 #define VMCOREINFO_STRUCT_SIZE(name) \ 53 vmcoreinfo_append_str("SIZE(%s)=%lu\n", #name, \ 54 (unsigned long)sizeof(struct name)) 55 #define VMCOREINFO_OFFSET(name, field) \ 56 vmcoreinfo_append_str("OFFSET(%s.%s)=%lu\n", #name, #field, \ 57 (unsigned long)offsetof(struct name, field)) 58 #define VMCOREINFO_TYPE_OFFSET(name, field) \ 59 vmcoreinfo_append_str("OFFSET(%s.%s)=%lu\n", #name, #field, \ 60 (unsigned long)offsetof(name, field)) 61 #define VMCOREINFO_LENGTH(name, value) \ 62 vmcoreinfo_append_str("LENGTH(%s)=%lu\n", #name, (unsigned long)value) 63 #define VMCOREINFO_NUMBER(name) \ 64 vmcoreinfo_append_str("NUMBER(%s)=%ld\n", #name, (long)name) 65 #define VMCOREINFO_CONFIG(name) \ 66 vmcoreinfo_append_str("CONFIG_%s=y\n", #name) 67 68 extern unsigned char *vmcoreinfo_data; 69 extern size_t vmcoreinfo_size; 70 extern u32 *vmcoreinfo_note; 71 72 /* raw contents of kernel .notes section */ 73 extern const void __start_notes __weak; 74 extern const void __stop_notes __weak; 75 76 Elf_Word *append_elf_note(Elf_Word *buf, char *name, unsigned int type, 77 void *data, size_t data_len); 78 void final_note(Elf_Word *buf); 79 80 int __init parse_crashkernel(char *cmdline, unsigned long long system_ram, 81 unsigned long long *crash_size, unsigned long long *crash_base); 82 int parse_crashkernel_high(char *cmdline, unsigned long long system_ram, 83 unsigned long long *crash_size, unsigned long long *crash_base); 84 int parse_crashkernel_low(char *cmdline, unsigned long long system_ram, 85 unsigned long long *crash_size, unsigned long long *crash_base); 86 87 #endif /* LINUX_CRASH_CORE_H */ 88