| 1 | |
| 2 | #include <linux/kernel.h>
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| 3 | #include <linux/crash_dump.h>
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| 4 | #include <linux/init.h>
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| 5 | #include <linux/errno.h>
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| 6 | #include <linux/export.h>
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| 7 |
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| 8 | |
| 9 | * stores the physical address of elf header of crash image
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| 10 | *
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| 11 | * Note: elfcorehdr_addr is not just limited to vmcore. It is also used by
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| 12 | * is_kdump_kernel() to determine if we are booting after a panic. Hence put
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| 13 | * it under CONFIG_CRASH_DUMP and not CONFIG_PROC_VMCORE.
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| 14 |
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| 15 | unsigned long long elfcorehdr_addr = ELFCORE_ADDR_MAX;
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| 16 | EXPORT_SYMBOL_GPL(elfcorehdr_addr);
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| 17 |
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| 18 | |
| 19 | * stores the size of elf header of crash image
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| 20 |
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| 21 | unsigned long long elfcorehdr_size;
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| 22 |
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| 23 | |
| 24 | * elfcorehdr= specifies the location of elf core header stored by the crashed
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| 25 | * kernel. This option will be passed by kexec loader to the capture kernel.
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| 26 | *
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| 27 | * Syntax: elfcorehdr=[size[KMG]@]offset[KMG]
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| 28 |
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| 29 | static int __init setup_elfcorehdr(char *arg)
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| 30 | {
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| 31 | char *end;
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| 32 | if (!arg)
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| 33 | return -EINVAL;
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| 34 | elfcorehdr_addr = memparse(arg, &end);
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| 35 | if (*end == '@') {
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| 36 | elfcorehdr_size = elfcorehdr_addr;
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| 37 | elfcorehdr_addr = memparse(end + 1, &end);
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| 38 | }
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| 39 | return end > arg ? 0 : -EINVAL;
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| 40 | }
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| 41 | early_param("elfcorehdr", setup_elfcorehdr);
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