1// SPDX-License-Identifier: GPL-2.0
 2#include <linux/elf.h>
 3#include <linux/elfcore.h>
 4#include <linux/coredump.h>
 5#include <linux/fs.h>
 6#include <linux/mm.h>
 7
 8#include <asm/elf.h>
 9
10
11Elf32_Half elf_core_extra_phdrs(struct coredump_params *cprm)
12{
13	return vsyscall_ehdr ? (((struct elfhdr *)vsyscall_ehdr)->e_phnum) : 0;
14}
15
16int elf_core_write_extra_phdrs(struct coredump_params *cprm, loff_t offset)
17{
18	if ( vsyscall_ehdr ) {
19		const struct elfhdr *const ehdrp =
20			(struct elfhdr *) vsyscall_ehdr;
21		const struct elf_phdr *const phdrp =
22			(const struct elf_phdr *) (vsyscall_ehdr + ehdrp->e_phoff);
23		int i;
24		Elf32_Off ofs = 0;
25
26		for (i = 0; i < ehdrp->e_phnum; ++i) {
27			struct elf_phdr phdr = phdrp[i];
28
29			if (phdr.p_type == PT_LOAD) {
30				ofs = phdr.p_offset = offset;
31				offset += phdr.p_filesz;
32			} else {
33				phdr.p_offset += ofs;
34			}
35			phdr.p_paddr = 0; /* match other core phdrs */
36			if (!dump_emit(cprm, &phdr, sizeof(phdr)))
37				return 0;
38		}
39	}
40	return 1;
41}
42
43int elf_core_write_extra_data(struct coredump_params *cprm)
44{
45	if ( vsyscall_ehdr ) {
46		const struct elfhdr *const ehdrp =
47			(struct elfhdr *) vsyscall_ehdr;
48		const struct elf_phdr *const phdrp =
49			(const struct elf_phdr *) (vsyscall_ehdr + ehdrp->e_phoff);
50		int i;
51
52		for (i = 0; i < ehdrp->e_phnum; ++i) {
53			if (phdrp[i].p_type == PT_LOAD) {
54				void *addr = (void *) phdrp[i].p_vaddr;
55				size_t filesz = phdrp[i].p_filesz;
56				if (!dump_emit(cprm, addr, filesz))
57					return 0;
58			}
59		}
60	}
61	return 1;
62}
63
64size_t elf_core_extra_data_size(struct coredump_params *cprm)
65{
66	if ( vsyscall_ehdr ) {
67		const struct elfhdr *const ehdrp =
68			(struct elfhdr *)vsyscall_ehdr;
69		const struct elf_phdr *const phdrp =
70			(const struct elf_phdr *) (vsyscall_ehdr + ehdrp->e_phoff);
71		int i;
72
73		for (i = 0; i < ehdrp->e_phnum; ++i)
74			if (phdrp[i].p_type == PT_LOAD)
75				return (size_t) phdrp[i].p_filesz;
76	}
77	return 0;
78}