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zdump: dfi_elf: refactor read_elf_(ehdr|phdrs)

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Make the function unit testable and easier to reuse - no functional change.

Signed-off-by: Marc Hartmayer <mhartmay@linux.ibm.com>
Reviewed-by: Steffen Eiden <seiden@linux.ibm.com>
Reviewed-by: Alexander Egorenkov <egorenar@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
This commit is contained in:
Marc Hartmayer
2021-11-15 09:52:20 +01:00
committed by Jan Höppner
parent ff3fe4bf43
commit 8944c2f60d
3 changed files with 51 additions and 16 deletions
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28
zdump/df_elf.c
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@@ -7,6 +7,8 @@
#include <string.h>
#include "lib/util_libc.h"
#include "df_elf.h"
void *ehdr_init(Elf64_Ehdr *ehdr, Elf64_Half phnum)
@@ -50,6 +52,32 @@ bool ehdr_is_s390x(const Elf64_Ehdr *ehdr)
ehdr->e_ident[EI_CLASS] == ELFCLASS64;
}
int read_elf_hdr(const struct zg_fh *fh, Elf64_Ehdr *ehdr)
{
const size_t ehdr_size = sizeof(*ehdr);
if (zg_size(fh) < ehdr_size)
return -1;
zg_read(fh, ehdr, ehdr_size, ZG_CHECK);
return 0;
}
Elf64_Phdr *read_elf_phdrs(const struct zg_fh *fh, const Elf64_Ehdr *ehdr, unsigned int *phdr_count)
{
const Elf64_Half phnum = ehdr->e_phnum;
size_t phdrs_size;
Elf64_Phdr *phdrs;
/* Cannot wraparound since `Elf64_Half`` is `uint16_t` */
phdrs_size = sizeof(*phdrs) * phnum;
phdrs = util_malloc(phdrs_size);
zg_seek(fh, ehdr->e_phoff, ZG_CHECK);
zg_read(fh, phdrs, phdrs_size, ZG_CHECK);
*phdr_count = phnum;
return phdrs;
}
void *nt_init(void *buf, Elf64_Word type, const void *desc, int d_len,
const char *name)
{