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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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zdump/dfi_elf.c
+10 -16
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@@ -280,15 +280,8 @@ static int pt_notes_add(Elf64_Phdr *phdr)
return 0;
}
/*
* Read ELF header
*/
static int read_elf_hdr(Elf64_Ehdr *ehdr)
static int check_elf_hdr(const Elf64_Ehdr *ehdr)
{
if (zg_size(g.fh) < sizeof(*ehdr))
return -ENODEV;
zg_read(g.fh, ehdr, sizeof(*ehdr), ZG_CHECK);
if (!ehdr_is_elf_object(ehdr) || !ehdr_is_vmcore(ehdr))
return -ENODEV;
if (!ehdr_is_s390x(ehdr))
@@ -301,24 +294,25 @@ static int read_elf_hdr(Elf64_Ehdr *ehdr)
*/
static int dfi_elf_init(void)
{
Elf64_Ehdr ehdr;
unsigned int phnum, i;
Elf64_Phdr *phdr;
int i;
Elf64_Ehdr ehdr;
util_log_print(UTIL_LOG_DEBUG, "DFI ELF initialization\n");
if (read_elf_hdr(&ehdr) != 0)
if (read_elf_hdr(g.fh, &ehdr) != 0)
return -ENODEV;
if (check_elf_hdr(&ehdr) < 0)
return -ENODEV;
df_elf_ensure_s390x();
dfi_arch_set(DFI_ARCH_64);
dfi_cpu_info_init(DFI_CPU_CONTENT_ALL);
phdr = util_malloc(sizeof(*phdr) * ehdr.e_phnum);
zg_seek(g.fh, ehdr.e_phoff, ZG_CHECK);
zg_read(g.fh, phdr, sizeof(*phdr) * ehdr.e_phnum, ZG_CHECK);
util_log_print(UTIL_LOG_DEBUG, "DFI ELF e_phnum %u\n", ehdr.e_phnum);
for (i = 0; i < ehdr.e_phnum; i++) {
phdr = read_elf_phdrs(g.fh, &ehdr, &phnum);
util_log_print(UTIL_LOG_DEBUG, "DFI ELF e_phnum %u\n", phnum);
for (i = 0; i < phnum; i++) {
util_log_print(UTIL_LOG_DEBUG, "DFI ELF p_type[%d] 0x%lx\n",
i, phdr[i].p_type);
switch (phdr[i].p_type) {