> my init is a very simple program like below
>
> #include <stdio.h>
> int main()
> {
> printf("hello world\n");
> sleep(999999);
> return 0;
> }
> And my init is static build with "-static" option and I use
> cross-objdump to read it and it doesn't tell me there are any library
> it depends on.
Dear all:
I find there is some problem about kernel setting to support loading
static/dynamic elf format.
I study the kernel source and find my error comes from
search_binary_handler and it return -8, -ENOEXEC, while executing,
fmt->load_binary.
In kernel source, the core_initcall will register different
init_elf_xxxfmt, and it seems this option will determine whether
kernel support dynamic or static elf execute files.
And kernel seems support these binfmts:
binfmt_aout.c:static struct linux_binfmt aout_format = {
binfmt_elf.c:static struct linux_binfmt elf_format = {
binfmt_elf_fdpic.c:static struct linux_binfmt elf_fdpic_format = {
binfmt_em86.c:static struct linux_binfmt em86_format = {
binfmt_flat.c:static struct linux_binfmt flat_format = {
binfmt_misc.c:static struct linux_binfmt misc_format = {
binfmt_script.c:static struct linux_binfmt script_format = {
binfmt_som.c:static struct linux_binfmt som_format = {
And I check my fs folder and I only see this *.o files:
-rw-r--r-- 1 root root 2748 2009-01-23 11:42 binfmt_script.o
which is the default binfmt that will support.
My questions are:
1. are my assumptions above correct? take my static build init for
example, should I check whether static binary elf support code has
build in my kernel?
2. if my assumption correct, which one in the list is my choice and
what config I should add in my uclinxu kernel config?
3. if my assumption above is wrong and kernel will default support
static elf file, why I get -8, -ENOEXEC, while calling
fmt->load_binary.
4. There is only binfmt_script.o build in my kernel, but why in try=2
loop in search_binary_handler, I still get 2 fmt->load_binarys. There
should only be 1 fmt->load_binary, load_script in Binfmt_script.c.
appreciate your help,
miloody
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