On Thu, 19 May 2005, Steven Rostedt wrote:
On Thu, 2005-05-19 at 16:06 +0200, Andreas Schwab wrote:
"Richard B. Johnson" <[email protected]> writes:
Now, where is that 'auxiliary vevtor'??? I got a pointer to
something to be executed before calling exit, I have an
argument count, then a bunch of pointers (argv), terminating
with a NULL, then another bunch of pointers (envp) terminating
with a NULL. Is there something after that??? If so, what's
the contents of this thing?
See create_elf_tables. The aux table comes after the environment.
As I stated earlier, the page size passed in there is ELF_EXEC_PAGESIZE
which may not be the same as PAGE_SIZE.
-- Steve
It's also hard to see what is happening in 'C'. When I execute
this:
#include <stdio.h>
#include <stdlib.h>
int main(int cnt, char *argv[], char *env[], char *aux[])
{
printf("Aux 0 = %s\n", aux[0]);
// printf("Aux 1 = %s\n", aux[1]);
}
I get:
Aux 0 = GLIBC_2.0
The next pointer is a NULL pointer, so 'C' has dorked something.
When I play in assembler, (crt.o startup) I get a pointer that
points to:
bffffb6c - pointer of the stack
00000020 - dereferenced
This shows that ld-linux.so, that got called first, didn't
preserve the vector.
Cheers,
Dick Johnson
Penguin : Linux version 2.6.11.9 on an i686 machine (5537.79 BogoMips).
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