[Bug runtime/29076] user_string_quoted() doesn't properly generate strings in .rodata on x86_64 machines

[wcohen at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=29076

--- Comment #3 from William Cohen <wcohen at redhat dot com> ---
That appears to be the case on x86_64.  The question is how to get the syscall
tests to work better.  Have two examples that only differ with where the strcpy
is done.  One result has a pointer and the other prints the string:

[wcohen@fedora x86_ro_string]$ cat acct4.c
#include <unistd.h>
#include <string.h>

char *a="foobar";
char buffer[32];

int main()
{
  acct(a);
  strcpy (&buffer[0], a);
  acct(&buffer[0]);
  acct((char *)-1);
  return 0;
}
[wcohen@fedora x86_ro_string]$ gcc -o acct5 -O2 acct5.c
[wcohen@fedora x86_ro_string]$ sudo stap -c ./acct4 sys_acct.stp 
[sudo] password for wcohen: 
kprobe.function("__x64_sys_acct")?(0x402010)
kprobe.function("__x64_sys_acct")?("foobar")
kprobe.function("__x64_sys_acct")?(0xffffffffffffffff)
[wcohen@fedora x86_ro_string]$ cat acct5.c
#include <unistd.h>
#include <string.h>

char *a="foobar";
char buffer[32];

int main()
{
  strcpy (&buffer[0], a);
  acct(a);
  acct(&buffer[0]);
  acct((char *)-1);
  return 0;
}
[wcohen@fedora x86_ro_string]$ gcc -o acct5 -O2 acct5.c
[wcohen@fedora x86_ro_string]$ sudo stap -c ./acct5 sys_acct.stp 
kprobe.function("__x64_sys_acct")?("foobar")
kprobe.function("__x64_sys_acct")?("foobar")
kprobe.function("__x64_sys_acct")?(0xffffffffffffffff)
[wcohen@fedora x86_ro_string]$

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