On Thu, May 14, 2020 at 12:08:27PM +0200, John Paul Adrian Glaubitz wrote:
> On 5/14/20 12:04 PM, Christian Brauner wrote:
> > So that's interesting because systemd doesn't support itanium correctly afaict.
> > They have a raw_clone() function that they use which is not tailored to
> > ia64. __NR_clone should be defined as so to hit clone2() but they don't
> > pass a stack size argument down which is invalid on ia64:
> Ah, I wasn't aware of this limitation. I'm surprised the systemd testsuite passes
> then on ia64.
>
> On sparc64, Michael Karcher provided the hand-written assembly you quoted to
> fix the raw_clone() on this architecture.
>
> I assume we could do the same on ia64?
I think the following should be correct:
(Probably worth checking that __NR_clone and __NR_clone2 are the same
for ia64. Also note, that __NR_clone was _never_ supported by glibc on
ia64. They even have this comment:
/* clone is not supported under Linux/ia64, use clone2. */
)
static inline pid_t raw_clone(unsigned long flags) {
pid_t ret;
assert((flags & (CLONE_VM|CLONE_PARENT_SETTID|CLONE_CHILD_SETTID|
CLONE_CHILD_CLEARTID|CLONE_SETTLS)) == 0);
#if defined(__s390x__) || defined(__s390__) || defined(__CRIS__)
/* On s390/s390x and cris the order of the first and second arguments
* of the raw clone() system call is reversed. */
ret = (pid_t) syscall(__NR_clone, NULL, flags);
#elif defined(__sparc__)
{
/**
* sparc always returns the other process id in %o0, and
* a boolean flag whether this is the child or the parent in
* %o1. Inline assembly is needed to get the flag returned
* in %o1.
*/
int in_child, child_pid, error;
asm volatile("mov %3, %%g1\n\t"
"mov %4, %%o0\n\t"
"mov 0 , %%o1\n\t"
#if defined(__arch64__)
"t 0x6d\n\t"
#else
"t 0x10\n\t"
#endif
"addx %%g0, 0, %2\n\t"
"mov %%o1, %0\n\t"
"mov %%o0, %1" :
"=r"(in_child), "=r"(child_pid), "=r"(error) :
"i"(__NR_clone), "r"(flags) :
"%o1", "%o0", "%g1", "cc" );
if (error) {
errno = child_pid;
ret = -1;
} else
ret = in_child ? 0 : child_pid;
}
+#elif defined(__ia64__)
+ /* On ia64 the stack and stack size are passed as separate arguments. */
+ return (pid_t)syscall(__NR_clone, flags, NULL, 0);
+#else
+ return (pid_t)syscall(__NR_clone, flags, NULL);
+#endif
if (ret == 0)
reset_cached_pid();
return ret;
}
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