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powerpc64: Add the clone3 wrapper

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It follows the internal signature:

  extern int clone3 (struct clone_args *__cl_args, size_t __size,
 int (*__func) (void *__arg), void *__arg);

The powerpc64 ABI requires an initial stackframe so the child can
store/restore the TOC.  It is create prior calling clone3 by
adjusting the stack size (since kernel will compute the stack as
stack plus size).

Checked on powerpc64-linux-gnu (power8, kernel 6.0) and
powerpc64le-linux-gnu (power9, kernel 4.18).
Reviewed-by: Paul E. Murphy <murphyp@linux.ibm.com>
This commit is contained in:
Adhemerval Zanella Netto
2023-02-03 14:12:33 -03:00
committed by Adhemerval Zanella
parent fb95c31638
commit 16e424a325
2 changed files with 158 additions and 0 deletions
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sysdeps/unix/sysv/linux/powerpc/sysdep.h
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@@ -214,6 +214,7 @@
#if defined(__PPC64__) || defined(__powerpc64__)
#define HAVE_CLOCK_GETRES64_VSYSCALL "__kernel_clock_getres"
#define HAVE_CLOCK_GETTIME64_VSYSCALL "__kernel_clock_gettime"
#define HAVE_CLONE3_WRAPPER 1
#else
#define HAVE_CLOCK_GETRES_VSYSCALL "__kernel_clock_getres"
#define HAVE_CLOCK_GETTIME_VSYSCALL "__kernel_clock_gettime"