tree 999a0bcdbcfbb60662b65df1658c6072c4a30e5c
parent 20221e9ec1722a063dbc41752ea97fd60c9e8361
author Paul E. Murphy <murp@ibm.com> 1600197508 -0500
committer Ian Lance Taylor <iant@golang.org> 1600369936 +0000

libgo: fix ptrace syscall hooks into glibc

ptrace is actually declared as a variadic function.  On ppc64le
the ABI requires to the caller to allocate space for the parameters
and allows the caller to modify them.

On ppc64le, depending on how and what version of GCC is used,
it will save to parameter save area.  This happened to clobber
a saved LR, and caused syscall.TestExecPtrace to fail with a timeout
when the tracee segfaults, and waits for the parent process to inspect.

Wrap this function to avoid directly calling glibc's ptrace from go.

Fixes golang/go#36698

Change-Id: I594462fa9791905503b60660f7da1dae42f204d2
Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/254755
Trust: Lynn Boger <laboger@linux.vnet.ibm.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>