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Add build option to disable usage of scv on powerpc

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Commit 68ab82f566 added support for the scv
syscall ABI on powerpc.  Since then systems that have kernel and processor
support started using scv.  However adding the proper support for a new syscall
ABI requires changes to several other projects (e.g. qemu, valgrind, strace,
kernel), which are gradually receiving support.

Meanwhile, having a way to disable scv on glibc at build time can be useful for
distros that may encounter conflicts with projects that still do not support the
scv ABI, buying time until proper support is added.

This commit adds a --disable-scv option that disables scv support and uses sc
for all syscalls, like before commit 68ab82f566.

Reviewed-by: Raphael M Zinsly <rzinsly@linux.ibm.com>
This commit is contained in:
Matheus Castanho
2021-04-09 14:47:27 -03:00
parent acc85ea1eb
commit ebae2f5a6f
10 changed files with 59 additions and 13 deletions
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2
sysdeps/unix/sysv/linux/powerpc/sysdep.h
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@ -125,7 +125,7 @@
/* When inside the dynamic loader, the thread pointer may not have been
initialized yet, so don't check for scv support in that case. */
# if !IS_IN(rtld)
# if defined(USE_PPC_SCV) && !IS_IN(rtld)
# undef TRY_SYSCALL_SCV
# define TRY_SYSCALL_SCV(nr) \
CHECK_THREAD_POINTER && THREAD_GET_HWCAP() & PPC_FEATURE2_SCV ? \