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powerpc64: Fix calls when r2 is not used [BZ #26173]

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Teach the linker that __mcount_internal, __sigjmp_save_symbol,
__syscall_error and __GI_exit do not use r2, so that it does not need to
recover r2 after the call.

Test at configure time if the assembler supports @notoc and define
USE_PPC64_NOTOC.
This commit is contained in:
Tulio Magno Quites Machado Filho
2020-07-10 19:41:06 -03:00
parent 936c9666ae
commit 7c7bcf3634
7 changed files with 52 additions and 4 deletions
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2
sysdeps/unix/sysv/linux/powerpc/powerpc64/makecontext.S
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@ -160,7 +160,7 @@ L(exitcode):
li r3,-1
L(do_exit):
#ifdef SHARED
b JUMPTARGET(__GI_exit);
b JUMPTARGET (NOTOC (__GI_exit));
#else
b JUMPTARGET(exit);
nop