Blame glibc-upstream-2.33-41.patch
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commit 0ef0e6de7fdfa18328b09ba2afb4f0112d4bdab4
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Author: Nicholas Piggin <npiggin@gmail.com>
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Date: Thu May 20 11:00:36 2021 -0300
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powerpc: Fix handling of scv return error codes [BZ #27892]
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When using scv for templated ASM syscalls, current code interprets any
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negative return value as error, but the only valid error codes are in
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the range -4095..-1 according to the ABI.
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This commit also fixes 'signal.gen.test' strace test, where the issue
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was first identified.
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Reviewed-by: Matheus Castanho <msc@linux.ibm.com>
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(cherry picked from commit 7de36744ee1325f35d3fe0ca079dd33c40b12267)
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diff --git a/sysdeps/powerpc/powerpc64/sysdep.h b/sysdeps/powerpc/powerpc64/sysdep.h
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index c57bb1c05d02f663..1ea4c3b917295168 100644
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--- a/sysdeps/powerpc/powerpc64/sysdep.h
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+++ b/sysdeps/powerpc/powerpc64/sysdep.h
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@@ -398,8 +398,9 @@ LT_LABELSUFFIX(name,_name_end): ; \
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#endif
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#define RET_SCV \
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- cmpdi r3,0; \
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- bgelr+; \
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+ li r9,-4095; \
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+ cmpld r3,r9; \
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+ bltlr+; \
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neg r3,r3;
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#define RET_SC \
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