commit 0ef0e6de7fdfa18328b09ba2afb4f0112d4bdab4
Author: Nicholas Piggin <npiggin@gmail.com>
Date:   Thu May 20 11:00:36 2021 -0300

    powerpc: Fix handling of scv return error codes [BZ #27892]
    
    When using scv for templated ASM syscalls, current code interprets any
    negative return value as error, but the only valid error codes are in
    the range -4095..-1 according to the ABI.
    
    This commit also fixes 'signal.gen.test' strace test, where the issue
    was first identified.
    
    Reviewed-by: Matheus Castanho <msc@linux.ibm.com>
    (cherry picked from commit 7de36744ee1325f35d3fe0ca079dd33c40b12267)

diff --git a/sysdeps/powerpc/powerpc64/sysdep.h b/sysdeps/powerpc/powerpc64/sysdep.h
index c57bb1c05d02f663..1ea4c3b917295168 100644
--- a/sysdeps/powerpc/powerpc64/sysdep.h
+++ b/sysdeps/powerpc/powerpc64/sysdep.h
@@ -398,8 +398,9 @@ LT_LABELSUFFIX(name,_name_end): ; \
 #endif
 
 #define RET_SCV \
-    cmpdi r3,0; \
-    bgelr+; \
+    li r9,-4095; \
+    cmpld r3,r9; \
+    bltlr+; \
     neg r3,r3;
 
 #define RET_SC \