From: Andreas Arnez <arnez@linux.ibm.com>
Date: Wed, 13 Mar 2024 16:47:59 +0000 (+0100)
Subject: s390x: Fix definedness of syscall return value register
X-Git-Tag: VALGRIND_3_23_0~118
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=2106806185cb2ff3177b66d319d23c41cd668ad6;p=thirdparty%2Fvalgrind.git

s390x: Fix definedness of syscall return value register

The memcheck test case for the close_range syscall showed that Valgrind on
s390x doesn't correctly set the definedness of the return value register
after having invoked a system call.  Fix this.
---

diff --git a/coregrind/m_syswrap/syswrap-main.c b/coregrind/m_syswrap/syswrap-main.c
index 20d02c7fa..eae3f8a62 100644
--- a/coregrind/m_syswrap/syswrap-main.c
+++ b/coregrind/m_syswrap/syswrap-main.c
@@ -1562,6 +1562,8 @@ void putSyscallStatusIntoGuestState ( /*IN*/ ThreadId tid,
    } else {
       gst->guest_r2 = sr_Res(canonical->sres);
    }
+   VG_TRACK( post_reg_write, Vg_CoreSysCall, tid,
+             OFFSET_s390x_r2, sizeof(UWord) );
 
 #  elif defined(VGP_mips32_linux)
    VexGuestMIPS32State* gst = (VexGuestMIPS32State*)gst_vanilla;