From: Satoshi Tanda <tanda.sat@gmail.com>
Date: Mon, 24 May 2021 04:50:18 +0000 (+0800)
Subject: MdePkg/BaseLib: Fix AsmReadSs() with GCC toolchain
X-Git-Tag: edk2-stable202108~250
X-Git-Url: https://git.proxmox.com/?p=mirror_edk2.git;a=commitdiff_plain;h=c410ad4da4b7785170d3d42a3ba190c2caac6feb

MdePkg/BaseLib: Fix AsmReadSs() with GCC toolchain

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3405

AsmReadSs() in Ia32/GccInlinePriv.c and X64/GccInlinePriv.c return the
DS segment selector value instead of SS.

Signed-off-by: Satoshi Tanda <tanda.sat@gmail.com>
Reviewed-by: Liming Gao <gaoliming@byosoft.com.cn>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
---

diff --git a/MdePkg/Library/BaseLib/Ia32/GccInlinePriv.c b/MdePkg/Library/BaseLib/Ia32/GccInlinePriv.c
index 40e8c08beb..b8b5b85e73 100644
--- a/MdePkg/Library/BaseLib/Ia32/GccInlinePriv.c
+++ b/MdePkg/Library/BaseLib/Ia32/GccInlinePriv.c
@@ -902,7 +902,7 @@ AsmReadSs (
   UINT16  Data;
 
   __asm__ __volatile__ (
-    "mov  %%ds, %0"
+    "mov  %%ss, %0"
     :"=a" (Data)
     );
 
diff --git a/MdePkg/Library/BaseLib/X64/GccInlinePriv.c b/MdePkg/Library/BaseLib/X64/GccInlinePriv.c
index 244bd62ee6..c3feb9f922 100644
--- a/MdePkg/Library/BaseLib/X64/GccInlinePriv.c
+++ b/MdePkg/Library/BaseLib/X64/GccInlinePriv.c
@@ -911,7 +911,7 @@ AsmReadSs (
   UINT16  Data;
 
   __asm__ __volatile__ (
-    "mov  %%ds, %0"
+    "mov  %%ss, %0"
     :"=a" (Data)
     );