X86: Change FTAG register size in FXSAVE structure

Summary:
 - Changed from 16 bits to 8 bits for Intel Architecture
    -- FXSAVE structure now conforms with the layout of FXSAVE
       area specified by IA Architecture Software Developer Manual

 - Modified Linux and FreeBSD specific files to support this change
    -- MacOSX already uses 8 bits for ftag register

 - Modified TestRegisters.py and a.cpp:
    -- Change allows 8 bit comparison of ftag values

    -- Change resolves Bug 24733:
       Removed XFAIL for Clang as the test works and passes for
       Clang compiler as well

    -- Change provides a Generic/Better way of testing Bug 24457
       and Bug 25050 by using 'int3' inline assembly in inferior

Signed-off-by: Abhishek Aggarwal <abhishek.a.aggarwal@intel.com>

Reviewers: ovyalov, jingham, clayborg

Subscribers: tfiala, emaste

Differential Revision: http://reviews.llvm.org/D13587

llvm-svn: 250022

1 files changed, 6 insertions, 0 deletions

diff --git a/lldb/source/Plugins/Process/Linux/NativeRegisterContextLinux_x86_64.cpp b/lldb/source/Plugins/Process/Linux/NativeRegisterContextLinux_x86_64.cpp
index c656b820d65..1ee8e923188 100755
--- a/lldb/source/Plugins/Process/Linux/NativeRegisterContextLinux_x86_64.cpp
+++ b/lldb/source/Plugins/Process/Linux/NativeRegisterContextLinux_x86_64.cpp
@@ -575,6 +575,9 @@ NativeRegisterContextLinux_x86_64::ReadRegister (const RegisterInfo *reg_info, R
     uint8_t *src = (uint8_t *)&m_fpr + reg_info->byte_offset - m_fctrl_offset_in_userarea;
     switch (reg_info->byte_size)
     {
+        case 1:
+            reg_value.SetUInt8(*(uint8_t *)src);
+            break;
         case 2:
             reg_value.SetUInt16(*(uint16_t *)src);
             break;
@@ -644,6 +647,9 @@ NativeRegisterContextLinux_x86_64::WriteRegister (const RegisterInfo *reg_info,
             uint8_t *dst = (uint8_t *)&m_fpr + reg_info->byte_offset - m_fctrl_offset_in_userarea;
             switch (reg_info->byte_size)
             {
+                case 1:
+                    *(uint8_t *)dst = reg_value.GetAsUInt8();
+                    break;
                 case 2:
                     *(uint16_t *)dst = reg_value.GetAsUInt16();
                     break;