[lldb] [Process/NetBSD] Fix reading FIP/FDP registers

Fix reading FIP/FDP registers to correctly return segment and offset
parts.  On amd64, this roughly matches the Linux behavior of splitting
the 64-bit FIP/FDP into two halves, and putting the higher 32 bits
into f*seg and lower into f*off.  Well, actually we use only 16 bits
of higher half but the CPUs do not seem to handle more than that anyway.

Differential Revision: https://reviews.llvm.org/D88681

diff --git a/lldb/source/Plugins/Process/NetBSD/NativeRegisterContextNetBSD_x86_64.cpp b/lldb/source/Plugins/Process/NetBSD/NativeRegisterContextNetBSD_x86_64.cpp
index af8b2a2..089ae4f 100644 (file)
--- a/lldb/source/Plugins/Process/NetBSD/NativeRegisterContextNetBSD_x86_64.cpp
+++ b/lldb/source/Plugins/Process/NetBSD/NativeRegisterContextNetBSD_x86_64.cpp
@@ -657,13 +657,13 @@ NativeRegisterContextNetBSD_x86_64::ReadRegister(const RegisterInfo *reg_info,
     reg_value = (uint64_t)m_fpr.fxstate.fx_opcode;
     break;
   case lldb_fiseg_x86_64:
-    reg_value = (uint64_t)m_fpr.fxstate.fx_ip.fa_64;
+    reg_value = (uint32_t)m_fpr.fxstate.fx_ip.fa_32.fa_seg;
     break;
   case lldb_fioff_x86_64:
     reg_value = (uint32_t)m_fpr.fxstate.fx_ip.fa_32.fa_off;
     break;
   case lldb_foseg_x86_64:
-    reg_value = (uint64_t)m_fpr.fxstate.fx_dp.fa_64;
+    reg_value = (uint32_t)m_fpr.fxstate.fx_dp.fa_32.fa_seg;
     break;
   case lldb_fooff_x86_64:
     reg_value = (uint32_t)m_fpr.fxstate.fx_dp.fa_32.fa_off;
@@ -945,13 +945,13 @@ Status NativeRegisterContextNetBSD_x86_64::WriteRegister(
     m_fpr.fxstate.fx_opcode = reg_value.GetAsUInt16();
     break;
   case lldb_fiseg_x86_64:
-    m_fpr.fxstate.fx_ip.fa_64 = reg_value.GetAsUInt64();
+    m_fpr.fxstate.fx_ip.fa_32.fa_seg = reg_value.GetAsUInt32();
     break;
   case lldb_fioff_x86_64:
     m_fpr.fxstate.fx_ip.fa_32.fa_off = reg_value.GetAsUInt32();
     break;
   case lldb_foseg_x86_64:
-    m_fpr.fxstate.fx_dp.fa_64 = reg_value.GetAsUInt64();
+    m_fpr.fxstate.fx_dp.fa_32.fa_seg = reg_value.GetAsUInt32();
     break;
   case lldb_fooff_x86_64:
     m_fpr.fxstate.fx_dp.fa_32.fa_off = reg_value.GetAsUInt32();