From 44d07fcc7c610730950e7e914e9e3bfb6736e65e Mon Sep 17 00:00:00 2001
From: Jaydeep Patil <jaydeep.patil@imgtec.com>
Date: Tue, 22 Sep 2015 06:36:56 +0000
Subject: [LLDB][MIPS] microMIPS breakpoints, disassembly and compressed
 addresses     SUMMARY:     This patch detects microMIPS symbols, sets
 breakpoints using un-compressed address and     display disassembly in mixed
 mode for microMIPS applications (running on bare-iron targets).

    Reviewers: clayborg
    Subscribers: nitesh.jain, mohit.bhakkad, sagar, bhushan and lldb-commits
    Differential Revision: http://reviews.llvm.org/D12079

llvm-svn: 248248
---
 .../Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp   | 25 +++++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

(limited to 'lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp')

diff --git a/lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp b/lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp
index cdb1798f4e2..43c3d7676ec 100644
--- a/lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp
+++ b/lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp
@@ -1110,6 +1110,7 @@ struct ParseDWARFLineTableCallbackInfo
 {
     LineTable* line_table;
     std::unique_ptr<LineSequence> sequence_ap;
+    lldb::addr_t addr_mask;
 };
 
 //----------------------------------------------------------------------
@@ -1139,7 +1140,7 @@ ParseDWARFLineTableCallback(dw_offset_t offset, const DWARFDebugLine::State& sta
             assert(info->sequence_ap.get());
         }
         line_table->AppendLineEntryToSequence (info->sequence_ap.get(),
-                                               state.address,
+                                               state.address & info->addr_mask,
                                                state.line,
                                                state.column,
                                                state.file,
@@ -1179,6 +1180,28 @@ SymbolFileDWARF::ParseCompileUnitLineTable (const SymbolContext &sc)
                 {
                     ParseDWARFLineTableCallbackInfo info;
                     info.line_table = line_table_ap.get();
+
+                    /*
+                     * MIPS:
+                     * The SymbolContext may not have a valid target, thus we may not be able
+                     * to call Address::GetOpcodeLoadAddress() which would clear the bit #0
+                     * for MIPS. Use ArchSpec to clear the bit #0.
+                    */
+                    ArchSpec arch;
+                    GetObjectFile()->GetArchitecture(arch);
+                    switch (arch.GetMachine())
+                    {
+                    case llvm::Triple::mips:
+                    case llvm::Triple::mipsel:
+                    case llvm::Triple::mips64:
+                    case llvm::Triple::mips64el:
+                        info.addr_mask = ~((lldb::addr_t)1);
+                        break;
+                    default:
+                        info.addr_mask = ~((lldb::addr_t)0);
+                        break;
+                    }
+
                     lldb::offset_t offset = cu_line_offset;
                     DWARFDebugLine::ParseStatementTable(get_debug_line_data(), &offset, ParseDWARFLineTableCallback, &info);
                     if (m_debug_map_symfile)
-- 
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