Set orig_eax to -1 for Linux x86 platforms

Summary:
For Linux x86 based environments the orig_eax/orig_rax
register should be set to -1 to prevent the instruction pointer
to be decremented, which was the cause for the SIGILL exception.

Fix for Bug 23659

Reviewers: zturner, ashok.thirumurthi, mikesart, jingham, clayborg

Subscribers: clayborg, labath

Differential Revision: http://reviews.llvm.org/D11411

llvm-svn: 244875

1 files changed, 10 insertions, 1 deletions

diff --git a/lldb/source/Plugins/Process/Utility/RegisterContextLinux_i386.cpp b/lldb/source/Plugins/Process/Utility/RegisterContextLinux_i386.cpp
index 4f6bbc8f8ab..de35f591ae2 100644
--- a/lldb/source/Plugins/Process/Utility/RegisterContextLinux_i386.cpp
+++ b/lldb/source/Plugins/Process/Utility/RegisterContextLinux_i386.cpp
@@ -26,7 +26,7 @@ struct GPR
     uint32_t es;
     uint32_t fs;
     uint32_t gs;
-    uint32_t orig_ax;
+    uint32_t orig_eax;
     uint32_t eip;
     uint32_t cs;
     uint32_t eflags;
@@ -98,6 +98,9 @@ struct UserArea
 RegisterContextLinux_i386::RegisterContextLinux_i386(const ArchSpec &target_arch) :
     RegisterInfoInterface(target_arch)
 {
+    RegisterInfo orig_ax = { "orig_eax", NULL, sizeof(((GPR*)NULL)->orig_eax), (LLVM_EXTENSION offsetof(GPR, orig_eax)), eEncodingUint, \
+              eFormatHex, { LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM }, NULL, NULL };
+    d_register_infos.push_back(orig_ax);
 }
 
 size_t
@@ -131,3 +134,9 @@ RegisterContextLinux_i386::GetUserRegisterCount () const
 {
     return static_cast<uint32_t> (k_num_user_registers_i386);
 }
+
+const std::vector<lldb_private::RegisterInfo> *
+RegisterContextLinux_i386::GetDynamicRegisterInfoP() const
+{
+    return &d_register_infos;
+}