Remove hardcoded registers from Hexagon ABI

Summary: The Hexagon ABI plugin uses hardcoded registers when setting up function calls. This is OK for the Hexagon simulator, but the register numbers are different on the gdbserver running on hardware. Change the hardcoded registers to LLDB generic registers.

Reviewers: clayborg

Subscribers: lldb-commits

Differential Revision: http://reviews.llvm.org/D15457

llvm-svn: 255374

diff --git a/lldb/source/Plugins/ABI/SysV-hexagon/ABISysV_hexagon.cpp b/lldb/source/Plugins/ABI/SysV-hexagon/ABISysV_hexagon.cpp
index e7943b9..0c8aae3 100644 (file)
--- a/lldb/source/Plugins/ABI/SysV-hexagon/ABISysV_hexagon.cpp
+++ b/lldb/source/Plugins/ABI/SysV-hexagon/ABISysV_hexagon.cpp
@@ -226,7 +226,7 @@ ABISysV_hexagon::PrepareTrivialCall ( Thread &thread,
 //  . handle 64bit values and their register / stack requirements
 
 */
-#define HEX_ABI_DEBUG 1
+#define HEX_ABI_DEBUG 0
 bool
 ABISysV_hexagon::PrepareTrivialCall ( Thread &thread, 
                                       lldb::addr_t  sp  , 
@@ -242,6 +242,23 @@ ABISysV_hexagon::PrepareTrivialCall ( Thread &thread,
     // grab the process so we have access to the memory for spilling
     lldb::ProcessSP proc = thread.GetProcess( );
 
+    // get the register context for modifying all of the registers
+    RegisterContext *reg_ctx = thread.GetRegisterContext().get();
+    if (!reg_ctx)
+        return false;
+    
+    uint32_t pc_reg = reg_ctx->ConvertRegisterKindToRegisterNumber(eRegisterKindGeneric, LLDB_REGNUM_GENERIC_PC);
+    if (pc_reg == LLDB_INVALID_REGNUM)
+        return false;
+
+    uint32_t ra_reg = reg_ctx->ConvertRegisterKindToRegisterNumber(eRegisterKindGeneric, LLDB_REGNUM_GENERIC_RA);
+    if (ra_reg == LLDB_INVALID_REGNUM)
+        return false;
+
+    uint32_t sp_reg = reg_ctx->ConvertRegisterKindToRegisterNumber(eRegisterKindGeneric, LLDB_REGNUM_GENERIC_SP);
+    if (sp_reg == LLDB_INVALID_REGNUM)
+        return false;
+
     // push host data onto target
     for ( size_t i = 0; i < args.size( ); i++ )
     {
@@ -276,11 +293,6 @@ ABISysV_hexagon::PrepareTrivialCall ( Thread &thread,
     // check if this is a variable argument function
     bool isVArg = prototype.isFunctionVarArg();
 
-    // get the register context for modifying all of the registers
-    RegisterContext *reg_ctx = thread.GetRegisterContext().get();
-    if (!reg_ctx)
-        return false;
-    
     // number of arguments passed by register
     int nRegArgs = nVArgRegParams;
     if (! isVArg )
@@ -323,10 +335,9 @@ ABISysV_hexagon::PrepareTrivialCall ( Thread &thread,
     }
 
     // update registers with current function call state
-    reg_ctx->WriteRegisterFromUnsigned ( 41, pc );
-    reg_ctx->WriteRegisterFromUnsigned ( 31, ra );
-    reg_ctx->WriteRegisterFromUnsigned ( 29, sp );
-//  reg_ctx->WriteRegisterFromUnsigned ( FP ??? );
+    reg_ctx->WriteRegisterFromUnsigned(pc_reg, pc);
+    reg_ctx->WriteRegisterFromUnsigned(ra_reg, ra);
+    reg_ctx->WriteRegisterFromUnsigned(sp_reg, sp);
 
 #if HEX_ABI_DEBUG
     // quick and dirty stack dumper for debugging