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llvm / lldb / release_35 / . / source / Plugins / ABI / SysV-hexagon / ABISysV_hexagon.cpp
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//===-- ABISysV_hexagon.cpp --------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "ABISysV_hexagon.h"
#include "lldb/Core/ConstString.h"
#include "lldb/Core/DataExtractor.h"
#include "lldb/Core/Error.h"
#include "lldb/Core/Log.h"
#include "lldb/Core/Module.h"
#include "lldb/Core/PluginManager.h"
#include "lldb/Core/RegisterValue.h"
#include "lldb/Core/Value.h"
#include "lldb/Core/ValueObjectConstResult.h"
#include "lldb/Core/ValueObjectRegister.h"
#include "lldb/Core/ValueObjectMemory.h"
#include "lldb/Symbol/ClangASTContext.h"
#include "lldb/Symbol/UnwindPlan.h"
#include "lldb/Target/Target.h"
#include "lldb/Target/Process.h"
#include "lldb/Target/RegisterContext.h"
#include "lldb/Target/StackFrame.h"
#include "lldb/Target/Thread.h"
#include "llvm/ADT/Triple.h"
#include "llvm/IR/Type.h"
using namespace lldb;
using namespace lldb_private;
static RegisterInfo g_register_infos[] =
{
// hexagon-core.xml
{ "r00" , "", 4, 0, eEncodingUint, eFormatAddressInfo, { 0, 0, LLDB_INVALID_REGNUM, 0, 0 }, NULL, NULL },
{ "r01" , "", 4, 0, eEncodingUint, eFormatAddressInfo, { 1, 1, LLDB_INVALID_REGNUM, 1, 1 }, NULL, NULL },
{ "r02" , "", 4, 0, eEncodingUint, eFormatAddressInfo, { 2, 2, LLDB_INVALID_REGNUM, 2, 2 }, NULL, NULL },
{ "r03" , "", 4, 0, eEncodingUint, eFormatAddressInfo, { 3, 3, LLDB_INVALID_REGNUM, 3, 3 }, NULL, NULL },
{ "r04" , "", 4, 0, eEncodingUint, eFormatAddressInfo, { 4, 4, LLDB_INVALID_REGNUM, 4, 4 }, NULL, NULL },
{ "r05" , "", 4, 0, eEncodingUint, eFormatAddressInfo, { 5, 5, LLDB_INVALID_REGNUM, 5, 5 }, NULL, NULL },
{ "r06" , "", 4, 0, eEncodingUint, eFormatAddressInfo, { 6, 6, LLDB_INVALID_REGNUM, 6, 6 }, NULL, NULL },
{ "r07" , "", 4, 0, eEncodingUint, eFormatAddressInfo, { 7, 7, LLDB_INVALID_REGNUM, 7, 7 }, NULL, NULL },
{ "r08" , "", 4, 0, eEncodingUint, eFormatAddressInfo, { 8, 8, LLDB_INVALID_REGNUM, 8, 8 }, NULL, NULL },
{ "r09" , "", 4, 0, eEncodingUint, eFormatAddressInfo, { 9, 9, LLDB_INVALID_REGNUM, 9, 9 }, NULL, NULL },
{ "r10" , "", 4, 0, eEncodingUint, eFormatAddressInfo, { 10, 10, LLDB_INVALID_REGNUM, 10, 10 }, NULL, NULL },
{ "r11" , "", 4, 0, eEncodingUint, eFormatAddressInfo, { 11, 11, LLDB_INVALID_REGNUM, 11, 11 }, NULL, NULL },
{ "r12" , "", 4, 0, eEncodingUint, eFormatAddressInfo, { 12, 12, LLDB_INVALID_REGNUM, 12, 12 }, NULL, NULL },
{ "r13" , "", 4, 0, eEncodingUint, eFormatAddressInfo, { 13, 13, LLDB_INVALID_REGNUM, 13, 13 }, NULL, NULL },
{ "r14" , "", 4, 0, eEncodingUint, eFormatAddressInfo, { 14, 14, LLDB_INVALID_REGNUM, 14, 14 }, NULL, NULL },
{ "r15" , "", 4, 0, eEncodingUint, eFormatAddressInfo, { 15, 15, LLDB_INVALID_REGNUM, 15, 15 }, NULL, NULL },
{ "r16" , "", 4, 0, eEncodingUint, eFormatAddressInfo, { 16, 16, LLDB_INVALID_REGNUM, 16, 16 }, NULL, NULL },
{ "r17" , "", 4, 0, eEncodingUint, eFormatAddressInfo, { 17, 17, LLDB_INVALID_REGNUM, 17, 17 }, NULL, NULL },
{ "r18" , "", 4, 0, eEncodingUint, eFormatAddressInfo, { 18, 18, LLDB_INVALID_REGNUM, 18, 18 }, NULL, NULL },
{ "r19" , "", 4, 0, eEncodingUint, eFormatAddressInfo, { 19, 19, LLDB_INVALID_REGNUM, 19, 19 }, NULL, NULL },
{ "r20" , "", 4, 0, eEncodingUint, eFormatAddressInfo, { 20, 20, LLDB_INVALID_REGNUM, 20, 20 }, NULL, NULL },
{ "r21" , "", 4, 0, eEncodingUint, eFormatAddressInfo, { 21, 21, LLDB_INVALID_REGNUM, 21, 21 }, NULL, NULL },
{ "r22" , "", 4, 0, eEncodingUint, eFormatAddressInfo, { 22, 22, LLDB_INVALID_REGNUM, 22, 22 }, NULL, NULL },
{ "r23" , "", 4, 0, eEncodingUint, eFormatAddressInfo, { 23, 23, LLDB_INVALID_REGNUM, 23, 23 }, NULL, NULL },
{ "r24" , "", 4, 0, eEncodingUint, eFormatAddressInfo, { 24, 24, LLDB_INVALID_REGNUM, 24, 24 }, NULL, NULL },
{ "r25" , "", 4, 0, eEncodingUint, eFormatAddressInfo, { 25, 25, LLDB_INVALID_REGNUM, 25, 25 }, NULL, NULL },
{ "r26" , "", 4, 0, eEncodingUint, eFormatAddressInfo, { 26, 26, LLDB_INVALID_REGNUM, 26, 26 }, NULL, NULL },
{ "r27" , "", 4, 0, eEncodingUint, eFormatAddressInfo, { 27, 27, LLDB_INVALID_REGNUM, 27, 27 }, NULL, NULL },
{ "r28" , "", 4, 0, eEncodingUint, eFormatAddressInfo, { 28, 28, LLDB_INVALID_REGNUM, 28, 28 }, NULL, NULL },
{ "sp" ,"r29", 4, 0, eEncodingUint, eFormatAddressInfo, { 29, 29, LLDB_REGNUM_GENERIC_SP, 29, 29 }, NULL, NULL },
{ "fp" ,"r30", 4, 0, eEncodingUint, eFormatAddressInfo, { 30, 30, LLDB_REGNUM_GENERIC_FP, 30, 30 }, NULL, NULL },
{ "lr" ,"r31", 4, 0, eEncodingUint, eFormatAddressInfo, { 31, 31, LLDB_REGNUM_GENERIC_RA, 31, 31 }, NULL, NULL },
{ "sa0" , "", 4, 0, eEncodingUint, eFormatAddressInfo, { 32, 32, LLDB_INVALID_REGNUM, 32, 32 }, NULL, NULL },
{ "lc0" , "", 4, 0, eEncodingUint, eFormatAddressInfo, { 33, 33, LLDB_INVALID_REGNUM, 33, 33 }, NULL, NULL },
{ "sa1" , "", 4, 0, eEncodingUint, eFormatAddressInfo, { 34, 34, LLDB_INVALID_REGNUM, 34, 34 }, NULL, NULL },
{ "lc1" , "", 4, 0, eEncodingUint, eFormatAddressInfo, { 35, 35, LLDB_INVALID_REGNUM, 35, 35 }, NULL, NULL },
// --> hexagon-v4/5/55/56-sim.xml
{ "p3_0" , "", 4, 0, eEncodingUint, eFormatAddressInfo, { 36, 36, LLDB_INVALID_REGNUM, 36, 36 }, NULL, NULL },
// PADDING {
{ "p00" , "", 4, 0, eEncodingInvalid, eFormatInvalid, { 37, 37, LLDB_INVALID_REGNUM, 37, 37 }, NULL, NULL },
// }
{ "m0" , "", 4, 0, eEncodingUint, eFormatAddressInfo, { 38, 38, LLDB_INVALID_REGNUM, 38, 38 }, NULL, NULL },
{ "m1" , "", 4, 0, eEncodingUint, eFormatAddressInfo, { 39, 39, LLDB_INVALID_REGNUM, 39, 39 }, NULL, NULL },
{ "usr" , "", 4, 0, eEncodingUint, eFormatAddressInfo, { 40, 40, LLDB_INVALID_REGNUM, 40, 40 }, NULL, NULL },
{ "pc" , "", 4, 0, eEncodingUint, eFormatAddressInfo, { 41, 41, LLDB_REGNUM_GENERIC_PC, 41, 41 }, NULL, NULL },
{ "ugp" , "", 4, 0, eEncodingUint, eFormatAddressInfo, { 42, 42, LLDB_INVALID_REGNUM, 42, 42 }, NULL, NULL },
{ "gp" , "", 4, 0, eEncodingUint, eFormatAddressInfo, { 43, 43, LLDB_INVALID_REGNUM, 43, 43 }, NULL, NULL },
{ "cs0" , "", 4, 0, eEncodingUint, eFormatAddressInfo, { 44, 44, LLDB_INVALID_REGNUM, 44, 44 }, NULL, NULL },
{ "cs1" , "", 4, 0, eEncodingUint, eFormatAddressInfo, { 45, 45, LLDB_INVALID_REGNUM, 45, 45 }, NULL, NULL },
// PADDING {
{ "p01" , "", 4, 0, eEncodingInvalid, eFormatInvalid, { 46, 46, LLDB_INVALID_REGNUM, 46, 46 }, NULL, NULL },
{ "p02" , "", 4, 0, eEncodingInvalid, eFormatInvalid, { 47, 47, LLDB_INVALID_REGNUM, 47, 47 }, NULL, NULL },
{ "p03" , "", 4, 0, eEncodingInvalid, eFormatInvalid, { 48, 48, LLDB_INVALID_REGNUM, 48, 48 }, NULL, NULL },
{ "p04" , "", 4, 0, eEncodingInvalid, eFormatInvalid, { 49, 49, LLDB_INVALID_REGNUM, 49, 49 }, NULL, NULL },
{ "p05" , "", 4, 0, eEncodingInvalid, eFormatInvalid, { 50, 50, LLDB_INVALID_REGNUM, 50, 50 }, NULL, NULL },
{ "p06" , "", 4, 0, eEncodingInvalid, eFormatInvalid, { 51, 51, LLDB_INVALID_REGNUM, 51, 51 }, NULL, NULL },
{ "p07" , "", 4, 0, eEncodingInvalid, eFormatInvalid, { 52, 52, LLDB_INVALID_REGNUM, 52, 52 }, NULL, NULL },
{ "p08" , "", 4, 0, eEncodingInvalid, eFormatInvalid, { 53, 53, LLDB_INVALID_REGNUM, 53, 53 }, NULL, NULL },
{ "p09" , "", 4, 0, eEncodingInvalid, eFormatInvalid, { 54, 54, LLDB_INVALID_REGNUM, 54, 54 }, NULL, NULL },
{ "p10" , "", 4, 0, eEncodingInvalid, eFormatInvalid, { 55, 55, LLDB_INVALID_REGNUM, 55, 55 }, NULL, NULL },
{ "p11" , "", 4, 0, eEncodingInvalid, eFormatInvalid, { 56, 56, LLDB_INVALID_REGNUM, 56, 56 }, NULL, NULL },
{ "p12" , "", 4, 0, eEncodingInvalid, eFormatInvalid, { 57, 57, LLDB_INVALID_REGNUM, 57, 57 }, NULL, NULL },
{ "p13" , "", 4, 0, eEncodingInvalid, eFormatInvalid, { 58, 58, LLDB_INVALID_REGNUM, 58, 58 }, NULL, NULL },
{ "p14" , "", 4, 0, eEncodingInvalid, eFormatInvalid, { 59, 59, LLDB_INVALID_REGNUM, 59, 59 }, NULL, NULL },
{ "p15" , "", 4, 0, eEncodingInvalid, eFormatInvalid, { 60, 60, LLDB_INVALID_REGNUM, 60, 60 }, NULL, NULL },
{ "p16" , "", 4, 0, eEncodingInvalid, eFormatInvalid, { 61, 61, LLDB_INVALID_REGNUM, 61, 61 }, NULL, NULL },
{ "p17" , "", 4, 0, eEncodingInvalid, eFormatInvalid, { 62, 62, LLDB_INVALID_REGNUM, 62, 62 }, NULL, NULL },
{ "p18" , "", 4, 0, eEncodingInvalid, eFormatInvalid, { 63, 63, LLDB_INVALID_REGNUM, 63, 63 }, NULL, NULL },
// }
{ "sgp0" , "", 4, 0, eEncodingUint, eFormatAddressInfo, { 64, 64, LLDB_INVALID_REGNUM, 64, 64 }, NULL, NULL },
// PADDING {
{ "p19" , "", 4, 0, eEncodingInvalid, eFormatInvalid, { 65, 65, LLDB_INVALID_REGNUM, 65, 65 }, NULL, NULL },
// }
{ "stid" , "", 4, 0, eEncodingUint, eFormatAddressInfo, { 66, 66, LLDB_INVALID_REGNUM, 66, 66 }, NULL, NULL },
{ "elr" , "", 4, 0, eEncodingUint, eFormatAddressInfo, { 67, 67, LLDB_INVALID_REGNUM, 67, 67 }, NULL, NULL },
{ "badva0", "", 4, 0, eEncodingUint, eFormatAddressInfo, { 68, 68, LLDB_INVALID_REGNUM, 68, 68 }, NULL, NULL },
{ "badva1", "", 4, 0, eEncodingUint, eFormatAddressInfo, { 69, 69, LLDB_INVALID_REGNUM, 69, 69 }, NULL, NULL },
{ "ssr" , "", 4, 0, eEncodingUint, eFormatAddressInfo, { 70, 70, LLDB_INVALID_REGNUM, 70, 70 }, NULL, NULL },
{ "ccr" , "", 4, 0, eEncodingUint, eFormatAddressInfo, { 71, 71, LLDB_INVALID_REGNUM, 71, 71 }, NULL, NULL },
{ "htid" , "", 4, 0, eEncodingUint, eFormatAddressInfo, { 72, 72, LLDB_INVALID_REGNUM, 72, 72 }, NULL, NULL },
// PADDING {
{ "p20" , "", 4, 0, eEncodingInvalid, eFormatInvalid, { 73, 73, LLDB_INVALID_REGNUM, 73, 73 }, NULL, NULL },
// }
{ "imask" , "", 4, 0, eEncodingUint, eFormatAddressInfo, { 74, 74, LLDB_INVALID_REGNUM, 74, 74 }, NULL, NULL },
// PADDING {
{ "p21" , "", 4, 0, eEncodingInvalid, eFormatInvalid, { 75, 75, LLDB_INVALID_REGNUM, 75, 75 }, NULL, NULL },
{ "p22" , "", 4, 0, eEncodingInvalid, eFormatInvalid, { 76, 76, LLDB_INVALID_REGNUM, 76, 76 }, NULL, NULL },
{ "p23" , "", 4, 0, eEncodingInvalid, eFormatInvalid, { 77, 77, LLDB_INVALID_REGNUM, 77, 77 }, NULL, NULL },
{ "p24" , "", 4, 0, eEncodingInvalid, eFormatInvalid, { 78, 78, LLDB_INVALID_REGNUM, 78, 78 }, NULL, NULL },
{ "p25" , "", 4, 0, eEncodingInvalid, eFormatInvalid, { 79, 79, LLDB_INVALID_REGNUM, 79, 79 }, NULL, NULL },
// }
{ "g0" , "", 4, 0, eEncodingUint, eFormatAddressInfo, { 80, 80, LLDB_INVALID_REGNUM, 80, 80 }, NULL, NULL },
{ "g1" , "", 4, 0, eEncodingUint, eFormatAddressInfo, { 81, 81, LLDB_INVALID_REGNUM, 81, 81 }, NULL, NULL },
{ "g2" , "", 4, 0, eEncodingUint, eFormatAddressInfo, { 82, 82, LLDB_INVALID_REGNUM, 82, 82 }, NULL, NULL },
{ "g3" , "", 4, 0, eEncodingUint, eFormatAddressInfo, { 83, 83, LLDB_INVALID_REGNUM, 83, 83 }, NULL, NULL }
};
static const uint32_t k_num_register_infos = sizeof(g_register_infos)/sizeof(RegisterInfo);
static bool g_register_info_names_constified = false;
const lldb_private::RegisterInfo *
ABISysV_hexagon::GetRegisterInfoArray ( uint32_t &count )
{
// Make the C-string names and alt_names for the register infos into const
// C-string values by having the ConstString unique the names in the global
// constant C-string pool.
if (!g_register_info_names_constified)
{
g_register_info_names_constified = true;
for (uint32_t i=0; i<k_num_register_infos; ++i)
{
if (g_register_infos[i].name)
g_register_infos[i].name = ConstString(g_register_infos[i].name).GetCString();
if (g_register_infos[i].alt_name)
g_register_infos[i].alt_name = ConstString(g_register_infos[i].alt_name).GetCString();
}
}
count = k_num_register_infos;
return g_register_infos;
}
/*
http://en.wikipedia.org/wiki/Red_zone_%28computing%29
In computing, a red zone is a fixed size area in memory beyond the stack pointer that has not been
"allocated". This region of memory is not to be modified by interrupt/exception/signal handlers.
This allows the space to be used for temporary data without the extra overhead of modifying the
stack pointer. The x86-64 ABI mandates a 128 byte red zone.[1] The OpenRISC toolchain assumes a
128 byte red zone though it is not documented.
*/
size_t
ABISysV_hexagon::GetRedZoneSize () const
{
return 0;
}
//------------------------------------------------------------------
// Static Functions
//------------------------------------------------------------------
ABISP
ABISysV_hexagon::CreateInstance ( const ArchSpec &arch )
{
static ABISP g_abi_sp;
if (arch.GetTriple().getArch() == llvm::Triple::hexagon)
{
if (!g_abi_sp)
g_abi_sp.reset (new ABISysV_hexagon);
return g_abi_sp;
}
return ABISP();
}
bool
ABISysV_hexagon::PrepareTrivialCall ( Thread &thread,
lldb::addr_t sp ,
lldb::addr_t pc ,
lldb::addr_t ra ,
llvm::ArrayRef<addr_t> args ) const
{
// we don't use the traditional trivial call specialized for jit
return false;
}
/*
// AD:
// . safeguard the current stack
// . how can we know that the called function will create its own frame properly?
// . we could manually make a new stack first:
// 2. push RA
// 3. push FP
// 4. FP = SP
// 5. SP = SP ( since no locals in our temp frame )
// AD 6/05/2014
// . variable argument list parameters are not passed via registers, they are passed on
// the stack. This presents us with a problem, since we need to know when the valist
// starts. Currently I can find out if a function is varg, but not how many
// real parameters it takes. Thus I don't know when to start spilling the vargs. For
// the time being, to progress, I will assume that it takes on real parameter before
// the vargs list starts.
// AD 06/05/2014
// . how do we adhere to the stack alignment requirements
// AD 06/05/2014
// . handle 64bit values and their register / stack requirements
*/
#define HEX_ABI_DEBUG 1
bool
ABISysV_hexagon::PrepareTrivialCall ( Thread &thread,
lldb::addr_t sp ,
lldb::addr_t pc ,
lldb::addr_t ra ,
llvm::Type &prototype,
llvm::ArrayRef<ABI::CallArgument> args) const
{
// default number of register passed arguments for varg functions
const int nVArgRegParams = 1;
Error error;
// grab the process so we have access to the memory for spilling
lldb::ProcessSP proc = thread.GetProcess( );
// push host data onto target
for ( int i = 0; i < args.size( ); i++ )
{
const ABI::CallArgument &arg = args[i];
// skip over target values
if ( arg.type == ABI::CallArgument::TargetValue )
continue;
// round up to 8 byte multiple
size_t argSize = ( arg.size | 0x7 ) + 1;
// create space on the stack for this data
sp -= argSize;
// write this argument onto the stack of the host process
proc.get( )->WriteMemory( sp, arg.data, arg.size, error );
if ( error.Fail( ) )
return false;
// update the argument with the target pointer
//XXX: This is a gross hack for getting around the const
*((size_t*)(&arg.value)) = sp;
}
#if HEX_ABI_DEBUG
// print the original stack pointer
printf( "sp : %04x \n", sp );
#endif
// make sure number of parameters matches prototype
assert( prototype.getFunctionNumParams( ) == args.size( ) );
// 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 )
{
// number of arguments is limited by [R0 : R5] space
nRegArgs = args.size( );
if ( nRegArgs > 6 )
nRegArgs = 6;
}
// pass arguments that are passed via registers
for ( int i = 0; i < nRegArgs; i++ )
{
// get this parameter type
llvm::Type *argType = prototype.getFunctionParamType( i );
// get the parameter as a u32
uint32_t param = (uint32_t)args[i].value;
// write argument into register
if (!reg_ctx->WriteRegisterFromUnsigned( i, param ))
return false;
}
// number of arguments to spill onto stack
int nSpillArgs = args.size( ) - nRegArgs;
// make space on the stack for arguments
sp -= 4 * nSpillArgs;
// align stack on an 8 byte boundary
if ( sp & 7 )
sp -= 4;
// arguments that are passed on the stack
for ( int i = nRegArgs, offs=0; i < args.size( ); i++ )
{
// get the parameter as a u32
uint32_t param = (uint32_t)args[i].value;
// write argument to stack
proc->WriteMemory( sp + offs, (void*)&param, sizeof( param ), error );
if ( !error.Success( ) )
return false;
//
offs += 4;
}
// 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 ??? );
#if HEX_ABI_DEBUG
// quick and dirty stack dumper for debugging
for ( int i = -8; i < 8; i++ )
{
uint32_t data = 0;
lldb::addr_t addr = sp + i * 4;
proc->ReadMemory( addr, (void*)&data, sizeof( data ), error );
printf( "\n0x%04x 0x%08x ", addr, data );
if ( i == 0 ) printf( "<<-- sp" );
}
printf( "\n" );
#endif
return true;
}
static bool
ReadIntegerArgument ( Scalar &scalar,
unsigned int bit_width,
bool is_signed,
Thread &thread,
uint32_t *argument_register_ids,
unsigned int &current_argument_register,
addr_t &current_stack_argument)
{
return false;
}
bool
ABISysV_hexagon::GetArgumentValues ( Thread &thread, ValueList &values ) const
{
return false;
}
Error
ABISysV_hexagon::SetReturnValueObject ( lldb::StackFrameSP &frame_sp, lldb::ValueObjectSP &new_value_sp )
{
Error error;
return error;
}
ValueObjectSP
ABISysV_hexagon::GetReturnValueObjectSimple ( Thread &thread, ClangASTType &return_clang_type ) const
{
ValueObjectSP return_valobj_sp;
return return_valobj_sp;
}
ValueObjectSP
ABISysV_hexagon::GetReturnValueObjectImpl ( Thread &thread, ClangASTType &return_clang_type ) const
{
ValueObjectSP return_valobj_sp;
return return_valobj_sp;
}
// called when we are on the first instruction of a new function
// for hexagon the return address is in RA (R31)
bool
ABISysV_hexagon::CreateFunctionEntryUnwindPlan ( UnwindPlan &unwind_plan )
{
unwind_plan.Clear();
unwind_plan.SetRegisterKind(eRegisterKindGeneric);
unwind_plan.SetReturnAddressRegister(LLDB_REGNUM_GENERIC_RA);
UnwindPlan::RowSP row(new UnwindPlan::Row);
// Our Call Frame Address is the stack pointer value
row->SetCFARegister(LLDB_REGNUM_GENERIC_SP);
row->SetCFAOffset(4);
row->SetOffset(0);
// The previous PC is in the LR
row->SetRegisterLocationToRegister(LLDB_REGNUM_GENERIC_PC, LLDB_REGNUM_GENERIC_RA, true);
unwind_plan.AppendRow(row);
unwind_plan.SetSourceName("hexagon at-func-entry default");
unwind_plan.SetSourcedFromCompiler(eLazyBoolNo);
return true;
}
bool
ABISysV_hexagon::CreateDefaultUnwindPlan ( UnwindPlan &unwind_plan )
{
unwind_plan.Clear();
unwind_plan.SetRegisterKind(eRegisterKindGeneric);
uint32_t fp_reg_num = LLDB_REGNUM_GENERIC_FP;
uint32_t sp_reg_num = LLDB_REGNUM_GENERIC_SP;
uint32_t pc_reg_num = LLDB_REGNUM_GENERIC_PC;
UnwindPlan::RowSP row(new UnwindPlan::Row);
row->SetCFARegister(LLDB_REGNUM_GENERIC_FP);
row->SetCFAOffset(8);
row->SetRegisterLocationToAtCFAPlusOffset(fp_reg_num,-8, true);
row->SetRegisterLocationToAtCFAPlusOffset(pc_reg_num,-4, true);
row->SetRegisterLocationToIsCFAPlusOffset(sp_reg_num, 0, true);
unwind_plan.AppendRow(row);
unwind_plan.SetSourceName("hexagon default unwind plan");
unwind_plan.SetSourcedFromCompiler(eLazyBoolNo);
unwind_plan.SetUnwindPlanValidAtAllInstructions(eLazyBoolNo);
return true;
}
/*
Register Usage Saved By
R0 - R5 parameters(a) -
R6 - R15 Scratch(b) Caller
R16 - R27 Scratch Callee
R28 Scratch(b) Caller
R29 - R31 Stack Frames Callee(c)
P3:0 Processor State Caller
a = the caller can change parameter values
b = R14 - R15 and R28 are used by the procedure linkage table
c = R29 - R31 are saved and restored by allocframe() and deallocframe()
*/
bool
ABISysV_hexagon::RegisterIsVolatile ( const RegisterInfo *reg_info )
{
return !RegisterIsCalleeSaved( reg_info );
}
bool
ABISysV_hexagon::RegisterIsCalleeSaved ( const RegisterInfo *reg_info )
{
int reg = ((reg_info->byte_offset) / 4);
bool save = (reg >= 16) && (reg <= 27);
save |= (reg >= 29) && (reg <= 32);
return save;
}
void
ABISysV_hexagon::Initialize( void )
{
PluginManager::RegisterPlugin
(
GetPluginNameStatic(),
"System V ABI for hexagon targets",
CreateInstance
);
}
void
ABISysV_hexagon::Terminate( void )
{
PluginManager::UnregisterPlugin( CreateInstance );
}
lldb_private::ConstString
ABISysV_hexagon::GetPluginNameStatic()
{
static ConstString g_name( "sysv-hexagon" );
return g_name;
}
//------------------------------------------------------------------
// PluginInterface protocol
//------------------------------------------------------------------
lldb_private::ConstString
ABISysV_hexagon::GetPluginName( void )
{
return GetPluginNameStatic();
}
uint32_t
ABISysV_hexagon::GetPluginVersion( void )
{
return 1;
}
// get value object specialized to work with llvm IR types
lldb::ValueObjectSP
ABISysV_hexagon::GetReturnValueObjectImpl( lldb_private::Thread &thread, llvm::Type &retType ) const
{
Value value;
ValueObjectSP vObjSP;
// get the current register context
RegisterContext *reg_ctx = thread.GetRegisterContext().get();
if (!reg_ctx)
return vObjSP;
// for now just pop R0 to find the return value
const lldb_private::RegisterInfo *r0_info = reg_ctx->GetRegisterInfoAtIndex( 0 );
if ( r0_info == nullptr )
return vObjSP;
// void return type
if ( retType.isVoidTy( ) )
{
value.GetScalar( ) = 0;
}
// integer / pointer return type
else
if ( retType.isIntegerTy( ) || retType.isPointerTy( ) )
{
// read r0 register value
lldb_private::RegisterValue r0_value;
if ( !reg_ctx->ReadRegister( r0_info, r0_value ) )
return vObjSP;
// push r0 into value
uint32_t r0_u32 = r0_value.GetAsUInt32( );
// account for integer size
if ( retType.isIntegerTy() && retType.isSized() )
{
uint64_t size = retType.getScalarSizeInBits( );
uint64_t mask = ( 1ull << size ) - 1;
// mask out higher order bits then the type we expect
r0_u32 &= mask;
}
value.GetScalar( ) = r0_u32;
}
// unsupported return type
else
return vObjSP;
// pack the value into a ValueObjectSP
vObjSP = ValueObjectConstResult::Create
(
thread.GetStackFrameAtIndex(0).get(),
value,
ConstString("")
);
return vObjSP;
}