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Diffstat (limited to 'source/Plugins/ABI/SysV-s390x/ABISysV_s390x.cpp')
| -rw-r--r-- | source/Plugins/ABI/SysV-s390x/ABISysV_s390x.cpp | 807 |
1 files changed, 807 insertions, 0 deletions
diff --git a/source/Plugins/ABI/SysV-s390x/ABISysV_s390x.cpp b/source/Plugins/ABI/SysV-s390x/ABISysV_s390x.cpp new file mode 100644 index 0000000000000..055905523f812 --- /dev/null +++ b/source/Plugins/ABI/SysV-s390x/ABISysV_s390x.cpp @@ -0,0 +1,807 @@ +//===-- ABISysV_s390x.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_s390x.h" + +// C Includes +// C++ Includes +// Other libraries and framework includes +#include "llvm/ADT/STLExtras.h" +#include "llvm/ADT/Triple.h" + +// Project includes +#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/ValueObjectMemory.h" +#include "lldb/Core/ValueObjectRegister.h" +#include "lldb/Symbol/UnwindPlan.h" +#include "lldb/Target/Process.h" +#include "lldb/Target/RegisterContext.h" +#include "lldb/Target/StackFrame.h" +#include "lldb/Target/Target.h" +#include "lldb/Target/Thread.h" + +using namespace lldb; +using namespace lldb_private; + +enum dwarf_regnums +{ + // General Purpose Registers + dwarf_r0_s390x = 0, + dwarf_r1_s390x, + dwarf_r2_s390x, + dwarf_r3_s390x, + dwarf_r4_s390x, + dwarf_r5_s390x, + dwarf_r6_s390x, + dwarf_r7_s390x, + dwarf_r8_s390x, + dwarf_r9_s390x, + dwarf_r10_s390x, + dwarf_r11_s390x, + dwarf_r12_s390x, + dwarf_r13_s390x, + dwarf_r14_s390x, + dwarf_r15_s390x, + // Floating Point Registers / Vector Registers 0-15 + dwarf_f0_s390x = 16, + dwarf_f2_s390x, + dwarf_f4_s390x, + dwarf_f6_s390x, + dwarf_f1_s390x, + dwarf_f3_s390x, + dwarf_f5_s390x, + dwarf_f7_s390x, + dwarf_f8_s390x, + dwarf_f10_s390x, + dwarf_f12_s390x, + dwarf_f14_s390x, + dwarf_f9_s390x, + dwarf_f11_s390x, + dwarf_f13_s390x, + dwarf_f15_s390x, + // Access Registers + dwarf_acr0_s390x = 48, + dwarf_acr1_s390x, + dwarf_acr2_s390x, + dwarf_acr3_s390x, + dwarf_acr4_s390x, + dwarf_acr5_s390x, + dwarf_acr6_s390x, + dwarf_acr7_s390x, + dwarf_acr8_s390x, + dwarf_acr9_s390x, + dwarf_acr10_s390x, + dwarf_acr11_s390x, + dwarf_acr12_s390x, + dwarf_acr13_s390x, + dwarf_acr14_s390x, + dwarf_acr15_s390x, + // Program Status Word + dwarf_pswm_s390x = 64, + dwarf_pswa_s390x, + // Vector Registers 16-31 + dwarf_v16_s390x = 68, + dwarf_v18_s390x, + dwarf_v20_s390x, + dwarf_v22_s390x, + dwarf_v17_s390x, + dwarf_v19_s390x, + dwarf_v21_s390x, + dwarf_v23_s390x, + dwarf_v24_s390x, + dwarf_v26_s390x, + dwarf_v28_s390x, + dwarf_v30_s390x, + dwarf_v25_s390x, + dwarf_v27_s390x, + dwarf_v29_s390x, + dwarf_v31_s390x, +}; + +// RegisterKind: EHFrame, DWARF, Generic, Process Plugin, LLDB + +#define DEFINE_REG(name, size, alt, generic) \ + { \ + #name, alt, size, 0, eEncodingUint, eFormatHex, \ + { dwarf_##name##_s390x, dwarf_##name##_s390x, generic, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM }, \ + NULL, NULL, \ + } + +static RegisterInfo g_register_infos[] = +{ + DEFINE_REG(r0, 8, nullptr, LLDB_INVALID_REGNUM), + DEFINE_REG(r1, 8, nullptr, LLDB_INVALID_REGNUM), + DEFINE_REG(r2, 8, "arg1", LLDB_REGNUM_GENERIC_ARG1), + DEFINE_REG(r3, 8, "arg2", LLDB_REGNUM_GENERIC_ARG2), + DEFINE_REG(r4, 8, "arg3", LLDB_REGNUM_GENERIC_ARG3), + DEFINE_REG(r5, 8, "arg4", LLDB_REGNUM_GENERIC_ARG4), + DEFINE_REG(r6, 8, "arg5", LLDB_REGNUM_GENERIC_ARG5), + DEFINE_REG(r7, 8, nullptr, LLDB_INVALID_REGNUM), + DEFINE_REG(r8, 8, nullptr, LLDB_INVALID_REGNUM), + DEFINE_REG(r9, 8, nullptr, LLDB_INVALID_REGNUM), + DEFINE_REG(r10, 8, nullptr, LLDB_INVALID_REGNUM), + DEFINE_REG(r11, 8, "fp", LLDB_REGNUM_GENERIC_FP), + DEFINE_REG(r12, 8, nullptr, LLDB_INVALID_REGNUM), + DEFINE_REG(r13, 8, nullptr, LLDB_INVALID_REGNUM), + DEFINE_REG(r14, 8, nullptr, LLDB_INVALID_REGNUM), + DEFINE_REG(r15, 8, "sp", LLDB_REGNUM_GENERIC_SP), + DEFINE_REG(acr0, 4, nullptr, LLDB_INVALID_REGNUM), + DEFINE_REG(acr1, 4, nullptr, LLDB_INVALID_REGNUM), + DEFINE_REG(acr2, 4, nullptr, LLDB_INVALID_REGNUM), + DEFINE_REG(acr3, 4, nullptr, LLDB_INVALID_REGNUM), + DEFINE_REG(acr4, 4, nullptr, LLDB_INVALID_REGNUM), + DEFINE_REG(acr5, 4, nullptr, LLDB_INVALID_REGNUM), + DEFINE_REG(acr6, 4, nullptr, LLDB_INVALID_REGNUM), + DEFINE_REG(acr7, 4, nullptr, LLDB_INVALID_REGNUM), + DEFINE_REG(acr8, 4, nullptr, LLDB_INVALID_REGNUM), + DEFINE_REG(acr9, 4, nullptr, LLDB_INVALID_REGNUM), + DEFINE_REG(acr10, 4, nullptr, LLDB_INVALID_REGNUM), + DEFINE_REG(acr11, 4, nullptr, LLDB_INVALID_REGNUM), + DEFINE_REG(acr12, 4, nullptr, LLDB_INVALID_REGNUM), + DEFINE_REG(acr13, 4, nullptr, LLDB_INVALID_REGNUM), + DEFINE_REG(acr14, 4, nullptr, LLDB_INVALID_REGNUM), + DEFINE_REG(acr15, 4, nullptr, LLDB_INVALID_REGNUM), + DEFINE_REG(pswm, 8, "flags", LLDB_REGNUM_GENERIC_FLAGS), + DEFINE_REG(pswa, 8, "pc", LLDB_REGNUM_GENERIC_PC), + DEFINE_REG(f0, 8, nullptr, LLDB_INVALID_REGNUM), + DEFINE_REG(f1, 8, nullptr, LLDB_INVALID_REGNUM), + DEFINE_REG(f2, 8, nullptr, LLDB_INVALID_REGNUM), + DEFINE_REG(f3, 8, nullptr, LLDB_INVALID_REGNUM), + DEFINE_REG(f4, 8, nullptr, LLDB_INVALID_REGNUM), + DEFINE_REG(f5, 8, nullptr, LLDB_INVALID_REGNUM), + DEFINE_REG(f6, 8, nullptr, LLDB_INVALID_REGNUM), + DEFINE_REG(f7, 8, nullptr, LLDB_INVALID_REGNUM), + DEFINE_REG(f8, 8, nullptr, LLDB_INVALID_REGNUM), + DEFINE_REG(f9, 8, nullptr, LLDB_INVALID_REGNUM), + DEFINE_REG(f10, 8, nullptr, LLDB_INVALID_REGNUM), + DEFINE_REG(f11, 8, nullptr, LLDB_INVALID_REGNUM), + DEFINE_REG(f12, 8, nullptr, LLDB_INVALID_REGNUM), + DEFINE_REG(f13, 8, nullptr, LLDB_INVALID_REGNUM), + DEFINE_REG(f14, 8, nullptr, LLDB_INVALID_REGNUM), + DEFINE_REG(f15, 8, nullptr, LLDB_INVALID_REGNUM), +}; + +static const uint32_t k_num_register_infos = llvm::array_lengthof(g_register_infos); +static bool g_register_info_names_constified = false; + +const lldb_private::RegisterInfo * +ABISysV_s390x::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; +} + +size_t +ABISysV_s390x::GetRedZoneSize() const +{ + return 0; +} + +//------------------------------------------------------------------ +// Static Functions +//------------------------------------------------------------------ + +ABISP +ABISysV_s390x::CreateInstance(const ArchSpec &arch) +{ + static ABISP g_abi_sp; + if (arch.GetTriple().getArch() == llvm::Triple::systemz) + { + if (!g_abi_sp) + g_abi_sp.reset(new ABISysV_s390x); + return g_abi_sp; + } + return ABISP(); +} + +bool +ABISysV_s390x::PrepareTrivialCall(Thread &thread, addr_t sp, addr_t func_addr, addr_t return_addr, + llvm::ArrayRef<addr_t> args) const +{ + Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS)); + + if (log) + { + StreamString s; + s.Printf("ABISysV_s390x::PrepareTrivialCall (tid = 0x%" PRIx64 ", sp = 0x%" PRIx64 + ", func_addr = 0x%" PRIx64 ", return_addr = 0x%" PRIx64, + thread.GetID(), (uint64_t)sp, (uint64_t)func_addr, (uint64_t)return_addr); + + for (size_t i = 0; i < args.size(); ++i) + s.Printf(", arg%" PRIu64 " = 0x%" PRIx64, static_cast<uint64_t>(i + 1), args[i]); + s.PutCString(")"); + log->PutCString(s.GetString().c_str()); + } + + RegisterContext *reg_ctx = thread.GetRegisterContext().get(); + if (!reg_ctx) + return false; + + const RegisterInfo *pc_reg_info = reg_ctx->GetRegisterInfo(eRegisterKindGeneric, LLDB_REGNUM_GENERIC_PC); + const RegisterInfo *sp_reg_info = reg_ctx->GetRegisterInfo(eRegisterKindGeneric, LLDB_REGNUM_GENERIC_SP); + const RegisterInfo *ra_reg_info = reg_ctx->GetRegisterInfoByName("r14", 0); + ProcessSP process_sp(thread.GetProcess()); + + // Allocate a new stack frame and space for stack arguments if necessary + + addr_t arg_pos = 0; + if (args.size() > 5) + { + sp -= 8 * (args.size() - 5); + arg_pos = sp; + } + + sp -= 160; + + // Process arguments + + for (size_t i = 0; i < args.size(); ++i) + { + if (i < 5) + { + const RegisterInfo *reg_info = reg_ctx->GetRegisterInfo(eRegisterKindGeneric, LLDB_REGNUM_GENERIC_ARG1 + i); + if (log) + log->Printf("About to write arg%" PRIu64 " (0x%" PRIx64 ") into %s", static_cast<uint64_t>(i + 1), + args[i], reg_info->name); + if (!reg_ctx->WriteRegisterFromUnsigned(reg_info, args[i])) + return false; + } + else + { + Error error; + if (log) + log->Printf("About to write arg%" PRIu64 " (0x%" PRIx64 ") onto stack", static_cast<uint64_t>(i + 1), + args[i]); + if (!process_sp->WritePointerToMemory(arg_pos, args[i], error)) + return false; + arg_pos += 8; + } + } + + // %r14 is set to the return address + + if (log) + log->Printf("Writing RA: 0x%" PRIx64, (uint64_t)return_addr); + + if (!reg_ctx->WriteRegisterFromUnsigned(ra_reg_info, return_addr)) + return false; + + // %r15 is set to the actual stack value. + + if (log) + log->Printf("Writing SP: 0x%" PRIx64, (uint64_t)sp); + + if (!reg_ctx->WriteRegisterFromUnsigned(sp_reg_info, sp)) + return false; + + // %pc is set to the address of the called function. + + if (log) + log->Printf("Writing PC: 0x%" PRIx64, (uint64_t)func_addr); + + if (!reg_ctx->WriteRegisterFromUnsigned(pc_reg_info, func_addr)) + return false; + + return true; +} + +static bool +ReadIntegerArgument(Scalar &scalar, unsigned int bit_width, bool is_signed, Thread &thread, + uint32_t *argument_register_ids, unsigned int ¤t_argument_register, + addr_t ¤t_stack_argument) +{ + if (bit_width > 64) + return false; // Scalar can't hold large integer arguments + + if (current_argument_register < 5) + { + scalar = + thread.GetRegisterContext()->ReadRegisterAsUnsigned(argument_register_ids[current_argument_register], 0); + current_argument_register++; + if (is_signed) + scalar.SignExtend(bit_width); + } + else + { + uint32_t byte_size = (bit_width + (8 - 1)) / 8; + Error error; + if (thread.GetProcess()->ReadScalarIntegerFromMemory(current_stack_argument + 8 - byte_size, byte_size, + is_signed, scalar, error)) + { + current_stack_argument += 8; + return true; + } + return false; + } + return true; +} + +bool +ABISysV_s390x::GetArgumentValues(Thread &thread, ValueList &values) const +{ + unsigned int num_values = values.GetSize(); + unsigned int value_index; + + // Extract the register context so we can read arguments from registers + + RegisterContext *reg_ctx = thread.GetRegisterContext().get(); + + if (!reg_ctx) + return false; + + // Get the pointer to the first stack argument so we have a place to start + // when reading data + + addr_t sp = reg_ctx->GetSP(0); + + if (!sp) + return false; + + addr_t current_stack_argument = sp + 160; + + uint32_t argument_register_ids[5]; + + argument_register_ids[0] = + reg_ctx->GetRegisterInfo(eRegisterKindGeneric, LLDB_REGNUM_GENERIC_ARG1)->kinds[eRegisterKindLLDB]; + argument_register_ids[1] = + reg_ctx->GetRegisterInfo(eRegisterKindGeneric, LLDB_REGNUM_GENERIC_ARG2)->kinds[eRegisterKindLLDB]; + argument_register_ids[2] = + reg_ctx->GetRegisterInfo(eRegisterKindGeneric, LLDB_REGNUM_GENERIC_ARG3)->kinds[eRegisterKindLLDB]; + argument_register_ids[3] = + reg_ctx->GetRegisterInfo(eRegisterKindGeneric, LLDB_REGNUM_GENERIC_ARG4)->kinds[eRegisterKindLLDB]; + argument_register_ids[4] = + reg_ctx->GetRegisterInfo(eRegisterKindGeneric, LLDB_REGNUM_GENERIC_ARG5)->kinds[eRegisterKindLLDB]; + + unsigned int current_argument_register = 0; + + for (value_index = 0; value_index < num_values; ++value_index) + { + Value *value = values.GetValueAtIndex(value_index); + + if (!value) + return false; + + // We currently only support extracting values with Clang QualTypes. + // Do we care about others? + CompilerType compiler_type = value->GetCompilerType(); + if (!compiler_type) + return false; + bool is_signed; + + if (compiler_type.IsIntegerOrEnumerationType(is_signed)) + { + ReadIntegerArgument(value->GetScalar(), compiler_type.GetBitSize(&thread), is_signed, thread, + argument_register_ids, current_argument_register, current_stack_argument); + } + else if (compiler_type.IsPointerType()) + { + ReadIntegerArgument(value->GetScalar(), compiler_type.GetBitSize(&thread), false, thread, + argument_register_ids, current_argument_register, current_stack_argument); + } + } + + return true; +} + +Error +ABISysV_s390x::SetReturnValueObject(lldb::StackFrameSP &frame_sp, lldb::ValueObjectSP &new_value_sp) +{ + Error error; + if (!new_value_sp) + { + error.SetErrorString("Empty value object for return value."); + return error; + } + + CompilerType compiler_type = new_value_sp->GetCompilerType(); + if (!compiler_type) + { + error.SetErrorString("Null clang type for return value."); + return error; + } + + Thread *thread = frame_sp->GetThread().get(); + + bool is_signed; + uint32_t count; + bool is_complex; + + RegisterContext *reg_ctx = thread->GetRegisterContext().get(); + + bool set_it_simple = false; + if (compiler_type.IsIntegerOrEnumerationType(is_signed) || compiler_type.IsPointerType()) + { + const RegisterInfo *reg_info = reg_ctx->GetRegisterInfoByName("r2", 0); + + DataExtractor data; + Error data_error; + size_t num_bytes = new_value_sp->GetData(data, data_error); + if (data_error.Fail()) + { + error.SetErrorStringWithFormat("Couldn't convert return value to raw data: %s", data_error.AsCString()); + return error; + } + lldb::offset_t offset = 0; + if (num_bytes <= 8) + { + uint64_t raw_value = data.GetMaxU64(&offset, num_bytes); + + if (reg_ctx->WriteRegisterFromUnsigned(reg_info, raw_value)) + set_it_simple = true; + } + else + { + error.SetErrorString("We don't support returning longer than 64 bit integer values at present."); + } + } + else if (compiler_type.IsFloatingPointType(count, is_complex)) + { + if (is_complex) + error.SetErrorString("We don't support returning complex values at present"); + else + { + size_t bit_width = compiler_type.GetBitSize(frame_sp.get()); + if (bit_width <= 64) + { + const RegisterInfo *f0_info = reg_ctx->GetRegisterInfoByName("f0", 0); + RegisterValue f0_value; + DataExtractor data; + Error data_error; + size_t num_bytes = new_value_sp->GetData(data, data_error); + if (data_error.Fail()) + { + error.SetErrorStringWithFormat("Couldn't convert return value to raw data: %s", + data_error.AsCString()); + return error; + } + + unsigned char buffer[8]; + ByteOrder byte_order = data.GetByteOrder(); + + data.CopyByteOrderedData(0, num_bytes, buffer, 8, byte_order); + f0_value.SetBytes(buffer, 8, byte_order); + reg_ctx->WriteRegister(f0_info, f0_value); + set_it_simple = true; + } + else + { + // FIXME - don't know how to do long doubles yet. + error.SetErrorString("We don't support returning float values > 64 bits at present"); + } + } + } + + if (!set_it_simple) + { + // Okay we've got a structure or something that doesn't fit in a simple register. + // We should figure out where it really goes, but we don't support this yet. + error.SetErrorString("We only support setting simple integer and float return types at present."); + } + + return error; +} + +ValueObjectSP +ABISysV_s390x::GetReturnValueObjectSimple(Thread &thread, CompilerType &return_compiler_type) const +{ + ValueObjectSP return_valobj_sp; + Value value; + + if (!return_compiler_type) + return return_valobj_sp; + + // value.SetContext (Value::eContextTypeClangType, return_value_type); + value.SetCompilerType(return_compiler_type); + + RegisterContext *reg_ctx = thread.GetRegisterContext().get(); + if (!reg_ctx) + return return_valobj_sp; + + const uint32_t type_flags = return_compiler_type.GetTypeInfo(); + if (type_flags & eTypeIsScalar) + { + value.SetValueType(Value::eValueTypeScalar); + + bool success = false; + if (type_flags & eTypeIsInteger) + { + // Extract the register context so we can read arguments from registers + + const size_t byte_size = return_compiler_type.GetByteSize(nullptr); + uint64_t raw_value = + thread.GetRegisterContext()->ReadRegisterAsUnsigned(reg_ctx->GetRegisterInfoByName("r2", 0), 0); + const bool is_signed = (type_flags & eTypeIsSigned) != 0; + switch (byte_size) + { + default: + break; + + case sizeof(uint64_t): + if (is_signed) + value.GetScalar() = (int64_t)(raw_value); + else + value.GetScalar() = (uint64_t)(raw_value); + success = true; + break; + + case sizeof(uint32_t): + if (is_signed) + value.GetScalar() = (int32_t)(raw_value & UINT32_MAX); + else + value.GetScalar() = (uint32_t)(raw_value & UINT32_MAX); + success = true; + break; + + case sizeof(uint16_t): + if (is_signed) + value.GetScalar() = (int16_t)(raw_value & UINT16_MAX); + else + value.GetScalar() = (uint16_t)(raw_value & UINT16_MAX); + success = true; + break; + + case sizeof(uint8_t): + if (is_signed) + value.GetScalar() = (int8_t)(raw_value & UINT8_MAX); + else + value.GetScalar() = (uint8_t)(raw_value & UINT8_MAX); + success = true; + break; + } + } + else if (type_flags & eTypeIsFloat) + { + if (type_flags & eTypeIsComplex) + { + // Don't handle complex yet. + } + else + { + const size_t byte_size = return_compiler_type.GetByteSize(nullptr); + if (byte_size <= sizeof(long double)) + { + const RegisterInfo *f0_info = reg_ctx->GetRegisterInfoByName("f0", 0); + RegisterValue f0_value; + if (reg_ctx->ReadRegister(f0_info, f0_value)) + { + DataExtractor data; + if (f0_value.GetData(data)) + { + lldb::offset_t offset = 0; + if (byte_size == sizeof(float)) + { + value.GetScalar() = (float)data.GetFloat(&offset); + success = true; + } + else if (byte_size == sizeof(double)) + { + value.GetScalar() = (double)data.GetDouble(&offset); + success = true; + } + else if (byte_size == sizeof(long double)) + { + // Don't handle long double yet. + } + } + } + } + } + } + + if (success) + return_valobj_sp = + ValueObjectConstResult::Create(thread.GetStackFrameAtIndex(0).get(), value, ConstString("")); + } + else if (type_flags & eTypeIsPointer) + { + unsigned r2_id = reg_ctx->GetRegisterInfoByName("r2", 0)->kinds[eRegisterKindLLDB]; + value.GetScalar() = (uint64_t)thread.GetRegisterContext()->ReadRegisterAsUnsigned(r2_id, 0); + value.SetValueType(Value::eValueTypeScalar); + return_valobj_sp = ValueObjectConstResult::Create(thread.GetStackFrameAtIndex(0).get(), value, ConstString("")); + } + + return return_valobj_sp; +} + +ValueObjectSP +ABISysV_s390x::GetReturnValueObjectImpl(Thread &thread, CompilerType &return_compiler_type) const +{ + ValueObjectSP return_valobj_sp; + + if (!return_compiler_type) + return return_valobj_sp; + + ExecutionContext exe_ctx(thread.shared_from_this()); + return_valobj_sp = GetReturnValueObjectSimple(thread, return_compiler_type); + if (return_valobj_sp) + return return_valobj_sp; + + RegisterContextSP reg_ctx_sp = thread.GetRegisterContext(); + if (!reg_ctx_sp) + return return_valobj_sp; + + if (return_compiler_type.IsAggregateType()) + { + // FIXME: This is just taking a guess, r2 may very well no longer hold the return storage location. + // If we are going to do this right, when we make a new frame we should check to see if it uses a memory + // return, and if we are at the first instruction and if so stash away the return location. Then we would + // only return the memory return value if we know it is valid. + + unsigned r2_id = reg_ctx_sp->GetRegisterInfoByName("r2", 0)->kinds[eRegisterKindLLDB]; + lldb::addr_t storage_addr = (uint64_t)thread.GetRegisterContext()->ReadRegisterAsUnsigned(r2_id, 0); + return_valobj_sp = ValueObjectMemory::Create(&thread, "", Address(storage_addr, nullptr), return_compiler_type); + } + + return return_valobj_sp; +} + +bool +ABISysV_s390x::CreateFunctionEntryUnwindPlan(UnwindPlan &unwind_plan) +{ + unwind_plan.Clear(); + unwind_plan.SetRegisterKind(eRegisterKindDWARF); + + UnwindPlan::RowSP row(new UnwindPlan::Row); + + // Our Call Frame Address is the stack pointer value + 160 + row->GetCFAValue().SetIsRegisterPlusOffset(dwarf_r15_s390x, 160); + + // The previous PC is in r14 + row->SetRegisterLocationToRegister(dwarf_pswa_s390x, dwarf_r14_s390x, true); + + // All other registers are the same. + unwind_plan.AppendRow(row); + unwind_plan.SetSourceName("s390x at-func-entry default"); + unwind_plan.SetSourcedFromCompiler(eLazyBoolNo); + return true; +} + +bool +ABISysV_s390x::CreateDefaultUnwindPlan(UnwindPlan &unwind_plan) +{ + // There's really no default way to unwind on s390x. + // Trust the .eh_frame CFI, which should always be good. + return false; +} + +bool +ABISysV_s390x::GetFallbackRegisterLocation (const RegisterInfo *reg_info, + UnwindPlan::Row::RegisterLocation &unwind_regloc) +{ + // If a volatile register is being requested, we don't want to forward the next frame's register contents + // up the stack -- the register is not retrievable at this frame. + if (RegisterIsVolatile(reg_info)) + { + unwind_regloc.SetUndefined(); + return true; + } + + return false; +} + +bool +ABISysV_s390x::RegisterIsVolatile(const RegisterInfo *reg_info) +{ + return !RegisterIsCalleeSaved(reg_info); +} + +bool +ABISysV_s390x::RegisterIsCalleeSaved(const RegisterInfo *reg_info) +{ + if (reg_info) + { + // Preserved registers are : + // r6-r13, r15 + // f8-f15 + + const char *name = reg_info->name; + if (name[0] == 'r') + { + switch (name[1]) + { + case '6': // r6 + case '7': // r7 + case '8': // r8 + case '9': // r9 + return name[2] == '\0'; + + case '1': // r10, r11, r12, r13, r15 + if ((name[2] >= '0' && name[2] <= '3') || name[2] == '5') + return name[3] == '\0'; + break; + + default: + break; + } + } + if (name[0] == 'f') + { + switch (name[1]) + { + case '8': // r8 + case '9': // r9 + return name[2] == '\0'; + + case '1': // r10, r11, r12, r13, r14, r15 + if (name[2] >= '0' && name[2] <= '5') + return name[3] == '\0'; + break; + + default: + break; + } + } + + // Accept shorter-variant versions + if (name[0] == 's' && name[1] == 'p' && name[2] == '\0') // sp + return true; + if (name[0] == 'f' && name[1] == 'p' && name[2] == '\0') // fp + return true; + if (name[0] == 'p' && name[1] == 'c' && name[2] == '\0') // pc + return true; + } + return false; +} + +void +ABISysV_s390x::Initialize() +{ + PluginManager::RegisterPlugin(GetPluginNameStatic(), "System V ABI for s390x targets", CreateInstance); +} + +void +ABISysV_s390x::Terminate() +{ + PluginManager::UnregisterPlugin(CreateInstance); +} + +lldb_private::ConstString +ABISysV_s390x::GetPluginNameStatic() +{ + static ConstString g_name("sysv-s390x"); + return g_name; +} + +//------------------------------------------------------------------ +// PluginInterface protocol +//------------------------------------------------------------------ + +lldb_private::ConstString +ABISysV_s390x::GetPluginName() +{ + return GetPluginNameStatic(); +} + +uint32_t +ABISysV_s390x::GetPluginVersion() +{ + return 1; +} |