| //===-- ABISysV_mips64.cpp ------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "ABISysV_mips64.h" |
| |
| #include "llvm/ADT/STLExtras.h" |
| #include "llvm/ADT/Triple.h" |
| |
| #include "lldb/Core/Module.h" |
| #include "lldb/Core/PluginManager.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" |
| #include "lldb/Utility/ConstString.h" |
| #include "lldb/Utility/DataExtractor.h" |
| #include "lldb/Utility/Log.h" |
| #include "lldb/Utility/RegisterValue.h" |
| #include "lldb/Utility/Status.h" |
| |
| using namespace lldb; |
| using namespace lldb_private; |
| |
| LLDB_PLUGIN_DEFINE(ABISysV_mips64) |
| |
| enum dwarf_regnums { |
| dwarf_r0 = 0, |
| dwarf_r1, |
| dwarf_r2, |
| dwarf_r3, |
| dwarf_r4, |
| dwarf_r5, |
| dwarf_r6, |
| dwarf_r7, |
| dwarf_r8, |
| dwarf_r9, |
| dwarf_r10, |
| dwarf_r11, |
| dwarf_r12, |
| dwarf_r13, |
| dwarf_r14, |
| dwarf_r15, |
| dwarf_r16, |
| dwarf_r17, |
| dwarf_r18, |
| dwarf_r19, |
| dwarf_r20, |
| dwarf_r21, |
| dwarf_r22, |
| dwarf_r23, |
| dwarf_r24, |
| dwarf_r25, |
| dwarf_r26, |
| dwarf_r27, |
| dwarf_r28, |
| dwarf_r29, |
| dwarf_r30, |
| dwarf_r31, |
| dwarf_sr, |
| dwarf_lo, |
| dwarf_hi, |
| dwarf_bad, |
| dwarf_cause, |
| dwarf_pc |
| }; |
| |
| static const RegisterInfo g_register_infos_mips64[] = { |
| // NAME ALT SZ OFF ENCODING FORMAT EH_FRAME |
| // DWARF GENERIC PROCESS PLUGIN |
| // LLDB NATIVE |
| // ======== ====== == === ============= ========== ============= |
| // ================= ==================== ================= |
| // ==================== |
| {"r0", |
| "zero", |
| 8, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_r0, dwarf_r0, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| 0}, |
| {"r1", |
| "AT", |
| 8, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_r1, dwarf_r1, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| 0}, |
| {"r2", |
| "v0", |
| 8, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_r2, dwarf_r2, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| 0}, |
| {"r3", |
| "v1", |
| 8, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_r3, dwarf_r3, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| 0}, |
| {"r4", |
| "arg1", |
| 8, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_r4, dwarf_r4, LLDB_REGNUM_GENERIC_ARG1, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| 0}, |
| {"r5", |
| "arg2", |
| 8, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_r5, dwarf_r5, LLDB_REGNUM_GENERIC_ARG2, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| 0}, |
| {"r6", |
| "arg3", |
| 8, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_r6, dwarf_r6, LLDB_REGNUM_GENERIC_ARG3, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| 0}, |
| {"r7", |
| "arg4", |
| 8, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_r7, dwarf_r7, LLDB_REGNUM_GENERIC_ARG4, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| 0}, |
| {"r8", |
| "arg5", |
| 8, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_r8, dwarf_r8, LLDB_REGNUM_GENERIC_ARG5, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| 0}, |
| {"r9", |
| "arg6", |
| 8, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_r9, dwarf_r9, LLDB_REGNUM_GENERIC_ARG6, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| 0}, |
| {"r10", |
| "arg7", |
| 8, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_r10, dwarf_r10, LLDB_REGNUM_GENERIC_ARG7, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| 0}, |
| {"r11", |
| "arg8", |
| 8, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_r11, dwarf_r11, LLDB_REGNUM_GENERIC_ARG8, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| 0}, |
| {"r12", |
| nullptr, |
| 8, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_r12, dwarf_r12, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| 0}, |
| {"r13", |
| nullptr, |
| 8, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_r13, dwarf_r13, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| 0}, |
| {"r14", |
| nullptr, |
| 8, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_r14, dwarf_r14, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| 0}, |
| {"r15", |
| nullptr, |
| 8, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_r15, dwarf_r15, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| 0}, |
| {"r16", |
| nullptr, |
| 8, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_r16, dwarf_r16, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| 0}, |
| {"r17", |
| nullptr, |
| 8, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_r17, dwarf_r17, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| 0}, |
| {"r18", |
| nullptr, |
| 8, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_r18, dwarf_r18, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| 0}, |
| {"r19", |
| nullptr, |
| 8, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_r19, dwarf_r19, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| 0}, |
| {"r20", |
| nullptr, |
| 8, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_r20, dwarf_r20, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| 0}, |
| {"r21", |
| nullptr, |
| 8, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_r21, dwarf_r21, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| 0}, |
| {"r22", |
| nullptr, |
| 8, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_r22, dwarf_r22, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| 0}, |
| {"r23", |
| nullptr, |
| 8, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_r23, dwarf_r23, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| 0}, |
| {"r24", |
| nullptr, |
| 8, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_r24, dwarf_r24, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| 0}, |
| {"r25", |
| nullptr, |
| 8, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_r25, dwarf_r25, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| 0}, |
| {"r26", |
| nullptr, |
| 8, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_r26, dwarf_r26, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| 0}, |
| {"r27", |
| nullptr, |
| 8, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_r27, dwarf_r27, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| 0}, |
| {"r28", |
| "gp", |
| 8, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_r28, dwarf_r28, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| 0}, |
| {"r29", |
| "sp", |
| 8, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_r29, dwarf_r29, LLDB_REGNUM_GENERIC_SP, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| 0}, |
| {"r30", |
| "fp", |
| 8, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_r30, dwarf_r30, LLDB_REGNUM_GENERIC_FP, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| 0}, |
| {"r31", |
| "ra", |
| 8, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_r31, dwarf_r31, LLDB_REGNUM_GENERIC_RA, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| 0}, |
| {"sr", |
| nullptr, |
| 4, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_sr, dwarf_sr, LLDB_REGNUM_GENERIC_FLAGS, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| 0}, |
| {"lo", |
| nullptr, |
| 8, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_lo, dwarf_lo, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| 0}, |
| {"hi", |
| nullptr, |
| 8, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_hi, dwarf_hi, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| 0}, |
| {"bad", |
| nullptr, |
| 8, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_bad, dwarf_bad, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| 0}, |
| {"cause", |
| nullptr, |
| 8, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_cause, dwarf_cause, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| 0}, |
| {"pc", |
| nullptr, |
| 8, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_pc, dwarf_pc, LLDB_REGNUM_GENERIC_PC, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| 0}, |
| }; |
| |
| static const uint32_t k_num_register_infos = |
| llvm::array_lengthof(g_register_infos_mips64); |
| |
| const lldb_private::RegisterInfo * |
| ABISysV_mips64::GetRegisterInfoArray(uint32_t &count) { |
| count = k_num_register_infos; |
| return g_register_infos_mips64; |
| } |
| |
| size_t ABISysV_mips64::GetRedZoneSize() const { return 0; } |
| |
| // Static Functions |
| |
| ABISP |
| ABISysV_mips64::CreateInstance(lldb::ProcessSP process_sp, const ArchSpec &arch) { |
| if (arch.GetTriple().isMIPS64()) |
| return ABISP( |
| new ABISysV_mips64(std::move(process_sp), MakeMCRegisterInfo(arch))); |
| return ABISP(); |
| } |
| |
| bool ABISysV_mips64::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_mips64::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%zd = 0x%" PRIx64, i + 1, args[i]); |
| s.PutCString(")"); |
| log->PutString(s.GetString()); |
| } |
| |
| RegisterContext *reg_ctx = thread.GetRegisterContext().get(); |
| if (!reg_ctx) |
| return false; |
| |
| const RegisterInfo *reg_info = nullptr; |
| |
| if (args.size() > 8) // TODO handle more than 8 arguments |
| return false; |
| |
| for (size_t i = 0; i < args.size(); ++i) { |
| reg_info = reg_ctx->GetRegisterInfo(eRegisterKindGeneric, |
| LLDB_REGNUM_GENERIC_ARG1 + i); |
| LLDB_LOGF(log, "About to write arg%zd (0x%" PRIx64 ") into %s", i + 1, |
| args[i], reg_info->name); |
| if (!reg_ctx->WriteRegisterFromUnsigned(reg_info, args[i])) |
| return false; |
| } |
| |
| // First, align the SP |
| |
| LLDB_LOGF(log, "16-byte aligning SP: 0x%" PRIx64 " to 0x%" PRIx64, |
| (uint64_t)sp, (uint64_t)(sp & ~0xfull)); |
| |
| sp &= ~(0xfull); // 16-byte alignment |
| |
| Status error; |
| 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->GetRegisterInfo(eRegisterKindGeneric, LLDB_REGNUM_GENERIC_RA); |
| const RegisterInfo *r25_info = reg_ctx->GetRegisterInfoByName("r25", 0); |
| const RegisterInfo *r0_info = reg_ctx->GetRegisterInfoByName("zero", 0); |
| |
| LLDB_LOGF(log, "Writing R0: 0x%" PRIx64, (uint64_t)0); |
| |
| /* Write r0 with 0, in case we are stopped in syscall, |
| * such setting prevents automatic decrement of the PC. |
| * This clears the bug 23659 for MIPS. |
| */ |
| if (!reg_ctx->WriteRegisterFromUnsigned(r0_info, (uint64_t)0)) |
| return false; |
| |
| LLDB_LOGF(log, "Writing SP: 0x%" PRIx64, (uint64_t)sp); |
| |
| // Set "sp" to the requested value |
| if (!reg_ctx->WriteRegisterFromUnsigned(sp_reg_info, sp)) |
| return false; |
| |
| LLDB_LOGF(log, "Writing RA: 0x%" PRIx64, (uint64_t)return_addr); |
| |
| // Set "ra" to the return address |
| if (!reg_ctx->WriteRegisterFromUnsigned(ra_reg_info, return_addr)) |
| return false; |
| |
| LLDB_LOGF(log, "Writing PC: 0x%" PRIx64, (uint64_t)func_addr); |
| |
| // Set pc to the address of the called function. |
| if (!reg_ctx->WriteRegisterFromUnsigned(pc_reg_info, func_addr)) |
| return false; |
| |
| LLDB_LOGF(log, "Writing r25: 0x%" PRIx64, (uint64_t)func_addr); |
| |
| // All callers of position independent functions must place the address of |
| // the called function in t9 (r25) |
| if (!reg_ctx->WriteRegisterFromUnsigned(r25_info, func_addr)) |
| return false; |
| |
| return true; |
| } |
| |
| bool ABISysV_mips64::GetArgumentValues(Thread &thread, |
| ValueList &values) const { |
| return false; |
| } |
| |
| Status ABISysV_mips64::SetReturnValueObject(lldb::StackFrameSP &frame_sp, |
| lldb::ValueObjectSP &new_value_sp) { |
| Status 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(); |
| |
| RegisterContext *reg_ctx = thread->GetRegisterContext().get(); |
| |
| if (!reg_ctx) |
| error.SetErrorString("no registers are available"); |
| |
| DataExtractor data; |
| Status 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; |
| } |
| |
| const uint32_t type_flags = compiler_type.GetTypeInfo(nullptr); |
| |
| if (type_flags & eTypeIsScalar || type_flags & eTypeIsPointer) { |
| if (type_flags & eTypeIsInteger || type_flags & eTypeIsPointer) { |
| lldb::offset_t offset = 0; |
| |
| if (num_bytes <= 16) { |
| const RegisterInfo *r2_info = reg_ctx->GetRegisterInfoByName("r2", 0); |
| if (num_bytes <= 8) { |
| uint64_t raw_value = data.GetMaxU64(&offset, num_bytes); |
| |
| if (!reg_ctx->WriteRegisterFromUnsigned(r2_info, raw_value)) |
| error.SetErrorString("failed to write register r2"); |
| } else { |
| uint64_t raw_value = data.GetMaxU64(&offset, 8); |
| if (reg_ctx->WriteRegisterFromUnsigned(r2_info, raw_value)) { |
| const RegisterInfo *r3_info = |
| reg_ctx->GetRegisterInfoByName("r3", 0); |
| raw_value = data.GetMaxU64(&offset, num_bytes - offset); |
| |
| if (!reg_ctx->WriteRegisterFromUnsigned(r3_info, raw_value)) |
| error.SetErrorString("failed to write register r3"); |
| } else |
| error.SetErrorString("failed to write register r2"); |
| } |
| } else { |
| error.SetErrorString("We don't support returning longer than 128 bit " |
| "integer values at present."); |
| } |
| } else if (type_flags & eTypeIsFloat) { |
| error.SetErrorString("TODO: Handle Float Types."); |
| } |
| } else if (type_flags & eTypeIsVector) { |
| error.SetErrorString("returning vector values are not supported"); |
| } |
| |
| return error; |
| } |
| |
| ValueObjectSP ABISysV_mips64::GetReturnValueObjectSimple( |
| Thread &thread, CompilerType &return_compiler_type) const { |
| ValueObjectSP return_valobj_sp; |
| return return_valobj_sp; |
| } |
| |
| ValueObjectSP ABISysV_mips64::GetReturnValueObjectImpl( |
| Thread &thread, CompilerType &return_compiler_type) const { |
| ValueObjectSP return_valobj_sp; |
| Value value; |
| Status error; |
| |
| ExecutionContext exe_ctx(thread.shared_from_this()); |
| if (exe_ctx.GetTargetPtr() == nullptr || exe_ctx.GetProcessPtr() == nullptr) |
| return return_valobj_sp; |
| |
| value.SetCompilerType(return_compiler_type); |
| |
| RegisterContext *reg_ctx = thread.GetRegisterContext().get(); |
| if (!reg_ctx) |
| return return_valobj_sp; |
| |
| Target *target = exe_ctx.GetTargetPtr(); |
| const ArchSpec target_arch = target->GetArchitecture(); |
| ByteOrder target_byte_order = target_arch.GetByteOrder(); |
| llvm::Optional<uint64_t> byte_size = |
| return_compiler_type.GetByteSize(&thread); |
| if (!byte_size) |
| return return_valobj_sp; |
| const uint32_t type_flags = return_compiler_type.GetTypeInfo(nullptr); |
| uint32_t fp_flag = |
| target_arch.GetFlags() & lldb_private::ArchSpec::eMIPS_ABI_FP_mask; |
| |
| const RegisterInfo *r2_info = reg_ctx->GetRegisterInfoByName("r2", 0); |
| const RegisterInfo *r3_info = reg_ctx->GetRegisterInfoByName("r3", 0); |
| |
| if (type_flags & eTypeIsScalar || type_flags & eTypeIsPointer) { |
| value.SetValueType(Value::ValueType::Scalar); |
| |
| bool success = false; |
| if (type_flags & eTypeIsInteger || type_flags & eTypeIsPointer) { |
| // Extract the register context so we can read arguments from registers |
| // In MIPS register "r2" (v0) holds the integer function return values |
| |
| uint64_t raw_value = reg_ctx->ReadRegisterAsUnsigned(r2_info, 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 if (IsSoftFloat(fp_flag)) { |
| uint64_t raw_value = reg_ctx->ReadRegisterAsUnsigned(r2_info, 0); |
| switch (*byte_size) { |
| case 4: |
| value.GetScalar() = *((float *)(&raw_value)); |
| success = true; |
| break; |
| case 8: |
| value.GetScalar() = *((double *)(&raw_value)); |
| success = true; |
| break; |
| case 16: |
| uint64_t result[2]; |
| if (target_byte_order == eByteOrderLittle) { |
| result[0] = raw_value; |
| result[1] = reg_ctx->ReadRegisterAsUnsigned(r3_info, 0); |
| value.GetScalar() = *((long double *)(result)); |
| } else { |
| result[0] = reg_ctx->ReadRegisterAsUnsigned(r3_info, 0); |
| result[1] = raw_value; |
| value.GetScalar() = *((long double *)(result)); |
| } |
| success = true; |
| break; |
| } |
| |
| } else { |
| if (*byte_size <= sizeof(long double)) { |
| const RegisterInfo *f0_info = reg_ctx->GetRegisterInfoByName("f0", 0); |
| |
| RegisterValue f0_value; |
| DataExtractor f0_data; |
| |
| reg_ctx->ReadRegister(f0_info, f0_value); |
| |
| f0_value.GetData(f0_data); |
| |
| lldb::offset_t offset = 0; |
| if (*byte_size == sizeof(float)) { |
| value.GetScalar() = (float)f0_data.GetFloat(&offset); |
| success = true; |
| } else if (*byte_size == sizeof(double)) { |
| value.GetScalar() = (double)f0_data.GetDouble(&offset); |
| success = true; |
| } else if (*byte_size == sizeof(long double)) { |
| const RegisterInfo *f2_info = |
| reg_ctx->GetRegisterInfoByName("f2", 0); |
| RegisterValue f2_value; |
| DataExtractor f2_data; |
| reg_ctx->ReadRegister(f2_info, f2_value); |
| DataExtractor *copy_from_extractor = nullptr; |
| DataBufferSP data_sp(new DataBufferHeap(16, 0)); |
| DataExtractor return_ext( |
| data_sp, target_byte_order, |
| target->GetArchitecture().GetAddressByteSize()); |
| |
| if (target_byte_order == eByteOrderLittle) { |
| copy_from_extractor = &f0_data; |
| copy_from_extractor->CopyByteOrderedData( |
| 0, 8, data_sp->GetBytes(), *byte_size - 8, target_byte_order); |
| f2_value.GetData(f2_data); |
| copy_from_extractor = &f2_data; |
| copy_from_extractor->CopyByteOrderedData( |
| 0, 8, data_sp->GetBytes() + 8, *byte_size - 8, |
| target_byte_order); |
| } else { |
| copy_from_extractor = &f0_data; |
| copy_from_extractor->CopyByteOrderedData( |
| 0, 8, data_sp->GetBytes() + 8, *byte_size - 8, |
| target_byte_order); |
| f2_value.GetData(f2_data); |
| copy_from_extractor = &f2_data; |
| copy_from_extractor->CopyByteOrderedData( |
| 0, 8, data_sp->GetBytes(), *byte_size - 8, target_byte_order); |
| } |
| |
| return_valobj_sp = ValueObjectConstResult::Create( |
| &thread, return_compiler_type, ConstString(""), return_ext); |
| return return_valobj_sp; |
| } |
| } |
| } |
| } |
| |
| if (success) |
| return_valobj_sp = ValueObjectConstResult::Create( |
| thread.GetStackFrameAtIndex(0).get(), value, ConstString("")); |
| } else if (type_flags & eTypeIsStructUnion || type_flags & eTypeIsClass || |
| type_flags & eTypeIsVector) { |
| // Any structure of up to 16 bytes in size is returned in the registers. |
| if (*byte_size <= 16) { |
| DataBufferSP data_sp(new DataBufferHeap(16, 0)); |
| DataExtractor return_ext(data_sp, target_byte_order, |
| target->GetArchitecture().GetAddressByteSize()); |
| |
| RegisterValue r2_value, r3_value, f0_value, f1_value, f2_value; |
| // Tracks how much bytes of r2 and r3 registers we've consumed so far |
| uint32_t integer_bytes = 0; |
| |
| // True if return values are in FP return registers. |
| bool use_fp_regs = false; |
| // True if we found any non floating point field in structure. |
| bool found_non_fp_field = false; |
| // True if return values are in r2 register. |
| bool use_r2 = false; |
| // True if return values are in r3 register. |
| bool use_r3 = false; |
| // True if the result is copied into our data buffer |
| bool sucess = false; |
| std::string name; |
| bool is_complex; |
| uint32_t count; |
| const uint32_t num_children = return_compiler_type.GetNumFields(); |
| |
| // A structure consisting of one or two FP values (and nothing else) will |
| // be returned in the two FP return-value registers i.e fp0 and fp2. |
| if (num_children <= 2) { |
| uint64_t field_bit_offset = 0; |
| |
| // Check if this structure contains only floating point fields |
| for (uint32_t idx = 0; idx < num_children; idx++) { |
| CompilerType field_compiler_type = |
| return_compiler_type.GetFieldAtIndex(idx, name, &field_bit_offset, |
| nullptr, nullptr); |
| |
| if (field_compiler_type.IsFloatingPointType(count, is_complex)) |
| use_fp_regs = true; |
| else |
| found_non_fp_field = true; |
| } |
| |
| if (use_fp_regs && !found_non_fp_field) { |
| // We have one or two FP-only values in this structure. Get it from |
| // f0/f2 registers. |
| DataExtractor f0_data, f1_data, f2_data; |
| const RegisterInfo *f0_info = reg_ctx->GetRegisterInfoByName("f0", 0); |
| const RegisterInfo *f1_info = reg_ctx->GetRegisterInfoByName("f1", 0); |
| const RegisterInfo *f2_info = reg_ctx->GetRegisterInfoByName("f2", 0); |
| |
| reg_ctx->ReadRegister(f0_info, f0_value); |
| reg_ctx->ReadRegister(f2_info, f2_value); |
| |
| f0_value.GetData(f0_data); |
| |
| for (uint32_t idx = 0; idx < num_children; idx++) { |
| CompilerType field_compiler_type = |
| return_compiler_type.GetFieldAtIndex( |
| idx, name, &field_bit_offset, nullptr, nullptr); |
| llvm::Optional<uint64_t> field_byte_width = |
| field_compiler_type.GetByteSize(&thread); |
| if (!field_byte_width) |
| return return_valobj_sp; |
| |
| DataExtractor *copy_from_extractor = nullptr; |
| uint64_t return_value[2]; |
| offset_t offset = 0; |
| |
| if (idx == 0) { |
| // This case is for long double type. |
| if (*field_byte_width == 16) { |
| |
| // If structure contains long double type, then it is returned |
| // in fp0/fp1 registers. |
| if (target_byte_order == eByteOrderLittle) { |
| return_value[0] = f0_data.GetU64(&offset); |
| reg_ctx->ReadRegister(f1_info, f1_value); |
| f1_value.GetData(f1_data); |
| offset = 0; |
| return_value[1] = f1_data.GetU64(&offset); |
| } else { |
| return_value[1] = f0_data.GetU64(&offset); |
| reg_ctx->ReadRegister(f1_info, f1_value); |
| f1_value.GetData(f1_data); |
| offset = 0; |
| return_value[0] = f1_data.GetU64(&offset); |
| } |
| |
| f0_data.SetData(return_value, *field_byte_width, |
| target_byte_order); |
| } |
| copy_from_extractor = &f0_data; // This is in f0, copy from |
| // register to our result |
| // structure |
| } else { |
| f2_value.GetData(f2_data); |
| // This is in f2, copy from register to our result structure |
| copy_from_extractor = &f2_data; |
| } |
| |
| // Sanity check to avoid crash |
| if (!copy_from_extractor || |
| *field_byte_width > copy_from_extractor->GetByteSize()) |
| return return_valobj_sp; |
| |
| // copy the register contents into our data buffer |
| copy_from_extractor->CopyByteOrderedData( |
| 0, *field_byte_width, |
| data_sp->GetBytes() + (field_bit_offset / 8), *field_byte_width, |
| target_byte_order); |
| } |
| |
| // The result is in our data buffer. Create a variable object out of |
| // it |
| return_valobj_sp = ValueObjectConstResult::Create( |
| &thread, return_compiler_type, ConstString(""), return_ext); |
| |
| return return_valobj_sp; |
| } |
| } |
| |
| // If we reach here, it means this structure either contains more than |
| // two fields or it contains at least one non floating point type. In |
| // that case, all fields are returned in GP return registers. |
| for (uint32_t idx = 0; idx < num_children; idx++) { |
| uint64_t field_bit_offset = 0; |
| bool is_signed; |
| uint32_t padding; |
| |
| CompilerType field_compiler_type = return_compiler_type.GetFieldAtIndex( |
| idx, name, &field_bit_offset, nullptr, nullptr); |
| llvm::Optional<uint64_t> field_byte_width = |
| field_compiler_type.GetByteSize(&thread); |
| |
| // if we don't know the size of the field (e.g. invalid type), just |
| // bail out |
| if (!field_byte_width || *field_byte_width == 0) |
| break; |
| |
| uint32_t field_byte_offset = field_bit_offset / 8; |
| |
| if (field_compiler_type.IsIntegerOrEnumerationType(is_signed) || |
| field_compiler_type.IsPointerType() || |
| field_compiler_type.IsFloatingPointType(count, is_complex)) { |
| padding = field_byte_offset - integer_bytes; |
| |
| if (integer_bytes < 8) { |
| // We have not yet consumed r2 completely. |
| if (integer_bytes + *field_byte_width + padding <= 8) { |
| // This field fits in r2, copy its value from r2 to our result |
| // structure |
| integer_bytes = integer_bytes + *field_byte_width + |
| padding; // Increase the consumed bytes. |
| use_r2 = true; |
| } else { |
| // There isn't enough space left in r2 for this field, so this |
| // will be in r3. |
| integer_bytes = integer_bytes + *field_byte_width + |
| padding; // Increase the consumed bytes. |
| use_r3 = true; |
| } |
| } |
| // We already have consumed at-least 8 bytes that means r2 is done, |
| // and this field will be in r3. Check if this field can fit in r3. |
| else if (integer_bytes + *field_byte_width + padding <= 16) { |
| integer_bytes = integer_bytes + *field_byte_width + padding; |
| use_r3 = true; |
| } else { |
| // There isn't any space left for this field, this should not |
| // happen as we have already checked the overall size is not |
| // greater than 16 bytes. For now, return a nullptr return value |
| // object. |
| return return_valobj_sp; |
| } |
| } |
| } |
| // Vector types up to 16 bytes are returned in GP return registers |
| if (type_flags & eTypeIsVector) { |
| if (*byte_size <= 8) |
| use_r2 = true; |
| else { |
| use_r2 = true; |
| use_r3 = true; |
| } |
| } |
| |
| if (use_r2) { |
| reg_ctx->ReadRegister(r2_info, r2_value); |
| |
| const size_t bytes_copied = r2_value.GetAsMemoryData( |
| r2_info, data_sp->GetBytes(), r2_info->byte_size, target_byte_order, |
| error); |
| if (bytes_copied != r2_info->byte_size) |
| return return_valobj_sp; |
| sucess = true; |
| } |
| if (use_r3) { |
| reg_ctx->ReadRegister(r3_info, r3_value); |
| const size_t bytes_copied = r3_value.GetAsMemoryData( |
| r3_info, data_sp->GetBytes() + r2_info->byte_size, |
| r3_info->byte_size, target_byte_order, error); |
| |
| if (bytes_copied != r3_info->byte_size) |
| return return_valobj_sp; |
| sucess = true; |
| } |
| if (sucess) { |
| // The result is in our data buffer. Create a variable object out of |
| // it |
| return_valobj_sp = ValueObjectConstResult::Create( |
| &thread, return_compiler_type, ConstString(""), return_ext); |
| } |
| return return_valobj_sp; |
| } |
| |
| // Any structure/vector greater than 16 bytes in size is returned in |
| // memory. The pointer to that memory is returned in r2. |
| uint64_t mem_address = reg_ctx->ReadRegisterAsUnsigned( |
| reg_ctx->GetRegisterInfoByName("r2", 0), 0); |
| |
| // We have got the address. Create a memory object out of it |
| return_valobj_sp = ValueObjectMemory::Create( |
| &thread, "", Address(mem_address, nullptr), return_compiler_type); |
| } |
| return return_valobj_sp; |
| } |
| |
| bool ABISysV_mips64::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 |
| row->GetCFAValue().SetIsRegisterPlusOffset(dwarf_r29, 0); |
| |
| // The previous PC is in the RA |
| row->SetRegisterLocationToRegister(dwarf_pc, dwarf_r31, true); |
| unwind_plan.AppendRow(row); |
| |
| // All other registers are the same. |
| |
| unwind_plan.SetSourceName("mips64 at-func-entry default"); |
| unwind_plan.SetSourcedFromCompiler(eLazyBoolNo); |
| unwind_plan.SetReturnAddressRegister(dwarf_r31); |
| return true; |
| } |
| |
| bool ABISysV_mips64::CreateDefaultUnwindPlan(UnwindPlan &unwind_plan) { |
| unwind_plan.Clear(); |
| unwind_plan.SetRegisterKind(eRegisterKindDWARF); |
| |
| UnwindPlan::RowSP row(new UnwindPlan::Row); |
| |
| row->GetCFAValue().SetIsRegisterPlusOffset(dwarf_r29, 0); |
| |
| row->SetRegisterLocationToRegister(dwarf_pc, dwarf_r31, true); |
| |
| unwind_plan.AppendRow(row); |
| unwind_plan.SetSourceName("mips64 default unwind plan"); |
| unwind_plan.SetSourcedFromCompiler(eLazyBoolNo); |
| unwind_plan.SetUnwindPlanValidAtAllInstructions(eLazyBoolNo); |
| unwind_plan.SetUnwindPlanForSignalTrap(eLazyBoolNo); |
| return true; |
| } |
| |
| bool ABISysV_mips64::RegisterIsVolatile(const RegisterInfo *reg_info) { |
| return !RegisterIsCalleeSaved(reg_info); |
| } |
| |
| bool ABISysV_mips64::IsSoftFloat(uint32_t fp_flag) const { |
| return (fp_flag == lldb_private::ArchSpec::eMIPS_ABI_FP_SOFT); |
| } |
| |
| bool ABISysV_mips64::RegisterIsCalleeSaved(const RegisterInfo *reg_info) { |
| if (reg_info) { |
| // Preserved registers are : |
| // r16-r23, r28, r29, r30, r31 |
| |
| int reg = ((reg_info->byte_offset) / 8); |
| |
| bool save = (reg >= 16) && (reg <= 23); |
| save |= (reg >= 28) && (reg <= 31); |
| |
| return save; |
| } |
| return false; |
| } |
| |
| void ABISysV_mips64::Initialize() { |
| PluginManager::RegisterPlugin( |
| GetPluginNameStatic(), "System V ABI for mips64 targets", CreateInstance); |
| } |
| |
| void ABISysV_mips64::Terminate() { |
| PluginManager::UnregisterPlugin(CreateInstance); |
| } |
| |
| lldb_private::ConstString ABISysV_mips64::GetPluginNameStatic() { |
| static ConstString g_name("sysv-mips64"); |
| return g_name; |
| } |
| |
| // PluginInterface protocol |
| |
| lldb_private::ConstString ABISysV_mips64::GetPluginName() { |
| return GetPluginNameStatic(); |
| } |
| |
| uint32_t ABISysV_mips64::GetPluginVersion() { return 1; } |
