| //===-- ABISysV_mips.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_mips.h" |
| |
| #include "llvm/ADT/STLExtras.h" |
| #include "llvm/TargetParser/Triple.h" |
| |
| #include "lldb/Core/Module.h" |
| #include "lldb/Core/PluginManager.h" |
| #include "lldb/Core/Value.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/LLDBLog.h" |
| #include "lldb/Utility/Log.h" |
| #include "lldb/Utility/RegisterValue.h" |
| #include "lldb/Utility/Status.h" |
| #include "lldb/ValueObject/ValueObjectConstResult.h" |
| #include "lldb/ValueObject/ValueObjectMemory.h" |
| #include "lldb/ValueObject/ValueObjectRegister.h" |
| #include <optional> |
| |
| using namespace lldb; |
| using namespace lldb_private; |
| |
| LLDB_PLUGIN_DEFINE(ABISysV_mips) |
| |
| 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[] = { |
| {"r0", |
| "zero", |
| 4, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_r0, dwarf_r0, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| }, |
| {"r1", |
| "AT", |
| 4, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_r1, dwarf_r1, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| }, |
| {"r2", |
| "v0", |
| 4, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_r2, dwarf_r2, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| }, |
| {"r3", |
| "v1", |
| 4, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_r3, dwarf_r3, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| }, |
| {"r4", |
| nullptr, |
| 4, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_r4, dwarf_r4, LLDB_REGNUM_GENERIC_ARG1, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| }, |
| {"r5", |
| nullptr, |
| 4, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_r5, dwarf_r5, LLDB_REGNUM_GENERIC_ARG2, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| }, |
| {"r6", |
| nullptr, |
| 4, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_r6, dwarf_r6, LLDB_REGNUM_GENERIC_ARG3, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| }, |
| {"r7", |
| nullptr, |
| 4, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_r7, dwarf_r7, LLDB_REGNUM_GENERIC_ARG4, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| }, |
| {"r8", |
| "arg5", |
| 4, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_r8, dwarf_r8, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| }, |
| {"r9", |
| "arg6", |
| 4, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_r9, dwarf_r9, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| }, |
| {"r10", |
| "arg7", |
| 4, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_r10, dwarf_r10, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| }, |
| {"r11", |
| "arg8", |
| 4, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_r11, dwarf_r11, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| }, |
| {"r12", |
| nullptr, |
| 4, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_r12, dwarf_r12, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| }, |
| {"r13", |
| nullptr, |
| 4, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_r13, dwarf_r13, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| }, |
| {"r14", |
| nullptr, |
| 4, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_r14, dwarf_r14, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| }, |
| {"r15", |
| nullptr, |
| 4, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_r15, dwarf_r15, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| }, |
| {"r16", |
| nullptr, |
| 4, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_r16, dwarf_r16, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| }, |
| {"r17", |
| nullptr, |
| 4, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_r17, dwarf_r17, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| }, |
| {"r18", |
| nullptr, |
| 4, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_r18, dwarf_r18, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| }, |
| {"r19", |
| nullptr, |
| 4, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_r19, dwarf_r19, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| }, |
| {"r20", |
| nullptr, |
| 4, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_r20, dwarf_r20, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| }, |
| {"r21", |
| nullptr, |
| 4, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_r21, dwarf_r21, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| }, |
| {"r22", |
| nullptr, |
| 4, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_r22, dwarf_r22, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| }, |
| {"r23", |
| nullptr, |
| 4, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_r23, dwarf_r23, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| }, |
| {"r24", |
| nullptr, |
| 4, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_r24, dwarf_r24, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| }, |
| {"r25", |
| nullptr, |
| 4, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_r25, dwarf_r25, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| }, |
| {"r26", |
| nullptr, |
| 4, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_r26, dwarf_r26, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| }, |
| {"r27", |
| nullptr, |
| 4, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_r27, dwarf_r27, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| }, |
| {"r28", |
| "gp", |
| 4, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_r28, dwarf_r28, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| }, |
| {"r29", |
| nullptr, |
| 4, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_r29, dwarf_r29, LLDB_REGNUM_GENERIC_SP, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| }, |
| {"r30", |
| nullptr, |
| 4, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_r30, dwarf_r30, LLDB_REGNUM_GENERIC_FP, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| }, |
| {"r31", |
| nullptr, |
| 4, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_r31, dwarf_r31, LLDB_REGNUM_GENERIC_RA, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| }, |
| {"sr", |
| nullptr, |
| 4, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_sr, dwarf_sr, LLDB_REGNUM_GENERIC_FLAGS, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| }, |
| {"lo", |
| nullptr, |
| 4, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_lo, dwarf_lo, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| }, |
| {"hi", |
| nullptr, |
| 4, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_hi, dwarf_hi, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| }, |
| {"bad", |
| nullptr, |
| 4, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_bad, dwarf_bad, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| }, |
| {"cause", |
| nullptr, |
| 4, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_cause, dwarf_cause, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| }, |
| {"pc", |
| nullptr, |
| 4, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_pc, dwarf_pc, LLDB_REGNUM_GENERIC_PC, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| }, |
| }; |
| |
| static const uint32_t k_num_register_infos = std::size(g_register_infos); |
| |
| const lldb_private::RegisterInfo * |
| ABISysV_mips::GetRegisterInfoArray(uint32_t &count) { |
| count = k_num_register_infos; |
| return g_register_infos; |
| } |
| |
| size_t ABISysV_mips::GetRedZoneSize() const { return 0; } |
| |
| // Static Functions |
| |
| ABISP |
| ABISysV_mips::CreateInstance(lldb::ProcessSP process_sp, const ArchSpec &arch) { |
| const llvm::Triple::ArchType arch_type = arch.GetTriple().getArch(); |
| if ((arch_type == llvm::Triple::mips) || |
| (arch_type == llvm::Triple::mipsel)) { |
| return ABISP( |
| new ABISysV_mips(std::move(process_sp), MakeMCRegisterInfo(arch))); |
| } |
| return ABISP(); |
| } |
| |
| bool ABISysV_mips::PrepareTrivialCall(Thread &thread, addr_t sp, |
| addr_t func_addr, addr_t return_addr, |
| llvm::ArrayRef<addr_t> args) const { |
| Log *log = GetLog(LLDBLog::Expressions); |
| |
| if (log) { |
| StreamString s; |
| s.Printf("ABISysV_mips::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; |
| |
| RegisterValue reg_value; |
| |
| // Argument registers |
| const char *reg_names[] = {"r4", "r5", "r6", "r7"}; |
| |
| llvm::ArrayRef<addr_t>::iterator ai = args.begin(), ae = args.end(); |
| |
| // Write arguments to registers |
| for (size_t i = 0; i < std::size(reg_names); ++i) { |
| if (ai == ae) |
| break; |
| |
| 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; |
| |
| ++ai; |
| } |
| |
| // If we have more than 4 arguments --Spill onto the stack |
| if (ai != ae) { |
| // No of arguments to go on stack |
| size_t num_stack_regs = args.size(); |
| |
| // Allocate needed space for args on the stack |
| sp -= (num_stack_regs * 4); |
| |
| // Keep the stack 8 byte aligned |
| sp &= ~(8ull - 1ull); |
| |
| // just using arg1 to get the right size |
| const RegisterInfo *reg_info = reg_ctx->GetRegisterInfo( |
| eRegisterKindGeneric, LLDB_REGNUM_GENERIC_ARG1); |
| |
| addr_t arg_pos = sp + 16; |
| |
| size_t i = 4; |
| for (; ai != ae; ++ai) { |
| reg_value.SetUInt32(*ai); |
| LLDB_LOGF(log, "About to write arg%zd (0x%" PRIx64 ") at 0x%" PRIx64 "", |
| i + 1, args[i], arg_pos); |
| |
| if (reg_ctx |
| ->WriteRegisterValueToMemory(reg_info, arg_pos, |
| reg_info->byte_size, reg_value) |
| .Fail()) |
| return false; |
| arg_pos += reg_info->byte_size; |
| i++; |
| } |
| } |
| |
| 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_mips::GetArgumentValues(Thread &thread, ValueList &values) const { |
| return false; |
| } |
| |
| Status ABISysV_mips::SetReturnValueObject(lldb::StackFrameSP &frame_sp, |
| lldb::ValueObjectSP &new_value_sp) { |
| Status error; |
| if (!new_value_sp) { |
| error = Status::FromErrorString("Empty value object for return value."); |
| return error; |
| } |
| |
| CompilerType compiler_type = new_value_sp->GetCompilerType(); |
| if (!compiler_type) { |
| error = Status::FromErrorString("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()) { |
| DataExtractor data; |
| Status data_error; |
| size_t num_bytes = new_value_sp->GetData(data, data_error); |
| if (data_error.Fail()) { |
| error = Status::FromErrorStringWithFormat( |
| "Couldn't convert return value to raw data: %s", |
| data_error.AsCString()); |
| return error; |
| } |
| |
| lldb::offset_t offset = 0; |
| if (num_bytes <= 8) { |
| const RegisterInfo *r2_info = reg_ctx->GetRegisterInfoByName("r2", 0); |
| if (num_bytes <= 4) { |
| uint32_t raw_value = data.GetMaxU32(&offset, num_bytes); |
| |
| if (reg_ctx->WriteRegisterFromUnsigned(r2_info, raw_value)) |
| set_it_simple = true; |
| } else { |
| uint32_t raw_value = data.GetMaxU32(&offset, 4); |
| |
| if (reg_ctx->WriteRegisterFromUnsigned(r2_info, raw_value)) { |
| const RegisterInfo *r3_info = reg_ctx->GetRegisterInfoByName("r3", 0); |
| uint32_t raw_value = data.GetMaxU32(&offset, num_bytes - offset); |
| |
| if (reg_ctx->WriteRegisterFromUnsigned(r3_info, raw_value)) |
| set_it_simple = true; |
| } |
| } |
| } else { |
| error = Status::FromErrorString( |
| "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 = Status::FromErrorString( |
| "We don't support returning complex values at present"); |
| else |
| error = Status::FromErrorString( |
| "We don't support returning float values at present"); |
| } |
| |
| if (!set_it_simple) |
| error = Status::FromErrorString( |
| "We only support setting simple integer return types at present."); |
| |
| return error; |
| } |
| |
| ValueObjectSP ABISysV_mips::GetReturnValueObjectSimple( |
| Thread &thread, CompilerType &return_compiler_type) const { |
| ValueObjectSP return_valobj_sp; |
| return return_valobj_sp; |
| } |
| |
| ValueObjectSP ABISysV_mips::GetReturnValueObjectImpl( |
| Thread &thread, CompilerType &return_compiler_type) const { |
| ValueObjectSP return_valobj_sp; |
| Value value; |
| |
| if (!return_compiler_type) |
| return return_valobj_sp; |
| |
| ExecutionContext exe_ctx(thread.shared_from_this()); |
| if (exe_ctx.GetTargetPtr() == nullptr || exe_ctx.GetProcessPtr() == nullptr) |
| return return_valobj_sp; |
| |
| Target *target = exe_ctx.GetTargetPtr(); |
| const ArchSpec target_arch = target->GetArchitecture(); |
| ByteOrder target_byte_order = target_arch.GetByteOrder(); |
| value.SetCompilerType(return_compiler_type); |
| uint32_t fp_flag = |
| target_arch.GetFlags() & lldb_private::ArchSpec::eMIPS_ABI_FP_mask; |
| |
| RegisterContext *reg_ctx = thread.GetRegisterContext().get(); |
| if (!reg_ctx) |
| return return_valobj_sp; |
| |
| bool is_signed = false; |
| bool is_complex = false; |
| uint32_t count = 0; |
| |
| // In MIPS register "r2" (v0) holds the integer function return values |
| const RegisterInfo *r2_reg_info = reg_ctx->GetRegisterInfoByName("r2", 0); |
| std::optional<uint64_t> bit_width = |
| llvm::expectedToOptional(return_compiler_type.GetBitSize(&thread)); |
| if (!bit_width) |
| return return_valobj_sp; |
| if (return_compiler_type.IsIntegerOrEnumerationType(is_signed)) { |
| switch (*bit_width) { |
| default: |
| return return_valobj_sp; |
| case 64: { |
| const RegisterInfo *r3_reg_info = reg_ctx->GetRegisterInfoByName("r3", 0); |
| uint64_t raw_value; |
| raw_value = reg_ctx->ReadRegisterAsUnsigned(r2_reg_info, 0) & UINT32_MAX; |
| raw_value |= ((uint64_t)(reg_ctx->ReadRegisterAsUnsigned(r3_reg_info, 0) & |
| UINT32_MAX)) |
| << 32; |
| if (is_signed) |
| value.GetScalar() = (int64_t)raw_value; |
| else |
| value.GetScalar() = (uint64_t)raw_value; |
| } break; |
| case 32: |
| if (is_signed) |
| value.GetScalar() = (int32_t)( |
| reg_ctx->ReadRegisterAsUnsigned(r2_reg_info, 0) & UINT32_MAX); |
| else |
| value.GetScalar() = (uint32_t)( |
| reg_ctx->ReadRegisterAsUnsigned(r2_reg_info, 0) & UINT32_MAX); |
| break; |
| case 16: |
| if (is_signed) |
| value.GetScalar() = (int16_t)( |
| reg_ctx->ReadRegisterAsUnsigned(r2_reg_info, 0) & UINT16_MAX); |
| else |
| value.GetScalar() = (uint16_t)( |
| reg_ctx->ReadRegisterAsUnsigned(r2_reg_info, 0) & UINT16_MAX); |
| break; |
| case 8: |
| if (is_signed) |
| value.GetScalar() = (int8_t)( |
| reg_ctx->ReadRegisterAsUnsigned(r2_reg_info, 0) & UINT8_MAX); |
| else |
| value.GetScalar() = (uint8_t)( |
| reg_ctx->ReadRegisterAsUnsigned(r2_reg_info, 0) & UINT8_MAX); |
| break; |
| } |
| } else if (return_compiler_type.IsPointerType()) { |
| uint32_t ptr = |
| thread.GetRegisterContext()->ReadRegisterAsUnsigned(r2_reg_info, 0) & |
| UINT32_MAX; |
| value.GetScalar() = ptr; |
| } else if (return_compiler_type.IsAggregateType()) { |
| // Structure/Vector is always passed in memory and pointer to that memory |
| // is passed 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; |
| } else if (return_compiler_type.IsFloatingPointType(count, is_complex)) { |
| if (IsSoftFloat(fp_flag)) { |
| uint64_t raw_value = reg_ctx->ReadRegisterAsUnsigned(r2_reg_info, 0); |
| if (count != 1 && is_complex) |
| return return_valobj_sp; |
| switch (*bit_width) { |
| default: |
| return return_valobj_sp; |
| case 32: |
| static_assert(sizeof(float) == sizeof(uint32_t)); |
| value.GetScalar() = *((float *)(&raw_value)); |
| break; |
| case 64: |
| static_assert(sizeof(double) == sizeof(uint64_t)); |
| const RegisterInfo *r3_reg_info = |
| reg_ctx->GetRegisterInfoByName("r3", 0); |
| if (target_byte_order == eByteOrderLittle) |
| raw_value = |
| ((reg_ctx->ReadRegisterAsUnsigned(r3_reg_info, 0)) << 32) | |
| raw_value; |
| else |
| raw_value = (raw_value << 32) | |
| reg_ctx->ReadRegisterAsUnsigned(r3_reg_info, 0); |
| value.GetScalar() = *((double *)(&raw_value)); |
| break; |
| } |
| } |
| |
| else { |
| 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 (count == 1 && !is_complex) { |
| switch (*bit_width) { |
| default: |
| return return_valobj_sp; |
| case 64: { |
| static_assert(sizeof(double) == sizeof(uint64_t)); |
| const RegisterInfo *f1_info = reg_ctx->GetRegisterInfoByName("f1", 0); |
| RegisterValue f1_value; |
| DataExtractor f1_data; |
| reg_ctx->ReadRegister(f1_info, f1_value); |
| DataExtractor *copy_from_extractor = nullptr; |
| WritableDataBufferSP data_sp(new DataBufferHeap(8, 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( |
| offset, 4, data_sp->GetBytes(), 4, target_byte_order); |
| f1_value.GetData(f1_data); |
| copy_from_extractor = &f1_data; |
| copy_from_extractor->CopyByteOrderedData( |
| offset, 4, data_sp->GetBytes() + 4, 4, target_byte_order); |
| } else { |
| copy_from_extractor = &f0_data; |
| copy_from_extractor->CopyByteOrderedData( |
| offset, 4, data_sp->GetBytes() + 4, 4, target_byte_order); |
| f1_value.GetData(f1_data); |
| copy_from_extractor = &f1_data; |
| copy_from_extractor->CopyByteOrderedData( |
| offset, 4, data_sp->GetBytes(), 4, target_byte_order); |
| } |
| value.GetScalar() = (double)return_ext.GetDouble(&offset); |
| break; |
| } |
| case 32: { |
| static_assert(sizeof(float) == sizeof(uint32_t)); |
| value.GetScalar() = (float)f0_data.GetFloat(&offset); |
| break; |
| } |
| } |
| } else { |
| // not handled yet |
| return return_valobj_sp; |
| } |
| } |
| } else { |
| // not handled yet |
| return return_valobj_sp; |
| } |
| |
| // If we get here, we have a valid Value, so make our ValueObject out of it: |
| |
| return_valobj_sp = ValueObjectConstResult::Create( |
| thread.GetStackFrameAtIndex(0).get(), value, ConstString("")); |
| return return_valobj_sp; |
| } |
| |
| UnwindPlanSP ABISysV_mips::CreateFunctionEntryUnwindPlan() { |
| UnwindPlan::Row row; |
| |
| // Our Call Frame Address is the stack pointer value |
| row.GetCFAValue().SetIsRegisterPlusOffset(dwarf_r29, 0); |
| |
| // The previous PC is in the RA, all other registers are the same. |
| row.SetRegisterLocationToRegister(dwarf_pc, dwarf_r31, true); |
| |
| auto plan_sp = std::make_shared<UnwindPlan>(eRegisterKindDWARF); |
| plan_sp->AppendRow(std::move(row)); |
| plan_sp->SetSourceName("mips at-func-entry default"); |
| plan_sp->SetSourcedFromCompiler(eLazyBoolNo); |
| plan_sp->SetReturnAddressRegister(dwarf_r31); |
| return plan_sp; |
| } |
| |
| UnwindPlanSP ABISysV_mips::CreateDefaultUnwindPlan() { |
| UnwindPlan::Row row; |
| |
| row.SetUnspecifiedRegistersAreUndefined(true); |
| row.GetCFAValue().SetIsRegisterPlusOffset(dwarf_r29, 0); |
| |
| row.SetRegisterLocationToRegister(dwarf_pc, dwarf_r31, true); |
| |
| auto plan_sp = std::make_shared<UnwindPlan>(eRegisterKindDWARF); |
| plan_sp->AppendRow(std::move(row)); |
| plan_sp->SetSourceName("mips default unwind plan"); |
| plan_sp->SetSourcedFromCompiler(eLazyBoolNo); |
| plan_sp->SetUnwindPlanValidAtAllInstructions(eLazyBoolNo); |
| plan_sp->SetUnwindPlanForSignalTrap(eLazyBoolNo); |
| return plan_sp; |
| } |
| |
| bool ABISysV_mips::RegisterIsVolatile(const RegisterInfo *reg_info) { |
| return !RegisterIsCalleeSaved(reg_info); |
| } |
| |
| bool ABISysV_mips::IsSoftFloat(uint32_t fp_flags) const { |
| return (fp_flags == lldb_private::ArchSpec::eMIPS_ABI_FP_SOFT); |
| } |
| |
| bool ABISysV_mips::RegisterIsCalleeSaved(const RegisterInfo *reg_info) { |
| if (reg_info) { |
| // Preserved registers are : |
| // r16-r23, r28, r29, r30, r31 |
| const char *name = reg_info->name; |
| |
| if (name[0] == 'r') { |
| switch (name[1]) { |
| case '1': |
| if (name[2] == '6' || name[2] == '7' || name[2] == '8' || |
| name[2] == '9') // r16-r19 |
| return name[3] == '\0'; |
| break; |
| case '2': |
| if (name[2] == '0' || name[2] == '1' || name[2] == '2' || |
| name[2] == '3' // r20-r23 |
| || name[2] == '8' || name[2] == '9') // r28 and r29 |
| return name[3] == '\0'; |
| break; |
| case '3': |
| if (name[2] == '0' || name[2] == '1') // r30 and r31 |
| return name[3] == '\0'; |
| break; |
| } |
| |
| if (name[0] == 'g' && name[1] == 'p' && name[2] == '\0') // gp (r28) |
| return true; |
| if (name[0] == 's' && name[1] == 'p' && name[2] == '\0') // sp (r29) |
| return true; |
| if (name[0] == 'f' && name[1] == 'p' && name[2] == '\0') // fp (r30) |
| return true; |
| if (name[0] == 'r' && name[1] == 'a' && name[2] == '\0') // ra (r31) |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| void ABISysV_mips::Initialize() { |
| PluginManager::RegisterPlugin( |
| GetPluginNameStatic(), "System V ABI for mips targets", CreateInstance); |
| } |
| |
| void ABISysV_mips::Terminate() { |
| PluginManager::UnregisterPlugin(CreateInstance); |
| } |
