813 lines
36 KiB
C++
813 lines
36 KiB
C++
//===-- ABISysV_mips64.cpp ----------------------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "ABISysV_mips64.h"
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#include "lldb/Core/ConstString.h"
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#include "lldb/Core/DataExtractor.h"
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#include "lldb/Core/Error.h"
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#include "lldb/Core/Log.h"
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#include "lldb/Core/Module.h"
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#include "lldb/Core/PluginManager.h"
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#include "lldb/Core/RegisterValue.h"
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#include "lldb/Core/Value.h"
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#include "lldb/Core/ValueObjectConstResult.h"
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#include "lldb/Core/ValueObjectRegister.h"
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#include "lldb/Core/ValueObjectMemory.h"
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#include "lldb/Symbol/UnwindPlan.h"
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#include "lldb/Target/Target.h"
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#include "lldb/Target/Process.h"
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#include "lldb/Target/RegisterContext.h"
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#include "lldb/Target/StackFrame.h"
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#include "lldb/Target/Thread.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/ADT/Triple.h"
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using namespace lldb;
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using namespace lldb_private;
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enum dwarf_regnums
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{
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dwarf_r0 = 0,
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dwarf_r1,
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dwarf_r2,
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dwarf_r3,
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dwarf_r4,
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dwarf_r5,
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dwarf_r6,
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dwarf_r7,
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dwarf_r8,
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dwarf_r9,
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dwarf_r10,
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dwarf_r11,
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dwarf_r12,
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dwarf_r13,
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dwarf_r14,
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dwarf_r15,
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dwarf_r16,
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dwarf_r17,
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dwarf_r18,
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dwarf_r19,
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dwarf_r20,
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dwarf_r21,
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dwarf_r22,
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dwarf_r23,
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dwarf_r24,
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dwarf_r25,
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dwarf_r26,
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dwarf_r27,
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dwarf_r28,
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dwarf_r29,
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dwarf_r30,
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dwarf_r31,
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dwarf_sr,
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dwarf_lo,
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dwarf_hi,
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dwarf_bad,
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dwarf_cause,
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dwarf_pc
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};
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static const RegisterInfo
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g_register_infos_mips64[] =
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{
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// NAME ALT SZ OFF ENCODING FORMAT EH_FRAME DWARF GENERIC PROCESS PLUGIN LLDB NATIVE VALUE REGS INVALIDATE REGS
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// ======== ====== == === ============= ========== ============= ================= ==================== ================= ==================== ========== ===============
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{ "r0" , "zero", 8, 0, eEncodingUint, eFormatHex, { dwarf_r0, dwarf_r0, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM }, NULL, NULL},
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{ "r1" , "AT", 8, 0, eEncodingUint, eFormatHex, { dwarf_r1, dwarf_r1, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM }, NULL, NULL},
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{ "r2" , "v0", 8, 0, eEncodingUint, eFormatHex, { dwarf_r2, dwarf_r2, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM }, NULL, NULL},
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{ "r3" , "v1", 8, 0, eEncodingUint, eFormatHex, { dwarf_r3, dwarf_r3, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM }, NULL, NULL},
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{ "r4" , "arg1", 8, 0, eEncodingUint, eFormatHex, { dwarf_r4, dwarf_r4, LLDB_REGNUM_GENERIC_ARG1, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM }, NULL, NULL},
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{ "r5" , "arg2", 8, 0, eEncodingUint, eFormatHex, { dwarf_r5, dwarf_r5, LLDB_REGNUM_GENERIC_ARG2, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM }, NULL, NULL},
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{ "r6" , "arg3", 8, 0, eEncodingUint, eFormatHex, { dwarf_r6, dwarf_r6, LLDB_REGNUM_GENERIC_ARG3, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM }, NULL, NULL},
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{ "r7" , "arg4", 8, 0, eEncodingUint, eFormatHex, { dwarf_r7, dwarf_r7, LLDB_REGNUM_GENERIC_ARG4, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM }, NULL, NULL},
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{ "r8" , "arg5", 8, 0, eEncodingUint, eFormatHex, { dwarf_r8, dwarf_r8, LLDB_REGNUM_GENERIC_ARG5, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM }, NULL, NULL},
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{ "r9" , "arg6", 8, 0, eEncodingUint, eFormatHex, { dwarf_r9, dwarf_r9, LLDB_REGNUM_GENERIC_ARG6, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM }, NULL, NULL},
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{ "r10" , "arg7", 8, 0, eEncodingUint, eFormatHex, { dwarf_r10, dwarf_r10, LLDB_REGNUM_GENERIC_ARG7, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM }, NULL, NULL},
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{ "r11" , "arg8", 8, 0, eEncodingUint, eFormatHex, { dwarf_r11, dwarf_r11, LLDB_REGNUM_GENERIC_ARG8, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM }, NULL, NULL},
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{ "r12" , NULL, 8, 0, eEncodingUint, eFormatHex, { dwarf_r12, dwarf_r12, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM }, NULL, NULL},
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{ "r13" , NULL, 8, 0, eEncodingUint, eFormatHex, { dwarf_r13, dwarf_r13, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM }, NULL, NULL},
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{ "r14" , NULL, 8, 0, eEncodingUint, eFormatHex, { dwarf_r14, dwarf_r14, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM }, NULL, NULL},
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{ "r15" , NULL, 8, 0, eEncodingUint, eFormatHex, { dwarf_r15, dwarf_r15, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM }, NULL, NULL},
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{ "r16" , NULL, 8, 0, eEncodingUint, eFormatHex, { dwarf_r16, dwarf_r16, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM }, NULL, NULL},
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{ "r17" , NULL, 8, 0, eEncodingUint, eFormatHex, { dwarf_r17, dwarf_r17, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM }, NULL, NULL},
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{ "r18" , NULL, 8, 0, eEncodingUint, eFormatHex, { dwarf_r18, dwarf_r18, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM }, NULL, NULL},
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{ "r19" , NULL, 8, 0, eEncodingUint, eFormatHex, { dwarf_r19, dwarf_r19, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM }, NULL, NULL},
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{ "r20" , NULL, 8, 0, eEncodingUint, eFormatHex, { dwarf_r20, dwarf_r20, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM }, NULL, NULL},
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{ "r21" , NULL, 8, 0, eEncodingUint, eFormatHex, { dwarf_r21, dwarf_r21, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM }, NULL, NULL},
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{ "r22" , NULL, 8, 0, eEncodingUint, eFormatHex, { dwarf_r22, dwarf_r22, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM }, NULL, NULL},
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{ "r23" , NULL, 8, 0, eEncodingUint, eFormatHex, { dwarf_r23, dwarf_r23, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM }, NULL, NULL},
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{ "r24" , NULL, 8, 0, eEncodingUint, eFormatHex, { dwarf_r24, dwarf_r24, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM }, NULL, NULL},
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{ "r25" , NULL, 8, 0, eEncodingUint, eFormatHex, { dwarf_r25, dwarf_r25, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM }, NULL, NULL},
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{ "r26" , NULL, 8, 0, eEncodingUint, eFormatHex, { dwarf_r26, dwarf_r26, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM }, NULL, NULL},
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{ "r27" , NULL, 8, 0, eEncodingUint, eFormatHex, { dwarf_r27, dwarf_r27, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM }, NULL, NULL},
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{ "r28" , "gp", 8, 0, eEncodingUint, eFormatHex, { dwarf_r28, dwarf_r28, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM }, NULL, NULL},
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{ "r29" , "sp", 8, 0, eEncodingUint, eFormatHex, { dwarf_r29, dwarf_r29, LLDB_REGNUM_GENERIC_SP, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM }, NULL, NULL},
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{ "r30" , "fp", 8, 0, eEncodingUint, eFormatHex, { dwarf_r30, dwarf_r30, LLDB_REGNUM_GENERIC_FP, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM }, NULL, NULL},
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{ "r31" , "ra", 8, 0, eEncodingUint, eFormatHex, { dwarf_r31, dwarf_r31, LLDB_REGNUM_GENERIC_RA, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM }, NULL, NULL},
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{ "sr" , NULL, 4, 0, eEncodingUint, eFormatHex, { dwarf_sr, dwarf_sr, LLDB_REGNUM_GENERIC_FLAGS, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM }, NULL, NULL},
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{ "lo" , NULL, 8, 0, eEncodingUint, eFormatHex, { dwarf_lo, dwarf_lo, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM }, NULL, NULL},
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{ "hi" , NULL, 8, 0, eEncodingUint, eFormatHex, { dwarf_hi, dwarf_hi, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM }, NULL, NULL},
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{ "bad" , NULL, 8, 0, eEncodingUint, eFormatHex, { dwarf_bad, dwarf_bad, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM }, NULL, NULL},
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{ "cause" , NULL, 8, 0, eEncodingUint, eFormatHex, { dwarf_cause, dwarf_cause, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM }, NULL, NULL},
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{ "pc" , NULL, 8, 0, eEncodingUint, eFormatHex, { dwarf_pc, dwarf_pc, LLDB_REGNUM_GENERIC_PC, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM }, NULL, NULL},
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};
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static const uint32_t k_num_register_infos = llvm::array_lengthof(g_register_infos_mips64);
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const lldb_private::RegisterInfo *
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ABISysV_mips64::GetRegisterInfoArray (uint32_t &count)
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{
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count = k_num_register_infos;
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return g_register_infos_mips64;
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}
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size_t
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ABISysV_mips64::GetRedZoneSize () const
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{
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return 0;
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}
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//------------------------------------------------------------------
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// Static Functions
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//------------------------------------------------------------------
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ABISP
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ABISysV_mips64::CreateInstance (const ArchSpec &arch)
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{
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static ABISP g_abi_sp;
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const llvm::Triple::ArchType arch_type = arch.GetTriple().getArch();
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if ((arch_type == llvm::Triple::mips64) ||
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(arch_type == llvm::Triple::mips64el))
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{
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if (!g_abi_sp)
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g_abi_sp.reset (new ABISysV_mips64);
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return g_abi_sp;
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}
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return ABISP();
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}
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bool
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ABISysV_mips64::PrepareTrivialCall (Thread &thread,
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addr_t sp,
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addr_t func_addr,
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addr_t return_addr,
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llvm::ArrayRef<addr_t> args) const
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{
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Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_EXPRESSIONS));
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if (log)
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{
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StreamString s;
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s.Printf("ABISysV_mips64::PrepareTrivialCall (tid = 0x%" PRIx64 ", sp = 0x%" PRIx64 ", func_addr = 0x%" PRIx64 ", return_addr = 0x%" PRIx64,
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thread.GetID(),
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(uint64_t)sp,
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(uint64_t)func_addr,
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(uint64_t)return_addr);
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for (size_t i = 0; i < args.size(); ++i)
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s.Printf (", arg%zd = 0x%" PRIx64, i + 1, args[i]);
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s.PutCString (")");
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log->PutCString(s.GetString().c_str());
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}
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RegisterContext *reg_ctx = thread.GetRegisterContext().get();
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if (!reg_ctx)
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return false;
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const RegisterInfo *reg_info = NULL;
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if (args.size() > 8) // TODO handle more than 8 arguments
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return false;
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for (size_t i = 0; i < args.size(); ++i)
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{
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reg_info = reg_ctx->GetRegisterInfo(eRegisterKindGeneric, LLDB_REGNUM_GENERIC_ARG1 + i);
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if (log)
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log->Printf("About to write arg%zd (0x%" PRIx64 ") into %s", i + 1, args[i], reg_info->name);
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if (!reg_ctx->WriteRegisterFromUnsigned(reg_info, args[i]))
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return false;
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}
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// First, align the SP
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if (log)
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log->Printf("16-byte aligning SP: 0x%" PRIx64 " to 0x%" PRIx64, (uint64_t)sp, (uint64_t)(sp & ~0xfull));
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sp &= ~(0xfull); // 16-byte alignment
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Error error;
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const RegisterInfo *pc_reg_info = reg_ctx->GetRegisterInfo (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_PC);
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const RegisterInfo *sp_reg_info = reg_ctx->GetRegisterInfo (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_SP);
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const RegisterInfo *ra_reg_info = reg_ctx->GetRegisterInfo (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_RA);
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if (log)
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log->Printf("Writing SP: 0x%" PRIx64, (uint64_t)sp);
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// Set "sp" to the requested value
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if (!reg_ctx->WriteRegisterFromUnsigned (sp_reg_info, sp))
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return false;
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if (log)
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log->Printf("Writing RA: 0x%" PRIx64, (uint64_t)return_addr);
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// Set "ra" to the return address
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if (!reg_ctx->WriteRegisterFromUnsigned (ra_reg_info, return_addr))
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return false;
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if (log)
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log->Printf("Writing PC: 0x%" PRIx64, (uint64_t)func_addr);
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// Set pc to the address of the called function.
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if (!reg_ctx->WriteRegisterFromUnsigned (pc_reg_info, func_addr))
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return false;
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return true;
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}
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bool
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ABISysV_mips64::GetArgumentValues (Thread &thread, ValueList &values) const
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{
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return false;
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}
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Error
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ABISysV_mips64::SetReturnValueObject(lldb::StackFrameSP &frame_sp, lldb::ValueObjectSP &new_value_sp)
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{
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Error error;
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if (!new_value_sp)
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{
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error.SetErrorString("Empty value object for return value.");
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return error;
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}
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CompilerType compiler_type = new_value_sp->GetCompilerType();
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if (!compiler_type)
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{
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error.SetErrorString ("Null clang type for return value.");
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return error;
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}
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Thread *thread = frame_sp->GetThread().get();
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RegisterContext *reg_ctx = thread->GetRegisterContext().get();
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if (!reg_ctx)
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error.SetErrorString("no registers are available");
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DataExtractor data;
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Error data_error;
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size_t num_bytes = new_value_sp->GetData(data, data_error);
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if (data_error.Fail())
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{
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error.SetErrorStringWithFormat("Couldn't convert return value to raw data: %s", data_error.AsCString());
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return error;
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}
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const uint32_t type_flags = compiler_type.GetTypeInfo (NULL);
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if (type_flags & eTypeIsScalar ||
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type_flags & eTypeIsPointer)
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{
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if (type_flags & eTypeIsInteger ||
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type_flags & eTypeIsPointer )
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{
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lldb::offset_t offset = 0;
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if (num_bytes <= 16)
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{
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const RegisterInfo *r2_info = reg_ctx->GetRegisterInfoByName("r2", 0);
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if (num_bytes <= 8)
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{
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uint64_t raw_value = data.GetMaxU64(&offset, num_bytes);
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if (!reg_ctx->WriteRegisterFromUnsigned (r2_info, raw_value))
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error.SetErrorString ("failed to write register r2");
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}
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else
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{
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uint64_t raw_value = data.GetMaxU64(&offset, 8);
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if (reg_ctx->WriteRegisterFromUnsigned (r2_info, raw_value))
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{
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const RegisterInfo *r3_info = reg_ctx->GetRegisterInfoByName("r3", 0);
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raw_value = data.GetMaxU64(&offset, num_bytes - offset);
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if (!reg_ctx->WriteRegisterFromUnsigned (r3_info, raw_value))
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error.SetErrorString ("failed to write register r3");
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}
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else
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error.SetErrorString ("failed to write register r2");
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}
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}
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else
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{
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error.SetErrorString("We don't support returning longer than 128 bit integer values at present.");
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}
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}
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else if (type_flags & eTypeIsFloat)
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{
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error.SetErrorString("TODO: Handle Float Types.");
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}
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}
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else if (type_flags & eTypeIsVector)
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{
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error.SetErrorString("returning vector values are not supported");
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}
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return error;
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}
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ValueObjectSP
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ABISysV_mips64::GetReturnValueObjectSimple (Thread &thread, CompilerType &return_compiler_type) const
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{
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ValueObjectSP return_valobj_sp;
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return return_valobj_sp;
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}
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ValueObjectSP
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ABISysV_mips64::GetReturnValueObjectImpl (Thread &thread, CompilerType &return_compiler_type) const
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{
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ValueObjectSP return_valobj_sp;
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Value value;
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Error error;
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ExecutionContext exe_ctx (thread.shared_from_this());
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if (exe_ctx.GetTargetPtr() == NULL || exe_ctx.GetProcessPtr() == NULL)
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return return_valobj_sp;
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value.SetCompilerType(return_compiler_type);
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RegisterContext *reg_ctx = thread.GetRegisterContext().get();
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if (!reg_ctx)
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return return_valobj_sp;
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Target *target = exe_ctx.GetTargetPtr();
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ByteOrder target_byte_order = target->GetArchitecture().GetByteOrder();
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const size_t byte_size = return_compiler_type.GetByteSize(nullptr);
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const uint32_t type_flags = return_compiler_type.GetTypeInfo (NULL);
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const RegisterInfo *r2_info = reg_ctx->GetRegisterInfoByName("r2", 0);
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const RegisterInfo *r3_info = reg_ctx->GetRegisterInfoByName("r3", 0);
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if (type_flags & eTypeIsScalar ||
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type_flags & eTypeIsPointer)
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{
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value.SetValueType(Value::eValueTypeScalar);
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bool success = false;
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if (type_flags & eTypeIsInteger ||
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type_flags & eTypeIsPointer)
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{
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// Extract the register context so we can read arguments from registers
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// In MIPS register "r2" (v0) holds the integer function return values
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uint64_t raw_value = reg_ctx->ReadRegisterAsUnsigned(r2_info, 0);
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const bool is_signed = (type_flags & eTypeIsSigned) != 0;
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switch (byte_size)
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{
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default:
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break;
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case sizeof(uint64_t):
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if (is_signed)
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value.GetScalar() = (int64_t)(raw_value);
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else
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value.GetScalar() = (uint64_t)(raw_value);
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success = true;
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break;
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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 (byte_size <= sizeof(long double))
|
|
{
|
|
const RegisterInfo *f0_info = reg_ctx->GetRegisterInfoByName("f0", 0);
|
|
const RegisterInfo *f2_info = reg_ctx->GetRegisterInfoByName("f2", 0);
|
|
RegisterValue f0_value, f2_value;
|
|
DataExtractor f0_data, f2_data;
|
|
|
|
reg_ctx->ReadRegister (f0_info, f0_value);
|
|
reg_ctx->ReadRegister (f2_info, f2_value);
|
|
|
|
f0_value.GetData(f0_data);
|
|
f2_value.GetData(f2_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))
|
|
{
|
|
DataExtractor *copy_from_extractor = NULL;
|
|
DataBufferSP data_sp (new DataBufferHeap(16, 0));
|
|
DataExtractor return_ext (data_sp,
|
|
target_byte_order,
|
|
target->GetArchitecture().GetAddressByteSize());
|
|
|
|
if (target_byte_order == eByteOrderLittle)
|
|
{
|
|
f0_data.Append(f2_data);
|
|
copy_from_extractor = &f0_data;
|
|
}
|
|
else
|
|
{
|
|
f2_data.Append(f0_data);
|
|
copy_from_extractor = &f2_data;
|
|
}
|
|
|
|
copy_from_extractor->CopyByteOrderedData (0,
|
|
byte_size,
|
|
data_sp->GetBytes(),
|
|
byte_size,
|
|
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;
|
|
|
|
uint32_t integer_bytes = 0; // Tracks how much bytes of r2 and r3 registers we've consumed so far
|
|
bool use_fp_regs = 0; // True if return values are in FP return registers.
|
|
bool found_non_fp_field = 0; // True if we found any non floating point field in structure.
|
|
bool use_r2 = 0; // True if return values are in r2 register.
|
|
bool use_r3 = 0; // True if return values are in r3 register.
|
|
bool sucess = 0; // True if the result is copied into our data buffer
|
|
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, NULL, NULL);
|
|
|
|
if (field_compiler_type.IsFloatingPointType (count, is_complex))
|
|
use_fp_regs = 1;
|
|
else
|
|
found_non_fp_field = 1;
|
|
}
|
|
|
|
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);
|
|
f2_value.GetData(f2_data);
|
|
|
|
for (uint32_t idx = 0; idx < num_children; idx++)
|
|
{
|
|
CompilerType field_compiler_type = return_compiler_type.GetFieldAtIndex (idx, name, &field_bit_offset, NULL, NULL);
|
|
const size_t field_byte_width = field_compiler_type.GetByteSize(nullptr);
|
|
|
|
DataExtractor *copy_from_extractor = NULL;
|
|
|
|
if (idx == 0)
|
|
{
|
|
if (field_byte_width == 16) // This case is for long double type.
|
|
{
|
|
// If structure contains long double type, then it is returned in fp0/fp1 registers.
|
|
reg_ctx->ReadRegister (f1_info, f1_value);
|
|
f1_value.GetData(f1_data);
|
|
|
|
if (target_byte_order == eByteOrderLittle)
|
|
{
|
|
f0_data.Append(f1_data);
|
|
copy_from_extractor = &f0_data;
|
|
}
|
|
else
|
|
{
|
|
f1_data.Append(f0_data);
|
|
copy_from_extractor = &f1_data;
|
|
}
|
|
}
|
|
else
|
|
copy_from_extractor = &f0_data; // This is in f0, copy from register to our result structure
|
|
}
|
|
else
|
|
copy_from_extractor = &f2_data; // This is in f2, copy from register to our result structure
|
|
|
|
// 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, NULL, NULL);
|
|
const size_t field_byte_width = field_compiler_type.GetByteSize(nullptr);
|
|
|
|
// if we don't know the size of the field (e.g. invalid type), just bail out
|
|
if (field_byte_width == 0)
|
|
break;
|
|
|
|
uint32_t field_byte_offset = field_bit_offset/8;
|
|
|
|
if (field_compiler_type.IsIntegerType (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 = 1;
|
|
}
|
|
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 = 1;
|
|
}
|
|
}
|
|
// 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 = 1;
|
|
}
|
|
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 NULL return value object.
|
|
return return_valobj_sp;
|
|
}
|
|
}
|
|
}
|
|
// Vector types upto 16 bytes are returned in GP return registers
|
|
if (type_flags & eTypeIsVector)
|
|
{
|
|
if (byte_size <= 8)
|
|
use_r2 = 1;
|
|
else
|
|
{
|
|
use_r2 = 1;
|
|
use_r3 = 1;
|
|
}
|
|
}
|
|
|
|
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 = 1;
|
|
}
|
|
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 = 1;
|
|
}
|
|
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, NULL),
|
|
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);
|
|
return true;
|
|
}
|
|
|
|
bool
|
|
ABISysV_mips64::RegisterIsVolatile (const RegisterInfo *reg_info)
|
|
{
|
|
return !RegisterIsCalleeSaved (reg_info);
|
|
}
|
|
|
|
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;
|
|
}
|