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llvm/llvm-project/f3d4f2aa601703166e75ec00a67624b073a613f2/./lldb/source/Plugins/Process/FreeBSD/NativeRegisterContextFreeBSD_x86.cpp
blob: 3359c59f88d8e291ae5a4bcb97abe38eb6af2991 [file]
//===-- NativeRegisterContextFreeBSD_x86.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
//
//===----------------------------------------------------------------------===//
#if defined(__i386__) || defined(__x86_64__)
#include "NativeRegisterContextFreeBSD_x86.h"
// clang-format off
#include <x86/fpu.h>
#include <x86/specialreg.h>
#include <cpuid.h>
// clang-format on
#include "lldb/Host/HostInfo.h"
#include "lldb/Utility/DataBufferHeap.h"
#include "lldb/Utility/Log.h"
#include "lldb/Utility/RegisterValue.h"
#include "lldb/Utility/Status.h"
#include "NativeProcessFreeBSD.h"
#include "Register/FreeBSD/RegisterInfoFreeBSD_i386.h"
#include "Register/FreeBSD/RegisterInfoFreeBSD_x86_64.h"
#include <optional>
using namespace lldb_private;
using namespace lldb_private::process_freebsd;
// x86 64-bit general purpose registers.
static const uint32_t g_gpr_regnums_x86_64[] = {
lldb_rax_x86_64, lldb_rbx_x86_64, lldb_rcx_x86_64, lldb_rdx_x86_64,
lldb_rdi_x86_64, lldb_rsi_x86_64, lldb_rbp_x86_64, lldb_rsp_x86_64,
lldb_r8_x86_64, lldb_r9_x86_64, lldb_r10_x86_64, lldb_r11_x86_64,
lldb_r12_x86_64, lldb_r13_x86_64, lldb_r14_x86_64, lldb_r15_x86_64,
lldb_rip_x86_64, lldb_rflags_x86_64, lldb_cs_x86_64, lldb_fs_x86_64,
lldb_gs_x86_64, lldb_ss_x86_64, lldb_ds_x86_64, lldb_es_x86_64,
lldb_eax_x86_64, lldb_ebx_x86_64, lldb_ecx_x86_64, lldb_edx_x86_64,
lldb_edi_x86_64, lldb_esi_x86_64, lldb_ebp_x86_64, lldb_esp_x86_64,
lldb_r8d_x86_64, // Low 32 bits or r8
lldb_r9d_x86_64, // Low 32 bits or r9
lldb_r10d_x86_64, // Low 32 bits or r10
lldb_r11d_x86_64, // Low 32 bits or r11
lldb_r12d_x86_64, // Low 32 bits or r12
lldb_r13d_x86_64, // Low 32 bits or r13
lldb_r14d_x86_64, // Low 32 bits or r14
lldb_r15d_x86_64, // Low 32 bits or r15
lldb_ax_x86_64, lldb_bx_x86_64, lldb_cx_x86_64, lldb_dx_x86_64,
lldb_di_x86_64, lldb_si_x86_64, lldb_bp_x86_64, lldb_sp_x86_64,
lldb_r8w_x86_64, // Low 16 bits or r8
lldb_r9w_x86_64, // Low 16 bits or r9
lldb_r10w_x86_64, // Low 16 bits or r10
lldb_r11w_x86_64, // Low 16 bits or r11
lldb_r12w_x86_64, // Low 16 bits or r12
lldb_r13w_x86_64, // Low 16 bits or r13
lldb_r14w_x86_64, // Low 16 bits or r14
lldb_r15w_x86_64, // Low 16 bits or r15
lldb_ah_x86_64, lldb_bh_x86_64, lldb_ch_x86_64, lldb_dh_x86_64,
lldb_al_x86_64, lldb_bl_x86_64, lldb_cl_x86_64, lldb_dl_x86_64,
lldb_dil_x86_64, lldb_sil_x86_64, lldb_bpl_x86_64, lldb_spl_x86_64,
lldb_r8l_x86_64, // Low 8 bits or r8
lldb_r9l_x86_64, // Low 8 bits or r9
lldb_r10l_x86_64, // Low 8 bits or r10
lldb_r11l_x86_64, // Low 8 bits or r11
lldb_r12l_x86_64, // Low 8 bits or r12
lldb_r13l_x86_64, // Low 8 bits or r13
lldb_r14l_x86_64, // Low 8 bits or r14
lldb_r15l_x86_64, // Low 8 bits or r15
LLDB_INVALID_REGNUM // register sets need to end with this flag
};
static_assert((sizeof(g_gpr_regnums_x86_64) / sizeof(g_gpr_regnums_x86_64[0])) -
1 ==
k_num_gpr_registers_x86_64,
"g_gpr_regnums_x86_64 has wrong number of register infos");
// x86 64-bit floating point registers.
static const uint32_t g_fpu_regnums_x86_64[] = {
lldb_fctrl_x86_64, lldb_fstat_x86_64, lldb_ftag_x86_64,
lldb_fop_x86_64, lldb_fiseg_x86_64, lldb_fioff_x86_64,
lldb_fip_x86_64, lldb_foseg_x86_64, lldb_fooff_x86_64,
lldb_fdp_x86_64, lldb_mxcsr_x86_64, lldb_mxcsrmask_x86_64,
lldb_st0_x86_64, lldb_st1_x86_64, lldb_st2_x86_64,
lldb_st3_x86_64, lldb_st4_x86_64, lldb_st5_x86_64,
lldb_st6_x86_64, lldb_st7_x86_64, lldb_mm0_x86_64,
lldb_mm1_x86_64, lldb_mm2_x86_64, lldb_mm3_x86_64,
lldb_mm4_x86_64, lldb_mm5_x86_64, lldb_mm6_x86_64,
lldb_mm7_x86_64, lldb_xmm0_x86_64, lldb_xmm1_x86_64,
lldb_xmm2_x86_64, lldb_xmm3_x86_64, lldb_xmm4_x86_64,
lldb_xmm5_x86_64, lldb_xmm6_x86_64, lldb_xmm7_x86_64,
lldb_xmm8_x86_64, lldb_xmm9_x86_64, lldb_xmm10_x86_64,
lldb_xmm11_x86_64, lldb_xmm12_x86_64, lldb_xmm13_x86_64,
lldb_xmm14_x86_64, lldb_xmm15_x86_64,
LLDB_INVALID_REGNUM // register sets need to end with this flag
};
static_assert((sizeof(g_fpu_regnums_x86_64) / sizeof(g_fpu_regnums_x86_64[0])) -
1 ==
k_num_fpr_registers_x86_64,
"g_fpu_regnums_x86_64 has wrong number of register infos");
static const uint32_t g_avx_regnums_x86_64[] = {
lldb_ymm0_x86_64, lldb_ymm1_x86_64, lldb_ymm2_x86_64, lldb_ymm3_x86_64,
lldb_ymm4_x86_64, lldb_ymm5_x86_64, lldb_ymm6_x86_64, lldb_ymm7_x86_64,
lldb_ymm8_x86_64, lldb_ymm9_x86_64, lldb_ymm10_x86_64, lldb_ymm11_x86_64,
lldb_ymm12_x86_64, lldb_ymm13_x86_64, lldb_ymm14_x86_64, lldb_ymm15_x86_64,
LLDB_INVALID_REGNUM // register sets need to end with this flag
};
static_assert((sizeof(g_avx_regnums_x86_64) / sizeof(g_avx_regnums_x86_64[0])) -
1 ==
k_num_avx_registers_x86_64,
"g_avx_regnums_x86_64 has wrong number of register infos");
static const uint32_t g_mpx_regnums_x86_64[] = {
// Note: we currently do not provide them but this is needed to avoid
// unnamed groups in SBFrame::GetRegisterContext().
lldb_bnd0_x86_64, lldb_bnd1_x86_64, lldb_bnd2_x86_64,
lldb_bnd3_x86_64, lldb_bndcfgu_x86_64, lldb_bndstatus_x86_64,
LLDB_INVALID_REGNUM // register sets need to end with this flag
};
static_assert((sizeof(g_mpx_regnums_x86_64) / sizeof(g_mpx_regnums_x86_64[0])) -
1 ==
k_num_mpx_registers_x86_64,
"g_mpx_regnums_x86_64 has wrong number of register infos");
// x86 debug registers.
static const uint32_t g_dbr_regnums_x86_64[] = {
lldb_dr0_x86_64, lldb_dr1_x86_64, lldb_dr2_x86_64, lldb_dr3_x86_64,
lldb_dr4_x86_64, lldb_dr5_x86_64, lldb_dr6_x86_64, lldb_dr7_x86_64,
LLDB_INVALID_REGNUM // register sets need to end with this flag
};
static_assert((sizeof(g_dbr_regnums_x86_64) / sizeof(g_dbr_regnums_x86_64[0])) -
1 ==
k_num_dbr_registers_x86_64,
"g_dbr_regnums_x86_64 has wrong number of register infos");
// x86 32-bit general purpose registers.
static const uint32_t g_gpr_regnums_i386[] = {
lldb_eax_i386, lldb_ebx_i386, lldb_ecx_i386, lldb_edx_i386,
lldb_edi_i386, lldb_esi_i386, lldb_ebp_i386, lldb_esp_i386,
lldb_eip_i386, lldb_eflags_i386, lldb_cs_i386, lldb_fs_i386,
lldb_gs_i386, lldb_ss_i386, lldb_ds_i386, lldb_es_i386,
lldb_ax_i386, lldb_bx_i386, lldb_cx_i386, lldb_dx_i386,
lldb_di_i386, lldb_si_i386, lldb_bp_i386, lldb_sp_i386,
lldb_ah_i386, lldb_bh_i386, lldb_ch_i386, lldb_dh_i386,
lldb_al_i386, lldb_bl_i386, lldb_cl_i386, lldb_dl_i386,
LLDB_INVALID_REGNUM // register sets need to end with this flag
};
static_assert((sizeof(g_gpr_regnums_i386) / sizeof(g_gpr_regnums_i386[0])) -
1 ==
k_num_gpr_registers_i386,
"g_gpr_regnums_i386 has wrong number of register infos");
// x86 32-bit floating point registers.
static const uint32_t g_fpu_regnums_i386[] = {
lldb_fctrl_i386, lldb_fstat_i386, lldb_ftag_i386, lldb_fop_i386,
lldb_fiseg_i386, lldb_fioff_i386, lldb_foseg_i386, lldb_fooff_i386,
lldb_mxcsr_i386, lldb_mxcsrmask_i386, lldb_st0_i386, lldb_st1_i386,
lldb_st2_i386, lldb_st3_i386, lldb_st4_i386, lldb_st5_i386,
lldb_st6_i386, lldb_st7_i386, lldb_mm0_i386, lldb_mm1_i386,
lldb_mm2_i386, lldb_mm3_i386, lldb_mm4_i386, lldb_mm5_i386,
lldb_mm6_i386, lldb_mm7_i386, lldb_xmm0_i386, lldb_xmm1_i386,
lldb_xmm2_i386, lldb_xmm3_i386, lldb_xmm4_i386, lldb_xmm5_i386,
lldb_xmm6_i386, lldb_xmm7_i386,
LLDB_INVALID_REGNUM // register sets need to end with this flag
};
static_assert((sizeof(g_fpu_regnums_i386) / sizeof(g_fpu_regnums_i386[0])) -
1 ==
k_num_fpr_registers_i386,
"g_fpu_regnums_i386 has wrong number of register infos");
static const uint32_t g_avx_regnums_i386[] = {
lldb_ymm0_i386, lldb_ymm1_i386, lldb_ymm2_i386, lldb_ymm3_i386,
lldb_ymm4_i386, lldb_ymm5_i386, lldb_ymm6_i386, lldb_ymm7_i386,
LLDB_INVALID_REGNUM // register sets need to end with this flag
};
static_assert((sizeof(g_avx_regnums_i386) / sizeof(g_avx_regnums_i386[0])) -
1 ==
k_num_avx_registers_i386,
"g_avx_regnums_i386 has wrong number of register infos");
static const uint32_t g_mpx_regnums_i386[] = {
// Note: we currently do not provide them but this is needed to avoid
// unnamed groups in SBFrame::GetRegisterContext().
lldb_bnd0_i386, lldb_bnd1_i386, lldb_bnd2_i386,
lldb_bnd3_i386, lldb_bndcfgu_i386, lldb_bndstatus_i386,
LLDB_INVALID_REGNUM // register sets need to end with this flag
};
static_assert((sizeof(g_mpx_regnums_i386) / sizeof(g_mpx_regnums_i386[0])) -
1 ==
k_num_mpx_registers_i386,
"g_mpx_regnums_i386 has wrong number of register infos");
// x86 debug registers.
static const uint32_t g_dbr_regnums_i386[] = {
lldb_dr0_i386, lldb_dr1_i386, lldb_dr2_i386, lldb_dr3_i386,
lldb_dr4_i386, lldb_dr5_i386, lldb_dr6_i386, lldb_dr7_i386,
LLDB_INVALID_REGNUM // register sets need to end with this flag
};
static_assert((sizeof(g_dbr_regnums_i386) / sizeof(g_dbr_regnums_i386[0])) -
1 ==
k_num_dbr_registers_i386,
"g_dbr_regnums_i386 has wrong number of register infos");
// Number of register sets provided by this context.
enum { k_num_register_sets = 5 };
// Register sets for x86 32-bit.
static const RegisterSet g_reg_sets_i386[k_num_register_sets] = {
{"General Purpose Registers", "gpr", k_num_gpr_registers_i386,
g_gpr_regnums_i386},
{"Floating Point Registers", "fpu", k_num_fpr_registers_i386,
g_fpu_regnums_i386},
{"Debug Registers", "dbr", k_num_dbr_registers_i386, g_dbr_regnums_i386},
{"Advanced Vector Extensions", "avx", k_num_avx_registers_i386,
g_avx_regnums_i386},
{"Memory Protection Extensions", "mpx", k_num_mpx_registers_i386,
g_mpx_regnums_i386},
};
// Register sets for x86 64-bit.
static const RegisterSet g_reg_sets_x86_64[k_num_register_sets] = {
{"General Purpose Registers", "gpr", k_num_gpr_registers_x86_64,
g_gpr_regnums_x86_64},
{"Floating Point Registers", "fpu", k_num_fpr_registers_x86_64,
g_fpu_regnums_x86_64},
{"Debug Registers", "dbr", k_num_dbr_registers_x86_64,
g_dbr_regnums_x86_64},
{"Advanced Vector Extensions", "avx", k_num_avx_registers_x86_64,
g_avx_regnums_x86_64},
{"Memory Protection Extensions", "mpx", k_num_mpx_registers_x86_64,
g_mpx_regnums_x86_64},
};
#define REG_CONTEXT_SIZE (GetRegisterInfoInterface().GetGPRSize())
NativeRegisterContextFreeBSD *
NativeRegisterContextFreeBSD::CreateHostNativeRegisterContextFreeBSD(
const ArchSpec &target_arch, NativeThreadFreeBSD &native_thread) {
return new NativeRegisterContextFreeBSD_x86(target_arch, native_thread);
}
// NativeRegisterContextFreeBSD_x86 members.
static RegisterInfoInterface *
CreateRegisterInfoInterface(const ArchSpec &target_arch) {
if (HostInfo::GetArchitecture().GetAddressByteSize() == 4) {
// 32-bit hosts run with a RegisterInfoFreeBSD_i386 context.
return new RegisterInfoFreeBSD_i386(target_arch);
} else {
assert((HostInfo::GetArchitecture().GetAddressByteSize() == 8) &&
"Register setting path assumes this is a 64-bit host");
// X86_64 hosts know how to work with 64-bit and 32-bit EXEs using the
// x86_64 register context.
return new RegisterInfoFreeBSD_x86_64(target_arch);
}
}
NativeRegisterContextFreeBSD_x86::NativeRegisterContextFreeBSD_x86(
const ArchSpec &target_arch, NativeThreadFreeBSD &native_thread)
: NativeRegisterContextRegisterInfo(
native_thread, CreateRegisterInfoInterface(target_arch)),
m_regset_offsets({0}) {
assert(m_gpr.size() == GetRegisterInfoInterface().GetGPRSize());
std::array<uint32_t, MaxRegSet + 1> first_regnos;
switch (GetRegisterInfoInterface().GetTargetArchitecture().GetMachine()) {
case llvm::Triple::x86:
first_regnos[FPRegSet] = lldb_fctrl_i386;
first_regnos[DBRegSet] = lldb_dr0_i386;
break;
case llvm::Triple::x86_64:
first_regnos[FPRegSet] = lldb_fctrl_x86_64;
first_regnos[DBRegSet] = lldb_dr0_x86_64;
break;
default:
llvm_unreachable("Unhandled target architecture.");
}
for (int i : {FPRegSet, DBRegSet})
m_regset_offsets[i] = GetRegisterInfoInterface()
.GetRegisterInfo()[first_regnos[i]]
.byte_offset;
}
uint32_t NativeRegisterContextFreeBSD_x86::GetRegisterSetCount() const {
return k_num_register_sets;
}
const RegisterSet *
NativeRegisterContextFreeBSD_x86::GetRegisterSet(uint32_t set_index) const {
switch (GetRegisterInfoInterface().GetTargetArchitecture().GetMachine()) {
case llvm::Triple::x86:
return &g_reg_sets_i386[set_index];
case llvm::Triple::x86_64:
return &g_reg_sets_x86_64[set_index];
default:
llvm_unreachable("Unhandled target architecture.");
}
}
std::optional<NativeRegisterContextFreeBSD_x86::RegSetKind>
NativeRegisterContextFreeBSD_x86::GetSetForNativeRegNum(
uint32_t reg_num) const {
switch (GetRegisterInfoInterface().GetTargetArchitecture().GetMachine()) {
case llvm::Triple::x86:
if (reg_num >= k_first_gpr_i386 && reg_num <= k_last_gpr_i386)
return GPRegSet;
if (reg_num >= k_first_fpr_i386 && reg_num <= k_last_fpr_i386)
return FPRegSet;
if (reg_num >= k_first_avx_i386 && reg_num <= k_last_avx_i386)
return YMMRegSet;
if (reg_num >= k_first_mpxr_i386 && reg_num <= k_last_mpxr_i386)
return std::nullopt; // MPXR
if (reg_num >= k_first_mpxc_i386 && reg_num <= k_last_mpxc_i386)
return std::nullopt; // MPXC
if (reg_num >= k_first_dbr_i386 && reg_num <= k_last_dbr_i386)
return DBRegSet; // DBR
break;
case llvm::Triple::x86_64:
if (reg_num >= k_first_gpr_x86_64 && reg_num <= k_last_gpr_x86_64)
return GPRegSet;
if (reg_num >= k_first_fpr_x86_64 && reg_num <= k_last_fpr_x86_64)
return FPRegSet;
if (reg_num >= k_first_avx_x86_64 && reg_num <= k_last_avx_x86_64)
return YMMRegSet;
if (reg_num >= k_first_mpxr_x86_64 && reg_num <= k_last_mpxr_x86_64)
return std::nullopt; // MPXR
if (reg_num >= k_first_mpxc_x86_64 && reg_num <= k_last_mpxc_x86_64)
return std::nullopt; // MPXC
if (reg_num >= k_first_dbr_x86_64 && reg_num <= k_last_dbr_x86_64)
return DBRegSet; // DBR
break;
default:
llvm_unreachable("Unhandled target architecture.");
}
llvm_unreachable("Register does not belong to any register set");
}
Status NativeRegisterContextFreeBSD_x86::ReadRegisterSet(RegSetKind set) {
switch (set) {
case GPRegSet:
return NativeProcessFreeBSD::PtraceWrapper(PT_GETREGS, m_thread.GetID(),
m_gpr.data());
case FPRegSet:
#if defined(__x86_64__)
return NativeProcessFreeBSD::PtraceWrapper(PT_GETFPREGS, m_thread.GetID(),
m_fpr.data());
#else
return NativeProcessFreeBSD::PtraceWrapper(PT_GETXMMREGS, m_thread.GetID(),
m_fpr.data());
#endif
case DBRegSet:
return NativeProcessFreeBSD::PtraceWrapper(PT_GETDBREGS, m_thread.GetID(),
m_dbr.data());
case YMMRegSet:
case MPXRegSet: {
struct ptrace_xstate_info info;
Status ret = NativeProcessFreeBSD::PtraceWrapper(
PT_GETXSTATE_INFO, GetProcessPid(), &info, sizeof(info));
if (!ret.Success())
return ret;
assert(info.xsave_mask & XFEATURE_ENABLED_X87);
assert(info.xsave_mask & XFEATURE_ENABLED_SSE);
m_xsave_offsets[YMMRegSet] = LLDB_INVALID_XSAVE_OFFSET;
if (info.xsave_mask & XFEATURE_ENABLED_YMM_HI128) {
uint32_t eax, ecx, edx;
__get_cpuid_count(0x0D, 2, &eax, &m_xsave_offsets[YMMRegSet], &ecx, &edx);
}
m_xsave.resize(info.xsave_len);
return NativeProcessFreeBSD::PtraceWrapper(PT_GETXSTATE, GetProcessPid(),
m_xsave.data(), m_xsave.size());
}
}
llvm_unreachable("NativeRegisterContextFreeBSD_x86::ReadRegisterSet");
}
Status NativeRegisterContextFreeBSD_x86::WriteRegisterSet(RegSetKind set) {
switch (set) {
case GPRegSet:
return NativeProcessFreeBSD::PtraceWrapper(PT_SETREGS, m_thread.GetID(),
m_gpr.data());
case FPRegSet:
#if defined(__x86_64__)
return NativeProcessFreeBSD::PtraceWrapper(PT_SETFPREGS, m_thread.GetID(),
m_fpr.data());
#else
return NativeProcessFreeBSD::PtraceWrapper(PT_SETXMMREGS, m_thread.GetID(),
m_fpr.data());
#endif
case DBRegSet:
return NativeProcessFreeBSD::PtraceWrapper(PT_SETDBREGS, m_thread.GetID(),
m_dbr.data());
case YMMRegSet:
case MPXRegSet:
// ReadRegisterSet() must always be called before WriteRegisterSet().
assert(m_xsave.size() > 0);
return NativeProcessFreeBSD::PtraceWrapper(PT_SETXSTATE, GetProcessPid(),
m_xsave.data(), m_xsave.size());
}
llvm_unreachable("NativeRegisterContextFreeBSD_x86::WriteRegisterSet");
}
Status
NativeRegisterContextFreeBSD_x86::ReadRegister(const RegisterInfo *reg_info,
RegisterValue &reg_value) {
Status error;
if (!reg_info) {
error = Status::FromErrorString("reg_info NULL");
return error;
}
uint32_t reg = reg_info->kinds[lldb::eRegisterKindLLDB];
if (reg == LLDB_INVALID_REGNUM) {
// This is likely an internal register for lldb use only and should not be
// directly queried.
error = Status::FromErrorStringWithFormat(
"register \"%s\" is an internal-only lldb "
"register, cannot read directly",
reg_info->name);
return error;
}
std::optional<RegSetKind> opt_set = GetSetForNativeRegNum(reg);
if (!opt_set) {
// This is likely an internal register for lldb use only and should not be
// directly queried.
error = Status::FromErrorStringWithFormat(
"register \"%s\" is in unrecognized set", reg_info->name);
return error;
}
RegSetKind set = opt_set.value();
error = ReadRegisterSet(set);
if (error.Fail())
return error;
switch (set) {
case GPRegSet:
case FPRegSet:
case DBRegSet: {
void *data = GetOffsetRegSetData(set, reg_info->byte_offset);
FXSAVE *fpr = reinterpret_cast<FXSAVE *>(m_fpr.data());
if (data == &fpr->ftag) // ftag
reg_value.SetUInt16(
AbridgedToFullTagWord(fpr->ftag, fpr->fstat, fpr->stmm));
else
reg_value.SetBytes(data, reg_info->byte_size, endian::InlHostByteOrder());
break;
}
case YMMRegSet: {
std::optional<YMMSplitPtr> ymm_reg = GetYMMSplitReg(reg);
if (!ymm_reg) {
error = Status::FromErrorStringWithFormat(
"register \"%s\" not supported by CPU/kernel", reg_info->name);
} else {
YMMReg ymm = XStateToYMM(ymm_reg->xmm, ymm_reg->ymm_hi);
reg_value.SetBytes(ymm.bytes, reg_info->byte_size,
endian::InlHostByteOrder());
}
break;
}
case MPXRegSet:
llvm_unreachable("MPX regset should have returned error");
}
return error;
}
Status NativeRegisterContextFreeBSD_x86::WriteRegister(
const RegisterInfo *reg_info, const RegisterValue &reg_value) {
Status error;
if (!reg_info) {
error = Status::FromErrorString("reg_info NULL");
return error;
}
uint32_t reg = reg_info->kinds[lldb::eRegisterKindLLDB];
if (reg == LLDB_INVALID_REGNUM) {
// This is likely an internal register for lldb use only and should not be
// directly queried.
error = Status::FromErrorStringWithFormat(
"register \"%s\" is an internal-only lldb "
"register, cannot read directly",
reg_info->name);
return error;
}
std::optional<RegSetKind> opt_set = GetSetForNativeRegNum(reg);
if (!opt_set) {
// This is likely an internal register for lldb use only and should not be
// directly queried.
error = Status::FromErrorStringWithFormat(
"register \"%s\" is in unrecognized set", reg_info->name);
return error;
}
RegSetKind set = opt_set.value();
error = ReadRegisterSet(set);
if (error.Fail())
return error;
switch (set) {
case GPRegSet:
case FPRegSet:
case DBRegSet: {
void *data = GetOffsetRegSetData(set, reg_info->byte_offset);
FXSAVE *fpr = reinterpret_cast<FXSAVE *>(m_fpr.data());
if (data == &fpr->ftag) // ftag
fpr->ftag = FullToAbridgedTagWord(reg_value.GetAsUInt16());
else
::memcpy(data, reg_value.GetBytes(), reg_value.GetByteSize());
break;
}
case YMMRegSet: {
std::optional<YMMSplitPtr> ymm_reg = GetYMMSplitReg(reg);
if (!ymm_reg) {
error = Status::FromErrorStringWithFormat(
"register \"%s\" not supported by CPU/kernel", reg_info->name);
} else {
YMMReg ymm;
::memcpy(ymm.bytes, reg_value.GetBytes(), reg_value.GetByteSize());
YMMToXState(ymm, ymm_reg->xmm, ymm_reg->ymm_hi);
}
break;
}
case MPXRegSet:
llvm_unreachable("MPX regset should have returned error");
}
return WriteRegisterSet(set);
}
Status NativeRegisterContextFreeBSD_x86::ReadAllRegisterValues(
lldb::WritableDataBufferSP &data_sp) {
Status error;
data_sp.reset(new DataBufferHeap(REG_CONTEXT_SIZE, 0));
error = ReadRegisterSet(GPRegSet);
if (error.Fail())
return error;
uint8_t *dst = data_sp->GetBytes();
::memcpy(dst, m_gpr.data(), GetRegisterInfoInterface().GetGPRSize());
dst += GetRegisterInfoInterface().GetGPRSize();
return error;
}
Status NativeRegisterContextFreeBSD_x86::WriteAllRegisterValues(
const lldb::DataBufferSP &data_sp) {
Status error;
if (!data_sp) {
error = Status::FromErrorStringWithFormat(
"NativeRegisterContextFreeBSD_x86::%s invalid data_sp provided",
__FUNCTION__);
return error;
}
if (data_sp->GetByteSize() != REG_CONTEXT_SIZE) {
error = Status::FromErrorStringWithFormat(
"NativeRegisterContextFreeBSD_x86::%s data_sp contained mismatched "
"data size, expected %zu, actual %" PRIu64,
__FUNCTION__, REG_CONTEXT_SIZE, data_sp->GetByteSize());
return error;
}
const uint8_t *src = data_sp->GetBytes();
if (src == nullptr) {
error = Status::FromErrorStringWithFormat(
"NativeRegisterContextFreeBSD_x86::%s "
"DataBuffer::GetBytes() returned a null "
"pointer",
__FUNCTION__);
return error;
}
::memcpy(m_gpr.data(), src, GetRegisterInfoInterface().GetGPRSize());
error = WriteRegisterSet(GPRegSet);
if (error.Fail())
return error;
src += GetRegisterInfoInterface().GetGPRSize();
return error;
}
llvm::Error NativeRegisterContextFreeBSD_x86::CopyHardwareWatchpointsFrom(
NativeRegisterContextFreeBSD &source) {
auto &r_source = static_cast<NativeRegisterContextFreeBSD_x86 &>(source);
// NB: This implicitly reads the whole dbreg set.
RegisterValue dr7;
Status res = r_source.ReadRegister(GetDR(7), dr7);
if (!res.Fail()) {
// copy dbregs only if any watchpoints were set
if ((dr7.GetAsUInt64() & 0xFF) == 0)
return llvm::Error::success();
m_dbr = r_source.m_dbr;
res = WriteRegisterSet(DBRegSet);
}
return res.ToError();
}
uint8_t *
NativeRegisterContextFreeBSD_x86::GetOffsetRegSetData(RegSetKind set,
size_t reg_offset) {
uint8_t *base;
switch (set) {
case GPRegSet:
base = m_gpr.data();
break;
case FPRegSet:
base = m_fpr.data();
break;
case DBRegSet:
base = m_dbr.data();
break;
case YMMRegSet:
llvm_unreachable("GetRegSetData() is unsuitable for this regset.");
case MPXRegSet:
llvm_unreachable("MPX regset should have returned error");
}
assert(reg_offset >= m_regset_offsets[set]);
return base + (reg_offset - m_regset_offsets[set]);
}
std::optional<NativeRegisterContextFreeBSD_x86::YMMSplitPtr>
NativeRegisterContextFreeBSD_x86::GetYMMSplitReg(uint32_t reg) {
uint32_t offset = m_xsave_offsets[YMMRegSet];
if (offset == LLDB_INVALID_XSAVE_OFFSET)
return std::nullopt;
uint32_t reg_index;
switch (GetRegisterInfoInterface().GetTargetArchitecture().GetMachine()) {
case llvm::Triple::x86:
reg_index = reg - lldb_ymm0_i386;
break;
case llvm::Triple::x86_64:
reg_index = reg - lldb_ymm0_x86_64;
break;
default:
llvm_unreachable("Unhandled target architecture.");
}
auto *fpreg = reinterpret_cast<struct savexmm_ymm *>(m_xsave.data());
auto *ymmreg = reinterpret_cast<struct ymmacc *>(m_xsave.data() + offset);
return YMMSplitPtr{&fpreg->sv_xmm[reg_index], &ymmreg[reg_index]};
}
#endif // defined(__i386__) || defined(__x86_64__)