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https://github.com/intel/llvm.git
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[lldb] [gdb-remote] Support client fallback for servers without reg defs
Provide minimal register definition defaults for working with servers that implement neither target.xml nor qRegisterInfo packets. This is useful e.g. when interacting with FreeBSD's kernel minimal gdbserver that does not send target.xml but uses the same layout for its supported register subset as GDB. The prerequisite for this is the ability to determine the correct architecture, e.g. from the target executable. Differential Revision: https://reviews.llvm.org/D116896
This commit is contained in:
Michał Górny
@@ -25,6 +25,7 @@ add_lldb_library(lldbPluginProcessGDBRemote PLUGIN
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GDBRemoteCommunicationServerLLGS.cpp
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GDBRemoteCommunicationServerPlatform.cpp
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GDBRemoteRegisterContext.cpp
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GDBRemoteRegisterFallback.cpp
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ProcessGDBRemote.cpp
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ProcessGDBRemoteLog.cpp
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ThreadGDBRemote.cpp
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@@ -0,0 +1,86 @@
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//===-- GDBRemoteRegisterFallback.cpp -------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "GDBRemoteRegisterFallback.h"
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namespace lldb_private {
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namespace process_gdb_remote {
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#define REG(name, size) \
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DynamicRegisterInfo::Register { \
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ConstString(#name), empty_alt_name, reg_set, size, LLDB_INVALID_INDEX32, \
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lldb::eEncodingUint, lldb::eFormatHex, LLDB_INVALID_REGNUM, \
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LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, {}, {} \
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}
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#define R64(name) REG(name, 8)
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#define R32(name) REG(name, 4)
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static std::vector<DynamicRegisterInfo::Register> GetRegisters_aarch64() {
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ConstString empty_alt_name;
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ConstString reg_set{"general purpose registers"};
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std::vector<DynamicRegisterInfo::Register> registers{
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R64(x0), R64(x1), R64(x2), R64(x3), R64(x4), R64(x5), R64(x6),
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R64(x7), R64(x8), R64(x9), R64(x10), R64(x11), R64(x12), R64(x13),
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R64(x14), R64(x15), R64(x16), R64(x17), R64(x18), R64(x19), R64(x20),
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R64(x21), R64(x22), R64(x23), R64(x24), R64(x25), R64(x26), R64(x27),
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R64(x28), R64(x29), R64(x30), R64(sp), R64(pc), R32(cpsr),
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};
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return registers;
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}
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static std::vector<DynamicRegisterInfo::Register> GetRegisters_x86() {
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ConstString empty_alt_name;
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ConstString reg_set{"general purpose registers"};
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std::vector<DynamicRegisterInfo::Register> registers{
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R32(eax), R32(ecx), R32(edx), R32(ebx), R32(esp), R32(ebp),
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R32(esi), R32(edi), R32(eip), R32(eflags), R32(cs), R32(ss),
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R32(ds), R32(es), R32(fs), R32(gs),
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};
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return registers;
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}
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static std::vector<DynamicRegisterInfo::Register> GetRegisters_x86_64() {
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ConstString empty_alt_name;
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ConstString reg_set{"general purpose registers"};
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std::vector<DynamicRegisterInfo::Register> registers{
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R64(rax), R64(rbx), R64(rcx), R64(rdx), R64(rsi), R64(rdi),
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R64(rbp), R64(rsp), R64(r8), R64(r9), R64(r10), R64(r11),
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R64(r12), R64(r13), R64(r14), R64(r15), R64(rip), R32(eflags),
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R32(cs), R32(ss), R32(ds), R32(es), R32(fs), R32(gs),
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};
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return registers;
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}
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#undef R32
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#undef R64
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#undef REG
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std::vector<DynamicRegisterInfo::Register>
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GetFallbackRegisters(const ArchSpec &arch_to_use) {
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switch (arch_to_use.GetMachine()) {
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case llvm::Triple::aarch64:
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return GetRegisters_aarch64();
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case llvm::Triple::x86:
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return GetRegisters_x86();
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case llvm::Triple::x86_64:
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return GetRegisters_x86_64();
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default:
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break;
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}
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return {};
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}
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} // namespace process_gdb_remote
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} // namespace lldb_private
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@@ -0,0 +1,26 @@
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//===-- GDBRemoteRegisterFallback.h -----------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLDB_SOURCE_PLUGINS_PROCESS_GDB_REMOTE_GDBREMOTEREGISTERFALLBACK_H
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#define LLDB_SOURCE_PLUGINS_PROCESS_GDB_REMOTE_GDBREMOTEREGISTERFALLBACK_H
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#include <vector>
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#include "lldb/Target/DynamicRegisterInfo.h"
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#include "lldb/Utility/ArchSpec.h"
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namespace lldb_private {
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namespace process_gdb_remote {
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std::vector<DynamicRegisterInfo::Register>
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GetFallbackRegisters(const ArchSpec &arch_to_use);
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} // namespace process_gdb_remote
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} // namespace lldb_private
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#endif // LLDB_SOURCE_PLUGINS_PROCESS_GDB_REMOTE_GDBREMOTEREGISTERFALLBACK_H
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@@ -72,6 +72,7 @@
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#include <thread>
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#include "GDBRemoteRegisterContext.h"
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#include "GDBRemoteRegisterFallback.h"
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#include "Plugins/Platform/MacOSX/PlatformRemoteiOS.h"
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#include "Plugins/Process/Utility/GDBRemoteSignals.h"
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#include "Plugins/Process/Utility/InferiorCallPOSIX.h"
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@@ -394,6 +395,7 @@ void ProcessGDBRemote::BuildDynamicRegisterInfo(bool force) {
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// 2 - If the target definition doesn't have any of the info from the
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// target.xml (registers) then proceed to read the target.xml.
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// 3 - Fall back on the qRegisterInfo packets.
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// 4 - Use hardcoded defaults if available.
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FileSpec target_definition_fspec =
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GetGlobalPluginProperties().GetTargetDefinitionFile();
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@@ -507,6 +509,9 @@ void ProcessGDBRemote::BuildDynamicRegisterInfo(bool force) {
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}
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}
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if (registers.empty())
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registers = GetFallbackRegisters(arch_to_use);
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AddRemoteRegisters(registers, arch_to_use);
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}
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@@ -0,0 +1,346 @@
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from __future__ import print_function
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import lldb
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from lldbsuite.test.lldbtest import *
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from lldbsuite.test.decorators import *
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from lldbsuite.test.gdbclientutils import *
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from lldbsuite.test.lldbgdbclient import GDBRemoteTestBase
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import binascii
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class TestGDBServerTargetXML(GDBRemoteTestBase):
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mydir = TestBase.compute_mydir(__file__)
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@staticmethod
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def filecheck_to_blob(fc):
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for l in fc.strip().splitlines():
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val = l.split('0x')[1]
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yield binascii.b2a_hex(bytes(reversed(binascii.a2b_hex(val)))).decode()
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@skipIfRemote
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@skipIfLLVMTargetMissing("X86")
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def test_x86_64_regs(self):
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"""Test grabbing various x86_64 registers from gdbserver."""
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GPRS = '''
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CHECK-AMD64-DAG: rax = 0x0807060504030201
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CHECK-AMD64-DAG: rbx = 0x1817161514131211
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CHECK-AMD64-DAG: rcx = 0x2827262524232221
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CHECK-AMD64-DAG: rdx = 0x3837363534333231
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CHECK-AMD64-DAG: rsi = 0x4847464544434241
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CHECK-AMD64-DAG: rdi = 0x5857565554535251
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CHECK-AMD64-DAG: rbp = 0x6867666564636261
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CHECK-AMD64-DAG: rsp = 0x7877767574737271
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CHECK-AMD64-DAG: r8 = 0x8887868584838281
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CHECK-AMD64-DAG: r9 = 0x9897969594939291
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CHECK-AMD64-DAG: r10 = 0xa8a7a6a5a4a3a2a1
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CHECK-AMD64-DAG: r11 = 0xb8b7b6b5b4b3b2b1
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CHECK-AMD64-DAG: r12 = 0xc8c7c6c5c4c3c2c1
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CHECK-AMD64-DAG: r13 = 0xd8d7d6d5d4d3d2d1
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CHECK-AMD64-DAG: r14 = 0xe8e7e6e5e4e3e2e1
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CHECK-AMD64-DAG: r15 = 0xf8f7f6f5f4f3f2f1
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CHECK-AMD64-DAG: rip = 0x100f0e0d0c0b0a09
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CHECK-AMD64-DAG: eflags = 0x1c1b1a19
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CHECK-AMD64-DAG: cs = 0x2c2b2a29
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CHECK-AMD64-DAG: ss = 0x3c3b3a39
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'''
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SUPPL = '''
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CHECK-AMD64-DAG: eax = 0x04030201
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CHECK-AMD64-DAG: ebx = 0x14131211
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CHECK-AMD64-DAG: ecx = 0x24232221
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CHECK-AMD64-DAG: edx = 0x34333231
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CHECK-AMD64-DAG: esi = 0x44434241
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CHECK-AMD64-DAG: edi = 0x54535251
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CHECK-AMD64-DAG: ebp = 0x64636261
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CHECK-AMD64-DAG: esp = 0x74737271
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CHECK-AMD64-DAG: r8d = 0x84838281
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CHECK-AMD64-DAG: r9d = 0x94939291
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CHECK-AMD64-DAG: r10d = 0xa4a3a2a1
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CHECK-AMD64-DAG: r11d = 0xb4b3b2b1
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CHECK-AMD64-DAG: r12d = 0xc4c3c2c1
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CHECK-AMD64-DAG: r13d = 0xd4d3d2d1
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CHECK-AMD64-DAG: r14d = 0xe4e3e2e1
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CHECK-AMD64-DAG: r15d = 0xf4f3f2f1
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CHECK-AMD64-DAG: ax = 0x0201
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CHECK-AMD64-DAG: bx = 0x1211
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CHECK-AMD64-DAG: cx = 0x2221
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CHECK-AMD64-DAG: dx = 0x3231
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CHECK-AMD64-DAG: si = 0x4241
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CHECK-AMD64-DAG: di = 0x5251
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CHECK-AMD64-DAG: bp = 0x6261
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CHECK-AMD64-DAG: sp = 0x7271
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CHECK-AMD64-DAG: r8w = 0x8281
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CHECK-AMD64-DAG: r9w = 0x9291
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CHECK-AMD64-DAG: r10w = 0xa2a1
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CHECK-AMD64-DAG: r11w = 0xb2b1
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CHECK-AMD64-DAG: r12w = 0xc2c1
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CHECK-AMD64-DAG: r13w = 0xd2d1
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CHECK-AMD64-DAG: r14w = 0xe2e1
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CHECK-AMD64-DAG: r15w = 0xf2f1
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CHECK-AMD64-DAG: ah = 0x02
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CHECK-AMD64-DAG: bh = 0x12
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CHECK-AMD64-DAG: ch = 0x22
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CHECK-AMD64-DAG: dh = 0x32
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CHECK-AMD64-DAG: al = 0x01
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CHECK-AMD64-DAG: bl = 0x11
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CHECK-AMD64-DAG: cl = 0x21
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CHECK-AMD64-DAG: dl = 0x31
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CHECK-AMD64-DAG: sil = 0x41
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CHECK-AMD64-DAG: dil = 0x51
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CHECK-AMD64-DAG: bpl = 0x61
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CHECK-AMD64-DAG: spl = 0x71
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CHECK-AMD64-DAG: r8l = 0x81
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CHECK-AMD64-DAG: r9l = 0x91
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CHECK-AMD64-DAG: r10l = 0xa1
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CHECK-AMD64-DAG: r11l = 0xb1
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CHECK-AMD64-DAG: r12l = 0xc1
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CHECK-AMD64-DAG: r13l = 0xd1
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CHECK-AMD64-DAG: r14l = 0xe1
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CHECK-AMD64-DAG: r15l = 0xf1
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'''
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class MyResponder(MockGDBServerResponder):
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reg_data = ''.join(self.filecheck_to_blob(GPRS))
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def readRegister(self, regnum):
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return ""
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def readRegisters(self):
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return self.reg_data
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def haltReason(self):
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return "T02thread:1ff0d;threads:1ff0d;thread-pcs:000000010001bc00;07:0102030405060708;10:1112131415161718;"
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self.server.responder = MyResponder()
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target = self.createTarget("basic_eh_frame.yaml")
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process = self.connect(target)
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lldbutil.expect_state_changes(self, self.dbg.GetListener(), process,
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[lldb.eStateStopped])
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# test all registers
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self.filecheck("register read --all", __file__,
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filecheck_options='--check-prefix=CHECK-AMD64')
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# test generic aliases
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self.match("register read arg4",
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["rcx = 0x2827262524232221"])
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self.match("register read arg3",
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["rdx = 0x3837363534333231"])
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self.match("register read arg2",
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["rsi = 0x4847464544434241"])
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self.match("register read arg1",
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["rdi = 0x5857565554535251"])
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self.match("register read fp",
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["rbp = 0x6867666564636261"])
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self.match("register read sp",
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["rsp = 0x7877767574737271"])
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self.match("register read arg5",
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["r8 = 0x8887868584838281"])
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self.match("register read arg6",
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["r9 = 0x9897969594939291"])
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self.match("register read pc",
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["rip = 0x100f0e0d0c0b0a09"])
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self.match("register read flags",
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["eflags = 0x1c1b1a19"])
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@skipIfRemote
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@skipIfLLVMTargetMissing("AArch64")
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def test_aarch64_regs(self):
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"""Test grabbing various aarch64 registers from gdbserver."""
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GPRS = '''
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CHECK-AARCH64-DAG: x0 = 0x0001020304050607
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CHECK-AARCH64-DAG: x1 = 0x0102030405060708
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CHECK-AARCH64-DAG: x2 = 0x0203040506070809
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CHECK-AARCH64-DAG: x3 = 0x030405060708090a
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CHECK-AARCH64-DAG: x4 = 0x0405060708090a0b
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CHECK-AARCH64-DAG: x5 = 0x05060708090a0b0c
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CHECK-AARCH64-DAG: x6 = 0x060708090a0b0c0d
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CHECK-AARCH64-DAG: x7 = 0x0708090a0b0c0d0e
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CHECK-AARCH64-DAG: x8 = 0x08090a0b0c0d0e0f
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CHECK-AARCH64-DAG: x9 = 0x090a0b0c0d0e0f10
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CHECK-AARCH64-DAG: x10 = 0x0a0b0c0d0e0f1011
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CHECK-AARCH64-DAG: x11 = 0x0b0c0d0e0f101112
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CHECK-AARCH64-DAG: x12 = 0x0c0d0e0f10111213
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CHECK-AARCH64-DAG: x13 = 0x0d0e0f1011121314
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CHECK-AARCH64-DAG: x14 = 0x0e0f101112131415
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CHECK-AARCH64-DAG: x15 = 0x0f10111213141516
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CHECK-AARCH64-DAG: x16 = 0x1011121314151617
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CHECK-AARCH64-DAG: x17 = 0x1112131415161718
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CHECK-AARCH64-DAG: x18 = 0x1213141516171819
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CHECK-AARCH64-DAG: x19 = 0x131415161718191a
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CHECK-AARCH64-DAG: x20 = 0x1415161718191a1b
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CHECK-AARCH64-DAG: x21 = 0x15161718191a1b1c
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CHECK-AARCH64-DAG: x22 = 0x161718191a1b1c1d
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CHECK-AARCH64-DAG: x23 = 0x1718191a1b1c1d1e
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CHECK-AARCH64-DAG: x24 = 0x18191a1b1c1d1e1f
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CHECK-AARCH64-DAG: x25 = 0x191a1b1c1d1e1f20
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CHECK-AARCH64-DAG: x26 = 0x1a1b1c1d1e1f2021
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CHECK-AARCH64-DAG: x27 = 0x1b1c1d1e1f202122
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CHECK-AARCH64-DAG: x28 = 0x1c1d1e1f20212223
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CHECK-AARCH64-DAG: x29 = 0x1d1e1f2021222324
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CHECK-AARCH64-DAG: x30 = 0x1e1f202122232425
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CHECK-AARCH64-DAG: sp = 0x1f20212223242526
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CHECK-AARCH64-DAG: pc = 0x2021222324252627
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CHECK-AARCH64-DAG: cpsr = 0x21222324
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'''
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SUPPL = '''
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CHECK-AARCH64-DAG: w0 = 0x04050607
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CHECK-AARCH64-DAG: w1 = 0x05060708
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CHECK-AARCH64-DAG: w2 = 0x06070809
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CHECK-AARCH64-DAG: w3 = 0x0708090a
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CHECK-AARCH64-DAG: w4 = 0x08090a0b
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CHECK-AARCH64-DAG: w5 = 0x090a0b0c
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CHECK-AARCH64-DAG: w6 = 0x0a0b0c0d
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CHECK-AARCH64-DAG: w7 = 0x0b0c0d0e
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CHECK-AARCH64-DAG: w8 = 0x0c0d0e0f
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CHECK-AARCH64-DAG: w9 = 0x0d0e0f10
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CHECK-AARCH64-DAG: w10 = 0x0e0f1011
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CHECK-AARCH64-DAG: w11 = 0x0f101112
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CHECK-AARCH64-DAG: w12 = 0x10111213
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CHECK-AARCH64-DAG: w13 = 0x11121314
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CHECK-AARCH64-DAG: w14 = 0x12131415
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CHECK-AARCH64-DAG: w15 = 0x13141516
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CHECK-AARCH64-DAG: w16 = 0x14151617
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CHECK-AARCH64-DAG: w17 = 0x15161718
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CHECK-AARCH64-DAG: w18 = 0x16171819
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CHECK-AARCH64-DAG: w19 = 0x1718191a
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CHECK-AARCH64-DAG: w20 = 0x18191a1b
|
||||
CHECK-AARCH64-DAG: w21 = 0x191a1b1c
|
||||
CHECK-AARCH64-DAG: w22 = 0x1a1b1c1d
|
||||
CHECK-AARCH64-DAG: w23 = 0x1b1c1d1e
|
||||
CHECK-AARCH64-DAG: w24 = 0x1c1d1e1f
|
||||
CHECK-AARCH64-DAG: w25 = 0x1d1e1f20
|
||||
CHECK-AARCH64-DAG: w26 = 0x1e1f2021
|
||||
CHECK-AARCH64-DAG: w27 = 0x1f202122
|
||||
CHECK-AARCH64-DAG: w28 = 0x20212223
|
||||
CHECK-AARCH64-DAG: w29 = 0x21222324
|
||||
CHECK-AARCH64-DAG: w30 = 0x22232425
|
||||
CHECK-AARCH64-DAG: w31 = 0x23242526
|
||||
'''
|
||||
|
||||
class MyResponder(MockGDBServerResponder):
|
||||
reg_data = ''.join(self.filecheck_to_blob(GPRS))
|
||||
|
||||
def readRegister(self, regnum):
|
||||
return ""
|
||||
|
||||
def readRegisters(self):
|
||||
return self.reg_data
|
||||
|
||||
def haltReason(self):
|
||||
return "T02thread:1ff0d;threads:1ff0d;thread-pcs:000000010001bc00;07:0102030405060708;10:1112131415161718;"
|
||||
|
||||
self.server.responder = MyResponder()
|
||||
|
||||
target = self.createTarget("basic_eh_frame-aarch64.yaml")
|
||||
process = self.connect(target)
|
||||
lldbutil.expect_state_changes(self, self.dbg.GetListener(), process,
|
||||
[lldb.eStateStopped])
|
||||
|
||||
# test all registers
|
||||
self.filecheck("register read --all", __file__,
|
||||
filecheck_options='--check-prefix=CHECK-AARCH64')
|
||||
|
||||
# test generic aliases
|
||||
self.match("register read arg1",
|
||||
["x0 = 0x0001020304050607"])
|
||||
self.match("register read arg2",
|
||||
["x1 = 0x0102030405060708"])
|
||||
self.match("register read fp",
|
||||
["x29 = 0x1d1e1f2021222324"])
|
||||
self.match("register read lr",
|
||||
["x30 = 0x1e1f202122232425"])
|
||||
self.match("register read ra",
|
||||
["x30 = 0x1e1f202122232425"])
|
||||
self.match("register read flags",
|
||||
["cpsr = 0x21222324"])
|
||||
|
||||
@skipIfRemote
|
||||
@skipIfLLVMTargetMissing("X86")
|
||||
def test_i386_regs(self):
|
||||
"""Test grabbing various i386 registers from gdbserver."""
|
||||
|
||||
GPRS = '''
|
||||
CHECK-I386-DAG: eax = 0x04030201
|
||||
CHECK-I386-DAG: ecx = 0x14131211
|
||||
CHECK-I386-DAG: edx = 0x24232221
|
||||
CHECK-I386-DAG: ebx = 0x34333231
|
||||
CHECK-I386-DAG: esp = 0x44434241
|
||||
CHECK-I386-DAG: ebp = 0x54535251
|
||||
CHECK-I386-DAG: esi = 0x64636261
|
||||
CHECK-I386-DAG: edi = 0x74737271
|
||||
CHECK-I386-DAG: eip = 0x84838281
|
||||
CHECK-I386-DAG: eflags = 0x94939291
|
||||
CHECK-I386-DAG: cs = 0xa4a3a2a1
|
||||
CHECK-I386-DAG: ss = 0xb4b3b2b1
|
||||
CHECK-I386-DAG: ds = 0xc4c3c2c1
|
||||
CHECK-I386-DAG: es = 0xd4d3d2d1
|
||||
CHECK-I386-DAG: fs = 0xe4e3e2e1
|
||||
CHECK-I386-DAG: gs = 0xf4f3f2f1
|
||||
'''
|
||||
|
||||
SUPPL = '''
|
||||
CHECK-I386-DAG: ax = 0x0201
|
||||
CHECK-I386-DAG: cx = 0x1211
|
||||
CHECK-I386-DAG: dx = 0x2221
|
||||
CHECK-I386-DAG: bx = 0x3231
|
||||
CHECK-I386-DAG: sp = 0x4241
|
||||
CHECK-I386-DAG: bp = 0x5251
|
||||
CHECK-I386-DAG: si = 0x6261
|
||||
CHECK-I386-DAG: di = 0x7271
|
||||
|
||||
CHECK-I386-DAG: ah = 0x02
|
||||
CHECK-I386-DAG: ch = 0x12
|
||||
CHECK-I386-DAG: dh = 0x22
|
||||
CHECK-I386-DAG: bh = 0x32
|
||||
|
||||
CHECK-I386-DAG: al = 0x01
|
||||
CHECK-I386-DAG: cl = 0x11
|
||||
CHECK-I386-DAG: dl = 0x21
|
||||
CHECK-I386-DAG: bl = 0x31
|
||||
CHECK-I386-DAG: spl = 0x41
|
||||
CHECK-I386-DAG: bpl = 0x51
|
||||
CHECK-I386-DAG: sil = 0x61
|
||||
CHECK-I386-DAG: dil = 0x71
|
||||
'''
|
||||
|
||||
class MyResponder(MockGDBServerResponder):
|
||||
reg_data = ''.join(self.filecheck_to_blob(GPRS))
|
||||
|
||||
def readRegister(self, regnum):
|
||||
return ""
|
||||
|
||||
def readRegisters(self):
|
||||
return self.reg_data
|
||||
|
||||
def haltReason(self):
|
||||
return "T02thread:1ff0d;threads:1ff0d;thread-pcs:000000010001bc00;07:0102030405060708;10:1112131415161718;"
|
||||
|
||||
self.server.responder = MyResponder()
|
||||
|
||||
target = self.createTarget("basic_eh_frame-i386.yaml")
|
||||
process = self.connect(target)
|
||||
lldbutil.expect_state_changes(self, self.dbg.GetListener(), process,
|
||||
[lldb.eStateStopped])
|
||||
|
||||
# test all registers
|
||||
self.filecheck("register read --all", __file__,
|
||||
filecheck_options='--check-prefix=CHECK-I386')
|
||||
|
||||
# test generic aliases
|
||||
self.match("register read fp",
|
||||
["ebp = 0x54535251"])
|
||||
self.match("register read sp",
|
||||
["esp = 0x44434241"])
|
||||
self.match("register read pc",
|
||||
["eip = 0x84838281"])
|
||||
self.match("register read flags",
|
||||
["eflags = 0x94939291"])
|
||||
Reference in New Issue
Block a user