omjavaid updated this revision to Diff 340686.
omjavaid added a comment.
Moved mask calculation to ABISysV_arm64 class.
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D99944/new/
https://reviews.llvm.org/D99944
Files:
lldb/source/Plugins/ABI/AArch64/ABISysV_arm64.cpp
lldb/source/Plugins/ABI/AArch64/ABISysV_arm64.h
lldb/test/API/functionalities/postmortem/elf-core/TestLinuxCore.py
lldb/test/API/functionalities/postmortem/elf-core/linux-aarch64-pac.out
Index: lldb/test/API/functionalities/postmortem/elf-core/TestLinuxCore.py
===================================================================
--- lldb/test/API/functionalities/postmortem/elf-core/TestLinuxCore.py
+++ lldb/test/API/functionalities/postmortem/elf-core/TestLinuxCore.py
@@ -20,6 +20,7 @@
mydir = TestBase.compute_mydir(__file__)
_aarch64_pid = 37688
+ _aarch64_pac_pid = 387
_i386_pid = 32306
_x86_64_pid = 32259
_s390x_pid = 1045
@@ -135,7 +136,7 @@
error = lldb.SBError()
bytesread = process.ReadMemory(0x400ff0, 20, error)
-
+
# read only 16 bytes without zero bytes filling
self.assertEqual(len(bytesread), 16)
self.dbg.DeleteTarget(target)
@@ -257,6 +258,18 @@
self.dbg.DeleteTarget(target)
+ @skipIfLLVMTargetMissing("AArch64")
+ def test_aarch64_pac(self):
+ """Test that lldb can unwind stack for AArch64 elf core file with PAC enabled."""
+
+ target = self.dbg.CreateTarget("linux-aarch64-pac.out")
+ self.assertTrue(target, VALID_TARGET)
+ process = target.LoadCore("linux-aarch64-pac.core")
+
+ self.check_all(process, self._aarch64_pac_pid, self._aarch64_regions, "a.out")
+
+ self.dbg.DeleteTarget(target)
+
@skipIfLLVMTargetMissing("AArch64")
@expectedFailureAll(archs=["aarch64"], oslist=["freebsd"],
bugnumber="llvm.org/pr49415")
Index: lldb/source/Plugins/ABI/AArch64/ABISysV_arm64.h
===================================================================
--- lldb/source/Plugins/ABI/AArch64/ABISysV_arm64.h
+++ lldb/source/Plugins/ABI/AArch64/ABISysV_arm64.h
@@ -85,6 +85,9 @@
uint32_t GetPluginVersion() override;
+ lldb::addr_t FixCodeAddress(lldb::addr_t pc) override;
+ lldb::addr_t FixDataAddress(lldb::addr_t pc) override;
+
protected:
lldb::ValueObjectSP
GetReturnValueObjectImpl(lldb_private::Thread &thread,
Index: lldb/source/Plugins/ABI/AArch64/ABISysV_arm64.cpp
===================================================================
--- lldb/source/Plugins/ABI/AArch64/ABISysV_arm64.cpp
+++ lldb/source/Plugins/ABI/AArch64/ABISysV_arm64.cpp
@@ -787,6 +787,56 @@
return (pc & pac_sign_extension) ? pc | mask : pc & (~mask);
}
+// Reads code or data address mask for the current Linux process.
+static lldb::addr_t ReadLinuxProcessAddressMask(lldb::ProcessSP process_sp,
+ llvm::StringRef reg_name) {
+ // Linux configures user-space virtual addresses with top byte ignored.
+ // We set default value of mask such that top byte is masked out.
+ uint64_t address_mask = ~((1ULL << 56) - 1);
+ // If Pointer Authentication feature is enabled then Linux exposes
+ // PAC data and code mask register. Try reading relevant register
+ // below and merge it with default address mask calculated above.
+ lldb::ThreadSP thread_sp = process_sp->GetThreadList().GetSelectedThread();
+ if (thread_sp) {
+ lldb::RegisterContextSP reg_ctx_sp = thread_sp->GetRegisterContext();
+ if (reg_ctx_sp) {
+ const RegisterInfo *reg_info =
+ reg_ctx_sp->GetRegisterInfoByName(reg_name, 0);
+ if (reg_info) {
+ lldb::addr_t mask_reg_val = reg_ctx_sp->ReadRegisterAsUnsigned(
+ reg_info->kinds[eRegisterKindLLDB], LLDB_INVALID_ADDRESS);
+ if (mask_reg_val != LLDB_INVALID_ADDRESS)
+ address_mask |= mask_reg_val;
+ }
+ }
+ }
+ return address_mask;
+}
+
+lldb::addr_t ABISysV_arm64::FixCodeAddress(lldb::addr_t pc) {
+ if (lldb::ProcessSP process_sp = GetProcessSP()) {
+ if (process_sp->GetTarget().GetArchitecture().GetTriple().isOSLinux() &&
+ !process_sp->GetCodeAddressMask())
+ process_sp->SetCodeAddressMask(
+ ReadLinuxProcessAddressMask(process_sp, "code_mask"));
+
+ return FixAddress(pc, process_sp->GetCodeAddressMask());
+ }
+ return pc;
+}
+
+lldb::addr_t ABISysV_arm64::FixDataAddress(lldb::addr_t pc) {
+ if (lldb::ProcessSP process_sp = GetProcessSP()) {
+ if (process_sp->GetTarget().GetArchitecture().GetTriple().isOSLinux() &&
+ !process_sp->GetDataAddressMask())
+ process_sp->SetDataAddressMask(
+ ReadLinuxProcessAddressMask(process_sp, "data_mask"));
+
+ return FixAddress(pc, process_sp->GetDataAddressMask());
+ }
+ return pc;
+}
+
void ABISysV_arm64::Initialize() {
PluginManager::RegisterPlugin(GetPluginNameStatic(),
"SysV ABI for AArch64 targets", CreateInstance);
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