Add support for ARM and ARM64 breakpad generated minidump files.

[clayborg]

Summary

In this patch I add support for ARM and ARM64 break pad files. There are two flavors of ARM: Apple where FP is R7, and non Apple where FP is R11. Added minimal tests that load up ARM64 and the two flavors or ARM core files with a single thread and known register values in each register. Each register is checked for the exact value.

[lemo]

Looks really good, a few comments inline.

This may not big a big deal, but the part about FP (and Apple vs. non-Apple) is confusing: the FP is a pretty weak convention, and in some ABIs is not actually "fixed" (ex. FP can be either R7 or R11, which in turn can be used as GPRs). If Apple sticks to a strict usage it makes sense to name it but then maybe we should just not name any FP for non-Apple?

source/Plugins/Process/minidump/MinidumpParser.cpp

148–149

instead of useing m_arch as a cache I'd explicitly initialize it in MinidumpParser::Initialize()

150–154

why is this needed when we have MinidumpOSPlatform::Linux ?

source/Plugins/Process/minidump/ProcessMinidump.cpp

179

shouldn't this be a check resulting in an error? why do we need to make this implicit adjustment here?

source/Plugins/Process/minidump/RegisterContextMinidump_ARM.cpp

193

constexpr?

196

use std::array for these kind of static arrays? (debug bounds checks, easy access to the static size, ...)

226

symbolic constants or use the array size?

232

lldb_assert ?

243

not a big deal, but this kind of accessors for constants can be constexpr themselves

249

failfast if out of bounds? who'd pass an invalid index and expect a meaninful result?
(btw, std::array would provide the debug checks if that's all that we want)

282

remove unused parameter name or [[maybe_unused]]

source/Plugins/Process/minidump/RegisterContextMinidump_ARM.h

83

= nullptr;

84

0;

source/Plugins/Process/minidump/RegisterContextMinidump_ARM64.h

38

default instead of {} ?

[clayborg]

I will make update the patch with many of the suggested inline comments.

source/Plugins/Process/minidump/MinidumpParser.cpp

149

Can do

154

I have run into some minidump files that don't have linux set corrreclty as the OS, but they do have "linux" in the description. So this is to handle those cases. I have told the people that are generating these about the issue and they will fix it, but we have minidump files out in the wild that don't set linux as the OS correctly.

source/Plugins/Process/minidump/ProcessMinidump.cpp

179

By default the "host" platform is selected and it was incorrectly being used along with _any_ triple. So we need to adjust the platform if the host platform isn't compatible. The platform being set correctly helps with many things during a debug session like finding symbols and much more.

[lemo]

source/Plugins/Process/minidump/MinidumpParser.cpp

154

1. any idea where this minidumps originate from?
2. should we raise some kind of signal when we go down this path? print an warning or at least verbose logging?

source/Plugins/Process/minidump/ProcessMinidump.cpp

179

Nice catch/fix in that case!

Just curious: It still seems a bit surprising to me to have the target mutated by the process object - is that how it's normally done in other cases?

[labath]

source/Plugins/Process/minidump/ProcessMinidump.cpp

179

I agree that this looks out of place in the minidump plugin. I don't see any other process/core file plugin doing that, but there should be nothing special about minidump files as far as platform selection goes, right? (In fact I wouldn't be surprised if this is causing problems for us already, as some of our elf core tests are disabled on windows).

Maybe this could be moved at least to a binary-format-agnostic place, so that all core file plugins benefit from this?

source/Plugins/Process/minidump/RegisterContextMinidump_ARM64.cpp

44–57

It looks like these don't define any of the sub-registers (W, H, S and D sets)?

Btw, for x86, the way we avoided the need to define all of these registers all over again is that we took the register descriptions from the minidump file, and rearranged them in memory to match what the existing register contexts (for elf core files) expect. Maybe you could do that here too? Since you're already storing a copy of the register data in the m_regs field, it shouldn't even impact the memory footprint (but it will make all of this goo go away).

[lemo]

source/Plugins/Process/minidump/RegisterContextMinidump_ARM.cpp

52

Pavel's comment reminded me: what about the S registers (32bit fp) and Q registers (128bit Neon)?

[lemo]

FYI, Breakpad & Crashpad will start generating the Microsoft flavor of ARM
minidumps soon.

[clayborg]

• Fixed inline comments
• Moved platform setting into Target::SetArchitecture(...) instead of doing this manually in the core file code.
• Added ARM64 w0-w31, d0-d31, s0-s31 and h0-h31 registers
• Added ARM s0-s31 and q0-q15 registers
• Improved values in registers in arm and arm64 minidump files to ensure unique values in each register and updated tests to test for it

[clayborg]

source/Plugins/Process/minidump/RegisterContextMinidump_ARM.cpp

193

will do

196

Tried it but it introduces a global constructor. We try to avoid those.

source/Plugins/Process/minidump/RegisterContextMinidump_ARM64.cpp

57

I would rather define a new context and avoid mutating one register context into another. I didn't really like the other register contexts for minidumps. I like to show the actual data that is available, not a translation of one set of data to another.

[lemo]

Thanks Greg, looks good to me (a couple of inline comments left at your discretion)

source/Plugins/Process/minidump/ProcessMinidump.cpp

15

it this set for removal?

source/Plugins/Process/minidump/RegisterContextMinidump_ARM.cpp

196

We shouldn't have a dynamic initializer: that's strange, if that's the case we have a compiler bug on our hands. A quick experiment indicates that even with -O0 recent clang/llvm do the right thing: https://godbolt.org/g/NMUFLP

Is the problem only with arrays of RegisterInfo structs? If that's the case the cause is RegisterInfo itself and std::array should not make a difference (ie. we'd see the dynamic initializer even with plain C arrays)

[clayborg]

Removed unnecessary Xcode project changes and removed #include that wasn't needed.

[clayborg]

source/Plugins/Process/minidump/ProcessMinidump.cpp

15

Ah yes!

source/Plugins/Process/minidump/RegisterContextMinidump_ARM.cpp

196

Not sure why. I was using the latest Xcode and got the warning. RegisterInfo is just a plain struct so it shouldn't cause any issues.

[labath]

Looks great. I only noticed some typos when looking this over again. We can continue the register shuffling discussion offline.

include/lldb/Target/Target.h

929–939

mismatch in the parameter name in the comment and signature

source/Plugins/Process/minidump/MinidumpParser.cpp

497

should error be initialized here?

source/Plugins/Process/minidump/RegisterContextMinidump_ARM64.cpp

57

Since, you're the one doing the work, I am fine leaving this up to you, but I'd like to understand what is it that you didn't like about the x86 register contexts.

In what way do they misrepresent the data available? As far as I can tell, the difference here is just in the internal representation of the data. It should not change the actual values of the registers displayed to the user (if it does, I'd like to fix it). In other words, I should be able to rewrite the implementation here to reshuffle the register order in the same way as x86, and the tests should still pass.

If this is true, then this is only a question of optimizing the internal implementation for some criteria. In this case, I would choose to optimize for code size/readability, and try to avoid defining 200 lines of constants, which largely duplicate what is already given in the other register contexts.

222

llvm style would put spaces between the operators here. Could you run clang-format over the diff?

[clayborg]

• run clang-format
• fix doxygen parameter names

[clayborg]

source/Plugins/Process/minidump/RegisterContextMinidump_ARM64.cpp

58

No need to change the x86. Just seems like more work to map one set of registers to another when/if the actual context is in another format. The ARM registers differ from any other ARM register context as they have 8 "extra" registers, so it didn't make sense to try and map it to another register context. So the "don't like the x86" part is just because it was remapping from one context to another and these register contexts are simple.

[zturner]

Please remember to test with the cmake build when you add or remove files,
as that is the build that all of the buildbots use. I almost reverted this
since it broke every LLDB buildbot, but I noticed that it's just forgetting
to remove the files from the CMakeLists.txt so I'll fix it.

[stella.stamenova]

There are a number of minidump tests that started failing for us on both Linux and Windows and I suspect it's due to this change. Did the unit tests pass for you with the changes on either Linux or Windows?

Failing Tests (6):

lldb-Unit :: Process/minidump/./LLDBMinidumpTests/MinidumpParserTest.GetMemoryListNotPadded
lldb-Unit :: Process/minidump/./LLDBMinidumpTests/MinidumpParserTest.GetMemoryListPadded
lldb-Unit :: Process/minidump/./LLDBMinidumpTests/MinidumpParserTest.GetModuleListNotPadded
lldb-Unit :: Process/minidump/./LLDBMinidumpTests/MinidumpParserTest.GetModuleListPadded
lldb-Unit :: Process/minidump/./LLDBMinidumpTests/MinidumpParserTest.GetThreadListNotPadded
lldb-Unit :: Process/minidump/./LLDBMinidumpTests/MinidumpParserTest.GetThreadListPadded

[teemperor]

I don't see this mentioned here yet, so: This patch also seems to introduce a few hundred warnings with -Wextended-offsetof (which is enabled by default on the macOS builds):

[...]llvm/tools/lldb/source/Plugins/Process/minidump/RegisterContextMinidump_ARM64.cpp:510:5: warning: using extended field designator is an extension [-Wextended-offsetof]                                                                                                                                                                         
    DEF_S(20),                                                                                                                                                                          
    ^~~~~~~~~                                                                                                                                                                           
[...]llvm/tools/lldb/source/Plugins/Process/minidump/RegisterContextMinidump_ARM64.cpp:67:25: note: expanded from macro 'DEF_S'                             
    "s" #i, nullptr, 4, OFFSET(v[i * 16]), eEncodingVector,                    \                                                                                                        
                        ^~~~~~~~~~~~~~~~~                                                                                                                                               
[...]llvm/tools/lldb/source/Plugins/Process/minidump/RegisterContextMinidump_ARM64.cpp:29:20: note: expanded from macro 'OFFSET'                            
#define OFFSET(r) (offsetof(RegisterContextMinidump_ARM64::Context, r))                                                                                                                 
                   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~                                                                                                                  
[...]stddef.h:120:24: note: expanded from macro 'offsetof'                        
#define offsetof(t, d) __builtin_offsetof(t, d)                                                                                                                                         
                       ^                     ~

(And the tests also fail on macOS, but they are probably fixed when the Linux/Windows tests are fixed).

[labath]

I've reverted this to keep the bots green until the issues pointed out
by Stella and Raphael are resolved.

Based on a quick inspection, it seems that the test issue is that
GetSystemInfo call that has been added to MinidumpParser::Initialize
is failing. I guess that's because the hand-crafted(?) minidumps for
these tests don't contain the necessary data.

For the -Wextended-offsetof issue, the way that other register
contexts avoid those is by factoring this out into two offsetof
expressions (offsetof(big_struct, small_struct_field) +
offsetof(small_struct, actual_field)).

include/lldb/Target/Target.h

void ApplyNameToBreakpoints(BreakpointName &bp_name);
   ModuleIsExcludedForUnconstrainedSearches(const lldb::ModuleSP &module_sp);
 
   const ArchSpec &GetArchitecture() const { return m_arch.GetSpec(); }
 
   //------------------------------------------------------------------
   /// Set the architecture for this target.
   ///
   /// If the current target has no Images read in, then this just sets the
-  /// architecture, which will
-  /// be used to select the architecture of the ExecutableModule when that is
-  /// set.
-  /// If the current target has an ExecutableModule, then calling
-  /// SetArchitecture with a different
+  /// architecture, which will be used to select the architecture of the
+  /// ExecutableModule when that is set. If the current target has an
+  /// ExecutableModule, then calling SetArchitecture with a different
   /// architecture from the currently selected one will reset the
-  /// ExecutableModule to that slice
-  /// of the file backing the ExecutableModule.  If the file backing the
-  /// ExecutableModule does not
-  /// contain a fork of this architecture, then this code will return false, and
-  /// the architecture
-  /// won't be changed.
-  /// If the input arch_spec is the same as the already set architecture, this
-  /// is a no-op.
+  /// ExecutableModule to that slice of the file backing the ExecutableModule.
+  /// If the file backing the ExecutableModule does not contain a fork of this
+  /// architecture, then this code will return false, and the architecture
+  /// won't be changed. If the input arch_spec is the same as the already set
+  /// architecture, this is a no-op.
   ///
   /// @param[in] arch_spec
   ///     The new architecture.
   ///
+  /// @param[in] adjust_platform
+  ///     If \b true, then the platform will be adjusted if the currently
+  ///     selected platform is not compatible with the archicture being set.
+  ///     If \b false, then just the architecture will be set even if the
+  ///     currently selected platform isn't compatible (in case it might be
+  ///     manually set following this function call).
+  ///
   /// @return
   ///     \b true if the architecture was successfully set, \bfalse otherwise.
   //------------------------------------------------------------------
-  bool SetArchitecture(const ArchSpec &arch_spec);
+  bool SetArchitecture(const ArchSpec &arch_spec, bool set_platform = false);
 
   bool MergeArchitecture(const ArchSpec &arch_spec);
 
   Architecture *GetArchitecturePlugin() const { return m_arch.GetPlugin(); }
 
   Debugger &GetDebugger() { return m_debugger; }
 
   size_t ReadMemoryFromFileCache(const Address &addr, void *dst, size_t dst_len,

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         262173A318395D4600C52091 /* SectionLoadHistory.cpp in Sources */,
         2689001E13353DDE00698AC0 /* CommandObjectMemory.cpp in Sources */,
         2689001F13353DDE00698AC0 /* CommandObjectPlatform.cpp in Sources */,
         26474CC018D0CB2D0073DEBA /* RegisterContextMach_x86_64.cpp in Sources */,
         2689002013353DDE00698AC0 /* CommandObjectProcess.cpp in Sources */,
         2689002113353DDE00698AC0 /* CommandObjectQuit.cpp in Sources */,
         2689002213353DDE00698AC0 /* CommandObjectRegister.cpp in Sources */,
         26BC17AF18C7F4CB00D2196D /* RegisterContextPOSIXCore_x86_64.cpp in Sources */,
+        2619C4842107A9A2009CDE81 /* RegisterContextMinidump_ARM64.cpp in Sources */,
         2689002313353DDE00698AC0 /* CommandObjectScript.cpp in Sources */,
         2689002413353DDE00698AC0 /* CommandObjectSettings.cpp in Sources */,
         2689002513353DDE00698AC0 /* CommandObjectSource.cpp in Sources */,
         267A48011B1411E40021A5BC /* XML.cpp in Sources */,
         AF8AD6371BEC28C400150209 /* PlatformRemoteAppleTV.cpp in Sources */,
         6D0F614E1C80AB0700A4ECEE /* JavaLanguageRuntime.cpp in Sources */,
         2666ADC61B3CB675001FAFD3 /* DynamicLoaderHexagonDYLD.cpp in Sources */,
         3F8169331ABB7A6D001DA9DF /* SystemLifetimeManager.cpp in Sources */,
2689FFC613353D7A00698AC0 /* Sources */ = {
         3F81691A1ABA2419001DA9DF /* NameMatches.cpp in Sources */,
         94B9E5121BBF20F4000A48DC /* NSString.cpp in Sources */,
         AF0E22F018A09FB20009B7D1 /* AppleGetItemInfoHandler.cpp in Sources */,
         AE44FB301BB07EB20033EB62 /* GoUserExpression.cpp in Sources */,
         2689004F13353E0400698AC0 /* StreamFile.cpp in Sources */,
         2689005113353E0400698AC0 /* StringList.cpp in Sources */,
         2689005213353E0400698AC0 /* Timer.cpp in Sources */,
         2689005413353E0400698AC0 /* UserSettingsController.cpp in Sources */,
+        2619C4852107A9A2009CDE81 /* RegisterContextMinidump_ARM.cpp in Sources */,
         23059A0719532B96007B8189 /* LinuxSignals.cpp in Sources */,
         8CCB017E19BA28A80009FD44 /* ThreadCollection.cpp in Sources */,
         9A77AD541E64E2760025CE04 /* RegisterInfoPOSIX_arm.cpp in Sources */,
         2689005613353E0400698AC0 /* Value.cpp in Sources */,
         26764CA21E48F547008D3573 /* StreamString.cpp in Sources */,
         2689005713353E0400698AC0 /* ValueObject.cpp in Sources */,
         3F8169321ABB7A6D001DA9DF /* SystemInitializerCommon.cpp in Sources */,
         2689005813353E0400698AC0 /* ValueObjectChild.cpp in Sources */,
2689FFC613353D7A00698AC0 /* Sources */ = {
         267C012B136880DF006E963E /* OptionGroupValueObjectDisplay.cpp in Sources */,
         49CA96FE1E6AACC900C03FEE /* DataEncoder.cpp in Sources */,
         26BCFC521368AE38006DC050 /* OptionGroupFormat.cpp in Sources */,
         2654A6901E552ED500DA1013 /* VASprintf.cpp in Sources */,
         AF81DEFA1828A23F0042CF19 /* SystemRuntime.cpp in Sources */,
         267C01371368C49C006E963E /* OptionGroupOutputFile.cpp in Sources */,
         260E07C6136FA69E00CF21D3 /* OptionGroupUUID.cpp in Sources */,
         AFC2DCF91E6E318000283714 /* StreamGDBRemote.cpp in Sources */,
+        2619C4892107ABD4009CDE81 /* DumpRegisterValue.cpp in Sources */,
         260E07C8136FAB9200CF21D3 /* OptionGroupFile.cpp in Sources */,
         2686536C1370ACB200D186A3 /* OptionGroupBoolean.cpp in Sources */,
         268653701370AE7200D186A3 /* OptionGroupUInt64.cpp in Sources */,
         264A12FC1372522000875C42 /* EmulateInstructionARM64.cpp in Sources */,
         26DB3E161379E7AD0080DC73 /* ABIMacOSX_arm.cpp in Sources */,
         26DB3E191379E7AD0080DC73 /* ABIMacOSX_arm64.cpp in Sources */,
         2374D7531D4BB2FF005C9575 /* GDBRemoteClientBase.cpp in Sources */,
         8C2D6A5E197A250F006989C9 /* MemoryHistoryASan.cpp in Sources */,

packages/Python/lldbsuite/test/functionalities/postmortem/minidump-new/TestMiniDumpNew.py

def test_snapshot_minidump(self):
         self.process = self.target.LoadCore("linux-x86_64_not_crashed.dmp")
         self.check_state()
         self.assertEqual(self.process.GetNumThreads(), 1)
         thread = self.process.GetThreadAtIndex(0)
         self.assertEqual(thread.GetStopReason(), lldb.eStopReasonNone)
         stop_description = thread.GetStopDescription(256)
         self.assertEqual(stop_description, "")
 
+    def check_register_unsigned(self, set, name, expected):
+        reg_value = set.GetChildMemberWithName(name)
+        self.assertTrue(reg_value.IsValid(),
+                        'Verify we have a register named "%s"' % (name))
+        self.assertEqual(reg_value.GetValueAsUnsigned(), expected,
+                         'Verify "%s" == %i' % (name, expected))
+
+    def check_register_string_value(self, set, name, expected, format):
+        reg_value = set.GetChildMemberWithName(name)
+        self.assertTrue(reg_value.IsValid(),
+                        'Verify we have a register named "%s"' % (name))
+        if format is not None:
+            reg_value.SetFormat(format)
+        self.assertEqual(reg_value.GetValue(), expected,
+                         'Verify "%s" has string value "%s"' % (name,
+                                                                expected))
+
+    def test_arm64_registers(self):
+        """Test ARM64 registers from a breakpad created minidump."""
+        # target create -c arm64-macos.dmp
+        self.dbg.CreateTarget(None)
+        self.target = self.dbg.GetSelectedTarget()
+        self.process = self.target.LoadCore("arm64-macos.dmp")
+        self.check_state()
+        self.assertEqual(self.process.GetNumThreads(), 1)
+        thread = self.process.GetThreadAtIndex(0)
+        self.assertEqual(thread.GetStopReason(), lldb.eStopReasonNone)
+        stop_description = thread.GetStopDescription(256)
+        self.assertEqual(stop_description, "")
+        registers = thread.GetFrameAtIndex(0).GetRegisters()
+        # Verify the GPR registers are all correct
+        # Verify x0 - x31 register values
+        gpr = registers.GetValueAtIndex(0)
+        for i in range(32):
+            v = i+1 | i+2 << 32 | i+3 << 48
+            w = i+1
+            self.check_register_unsigned(gpr, 'x%i' % (i), v)
+            self.check_register_unsigned(gpr, 'w%i' % (i), w)
+        # Verify arg1 - arg8 register values
+        for i in range(1, 9):
+            v = i | i+1 << 32 | i+2 << 48
+            self.check_register_unsigned(gpr, 'arg%i' % (i), v)
+        i = 29
+        v = i+1 | i+2 << 32 | i+3 << 48
+        self.check_register_unsigned(gpr, 'fp', v)
+        i = 30
+        v = i+1 | i+2 << 32 | i+3 << 48
+        self.check_register_unsigned(gpr, 'lr', v)
+        i = 31
+        v = i+1 | i+2 << 32 | i+3 << 48
+        self.check_register_unsigned(gpr, 'sp', v)
+        self.check_register_unsigned(gpr, 'pc', 0x1000)
+        self.check_register_unsigned(gpr, 'cpsr', 0x11223344)
+        self.check_register_unsigned(gpr, 'psr', 0x11223344)
+
+        # Verify the FPR registers are all correct
+        fpr = registers.GetValueAtIndex(1)
+        for i in range(32):
+            v = "0x"
+            d = "0x"
+            s = "0x"
+            h = "0x"
+            for j in range(i+15, i-1, -1):
+                v += "%2.2x" % (j)
+            for j in range(i+7, i-1, -1):
+                d += "%2.2x" % (j)
+            for j in range(i+3, i-1, -1):
+                s += "%2.2x" % (j)
+            for j in range(i+1, i-1, -1):
+                h += "%2.2x" % (j)
+            self.check_register_string_value(fpr, "v%i" % (i), v,
+                                             lldb.eFormatHex)
+            self.check_register_string_value(fpr, "d%i" % (i), d,
+                                             lldb.eFormatHex)
+            self.check_register_string_value(fpr, "s%i" % (i), s,
+                                             lldb.eFormatHex)
+            self.check_register_string_value(fpr, "h%i" % (i), h,
+                                             lldb.eFormatHex)
+        self.check_register_unsigned(gpr, 'fpsr', 0x55667788)
+        self.check_register_unsigned(gpr, 'fpcr', 0x99aabbcc)
+
+    def verify_arm_registers(self, apple=False):
+        """
+            Verify values of all ARM registers from a breakpad created
+            minidump.
+        """
+        self.dbg.CreateTarget(None)
+        self.target = self.dbg.GetSelectedTarget()
+        if apple:
+            self.process = self.target.LoadCore("arm-macos.dmp")
+        else:
+            self.process = self.target.LoadCore("arm-linux.dmp")
+        self.check_state()
+        self.assertEqual(self.process.GetNumThreads(), 1)
+        thread = self.process.GetThreadAtIndex(0)
+        self.assertEqual(thread.GetStopReason(), lldb.eStopReasonNone)
+        stop_description = thread.GetStopDescription(256)
+        self.assertEqual(stop_description, "")
+        registers = thread.GetFrameAtIndex(0).GetRegisters()
+        # Verify the GPR registers are all correct
+        # Verify x0 - x31 register values
+        gpr = registers.GetValueAtIndex(0)
+        for i in range(1, 16):
+            self.check_register_unsigned(gpr, 'r%i' % (i), i+1)
+        # Verify arg1 - arg4 register values
+        for i in range(1, 5):
+            self.check_register_unsigned(gpr, 'arg%i' % (i), i)
+        if apple:
+            self.check_register_unsigned(gpr, 'fp', 0x08)
+        else:
+            self.check_register_unsigned(gpr, 'fp', 0x0c)
+        self.check_register_unsigned(gpr, 'lr', 0x0f)
+        self.check_register_unsigned(gpr, 'sp', 0x0e)
+        self.check_register_unsigned(gpr, 'pc', 0x10)
+        self.check_register_unsigned(gpr, 'cpsr', 0x11223344)
+
+        # Verify the FPR registers are all correct
+        fpr = registers.GetValueAtIndex(1)
+        # Check d0 - d31
+        self.check_register_unsigned(gpr, 'fpscr', 0x55667788aabbccdd)
+        for i in range(32):
+            value = (i+1) | (i+1) << 8 | (i+1) << 32 | (i+1) << 48
+            self.check_register_unsigned(fpr, "d%i" % (i), value)
+        # Check s0 - s31
+        for i in range(32):
+            i_val = (i >> 1) + 1
+            if i & 1:
+                value = "%#8.8x" % (i_val | i_val << 16)
+            else:
+                value = "%#8.8x" % (i_val | i_val << 8)
+            self.check_register_string_value(fpr, "s%i" % (i), value,
+                                             lldb.eFormatHex)
+        # Check q0 - q15
+        for i in range(15):
+            a = i * 2 + 1
+            b = a + 1
+            value = ("0x00%2.2x00%2.2x0000%2.2x%2.2x"
+                     "00%2.2x00%2.2x0000%2.2x%2.2x") % (b, b, b, b, a, a, a, a)
+            self.check_register_string_value(fpr, "q%i" % (i), value,
+                                             lldb.eFormatHex)
+
+    def test_linux_arm_registers(self):
+        """Test Linux ARM registers from a breakpad created minidump.
+
+           The frame pointer is R11 for linux.
+        """
+        self.verify_arm_registers(apple=False)
+
+    def test_apple_arm_registers(self):
+        """Test Apple ARM registers from a breakpad created minidump.
+
+           The frame pointer is R7 for linux.
+        """
+        self.verify_arm_registers(apple=True)
+
     def do_test_deeper_stack(self, binary, core, pid):
         target = self.dbg.CreateTarget(binary)
         process = target.LoadCore(core)
         thread = process.GetThreadAtIndex(0)
 
         self.assertEqual(process.GetProcessID(), pid)
 
         expected_stack = {1: 'bar', 2: 'foo', 3: '_start'}

source/Plugins/Process/minidump/MinidumpParser.h

public:
   Status Initialize();
 
 private:
   MinidumpParser(const lldb::DataBufferSP &data_buf_sp);
 
 private:
   lldb::DataBufferSP m_data_sp;
   llvm::DenseMap<uint32_t, MinidumpLocationDescriptor> m_directory_map;
+  ArchSpec m_arch;
 };
 
 } // end namespace minidump
 } // end namespace lldb_private
 #endif // liblldb_MinidumpParser_h_

source/Plugins/Process/minidump/MinidumpParser.cpp

const MinidumpSystemInfo *MinidumpParser::GetSystemInfo() {
   llvm::ArrayRef<uint8_t> data = GetStream(MinidumpStreamType::SystemInfo);
 
   if (data.size() == 0)
     return nullptr;
 
   return MinidumpSystemInfo::Parse(data);
 }
 
 ArchSpec MinidumpParser::GetArchitecture() {
-  ArchSpec arch_spec;
-  const MinidumpSystemInfo *system_info = GetSystemInfo();
-
-  if (!system_info)
-    return arch_spec;
-
-  // TODO what to do about big endiand flavors of arm ?
-  // TODO set the arm subarch stuff if the minidump has info about it
-
-  llvm::Triple triple;
-  triple.setVendor(llvm::Triple::VendorType::UnknownVendor);
-
-  const MinidumpCPUArchitecture arch =
-      static_cast<const MinidumpCPUArchitecture>(
-          static_cast<const uint32_t>(system_info->processor_arch));
-
-  switch (arch) {
-  case MinidumpCPUArchitecture::X86:
-    triple.setArch(llvm::Triple::ArchType::x86);
-    break;
-  case MinidumpCPUArchitecture::AMD64:
-    triple.setArch(llvm::Triple::ArchType::x86_64);
-    break;
-  case MinidumpCPUArchitecture::ARM:
-    triple.setArch(llvm::Triple::ArchType::arm);
-    break;
-  case MinidumpCPUArchitecture::ARM64:
-    triple.setArch(llvm::Triple::ArchType::aarch64);
-    break;
-  default:
-    triple.setArch(llvm::Triple::ArchType::UnknownArch);
-    break;
-  }
-
-  const MinidumpOSPlatform os = static_cast<const MinidumpOSPlatform>(
-      static_cast<const uint32_t>(system_info->platform_id));
-
-  // TODO add all of the OSes that Minidump/breakpad distinguishes?
-  switch (os) {
-  case MinidumpOSPlatform::Win32S:
-  case MinidumpOSPlatform::Win32Windows:
-  case MinidumpOSPlatform::Win32NT:
-  case MinidumpOSPlatform::Win32CE:
-    triple.setOS(llvm::Triple::OSType::Win32);
-    break;
-  case MinidumpOSPlatform::Linux:
-    triple.setOS(llvm::Triple::OSType::Linux);
-    break;
-  case MinidumpOSPlatform::MacOSX:
-    triple.setOS(llvm::Triple::OSType::MacOSX);
-    break;
-  case MinidumpOSPlatform::Android:
-    triple.setOS(llvm::Triple::OSType::Linux);
-    triple.setEnvironment(llvm::Triple::EnvironmentType::Android);
-    break;
-  default:
-    triple.setOS(llvm::Triple::OSType::UnknownOS);
-    break;
-  }
-
-  arch_spec.SetTriple(triple);
-
-  return arch_spec;
+  return m_arch;
 }
 
 const MinidumpMiscInfo *MinidumpParser::GetMiscInfo() {
   llvm::ArrayRef<uint8_t> data = GetStream(MinidumpStreamType::MiscInfo);
 
   if (data.size() == 0)
     return nullptr;
 
   return MinidumpMiscInfo::Parse(data);
 }
 
 llvm::Optional<LinuxProcStatus> MinidumpParser::GetLinuxProcStatus() {
   llvm::ArrayRef<uint8_t> data = GetStream(MinidumpStreamType::LinuxProcStatus);
Status MinidumpParser::Initialize() {
 
   // Check for streams past the end of file
   const auto &last_range = minidump_map.back();
   if (last_range.end() > file_size) {
     error.SetErrorString("invalid minidump: truncated stream");
     return error;
   }
 
+  // Set the architecture in m_arch
+  const MinidumpSystemInfo *system_info = GetSystemInfo();
+  
+  if (!system_info)
+    return error;
+  
+  // TODO what to do about big endiand flavors of arm ?
+  // TODO set the arm subarch stuff if the minidump has info about it
+  
+  llvm::Triple triple;
+  triple.setVendor(llvm::Triple::VendorType::UnknownVendor);
+  
+  const MinidumpCPUArchitecture arch =
+    static_cast<const MinidumpCPUArchitecture>(
+        static_cast<const uint32_t>(system_info->processor_arch));
+  
+  switch (arch) {
+    case MinidumpCPUArchitecture::X86:
+      triple.setArch(llvm::Triple::ArchType::x86);
+      break;
+    case MinidumpCPUArchitecture::AMD64:
+      triple.setArch(llvm::Triple::ArchType::x86_64);
+      break;
+    case MinidumpCPUArchitecture::ARM:
+      triple.setArch(llvm::Triple::ArchType::arm);
+      break;
+    case MinidumpCPUArchitecture::ARM64:
+      triple.setArch(llvm::Triple::ArchType::aarch64);
+      break;
+    default:
+      triple.setArch(llvm::Triple::ArchType::UnknownArch);
+      break;
+  }
+  
+  const MinidumpOSPlatform os = static_cast<const MinidumpOSPlatform>(
+      static_cast<const uint32_t>(system_info->platform_id));
+  
+  // TODO add all of the OSes that Minidump/breakpad distinguishes?
+  switch (os) {
+    case MinidumpOSPlatform::Win32S:
+    case MinidumpOSPlatform::Win32Windows:
+    case MinidumpOSPlatform::Win32NT:
+    case MinidumpOSPlatform::Win32CE:
+      triple.setOS(llvm::Triple::OSType::Win32);
+      break;
+    case MinidumpOSPlatform::Linux:
+      triple.setOS(llvm::Triple::OSType::Linux);
+      break;
+    case MinidumpOSPlatform::MacOSX:
+      triple.setOS(llvm::Triple::OSType::MacOSX);
+      triple.setVendor(llvm::Triple::Apple);
+      break;
+    case MinidumpOSPlatform::IOS:
+      triple.setOS(llvm::Triple::OSType::IOS);
+      triple.setVendor(llvm::Triple::Apple);
+      break;
+    case MinidumpOSPlatform::Android:
+      triple.setOS(llvm::Triple::OSType::Linux);
+      triple.setEnvironment(llvm::Triple::EnvironmentType::Android);
+      break;
+    default: {
+      triple.setOS(llvm::Triple::OSType::UnknownOS);
+      std::string csd_version;
+      if (auto s = GetMinidumpString(system_info->csd_version_rva))
+        csd_version = *s;
+      if (csd_version.find("Linux") != std::string::npos)
+        triple.setOS(llvm::Triple::OSType::Linux);
+      break;
+    }
+  }
+  m_arch.SetTriple(triple);
+
   return error;
 }

source/Plugins/Process/minidump/ProcessMinidump.cpp

 //===-- ProcessMinidump.cpp -------------------------------------*- C++ -*-===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 
 // Project includes
 #include "ProcessMinidump.h"
 #include "ThreadMinidump.h"
 
 // Other libraries and framework includes
+//#include "lldb/Core/Architecture.h"
 #include "lldb/Core/Module.h"
 #include "lldb/Core/ModuleSpec.h"
 #include "lldb/Core/PluginManager.h"
 #include "lldb/Core/Section.h"
 #include "lldb/Core/State.h"
 #include "lldb/Target/DynamicLoader.h"
 #include "lldb/Target/MemoryRegionInfo.h"
 #include "lldb/Target/SectionLoadList.h"
 #include "lldb/Target/Target.h"
 #include "lldb/Target/UnixSignals.h"
 #include "lldb/Utility/DataBufferLLVM.h"
 #include "lldb/Utility/LLDBAssert.h"
 #include "lldb/Utility/Log.h"
 
 #include "llvm/Support/MemoryBuffer.h"
 #include "llvm/Support/Threading.h"
 
+#include "Plugins/Process/Utility/StopInfoMachException.h"
 // C includes
 // C++ includes
 
 using namespace lldb;
 using namespace lldb_private;
 using namespace minidump;
 
 //------------------------------------------------------------------
Status ProcessMinidump::DoLoadCore() {
   if (error.Fail())
     return error;
 
   // Do we support the minidump's architecture?
   ArchSpec arch = GetArchitecture();
   switch (arch.GetMachine()) {
   case llvm::Triple::x86:
   case llvm::Triple::x86_64:
-    // supported
+  case llvm::Triple::arm:
+  case llvm::Triple::aarch64:
+    // Any supported architectures must be listed here and also supported in
+    // ThreadMinidump::CreateRegisterContextForFrame().
     break;
-
   default:
     error.SetErrorStringWithFormat("unsupported minidump architecture: %s",
                                    arch.GetArchitectureName());
     return error;
   }
+  GetTarget().SetArchitecture(arch, true /*set_platform*/);
 
   m_thread_list = m_minidump_parser.GetThreads();
   m_active_exception = m_minidump_parser.GetExceptionStream();
   ReadModuleList();
-  GetTarget().SetArchitecture(arch);
 
   llvm::Optional<lldb::pid_t> pid = m_minidump_parser.GetPid();
   if (!pid) {
     error.SetErrorString("failed to parse PID");
     return error;
   }
   SetID(pid.getValue());
 
void ProcessMinidump::RefreshStateAfterStop() {
 
   Process::m_thread_list.SetSelectedThreadByID(m_active_exception->thread_id);
   stop_thread = Process::m_thread_list.GetSelectedThread();
   ArchSpec arch = GetArchitecture();
 
   if (arch.GetTriple().getOS() == llvm::Triple::Linux) {
     stop_info = StopInfo::CreateStopReasonWithSignal(
         *stop_thread, m_active_exception->exception_record.exception_code);
+  } else if (arch.GetTriple().getVendor() == llvm::Triple::Apple) {
+    stop_info = StopInfoMachException::CreateStopReasonWithMachException(
+        *stop_thread,
+        m_active_exception->exception_record.exception_code, 2,
+        m_active_exception->exception_record.exception_flags,
+        m_active_exception->exception_record.exception_address, 0);
   } else {
     std::string desc;
     llvm::raw_string_ostream desc_stream(desc);
     desc_stream << "Exception "
                 << llvm::format_hex(
                        m_active_exception->exception_record.exception_code, 8)
                 << " encountered at address "
                 << llvm::format_hex(

source/Plugins/Process/minidump/RegisterContextMinidump_ARM.h

+//===-- RegisterContextMinidump_ARM.h ---------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef liblldb_RegisterContextMinidump_ARM_h_
+#define liblldb_RegisterContextMinidump_ARM_h_
+
+// Project includes
+#include "MinidumpTypes.h"
+
+// Other libraries and framework includes
+#include "Plugins/Process/Utility/RegisterInfoInterface.h"
+
+#include "lldb/Target/RegisterContext.h"
+
+#include "llvm/ADT/ArrayRef.h"
+#include "llvm/ADT/BitmaskEnum.h"
+
+// C includes
+// C++ includes
+
+namespace lldb_private {
+
+namespace minidump {
+
+LLVM_ENABLE_BITMASK_ENUMS_IN_NAMESPACE();
+
+class RegisterContextMinidump_ARM: public lldb_private::RegisterContext {
+public:
+  RegisterContextMinidump_ARM(lldb_private::Thread &thread,
+                              const DataExtractor &data, bool apple);
+  
+  ~RegisterContextMinidump_ARM() override = default;
+  
+  void InvalidateAllRegisters() override {
+    // Do nothing... registers are always valid...
+  }
+  
+  size_t GetRegisterCount() override;
+
+  const lldb_private::RegisterInfo *GetRegisterInfoAtIndex(size_t reg) override;
+
+  size_t GetRegisterSetCount() override;
+  
+  const lldb_private::RegisterSet *GetRegisterSet(size_t set) override;
+  
+  const char *GetRegisterName(unsigned reg);
+  
+  bool ReadRegister(const RegisterInfo *reg_info,
+                    RegisterValue &reg_value) override;
+  
+  bool WriteRegister(const RegisterInfo *reg_info,
+                     const RegisterValue &reg_value) override;
+  
+
+  uint32_t ConvertRegisterKindToRegisterNumber(lldb::RegisterKind kind,
+                                               uint32_t num) override;
+
+  // Reference: see breakpad/crashpad source
+  struct QRegValue {
+    uint64_t lo;
+    uint64_t hi;
+  };
+
+  struct Context {
+    uint32_t context_flags;
+    uint32_t r[16];
+    uint32_t cpsr;
+    uint64_t fpscr;
+    union {
+      uint64_t d[32];
+      uint32_t s[32];
+      QRegValue q[16];
+    };
+    uint32_t extra[8];
+  };
+
+  protected:
+    enum class Flags : uint32_t {
+      ARM_Flag = 0x40000000,
+      Integer = ARM_Flag | 0x00000002,
+      FloatingPoint = ARM_Flag | 0x00000004,
+      LLVM_MARK_AS_BITMASK_ENUM(/* LargestValue = */ FloatingPoint)
+    };
+    Context m_regs;
+    const bool m_apple; // True if this is an Apple ARM where FP is R7
+};
+
+} // end namespace minidump
+} // end namespace lldb_private
+#endif // liblldb_RegisterContextMinidump_ARM_h_

source/Plugins/Process/minidump/RegisterContextMinidump_ARM.cpp

+//===-- RegisterContextMinidump_ARM.cpp -------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// Project includes
+#include "RegisterContextMinidump_ARM.h"
+
+// Other libraries and framework includes
+#include "lldb/lldb-enumerations.h"
+#include "lldb/Core/RegisterValue.h"
+#include "lldb/Utility/DataExtractor.h"
+#include "lldb/Utility/LLDBAssert.h"
+#include "Utility/ARM_DWARF_Registers.h"
+
+// C includes
+#include <assert.h>
+
+// C++ includes
+
+using namespace lldb;
+using namespace lldb_private;
+using namespace minidump;
+
+#define INV LLDB_INVALID_REGNUM
+#define OFFSET(r) (offsetof(RegisterContextMinidump_ARM::Context, r))
+
+#define DEF_R(i) {"r"#i, nullptr, 4, OFFSET(r[i]), eEncodingUint, eFormatHex, \
+                  {INV, dwarf_r##i, INV, INV, reg_r##i}, \
+                  nullptr, nullptr, nullptr, 0}
+
+#define DEF_R_ARG(i, n) {"r"#i, "arg"#n, 4, OFFSET(r[i]), eEncodingUint,\
+    eFormatHex, {INV, dwarf_r##i, LLDB_REGNUM_GENERIC_ARG1+i, INV, reg_r##i},\
+    nullptr, nullptr, nullptr, 0}
+
+#define DEF_D(i) {"d"#i, nullptr, 8, OFFSET(d[i]), eEncodingVector,\
+    eFormatVectorOfUInt8, {INV, dwarf_d##i, INV, INV, reg_d##i}, \
+    nullptr, nullptr, nullptr, 0}
+
+#define DEF_S(i) {"s"#i, nullptr, 4, OFFSET(s[i]), eEncodingIEEE754,\
+    eFormatFloat, {INV, dwarf_s##i, INV, INV, reg_s##i}, \
+    nullptr, nullptr, nullptr, 0}
+
+#define DEF_Q(i) {"q"#i, nullptr, 16, OFFSET(q[i]), eEncodingVector,\
+    eFormatVectorOfUInt8, {INV, dwarf_q##i, INV, INV, reg_q##i}, \
+    nullptr, nullptr, nullptr, 0}
+
+// Zero based LLDB register numbers for this register context
+enum {
+  // General Purpose Registers
+  reg_r0,  reg_r1,  reg_r2,  reg_r3,  reg_r4, reg_r5, reg_r6, reg_r7,
+  reg_r8,  reg_r9, reg_r10, reg_r11, reg_r12, reg_sp, reg_lr, reg_pc,
+  reg_cpsr,
+  // Floating Point Registers
+  reg_fpscr,
+  reg_d0,   reg_d1,  reg_d2,  reg_d3,  reg_d4,  reg_d5,  reg_d6,  reg_d7,
+  reg_d8,   reg_d9, reg_d10, reg_d11, reg_d12, reg_d13, reg_d14, reg_d15,
+  reg_d16, reg_d17, reg_d18, reg_d19, reg_d20, reg_d21, reg_d22, reg_d23,
+  reg_d24, reg_d25, reg_d26, reg_d27, reg_d28, reg_d29, reg_d30, reg_d31,
+  reg_s0,   reg_s1,  reg_s2,  reg_s3,  reg_s4,  reg_s5,  reg_s6,  reg_s7,
+  reg_s8,   reg_s9, reg_s10, reg_s11, reg_s12, reg_s13, reg_s14, reg_s15,
+  reg_s16, reg_s17, reg_s18, reg_s19, reg_s20, reg_s21, reg_s22, reg_s23,
+  reg_s24, reg_s25, reg_s26, reg_s27, reg_s28, reg_s29, reg_s30, reg_s31,
+  reg_q0,   reg_q1,  reg_q2,  reg_q3,  reg_q4,  reg_q5,  reg_q6,  reg_q7,
+  reg_q8,   reg_q9, reg_q10, reg_q11, reg_q12, reg_q13, reg_q14, reg_q15,
+  k_num_regs
+};
+
+static RegisterInfo g_reg_info_apple_fp = {"fp", "r7", 4, OFFSET(r[7]),
+  eEncodingUint, eFormatHex,
+  {INV, dwarf_r7, LLDB_REGNUM_GENERIC_FP, INV, reg_r7},
+  nullptr, nullptr, nullptr, 0};
+
+static RegisterInfo g_reg_info_fp = {"fp", "r11", 4, OFFSET(r[11]),
+  eEncodingUint, eFormatHex,
+  {INV, dwarf_r11, LLDB_REGNUM_GENERIC_FP, INV, reg_r11},
+  nullptr, nullptr, nullptr, 0};
+
+// Register info definitions for this register context
+static RegisterInfo g_reg_infos[] = {
+  DEF_R_ARG(0, 1),
+  DEF_R_ARG(1, 2),
+  DEF_R_ARG(2, 3),
+  DEF_R_ARG(3, 4),
+  DEF_R(4),
+  DEF_R(5),
+  DEF_R(6),
+  DEF_R(7),
+  DEF_R(8),
+  DEF_R(9),
+  DEF_R(10),
+  DEF_R(11),
+  DEF_R(12),
+  {"sp", "r13", 4, OFFSET(r[13]), eEncodingUint, eFormatHex,
+    {INV, dwarf_sp, LLDB_REGNUM_GENERIC_SP, INV, reg_sp},
+    nullptr, nullptr, nullptr, 0},
+  {"lr", "r14", 4, OFFSET(r[14]), eEncodingUint, eFormatHex,
+    {INV, dwarf_lr, LLDB_REGNUM_GENERIC_RA, INV, reg_lr},
+    nullptr, nullptr, nullptr, 0},
+  {"pc", "r15", 4, OFFSET(r[15]), eEncodingUint, eFormatHex,
+    {INV, dwarf_pc, LLDB_REGNUM_GENERIC_PC, INV, reg_pc},
+    nullptr, nullptr, nullptr, 0},
+  {"cpsr", "psr", 4, OFFSET(cpsr), eEncodingUint, eFormatHex,
+    {INV, dwarf_cpsr, LLDB_REGNUM_GENERIC_FLAGS, INV, reg_cpsr},
+    nullptr, nullptr, nullptr, 0},
+  {"fpscr", nullptr, 8, OFFSET(fpscr), eEncodingUint, eFormatHex,
+    {INV, INV, INV, INV, reg_fpscr},
+    nullptr, nullptr, nullptr, 0},
+  DEF_D(0) , DEF_D(1) , DEF_D(2) , DEF_D(3) , DEF_D(4) , DEF_D(5) , DEF_D(6),
+  DEF_D(7) , DEF_D(8) , DEF_D(9) , DEF_D(10), DEF_D(11), DEF_D(12), DEF_D(13),
+  DEF_D(14), DEF_D(15), DEF_D(16), DEF_D(17), DEF_D(18), DEF_D(19), DEF_D(20),
+  DEF_D(21), DEF_D(22), DEF_D(23), DEF_D(24), DEF_D(25), DEF_D(26), DEF_D(27),
+  DEF_D(28), DEF_D(29), DEF_D(30), DEF_D(31),
+  DEF_S(0) , DEF_S(1) , DEF_S(2) , DEF_S(3) , DEF_S(4) , DEF_S(5) , DEF_S(6),
+  DEF_S(7) , DEF_S(8) , DEF_S(9) , DEF_S(10), DEF_S(11), DEF_S(12), DEF_S(13),
+  DEF_S(14), DEF_S(15), DEF_S(16), DEF_S(17), DEF_S(18), DEF_S(19), DEF_S(20),
+  DEF_S(21), DEF_S(22), DEF_S(23), DEF_S(24), DEF_S(25), DEF_S(26), DEF_S(27),
+  DEF_S(28), DEF_S(29), DEF_S(30), DEF_S(31),
+  DEF_Q(0) , DEF_Q(1) , DEF_Q(2) , DEF_Q(3) , DEF_Q(4) , DEF_Q(5) , DEF_Q(6),
+  DEF_Q(7) , DEF_Q(8) , DEF_Q(9) , DEF_Q(10), DEF_Q(11), DEF_Q(12), DEF_Q(13),
+  DEF_Q(14), DEF_Q(15)
+};
+
+constexpr size_t k_num_reg_infos = llvm::array_lengthof(g_reg_infos);
+
+// ARM general purpose registers.
+const uint32_t g_gpr_regnums[] = {
+  reg_r0,  reg_r1,  reg_r2,  reg_r3,  reg_r4, reg_r5, reg_r6, reg_r7,
+  reg_r8,  reg_r9, reg_r10, reg_r11, reg_r12, reg_sp, reg_lr, reg_pc,
+  reg_cpsr,
+  LLDB_INVALID_REGNUM // register sets need to end with this flag
+};
+const uint32_t g_fpu_regnums[] = {
+  reg_fpscr,
+  reg_d0,   reg_d1,  reg_d2,  reg_d3,  reg_d4,  reg_d5,  reg_d6,  reg_d7,
+  reg_d8,   reg_d9, reg_d10, reg_d11, reg_d12, reg_d13, reg_d14, reg_d15,
+  reg_d16, reg_d17, reg_d18, reg_d19, reg_d20, reg_d21, reg_d22, reg_d23,
+  reg_d24, reg_d25, reg_d26, reg_d27, reg_d28, reg_d29, reg_d30, reg_d31,
+  reg_s0,   reg_s1,  reg_s2,  reg_s3,  reg_s4,  reg_s5,  reg_s6,  reg_s7,
+  reg_s8,   reg_s9, reg_s10, reg_s11, reg_s12, reg_s13, reg_s14, reg_s15,
+  reg_s16, reg_s17, reg_s18, reg_s19, reg_s20, reg_s21, reg_s22, reg_s23,
+  reg_s24, reg_s25, reg_s26, reg_s27, reg_s28, reg_s29, reg_s30, reg_s31,
+  reg_q0,   reg_q1,  reg_q2,  reg_q3,  reg_q4,  reg_q5,  reg_q6,  reg_q7,
+  reg_q8,   reg_q9, reg_q10, reg_q11, reg_q12, reg_q13, reg_q14, reg_q15,
+  LLDB_INVALID_REGNUM // register sets need to end with this flag
+};
+
+// Skip the last LLDB_INVALID_REGNUM in each count below by subtracting 1
+constexpr size_t k_num_gpr_regs = llvm::array_lengthof(g_gpr_regnums) - 1;
+constexpr size_t k_num_fpu_regs = llvm::array_lengthof(g_fpu_regnums) - 1;
+
+static RegisterSet g_reg_sets[] = {
+  { "General Purpose Registers", "gpr", k_num_gpr_regs, g_gpr_regnums },
+  { "Floating Point Registers", "fpu", k_num_fpu_regs, g_fpu_regnums },
+};
+
+constexpr size_t k_num_reg_sets = llvm::array_lengthof(g_reg_sets);
+
+RegisterContextMinidump_ARM::RegisterContextMinidump_ARM(Thread &thread,
+    const DataExtractor &data, bool apple) : RegisterContext(thread, 0),
+      m_apple(apple) {
+  lldb::offset_t offset = 0;
+  m_regs.context_flags = data.GetU32(&offset);
+  for (unsigned i=0; i<llvm::array_lengthof(m_regs.r); ++i)
+    m_regs.r[i] = data.GetU32(&offset);
+  m_regs.cpsr = data.GetU32(&offset);
+  m_regs.fpscr = data.GetU64(&offset);
+  for (unsigned i=0; i<llvm::array_lengthof(m_regs.d); ++i)
+    m_regs.d[i] = data.GetU64(&offset);
+  lldbassert(k_num_regs == k_num_reg_infos);
+}
+
+size_t RegisterContextMinidump_ARM::GetRegisterCount() {
+  return k_num_regs;
+}
+
+const RegisterInfo *
+RegisterContextMinidump_ARM::GetRegisterInfoAtIndex(size_t reg) {
+  if (reg < k_num_reg_infos) {
+    if (m_apple) {
+      if (reg == reg_r7)
+        return &g_reg_info_apple_fp;
+    } else {
+      if (reg == reg_r11)
+        return &g_reg_info_fp;
+    }
+    return &g_reg_infos[reg];
+  }
+  return nullptr;
+}
+
+size_t RegisterContextMinidump_ARM::GetRegisterSetCount()  {
+  return k_num_reg_sets;
+}
+
+const RegisterSet *RegisterContextMinidump_ARM::GetRegisterSet(size_t set) {
+  if (set < k_num_reg_sets)
+    return &g_reg_sets[set];
+  return nullptr;
+}
+
+const char *RegisterContextMinidump_ARM::GetRegisterName(unsigned reg) {
+  if (reg < k_num_reg_infos)
+    return g_reg_infos[reg].name;
+  return nullptr;
+}
+
+bool RegisterContextMinidump_ARM::ReadRegister(
+    const RegisterInfo *reg_info, RegisterValue &reg_value) {
+  Status error;
+  reg_value.SetFromMemoryData(reg_info,
+                              (const uint8_t *)&m_regs + reg_info->byte_offset,
+                              reg_info->byte_size, lldb::eByteOrderLittle,
+                              error);
+  return error.Success();
+}
+
+bool RegisterContextMinidump_ARM::WriteRegister(
+    const RegisterInfo *, const RegisterValue &) {
+  return false;
+}
+
+uint32_t RegisterContextMinidump_ARM::ConvertRegisterKindToRegisterNumber(
+    lldb::RegisterKind kind, uint32_t num) {
+  for (size_t i=0; i<k_num_regs; ++i) {
+    if (g_reg_infos[i].kinds[kind] == num)
+      return i;
+  }
+  return LLDB_INVALID_REGNUM;
+}

source/Plugins/Process/minidump/RegisterContextMinidump_ARM64.h

+//===-- RegisterContextMinidump_ARM64.h -------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef liblldb_RegisterContextMinidump_ARM64_h_
+#define liblldb_RegisterContextMinidump_ARM64_h_
+
+// Project includes
+#include "MinidumpTypes.h"
+
+// Other libraries and framework includes
+#include "Plugins/Process/Utility/RegisterInfoInterface.h"
+#include "lldb/Target/RegisterContext.h"
+
+#include "llvm/ADT/ArrayRef.h"
+#include "llvm/ADT/BitmaskEnum.h"
+
+// C includes
+// C++ includes
+
+namespace lldb_private {
+
+namespace minidump {
+
+LLVM_ENABLE_BITMASK_ENUMS_IN_NAMESPACE();
+
+class RegisterContextMinidump_ARM64: public lldb_private::RegisterContext {
+public:
+  RegisterContextMinidump_ARM64(lldb_private::Thread &thread,
+                               const DataExtractor &data);
+  
+  ~RegisterContextMinidump_ARM64() override = default;
+  
+  void InvalidateAllRegisters() override {
+    // Do nothing... registers are always valid...
+  }
+  
+  size_t GetRegisterCount() override;
+
+  const lldb_private::RegisterInfo *GetRegisterInfoAtIndex(size_t reg) override;
+
+  size_t GetRegisterSetCount() override;
+  
+  const lldb_private::RegisterSet *GetRegisterSet(size_t set) override;
+  
+  const char *GetRegisterName(unsigned reg);
+  
+  bool ReadRegister(const RegisterInfo *reg_info,
+                    RegisterValue &reg_value) override;
+  
+  bool WriteRegister(const RegisterInfo *reg_info,
+                     const RegisterValue &reg_value) override;
+  
+
+  uint32_t ConvertRegisterKindToRegisterNumber(lldb::RegisterKind kind,
+                                               uint32_t num) override;
+
+  // Reference: see breakpad/crashpad source
+  struct Context {
+    uint64_t context_flags;
+    uint64_t x[32];
+    uint64_t pc;
+    uint32_t cpsr;
+    uint32_t fpsr;
+    uint32_t fpcr;
+    uint8_t v[32 * 16]; // 32 128-bit floating point registers
+  };
+
+  protected:
+    enum class Flags : uint32_t {
+      ARM64_Flag = 0x80000000,
+      Integer = ARM64_Flag | 0x00000002,
+      FloatingPoint = ARM64_Flag | 0x00000004,
+      LLVM_MARK_AS_BITMASK_ENUM(/* LargestValue = */ FloatingPoint)
+    };
+    Context m_regs;
+};
+
+} // end namespace minidump
+} // end namespace lldb_private
+#endif // liblldb_RegisterContextMinidump_ARM64_h_

source/Plugins/Process/minidump/RegisterContextMinidump_ARM64.cpp

+//===-- RegisterContextMinidump_ARM64.cpp -----------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// Project includes
+#include "RegisterContextMinidump_ARM64.h"
+
+// Other libraries and framework includes
+#include "lldb/lldb-enumerations.h"
+#include "lldb/Core/RegisterValue.h"
+#include "lldb/Utility/DataExtractor.h"
+#include "Utility/ARM64_DWARF_Registers.h"
+
+// C includes
+#include <assert.h>
+
+// C++ includes
+
+using namespace lldb;
+using namespace lldb_private;
+using namespace minidump;
+
+#define INV LLDB_INVALID_REGNUM
+#define OFFSET(r) (offsetof(RegisterContextMinidump_ARM64::Context, r))
+
+#define DEF_X(i) {"x"#i, nullptr, 8, OFFSET(x[i]), eEncodingUint, eFormatHex, \
+    {INV, arm64_dwarf::x##i, INV, INV, reg_x##i}, nullptr, nullptr, nullptr, 0}
+
+#define DEF_W(i) {"w"#i, nullptr, 4, OFFSET(x[i]), eEncodingUint, eFormatHex, \
+    {INV, INV, INV, INV, reg_w##i}, nullptr, nullptr, nullptr, 0}
+
+#define DEF_X_ARG(i, n) {"x"#i, "arg"#n, 8, OFFSET(x[i]), eEncodingUint,\
+    eFormatHex, {INV, arm64_dwarf::x##i, LLDB_REGNUM_GENERIC_ARG1+i, INV, reg_x##i},\
+    nullptr, nullptr, nullptr, 0}
+
+#define DEF_V(i) {"v"#i, nullptr, 16, OFFSET(v[i*16]), eEncodingVector,\
+    eFormatVectorOfUInt8, {INV, arm64_dwarf::v##i, INV, INV, reg_v##i}, \
+    nullptr, nullptr, nullptr, 0}
+
+#define DEF_D(i) {"d"#i, nullptr, 8, OFFSET(v[i*16]), eEncodingVector,\
+    eFormatVectorOfUInt8, {INV, INV, INV, INV, reg_d##i}, \
+    nullptr, nullptr, nullptr, 0}
+
+#define DEF_S(i) {"s"#i, nullptr, 4, OFFSET(v[i*16]), eEncodingVector,\
+    eFormatVectorOfUInt8, {INV, INV, INV, INV, reg_s##i}, \
+    nullptr, nullptr, nullptr, 0}
+
+
+#define DEF_H(i) {"h"#i, nullptr, 2, OFFSET(v[i*16]), eEncodingVector,\
+    eFormatVectorOfUInt8, {INV, INV, INV, INV, reg_h##i}, \
+    nullptr, nullptr, nullptr, 0}
+
+// Zero based LLDB register numbers for this register context
+enum {
+  // General Purpose Registers
+  reg_x0=0, reg_x1, reg_x2, reg_x3, reg_x4, reg_x5, reg_x6, reg_x7,
+  reg_x8, reg_x9, reg_x10, reg_x11, reg_x12, reg_x13, reg_x14, reg_x15,
+  reg_x16, reg_x17, reg_x18, reg_x19, reg_x20, reg_x21, reg_x22, reg_x23,
+  reg_x24, reg_x25, reg_x26, reg_x27, reg_x28, reg_fp , reg_lr, reg_sp,
+  reg_pc,
+  reg_w0, reg_w1, reg_w2, reg_w3, reg_w4, reg_w5, reg_w6, reg_w7,
+  reg_w8, reg_w9, reg_w10, reg_w11, reg_w12, reg_w13, reg_w14, reg_w15,
+  reg_w16, reg_w17, reg_w18, reg_w19, reg_w20, reg_w21, reg_w22, reg_w23,
+  reg_w24, reg_w25, reg_w26, reg_w27, reg_w28, reg_w29, reg_w30, reg_w31,
+  reg_cpsr,
+  // Floating Point Registers
+  reg_fpsr, reg_fpcr,
+  reg_v0 , reg_v1 , reg_v2 , reg_v3 , reg_v4 , reg_v5 , reg_v6 , reg_v7 ,
+  reg_v8 , reg_v9 , reg_v10, reg_v11, reg_v12, reg_v13, reg_v14, reg_v15,
+  reg_v16, reg_v17, reg_v18, reg_v19, reg_v20, reg_v21, reg_v22, reg_v23,
+  reg_v24, reg_v25, reg_v26, reg_v27, reg_v28, reg_v29, reg_v30, reg_v31,
+  reg_d0 , reg_d1 , reg_d2 , reg_d3 , reg_d4 , reg_d5 , reg_d6 , reg_d7 ,
+  reg_d8 , reg_d9 , reg_d10, reg_d11, reg_d12, reg_d13, reg_d14, reg_d15,
+  reg_d16, reg_d17, reg_d18, reg_d19, reg_d20, reg_d21, reg_d22, reg_d23,
+  reg_d24, reg_d25, reg_d26, reg_d27, reg_d28, reg_d29, reg_d30, reg_d31,
+  reg_s0 , reg_s1 , reg_s2 , reg_s3 , reg_s4 , reg_s5 , reg_s6 , reg_s7 ,
+  reg_s8 , reg_s9 , reg_s10, reg_s11, reg_s12, reg_s13, reg_s14, reg_s15,
+  reg_s16, reg_s17, reg_s18, reg_s19, reg_s20, reg_s21, reg_s22, reg_s23,
+  reg_s24, reg_s25, reg_s26, reg_s27, reg_s28, reg_s29, reg_s30, reg_s31,
+  reg_h0 , reg_h1 , reg_h2 , reg_h3 , reg_h4 , reg_h5 , reg_h6 , reg_h7 ,
+  reg_h8 , reg_h9 , reg_h10, reg_h11, reg_h12, reg_h13, reg_h14, reg_h15,
+  reg_h16, reg_h17, reg_h18, reg_h19, reg_h20, reg_h21, reg_h22, reg_h23,
+  reg_h24, reg_h25, reg_h26, reg_h27, reg_h28, reg_h29, reg_h30, reg_h31,
+  k_num_regs
+};
+
+// Register info definitions for this register context
+static RegisterInfo g_reg_infos[] = {
+  DEF_X_ARG(0, 1), DEF_X_ARG(1, 2), DEF_X_ARG(2, 3), DEF_X_ARG(3, 4),
+  DEF_X_ARG(4, 5), DEF_X_ARG(5, 6), DEF_X_ARG(6, 7), DEF_X_ARG(7, 8),
+  DEF_X(8) , DEF_X(9) , DEF_X(10), DEF_X(11),
+  DEF_X(12), DEF_X(13), DEF_X(14), DEF_X(15),
+  DEF_X(16), DEF_X(17), DEF_X(18), DEF_X(19),
+  DEF_X(20), DEF_X(21), DEF_X(22), DEF_X(23),
+  DEF_X(24), DEF_X(25), DEF_X(26), DEF_X(27),
+  DEF_X(28),
+  {"fp", "x29", 8, OFFSET(x[29]), eEncodingUint, eFormatHex,
+    {INV, arm64_dwarf::x29, LLDB_REGNUM_GENERIC_FP, INV, reg_fp},
+    nullptr, nullptr, nullptr, 0},
+  {"lr", "x30", 8, OFFSET(x[30]), eEncodingUint, eFormatHex,
+    {INV, arm64_dwarf::x30, LLDB_REGNUM_GENERIC_RA, INV, reg_lr},
+    nullptr, nullptr, nullptr, 0},
+  {"sp", "x31", 8, OFFSET(x[31]), eEncodingUint, eFormatHex,
+    {INV, arm64_dwarf::x31, LLDB_REGNUM_GENERIC_SP, INV, reg_sp},
+    nullptr, nullptr, nullptr, 0},
+  {"pc", nullptr, 8, OFFSET(pc), eEncodingUint, eFormatHex,
+    {INV, arm64_dwarf::pc, LLDB_REGNUM_GENERIC_PC, INV, reg_pc},
+    nullptr, nullptr, nullptr, 0},
+  // w0 - w31
+  DEF_W(0) , DEF_W(1) , DEF_W(2) , DEF_W(3) ,
+  DEF_W(4) , DEF_W(5) , DEF_W(6) , DEF_W(7) ,
+  DEF_W(8) , DEF_W(9) , DEF_W(10), DEF_W(11),
+  DEF_W(12), DEF_W(13), DEF_W(14), DEF_W(15),
+  DEF_W(16), DEF_W(17), DEF_W(18), DEF_W(19),
+  DEF_W(20), DEF_W(21), DEF_W(22), DEF_W(23),
+  DEF_W(24), DEF_W(25), DEF_W(26), DEF_W(27),
+  DEF_W(28), DEF_W(29), DEF_W(30), DEF_W(31),
+  {"cpsr", "psr", 4, OFFSET(cpsr), eEncodingUint, eFormatHex,
+    {INV, arm64_dwarf::cpsr, LLDB_REGNUM_GENERIC_FLAGS, INV, reg_cpsr},
+    nullptr, nullptr, nullptr, 0},
+  {"fpsr", nullptr, 4, OFFSET(fpsr), eEncodingUint, eFormatHex,
+    {INV, INV, INV, INV, reg_fpsr},
+    nullptr, nullptr, nullptr, 0},
+  {"fpcr", nullptr, 4, OFFSET(fpcr), eEncodingUint, eFormatHex,
+    {INV, INV, INV, INV, reg_fpcr},
+    nullptr, nullptr, nullptr, 0},
+  // v0 - v31
+  DEF_V(0) , DEF_V(1) , DEF_V(2) , DEF_V(3) ,
+  DEF_V(4) , DEF_V(5) , DEF_V(6) , DEF_V(7) ,
+  DEF_V(8) , DEF_V(9) , DEF_V(10), DEF_V(11),
+  DEF_V(12), DEF_V(13), DEF_V(14), DEF_V(15),
+  DEF_V(16), DEF_V(17), DEF_V(18), DEF_V(19),
+  DEF_V(20), DEF_V(21), DEF_V(22), DEF_V(23),
+  DEF_V(24), DEF_V(25), DEF_V(26), DEF_V(27),
+  DEF_V(28), DEF_V(29), DEF_V(30), DEF_V(31),
+  // d0 - d31
+  DEF_D(0) , DEF_D(1) , DEF_D(2) , DEF_D(3) ,
+  DEF_D(4) , DEF_D(5) , DEF_D(6) , DEF_D(7) ,
+  DEF_D(8) , DEF_D(9) , DEF_D(10), DEF_D(11),
+  DEF_D(12), DEF_D(13), DEF_D(14), DEF_D(15),
+  DEF_D(16), DEF_D(17), DEF_D(18), DEF_D(19),
+  DEF_D(20), DEF_D(21), DEF_D(22), DEF_D(23),
+  DEF_D(24), DEF_D(25), DEF_D(26), DEF_D(27),
+  DEF_D(28), DEF_D(29), DEF_D(30), DEF_D(31),
+  // s0 - s31
+  DEF_S(0) , DEF_S(1) , DEF_S(2) , DEF_S(3) ,
+  DEF_S(4) , DEF_S(5) , DEF_S(6) , DEF_S(7) ,
+  DEF_S(8) , DEF_S(9) , DEF_S(10), DEF_S(11),
+  DEF_S(12), DEF_S(13), DEF_S(14), DEF_S(15),
+  DEF_S(16), DEF_S(17), DEF_S(18), DEF_S(19),
+  DEF_S(20), DEF_S(21), DEF_S(22), DEF_S(23),
+  DEF_S(24), DEF_S(25), DEF_S(26), DEF_S(27),
+  DEF_S(28), DEF_S(29), DEF_S(30), DEF_S(31),
+  // h0 - h31
+  DEF_H(0) , DEF_H(1) , DEF_H(2) , DEF_H(3) ,
+  DEF_H(4) , DEF_H(5) , DEF_H(6) , DEF_H(7) ,
+  DEF_H(8) , DEF_H(9) , DEF_H(10), DEF_H(11),
+  DEF_H(12), DEF_H(13), DEF_H(14), DEF_H(15),
+  DEF_H(16), DEF_H(17), DEF_H(18), DEF_H(19),
+  DEF_H(20), DEF_H(21), DEF_H(22), DEF_H(23),
+  DEF_H(24), DEF_H(25), DEF_H(26), DEF_H(27),
+  DEF_H(28), DEF_H(29), DEF_H(30), DEF_H(31),
+};
+
+constexpr size_t k_num_reg_infos = llvm::array_lengthof(g_reg_infos);
+
+// ARM64 general purpose registers.
+const uint32_t g_gpr_regnums[] = {
+  reg_x0,  reg_x1,  reg_x2,  reg_x3,  reg_x4,  reg_x5,  reg_x6,  reg_x7,
+  reg_x8,  reg_x9,  reg_x10, reg_x11, reg_x12, reg_x13, reg_x14, reg_x15,
+  reg_x16, reg_x17, reg_x18, reg_x19, reg_x20, reg_x21, reg_x22, reg_x23,
+  reg_x24, reg_x25, reg_x26, reg_x27, reg_x28, reg_fp,  reg_lr,  reg_sp,
+  reg_w0,  reg_w1,  reg_w2,  reg_w3,  reg_w4,  reg_w5,  reg_w6,  reg_w7,
+  reg_w8,  reg_w9,  reg_w10, reg_w11, reg_w12, reg_w13, reg_w14, reg_w15,
+  reg_w16, reg_w17, reg_w18, reg_w19, reg_w20, reg_w21, reg_w22, reg_w23,
+  reg_w24, reg_w25, reg_w26, reg_w27, reg_w28, reg_w29, reg_w30, reg_w31,
+  reg_pc,  reg_cpsr,
+  LLDB_INVALID_REGNUM // register sets need to end with this flag
+};
+const uint32_t g_fpu_regnums[] = {
+  reg_v0,  reg_v1,  reg_v2,  reg_v3,  reg_v4,  reg_v5,  reg_v6,  reg_v7,
+  reg_v8,  reg_v9,  reg_v10, reg_v11, reg_v12, reg_v13, reg_v14, reg_v15,
+  reg_v16, reg_v17, reg_v18, reg_v19, reg_v20, reg_v21, reg_v22, reg_v23,
+  reg_v24, reg_v25, reg_v26, reg_v27, reg_v28, reg_v29, reg_v30, reg_v31,
+  reg_d0,  reg_d1,  reg_d2,  reg_d3,  reg_d4,  reg_d5,  reg_d6,  reg_d7,
+  reg_d8,  reg_d9,  reg_d10, reg_d11, reg_d12, reg_d13, reg_d14, reg_d15,
+  reg_d16, reg_d17, reg_d18, reg_d19, reg_d20, reg_d21, reg_d22, reg_d23,
+  reg_d24, reg_d25, reg_d26, reg_d27, reg_d28, reg_d29, reg_d30, reg_d31,
+  reg_s0,  reg_s1,  reg_s2,  reg_s3,  reg_s4,  reg_s5,  reg_s6,  reg_s7,
+  reg_s8,  reg_s9,  reg_s10, reg_s11, reg_s12, reg_s13, reg_s14, reg_s15,
+  reg_s16, reg_s17, reg_s18, reg_s19, reg_s20, reg_s21, reg_s22, reg_s23,
+  reg_s24, reg_s25, reg_s26, reg_s27, reg_s28, reg_s29, reg_s30, reg_s31,
+  reg_h0,  reg_h1,  reg_h2,  reg_h3,  reg_h4,  reg_h5,  reg_h6,  reg_h7,
+  reg_h8,  reg_h9,  reg_h10, reg_h11, reg_h12, reg_h13, reg_h14, reg_h15,
+  reg_h16, reg_h17, reg_h18, reg_h19, reg_h20, reg_h21, reg_h22, reg_h23,
+  reg_h24, reg_h25, reg_h26, reg_h27, reg_h28, reg_h29, reg_h30, reg_h31,
+  reg_fpsr,  reg_fpcr,
+  LLDB_INVALID_REGNUM // register sets need to end with this flag
+};
+
+// Skip the last LLDB_INVALID_REGNUM in each count below by subtracting 1
+constexpr size_t k_num_gpr_regs = llvm::array_lengthof(g_gpr_regnums) - 1;
+constexpr size_t k_num_fpu_regs = llvm::array_lengthof(g_fpu_regnums) - 1;
+
+static RegisterSet g_reg_sets[] = {
+  { "General Purpose Registers", "gpr", k_num_gpr_regs, g_gpr_regnums },
+  { "Floating Point Registers", "fpu", k_num_fpu_regs, g_fpu_regnums },
+};
+
+constexpr size_t k_num_reg_sets = llvm::array_lengthof(g_reg_sets);
+
+RegisterContextMinidump_ARM64::RegisterContextMinidump_ARM64(
+    Thread &thread, const DataExtractor &data) : RegisterContext(thread, 0) {
+  lldb::offset_t offset = 0;
+  m_regs.context_flags = data.GetU64(&offset);
+  for (unsigned i=0; i<32; ++i)
+    m_regs.x[i] = data.GetU64(&offset);
+  m_regs.pc = data.GetU64(&offset);
+  m_regs.cpsr = data.GetU32(&offset);
+  m_regs.fpsr = data.GetU32(&offset);
+  m_regs.fpcr = data.GetU32(&offset);
+  auto regs_data = data.GetData(&offset, sizeof(m_regs.v));
+  if (regs_data)
+    memcpy(m_regs.v, regs_data, sizeof(m_regs.v));
+  assert(k_num_regs == k_num_reg_infos);
+}
+size_t RegisterContextMinidump_ARM64::GetRegisterCount() {
+  return k_num_regs;
+}
+
+const RegisterInfo *
+RegisterContextMinidump_ARM64::GetRegisterInfoAtIndex(size_t reg) {
+  if (reg < k_num_reg_infos)
+    return &g_reg_infos[reg];
+  return nullptr;
+}
+
+size_t RegisterContextMinidump_ARM64::GetRegisterSetCount()  {
+  return k_num_reg_sets;
+}
+
+const RegisterSet *RegisterContextMinidump_ARM64::GetRegisterSet(size_t set) {
+  if (set < k_num_reg_sets)
+    return &g_reg_sets[set];
+  return nullptr;
+}
+
+const char *RegisterContextMinidump_ARM64::GetRegisterName(unsigned reg) {
+  if (reg < k_num_reg_infos)
+    return g_reg_infos[reg].name;
+  return nullptr;
+}
+
+bool RegisterContextMinidump_ARM64::ReadRegister(
+    const RegisterInfo *reg_info, RegisterValue &reg_value) {
+  Status error;
+  reg_value.SetFromMemoryData(reg_info,
+                              (const uint8_t *)&m_regs + reg_info->byte_offset,
+                              reg_info->byte_size, lldb::eByteOrderLittle,
+                              error);
+  return error.Success();
+}
+
+bool RegisterContextMinidump_ARM64::WriteRegister(
+    const RegisterInfo *, const RegisterValue &) {
+  return false;
+}
+
+uint32_t RegisterContextMinidump_ARM64::ConvertRegisterKindToRegisterNumber(
+    lldb::RegisterKind kind, uint32_t num) {
+  for (size_t i=0; i<k_num_regs; ++i) {
+    if (g_reg_infos[i].kinds[kind] == num)
+      return i;
+  }
+  return LLDB_INVALID_REGNUM;
+}

source/Plugins/Process/minidump/ThreadMinidump.cpp

 //===-- ThreadMinidump.cpp --------------------------------------*- C++ -*-===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 
 // Project includes
 #include "ThreadMinidump.h"
 #include "ProcessMinidump.h"
 
 #include "RegisterContextMinidump_x86_32.h"
 #include "RegisterContextMinidump_x86_64.h"
+#include "RegisterContextMinidump_ARM.h"
+#include "RegisterContextMinidump_ARM64.h"
 
 // Other libraries and framework includes
 #include "Plugins/Process/Utility/RegisterContextLinux_i386.h"
 #include "Plugins/Process/Utility/RegisterContextLinux_x86_64.h"
 #include "Plugins/Process/elf-core/RegisterContextPOSIXCore_x86_64.h"
 #include "Plugins/Process/elf-core/RegisterUtilities.h"
 
 #include "lldb/Target/RegisterContext.h"
case llvm::Triple::x86_64: {
       reg_interface = new RegisterContextLinux_x86_64(arch);
       lldb::DataBufferSP buf =
           ConvertMinidumpContext_x86_64(m_gpregset_data, reg_interface);
       DataExtractor gpregset(buf, lldb::eByteOrderLittle, 8);
       m_thread_reg_ctx_sp.reset(new RegisterContextCorePOSIX_x86_64(
           *this, reg_interface, gpregset, {}));
       break;
     }
-    default:
+    case llvm::Triple::aarch64: {
+      DataExtractor data(m_gpregset_data.data(), m_gpregset_data.size(),
+                         lldb::eByteOrderLittle, 8);
+      m_thread_reg_ctx_sp.reset(new RegisterContextMinidump_ARM64(*this, data));
       break;
     }
-
-    if (!reg_interface) {
-      if (log)
-        log->Printf("elf-core::%s:: Architecture(%d) not supported",
-                    __FUNCTION__, arch.GetMachine());
-      assert(false && "Architecture not supported");
+    case llvm::Triple::arm: {
+      DataExtractor data(m_gpregset_data.data(), m_gpregset_data.size(),
+                         lldb::eByteOrderLittle, 8);
+      const bool apple = arch.GetTriple().getVendor() == llvm::Triple::Apple;
+      m_thread_reg_ctx_sp.reset(new RegisterContextMinidump_ARM(*this, data,
+                                                                apple));
+      break;
+    }
+    default:
+      break;
     }
 
     reg_ctx_sp = m_thread_reg_ctx_sp;
   } else if (m_unwinder_ap) {
     reg_ctx_sp = m_unwinder_ap->CreateRegisterContextForFrame(frame);
   }
 
   return reg_ctx_sp;
 }
 
 bool ThreadMinidump::CalculateStopInfo() { return false; }

source/Target/Target.cpp

if (executable_objfile && get_dependent_files) {
           if (objfile)
             objfile->GetDependentModules(dependent_files);
         }
       }
     }
   }
 }
 
-bool Target::SetArchitecture(const ArchSpec &arch_spec) {
+bool Target::SetArchitecture(const ArchSpec &arch_spec, bool set_platform) {
   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_TARGET));
   bool missing_local_arch = !m_arch.GetSpec().IsValid();
   bool replace_local_arch = true;
   bool compatible_local_arch = false;
   ArchSpec other(arch_spec);
 
+  // Changing the architecture might mean that the currently selected platform
+  // isn't compatible. Set the platform correctly if we are asked to do so,
+  // otherwise assume the user will set the platform manually.
+  if (set_platform) {
+    if (other.IsValid()) {
+      auto platform_sp = GetPlatform();
+      if (!platform_sp ||
+          !platform_sp->IsCompatibleArchitecture(other, false, nullptr)) {
+        ArchSpec platform_arch;
+        auto arch_platform_sp = Platform::GetPlatformForArchitecture(
+            other, &platform_arch);
+        if (arch_platform_sp) {
+          SetPlatform(arch_platform_sp);
+          if (platform_arch.IsValid())
+            other = platform_arch;
+        }
+      }
+    }
+  }
+  
   if (!missing_local_arch) {
     if (m_arch.GetSpec().IsCompatibleMatch(arch_spec)) {
       other.MergeFrom(m_arch.GetSpec());
 
       if (m_arch.GetSpec().IsCompatibleMatch(other)) {
         compatible_local_arch = true;
         bool arch_changed, vendor_changed, os_changed, os_ver_changed,
             env_changed;