First cut at adding arm64 Linux / Android support to Breakpad.

This is an initial attempt to add Arm64 (aarch64) support to Breakpad for
Linux / Android platforms.  This CL adds the Arm64 data structures, but does
not yet implement the Android getcontext support or CPUFillFromThreadInfo /
CPUFillFromUContext.

BUG=354405,335641
R=mark@chromium.org

Review URL: https://breakpad.appspot.com/1354002

git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@1301 4c0a9323-5329-0410-9bdc-e9ce6186880e

src/client/linux/handler/exception_handler.cc

@@ -398,8 +398,8 @@ bool ExceptionHandler::HandleSignal(int sig, siginfo_t* info, void* uc) {
   CrashContext context;
   memcpy(&context.siginfo, info, sizeof(siginfo_t));
   memcpy(&context.context, uc, sizeof(struct ucontext));
-#if !defined(__ARM_EABI__) && !defined(__mips__)
-  // FP state is not part of user ABI on ARM Linux.
+#if !defined(__ARM_EABI__) && !defined(__aarch64__) && !defined(__mips__)
+  // FP state is not part of user ABI on ARM or ARM64 Linux.
   // In case of MIPS Linux FP state is already part of struct ucontext
   // and 'float_state' is not a member of CrashContext.
   struct ucontext *uc_ptr = (struct ucontext*)uc;
@@ -608,7 +608,7 @@ bool ExceptionHandler::WriteMinidump() {
   }
 #endif
 
-#if !defined(__ARM_EABI__) && !defined(__mips__)
+#if !defined(__ARM_EABI__) && !defined(__aarch64__) && !defined(__mips__)
   // FPU state is not part of ARM EABI ucontext_t.
   memcpy(&context.float_state, context.context.uc_mcontext.fpregs,
          sizeof(context.float_state));
@@ -627,6 +627,9 @@ bool ExceptionHandler::WriteMinidump() {
 #elif defined(__arm__)
   context.siginfo.si_addr =
       reinterpret_cast<void*>(context.context.uc_mcontext.arm_pc);
+#elif defined(__aarch64__)
+  context.siginfo.si_addr =
+      reinterpret_cast<void*>(context.context.uc_mcontext.pc);
 #elif defined(__mips__)
   context.siginfo.si_addr =
       reinterpret_cast<void*>(context.context.uc_mcontext.pc);

src/client/linux/handler/exception_handler.h

@@ -190,10 +190,10 @@ class ExceptionHandler {
     siginfo_t siginfo;
     pid_t tid;  // the crashing thread.
     struct ucontext context;
-#if !defined(__ARM_EABI__) && !defined(__mips__)
-    // #ifdef this out because FP state is not part of user ABI for Linux ARM.
-    // In case of MIPS Linux FP state is already part of struct ucontext
-    // so 'float_state' is not required.
+#if !defined(__ARM_EABI__) && !defined(__aarch64__) && !defined(__mips__)
+    // #ifdef this out because FP state is not part of user ABI for Linux ARM
+    // or ARM64. In case of MIPS Linux FP state is already part of struct
+    // ucontext so 'float_state' is not required.
     struct _libc_fpstate float_state;
 #endif
   };
@@ -259,7 +259,7 @@ class ExceptionHandler {
   // We need to explicitly enable ptrace of parent processes on some
   // kernels, but we need to know the PID of the cloned process before we
   // can do this. We create a pipe which we can use to block the
-  // cloned process after creating it, until we have explicitly enabled 
+  // cloned process after creating it, until we have explicitly enabled
   // ptrace. This is used to store the file descriptors for the pipe
   int fdes[2];
 

src/client/linux/minidump_writer/linux_core_dumper.cc

@@ -99,8 +99,10 @@ bool LinuxCoreDumper::GetThreadInfoByIndex(size_t index, ThreadInfo* info) {
   memcpy(&stack_pointer, &info->regs.rsp, sizeof(info->regs.rsp));
 #elif defined(__ARM_EABI__)
   memcpy(&stack_pointer, &info->regs.ARM_sp, sizeof(info->regs.ARM_sp));
+#elif defined(__aarch64__)
+  memcpy(&stack_pointer, &info->regs.sp, sizeof(info->regs.sp));
 #elif defined(__mips__)
-  stack_pointer = 
+  stack_pointer =
       reinterpret_cast<uint8_t*>(info->regs.regs[MD_CONTEXT_MIPS_REG_SP]);
 #else
 #error "This code hasn't been ported to your platform yet."

src/client/linux/minidump_writer/linux_dumper.h

@@ -56,7 +56,7 @@ typedef typeof(((struct user*) 0)->u_debugreg[0]) debugreg_t;
 // Typedef for our parsing of the auxv variables in /proc/pid/auxv.
 #if defined(__i386) || defined(__ARM_EABI__) || defined(__mips__)
 typedef Elf32_auxv_t elf_aux_entry;
-#elif defined(__x86_64)
+#elif defined(__x86_64) || defined(__aarch64__)
 typedef Elf64_auxv_t elf_aux_entry;
 #endif
 
@@ -88,6 +88,10 @@ struct ThreadInfo {
   // Mimicking how strace does this(see syscall.c, search for GETREGS)
   struct user_regs regs;
   struct user_fpregs fpregs;
+#elif defined(__aarch64__)
+  // Use the structures defined in <asm/ptrace.h>
+  struct user_pt_regs regs;
+  struct user_fpsimd_state fpregs;
 #elif defined(__mips__)
   user_regs_struct regs;
   user_fpregs_struct fpregs;

src/client/linux/minidump_writer/linux_ptrace_dumper.cc

@@ -47,6 +47,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <sys/ptrace.h>
+#include <sys/uio.h>
 #include <sys/wait.h>
 
 #if defined(__i386)
@@ -186,6 +187,20 @@ bool LinuxPtraceDumper::GetThreadInfoByIndex(size_t index, ThreadInfo* info) {
   if (info->ppid == -1 || info->tgid == -1)
     return false;
 
+#ifdef PTRACE_GETREGSET
+  struct iovec io;
+  io.iov_base = &info->regs;
+  io.iov_len = sizeof(info->regs);
+  if (sys_ptrace(PTRACE_GETREGSET, tid, (void*)NT_PRSTATUS, (void*)&io) == -1) {
+    return false;
+  }
+
+  io.iov_base = &info->fpregs;
+  io.iov_len = sizeof(info->fpregs);
+  if (sys_ptrace(PTRACE_GETREGSET, tid, (void*)NT_FPREGSET, (void*)&io) == -1) {
+    return false;
+  }
+#else
   if (sys_ptrace(PTRACE_GETREGS, tid, NULL, &info->regs) == -1) {
     return false;
   }
@@ -193,6 +208,7 @@ bool LinuxPtraceDumper::GetThreadInfoByIndex(size_t index, ThreadInfo* info) {
   if (sys_ptrace(PTRACE_GETFPREGS, tid, NULL, &info->fpregs) == -1) {
     return false;
   }
+#endif
 
 #if defined(__i386)
 #if !defined(bit_FXSAVE)  // e.g. Clang
@@ -241,6 +257,8 @@ bool LinuxPtraceDumper::GetThreadInfoByIndex(size_t index, ThreadInfo* info) {
   my_memcpy(&stack_pointer, &info->regs.rsp, sizeof(info->regs.rsp));
 #elif defined(__ARM_EABI__)
   my_memcpy(&stack_pointer, &info->regs.ARM_sp, sizeof(info->regs.ARM_sp));
+#elif defined(__aarch64__)
+  my_memcpy(&stack_pointer, &info->regs.sp, sizeof(info->regs.sp));
 #elif defined(__mips__)
   stack_pointer =
       reinterpret_cast<uint8_t*>(info->regs.regs[MD_CONTEXT_MIPS_REG_SP]);

src/client/linux/minidump_writer/minidump_writer.cc

@@ -374,6 +374,19 @@ void CPUFillFromUContext(MDRawContextARM* out, const ucontext* uc,
   my_memset(&out->float_save.extra, 0, sizeof(out->float_save.extra));
 }
 
+#elif defined(__aarch64__)
+typedef MDRawContextARM64 RawContextCPU;
+
+void CPUFillFromThreadInfo(MDRawContextARM64* out,
+                           const google_breakpad::ThreadInfo& info) {
+  // TODO(rmcilroy): Implement for arm64.
+}
+
+void CPUFillFromUContext(MDRawContextARM64* out, const ucontext* uc,
+                         const struct _libc_fpstate* fpregs) {
+  // TODO(rmcilroy): Implement for arm64.
+}
+
 #elif defined(__mips__)
 typedef MDRawContextMIPS RawContextCPU;
 
@@ -470,7 +483,7 @@ class MinidumpWriter {
       : fd_(minidump_fd),
         path_(minidump_path),
         ucontext_(context ? &context->context : NULL),
-#if !defined(__ARM_EABI__) && !defined(__mips__)
+#if !defined(__ARM_EABI__) && !defined(__mips__) && !defined(__aarch64__)
         float_state_(context ? &context->float_state : NULL),
 #else
         // TODO: fix this after fixing ExceptionHandler
@@ -1271,6 +1284,18 @@ class MinidumpWriter {
   uintptr_t GetInstructionPointer(const ThreadInfo& info) {
     return info.regs.uregs[15];
   }
+#elif defined(__aarch64__)
+  uintptr_t GetStackPointer() {
+    return ucontext_->uc_mcontext.sp;
+  }
+
+  uintptr_t GetInstructionPointer() {
+    return ucontext_->uc_mcontext.pc;
+  }
+
+  uintptr_t GetInstructionPointer(const ThreadInfo& info) {
+    return info.regs.pc;
+  }
 #elif defined(__mips__)
   uintptr_t GetStackPointer() {
     return ucontext_->uc_mcontext.gregs[MD_CONTEXT_MIPS_REG_SP];
@@ -1581,6 +1606,11 @@ class MinidumpWriter {
 
     return true;
   }
+#elif defined(__aarch64__)
+  bool WriteCPUInformation(MDRawSystemInfo* sys_info) {
+    // TODO(rmcilroy): Implement for arm64.
+    return false;
+  }
 #else
 #  error "Unsupported CPU"
 #endif