Add backtrace support for mips64.

Change-Id: I12ea2fcbe6780bb596f51988eae1ceafcec858df

4 files changed, 153 insertions, 3 deletions

diff --git a/debuggerd/Android.mk b/debuggerd/Android.mk
index fbaac39..8cc4682 100644
--- a/debuggerd/Android.mk
+++ b/debuggerd/Android.mk
@@ -12,7 +12,7 @@ LOCAL_SRC_FILES:= \
 LOCAL_SRC_FILES_arm    := arm/machine.cpp
 LOCAL_SRC_FILES_arm64  := arm64/machine.cpp
 LOCAL_SRC_FILES_mips   := mips/machine.cpp
-LOCAL_SRC_FILES_mips64 := mips/machine.cpp
+LOCAL_SRC_FILES_mips64 := mips64/machine.cpp
 LOCAL_SRC_FILES_x86    := x86/machine.cpp
 LOCAL_SRC_FILES_x86_64 := x86_64/machine.cpp
 
@@ -49,7 +49,7 @@ LOCAL_SRC_FILES := crasher.c
 LOCAL_SRC_FILES_arm    := arm/crashglue.S
 LOCAL_SRC_FILES_arm64  := arm64/crashglue.S
 LOCAL_SRC_FILES_mips   := mips/crashglue.S
-LOCAL_SRC_FILES_mips64 := mips/crashglue.S
+LOCAL_SRC_FILES_mips64 := mips64/crashglue.S
 LOCAL_SRC_FILES_x86    := x86/crashglue.S
 LOCAL_SRC_FILES_x86_64 := x86_64/crashglue.S
 LOCAL_MODULE_PATH := $(TARGET_OUT_OPTIONAL_EXECUTABLES)
diff --git a/debuggerd/mips64/crashglue.S b/debuggerd/mips64/crashglue.S
new file mode 100644
index 0000000..70a6641
--- /dev/null
+++ b/debuggerd/mips64/crashglue.S
@@ -0,0 +1,48 @@
+	.set	noat
+
+	.globl crash1
+	.globl crashnostack
+
+crash1:
+	li	$0,0xdead0000+0
+	li	$1,0xdead0000+1
+	li	$2,0xdead0000+2
+	li	$3,0xdead0000+3
+	li	$4,0xdead0000+4
+	li	$5,0xdead0000+5
+	li	$6,0xdead0000+6
+	li	$7,0xdead0000+7
+	li	$8,0xdead0000+8
+	li	$9,0xdead0000+9
+	li	$10,0xdead0000+10
+	li	$11,0xdead0000+11
+	li	$12,0xdead0000+12
+	li	$13,0xdead0000+13
+	li	$14,0xdead0000+14
+	li	$15,0xdead0000+15
+	li	$16,0xdead0000+16
+	li	$17,0xdead0000+17
+	li	$18,0xdead0000+18
+	li	$19,0xdead0000+19
+	li	$20,0xdead0000+20
+	li	$21,0xdead0000+21
+	li	$22,0xdead0000+22
+	li	$23,0xdead0000+23
+	li	$24,0xdead0000+24
+	li	$25,0xdead0000+25
+	li	$26,0xdead0000+26
+	li	$27,0xdead0000+27
+	li	$28,0xdead0000+28
+	# don't trash the stack otherwise the signal handler won't run
+	#li	$29,0xdead0000+29
+	li	$30,0xdead0000+30
+	li	$31,0xdead0000+31
+
+	lw	$zero,($0)
+	b .
+
+
+crashnostack:
+	li	$sp, 0
+	lw	$zero,($0)
+	b .
diff --git a/debuggerd/mips64/machine.cpp b/debuggerd/mips64/machine.cpp
new file mode 100644
index 0000000..ef9092f
--- /dev/null
+++ b/debuggerd/mips64/machine.cpp
@@ -0,0 +1,100 @@
+/*
+ * Copyright 2014, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/ptrace.h>
+
+#include <sys/user.h>
+
+#include "../utility.h"
+#include "../machine.h"
+
+#define R(x) (static_cast<unsigned long>(x))
+
+// If configured to do so, dump memory around *all* registers
+// for the crashing thread.
+void dump_memory_and_code(log_t* log, pid_t tid) {
+  pt_regs r;
+  if (ptrace(PTRACE_GETREGS, tid, 0, &r)) {
+    return;
+  }
+
+  static const char REG_NAMES[] = "$0atv0v1a0a1a2a3a4a5a6a7t0t1t2t3s0s1s2s3s4s5s6s7t8t9k0k1gpsps8ra";
+
+  for (int reg = 0; reg < 32; reg++) {
+    // skip uninteresting registers
+    if (reg == 0 // $0
+        || reg == 26 // $k0
+        || reg == 27 // $k1
+        || reg == 31 // $ra (done below)
+       )
+      continue;
+
+    uintptr_t addr = R(r.regs[reg]);
+
+    // Don't bother if it looks like a small int or ~= null, or if
+    // it's in the kernel area.
+    if (addr < 4096 || addr >= 0x4000000000000000) {
+      continue;
+    }
+
+    _LOG(log, logtype::MEMORY, "\nmemory near %.2s:\n", &REG_NAMES[reg * 2]);
+    dump_memory(log, tid, addr);
+  }
+
+  unsigned long pc = R(r.cp0_epc);
+  unsigned long ra = R(r.regs[31]);
+
+  _LOG(log, logtype::MEMORY, "\ncode around pc:\n");
+  dump_memory(log, tid, (uintptr_t)pc);
+
+  if (pc != ra) {
+    _LOG(log, logtype::MEMORY, "\ncode around ra:\n");
+    dump_memory(log, tid, (uintptr_t)ra);
+  }
+}
+
+void dump_registers(log_t* log, pid_t tid) {
+  pt_regs r;
+  if(ptrace(PTRACE_GETREGS, tid, 0, &r)) {
+    _LOG(log, logtype::ERROR, "cannot get registers: %s\n", strerror(errno));
+    return;
+  }
+
+  _LOG(log, logtype::REGISTERS, " zr %016lx  at %016lx  v0 %016lx  v1 %016lx\n",
+       R(r.regs[0]), R(r.regs[1]), R(r.regs[2]), R(r.regs[3]));
+  _LOG(log, logtype::REGISTERS, " a0 %016lx  a1 %016lx  a2 %016lx  a3 %016lx\n",
+       R(r.regs[4]), R(r.regs[5]), R(r.regs[6]), R(r.regs[7]));
+  _LOG(log, logtype::REGISTERS, " a4 %016lx  a5 %016lx  a6 %016lx  a7 %016lx\n",
+       R(r.regs[8]), R(r.regs[9]), R(r.regs[10]), R(r.regs[11]));
+  _LOG(log, logtype::REGISTERS, " t0 %016lx  t1 %016lx  t2 %016lx  t3 %016lx\n",
+       R(r.regs[12]), R(r.regs[13]), R(r.regs[14]), R(r.regs[15]));
+  _LOG(log, logtype::REGISTERS, " s0 %016lx  s1 %016lx  s2 %016lx  s3 %016lx\n",
+       R(r.regs[16]), R(r.regs[17]), R(r.regs[18]), R(r.regs[19]));
+  _LOG(log, logtype::REGISTERS, " s4 %016lx  s5 %016lx  s6 %016lx  s7 %016lx\n",
+       R(r.regs[20]), R(r.regs[21]), R(r.regs[22]), R(r.regs[23]));
+  _LOG(log, logtype::REGISTERS, " t8 %016lx  t9 %016lx  k0 %016lx  k1 %016lx\n",
+       R(r.regs[24]), R(r.regs[25]), R(r.regs[26]), R(r.regs[27]));
+  _LOG(log, logtype::REGISTERS, " gp %016lx  sp %016lx  s8 %016lx  ra %016lx\n",
+       R(r.regs[28]), R(r.regs[29]), R(r.regs[30]), R(r.regs[31]));
+  _LOG(log, logtype::REGISTERS, " hi %016lx  lo %016lx bva %016lx epc %016lx\n",
+       R(r.hi), R(r.lo), R(r.cp0_badvaddr), R(r.cp0_epc));
+}
diff --git a/debuggerd/utility.h b/debuggerd/utility.h
index 58a882c..49b46e8 100644
--- a/debuggerd/utility.h
+++ b/debuggerd/utility.h
@@ -26,8 +26,10 @@
 #define ABI_STRING "arm"
 #elif defined(__aarch64__)
 #define ABI_STRING "arm64"
-#elif defined(__mips__)
+#elif defined(__mips__) && !defined(__LP64__)
 #define ABI_STRING "mips"
+#elif defined(__mips__) && defined(__LP64__)
+#define ABI_STRING "mips64"
 #elif defined(__i386__)
 #define ABI_STRING "x86"
 #elif defined(__x86_64__)