Use libcorkscrew in debuggerd.

Change-Id: I5e3645a39d96c808f87075b49111d0262a19a0c8

3 files changed, 48 insertions, 1296 deletions

diff --git a/debuggerd/arm/machine.c b/debuggerd/arm/machine.c
index 5055444..891b1ef 100644
--- a/debuggerd/arm/machine.c
+++ b/debuggerd/arm/machine.c
@@ -34,10 +34,11 @@
 #include <linux/input.h>
 #include <linux/user.h>
 
-#include "utility.h"
+#include "../utility.h"
+#include "../machine.h"
 
 /* enable to dump memory pointed to by every register */
-#define DUMP_MEM_FOR_ALL_REGS 1
+#define DUMP_MEMORY_FOR_ALL_REGISTERS 1
 
 #ifdef WITH_VFP
 #ifdef WITH_VFP_D32
@@ -47,172 +48,22 @@
 #endif
 #endif
 
-/* Main entry point to get the backtrace from the crashing process */
-extern int unwind_backtrace_with_ptrace(int tfd, pid_t pid, mapinfo *map,
-                                        unsigned int sp_list[],
-                                        int *frame0_pc_sane,
-                                        bool at_fault);
-
 /*
- * If this isn't clearly a null pointer dereference, dump the
- * /proc/maps entries near the fault address.
- *
- * This only makes sense to do on the thread that crashed.
+ * If configured to do so, dump memory around *all* registers
+ * for the crashing thread.
  */
-static void show_nearby_maps(int tfd, int pid, mapinfo *map)
-{
-    siginfo_t si;
-
-    memset(&si, 0, sizeof(si));
-    if (ptrace(PTRACE_GETSIGINFO, pid, 0, &si)) {
-        _LOG(tfd, false, "cannot get siginfo for %d: %s\n",
-            pid, strerror(errno));
-        return;
-    }
-    if (!signal_has_address(si.si_signo))
+static void dump_memory_and_code(int tfd, pid_t tid, bool at_fault) {
+    struct pt_regs regs;
+    if(ptrace(PTRACE_GETREGS, tid, 0, &regs)) {
         return;
-
-    uintptr_t addr = (uintptr_t) si.si_addr;
-    addr &= ~0xfff;     /* round to 4K page boundary */
-    if (addr == 0)      /* null-pointer deref */
-        return;
-
-    _LOG(tfd, false, "\nmemory map around addr %08x:\n", si.si_addr);
-
-    /*
-     * Search for a match, or for a hole where the match would be.  The list
-     * is backward from the file content, so it starts at high addresses.
-     */
-    bool found = false;
-    mapinfo *next = NULL;
-    mapinfo *prev = NULL;
-    while (map != NULL) {
-        if (addr >= map->start && addr < map->end) {
-            found = true;
-            next = map->next;
-            break;
-        } else if (addr >= map->end) {
-            /* map would be between "prev" and this entry */
-            next = map;
-            map = NULL;
-            break;
-        }
-
-        prev = map;
-        map = map->next;
-    }
-
-    /*
-     * Show "next" then "match" then "prev" so that the addresses appear in
-     * ascending order (like /proc/pid/maps).
-     */
-    if (next != NULL) {
-        _LOG(tfd, false, "%08x-%08x %s\n", next->start, next->end, next->name);
-    } else {
-        _LOG(tfd, false, "(no map below)\n");
-    }
-    if (map != NULL) {
-        _LOG(tfd, false, "%08x-%08x %s\n", map->start, map->end, map->name);
-    } else {
-        _LOG(tfd, false, "(no map for address)\n");
-    }
-    if (prev != NULL) {
-        _LOG(tfd, false, "%08x-%08x %s\n", prev->start, prev->end, prev->name);
-    } else {
-        _LOG(tfd, false, "(no map above)\n");
-    }
-}
-
-/*
- * Dumps a few bytes of memory, starting a bit before and ending a bit
- * after the specified address.
- */
-static void dump_memory(int tfd, int pid, uintptr_t addr,
-    bool only_in_tombstone)
-{
-    char code_buffer[64];       /* actual 8+1+((8+1)*4) + 1 == 45 */
-    char ascii_buffer[32];      /* actual 16 + 1 == 17 */
-    uintptr_t p, end;
-
-    p = addr & ~3;
-    p -= 32;
-    if (p > addr) {
-        /* catch underflow */
-        p = 0;
-    }
-    end = p + 80;
-    /* catch overflow; 'end - p' has to be multiples of 16 */
-    while (end < p)
-        end -= 16;
-
-    /* Dump the code around PC as:
-     *  addr     contents                             ascii
-     *  00008d34 ef000000 e8bd0090 e1b00000 512fff1e  ............../Q
-     *  00008d44 ea00b1f9 e92d0090 e3a070fc ef000000  ......-..p......
-     */
-    while (p < end) {
-        char* asc_out = ascii_buffer;
-
-        sprintf(code_buffer, "%08x ", p);
-
-        int i;
-        for (i = 0; i < 4; i++) {
-            /*
-             * If we see (data == -1 && errno != 0), we know that the ptrace
-             * call failed, probably because we're dumping memory in an
-             * unmapped or inaccessible page.  I don't know if there's
-             * value in making that explicit in the output -- it likely
-             * just complicates parsing and clarifies nothing for the
-             * enlightened reader.
-             */
-            long data = ptrace(PTRACE_PEEKTEXT, pid, (void*)p, NULL);
-            sprintf(code_buffer + strlen(code_buffer), "%08lx ", data);
-
-            int j;
-            for (j = 0; j < 4; j++) {
-                /*
-                 * Our isprint() allows high-ASCII characters that display
-                 * differently (often badly) in different viewers, so we
-                 * just use a simpler test.
-                 */
-                char val = (data >> (j*8)) & 0xff;
-                if (val >= 0x20 && val < 0x7f) {
-                    *asc_out++ = val;
-                } else {
-                    *asc_out++ = '.';
-                }
-            }
-            p += 4;
-        }
-        *asc_out = '\0';
-        _LOG(tfd, only_in_tombstone, "%s %s\n", code_buffer, ascii_buffer);
     }
 
-}
-
-void dump_stack_and_code(int tfd, int pid, mapinfo *map,
-                         int unwind_depth, unsigned int sp_list[],
-                         bool at_fault)
-{
-    struct pt_regs r;
-    int sp_depth;
-    bool only_in_tombstone = !at_fault;
-
-    if(ptrace(PTRACE_GETREGS, pid, 0, &r)) return;
-
-    if (DUMP_MEM_FOR_ALL_REGS && at_fault) {
-        /*
-         * If configured to do so, dump memory around *all* registers
-         * for the crashing thread.
-         *
-         * TODO: remove duplicates.
-         */
-        static const char REG_NAMES[] = "R0R1R2R3R4R5R6R7R8R9SLFPIPSPLRPC";
+    if (at_fault && DUMP_MEMORY_FOR_ALL_REGISTERS) {
+        static const char REG_NAMES[] = "r0r1r2r3r4r5r6r7r8r9slfpipsp";
 
-        int reg;
-        for (reg = 0; reg < 16; reg++) {
+        for (int reg = 0; reg < 14; reg++) {
             /* this may not be a valid way to access, but it'll do for now */
-            uintptr_t addr = r.uregs[reg];
+            uintptr_t addr = regs.uregs[reg];
 
             /*
              * Don't bother if it looks like a small int or ~= null, or if
@@ -222,152 +73,65 @@ void dump_stack_and_code(int tfd, int pid, mapinfo *map,
                 continue;
             }
 
-            _LOG(tfd, only_in_tombstone, "\nmem near %.2s:\n",
-                &REG_NAMES[reg*2]);
-            dump_memory(tfd, pid, addr, false);
-        }
-    } else {
-        unsigned int pc, lr;
-        pc = r.ARM_pc;
-        lr = r.ARM_lr;
-
-        _LOG(tfd, only_in_tombstone, "\ncode around pc:\n");
-        dump_memory(tfd, pid, (uintptr_t) pc, only_in_tombstone);
-
-        if (lr != pc) {
-            _LOG(tfd, only_in_tombstone, "\ncode around lr:\n");
-            dump_memory(tfd, pid, (uintptr_t) lr, only_in_tombstone);
-        }
-    }
-
-    if (at_fault) {
-        show_nearby_maps(tfd, pid, map);
-    }
-
-    unsigned int p, end;
-    unsigned int sp = r.ARM_sp;
-
-    p = sp - 64;
-    if (p > sp)
-        p = 0;
-    p &= ~3;
-    if (unwind_depth != 0) {
-        if (unwind_depth < STACK_CONTENT_DEPTH) {
-            end = sp_list[unwind_depth-1];
+            _LOG(tfd, false, "\nmemory near %.2s:\n", &REG_NAMES[reg * 2]);
+            dump_memory(tfd, tid, addr, at_fault);
         }
-        else {
-            end = sp_list[STACK_CONTENT_DEPTH-1];
-        }
-    }
-    else {
-        end = p + 256;
-        /* 'end - p' has to be multiples of 4 */
-        if (end < p)
-            end = ~7;
-    }
-
-    _LOG(tfd, only_in_tombstone, "\nstack:\n");
-
-    /* If the crash is due to PC == 0, there will be two frames that
-     * have identical SP value.
-     */
-    if (sp_list[0] == sp_list[1]) {
-        sp_depth = 1;
-    }
-    else {
-        sp_depth = 0;
     }
 
-    while (p <= end) {
-         char *prompt;
-         char level[16];
-         long data = ptrace(PTRACE_PEEKTEXT, pid, (void*)p, NULL);
-         if (p == sp_list[sp_depth]) {
-             sprintf(level, "#%02d", sp_depth++);
-             prompt = level;
-         }
-         else {
-             prompt = "   ";
-         }
+    _LOG(tfd, !at_fault, "\ncode around pc:\n");
+    dump_memory(tfd, tid, (uintptr_t)regs.ARM_pc, at_fault);
 
-         /* Print the stack content in the log for the first 3 frames. For the
-          * rest only print them in the tombstone file.
-          */
-         _LOG(tfd, (sp_depth > 2) || only_in_tombstone,
-              "%s %08x  %08x  %s\n", prompt, p, data,
-              map_to_name(map, data, ""));
-         p += 4;
+    if (regs.ARM_pc != regs.ARM_lr) {
+        _LOG(tfd, !at_fault, "\ncode around lr:\n");
+        dump_memory(tfd, tid, (uintptr_t)regs.ARM_lr, at_fault);
     }
-    /* print another 64-byte of stack data after the last frame */
-
-    end = p+64;
-    /* 'end - p' has to be multiples of 4 */
-    if (end < p)
-        end = ~7;
-
-    while (p <= end) {
-         long data = ptrace(PTRACE_PEEKTEXT, pid, (void*)p, NULL);
-         _LOG(tfd, (sp_depth > 2) || only_in_tombstone,
-              "    %08x  %08x  %s\n", p, data,
-              map_to_name(map, data, ""));
-         p += 4;
-    }
-}
-
-void dump_pc_and_lr(int tfd, int pid, mapinfo *map, int unwound_level,
-                    bool at_fault)
-{
-    struct pt_regs r;
-
-    if(ptrace(PTRACE_GETREGS, pid, 0, &r)) {
-        _LOG(tfd, !at_fault, "tid %d not responding!\n", pid);
-        return;
-    }
-
-    if (unwound_level == 0) {
-        _LOG(tfd, !at_fault, "         #%02d  pc %08x  %s\n", 0, r.ARM_pc,
-             map_to_name(map, r.ARM_pc, "<unknown>"));
-    }
-    _LOG(tfd, !at_fault, "         #%02d  lr %08x  %s\n", 1, r.ARM_lr,
-            map_to_name(map, r.ARM_lr, "<unknown>"));
 }
 
-void dump_registers(int tfd, int pid, bool at_fault)
+void dump_registers(ptrace_context_t* context __attribute((unused)),
+        int tfd, pid_t tid, bool at_fault)
 {
     struct pt_regs r;
     bool only_in_tombstone = !at_fault;
 
-    if(ptrace(PTRACE_GETREGS, pid, 0, &r)) {
-        _LOG(tfd, only_in_tombstone,
-             "cannot get registers: %s\n", strerror(errno));
+    if(ptrace(PTRACE_GETREGS, tid, 0, &r)) {
+        _LOG(tfd, only_in_tombstone, "cannot get registers: %s\n", strerror(errno));
         return;
     }
 
-    _LOG(tfd, only_in_tombstone, " r0 %08x  r1 %08x  r2 %08x  r3 %08x\n",
-         r.ARM_r0, r.ARM_r1, r.ARM_r2, r.ARM_r3);
-    _LOG(tfd, only_in_tombstone, " r4 %08x  r5 %08x  r6 %08x  r7 %08x\n",
-         r.ARM_r4, r.ARM_r5, r.ARM_r6, r.ARM_r7);
-    _LOG(tfd, only_in_tombstone, " r8 %08x  r9 %08x  10 %08x  fp %08x\n",
-         r.ARM_r8, r.ARM_r9, r.ARM_r10, r.ARM_fp);
-    _LOG(tfd, only_in_tombstone,
-         " ip %08x  sp %08x  lr %08x  pc %08x  cpsr %08x\n",
-         r.ARM_ip, r.ARM_sp, r.ARM_lr, r.ARM_pc, r.ARM_cpsr);
+    _LOG(tfd, only_in_tombstone, "    r0 %08x  r1 %08x  r2 %08x  r3 %08x\n",
+            (uint32_t)r.ARM_r0, (uint32_t)r.ARM_r1, (uint32_t)r.ARM_r2, (uint32_t)r.ARM_r3);
+    _LOG(tfd, only_in_tombstone, "    r4 %08x  r5 %08x  r6 %08x  r7 %08x\n",
+            (uint32_t)r.ARM_r4, (uint32_t)r.ARM_r5, (uint32_t)r.ARM_r6, (uint32_t)r.ARM_r7);
+    _LOG(tfd, only_in_tombstone, "    r8 %08x  r9 %08x  sl %08x  fp %08x\n",
+            (uint32_t)r.ARM_r8, (uint32_t)r.ARM_r9, (uint32_t)r.ARM_r10, (uint32_t)r.ARM_fp);
+    _LOG(tfd, only_in_tombstone, "    ip %08x  sp %08x  lr %08x  pc %08x  cpsr %08x\n",
+            (uint32_t)r.ARM_ip, (uint32_t)r.ARM_sp, (uint32_t)r.ARM_lr,
+            (uint32_t)r.ARM_pc, (uint32_t)r.ARM_cpsr);
 
 #ifdef WITH_VFP
     struct user_vfp vfp_regs;
     int i;
 
-    if(ptrace(PTRACE_GETVFPREGS, pid, 0, &vfp_regs)) {
-        _LOG(tfd, only_in_tombstone,
-             "cannot get registers: %s\n", strerror(errno));
+    if(ptrace(PTRACE_GETVFPREGS, tid, 0, &vfp_regs)) {
+        _LOG(tfd, only_in_tombstone, "cannot get registers: %s\n", strerror(errno));
         return;
     }
 
     for (i = 0; i < NUM_VFP_REGS; i += 2) {
-        _LOG(tfd, only_in_tombstone,
-             " d%-2d %016llx  d%-2d %016llx\n",
-              i, vfp_regs.fpregs[i], i+1, vfp_regs.fpregs[i+1]);
+        _LOG(tfd, only_in_tombstone, "    d%-2d %016llx  d%-2d %016llx\n",
+                i, vfp_regs.fpregs[i], i+1, vfp_regs.fpregs[i+1]);
     }
-    _LOG(tfd, only_in_tombstone, " scr %08lx\n\n", vfp_regs.fpscr);
+    _LOG(tfd, only_in_tombstone, "    scr %08lx\n\n", vfp_regs.fpscr);
 #endif
 }
+
+void dump_thread(ptrace_context_t* context, int tfd, pid_t tid, bool at_fault) {
+    dump_registers(context, tfd, tid, at_fault);
+
+    dump_backtrace_and_stack(context, tfd, tid, at_fault);
+
+    if (at_fault) {
+        dump_memory_and_code(tfd, tid, at_fault);
+        dump_nearby_maps(context, tfd, tid);
+    }
+}
diff --git a/debuggerd/arm/pr-support.c b/debuggerd/arm/pr-support.c
deleted file mode 100644
index 358d9b7..0000000
--- a/debuggerd/arm/pr-support.c
+++ /dev/null
@@ -1,345 +0,0 @@
-/* ARM EABI compliant unwinding routines
-   Copyright (C) 2004, 2005 Free Software Foundation, Inc.
-   Contributed by Paul Brook
- 
-   This file is free software; you can redistribute it and/or modify it
-   under the terms of the GNU General Public License as published by the
-   Free Software Foundation; either version 2, or (at your option) any
-   later version.
-
-   In addition to the permissions in the GNU General Public License, the
-   Free Software Foundation gives you unlimited permission to link the
-   compiled version of this file into combinations with other programs,
-   and to distribute those combinations without any restriction coming
-   from the use of this file.  (The General Public License restrictions
-   do apply in other respects; for example, they cover modification of
-   the file, and distribution when not linked into a combine
-   executable.)
-
-   This file is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   General Public License for more details.
-
-   You should have received a copy of the GNU General Public License
-   along with this program; see the file COPYING.  If not, write to
-   the Free Software Foundation, 51 Franklin Street, Fifth Floor,
-   Boston, MA 02110-1301, USA.  */
-
-/****************************************************************************
- * The functions here are derived from gcc/config/arm/pr-support.c from the 
- * 4.3.x release. The main changes here involve the use of ptrace to retrieve
- * memory/processor states from a remote process.
- ****************************************************************************/
-
-#include <sys/types.h>
-#include <unwind.h>
-
-#include "utility.h"
-
-/* We add a prototype for abort here to avoid creating a dependency on
-   target headers.  */
-extern void abort (void);
-
-/* Derived from _Unwind_VRS_Pop to use ptrace */
-extern _Unwind_VRS_Result 
-unwind_VRS_Pop_with_ptrace (_Unwind_Context *context, 
-                            _Unwind_VRS_RegClass regclass, 
-                            _uw discriminator, 
-                            _Unwind_VRS_DataRepresentation representation, 
-                            pid_t pid);
-
-typedef struct _ZSt9type_info type_info; /* This names C++ type_info type */
-
-/* Misc constants.  */
-#define R_IP    12
-#define R_SP    13
-#define R_LR    14
-#define R_PC    15
-
-#define uint32_highbit (((_uw) 1) << 31)
-
-void __attribute__((weak)) __cxa_call_unexpected(_Unwind_Control_Block *ucbp);
-
-/* Unwind descriptors.  */
-
-typedef struct
-{
-  _uw16 length;
-  _uw16 offset;
-} EHT16;
-
-typedef struct
-{
-  _uw length;
-  _uw offset;
-} EHT32;
-
-/* Personality routine helper functions.  */
-
-#define CODE_FINISH (0xb0)
-
-/* Derived from next_unwind_byte to use ptrace */
-/* Return the next byte of unwinding information, or CODE_FINISH if there is
-   no data remaining.  */
-static inline _uw8
-next_unwind_byte_with_ptrace (__gnu_unwind_state * uws, pid_t pid)
-{
-  _uw8 b;
-
-  if (uws->bytes_left == 0)
-    {
-      /* Load another word */
-      if (uws->words_left == 0)
-	return CODE_FINISH; /* Nothing left.  */
-      uws->words_left--;
-      uws->data = get_remote_word(pid, uws->next);
-      uws->next++;
-      uws->bytes_left = 3;
-    }
-  else
-    uws->bytes_left--;
-
-  /* Extract the most significant byte.  */
-  b = (uws->data >> 24) & 0xff;
-  uws->data <<= 8;
-  return b;
-}
-
-/* Execute the unwinding instructions described by UWS.  */
-_Unwind_Reason_Code
-unwind_execute_with_ptrace(_Unwind_Context * context, __gnu_unwind_state * uws,
-                           pid_t pid)
-{
-  _uw op;
-  int set_pc;
-  _uw reg;
-
-  set_pc = 0;
-  for (;;)
-    {
-      op = next_unwind_byte_with_ptrace (uws, pid);
-      if (op == CODE_FINISH)
-	{
-	  /* If we haven't already set pc then copy it from lr.  */
-	  if (!set_pc)
-	    {
-	      _Unwind_VRS_Get (context, _UVRSC_CORE, R_LR, _UVRSD_UINT32,
-			       &reg);
-	      _Unwind_VRS_Set (context, _UVRSC_CORE, R_PC, _UVRSD_UINT32,
-			       &reg);
-	      set_pc = 1;
-	    }
-	  /* Drop out of the loop.  */
-	  break;
-	}
-      if ((op & 0x80) == 0)
-	{
-	  /* vsp = vsp +- (imm6 << 2 + 4).  */
-	  _uw offset;
-
-	  offset = ((op & 0x3f) << 2) + 4;
-	  _Unwind_VRS_Get (context, _UVRSC_CORE, R_SP, _UVRSD_UINT32, &reg);
-	  if (op & 0x40)
-	    reg -= offset;
-	  else
-	    reg += offset;
-	  _Unwind_VRS_Set (context, _UVRSC_CORE, R_SP, _UVRSD_UINT32, &reg);
-	  continue;
-	}
-      
-      if ((op & 0xf0) == 0x80)
-	{
-	  op = (op << 8) | next_unwind_byte_with_ptrace (uws, pid);
-	  if (op == 0x8000)
-	    {
-	      /* Refuse to unwind.  */
-	      return _URC_FAILURE;
-	    }
-	  /* Pop r4-r15 under mask.  */
-	  op = (op << 4) & 0xfff0;
-	  if (unwind_VRS_Pop_with_ptrace (context, _UVRSC_CORE, op, _UVRSD_UINT32, 
-                                      pid)
-	      != _UVRSR_OK)
-	    return _URC_FAILURE;
-	  if (op & (1 << R_PC))
-	    set_pc = 1;
-	  continue;
-	}
-      if ((op & 0xf0) == 0x90)
-	{
-	  op &= 0xf;
-	  if (op == 13 || op == 15)
-	    /* Reserved.  */
-	    return _URC_FAILURE;
-	  /* vsp = r[nnnn].  */
-	  _Unwind_VRS_Get (context, _UVRSC_CORE, op, _UVRSD_UINT32, &reg);
-	  _Unwind_VRS_Set (context, _UVRSC_CORE, R_SP, _UVRSD_UINT32, &reg);
-	  continue;
-	}
-      if ((op & 0xf0) == 0xa0)
-	{
-	  /* Pop r4-r[4+nnn], [lr].  */
-	  _uw mask;
-	  
-	  mask = (0xff0 >> (7 - (op & 7))) & 0xff0;
-	  if (op & 8)
-	    mask |= (1 << R_LR);
-	  if (unwind_VRS_Pop_with_ptrace (context, _UVRSC_CORE, mask, _UVRSD_UINT32,
-                                      pid)
-	      != _UVRSR_OK)
-	    return _URC_FAILURE;
-	  continue;
-	}
-      if ((op & 0xf0) == 0xb0)
-	{
-	  /* op == 0xb0 already handled.  */
-	  if (op == 0xb1)
-	    {
-	      op = next_unwind_byte_with_ptrace (uws, pid);
-	      if (op == 0 || ((op & 0xf0) != 0))
-		/* Spare.  */
-		return _URC_FAILURE;
-	      /* Pop r0-r4 under mask.  */
-	      if (unwind_VRS_Pop_with_ptrace (context, _UVRSC_CORE, op, 
-                                          _UVRSD_UINT32, pid)
-		  != _UVRSR_OK)
-		return _URC_FAILURE;
-	      continue;
-	    }
-	  if (op == 0xb2)
-	    {
-	      /* vsp = vsp + 0x204 + (uleb128 << 2).  */
-	      int shift;
-
-	      _Unwind_VRS_Get (context, _UVRSC_CORE, R_SP, _UVRSD_UINT32,
-			       &reg);
-	      op = next_unwind_byte_with_ptrace (uws, pid);
-	      shift = 2;
-	      while (op & 0x80)
-		{
-		  reg += ((op & 0x7f) << shift);
-		  shift += 7;
-		  op = next_unwind_byte_with_ptrace (uws, pid);
-		}
-	      reg += ((op & 0x7f) << shift) + 0x204;
-	      _Unwind_VRS_Set (context, _UVRSC_CORE, R_SP, _UVRSD_UINT32,
-			       &reg);
-	      continue;
-	    }
-	  if (op == 0xb3)
-	    {
-	      /* Pop VFP registers with fldmx.  */
-	      op = next_unwind_byte_with_ptrace (uws, pid);
-	      op = ((op & 0xf0) << 12) | ((op & 0xf) + 1);
-	      if (unwind_VRS_Pop_with_ptrace (context, _UVRSC_VFP, op, _UVRSD_VFPX, 
-                                          pid)
-		  != _UVRSR_OK)
-		return _URC_FAILURE;
-	      continue;
-	    }
-	  if ((op & 0xfc) == 0xb4)
-	    {
-	      /* Pop FPA E[4]-E[4+nn].  */
-	      op = 0x40000 | ((op & 3) + 1);
-	      if (unwind_VRS_Pop_with_ptrace (context, _UVRSC_FPA, op, _UVRSD_FPAX, 
-                                          pid)
-		  != _UVRSR_OK)
-		return _URC_FAILURE;
-	      continue;
-	    }
-	  /* op & 0xf8 == 0xb8.  */
-	  /* Pop VFP D[8]-D[8+nnn] with fldmx.  */
-	  op = 0x80000 | ((op & 7) + 1);
-	  if (unwind_VRS_Pop_with_ptrace (context, _UVRSC_VFP, op, _UVRSD_VFPX, pid)
-	      != _UVRSR_OK)
-	    return _URC_FAILURE;
-	  continue;
-	}
-      if ((op & 0xf0) == 0xc0)
-	{
-	  if (op == 0xc6)
-	    {
-	      /* Pop iWMMXt D registers.  */
-	      op = next_unwind_byte_with_ptrace (uws, pid);
-	      op = ((op & 0xf0) << 12) | ((op & 0xf) + 1);
-	      if (unwind_VRS_Pop_with_ptrace (context, _UVRSC_WMMXD, op, 
-                                          _UVRSD_UINT64, pid)
-		  != _UVRSR_OK)
-		return _URC_FAILURE;
-	      continue;
-	    }
-	  if (op == 0xc7)
-	    {
-	      op = next_unwind_byte_with_ptrace (uws, pid);
-	      if (op == 0 || (op & 0xf0) != 0)
-		/* Spare.  */
-		return _URC_FAILURE;
-	      /* Pop iWMMXt wCGR{3,2,1,0} under mask.  */
-	      if (unwind_VRS_Pop_with_ptrace (context, _UVRSC_WMMXC, op, 
-                                          _UVRSD_UINT32, pid)
-		  != _UVRSR_OK)
-		return _URC_FAILURE;
-	      continue;
-	    }
-	  if ((op & 0xf8) == 0xc0)
-	    {
-	      /* Pop iWMMXt wR[10]-wR[10+nnn].  */
-	      op = 0xa0000 | ((op & 0xf) + 1);
-	      if (unwind_VRS_Pop_with_ptrace (context, _UVRSC_WMMXD, op, 
-                                          _UVRSD_UINT64, pid)
-		  != _UVRSR_OK)
-		return _URC_FAILURE;
-	      continue;
-	    }
-	  if (op == 0xc8)
-	    {
-#ifndef __VFP_FP__
- 	      /* Pop FPA registers.  */
- 	      op = next_unwind_byte_with_ptrace (uws, pid);
-	      op = ((op & 0xf0) << 12) | ((op & 0xf) + 1);
- 	      if (unwind_VRS_Pop_with_ptrace (context, _UVRSC_FPA, op, _UVRSD_FPAX,
-                                          pid)
- 		  != _UVRSR_OK)
- 		return _URC_FAILURE;
- 	      continue;
-#else
-              /* Pop VFPv3 registers D[16+ssss]-D[16+ssss+cccc] with vldm.  */
-              op = next_unwind_byte_with_ptrace (uws, pid);
-              op = (((op & 0xf0) + 16) << 12) | ((op & 0xf) + 1);
-              if (unwind_VRS_Pop_with_ptrace (context, _UVRSC_VFP, op, 
-                                              _UVRSD_DOUBLE, pid)
-                  != _UVRSR_OK)
-                return _URC_FAILURE;
-              continue;
-#endif
-	    }
-	  if (op == 0xc9)
-	    {
-	      /* Pop VFP registers with fldmd.  */
-	      op = next_unwind_byte_with_ptrace (uws, pid);
-	      op = ((op & 0xf0) << 12) | ((op & 0xf) + 1);
-	      if (unwind_VRS_Pop_with_ptrace (context, _UVRSC_VFP, op, 
-                                          _UVRSD_DOUBLE, pid)
-		  != _UVRSR_OK)
-		return _URC_FAILURE;
-	      continue;
-	    }
-	  /* Spare.  */
-	  return _URC_FAILURE;
-	}
-      if ((op & 0xf8) == 0xd0)
-	{
-	  /* Pop VFP D[8]-D[8+nnn] with fldmd.  */
-	  op = 0x80000 | ((op & 7) + 1);
-	  if (unwind_VRS_Pop_with_ptrace (context, _UVRSC_VFP, op, _UVRSD_DOUBLE, 
-                                      pid)
-	      != _UVRSR_OK)
-	    return _URC_FAILURE;
-	  continue;
-	}
-      /* Spare.  */
-      return _URC_FAILURE;
-    }
-  return _URC_OK;
-}
diff --git a/debuggerd/arm/unwind.c b/debuggerd/arm/unwind.c
deleted file mode 100644
index d9600b7..0000000
--- a/debuggerd/arm/unwind.c
+++ /dev/null
@@ -1,667 +0,0 @@
-/* ARM EABI compliant unwinding routines.
-   Copyright (C) 2004, 2005 Free Software Foundation, Inc.
-   Contributed by Paul Brook
-
-   This file is free software; you can redistribute it and/or modify it
-   under the terms of the GNU General Public License as published by the
-   Free Software Foundation; either version 2, or (at your option) any
-   later version.
-
-   In addition to the permissions in the GNU General Public License, the
-   Free Software Foundation gives you unlimited permission to link the
-   compiled version of this file into combinations with other programs,
-   and to distribute those combinations without any restriction coming
-   from the use of this file.  (The General Public License restrictions
-   do apply in other respects; for example, they cover modification of
-   the file, and distribution when not linked into a combine
-   executable.)
-
-   This file is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   General Public License for more details.
-
-   You should have received a copy of the GNU General Public License
-   along with this program; see the file COPYING.  If not, write to
-   the Free Software Foundation, 51 Franklin Street, Fifth Floor,
-   Boston, MA 02110-1301, USA.  */
-
-/****************************************************************************
- * The functions here are derived from gcc/config/arm/unwind-arm.c from the 
- * 4.3.x release. The main changes here involve the use of ptrace to retrieve
- * memory/processor states from a remote process.
- ****************************************************************************/
-
-#include <cutils/logd.h>
-#include <sys/ptrace.h>
-#include <unwind.h>
-#include "utility.h"
-
-#include "symbol_table.h"
-
-typedef struct _ZSt9type_info type_info; /* This names C++ type_info type */
-
-void __attribute__((weak)) __cxa_call_unexpected(_Unwind_Control_Block *ucbp);
-bool __attribute__((weak)) __cxa_begin_cleanup(_Unwind_Control_Block *ucbp);
-bool __attribute__((weak)) __cxa_type_match(_Unwind_Control_Block *ucbp,
-                        const type_info *rttip,
-                        bool is_reference,
-                        void **matched_object);
-
-/* Misc constants.  */
-#define R_IP	12
-#define R_SP	13
-#define R_LR	14
-#define R_PC	15
-
-#define EXIDX_CANTUNWIND 1
-#define uint32_highbit (((_uw) 1) << 31)
-
-#define UCB_FORCED_STOP_FN(ucbp) ((ucbp)->unwinder_cache.reserved1)
-#define UCB_PR_ADDR(ucbp) ((ucbp)->unwinder_cache.reserved2)
-#define UCB_SAVED_CALLSITE_ADDR(ucbp) ((ucbp)->unwinder_cache.reserved3)
-#define UCB_FORCED_STOP_ARG(ucbp) ((ucbp)->unwinder_cache.reserved4)
-
-struct core_regs
-{
-  _uw r[16];
-};
-
-/* We use normal integer types here to avoid the compiler generating
-   coprocessor instructions.  */
-struct vfp_regs
-{
-  _uw64 d[16];
-  _uw pad;
-};
-
-struct vfpv3_regs
-{
-  /* Always populated via VSTM, so no need for the "pad" field from
-     vfp_regs (which is used to store the format word for FSTMX).  */
-  _uw64 d[16];
-};
-
-struct fpa_reg
-{
-  _uw w[3];
-};
-
-struct fpa_regs
-{
-  struct fpa_reg f[8];
-};
-
-struct wmmxd_regs
-{
-  _uw64 wd[16];
-};
-
-struct wmmxc_regs
-{
-  _uw wc[4];
-};
-
-/* Unwind descriptors.  */
-
-typedef struct
-{
-  _uw16 length;
-  _uw16 offset;
-} EHT16;
-
-typedef struct
-{
-  _uw length;
-  _uw offset;
-} EHT32;
-
-/* The ABI specifies that the unwind routines may only use core registers,
-   except when actually manipulating coprocessor state.  This allows
-   us to write one implementation that works on all platforms by
-   demand-saving coprocessor registers.
-
-   During unwinding we hold the coprocessor state in the actual hardware
-   registers and allocate demand-save areas for use during phase1
-   unwinding.  */
-
-typedef struct
-{
-  /* The first fields must be the same as a phase2_vrs.  */
-  _uw demand_save_flags;
-  struct core_regs core;
-  _uw prev_sp; /* Only valid during forced unwinding.  */
-  struct vfp_regs vfp;
-  struct vfpv3_regs vfp_regs_16_to_31;
-  struct fpa_regs fpa;
-  struct wmmxd_regs wmmxd;
-  struct wmmxc_regs wmmxc;
-} phase1_vrs;
-
-/* This must match the structure created by the assembly wrappers.  */
-typedef struct
-{
-  _uw demand_save_flags;
-  struct core_regs core;
-} phase2_vrs;
-
-
-/* An exception index table entry.  */
-
-typedef struct __EIT_entry
-{
-  _uw fnoffset;
-  _uw content;
-} __EIT_entry;
-
-/* Derived version to use ptrace */
-typedef _Unwind_Reason_Code (*personality_routine_with_ptrace)
-           (_Unwind_State,
-			_Unwind_Control_Block *,
-			_Unwind_Context *,
-            pid_t);
-
-/* Derived version to use ptrace */
-/* ABI defined personality routines.  */
-static _Unwind_Reason_Code unwind_cpp_pr0_with_ptrace (_Unwind_State,
-    _Unwind_Control_Block *, _Unwind_Context *, pid_t);
-static _Unwind_Reason_Code unwind_cpp_pr1_with_ptrace (_Unwind_State,
-    _Unwind_Control_Block *, _Unwind_Context *, pid_t);
-static _Unwind_Reason_Code unwind_cpp_pr2_with_ptrace (_Unwind_State,
-    _Unwind_Control_Block *, _Unwind_Context *, pid_t);
-
-/* Execute the unwinding instructions described by UWS.  */
-extern _Unwind_Reason_Code
-unwind_execute_with_ptrace(_Unwind_Context * context, __gnu_unwind_state * uws,
-                           pid_t pid);
-
-/* Derived version to use ptrace. Only handles core registers. Disregards
- * FP and others. 
- */
-/* ABI defined function to pop registers off the stack.  */
-
-_Unwind_VRS_Result unwind_VRS_Pop_with_ptrace (_Unwind_Context *context,
-				    _Unwind_VRS_RegClass regclass,
-				    _uw discriminator,
-				    _Unwind_VRS_DataRepresentation representation,
-                    pid_t pid)
-{
-  phase1_vrs *vrs = (phase1_vrs *) context;
-
-  switch (regclass)
-    {
-    case _UVRSC_CORE:
-      {
-	_uw *ptr;
-	_uw mask;
-	int i;
-
-	if (representation != _UVRSD_UINT32)
-	  return _UVRSR_FAILED;
-
-	mask = discriminator & 0xffff;
-	ptr = (_uw *) vrs->core.r[R_SP];
-	/* Pop the requested registers.  */
-	for (i = 0; i < 16; i++)
-	  {
-	    if (mask & (1 << i)) {
-	      vrs->core.r[i] = get_remote_word(pid, ptr);
-          ptr++;
-        }
-	  }
-	/* Writeback the stack pointer value if it wasn't restored.  */
-	if ((mask & (1 << R_SP)) == 0)
-	  vrs->core.r[R_SP] = (_uw) ptr;
-      }
-      return _UVRSR_OK;
-
-    default:
-      return _UVRSR_FAILED;
-    }
-}
-
-/* Core unwinding functions.  */
-
-/* Calculate the address encoded by a 31-bit self-relative offset at address
-   P.  */
-static inline _uw
-selfrel_offset31 (const _uw *p, pid_t pid)
-{
-  _uw offset = get_remote_word(pid, (void*)p);
-
-  //offset = *p;
-  /* Sign extend to 32 bits.  */
-  if (offset & (1 << 30))
-    offset |= 1u << 31;
-  else
-    offset &= ~(1u << 31);
-
-  return offset + (_uw) p;
-}
-
-
-/* Perform a binary search for RETURN_ADDRESS in TABLE.  The table contains
-   NREC entries.  */
-
-static const __EIT_entry *
-search_EIT_table (const __EIT_entry * table, int nrec, _uw return_address,
-                  pid_t pid)
-{
-  _uw next_fn;
-  _uw this_fn;
-  int n, left, right;
-
-  if (nrec == 0)
-    return (__EIT_entry *) 0;
-
-  left = 0;
-  right = nrec - 1;
-
-  while (1)
-    {
-      n = (left + right) / 2;
-      this_fn = selfrel_offset31 (&table[n].fnoffset, pid);
-      if (n != nrec - 1)
-	next_fn = selfrel_offset31 (&table[n + 1].fnoffset, pid) - 1;
-      else
-	next_fn = (_uw)0 - 1;
-
-      if (return_address < this_fn)
-	{
-	  if (n == left)
-	    return (__EIT_entry *) 0;
-	  right = n - 1;
-	}
-      else if (return_address <= next_fn)
-	return &table[n];
-      else
-	left = n + 1;
-    }
-}
-
-/* Find the exception index table eintry for the given address. */
-static const __EIT_entry*
-get_eitp(_uw return_address, pid_t pid, mapinfo *map, mapinfo **containing_map)
-{
-  const __EIT_entry *eitp = NULL;
-  int nrec;
-  mapinfo *mi;
-  
-  /* The return address is the address of the instruction following the
-     call instruction (plus one in thumb mode).  If this was the last
-     instruction in the function the address will lie in the following
-     function.  Subtract 2 from the address so that it points within the call
-     instruction itself.  */
-  if (return_address >= 2)
-      return_address -= 2;
-
-  for (mi = map; mi != NULL; mi = mi->next) {
-    if (return_address >= mi->start && return_address <= mi->end) break;
-  }
-
-  if (mi) {
-    if (containing_map) *containing_map = mi;
-    eitp = (__EIT_entry *) mi->exidx_start;
-    nrec = (mi->exidx_end - mi->exidx_start)/sizeof(__EIT_entry);
-    eitp = search_EIT_table (eitp, nrec, return_address, pid);
-  }
-  return eitp;
-}
-
-/* Find the exception index table eintry for the given address.
-   Fill in the relevant fields of the UCB.
-   Returns _URC_FAILURE if an error occurred, _URC_OK on success.  */
-
-static _Unwind_Reason_Code
-get_eit_entry (_Unwind_Control_Block *ucbp, _uw return_address, pid_t pid, 
-               mapinfo *map, mapinfo **containing_map)
-{
-  const __EIT_entry *eitp;
-  
-  eitp = get_eitp(return_address, pid, map, containing_map);
-
-  if (!eitp)
-    {
-      UCB_PR_ADDR (ucbp) = 0;
-      return _URC_FAILURE;
-    }
-  ucbp->pr_cache.fnstart = selfrel_offset31 (&eitp->fnoffset, pid);
-
-  _uw eitp_content = get_remote_word(pid, (void *)&eitp->content);
-
-  /* Can this frame be unwound at all?  */
-  if (eitp_content == EXIDX_CANTUNWIND)
-    {
-      UCB_PR_ADDR (ucbp) = 0;
-      return _URC_END_OF_STACK;
-    }
-
-  /* Obtain the address of the "real" __EHT_Header word.  */
-
-  if (eitp_content & uint32_highbit)
-    {
-      /* It is immediate data.  */
-      ucbp->pr_cache.ehtp = (_Unwind_EHT_Header *)&eitp->content;
-      ucbp->pr_cache.additional = 1;
-    }
-  else
-    {
-      /* The low 31 bits of the content field are a self-relative
-	 offset to an _Unwind_EHT_Entry structure.  */
-      ucbp->pr_cache.ehtp =
-	(_Unwind_EHT_Header *) selfrel_offset31 (&eitp->content, pid);
-      ucbp->pr_cache.additional = 0;
-    }
-
-  /* Discover the personality routine address.  */
-  if (get_remote_word(pid, ucbp->pr_cache.ehtp) & (1u << 31))
-    {
-      /* One of the predefined standard routines.  */
-      _uw idx = (get_remote_word(pid, ucbp->pr_cache.ehtp) >> 24) & 0xf;
-      if (idx == 0)
-	UCB_PR_ADDR (ucbp) = (_uw) &unwind_cpp_pr0_with_ptrace;
-      else if (idx == 1)
-	UCB_PR_ADDR (ucbp) = (_uw) &unwind_cpp_pr1_with_ptrace;
-      else if (idx == 2)
-	UCB_PR_ADDR (ucbp) = (_uw) &unwind_cpp_pr2_with_ptrace;
-      else
-	{ /* Failed */
-	  UCB_PR_ADDR (ucbp) = 0;
-	  return _URC_FAILURE;
-	}
-    } 
-  else
-    {
-      /* Execute region offset to PR */
-      UCB_PR_ADDR (ucbp) = selfrel_offset31 (ucbp->pr_cache.ehtp, pid);
-      /* Since we are unwinding the stack from a different process, it is
-       * impossible to execute the personality routine in debuggerd. Punt here.
-       */
-	  return _URC_FAILURE;
-    }
-  return _URC_OK;
-}
-
-/* Print out the current call level, pc, and module name in the crash log */
-static _Unwind_Reason_Code log_function(_Unwind_Context *context, pid_t pid, 
-                                        int tfd,
-                                        int stack_level,
-                                        mapinfo *map,
-                                        unsigned int sp_list[],
-                                        bool at_fault)
-{
-    _uw pc;
-    _uw rel_pc; 
-    phase2_vrs *vrs = (phase2_vrs*) context;
-    const mapinfo *mi;
-    bool only_in_tombstone = !at_fault;
-    const struct symbol* sym = 0;
-
-    if (stack_level < STACK_CONTENT_DEPTH) {
-        sp_list[stack_level] = vrs->core.r[R_SP];
-    }
-    pc = vrs->core.r[R_PC];
-
-    // Top level frame
-    if (stack_level == 0) {
-        pc &= ~1;
-    }
-    // For deeper framers, rollback pc by one instruction
-    else {
-        pc = vrs->core.r[R_PC];
-        /* Thumb mode - need to check whether the bl(x) has long offset or not.
-         * Examples:
-         *
-         * arm blx in the middle of thumb:
-         * 187ae:       2300            movs    r3, #0
-         * 187b0:       f7fe ee1c       blx     173ec
-         * 187b4:       2c00            cmp     r4, #0
-         *
-         * arm bl in the middle of thumb:
-         * 187d8:       1c20            adds    r0, r4, #0
-         * 187da:       f136 fd15       bl      14f208
-         * 187de:       2800            cmp     r0, #0
-         *
-         * pure thumb:
-         * 18894:       189b            adds    r3, r3, r2
-         * 18896:       4798            blx     r3
-         * 18898:       b001            add     sp, #4
-         */
-        if (pc & 1) {
-            _uw prev_word;
-            pc = (pc & ~1);
-            prev_word = get_remote_word(pid, (char *) pc-4);
-            // Long offset 
-            if ((prev_word & 0xf0000000) == 0xf0000000 && 
-                (prev_word & 0x0000e000) == 0x0000e000) {
-                pc -= 4;
-            }
-            else {
-                pc -= 2;
-            }
-        }
-        else { 
-            pc -= 4;
-        }
-    }
-
-    /* We used to print the absolute PC in the back trace, and mask out the top
-     * 3 bits to guesstimate the offset in the .so file. This is not working for
-     * non-prelinked libraries since the starting offset may not be aligned on 
-     * 1MB boundaries, and the library may be larger than 1MB. So for .so 
-     * addresses we print the relative offset in back trace.
-     */
-    mi = pc_to_mapinfo(map, pc, &rel_pc);
-
-    /* See if we can determine what symbol this stack frame resides in */
-    if (mi != 0 && mi->symbols != 0) {
-        sym = symbol_table_lookup(mi->symbols, rel_pc);
-    }
-
-    if (sym) {
-        _LOG(tfd, only_in_tombstone,
-            "         #%02d  pc %08x  %s (%s)\n", stack_level, rel_pc,
-            mi ? mi->name : "", sym->name);
-    } else {
-        _LOG(tfd, only_in_tombstone,
-            "         #%02d  pc %08x  %s\n", stack_level, rel_pc,
-            mi ? mi->name : "");
-    }
-
-    return _URC_NO_REASON;
-}
-
-/* Derived from __gnu_Unwind_Backtrace to use ptrace */
-/* Perform stack backtrace through unwind data. Return the level of stack it
- * unwinds.
- */
-int unwind_backtrace_with_ptrace(int tfd, pid_t pid, mapinfo *map, 
-                                 unsigned int sp_list[], int *frame0_pc_sane,
-                                 bool at_fault)
-{
-    phase1_vrs saved_vrs;
-    _Unwind_Reason_Code code = _URC_OK;
-    struct pt_regs r;
-    int i;
-    int stack_level = 0;
-
-    _Unwind_Control_Block ucb;
-    _Unwind_Control_Block *ucbp = &ucb;
-
-    if(ptrace(PTRACE_GETREGS, pid, 0, &r)) return 0;
-
-    for (i = 0; i < 16; i++) {
-        saved_vrs.core.r[i] = r.uregs[i];
-        /*
-        _LOG(tfd, "r[%d] = 0x%x\n", i, saved_vrs.core.r[i]);
-        */
-    }
-
-    /* Set demand-save flags.  */
-    saved_vrs.demand_save_flags = ~(_uw) 0;
-
-    /* 
-     * If the app crashes because of calling the weeds, we cannot pass the PC 
-     * to the usual unwinding code as the EXIDX mapping will fail. 
-     * Instead, we simply print out the 0 as the top frame, and resume the 
-     * unwinding process with the value stored in LR.
-     */
-    if (get_eitp(saved_vrs.core.r[R_PC], pid, map, NULL) == NULL) { 
-        *frame0_pc_sane = 0;
-        log_function ((_Unwind_Context *) &saved_vrs, pid, tfd, stack_level, 
-                      map, sp_list, at_fault);
-        saved_vrs.core.r[R_PC] = saved_vrs.core.r[R_LR];
-        stack_level++;
-    }
-
-    do {
-        mapinfo *this_map = NULL;
-        /* Find the entry for this routine.  */
-        if (get_eit_entry(ucbp, saved_vrs.core.r[R_PC], pid, map, &this_map)
-            != _URC_OK) {
-            /* Uncomment the code below to study why the unwinder failed */
-#if 0
-            /* Shed more debugging info for stack unwinder improvement */
-            if (this_map) {
-                _LOG(tfd, 1, 
-                     "Relative PC=%#x from %s not contained in EXIDX\n", 
-                     saved_vrs.core.r[R_PC] - this_map->start, this_map->name);
-            }
-            _LOG(tfd, 1, "PC=%#x SP=%#x\n", 
-                 saved_vrs.core.r[R_PC], saved_vrs.core.r[R_SP]);
-#endif
-            code = _URC_FAILURE;
-            break;
-        }
-
-        /* The dwarf unwinder assumes the context structure holds things
-        like the function and LSDA pointers.  The ARM implementation
-        caches these in the exception header (UCB).  To avoid
-        rewriting everything we make the virtual IP register point at
-        the UCB.  */
-        _Unwind_SetGR((_Unwind_Context *)&saved_vrs, 12, (_Unwind_Ptr) ucbp);
-
-        /* Call log function.  */
-        if (log_function ((_Unwind_Context *) &saved_vrs, pid, tfd, stack_level,
-                          map, sp_list, at_fault) != _URC_NO_REASON) {
-            code = _URC_FAILURE;
-            break;
-        }
-        stack_level++;
-
-        /* Call the pr to decide what to do.  */
-        code = ((personality_routine_with_ptrace) UCB_PR_ADDR (ucbp))(
-                _US_VIRTUAL_UNWIND_FRAME | _US_FORCE_UNWIND, ucbp, 
-                (void *) &saved_vrs, pid);
-    /* 
-     * In theory the unwinding process will stop when the end of stack is
-     * reached or there is no unwinding information for the code address.
-     * To add another level of guarantee that the unwinding process
-     * will terminate we will stop it when the STACK_CONTENT_DEPTH is reached.
-     */
-    } while (code != _URC_END_OF_STACK && code != _URC_FAILURE && 
-             stack_level < STACK_CONTENT_DEPTH);
-    return stack_level;
-}
-
-
-/* Derived version to use ptrace */
-/* Common implementation for ARM ABI defined personality routines.
-   ID is the index of the personality routine, other arguments are as defined
-   by __aeabi_unwind_cpp_pr{0,1,2}.  */
-
-static _Unwind_Reason_Code
-unwind_pr_common_with_ptrace (_Unwind_State state,
-			_Unwind_Control_Block *ucbp,
-			_Unwind_Context *context,
-			int id,
-            pid_t pid)
-{
-  __gnu_unwind_state uws;
-  _uw *data;
-  int phase2_call_unexpected_after_unwind = 0;
-
-  state &= _US_ACTION_MASK;
-
-  data = (_uw *) ucbp->pr_cache.ehtp;
-  uws.data = get_remote_word(pid, data);
-  data++;
-  uws.next = data;
-  if (id == 0)
-    {
-      uws.data <<= 8;
-      uws.words_left = 0;
-      uws.bytes_left = 3;
-    }
-  else
-    {
-      uws.words_left = (uws.data >> 16) & 0xff;
-      uws.data <<= 16;
-      uws.bytes_left = 2;
-      data += uws.words_left;
-    }
-
-  /* Restore the saved pointer.  */
-  if (state == _US_UNWIND_FRAME_RESUME)
-    data = (_uw *) ucbp->cleanup_cache.bitpattern[0];
-
-  if ((ucbp->pr_cache.additional & 1) == 0)
-    {
-      /* Process descriptors.  */
-      while (get_remote_word(pid, data)) {
-      /**********************************************************************
-       * The original code here seems to deal with exceptions that are not
-       * applicable in our toolchain, thus there is no way to test it for now.
-       * Instead of leaving it here and causing potential instability in
-       * debuggerd, we'd better punt here and leave the stack unwound.
-       * In the future when we discover cases where the stack should be unwound
-       * further but is not, we can revisit the code here.
-       **********************************************************************/
-        return _URC_FAILURE;
-	  }
-	  /* Finished processing this descriptor.  */
-    }
-
-  if (unwind_execute_with_ptrace (context, &uws, pid) != _URC_OK)
-    return _URC_FAILURE;
-
-  if (phase2_call_unexpected_after_unwind)
-    {
-      /* Enter __cxa_unexpected as if called from the call site.  */
-      _Unwind_SetGR (context, R_LR, _Unwind_GetGR (context, R_PC));
-      _Unwind_SetGR (context, R_PC, (_uw) &__cxa_call_unexpected);
-      return _URC_INSTALL_CONTEXT;
-    }
-
-  return _URC_CONTINUE_UNWIND;
-}
-
-
-/* ABI defined personality routine entry points.  */
-
-static _Unwind_Reason_Code
-unwind_cpp_pr0_with_ptrace (_Unwind_State state,
-			_Unwind_Control_Block *ucbp,
-			_Unwind_Context *context,
-            pid_t pid)
-{
-  return unwind_pr_common_with_ptrace (state, ucbp, context, 0, pid);
-}
-
-static _Unwind_Reason_Code
-unwind_cpp_pr1_with_ptrace (_Unwind_State state,
-			_Unwind_Control_Block *ucbp,
-			_Unwind_Context *context,
-            pid_t pid)
-{
-  return unwind_pr_common_with_ptrace (state, ucbp, context, 1, pid);
-}
-
-static _Unwind_Reason_Code
-unwind_cpp_pr2_with_ptrace (_Unwind_State state,
-			_Unwind_Control_Block *ucbp,
-			_Unwind_Context *context,
-            pid_t pid)
-{
-  return unwind_pr_common_with_ptrace (state, ucbp, context, 2, pid);
-}