diff --git a/debuggerd/Android.mk b/debuggerd/Android.mk
index 244edb0..752c953 100644
--- a/debuggerd/Android.mk
+++ b/debuggerd/Android.mk
@@ -1,6 +1,6 @@
 # Copyright 2005 The Android Open Source Project
 
-ifeq ($(TARGET_ARCH),arm)
+ifneq ($(filter arm x86,$(TARGET_ARCH)),)
 
 LOCAL_PATH:= $(call my-dir)
 include $(CLEAR_VARS)
@@ -50,4 +50,4 @@
 include $(BUILD_EXECUTABLE)
 endif # ARCH_ARM_HAVE_VFP == true
 
-endif # TARGET_ARCH == arm
+endif # arm or x86 in TARGET_ARCH
diff --git a/debuggerd/arm/unwind.c b/debuggerd/arm/unwind.c
index d191310..d9600b7 100644
--- a/debuggerd/arm/unwind.c
+++ b/debuggerd/arm/unwind.c
@@ -451,7 +451,6 @@
      * 1MB boundaries, and the library may be larger than 1MB. So for .so 
      * addresses we print the relative offset in back trace.
      */
-    rel_pc = pc;
     mi = pc_to_mapinfo(map, pc, &rel_pc);
 
     /* See if we can determine what symbol this stack frame resides in */
diff --git a/debuggerd/debuggerd.c b/debuggerd/debuggerd.c
index 374a9a5..ecfe01f 100644
--- a/debuggerd/debuggerd.c
+++ b/debuggerd/debuggerd.c
@@ -286,6 +286,13 @@
     }
 
     dump_stack_and_code(tfd, tid, milist, stack_depth, sp_list, at_fault);
+#elif __i386__
+    /* If stack unwinder fails, use the default solution to dump the stack
+    * content.
+    */
+    stack_depth = unwind_backtrace_with_ptrace_x86(tfd, tid, milist,at_fault);
+#else
+#error "Unsupported architecture"
 #endif
 
     while(milist) {
diff --git a/debuggerd/debuggerd.h b/debuggerd/debuggerd.h
index 01736bd..e3cdc7c 100644
--- a/debuggerd/debuggerd.h
+++ b/debuggerd/debuggerd.h
@@ -37,4 +37,3 @@
 void dump_stack_and_code(int tfd, int pid, mapinfo *map,
                          int unwind_depth, unsigned int sp_list[],
                          bool at_fault);
-
diff --git a/debuggerd/symbol_table.c b/debuggerd/symbol_table.c
index 150c058..e76df33 100644
--- a/debuggerd/symbol_table.c
+++ b/debuggerd/symbol_table.c
@@ -5,6 +5,7 @@
 #include <sys/mman.h>
 
 #include "symbol_table.h"
+#include "utility.h"
 
 #include <linux/elf.h>
 
@@ -49,6 +50,7 @@
     int length;
     char *base;
 
+    XLOG("Creating symbol table for %s\n", filename);
     int fd = open(filename, O_RDONLY);
 
     if(fd < 0) {
@@ -69,40 +71,70 @@
     Elf32_Shdr *shdr = (Elf32_Shdr*)(base + hdr->e_shoff);
 
     // Search for the dynamic symbols section
+    int sym_idx = -1;
     int dynsym_idx = -1;
     int i;
 
     for(i = 0; i < hdr->e_shnum; i++) {
+        if(shdr[i].sh_type == SHT_SYMTAB ) {
+            sym_idx = i;
+        }
         if(shdr[i].sh_type == SHT_DYNSYM ) {
             dynsym_idx = i;
         }
     }
-
-    if(dynsym_idx == -1) {
+    if ((dynsym_idx == -1) && (sym_idx == -1)) {
         goto out_unmap;
     }
 
-    Elf32_Sym *dynsyms = (Elf32_Sym*)(base + shdr[dynsym_idx].sh_offset);
-    int numsyms = shdr[dynsym_idx].sh_size / shdr[dynsym_idx].sh_entsize;
-
     table = malloc(sizeof(struct symbol_table));
     if(!table) {
         goto out_unmap;
     }
+    table->name = strdup(filename);
     table->num_symbols = 0;
 
-    // Iterate through the dynamic symbol table, and count how many symbols
-    // are actually defined
-    for(i = 0; i < numsyms; i++) {
-        if(dynsyms[i].st_shndx != SHN_UNDEF) {
-            table->num_symbols++;
-        }
-    }
+    Elf32_Sym *dynsyms = (Elf32_Sym*)(base + shdr[dynsym_idx].sh_offset);
+    Elf32_Sym *syms = (Elf32_Sym*)(base + shdr[sym_idx].sh_offset);
+
+    int dynnumsyms = shdr[dynsym_idx].sh_size / shdr[dynsym_idx].sh_entsize;
+    int numsyms = shdr[sym_idx].sh_size / shdr[sym_idx].sh_entsize;
 
     int dynstr_idx = shdr[dynsym_idx].sh_link;
+    int str_idx = shdr[sym_idx].sh_link;
+
     char *dynstr = base + shdr[dynstr_idx].sh_offset;
+    char *str = base + shdr[str_idx].sh_offset;
+
+    int symbol_count = 0;
+    int dynsymbol_count = 0;
+
+    if (dynsym_idx != -1) {
+        // Iterate through the dynamic symbol table, and count how many symbols
+        // are actually defined
+        for(i = 0; i < dynnumsyms; i++) {
+            if(dynsyms[i].st_shndx != SHN_UNDEF) {
+                dynsymbol_count++;
+            }
+        }
+        XLOG("Dynamic Symbol count: %d\n", dynsymbol_count);
+    }
+
+    if (sym_idx != -1) {
+        // Iterate through the symbol table, and count how many symbols
+        // are actually defined
+        for(i = 0; i < numsyms; i++) {
+            if((syms[i].st_shndx != SHN_UNDEF) &&
+                (strlen(str+syms[i].st_name)) &&
+                (syms[i].st_value != 0) && (syms[i].st_size != 0)) {
+                symbol_count++;
+            }
+        }
+        XLOG("Symbol count: %d\n", symbol_count);
+    }
 
     // Now, create an entry in our symbol table structure for each symbol...
+    table->num_symbols += symbol_count + dynsymbol_count;;
     table->symbols = malloc(table->num_symbols * sizeof(struct symbol));
     if(!table->symbols) {
         free(table);
@@ -110,14 +142,35 @@
         goto out_unmap;
     }
 
-    // ...and populate them
+
     int j = 0;
-    for(i = 0; i < numsyms; i++) {
-        if(dynsyms[i].st_shndx != SHN_UNDEF) {
-            table->symbols[j].name = strdup(dynstr + dynsyms[i].st_name);
-            table->symbols[j].addr = dynsyms[i].st_value;
-            table->symbols[j].size = dynsyms[i].st_size;
-            j++;
+    if (dynsym_idx != -1) {
+        // ...and populate them
+        for(i = 0; i < dynnumsyms; i++) {
+            if(dynsyms[i].st_shndx != SHN_UNDEF) {
+                table->symbols[j].name = strdup(dynstr + dynsyms[i].st_name);
+                table->symbols[j].addr = dynsyms[i].st_value;
+                table->symbols[j].size = dynsyms[i].st_size;
+                XLOG("name: %s, addr: %x, size: %x\n",
+                    table->symbols[j].name, table->symbols[j].addr, table->symbols[j].size);
+                j++;
+            }
+        }
+    }
+
+    if (sym_idx != -1) {
+        // ...and populate them
+        for(i = 0; i < numsyms; i++) {
+            if((syms[i].st_shndx != SHN_UNDEF) &&
+                (strlen(str+syms[i].st_name)) &&
+                (syms[i].st_value != 0) && (syms[i].st_size != 0)) {
+                table->symbols[j].name = strdup(str + syms[i].st_name);
+                table->symbols[j].addr = syms[i].st_value;
+                table->symbols[j].size = syms[i].st_size;
+                XLOG("name: %s, addr: %x, size: %x\n",
+                    table->symbols[j].name, table->symbols[j].addr, table->symbols[j].size);
+                j++;
+            }
         }
     }
 
diff --git a/debuggerd/symbol_table.h b/debuggerd/symbol_table.h
index d9d2520..7f41f91 100644
--- a/debuggerd/symbol_table.h
+++ b/debuggerd/symbol_table.h
@@ -10,6 +10,7 @@
 struct symbol_table {
     struct symbol *symbols;
     int num_symbols;
+    char *name;
 };
 
 struct symbol_table *symbol_table_create(const char *filename);
diff --git a/debuggerd/utility.c b/debuggerd/utility.c
index a9cbef7..2afdb46 100644
--- a/debuggerd/utility.c
+++ b/debuggerd/utility.c
@@ -69,11 +69,12 @@
 /* Find the containing map info for the pc */
 const mapinfo *pc_to_mapinfo(mapinfo *mi, unsigned pc, unsigned *rel_pc)
 {
+    *rel_pc = pc;
     while(mi) {
         if((pc >= mi->start) && (pc < mi->end)){
             // Only calculate the relative offset for shared libraries
             if (strstr(mi->name, ".so")) {
-                *rel_pc = pc - mi->start;
+                *rel_pc -= mi->start;
             }
             return mi;
         }
diff --git a/debuggerd/x86/crashglue.S b/debuggerd/x86/crashglue.S
new file mode 100644
index 0000000..59df432
--- /dev/null
+++ b/debuggerd/x86/crashglue.S
@@ -0,0 +1,15 @@
+.globl crash1
+.globl crashnostack
+
+crash1:
+	movl $0xa5a50000, %eax
+	movl $0xa5a50001, %ebx
+	movl $0xa5a50002, %ecx
+
+	movl $0, %edx
+	jmp *%edx
+
+
+crashnostack:
+	movl $0, %ebp
+	jmp *%ebp
diff --git a/debuggerd/x86/machine.c b/debuggerd/x86/machine.c
new file mode 100644
index 0000000..9d418cf
--- /dev/null
+++ b/debuggerd/x86/machine.c
@@ -0,0 +1,61 @@
+/* system/debuggerd/debuggerd.c
+**
+** Copyright 2006, 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 <stdio.h>
+#include <errno.h>
+#include <signal.h>
+#include <pthread.h>
+#include <fcntl.h>
+#include <sys/types.h>
+#include <dirent.h>
+
+#include <sys/ptrace.h>
+#include <sys/wait.h>
+#include <sys/exec_elf.h>
+#include <sys/stat.h>
+
+#include <cutils/sockets.h>
+#include <cutils/properties.h>
+
+#include <linux/input.h>
+
+#include "../utility.h"
+#include "x86_utility.h"
+
+void dump_registers(int tfd, int pid, bool at_fault)
+{
+    struct pt_regs_x86 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));
+        return;
+    }
+//if there is no stack, no print just like arm
+    if(!r.ebp)
+        return;
+    _LOG(tfd, only_in_tombstone, " eax %08x  ebx %08x  ecx %08x  edx %08x\n",
+         r.eax, r.ebx, r.ecx, r.edx);
+    _LOG(tfd, only_in_tombstone, " esi %08x  edi %08x\n",
+         r.esi, r.edi);
+    _LOG(tfd, only_in_tombstone, " xcs %08x  xds %08x  xes %08x  xfs %08x xss %08x\n",
+         r.xcs, r.xds, r.xes, r.xfs, r.xss);
+    _LOG(tfd, only_in_tombstone,
+         " eip %08x  ebp %08x  esp %08x  flags %08x\n",
+         r.eip, r.ebp, r.esp, r.eflags);
+}
diff --git a/debuggerd/x86/unwind.c b/debuggerd/x86/unwind.c
new file mode 100644
index 0000000..8f84e01
--- /dev/null
+++ b/debuggerd/x86/unwind.c
@@ -0,0 +1,85 @@
+#include <cutils/logd.h>
+#include <sys/ptrace.h>
+#include "../utility.h"
+#include "x86_utility.h"
+
+
+int unwind_backtrace_with_ptrace_x86(int tfd, pid_t pid, mapinfo *map,
+                                 bool at_fault)
+{
+    struct pt_regs_x86 r;
+    unsigned int stack_level = 0;
+    unsigned int stack_depth = 0;
+    unsigned int rel_pc;
+    unsigned int stack_ptr;
+    unsigned int stack_content;
+
+    if(ptrace(PTRACE_GETREGS, pid, 0, &r)) return 0;
+    unsigned int eip = (unsigned int)r.eip;
+    unsigned int ebp = (unsigned int)r.ebp;
+    unsigned int cur_sp = (unsigned int)r.esp;
+    const mapinfo *mi;
+    const struct symbol* sym = 0;
+
+
+//ebp==0, it indicates that the stack is poped to the bottom or there is no stack at all.
+    while (ebp) {
+        _LOG(tfd, !at_fault, "#0%d ",stack_level);
+        mi = pc_to_mapinfo(map, eip, &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, !at_fault, "    eip: %08x  %s (%s)\n", eip, mi ? mi->name : "", sym->name);
+        } else {
+            _LOG(tfd, !at_fault, "    eip: %08x  %s\n", eip, mi ? mi->name : "");
+        }
+
+        stack_level++;
+        if (stack_level >= STACK_DEPTH || eip == 0)
+            break;
+        eip = ptrace(PTRACE_PEEKTEXT, pid, (void*)(ebp + 4), NULL);
+        ebp = ptrace(PTRACE_PEEKTEXT, pid, (void*)ebp, NULL);
+    }
+    ebp = (unsigned int)r.ebp;
+    stack_depth = stack_level;
+    stack_level = 0;
+    if (ebp)
+        _LOG(tfd, !at_fault, "stack: \n");
+    while (ebp) {
+        _LOG(tfd, !at_fault, "#0%d \n",stack_level);
+        stack_ptr = cur_sp;
+        while((int)(ebp - stack_ptr) >= 0) {
+            stack_content = ptrace(PTRACE_PEEKTEXT, pid, (void*)stack_ptr, NULL);
+            mi = pc_to_mapinfo(map, stack_content, &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, !at_fault, "    %08x  %08x  %s (%s)\n",
+                    stack_ptr, stack_content, mi ? mi->name : "", sym->name);
+            } else {
+                _LOG(tfd, !at_fault, "    %08x  %08x  %s\n", stack_ptr, stack_content, mi ? mi->name : "");
+            }
+
+            stack_ptr = stack_ptr + 4;
+            //the stack frame may be very deep.
+            if((int)(stack_ptr - cur_sp) >= STACK_FRAME_DEPTH) {
+                _LOG(tfd, !at_fault, "    ......  ......  \n");
+                break;
+            }
+        }
+        cur_sp = ebp + 4;
+        stack_level++;
+        if (stack_level >= STACK_DEPTH || stack_level >= stack_depth)
+            break;
+        ebp = ptrace(PTRACE_PEEKTEXT, pid, (void*)ebp, NULL);
+    }
+
+    return stack_depth;
+}
+
diff --git a/debuggerd/x86/x86_utility.h b/debuggerd/x86/x86_utility.h
new file mode 100644
index 0000000..ac6a885
--- /dev/null
+++ b/debuggerd/x86/x86_utility.h
@@ -0,0 +1,40 @@
+/*
+**
+** Copyright 2006, 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.
+*/
+
+#define STACK_DEPTH 8
+#define STACK_FRAME_DEPTH 64
+
+typedef struct pt_regs_x86 {
+    long ebx;
+    long ecx;
+    long edx;
+    long esi;
+    long edi;
+    long ebp;
+    long eax;
+    int  xds;
+    int  xes;
+    int  xfs;
+    int  xgs;
+    long orig_eax;
+    long eip;
+    int  xcs;
+    long eflags;
+    long esp;
+    int  xss;
+}pt_regs_x86;
+