diff --git a/libc/tools/gensyscalls.py b/libc/tools/gensyscalls.py
new file mode 100755
index 0000000..37e356d
--- /dev/null
+++ b/libc/tools/gensyscalls.py
@@ -0,0 +1,451 @@
+#!/usr/bin/python
+#
+# this tool is used to generate the syscall assmbler templates
+# to be placed into arch-x86/syscalls, as well as the content
+# of arch-x86/linux/_syscalls.h
+#
+
+import sys, os.path, glob, re, string, commands, filecmp, shutil
+
+from bionic_utils import *
+
+# set this to 1 if you want to generate thumb stubs
+gen_thumb_stubs = 0
+
+# set this to 1 if you want to generate ARM EABI stubs
+gen_eabi_stubs = 1
+
+# get the root Bionic directory, simply this script's dirname
+#
+bionic_root = find_bionic_root()
+if not bionic_root:
+    print "could not find the Bionic root directory. aborting"
+    sys.exit(1)
+
+if bionic_root[-1] != '/':
+    bionic_root += "/"
+
+print "bionic_root is %s" % bionic_root
+
+# temp directory where we store all intermediate files
+bionic_temp = "/tmp/bionic_gensyscalls/"
+
+# all architectures, update as you see fit
+all_archs = [ "arm", "x86" ]
+
+def make_dir( path ):
+    if not os.path.exists(path):
+        parent = os.path.dirname(path)
+        if parent:
+            make_dir(parent)
+        os.mkdir(path)
+
+def create_file( relpath ):
+    dir = os.path.dirname( bionic_temp + relpath )
+    make_dir(dir)
+    return open( bionic_temp + relpath, "w" )
+
+# x86 assembler templates for each syscall stub
+#
+
+x86_header = """/* autogenerated by gensyscalls.py */
+#include <sys/linux-syscalls.h>
+
+    .text
+    .type %(fname)s, @function
+    .globl %(fname)s
+    .align 4
+
+%(fname)s:
+"""
+
+x86_registers = [ "%ebx", "%ecx", "%edx", "%esi", "%edi", "%ebp" ]
+
+x86_call = """    movl    $%(idname)s, %%eax
+    int     $0x80
+    cmpl    $-129, %%eax
+    jb      1f
+    negl    %%eax
+    pushl   %%eax
+    call    __set_errno
+    addl    $4, %%esp
+    orl     $-1, %%eax
+1:
+"""
+
+x86_return = """    ret
+"""
+
+# ARM assembler templates for each syscall stub
+#
+arm_header = """/* autogenerated by gensyscalls.py */
+#include <sys/linux-syscalls.h>
+
+    .text
+    .type %(fname)s, #function
+    .globl %(fname)s
+    .align 4
+    .fnstart
+
+%(fname)s:
+"""
+
+arm_call_default = arm_header + """\
+    swi   #%(idname)s
+    movs    r0, r0
+    bxpl    lr
+    b       __set_syscall_errno
+    .fnend
+"""
+
+arm_call_long = arm_header + """\
+    .save   {r4, r5, lr}
+    stmfd   sp!, {r4, r5, lr}
+    ldr     r4, [sp, #12]
+    ldr     r5, [sp, #16]
+    swi     # %(idname)s
+    ldmfd   sp!, {r4, r5, lr}
+    movs    r0, r0
+    bxpl    lr
+    b       __set_syscall_errno
+    .fnend
+"""
+
+arm_eabi_call_default = arm_header + """\
+    .save   {r4, r7}
+    stmfd   sp!, {r4, r7}
+    ldr     r7, =%(idname)s
+    swi     #0
+    ldmfd   sp!, {r4, r7}
+    movs    r0, r0
+    bxpl    lr
+    b       __set_syscall_errno
+    .fnend
+"""
+
+arm_eabi_call_long = arm_header + """\
+    mov     ip, sp
+    .save   {r4, r5, r6, r7}
+    stmfd   sp!, {r4, r5, r6, r7}
+    ldmfd   ip, {r4, r5, r6}
+    ldr     r7, =%(idname)s
+    swi     #0
+    ldmfd   sp!, {r4, r5, r6, r7}
+    movs    r0, r0
+    bxpl    lr
+    b       __set_syscall_errno
+    .fnend
+"""
+
+# ARM thumb assembler templates for each syscall stub
+#
+thumb_header = """/* autogenerated by gensyscalls.py */
+    .text
+    .type %(fname)s, #function
+    .globl %(fname)s
+    .align 4
+    .thumb_func
+    .fnstart
+
+#define  __thumb__
+#include <sys/linux-syscalls.h>
+
+
+%(fname)s:
+"""
+
+thumb_call_default = thumb_header + """\
+    .save   {r7,lr}
+    push    {r7,lr}
+    ldr     r7, =%(idname)s
+    swi     #0
+    tst     r0, r0
+    bmi     1f
+    pop     {r7,pc}
+1:
+    neg     r0, r0
+    ldr     r1, =__set_errno
+    blx     r1
+    pop     {r7,pc}
+    .fnend
+"""
+
+thumb_call_long = thumb_header + """\
+    .save  {r4,r5,r7,lr}
+    push   {r4,r5,r7,lr}
+    ldr    r4, [sp,#16]
+    ldr    r5, [sp,#20]
+    ldr    r7, =%(idname)s
+    swi    #0
+    tst    r0, r0
+    bmi    1f
+    pop    {r4,r5,r7,pc}
+1:
+    neg    r0, r0
+    ldr    r1, =__set_errno
+    blx    r1
+    pop    {r4,r5,r7,pc}
+    .fnend
+"""
+
+
+class State:
+    def __init__(self):
+        self.old_stubs = []
+        self.new_stubs = []
+        self.other_files = []
+        self.syscalls = []
+
+    def x86_genstub(self,fname, numparams, idname):
+        t = { "fname"  : fname,
+              "idname" : idname }
+
+        result     = x86_header % t
+        stack_bias = 4
+        for r in range(numparams):
+            result     += "    pushl   " + x86_registers[r] + "\n"
+            stack_bias += 4
+
+        for r in range(numparams):
+            result += "    mov     %d(%%esp), %s" % (stack_bias+r*4, x86_registers[r]) + "\n"
+
+        result += x86_call % t
+
+        for r in range(numparams):
+            result += "    popl    " + x86_registers[numparams-r-1] + "\n"
+
+        result += x86_return
+        return result
+
+
+    def arm_genstub(self,fname, flags, idname):
+        t = { "fname"  : fname,
+              "idname" : idname }
+        if flags:
+            numargs = int(flags)
+            if numargs > 4:
+                return arm_call_long % t
+        return arm_call_default % t
+
+
+    def arm_eabi_genstub(self,fname, flags, idname):
+        t = { "fname"  : fname,
+              "idname" : idname }
+        if flags:
+            numargs = int(flags)
+            if numargs > 4:
+                return arm_eabi_call_long % t
+        return arm_eabi_call_default % t
+
+
+    def thumb_genstub(self,fname, flags, idname):
+        t = { "fname"  : fname,
+              "idname" : idname }
+        if flags:
+            numargs = int(flags)
+            if numargs > 4:
+                return thumb_call_long % t
+        return thumb_call_default % t
+
+
+    def process_file(self,input):
+        parser = SysCallsTxtParser()
+        parser.parse_file(input)
+        self.syscalls = parser.syscalls
+        parser = None
+
+        for t in self.syscalls:
+            syscall_func   = t["func"]
+            syscall_params = t["params"]
+            syscall_name   = t["name"]
+
+            if t["id"] >= 0:
+                if gen_thumb_stubs:
+                    t["asm-thumb"] = self.thumb_genstub(syscall_func,len(syscall_params),"__NR_"+syscall_name)
+                else:
+                    if gen_eabi_stubs:
+                        t["asm-arm"]   = self.arm_eabi_genstub(syscall_func,len(syscall_params),"__NR_"+syscall_name)
+                    else:
+                        t["asm-arm"]   = self.arm_genstub(syscall_func,len(syscall_params),"__NR_"+syscall_name)
+
+            if t["id2"] >= 0:
+                t["asm-x86"] = self.x86_genstub(syscall_func,len(syscall_params),"__NR_"+syscall_name)
+
+    def gen_NR_syscall(self,fp,name,id):
+        fp.write( "#define __NR_%-25s    (__NR_SYSCALL_BASE + %d)\n" % (name,id) )
+
+    # now dump the content of linux/_syscalls.h
+    def gen_linux_syscalls_h(self):
+        path = "include/sys/linux-syscalls.h"
+        D( "generating "+path )
+        fp = create_file( path )
+        fp.write( "/* auto-generated by gensyscalls.py, do not touch */\n" )
+        fp.write( "#ifndef _BIONIC_LINUX_SYSCALLS_H_\n\n" )
+        fp.write( "#if !defined __ASM_ARM_UNISTD_H && !defined __ASM_I386_UNISTD_H\n" )
+        fp.write( "#if defined __arm__ && !defined __ARM_EABI__ && !defined __thumb__\n" )
+        fp.write( "  #  define __NR_SYSCALL_BASE  0x900000\n" )
+        fp.write( "  #else\n" )
+        fp.write( "  #  define  __NR_SYSCALL_BASE  0\n" )
+        fp.write( "  #endif\n\n" )
+
+        # first, all common syscalls
+        for sc in self.syscalls:
+            sc_id  = sc["id"]
+            sc_id2 = sc["id2"]
+            sc_name = sc["name"]
+            if sc_id == sc_id2 and sc_id >= 0:
+                self.gen_NR_syscall( fp, sc_name, sc_id )
+
+        # now, all arm-specific syscalls
+        fp.write( "\n#ifdef __arm__\n" );
+        for sc in self.syscalls:
+            sc_id  = sc["id"]
+            sc_id2 = sc["id2"]
+            sc_name = sc["name"]
+            if sc_id != sc_id2 and sc_id >= 0:
+                self.gen_NR_syscall( fp, sc_name, sc_id )
+        fp.write( "#endif\n" );
+
+        # finally, all i386-specific syscalls
+        fp.write( "\n#ifdef __i386__\n" );
+        for sc in self.syscalls:
+            sc_id  = sc["id"]
+            sc_id2 = sc["id2"]
+            sc_name = sc["name"]
+            if sc_id != sc_id2 and sc_id2 >= 0:
+                self.gen_NR_syscall( fp, sc_name, sc_id2 )
+        fp.write( "#endif\n" );
+
+        fp.write( "\n#endif\n" )
+        fp.write( "\n#endif /* _BIONIC_LINUX_SYSCALLS_H_ */\n" );
+        fp.close()
+        self.other_files.append( path )
+
+
+    # now dump the content of linux/_syscalls.h
+    def gen_linux_unistd_h(self):
+        path = "include/sys/linux-unistd.h"
+        D( "generating "+path )
+        fp = create_file( path )
+        fp.write( "/* auto-generated by gensyscalls.py, do not touch */\n" )
+        fp.write( "#ifndef _BIONIC_LINUX_UNISTD_H_\n\n" );
+        fp.write( "#ifdef __cplusplus\nextern \"C\" {\n#endif\n\n" )
+
+        for sc in self.syscalls:
+            fp.write( sc["decl"]+"\n" )
+
+        fp.write( "#ifdef __cplusplus\n}\n#endif\n" )
+        fp.write( "\n#endif /* _BIONIC_LINUX_UNISTD_H_ */\n" );
+        fp.close()
+        self.other_files.append( path )
+
+    # now dump the contents of syscalls.mk
+    def gen_arch_arm_syscalls_mk(self):
+        path = "arch-arm/syscalls.mk"
+        D( "generating "+path )
+        fp = create_file( path )
+        fp.write( "# auto-generated by gensyscalls.py, do not touch\n" )
+        fp.write( "syscall_src := \n" )
+        for sc in self.syscalls:
+                if sc["id"] >= 0:
+                        fp.write( "syscall_src += arch-arm/syscalls/%s.S\n" % sc["func"] )
+        fp.close()
+        self.other_files.append( path )
+
+    # now generate each syscall stub
+    def gen_syscall_stubs(self):
+        for sc in self.syscalls:
+            if sc.has_key("asm-arm"):
+                fname = "arch-arm/syscalls/%s.S" % sc["func"]
+                D( ">>> generating "+fname )
+                fp = create_file( fname )
+                fp.write(sc["asm-arm"])
+                fp.close()
+                self.new_stubs.append( fname )
+
+            if sc.has_key("asm-thumb"):
+                fname = "arch-arm/syscalls/%s.S" % sc["func"]
+                D( ">>> generating "+fname )
+                fp = create_file( fname )
+                fp.write(sc["asm-thumb"])
+                fp.close()
+                self.new_stubs.append( fname )
+
+            if sc.has_key("asm-x86"):
+                fname = "arch-x86/syscalls/%s.S" % sc["func"]
+                D( ">>> generating "+fname )
+                fp = create_file( fname )
+                fp.write(sc["asm-x86"])
+                fp.close()
+                self.new_stubs.append( fname )
+
+
+    def  regenerate(self):
+        D( "scanning for existing architecture-specific stub files" )
+
+        bionic_root_len = len(bionic_root)
+
+        for arch in all_archs:
+            arch_path = bionic_root + "arch-" + arch
+            D( "scanning " + arch_path )
+            files = glob.glob( arch_path + "/syscalls/*.S" )
+            for f in files:
+                self.old_stubs.append( f[bionic_root_len:] )
+
+        D( "found %d stub files" % len(self.old_stubs) )
+
+        if not os.path.exists( bionic_temp ):
+            D( "creating %s" % bionic_temp )
+            os.mkdir( bionic_temp )
+
+#        D( "p4 editing source files" )
+#        for arch in all_archs:
+#            commands.getoutput( "p4 edit " + arch + "/syscalls/*.S " )
+#            commands.getoutput( "p4 edit " + arch + "/syscalls.mk" )
+#        commands.getoutput( "p4 edit " + bionic_root + "include/sys/linux-syscalls.h" )
+
+        D( "re-generating stubs and support files" )
+
+        self.gen_linux_syscalls_h()
+        self.gen_arch_arm_syscalls_mk()
+        self.gen_linux_unistd_h()
+        self.gen_syscall_stubs()
+
+        D( "comparing files" )
+        adds    = []
+        edits   = []
+
+        for stub in self.new_stubs + self.other_files:
+            if not os.path.exists( bionic_root + stub ):
+                # new file, P4 add it
+                D( "new file:     " + stub)
+                adds.append( bionic_root + stub )
+                shutil.copyfile( bionic_temp + stub, bionic_root + stub )
+
+            elif not filecmp.cmp( bionic_temp + stub, bionic_root + stub ):
+                D( "changed file: " + stub)
+                edits.append( stub )
+
+        deletes = []
+        for stub in self.old_stubs:
+            if not stub in self.new_stubs:
+                D( "deleted file: " + stub)
+                deletes.append( bionic_root + stub )
+
+
+        if adds:
+            commands.getoutput( "p4 add " + string.join( adds, " " ) )
+        if deletes:
+            commands.getoutput( "p4 delete " + string.join( deletes, " " ) )
+        if edits:
+            commands.getoutput( "p4 edit " + string.join( edits, " " ) )
+            for file in edits:
+                shutil.copyfile( bionic_temp + file, bionic_root + file )
+
+        D("ready to go !!")
+
+D_setlevel(1)
+
+state = State()
+state.process_file(bionic_root+"SYSCALLS.TXT")
+state.regenerate()