add README and missing file

README

@@ -0,0 +1,6 @@
+git clone git@github.com:comex/datautils0.git
+cd datautils0
+git clone git@github.com:comex/data.git
+make NATIVE=1
+./make_kernel_patchfile /path/to/kernelcache /tmp/patchfile
+./apply_patchfile /path/to/kernelcache /tmp/patchfile /output/patched/kernelcache

sandbox.S

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+.thumb
+.syntax unified
+start:
+// <- 
+    push {r0-r4, lr}
+    sub sp, #0x44
+    ldr r2, dvp_struct_offset
+    ldr r4, [r3, r2]
+    cmp r4, #0
+    beq actually_eval
+    ldr r3, vn_getpath
+    mov r1, sp
+    movs r0, #0x40
+    add r2, sp, #0x40
+    str r0, [r2]
+    mov r0, r4
+    blx r3
+    cmp r0, #28
+    beq enospc
+    cmp r0, #0
+    bne actually_eval
+enospc:
+    # that error's okay...
+
+    mov r0, sp
+    adr r1, var_mobile
+    movs r2, #19 ;# len(var_mobile)
+    ldr r3, memcmp
+    blx r3
+    cmp r0, #0
+    bne allow
+
+    mov r0, sp
+    adr r1, preferences_com_apple
+    movs r2, #49 ;# len(preferences_com_apple)
+    ldr r3, memcmp
+    blx r3
+    cmp r0, #0
+    beq actually_eval
+
+    mov r0, sp
+    adr r1, preferences
+    movs r2, #39 ;# len(preferences)
+    ldr r3, memcmp
+    blx r3
+    cmp r0, #0
+    bne actually_eval
+
+allow:
+    # it's not in /var/mobile but we have a path, let it through
+    add sp, #0x44
+    pop {r0}
+    movs r1, #0
+    str r1, [r0]
+    movs r1, #0x18
+    strb r1, [r0, #4]
+    pop {r1-r4, pc}
+
+actually_eval:
+    add sp, #0x44
+    ldr r0, [sp, #5*4]
+    mov lr, r0
+    ldr r1, orig_addr
+    mov r9, r1
+    ldr r0, is_armv7
+    cmp r0, #0
+    pop {r0-r4}
+    add sp, #4
+    beq armlol
+    .long c_sb_evaluate_orig1
+    .long c_sb_evaluate_orig2
+    bx r9
+armlol:
+    bx pc
+.arm
+    .align 2
+    .long c_sb_evaluate_orig1
+    .long c_sb_evaluate_orig2
+    bx r9
+    
+
+.align 2
+var_mobile: .ascii "/private/var/mobile"
+.align 2
+preferences_com_apple: .ascii "/private/var/mobile/Library/Preferences/com.apple"
+.align 2
+preferences: .ascii "/private/var/mobile/Library/Preferences"
+.align 2
+orig_addr: .long c_sb_evaluate_jumpto
+memcmp: .long c_memcmp
+vn_getpath: .long c_vn_getpath
+dvp_struct_offset: .long c_dvp_struct_offset
+is_armv7: .long c_is_armv7