--- wikisrc/users/leot/aarch64_problems.mdwn	2018/06/28 09:10:49	1.4
+++ wikisrc/users/leot/aarch64_problems.mdwn	2018/07/23 21:25:42	1.5
@@ -22,33 +22,102 @@ Doing a (please note that also `python36
     Illegal instruction (core dumped)
     Exit 132
 
-leads to a SIGILL. Trying to reduce the test case this also happens with just a:
+...where:
 
-    $ python2.7 -c 'import OpenSSL'
-    Illegal instruction (core dumped)
-    Exit 132
-
-Trying to debug this a bit further we can see:
-
-    % cat asi.py
-    import OpenSSL
-    % python2.7 -m trace --trace asi.py
-    [...]
-    binding.py(88):     for attr in dir(lib):
-    binding.py(89):         if attr not in excluded_names:
-    binding.py(90):             setattr(conditional_lib, attr, getattr(lib, attr))
-    binding.py(88):     for attr in dir(lib):
-    binding.py(89):         if attr not in excluded_names:
-    binding.py(90):             setattr(conditional_lib, attr, getattr(lib, attr))
-    binding.py(88):     for attr in dir(lib):
-    binding.py(89):         if attr not in excluded_names:
-    binding.py(90):             setattr(conditional_lib, attr, getattr(lib, attr))
-    binding.py(88):     for attr in dir(lib):
-    binding.py(92):     return conditional_lib
-    binding.py(126):                 cls._lib_loaded = True
-    binding.py(128):                 cls.lib.SSL_library_init()
-    Illegal instruction (core dumped)
-    Exit 132
-
-Please also note that this problem seems limited to `OpenSSL`, `ssl` module
-works.
+    % gdb -core python2.7.core `which python2.7`
+    Reading symbols from /usr/pkg/bin/python2.7...(no debugging symbols found)...done.
+    [New process 1]
+    Core was generated by `python2.7'.
+    Program terminated with signal SIGILL, Illegal instruction.
+    #0  0x0000f42f5fd00000 in ?? ()
+    (gdb) bt 5
+    #0  0x0000f42f5fd00000 in ?? ()
+    #1  0x0000f42f5fd0a3d0 in restore_errno_only () at c/misc_thread_common.h:43
+    #2  0x0000f42f5fbf0f90 in _cffi_f_SSL_library_init (self=<optimized out>, noarg=<optimized out>)
+        at build/temp.netbsd-8.99.22-evbarm-2.7/_openssl.c:51839
+    #3  0x0000f42f617606ac in PyEval_EvalFrameEx () from /usr/pkg/lib/libpython2.7.so.1.0
+    #4  0x0000f42f6175e5c0 in PyEval_EvalCodeEx () from /usr/pkg/lib/libpython2.7.so.1.0
+    (More stack frames follow...)
+    (gdb) f 2
+    #2  0x0000f42f5fbf0f90 in _cffi_f_SSL_library_init (self=<optimized out>, noarg=<optimized out>)
+        at build/temp.netbsd-8.99.22-evbarm-2.7/_openssl.c:51839
+    warning: Source file is more recent than executable.
+    51839     _cffi_restore_errno();
+    (gdb) list
+    51834   _cffi_f_SSL_library_init(PyObject *self, PyObject *noarg)
+    51835   {
+    51836     int result;
+    51837
+    51838     Py_BEGIN_ALLOW_THREADS
+    51839     _cffi_restore_errno();
+    51840     { result = SSL_library_init(); }
+    51841     _cffi_save_errno();
+    51842     Py_END_ALLOW_THREADS
+    51843
+    (gdb) f 1
+    #1  0x0000f42f5fd0a3d0 in restore_errno_only () at c/misc_thread_common.h:43
+    43      static void restore_errno_only(void) { errno = cffi_saved_errno; }
+    (gdb) list
+    38         syntactically valid to use "__thread" with this C compiler. */
+    39      #ifdef USE__THREAD
+    40
+    41      static __thread int cffi_saved_errno = 0;
+    42      static void save_errno_only(void) { cffi_saved_errno = errno; }
+    43      static void restore_errno_only(void) { errno = cffi_saved_errno; }
+    44
+    45      #else
+    46
+    47      static void save_errno_only(void)
+    (gdb) disas
+    Dump of assembler code for function restore_errno_only:
+       0x0000f42f5fd0a3b0 <+0>:     str     x30, [sp, #-16]!
+       0x0000f42f5fd0a3b4 <+4>:     bl      0xf42f5fd075c0 <__errno@plt>
+       0x0000f42f5fd0a3b8 <+8>:     mov     x2, x0
+       0x0000f42f5fd0a3bc <+12>:    mrs     x1, tpidr_el0
+       0x0000f42f5fd0a3c0 <+16>:    adrp    x0, 0xf42f5fd34000
+       0x0000f42f5fd0a3c4 <+20>:    ldr     x3, [x0, #4088]
+       0x0000f42f5fd0a3c8 <+24>:    add     x0, x0, #0xff8
+       0x0000f42f5fd0a3cc <+28>:    blr     x3
+    => 0x0000f42f5fd0a3d0 <+32>:    ldr     w0, [x1, x0]
+       0x0000f42f5fd0a3d4 <+36>:    str     w0, [x2]
+       0x0000f42f5fd0a3d8 <+40>:    ldr     x30, [sp], #16
+       0x0000f42f5fd0a3dc <+44>:    ret
+    End of assembler dump.
+    (gdb) info reg
+    x0             0xf42f5fd34ff8   268484308324344
+    x1             0xf42f61875080   268484336898176
+    x2             0xf42f6186c848   268484336863304
+    x3             0xf42f5fd00000   268484308107264
+    x4             0xf42f5ff3c0b8   268484310450360
+    x5             0xf42f60000570   268484311254384
+    x6             0x65000000000000 28428972647776256
+    x7             0x65     101
+    x8             0xf42f6185e000   268484336803840
+    x9             0xf42f6185e668   268484336805480
+    x10            0xf42f6185e668   268484336805480
+    x11            0x1      1
+    x12            0x30     48
+    x13            0xffffff9264f0   281474969527536
+    x14            0x65     101
+    x15            0x3      3
+    x16            0xf42f615bd730   268484334049072
+    x17            0xf42f615ec2c8   268484334240456
+    x18            0xf42f615ca1a0   268484334100896
+    x19            0xf42f5fc9cea8   268484307701416
+    x20            0xf42f5fd9c3c0   268484308747200
+    x21            0xf42f61307090   268484331204752
+    x22            0xf42f5fcd38e8   268484307925224
+    x23            0xf42f5fcd10a0   268484307914912
+    x24            0xf42f5fb8c5a8   268484306585000
+    x25            0xf42f5fd9c3c0   268484308747200
+    x26            0xf42f5fbf0f70   268484306997104
+    x27            0xf42f5fdd467e   268484308977278
+    x28            0xf42f61307090   268484331204752
+    x29            0x0      0
+    x30            0xf42f5fd0a3d0   268484308149200
+    sp             0xffffff926760   0xffffff926760
+    pc             0xf42f5fd0a3d0   0xf42f5fd0a3d0 <restore_errno_only+32>
+    cpsr           0x60000000       [ EL=0 C Z ]
+    fpsr           0x3000000        50331648
+    fpcr           0x10     16
+    (gdb) quit