File:  [NetBSD Developer Wiki] / wikisrc / users / leot / aarch64_problems.mdwn
Revision 1.7: download - view: text, annotated - select for diffs
Mon Jul 23 22:51:09 2018 UTC (3 years, 1 month ago) by leot
Branches: MAIN
CVS tags: HEAD
Add a kludge for the cffi problem... Now requests works!

(According <joerg> tls does not work yet on aarch64, and that explains the
problem)

    1: # Various (possible) problems of aarch64
    2: 
    3: Here a list of possible problems of NetBSD/evbarm aarch64 that needs further
    4: investigation in order to write proper PR or better yet to fix them!
    5: 
    6: 
    7: ## `mpv` and NetBSD crashes
    8: Just by invoking `mpv` via:
    9: 
   10:     $ mpv
   11: 
   12: It is possible to completely crash NetBSD on aarch64. Investigate why and if
   13: possible get a complete backtrace.
   14: 
   15: (Is it PaX MPROTECT related?)
   16: 
   17: 
   18: ## Python `import requests` SIGILLs
   19: Doing a (please note that also `python36` is affected):
   20: 
   21:     $ python2.7 -c 'import requests'
   22:     Illegal instruction (core dumped)
   23:     Exit 132
   24: 
   25: ...where:
   26: 
   27:     % gdb -core python2.7.core `which python2.7`
   28:     Reading symbols from /usr/pkg/bin/python2.7...(no debugging symbols found)...done.
   29:     [New process 1]
   30:     Core was generated by `python2.7'.
   31:     Program terminated with signal SIGILL, Illegal instruction.
   32:     #0  0x0000f42f5fd00000 in ?? ()
   33:     (gdb) bt 5
   34:     #0  0x0000f42f5fd00000 in ?? ()
   35:     #1  0x0000f42f5fd0a3d0 in restore_errno_only () at c/misc_thread_common.h:43
   36:     #2  0x0000f42f5fbf0f90 in _cffi_f_SSL_library_init (self=<optimized out>, noarg=<optimized out>)
   37:         at build/temp.netbsd-8.99.22-evbarm-2.7/_openssl.c:51839
   38:     #3  0x0000f42f617606ac in PyEval_EvalFrameEx () from /usr/pkg/lib/libpython2.7.so.1.0
   39:     #4  0x0000f42f6175e5c0 in PyEval_EvalCodeEx () from /usr/pkg/lib/libpython2.7.so.1.0
   40:     (More stack frames follow...)
   41:     (gdb) f 2
   42:     #2  0x0000f42f5fbf0f90 in _cffi_f_SSL_library_init (self=<optimized out>, noarg=<optimized out>)
   43:         at build/temp.netbsd-8.99.22-evbarm-2.7/_openssl.c:51839
   44:     warning: Source file is more recent than executable.
   45:     51839     _cffi_restore_errno();
   46:     (gdb) list
   47:     51834   _cffi_f_SSL_library_init(PyObject *self, PyObject *noarg)
   48:     51835   {
   49:     51836     int result;
   50:     51837
   51:     51838     Py_BEGIN_ALLOW_THREADS
   52:     51839     _cffi_restore_errno();
   53:     51840     { result = SSL_library_init(); }
   54:     51841     _cffi_save_errno();
   55:     51842     Py_END_ALLOW_THREADS
   56:     51843
   57:     (gdb) f 1
   58:     #1  0x0000f42f5fd0a3d0 in restore_errno_only () at c/misc_thread_common.h:43
   59:     43      static void restore_errno_only(void) { errno = cffi_saved_errno; }
   60:     (gdb) list
   61:     38         syntactically valid to use "__thread" with this C compiler. */
   62:     39      #ifdef USE__THREAD
   63:     40
   64:     41      static __thread int cffi_saved_errno = 0;
   65:     42      static void save_errno_only(void) { cffi_saved_errno = errno; }
   66:     43      static void restore_errno_only(void) { errno = cffi_saved_errno; }
   67:     44
   68:     45      #else
   69:     46
   70:     47      static void save_errno_only(void)
   71:     (gdb) disas
   72:     Dump of assembler code for function restore_errno_only:
   73:        0x0000f42f5fd0a3b0 <+0>:     str     x30, [sp, #-16]!
   74:        0x0000f42f5fd0a3b4 <+4>:     bl      0xf42f5fd075c0 <__errno@plt>
   75:        0x0000f42f5fd0a3b8 <+8>:     mov     x2, x0
   76:        0x0000f42f5fd0a3bc <+12>:    mrs     x1, tpidr_el0
   77:        0x0000f42f5fd0a3c0 <+16>:    adrp    x0, 0xf42f5fd34000
   78:        0x0000f42f5fd0a3c4 <+20>:    ldr     x3, [x0, #4088]
   79:        0x0000f42f5fd0a3c8 <+24>:    add     x0, x0, #0xff8
   80:        0x0000f42f5fd0a3cc <+28>:    blr     x3
   81:     => 0x0000f42f5fd0a3d0 <+32>:    ldr     w0, [x1, x0]
   82:        0x0000f42f5fd0a3d4 <+36>:    str     w0, [x2]
   83:        0x0000f42f5fd0a3d8 <+40>:    ldr     x30, [sp], #16
   84:        0x0000f42f5fd0a3dc <+44>:    ret
   85:     End of assembler dump.
   86:     (gdb) info reg
   87:     x0             0xf42f5fd34ff8   268484308324344
   88:     x1             0xf42f61875080   268484336898176
   89:     x2             0xf42f6186c848   268484336863304
   90:     x3             0xf42f5fd00000   268484308107264
   91:     x4             0xf42f5ff3c0b8   268484310450360
   92:     x5             0xf42f60000570   268484311254384
   93:     x6             0x65000000000000 28428972647776256
   94:     x7             0x65     101
   95:     x8             0xf42f6185e000   268484336803840
   96:     x9             0xf42f6185e668   268484336805480
   97:     x10            0xf42f6185e668   268484336805480
   98:     x11            0x1      1
   99:     x12            0x30     48
  100:     x13            0xffffff9264f0   281474969527536
  101:     x14            0x65     101
  102:     x15            0x3      3
  103:     x16            0xf42f615bd730   268484334049072
  104:     x17            0xf42f615ec2c8   268484334240456
  105:     x18            0xf42f615ca1a0   268484334100896
  106:     x19            0xf42f5fc9cea8   268484307701416
  107:     x20            0xf42f5fd9c3c0   268484308747200
  108:     x21            0xf42f61307090   268484331204752
  109:     x22            0xf42f5fcd38e8   268484307925224
  110:     x23            0xf42f5fcd10a0   268484307914912
  111:     x24            0xf42f5fb8c5a8   268484306585000
  112:     x25            0xf42f5fd9c3c0   268484308747200
  113:     x26            0xf42f5fbf0f70   268484306997104
  114:     x27            0xf42f5fdd467e   268484308977278
  115:     x28            0xf42f61307090   268484331204752
  116:     x29            0x0      0
  117:     x30            0xf42f5fd0a3d0   268484308149200
  118:     sp             0xffffff926760   0xffffff926760
  119:     pc             0xf42f5fd0a3d0   0xf42f5fd0a3d0 <restore_errno_only+32>
  120:     cpsr           0x60000000       [ EL=0 C Z ]
  121:     fpsr           0x3000000        50331648
  122:     fpcr           0x10     16
  123:     (gdb) quit
  124: 
  125: ...and `_cffi_restore_errno` and `_cffi_save_errno` are defined in
  126: `cffi/_cffi_include.h` as follows:
  127: 
  128:     #define _cffi_restore_errno                                              \
  129:         ((void(*)(void))_cffi_exports[13])
  130:     #define _cffi_save_errno                                                 \
  131:         ((void(*)(void))_cffi_exports[14])
  132: 
  133: The following patch workaround the issue:
  134: 
  135:     $NetBSD: aarch64_problems.mdwn,v 1.7 2018/07/23 22:51:09 leot Exp $
  136:     
  137:     Kludge for NetBSD/aarch64 SIGILL.
  138:     
  139:     --- setup.py.orig	2018-02-27 18:15:41.000000000 +0000
  140:     +++ setup.py
  141:     @@ -70,7 +70,7 @@ def ask_supports_thread():
  142:          ok = (sys.platform != 'win32' and
  143:                config.try_compile('__thread int some_threadlocal_variable_42;'))
  144:          if ok:
  145:     -        define_macros.append(('USE__THREAD', None))
  146:     +        pass
  147:          else:
  148:              ok1 = config.try_compile('int some_regular_variable_42;')
  149:              if not ok1:

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