arm-elf-gdb can't load big-endian thumb programs

[Richard Earnshaw <rearnsha at arm dot com>]

With the latest gdb sources, programs built with current gcc tools and 
-mthumb -mbig-endian will no longer load into either gdb or the ARM 
simulator.  This used to work... and still does if the same executable is 
loaded into an old version of the simulator; so I don't think it is gas/ld 
that's at fault.

I don't know about other combinations, I've not had a chance to try them.


sun18:testsuite [1320] $ ../../../../gdb-elf/sim/arm/run 941014-1.x0
../../../../gdb-elf/sim/arm/run: no loadable sections "941014-1.x0"
sun18:testsuite [1321] $ ../../../../gdb-elf/gdb/gdb 941014-1.x0
GNU gdb 5.0
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GDB is free software, covered by the GNU General Public License, and you 
are
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This GDB was configured as "--host=sparc-sun-solaris2.5.1 
--target=arm-elf"...
(gdb) target sim
Connected to the simulator.
(gdb) load
gdbsim: no loadable sections "/home/rearnsha/gnu/egcs/arm-elf/gcc/testsuite
/941014-1.x0"
unable to load program

(gdb) quit
sun18:testsuite [1322] $ ../../binutils/objdump -h 941014-1.x0 

941014-1.x0:     file format elf32-bigarm

Sections:
Idx Name          Size      VMA       LMA       File off  Algn
  0 .text         000023c0  00008000  00008000  00008000  2**2
                  CONTENTS, ALLOC, LOAD, READONLY, CODE
  1 .rodata       00000059  0000a3c0  0000a3c0  0000a3c0  2**2
                  CONTENTS, ALLOC, LOAD, READONLY, DATA
  2 .data         00000854  0000a51c  0000a51c  0000a51c  2**2
                  CONTENTS, ALLOC, LOAD, DATA
  3 .eh_frame     00000004  0000ad70  0000ad70  0000ad70  2**2
                  CONTENTS, ALLOC, LOAD, DATA
  4 .ctors        00000008  0000ad74  0000ad74  0000ad74  2**2
                  CONTENTS, ALLOC, LOAD, DATA
  5 .dtors        00000008  0000ad7c  0000ad7c  0000ad7c  2**2
                  CONTENTS, ALLOC, LOAD, DATA
  6 .sbss         00000000  0000ad84  0000ad84  0000ad84  2**0
                  CONTENTS
  7 .bss          000000dc  0000ad84  0000ad84  0000ad84  2**2
                  ALLOC
  8 .debug_aranges 00000340  00000000  00000000  0000ad84  2**0
                  CONTENTS, READONLY, DEBUGGING
  9 .debug_pubnames 00000657  00000000  00000000  0000b0c4  2**0
                  CONTENTS, READONLY, DEBUGGING
 10 .debug_info   00011947  00000000  00000000  0000b71b  2**0
                  CONTENTS, READONLY, DEBUGGING
 11 .debug_abbrev 00001d33  00000000  00000000  0001d062  2**0
                  CONTENTS, READONLY, DEBUGGING
 12 .debug_line   00004b26  00000000  00000000  0001ed95  2**0
                  CONTENTS, READONLY, DEBUGGING
 13 .stack        00000000  00080000  00080000  000238bb  2**0
                  CONTENTS