Re: [ECOS] __attribute aligned and objcopy

[Gary Thomas <gary@mlbassoc.com>]

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On Thu, 2003-09-25 at 04:37, Øyvind Harboe wrote:
> This is driving me nuts, and I can't seem to find a solution
> to this on the net.
> 
> I have a romfs image that I try to convert to a .o file using:
> 
> 
> # how do I add a __attribute((aligned(4))__ to objcopy?
> 
> arm-elf-objcopy -B arm -I binary -O elf32-littlearm --rename-section
> .data=.rodata1 $*.rawdata $(OUTPUT)/$*_raw.o
> 
> This is used to mount a ROMFS:
> 
> extern "C"
> {
> extern const cyg_uint8  _binary___rom_rawdata_start[];
> }
> 
> // this is not aligned to 4 bytes, and hence it does not work
> sprintf( address, "%p", _binary___rom_rawdata_start);
> err = mount( address, "rom", "romfs" );
> 	

What I've done in the past is use GCC to get the magic right.  Try 
looking at packages/hal/arm/edb7xxx/current/misc/long*.h
These are binary data files which I then pass through GCC.

I generated them using 'hexdump'.  You can write a script to produce
most any output you'd like.  I've attached the few that I use.  To
use the script:
  % hexdump -f hex_init FILE
  0x23, 0x3d, 0x3d, 0x3d, 0x3d, 0x3d, 0x3d, 0x3d, // 0x000008
  0x3d, 0x3d, 0x3d, 0x3d, 0x3d, 0x3d, 0x3d, 0x3d, // 0x000010
  0x3d, 0x3d, 0x3d, 0x3d, 0x3d, 0x3d, 0x3d, 0x3d, // 0x000018
  0x3d, 0x3d, 0x3d, 0x3d, 0x3d, 0x3d, 0x3d, 0x3d, // 0x000020
  0x3d, 0x3d, 0x3d, 0x3d, 0x3d, 0x3d, 0x3d, 0x3d, // 0x000028
  0x3d, 0x3d, 0x3d, 0x3d, 0x3d, 0x3d, 0x3d, 0x3d, // 0x000030
Be sure and use the "-v" option, or else it can end up like this:
  0x23, 0x3d, 0x3d, 0x3d, 0x3d, 0x3d, 0x3d, 0x3d, // 0x000008
  0x3d, 0x3d, 0x3d, 0x3d, 0x3d, 0x3d, 0x3d, 0x3d, // 0x000010
  *
  0x3d, 0x3d, 0x3d, 0x3d, 0x3d, 0x3d, 0x0a, 0x23, // 0x000050
  0x0a, 0x23, 0x20, 0x20, 0x20, 0x20, 0x65, 0x63, // 0x000058

-- 
Gary Thomas <gary@mlbassoc.com>
MLB Associates

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"0x%06.6_ax "  16/1 "%02x "
"  |" "%_p"
"|\n"

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"/* 0x%06.6_ax */ "  16/1 "0x%02x,"
"\n"

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8/1 "0x%02x, " " // 0x%06.6_ax\n"


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