Address of variable doesn't work (ARM-ELF 4.18)?

[Grant Edwards <grante at visi dot com>]

Using arm-elf-gdb 4.18, how do I get gdb to print the address
of a variable or to use the address of a variable as the
argument for an 'x' command?

For example, my program is:

     1	#define Bufsize 100
     2	
     3	char buf[Bufsize];
     4	
     5	int main(void)
     6	{
     7	  int i;
     8	  
     9	  for (i=0; i<Bufsize; ++i)
    10	    buf[i] = i;
    11	  
    12	  while (1)
    13	    ;
    14	  
    15	  return 0;
    16	}

I run the program and stop it after a bit:

  (gdb) cont
  Continuing.
  RDI_execute: you pressed Escape

Actually, I pressed ctrl-C, but we'll ignore that. ;)

  Program received signal SIGINT, Interrupt.
  0x10007c in main () at main.c:12
  12        while (1)

I can print out the values in buf:

  (gdb) print/x buf
  $3 = {0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8, 0x9, 0xa,0xb, 0xc, 0xd, 0xe, 0xf, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15,0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29,0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, 0x30, 0x31, 0x32, 0x33,0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d,0x3e, 0x3f, 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47,0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, 0x50, 0x51,0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a, 0x5b,0x5c, 0x5d, 0x5e, 0x5f, 0x60, 0x61, 0x62, 0x63}

I know by looking at the link map that buf is at address
0x100090, and gdb knows it too::

  (gdb) x/8xb 0x100090
  0x100090 <buf>: 0x00    0x01    0x02    0x03    0x04    0x05    0x06    0x07
           ^^^^^
           See, gdb knows where 'buf' is!

But the address-of operator just won't work:

  (gdb) print &buf
  $4 = (char (*)[100]) 0x0

  (gdb) x/8xb &buf
  0x0:    0xff    0xff    0xff    0xff    0xff    0xff    0xff    0xff

Using a pointer expression as an agurment to the 'x' command
doesn't work either:

  (gdb) x/8xb buf+0
  0x0:    0xff    0xff    0xff    0xff    0xff    0xff    0xff    0xff

The same example under w gdb 4.18 Linux-i386 works fine.  This
obviously isn't a show-stopping problem, but it's annoying.

Here's the arm-elf-gdb version info (the one where '&' doesn't work)

GNU gdb 4.18
[...]
This GDB was configured as "--host=i586-pc-linux-gnu --target=arm-elf".
JEENI (ADP, ARM7TDI) Rev 1.1
Rebuilt on Apr 13 1998 at 13:23:52
SN=9805J050 ENET=00:80:CF:00:03:31 IP=204.73.219.108
Connected to ARM RDI target.


-- 
Grant Edwards
grante@visi.com