6.25) I get '"/usr/platform/SUNW,Ultra-1/lib/libc_psr.so.1": not in executable format: format not recognized' from gdb on my Ultra.

gdb needs to be updated to understand the "V8+" executable format.

Either install gdb 4.16 or later, or update the gdb 4.15.1 distribution with the following patch to bfd/elf32-sparc.c and include/elf/common.h:

	  *** gdb-4.15.1/bfd/elf32-sparc.c       Fri Nov  3 12:30:15 1995
	  --- elf32-sparc.c        Thu Nov 23 14:44:37 1995
	  ***************
	  *** 1486,1491 ****
	  --- 1486,1492 ----
	    #define TARGET_BIG_NAME       "elf32-sparc"
	    #define ELF_ARCH      bfd_arch_sparc
	    #define ELF_MACHINE_CODE EM_SPARC
	  + #define       ELF_MACHINE_ALT1 EM_SPARC32PLUS
	    #define ELF_MAXPAGESIZE 0x10000
	    #define elf_backend_create_dynamic_sections \
	                                          _bfd_elf_create_dynamic_sections


	  *** gdb-4.15.1/include/elf/common.h     Fri Nov  3 20:20:25 1995
	  --- common.h    Thu Nov 23 14:20:07 1995
	  ***************
	  *** 83,88 ****
	  --- 83,91 ----
	    #define EM_SPARC64     11     /* SPARC v9 (not official) 64-bit */

	    #define EM_PARISC      15     /* HPPA */
	  +
	  + #define       EM_SPARC32PLUS  18      /* Sun SPARC 32+ */
	  +
	    #define EM_PPC               20       /* PowerPC */

 	   /* If it is necessary to assign new unofficial EM_* values, please pick large

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