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- Hi, Folks,
-
- This is the second Linux/ELF core dump patch for gdb 4.14, which is
- based on the patch made by jeremy@sour.sw.oz.au (Jeremy Fitzhardinge)
- and Eric Youngdale's shared library support. You need kernel 1.3.5 or
- above to generate ELF core dump.
-
- The primary ftp sites for the compiler/C library are tsx-11.mit.edu
- under pub/linux/packages/GCC and sunsite.unc.edu under pub/Linux/GCC.
- gdb-4.14.elf.1.bin.tar.gz contains gdb-4.1.14.elf.1.diff.gz, a patch
- against gdb 4.14, and gdb, a static ELF gdb binary. You need libc
- 5.1.2 or above to compile it without fixing one Linux header file,
- <sys/procfs.h> which should include <linux/elfcore.h>.
-
-
- H.J.
- hjl@nynexst.com
- 07/08/95
- ----From Eric-----
-
- This directory contains a gdb that will work with ELF images
- and automatically detect the shared libraries that are in use. You
- will now be able to debug into a shared library in a transparent
- fashion without any of the hacks that we have used in the past.
-
- gdb.diff: patches to gdb-4.14
- gdb - ELF executable for gdb linked against libc.so.5.
-
-
- Here is an example of the new capabilities:
- ---------------------------------------------------------------
- bash$ gdb test
- GDB is free software and you are welcome to distribute copies of it
- under certain conditions; type "show copying" to see the conditions.
- There is absolutely no warranty for GDB; type "show warranty" for details.
- GDB 4.14 (i486-linux), Copyright 1995 Free Software Foundation, Inc...
- (no debugging symbols found)...
- (gdb) break main
- Breakpoint 1 at 0x8000513
- (gdb) break printf
- Breakpoint 2 at 0x80003e8 # Note - this is in PLT of test.
- (gdb) info shared
- No shared libraries loaded at this time.
- (gdb) run
- Starting program: /usr1/users/eric/test
- (no debugging symbols found)...Breakpoint 2 at 0x50030940 #Bkpt now in shlib
- (no debugging symbols found)...
- Breakpoint 1, 0x8000513 in main ()
- (gdb) info shared
- From To Syms Read Shared Object Library
- 0x50007000 0x500ab2cc Yes /lib/libc.so.5
- 0x50000000 0x50005374 Yes /lib/ld-linux.so.1
- (gdb) info break
- Num Type Disp Enb Address What
- 1 breakpoint keep y 0x08000513 <main+3>
- breakpoint already hit 1 time
- 2 breakpoint keep y 0x50030940 <printf>
- (gdb) disass printf
- Dump of assembler code for function printf:
- 0x50030940 <printf>: pushl %ebx
- 0x50030941 <printf+1>: call 0x50030946 <printf+6>
- 0x50030946 <printf+6>: popl %ebx
- 0x50030947 <printf+7>: addl $0x4b116,%ebx
- 0x5003094d <printf+13>: movl 0x8(%esp,1),%eax
- 0x50030951 <printf+17>: leal 0xc(%esp,1),%edx
- 0x50030955 <printf+21>: pushl %edx
- 0x50030956 <printf+22>: pushl %eax
- 0x50030957 <printf+23>: movl 0x82c(%ebx),%eax
- 0x5003095d <printf+29>: pushl %eax
- 0x5003095e <printf+30>: call 0x500144d8 <_init+6584>
- 0x50030963 <printf+35>: addl $0xc,%esp
- 0x50030966 <printf+38>: popl %ebx
- 0x50030967 <printf+39>: ret
- 0x50030968 <printf+40>: nop
- 0x50030969 <printf+41>: nop
- 0x5003096a <printf+42>: nop
- 0x5003096b <printf+43>: nop
- 0x5003096c <printf+44>: nop
- 0x5003096d <printf+45>: nop
- 0x5003096e <printf+46>: nop
- 0x5003096f <printf+47>: nop
- End of assembler dump.
-
-