Re: [FWD] compiling emacs-bidi,

Thanks. Here is what I found:

The program dumps core on line 925 of unexelf.c (in
function unexec):

memcpy (NEW_SECTION_H (nn).sh_offset + new_base,
                  (caddr_t) OLD_SECTION_H (n).sh_addr,
                  new_data2_size);

The definitions in the beginning of unexelf.c are:

#define OLD_SECTION_H(n) \
     (*(ElfW(Shdr) *) ((byte *) old_section_h +
old_file_h->e_shentsize * (n)))

#define NEW_SECTION_H(n) \
     (*(ElfW(Shdr) *) ((byte *) new_section_h +
new_file_h->e_shentsize * (n)))


When I am in gdb at the unexec level, I get:
(gdb) print n
$14 = 20
(gdb) print nn
$15 = 20
(gdb) print new_section_h
$16 = (Elf32_Shdr *) 0xbee98a18
(gdb) print new_file_h
No symbol "new_file_h" in current context.
(gdb) print new_base
$17 = 0xbd6d5000 "\177ELF\001\001\001"
(gdb) print old_section_h
$18 = (Elf32_Shdr *) 0xbf34edb8
(gdb) print old_file_h
No symbol "old_file_h" in current context.
(gdb) print new_data2_size
$20 = 20204640

Any ideas? Thanks.

Rafi
--- Eli Zaretskii <[email protected]> wrote:
> > Date: Fri, 12 Mar 2004 23:12:46 -0800 (PST)
> > From: rs6233 <[email protected]>
> > 
> > Dumping under names emacs and emacs-21.3.50.1
> >  
> > Program received signal SIGSEGV, Segmentation
> fault.
> > 0x00c21dcc in memcpy () from /lib/tls/libc.so.6
> > 
> > 
> > 
> > 
> > When I did a backtrace, I got:
> > 
> > 
> > 
> > #0  0x00c21dcc in memcpy () from
> /lib/tls/libc.so.6
> > #1  0x081547d2 in unexec (
> >     new_name=0x97877e0
> > "/extras/emacs-bidi/emacs-bidi/src/emacs",
> >     old_name=0x978780c
> > "/extras/emacs-bidi/emacs-bidi/src/temacs",
> >     data_start=135852012, bss_start=0,
> entry_address=0) at unexelf.c:925
> 
> This is where you should start debugging: in frame
> #1 unexelf.c called
> memcpy with bad arguments.  So the first thing to do
> is to find which
> argument is bad, and then try to figure out why.
> 
> Therefore, please look at line 925 of unexelf.c and
> print the values
> of the arguments it passes to memcpy.  One or more
> of them should be
> wrong (e.g., NULL pointers etc.).


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