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List: tru64-unix-managers
Subject: gdb and digital unix 3.2C .. the patch
From: Christophe Colle <colle () krtkg1 ! rug ! ac ! be>
Date: 1995-12-30 17:54:02
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Hi all,
Because I received already so many requests for the patch, I will post
them to this list ...
Have fun ...
Christophe
| \ =============================================================
| \ Colle Christophe Phone: +32-(0)9-2403955
+---- mail: colle@krtkg1.rug.ac.be http://krtkg1.rug.ac.be/~colle
|
----------+ When I'm not in Ghent, Then I'm probably Sailing
\________| ======= Radiotherapy Department, Ghent =============
---------- Forwarded message ----------
Date: Fri, 29 Dec 95 16:12:05 MET
From: Peter.Schauer <Peter.Schauer@regent.e-technik.tu-muenchen.de>
To: Christophe Colle <colle@krtkg1.rug.ac.be>
Subject: Re: gdb and digital unix 3.2C
OSF 3.2C strips all debugging symbols from startup files and shared libraries,
and gdb-4.15 is unable to deal with it.
Below is a bunch of patches that handle all known gdb-4.15/OSF-3.2C problems,
they will be part of the next GDB release.
*** gdb-4.15/gdb/alpha-tdep.c.orig Wed Aug 2 05:13:27 1995
--- gdb-4.15/gdb/alpha-tdep.c Fri Nov 17 18:20:30 1995
***************
*** 260,267 ****
alpha_extra_func_info_t proc_desc = frame->proc_desc;
/* We have to get the saved pc from the sigcontext
if it is a signal handler frame. */
! int pcreg = frame->signal_handler_caller ? PC_REGNUM
! : (proc_desc ? PROC_PC_REG(proc_desc) : RA_REGNUM);
if (proc_desc && PROC_DESC_IS_DUMMY(proc_desc))
return read_memory_integer(frame->frame - 8, 8);
--- 260,266 ----
alpha_extra_func_info_t proc_desc = frame->proc_desc;
/* We have to get the saved pc from the sigcontext
if it is a signal handler frame. */
! int pcreg = frame->signal_handler_caller ? PC_REGNUM : frame->pc_reg;
if (proc_desc && PROC_DESC_IS_DUMMY(proc_desc))
return read_memory_integer(frame->frame - 8, 8);
***************
*** 273,281 ****
alpha_saved_pc_after_call (frame)
struct frame_info *frame;
{
! alpha_extra_func_info_t proc_desc = find_proc_desc (frame->pc, frame->next);
! int pcreg = proc_desc ? PROC_PC_REG (proc_desc) : RA_REGNUM;
return read_register (pcreg);
}
--- 272,290 ----
alpha_saved_pc_after_call (frame)
struct frame_info *frame;
{
! CORE_ADDR pc = frame->pc;
! CORE_ADDR tmp;
! alpha_extra_func_info_t proc_desc;
! int pcreg;
!
! /* Skip over shared library trampoline if necessary. */
! tmp = SKIP_TRAMPOLINE_CODE (pc);
! if (tmp != 0)
! pc = tmp;
+ proc_desc = find_proc_desc (pc, frame->next);
+ pcreg = proc_desc ? PROC_PC_REG (proc_desc) : RA_REGNUM;
+
return read_register (pcreg);
}
***************
*** 350,355 ****
--- 359,365 ----
int frame_size;
int has_frame_reg = 0;
unsigned long reg_mask = 0;
+ int pcreg = -1;
if (start_pc == 0)
return NULL;
***************
*** 379,388 ****
--- 389,423 ----
int reg = (word & 0x03e00000) >> 21;
reg_mask |= 1 << reg;
temp_saved_regs.regs[reg] = sp + (short)word;
+ if (pcreg == -1)
+ pcreg = reg;
}
else if (word == 0x47de040f) /* bis sp,sp fp */
has_frame_reg = 1;
}
+ if (pcreg == -1)
+ {
+ while (cur_pc < (limit_pc + 12) && cur_pc < (start_pc + 12))
+ {
+ char buf[4];
+ unsigned long word;
+ int status;
+
+ status = read_memory_nobpt (cur_pc, buf, 4);
+ if (status)
+ memory_error (status, cur_pc);
+ cur_pc += 4;
+ word = extract_unsigned_integer (buf, 4);
+
+ if ((word & 0xfc1f0000) == 0xb41e0000 /* stq reg,n($sp) */
+ && (word & 0xffff0000) != 0xb7fe0000) /* reg != $zero */
+ {
+ pcreg = (word & 0x03e00000) >> 21;
+ break;
+ }
+ }
+ }
+
if (has_frame_reg)
PROC_FRAME_REG(&temp_proc_desc) = GCC_FP_REGNUM;
else
***************
*** 389,395 ****
PROC_FRAME_REG(&temp_proc_desc) = SP_REGNUM;
PROC_FRAME_OFFSET(&temp_proc_desc) = frame_size;
PROC_REG_MASK(&temp_proc_desc) = reg_mask;
! PROC_PC_REG(&temp_proc_desc) = RA_REGNUM;
PROC_LOCALOFF(&temp_proc_desc) = 0; /* XXX - bogus */
return &temp_proc_desc;
}
--- 424,430 ----
PROC_FRAME_REG(&temp_proc_desc) = SP_REGNUM;
PROC_FRAME_OFFSET(&temp_proc_desc) = frame_size;
PROC_REG_MASK(&temp_proc_desc) = reg_mask;
! PROC_PC_REG(&temp_proc_desc) = (pcreg == -1) ? RA_REGNUM : pcreg;
PROC_LOCALOFF(&temp_proc_desc) = 0; /* XXX - bogus */
return &temp_proc_desc;
}
***************
*** 530,535 ****
--- 565,571 ----
{
PROC_LOCALOFF (found_heuristic) =
PROC_LOCALOFF (proc_desc);
+ PROC_PC_REG (found_heuristic) = PROC_PC_REG (proc_desc);
proc_desc = found_heuristic;
}
}
***************
*** 613,625 ****
frame->next ? cached_proc_desc : find_proc_desc(frame->pc, frame->next);
frame->saved_regs = NULL;
! frame->proc_desc =
! proc_desc == &temp_proc_desc ? 0 : proc_desc;
if (proc_desc)
{
! /* Get the locals offset from the procedure descriptor, it is valid
! even if we are in the middle of the prologue. */
frame->localoff = PROC_LOCALOFF(proc_desc);
/* Fixup frame-pointer - only needed for top frame */
--- 649,664 ----
frame->next ? cached_proc_desc : find_proc_desc(frame->pc, frame->next);
frame->saved_regs = NULL;
! frame->localoff = 0;
! frame->pc_reg = RA_REGNUM;
! frame->proc_desc = proc_desc == &temp_proc_desc ? 0 : proc_desc;
if (proc_desc)
{
! /* Get the locals offset and the saved pc register from the
! procedure descriptor, they are valid even if we are in the
! middle of the prologue. */
frame->localoff = PROC_LOCALOFF(proc_desc);
+ frame->pc_reg = PROC_PC_REG(proc_desc);
/* Fixup frame-pointer - only needed for top frame */
***************
*** 639,649 ****
if (proc_desc == &temp_proc_desc)
{
! frame->saved_regs = (struct frame_saved_regs*)
! obstack_alloc (&frame_cache_obstack,
! sizeof (struct frame_saved_regs));
! *frame->saved_regs = temp_saved_regs;
! frame->saved_regs->regs[PC_REGNUM] = frame->saved_regs->regs[RA_REGNUM];
}
}
}
--- 678,699 ----
if (proc_desc == &temp_proc_desc)
{
! char *name;
!
! /* Do not set the saved registers for a sigtramp frame,
! alpha_find_saved_registers will do that for us.
! We can't use frame->signal_handler_caller, it is not yet set. */
! find_pc_partial_function (frame->pc, &name,
! (CORE_ADDR *)NULL,(CORE_ADDR *)NULL);
! if (!IN_SIGTRAMP (frame->pc, name))
! {
! frame->saved_regs = (struct frame_saved_regs*)
! obstack_alloc (&frame_cache_obstack,
! sizeof (struct frame_saved_regs));
! *frame->saved_regs = temp_saved_regs;
! frame->saved_regs->regs[PC_REGNUM]
! = frame->saved_regs->regs[RA_REGNUM];
! }
}
}
}
*** gdb-4.15/gdb/blockframe.c.orig Wed Aug 2 05:13:43 1995
--- gdb-4.15/gdb/blockframe.c Fri Nov 17 17:02:12 1995
***************
*** 734,740 ****
I don't really understand the reasoning behind the magic handling
for mst_trampoline symbols. */
! #ifdef INHIBIT_SUNSOLIB_TRANSFER_TABLE_HACK
cache_pc_function_low = SYMBOL_VALUE_ADDRESS (msymbol);
#else
if (msymbol -> type == mst_text || msymbol -> type == mst_file_text)
--- 734,740 ----
I don't really understand the reasoning behind the magic handling
for mst_trampoline symbols. */
! #if 1
cache_pc_function_low = SYMBOL_VALUE_ADDRESS (msymbol);
#else
if (msymbol -> type == mst_text || msymbol -> type == mst_file_text)
*** gdb-4.15/gdb/config/alpha/tm-alpha.h.orig Wed Aug 2 05:27:06 1995
--- gdb-4.15/gdb/config/alpha/tm-alpha.h Tue Oct 17 22:00:52 1995
***************
*** 401,406 ****
--- 401,407 ----
#define EXTRA_FRAME_INFO \
int localoff; \
+ int pc_reg; \
alpha_extra_func_info_t proc_desc; \
struct frame_saved_regs *saved_regs;
***************
*** 433,437 ****
--- 434,442 ----
#ifndef VM_MIN_ADDRESS
#define VM_MIN_ADDRESS (CORE_ADDR)0x120000000
#endif
+
+ /* If PC is in a shared library trampoline code, return the PC
+ where the function itself actually starts. If not, return 0. */
+ #define SKIP_TRAMPOLINE_CODE(pc) find_solib_trampoline_target (pc)
#endif /* TM_ALPHA_H */
*** gdb-4.15/gdb/mipsread.c.orig Wed Aug 2 05:19:53 1995
--- gdb-4.15/gdb/mipsread.c Fri Nov 17 17:02:12 1995
***************
*** 118,123 ****
--- 118,137 ----
install_minimal_symbols (objfile);
+ if (mainline
+ && objfile->ei.entry_point != INVALID_ENTRY_POINT
+ && objfile->ei.entry_file_lowpc == INVALID_ENTRY_LOWPC)
+ {
+ struct minimal_symbol *m;
+
+ m = lookup_minimal_symbol_by_pc (objfile->ei.entry_point);
+ if (m && SYMBOL_NAME (m + 1))
+ {
+ objfile->ei.entry_file_lowpc = SYMBOL_VALUE_ADDRESS (m);
+ objfile->ei.entry_file_highpc = SYMBOL_VALUE_ADDRESS (m + 1);
+ }
+ }
+
do_cleanups (back_to);
}
***************
*** 309,320 ****
break;
else if (dyn_tag == DT_MIPS_LOCAL_GOTNO)
{
! dt_mips_local_gotno = bfd_h_get_32 (abfd,
! (bfd_byte *) x_dynp->d_un.d_val);
}
else if (dyn_tag == DT_MIPS_GOTSYM)
{
! dt_mips_gotsym = bfd_h_get_32 (abfd, (bfd_byte *) x_dynp->d_un.d_val);
}
}
if (dt_mips_local_gotno < 0 || dt_mips_gotsym < 0)
--- 323,337 ----
break;
else if (dyn_tag == DT_MIPS_LOCAL_GOTNO)
{
! if (dt_mips_local_gotno < 0)
! dt_mips_local_gotno
! = bfd_h_get_32 (abfd, (bfd_byte *) x_dynp->d_un.d_val);
}
else if (dyn_tag == DT_MIPS_GOTSYM)
{
! if (dt_mips_gotsym < 0)
! dt_mips_gotsym
! = bfd_h_get_32 (abfd, (bfd_byte *) x_dynp->d_un.d_val);
}
}
if (dt_mips_local_gotno < 0 || dt_mips_gotsym < 0)
*** gdb-4.15/gdb/symfile.c.orig Wed Aug 2 05:23:56 1995
--- gdb-4.15/gdb/symfile.c Fri Nov 17 17:02:13 1995
***************
*** 301,309 ****
{
/* Examination of non-executable.o files. Short-circuit this stuff. */
objfile -> ei.entry_point = INVALID_ENTRY_POINT;
- objfile -> ei.entry_file_lowpc = INVALID_ENTRY_LOWPC;
- objfile -> ei.entry_file_highpc = INVALID_ENTRY_HIGHPC;
}
}
/* Get current entry point address. */
--- 301,313 ----
{
/* Examination of non-executable.o files. Short-circuit this stuff. */
objfile -> ei.entry_point = INVALID_ENTRY_POINT;
}
+ objfile -> ei.entry_file_lowpc = INVALID_ENTRY_LOWPC;
+ objfile -> ei.entry_file_highpc = INVALID_ENTRY_HIGHPC;
+ objfile -> ei.entry_func_lowpc = INVALID_ENTRY_LOWPC;
+ objfile -> ei.entry_func_highpc = INVALID_ENTRY_HIGHPC;
+ objfile -> ei.main_func_lowpc = INVALID_ENTRY_LOWPC;
+ objfile -> ei.main_func_highpc = INVALID_ENTRY_HIGHPC;
}
/* Get current entry point address. */
*** gdb-4.15/gdb/top.c.orig Fri Oct 6 22:25:37 1995
--- gdb-4.15/gdb/top.c Tue Dec 12 20:17:20 1995
***************
*** 1820,1825 ****
--- 1820,1826 ----
init_signals ()
{
signal (SIGINT, request_quit);
+ signal (SIGTRAP, SIG_DFL);
/* If we initialize SIGQUIT to SIG_IGN, then the SIG_IGN will get
passed to the inferior, which we don't want. It would be
>
>
> Dear gdb-users,
>
> I'm running digital unix 3.2c and osf v 2.0. It seems like or gbd isn't
> working anymore for osf 3.2C, or osf 3.2C has a broken file. I'm not sure.
>
> a case:
> #include <stdio.h>
>
> main()
> {
> puts("hi there");
> }
>
>
>
> one of the step in the compilation procedure is linking:
> ld -g2 -O1 -call_shared /usr/lib/cmplrs/cc/crt0.o test.o -lc
> This is done automatically by the cc or gcc command.
>
> procedure 1:
> ------------
> When I use the /usr/lib/cmplrs/cc/crt0.o from osf 3.2C then i get this
> result:
> colle@krtkg1> ld -g2 -O1 -call_shared /usr/lib/cmplrs/cc/crt0.o test.o -lc
> colle@krtkg1> gdb a.out
> 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 4.15.1 (alpha-dec-osf3.2), Copyright 1995 Free Software Foundation,
> Inc...
> (gdb) b 5
> Breakpoint 1 at 0x1200011a0: file test.c, line 5.
> (gdb) run
> Starting program: /usr/users/colle/ircdir/a.out
>
> Breakpoint 1, main () at test.c:5
> 5 puts("hi there");
> (gdb) ba
> #0 main () at test.c:5
> #1 0x120001120 in __start ()
> #2 0x120001120 in __start ()
> #3 0x120001120 in __start ()
> #4 0x120001120 in __start ()
> #5 0x120001120 in __start ()
> #6 0x120001120 in __start ()
> #7 0x120001120 in __start ()
> #8 0x120001120 in __start ()
> #9 0x120001120 in __start ()
> #10 0x120001120 in __start ()
> #11 0x120001120 in __start ()
> #12 0x120001120 in __start ()
> #13 0x120001120 in __start ()
> #14 0x120001120 in __start ()
> #15 0x120001120 in __start ()
> #16 0x120001120 in __start ()
> #17 0x120001120 in __start ()
> #18 0x120001120 in __start ()
> #19 0x120001120 in __start ()
> #20 0x120001120 in __start ()
> #21 0x120001120 in __start ()
> #22 0x120001120 in __start ()
> ---Type <return> to continue, or q <return> to quit---
>
>
> and so on ....
>
>
>
> procedure 2:
> ------------
> If otherwise i use the //usr/lib/cmplrs/cc/crt0.o from a machine with osf
> v2.0 then I get this result (/krtkg4 is /usr on the other machine):
> colle@krtkg1> ld -g2 -O1 -call_shared /krtkg4/lib/cmplrs/cc/crt0.o
> test.o -lc
> colle@krtkg1> gdb a.out
> 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 4.15.1 (alpha-dec-osf3.2), Copyright 1995 Free Software Foundation,
> Inc...
> (gdb) b 5
> Breakpoint 1 at 0x1200010f0: file test.c, line 5.
> (gdb) run
> Starting program: /usr/users/colle/ircdir/a.out
>
> Breakpoint 1, main () at test.c:5
> 5 puts("hi there");
> (gdb) ba
> #0 main () at test.c:5
> (gdb)
>
>
> As you can see the second result is what I want! Both linkings were done
> on the same machine, with the same linker, but with a different crt0.o file
>
> The question is:
> ----------------
> Is gdb buggy for this crt0.o file, or is it the new digital unix 3.2C?
>
> I have 2 machines with the new osf release. One is an older machine which
> I reinstalled from scratch a few weeks ago, and the other one is a brand
> new one with the osf installed by digital.
> The third machine is still running osf v2.0.
> I tell this because I heard people who are running gdb on a 3.x machine
> without problems. I think they didn't install from scratch and I think
> they probably have an old crt0.o file
>
> Is anyone able to tell me if gdb is bad? or is that new crt0.o file?
>
> Any help is appreciated.
>
> Thanks.
>
>
> | \ =============================================================
> | \ Colle Christophe Phone: +32-(0)9-2403955
> +---- mail: colle@krtkg1.rug.ac.be http://krtkg1.rug.ac.be/~colle
> |
> ----------+ When I'm not in Ghent, Then I'm probably Sailing
> \________| ======= Radiotherapy Department, Ghent =============
>
>
--
Peter Schauer pes@regent.e-technik.tu-muenchen.de
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