Arm core files with GDB

[Jean-Rene Peulve <jr dot peulve at wanadoo dot fr>]

Hi,
I don't have a completed solution to extract the registers from the core 
file, but the following patch allows me to access the memory chuncks 
captured at the time of the crash. For example, I can do:

[jrp@dev gdb-6.4.50.20060405-arm]$ ./gdb/gdb -c /tmp/core.main
...
This GDB was configured as "--host=i686-pc-linux-gnu --target=arm-elf-linux".

warning: "/tmp/core.main": no core file handler recognizes format, using 
default
Core was generated by `test'.
Program terminated with signal 11, Segmentation fault.
Can't fetch registers from this type of core file
Can't fetch registers from this type of core file
#0  0x00000000 in ?? ()
(gdb) info target
Local core dump file:
        `/tmp/core.main', file type elf32-bigarm.
        0x00024000 - 0x00029000 is load2
        0x00029000 - 0x0002f000 is load3
        0x40014000 - 0x40017000 is load5
        0x4001b000 - 0x4001d000 is load6
        0x4011d000 - 0x4012a000 is load8
        0x4012a000 - 0x4012e000 is load9
        0xbff7f000 - 0xc0000000 is load10
(gdb)



The following patch is when "./configure --target=arm-elf-linux" is used to 
build gdb:

--- gdb/config/arm/linux.mt.orig        2006-05-04 11:37:48.295474800 +0200
+++ gdb/config/arm/linux.mt     2006-05-04 11:35:21.649768336 +0200
@@ -1,3 +1,3 @@
 # Target: ARM based machine running GNU/Linux
 DEPRECATED_TM_FILE= tm-linux.h
-TDEPFILES= arm-tdep.o arm-linux-tdep.o glibc-tdep.o solib.o solib-svr4.o 
solib-legacy.o symfile-mem.o
+TDEPFILES= arm-tdep.o arm-linux-tdep.o glibc-tdep.o solib.o solib-svr4.o 
solib-legacy.o symfile-mem.o corelow.o


The following patch is when "./configure --target=arm-elf" is used to build 
gdb:
--- gdb/config/arm/embed.mt.orig        2006-05-04 11:37:35.876362792 +0200
+++ gdb/config/arm/embed.mt     2006-05-04 11:37:27.742599312 +0200
@@ -1,5 +1,5 @@
 # Target: ARM embedded system
-TDEPFILES= arm-tdep.o remote-rdp.o
+TDEPFILES= arm-tdep.o remote-rdp.o corelow.o
 DEPRECATED_TM_FILE= tm-embed.h

 SIM_OBS = remote-sim.o


I have been forced to apply the following patch as well on the last version 
of gdb I use:

--- gdb/arm-linux-tdep.c.orig   2006-05-04 11:29:44.551015136 +0200
+++ gdb/arm-linux-tdep.c        2006-05-04 11:30:30.963959296 +0200
@@ -79,8 +79,8 @@
    hidden behind the regcache abstraction.  */
 static void
 arm_linux_extract_return_value (struct type *type,
-                               char regbuf[],
-                               char *valbuf)
+                               gdb_byte *regbuf,
+                               gdb_byte *valbuf)
 {
   /* ScottB: This needs to be looked at to handle the different
      floating point emulators on ARM GNU/Linux.  Right now the code



At 10:35 04/05/06, Ernst.Steenbrink@imtech.nl wrote:




> Hi
> I saw your message on:
> http://sourceware.org/ml/gdb/2006-01/msg00042.html
> I was wondering if you solved the problem since I have the same problem.
> Maybe you have some links/advice on how to fix this.
>
> Kind regards,
>
> Ernst.
>
> Ernst Steenbrink
> Imtech ICT Technical Systems
>
> Henry Dunantstraat 38
> 3822 XE Amersfoort
>
> Tel  + 31 (0)33 454 33 51
> Fax + 31 (0)33 454 33 35
> E-mail: ernst.steenbrink@imtech.nl
> Info www.imtechict.nl