Debugging with GDB Manual (5900-1473; WDB 6.2; January 2011)

Following are known issues in mixed mode debugging:
• Listing of registers currently in use for PA-RISC 32-bit shared library frames causes
the unswizzled 32-bit values to be displayed.
• Clicking on the registers tab for a PA-RISC frame in the HP WDB-GUI results in
incorrect register information being displayed. Alternatively, execute the info reg
command at the gdb prompt in the Commands tab.
• For a signal handler invoked while executing in a PA-RISC routine, when the info
frame command is run on the signal handler called frame, the saved
libaries32.so IP address is displayed, rather than the PCOQH value of the
PA-RISC routine.
• Printing the value of a floating point register using the print command does not
work. The info reg command must be used.
NOTE: If an application crashes in the aries signal handler, the debug-aries option
is turned on by default and only the libaries frames are displayed.
14.15.6 Support for mmapfile command
HP-UX does not include mmap-ed regions with MAP_SHARED mappings or MAP_PRIVATE
with Read-Only permission in core. Due to this, any references to this mmap-ed regions
cannot be debugged as the memory image of this region is unavailable to GDB. To solve
this problem, GDB version 6.2 onwards provides a mmapfile command. You can use
this command to add mmap-ed sections while debugging core files. You can do this
during the debug session of the core file, which will help you debug using the memory
contents from the missing mmap-ed regions in core file.
NOTE: The mmapfile command is currently supported only on HP Integrity systems.
The following example illustrates the usage of the mmapfile command:
$ cat mmap.c
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <assert.h>
#include <unistd.h>
#include <sys/fcntl.h>
#include <sys/mman.h>
int main()
{
int devzfd;
int fd, fd2;
char *p, *q, *r, *s, *t, *u;
devzfd = open("/dev/zero", O_RDONLY);
if ( devzfd == -1 )
{
perror("open");
200 HP-UX Configuration-Specific Information