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S390: Enable "maint set show-debug-regs"

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Implement a new function for dumping the S390 "debug
registers" (actually, the PER info) and invoke it at appropriate places.
Respect the variable show_debug_regs and make it settable by the user.

gdb/ChangeLog:

	* s390-linux-nat.c (gdbcmd.h): New include.
	(s390_show_debug_regs): New function.
	(s390_stopped_by_watchpoint): Call it, if show_debug_regs is set.
	(s390_prepare_to_resume): Likewise.
	(_initialize_s390_nat): Register the command "maint set
	show-debug-regs".
This commit is contained in:
Andreas Arnez 2016-09-16 19:25:55 +02:00
parent 373c3dad74
commit 169fe0df15
2 changed files with 60 additions and 0 deletions
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9
gdb/ChangeLog
View File

@ -1,3 +1,12 @@
2016-09-16 Andreas Arnez <arnez@linux.vnet.ibm.com>
* s390-linux-nat.c (gdbcmd.h): New include.
(s390_show_debug_regs): New function.
(s390_stopped_by_watchpoint): Call it, if show_debug_regs is set.
(s390_prepare_to_resume): Likewise.
(_initialize_s390_nat): Register the command "maint set
show-debug-regs".
2016-09-16 Andreas Arnez <arnez@linux.vnet.ibm.com>
* s390-linux-nat.c (watch_areas): Remove variable. Replace by a

51
gdb/s390-linux-nat.c
View File

@ -28,6 +28,7 @@
#include "gregset.h"
#include "regset.h"
#include "nat/linux-ptrace.h"
#include "gdbcmd.h"
#include "s390-linux-tdep.h"
#include "elf/common.h"
@ -565,6 +566,37 @@ s390_linux_new_fork (struct lwp_info *parent, pid_t child_pid)
parent_state->watch_areas);
}
/* Dump PER state. */
static void
s390_show_debug_regs (int tid, const char *where)
{
per_struct per_info;
ptrace_area parea;
parea.len = sizeof (per_info);
parea.process_addr = (addr_t) &per_info;
parea.kernel_addr = offsetof (struct user_regs_struct, per_info);
if (ptrace (PTRACE_PEEKUSR_AREA, tid, &parea, 0) < 0)
perror_with_name (_("Couldn't retrieve debug regs"));
debug_printf ("PER (debug) state for %d -- %s\n"
" cr9-11: %lx %lx %lx\n"
" start, end: %lx %lx\n"
" code/ATMID: %x address: %lx PAID: %x\n",
tid,
where,
per_info.control_regs.words.cr[0],
per_info.control_regs.words.cr[1],
per_info.control_regs.words.cr[2],
per_info.starting_addr,
per_info.ending_addr,
per_info.lowcore.words.perc_atmid,
per_info.lowcore.words.address,
per_info.lowcore.words.access_id);
}
static int
s390_stopped_by_watchpoint (struct target_ops *ops)
{
@ -574,6 +606,9 @@ s390_stopped_by_watchpoint (struct target_ops *ops)
ptrace_area parea;
int result;
if (show_debug_regs)
s390_show_debug_regs (s390_inferior_tid (), "stop");
/* Speed up common case. */
if (VEC_empty (s390_watch_area, state->watch_areas))
return 0;
@ -653,6 +688,9 @@ s390_prepare_to_resume (struct lwp_info *lp)
if (ptrace (PTRACE_POKEUSR_AREA, tid, &parea, 0) < 0)
perror_with_name (_("Couldn't modify watchpoint status"));
if (show_debug_regs)
s390_show_debug_regs (tid, "resume");
}
/* Mark the PER info as changed, so the next resume will update it. */
@ -882,4 +920,17 @@ _initialize_s390_nat (void)
linux_nat_set_prepare_to_resume (t, s390_prepare_to_resume);
linux_nat_set_forget_process (t, s390_forget_process);
linux_nat_set_new_fork (t, s390_linux_new_fork);
/* A maintenance command to enable showing the PER state. */
add_setshow_boolean_cmd ("show-debug-regs", class_maintenance,
&show_debug_regs, _("\
Set whether to show the PER (debug) hardware state."), _("\
Show whether to show the PER (debug) hardware state."), _("\
Use \"on\" to enable, \"off\" to disable.\n\
If enabled, the PER state is shown after it is changed by GDB,\n\
and when the inferior triggers a breakpoint or watchpoint."),
NULL,
NULL,
&maintenance_set_cmdlist,
&maintenance_show_cmdlist);
}