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Add hardware watchpoint support for x86 GNU Hurd.

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gdb/
	* config/i386/i386gnu.mh (NATDEPFILES): Add x86-nat.o and
	x86-dregs.o.
	* gnu-nat.c (inf_threads): New function.
	* gnu-nat.h (inf_threads_ftype): New typedef.
	(inf_threads): New declaration.
	* i386gnu-nat.c: Include "x86-nat.h" and "inf-child.h".
	[i386_DEBUG_STATE] (i386_gnu_dr_get, i386_gnu_dr_set)
	(i386_gnu_dr_set_control_one, i386_gnu_dr_set_control)
	(i386_gnu_dr_set_addr_one, i386_gnu_dr_set_addr)
	(i386_gnu_dr_get_reg, i386_gnu_dr_get_addr, 386_gnu_dr_get_status)
	(i386_gnu_dr_get_control): New functions.
	(reg_addr): New structure.
	(_initialize_i386gnu_nat) [i386_DEBUG_STATE]: Initialize hardware
	i386 debugging register hooks.
	* NEWS: Mention this.
This commit is contained in:
Samuel Thibault 2014-09-12 20:29:11 +02:00 • committed by Thomas Schwinge
parent 70e99720f9
commit 05db5edd79
6 changed files with 188 additions and 1 deletions
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150
gdb/i386gnu-nat.c
View file

@ -18,6 +18,7 @@
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "x86-nat.h"
#include "inferior.h"
#include "floatformat.h"
#include "regcache.h"
@ -30,6 +31,7 @@
#include "i386-tdep.h"
#include "gnu-nat.h"
#include "inf-child.h"
#include "i387-tdep.h"
#ifdef HAVE_SYS_PROCFS_H
@ -304,6 +306,142 @@ gnu_store_registers (struct target_ops *ops,
}
}
/* Support for debug registers. */
#ifdef i386_DEBUG_STATE
/* Get debug registers for thread THREAD. */
static void
i386_gnu_dr_get (struct i386_debug_state *regs, struct proc *thread)
{
mach_msg_type_number_t count = i386_DEBUG_STATE_COUNT;
error_t err;
err = thread_get_state (thread->port, i386_DEBUG_STATE,
(thread_state_t) regs, &count);
if (err != 0 || count != i386_DEBUG_STATE_COUNT)
warning (_("Couldn't fetch debug state from %s"),
proc_string (thread));
}
/* Set debug registers for thread THREAD. */
static void
i386_gnu_dr_set (const struct i386_debug_state *regs, struct proc *thread)
{
error_t err;
err = thread_set_state (thread->port, i386_DEBUG_STATE,
(thread_state_t) regs, i386_DEBUG_STATE_COUNT);
if (err != 0)
warning (_("Couldn't store debug state into %s"),
proc_string (thread));
}
/* Set DR_CONTROL in THREAD. */
static void
i386_gnu_dr_set_control_one (struct proc *thread, void *arg)
{
unsigned long *control = arg;
struct i386_debug_state regs;
i386_gnu_dr_get (&regs, thread);
regs.dr[DR_CONTROL] = *control;
i386_gnu_dr_set (&regs, thread);
}
/* Set DR_CONTROL to CONTROL in all threads. */
static void
i386_gnu_dr_set_control (unsigned long control)
{
inf_update_procs (gnu_current_inf);
inf_threads (gnu_current_inf, i386_gnu_dr_set_control_one, &control);
}
/* Parameters to set a debugging address. */
struct reg_addr
{
int regnum; /* Register number (zero based). */
CORE_ADDR addr; /* Address. */
};
/* Set address REGNUM (zero based) to ADDR in THREAD. */
static void
i386_gnu_dr_set_addr_one (struct proc *thread, void *arg)
{
struct reg_addr *reg_addr = arg;
struct i386_debug_state regs;
i386_gnu_dr_get (&regs, thread);
regs.dr[reg_addr->regnum] = reg_addr->addr;
i386_gnu_dr_set (&regs, thread);
}
/* Set address REGNUM (zero based) to ADDR in all threads. */
static void
i386_gnu_dr_set_addr (int regnum, CORE_ADDR addr)
{
struct reg_addr reg_addr;
gdb_assert (DR_FIRSTADDR <= regnum && regnum <= DR_LASTADDR);
reg_addr.regnum = regnum;
reg_addr.addr = addr;
inf_update_procs (gnu_current_inf);
inf_threads (gnu_current_inf, i386_gnu_dr_set_addr_one, &reg_addr);
}
/* Get debug register REGNUM value from only the one LWP of PTID. */
static unsigned long
i386_gnu_dr_get_reg (ptid_t ptid, int regnum)
{
struct i386_debug_state regs;
struct proc *thread;
/* Make sure we know about new threads. */
inf_update_procs (gnu_current_inf);
thread = inf_tid_to_thread (gnu_current_inf, ptid_get_lwp (ptid));
i386_gnu_dr_get (&regs, thread);
return regs.dr[regnum];
}
/* Return the inferior's debug register REGNUM. */
static CORE_ADDR
i386_gnu_dr_get_addr (int regnum)
{
gdb_assert (DR_FIRSTADDR <= regnum && regnum <= DR_LASTADDR);
return i386_gnu_dr_get_reg (inferior_ptid, regnum);
}
/* Get DR_STATUS from only the one thread of INFERIOR_PTID. */
static unsigned long
i386_gnu_dr_get_status (void)
{
return i386_gnu_dr_get_reg (inferior_ptid, DR_STATUS);
}
/* Return the inferior's DR7 debug control register. */
static unsigned long
i386_gnu_dr_get_control (void)
{
return i386_gnu_dr_get_reg (inferior_ptid, DR_CONTROL);
}
#endif /* i386_DEBUG_STATE */
/* Provide a prototype to silence -Wmissing-prototypes. */
extern initialize_file_ftype _initialize_i386gnu_nat;
@ -315,6 +453,18 @@ _initialize_i386gnu_nat (void)
/* Fill in the generic GNU/Hurd methods. */
t = gnu_target ();
#ifdef i386_DEBUG_STATE
x86_use_watchpoints (t);
x86_dr_low.set_control = i386_gnu_dr_set_control;
gdb_assert (DR_FIRSTADDR == 0 && DR_LASTADDR < i386_DEBUG_STATE_COUNT);
x86_dr_low.set_addr = i386_gnu_dr_set_addr;
x86_dr_low.get_addr = i386_gnu_dr_get_addr;
x86_dr_low.get_status = i386_gnu_dr_get_status;
x86_dr_low.get_control = i386_gnu_dr_get_control;
x86_set_debug_register_length (4);
#endif /* i386_DEBUG_STATE */
t->to_fetch_registers = gnu_fetch_registers;
t->to_store_registers = gnu_store_registers;