/* S390 native-dependent code for GDB, the GNU debugger.
- Copyright (C) 2001-2016 Free Software Foundation, Inc.
+ Copyright (C) 2001-2018 Free Software Foundation, Inc.
Contributed by D.J. Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)
for IBM Deutschland Entwicklung GmbH, IBM Corporation.
#include "nat/linux-ptrace.h"
#include "gdbcmd.h"
+#include "s390-tdep.h"
#include "s390-linux-tdep.h"
#include "elf/common.h"
#include <sys/procfs.h>
#include <sys/ucontext.h>
#include <elf.h>
+#include <algorithm>
+#include "inf-ptrace.h"
/* Per-thread arch-specific data. */
static int have_regset_system_call = 0;
static int have_regset_tdb = 0;
static int have_regset_vxrs = 0;
+static int have_regset_gs = 0;
/* Register map for 32-bit executables running under a 64-bit
kernel. */
#define S390_PSWA_OFFSET 8
#endif
+/* PER-event mask bits and PER control bits (CR9). */
+
+#define PER_BIT(n) (1UL << (63 - (n)))
+#define PER_EVENT_BRANCH PER_BIT (32)
+#define PER_EVENT_IFETCH PER_BIT (33)
+#define PER_EVENT_STORE PER_BIT (34)
+#define PER_EVENT_NULLIFICATION PER_BIT (39)
+#define PER_CONTROL_BRANCH_ADDRESS PER_BIT (40)
+#define PER_CONTROL_SUSPENSION PER_BIT (41)
+#define PER_CONTROL_ALTERATION PER_BIT (42)
+
+
/* Fill GDB's register array with the general-purpose register values
in *REGP.
supply_gregset (struct regcache *regcache, const gregset_t *regp)
{
#ifdef __s390x__
- struct gdbarch *gdbarch = get_regcache_arch (regcache);
+ struct gdbarch *gdbarch = regcache->arch ();
if (gdbarch_ptr_bit (gdbarch) == 32)
{
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
fill_gregset (const struct regcache *regcache, gregset_t *regp, int regno)
{
#ifdef __s390x__
- struct gdbarch *gdbarch = get_regcache_arch (regcache);
+ struct gdbarch *gdbarch = regcache->arch ();
if (gdbarch_ptr_bit (gdbarch) == 32)
{
regcache_collect_regset (&s390_64_gregset, regcache, regno,
s390_linux_fetch_inferior_registers (struct target_ops *ops,
struct regcache *regcache, int regnum)
{
- int tid = s390_inferior_tid ();
+ pid_t tid = get_ptrace_pid (regcache_get_ptid (regcache));
if (regnum == -1 || S390_IS_GREGSET_REGNUM (regnum))
fetch_regs (regcache, tid);
if (have_regset_last_break)
if (regnum == -1 || regnum == S390_LAST_BREAK_REGNUM)
fetch_regset (regcache, tid, NT_S390_LAST_BREAK, 8,
- (gdbarch_ptr_bit (get_regcache_arch (regcache)) == 32
+ (gdbarch_ptr_bit (regcache->arch ()) == 32
? &s390_last_break_regset : &s390x_last_break_regset));
if (have_regset_system_call)
fetch_regset (regcache, tid, NT_S390_VXRS_HIGH, 16 * 16,
&s390_vxrs_high_regset);
}
+
+ if (have_regset_gs)
+ {
+ if (regnum == -1 || (regnum >= S390_GSD_REGNUM
+ && regnum <= S390_GSEPLA_REGNUM))
+ fetch_regset (regcache, tid, NT_S390_GS_CB, 4 * 8,
+ &s390_gs_regset);
+ if (regnum == -1 || (regnum >= S390_BC_GSD_REGNUM
+ && regnum <= S390_BC_GSEPLA_REGNUM))
+ fetch_regset (regcache, tid, NT_S390_GS_BC, 4 * 8,
+ &s390_gsbc_regset);
+ }
}
/* Store register REGNUM back into the child process. If REGNUM is
s390_linux_store_inferior_registers (struct target_ops *ops,
struct regcache *regcache, int regnum)
{
- int tid = s390_inferior_tid ();
+ pid_t tid = get_ptrace_pid (regcache_get_ptid (regcache));
if (regnum == -1 || S390_IS_GREGSET_REGNUM (regnum))
store_regs (regcache, tid, regnum);
struct s390_debug_reg_state
{
VEC_s390_watch_area *watch_areas;
+ VEC_s390_watch_area *break_areas;
};
/* Per-process data. */
if (proc->pid == pid)
{
VEC_free (s390_watch_area, proc->state.watch_areas);
+ VEC_free (s390_watch_area, proc->state.break_areas);
*proc_link = proc->next;
xfree (proc);
return;
child_state->watch_areas = VEC_copy (s390_watch_area,
parent_state->watch_areas);
+ child_state->break_areas = VEC_copy (s390_watch_area,
+ parent_state->break_areas);
}
/* Dump PER state. */
s390_watch_area *area;
struct arch_lwp_info *lp_priv = lwp_arch_private_info (lp);
struct s390_debug_reg_state *state = s390_get_debug_reg_state (pid);
+ int step = lwp_is_stepping (lp);
- if (lp_priv == NULL || !lp_priv->per_info_changed)
+ /* Nothing to do if there was never any PER info for this thread. */
+ if (lp_priv == NULL)
return;
+ /* If PER info has changed, update it. When single-stepping, disable
+ hardware breakpoints (if any). Otherwise we're done. */
+ if (!lp_priv->per_info_changed)
+ {
+ if (!step || VEC_empty (s390_watch_area, state->break_areas))
+ return;
+ }
+
lp_priv->per_info_changed = 0;
tid = ptid_get_lwp (ptid_of_lwp (lp));
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 watchpoint status"));
+
+ /* Clear PER info, but adjust the single_step field (used by older
+ kernels only). */
+ memset (&per_info, 0, sizeof (per_info));
+ per_info.single_step = (step != 0);
if (!VEC_empty (s390_watch_area, state->watch_areas))
{
VEC_iterate (s390_watch_area, state->watch_areas, ix, area);
ix++)
{
- watch_lo_addr = min (watch_lo_addr, area->lo_addr);
- watch_hi_addr = max (watch_hi_addr, area->hi_addr);
+ watch_lo_addr = std::min (watch_lo_addr, area->lo_addr);
+ watch_hi_addr = std::max (watch_hi_addr, area->hi_addr);
}
- per_info.control_regs.bits.em_storage_alteration = 1;
- per_info.control_regs.bits.storage_alt_space_ctl = 1;
+ /* Enable storage-alteration events. */
+ per_info.control_regs.words.cr[0] |= (PER_EVENT_STORE
+ | PER_CONTROL_ALTERATION);
}
- else
+
+ if (!VEC_empty (s390_watch_area, state->break_areas))
{
- per_info.control_regs.bits.em_storage_alteration = 0;
- per_info.control_regs.bits.storage_alt_space_ctl = 0;
+ /* Don't install hardware breakpoints while single-stepping, since
+ our PER settings (e.g. the nullification bit) might then conflict
+ with the kernel's. But re-install them afterwards. */
+ if (step)
+ lp_priv->per_info_changed = 1;
+ else
+ {
+ for (ix = 0;
+ VEC_iterate (s390_watch_area, state->break_areas, ix, area);
+ ix++)
+ {
+ watch_lo_addr = std::min (watch_lo_addr, area->lo_addr);
+ watch_hi_addr = std::max (watch_hi_addr, area->hi_addr);
+ }
+
+ /* If there's just one breakpoint, enable instruction-fetching
+ nullification events for the breakpoint address (fast).
+ Otherwise stop after any instruction within the PER area and
+ after any branch into it (slow). */
+ if (watch_hi_addr == watch_lo_addr)
+ per_info.control_regs.words.cr[0] |= (PER_EVENT_NULLIFICATION
+ | PER_EVENT_IFETCH);
+ else
+ {
+ /* The PER area must include the instruction before the
+ first breakpoint address. */
+ watch_lo_addr = watch_lo_addr > 6 ? watch_lo_addr - 6 : 0;
+ per_info.control_regs.words.cr[0]
+ |= (PER_EVENT_BRANCH
+ | PER_EVENT_IFETCH
+ | PER_CONTROL_BRANCH_ADDRESS);
+ }
+ }
}
per_info.starting_addr = watch_lo_addr;
per_info.ending_addr = watch_hi_addr;
s390_mark_per_info_changed (lp);
}
+/* Function to call when a thread is being deleted. */
+
+static void
+s390_delete_thread (struct arch_lwp_info *arch_lwp)
+{
+ xfree (arch_lwp);
+}
+
/* Iterator callback for s390_refresh_per_info. */
static int
return -1;
}
+/* Implement the "can_use_hw_breakpoint" target_ops method. */
+
static int
s390_can_use_hw_breakpoint (struct target_ops *self,
enum bptype type, int cnt, int othertype)
{
- return type == bp_hardware_watchpoint;
+ if (type == bp_hardware_watchpoint || type == bp_hardware_breakpoint)
+ return 1;
+ return 0;
+}
+
+/* Implement the "insert_hw_breakpoint" target_ops method. */
+
+static int
+s390_insert_hw_breakpoint (struct target_ops *self,
+ struct gdbarch *gdbarch,
+ struct bp_target_info *bp_tgt)
+{
+ s390_watch_area area;
+ struct s390_debug_reg_state *state;
+
+ area.lo_addr = bp_tgt->placed_address = bp_tgt->reqstd_address;
+ area.hi_addr = area.lo_addr;
+ state = s390_get_debug_reg_state (ptid_get_pid (inferior_ptid));
+ VEC_safe_push (s390_watch_area, state->break_areas, &area);
+
+ return s390_refresh_per_info ();
+}
+
+/* Implement the "remove_hw_breakpoint" target_ops method. */
+
+static int
+s390_remove_hw_breakpoint (struct target_ops *self,
+ struct gdbarch *gdbarch,
+ struct bp_target_info *bp_tgt)
+{
+ unsigned ix;
+ struct watch_area *area;
+ struct s390_debug_reg_state *state;
+
+ state = s390_get_debug_reg_state (ptid_get_pid (inferior_ptid));
+ for (ix = 0;
+ VEC_iterate (s390_watch_area, state->break_areas, ix, area);
+ ix++)
+ {
+ if (area->lo_addr == bp_tgt->placed_address)
+ {
+ VEC_unordered_remove (s390_watch_area, state->break_areas, ix);
+ return s390_refresh_per_info ();
+ }
+ }
+
+ fprintf_unfiltered (gdb_stderr,
+ "Attempt to remove nonexistent breakpoint.\n");
+ return -1;
}
static int
&& check_regset (tid, NT_S390_VXRS_LOW, 16 * 8)
&& check_regset (tid, NT_S390_VXRS_HIGH, 16 * 16);
+ have_regset_gs = (hwcap & HWCAP_S390_GS)
+ && check_regset (tid, NT_S390_GS_CB, 4 * 8)
+ && check_regset (tid, NT_S390_GS_BC, 4 * 8);
+
if (s390_target_wordsize () == 8)
- return (have_regset_vxrs ?
+ return (have_regset_gs ? tdesc_s390x_gs_linux64 :
+ have_regset_vxrs ?
(have_regset_tdb ? tdesc_s390x_tevx_linux64 :
tdesc_s390x_vx_linux64) :
have_regset_tdb ? tdesc_s390x_te_linux64 :
tdesc_s390x_linux64);
if (hwcap & HWCAP_S390_HIGH_GPRS)
- return (have_regset_vxrs ?
+ return (have_regset_gs ? tdesc_s390_gs_linux64 :
+ have_regset_vxrs ?
(have_regset_tdb ? tdesc_s390_tevx_linux64 :
tdesc_s390_vx_linux64) :
have_regset_tdb ? tdesc_s390_te_linux64 :
tdesc_s390_linux32);
}
-void _initialize_s390_nat (void);
-
void
_initialize_s390_nat (void)
{
/* Add our watchpoint methods. */
t->to_can_use_hw_breakpoint = s390_can_use_hw_breakpoint;
+ t->to_insert_hw_breakpoint = s390_insert_hw_breakpoint;
+ t->to_remove_hw_breakpoint = s390_remove_hw_breakpoint;
t->to_region_ok_for_hw_watchpoint = s390_region_ok_for_hw_watchpoint;
t->to_have_continuable_watchpoint = 1;
t->to_stopped_by_watchpoint = s390_stopped_by_watchpoint;
/* Register the target. */
linux_nat_add_target (t);
linux_nat_set_new_thread (t, s390_new_thread);
+ linux_nat_set_delete_thread (t, s390_delete_thread);
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);
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