/* S390 native-dependent code for GDB, the GNU debugger.
- Copyright (C) 2001-2017 Free Software Foundation, Inc.
+ Copyright (C) 2001-2024 Free Software Foundation, Inc.
Contributed by D.J. Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)
for IBM Deutschland Entwicklung GmbH, IBM Corporation.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
-#include "defs.h"
+#include "extract-store-integer.h"
#include "regcache.h"
#include "inferior.h"
#include "target.h"
#include "gregset.h"
#include "regset.h"
#include "nat/linux-ptrace.h"
-#include "gdbcmd.h"
+#include "cli/cli-cmds.h"
+#include "gdbarch.h"
+#include "s390-tdep.h"
#include "s390-linux-tdep.h"
#include "elf/common.h"
#include <elf.h>
#include <algorithm>
#include "inf-ptrace.h"
+#include "linux-tdep.h"
/* Per-thread arch-specific data. */
#define PER_CONTROL_SUSPENSION PER_BIT (41)
#define PER_CONTROL_ALTERATION PER_BIT (42)
+class s390_linux_nat_target final : public linux_nat_target
+{
+public:
+ /* Add our register access methods. */
+ void fetch_registers (struct regcache *, int) override;
+ void store_registers (struct regcache *, int) override;
+
+ /* Add our watchpoint methods. */
+ int can_use_hw_breakpoint (enum bptype, int, int) override;
+ int insert_hw_breakpoint (struct gdbarch *, struct bp_target_info *)
+ override;
+ int remove_hw_breakpoint (struct gdbarch *, struct bp_target_info *)
+ override;
+ int region_ok_for_hw_watchpoint (CORE_ADDR, int) override;
+ bool stopped_by_watchpoint () override;
+ int insert_watchpoint (CORE_ADDR, int, enum target_hw_bp_type,
+ struct expression *) override;
+ int remove_watchpoint (CORE_ADDR, int, enum target_hw_bp_type,
+ struct expression *) override;
+
+ /* Detect target architecture. */
+ const struct target_desc *read_description () override;
+ int auxv_parse (const gdb_byte **readptr,
+ const gdb_byte *endptr, CORE_ADDR *typep, CORE_ADDR *valp)
+ override;
+
+ /* Override linux_nat_target low methods. */
+ void low_new_thread (struct lwp_info *lp) override;
+ void low_delete_thread (struct arch_lwp_info *lp) override;
+ void low_prepare_to_resume (struct lwp_info *lp) override;
+ void low_new_fork (struct lwp_info *parent, pid_t child_pid) override;
+ void low_forget_process (pid_t pid) override;
+};
+
+static s390_linux_nat_target the_s390_linux_nat_target;
/* 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);
pswa = extract_unsigned_integer ((const gdb_byte *) regp
+ S390_PSWA_OFFSET, 8, byte_order);
store_unsigned_integer (buf, 4, byte_order, (pswm >> 32) | 0x80000);
- regcache_raw_supply (regcache, S390_PSWM_REGNUM, buf);
+ regcache->raw_supply (S390_PSWM_REGNUM, buf);
store_unsigned_integer (buf, 4, byte_order,
(pswa & 0x7fffffff) | (pswm & 0x80000000));
- regcache_raw_supply (regcache, S390_PSWA_REGNUM, buf);
+ regcache->raw_supply (S390_PSWA_REGNUM, buf);
return;
}
#endif
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,
if (regno == -1 || regno == S390_PSWM_REGNUM)
{
pswm &= 0x80000000;
- regcache_raw_collect (regcache, S390_PSWM_REGNUM, buf);
+ regcache->raw_collect (S390_PSWM_REGNUM, buf);
pswm |= (extract_unsigned_integer (buf, 4, byte_order)
& 0xfff7ffff) << 32;
}
if (regno == -1 || regno == S390_PSWA_REGNUM)
{
- regcache_raw_collect (regcache, S390_PSWA_REGNUM, buf);
+ regcache->raw_collect (S390_PSWA_REGNUM, buf);
pswa = extract_unsigned_integer (buf, 4, byte_order);
pswm ^= (pswm ^ pswa) & 0x80000000;
pswa &= 0x7fffffff;
s390_inferior_tid (void)
{
/* GNU/Linux LWP ID's are process ID's. */
- int tid = ptid_get_lwp (inferior_ptid);
+ int tid = inferior_ptid.lwp ();
if (tid == 0)
- tid = ptid_get_pid (inferior_ptid); /* Not a threaded program. */
+ tid = inferior_ptid.pid (); /* Not a threaded program. */
return tid;
}
/* Fetch register REGNUM from the child process. If REGNUM is -1, do
this for all registers. */
-static void
-s390_linux_fetch_inferior_registers (struct target_ops *ops,
- struct regcache *regcache, int regnum)
+void
+s390_linux_nat_target::fetch_registers (struct regcache *regcache, int regnum)
{
- pid_t tid = get_ptrace_pid (regcache_get_ptid (regcache));
+ pid_t tid = get_ptrace_pid (regcache->ptid ());
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)
/* Store register REGNUM back into the child process. If REGNUM is
-1, do this for all registers. */
-static void
-s390_linux_store_inferior_registers (struct target_ops *ops,
- struct regcache *regcache, int regnum)
+void
+s390_linux_nat_target::store_registers (struct regcache *regcache, int regnum)
{
- pid_t tid = get_ptrace_pid (regcache_get_ptid (regcache));
+ pid_t tid = get_ptrace_pid (regcache->ptid ());
if (regnum == -1 || S390_IS_GREGSET_REGNUM (regnum))
store_regs (regcache, tid, regnum);
The only thing we actually need is the total address space area
spanned by the watchpoints. */
-typedef struct watch_area
+struct watch_area
{
CORE_ADDR lo_addr;
CORE_ADDR hi_addr;
-} s390_watch_area;
-
-DEF_VEC_O (s390_watch_area);
+};
/* Hardware debug state. */
struct s390_debug_reg_state
{
- VEC_s390_watch_area *watch_areas;
- VEC_s390_watch_area *break_areas;
+ std::vector<watch_area> watch_areas;
+ std::vector<watch_area> break_areas;
};
/* Per-process data. */
struct s390_process_info
{
- struct s390_process_info *next;
- pid_t pid;
+ struct s390_process_info *next = nullptr;
+ pid_t pid = 0;
struct s390_debug_reg_state state;
};
static struct s390_process_info *
s390_add_process (pid_t pid)
{
- struct s390_process_info *proc = XCNEW (struct s390_process_info);
+ struct s390_process_info *proc = new struct s390_process_info;
proc->pid = pid;
proc->next = s390_process_list;
/* Called whenever GDB is no longer debugging process PID. It deletes
data structures that keep track of hardware debug state. */
-static void
-s390_forget_process (pid_t pid)
+void
+s390_linux_nat_target::low_forget_process (pid_t pid)
{
struct s390_process_info *proc, **proc_link;
{
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);
+ delete proc;
return;
}
/* linux_nat_new_fork hook. */
-static void
-s390_linux_new_fork (struct lwp_info *parent, pid_t child_pid)
+void
+s390_linux_nat_target::low_new_fork (struct lwp_info *parent, pid_t child_pid)
{
pid_t parent_pid;
struct s390_debug_reg_state *parent_state;
/* GDB core assumes the child inherits the watchpoints/hw breakpoints of
the parent. So copy the debug state from parent to child. */
- parent_pid = ptid_get_pid (parent->ptid);
+ parent_pid = parent->ptid.pid ();
parent_state = s390_get_debug_reg_state (parent_pid);
child_state = s390_get_debug_reg_state (child_pid);
- 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);
+ child_state->watch_areas = parent_state->watch_areas;
+ child_state->break_areas = parent_state->break_areas;
}
/* Dump PER state. */
per_info.lowcore.words.access_id);
}
-static int
-s390_stopped_by_watchpoint (struct target_ops *ops)
+bool
+s390_linux_nat_target::stopped_by_watchpoint ()
{
struct s390_debug_reg_state *state
- = s390_get_debug_reg_state (ptid_get_pid (inferior_ptid));
+ = s390_get_debug_reg_state (inferior_ptid.pid ());
per_lowcore_bits per_lowcore;
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;
+ if (state->watch_areas.empty ())
+ return false;
+
+ siginfo_t siginfo;
+ if (!linux_nat_get_siginfo (inferior_ptid, &siginfo))
+ return false;
+ if (siginfo.si_signo != SIGTRAP
+ || (siginfo.si_code & 0xffff) != TRAP_HWBKPT)
+ return false;
parea.len = sizeof (per_lowcore);
parea.process_addr = (addr_t) & per_lowcore;
if (ptrace (PTRACE_PEEKUSR_AREA, s390_inferior_tid (), &parea, 0) < 0)
perror_with_name (_("Couldn't retrieve watchpoint status"));
- result = (per_lowcore.perc_storage_alteration == 1
- && per_lowcore.perc_store_real_address == 0);
-
- if (result)
- {
- /* Do not report this watchpoint again. */
- memset (&per_lowcore, 0, sizeof (per_lowcore));
- if (ptrace (PTRACE_POKEUSR_AREA, s390_inferior_tid (), &parea, 0) < 0)
- perror_with_name (_("Couldn't clear watchpoint status"));
- }
+ bool result = (per_lowcore.perc_storage_alteration == 1
+ && per_lowcore.perc_store_real_address == 0);
return result;
}
/* Each time before resuming a thread, update its PER info. */
-static void
-s390_prepare_to_resume (struct lwp_info *lp)
+void
+s390_linux_nat_target::low_prepare_to_resume (struct lwp_info *lp)
{
int tid;
- pid_t pid = ptid_get_pid (ptid_of_lwp (lp));
+ pid_t pid = ptid_of_lwp (lp).pid ();
per_struct per_info;
ptrace_area parea;
CORE_ADDR watch_lo_addr = (CORE_ADDR)-1, watch_hi_addr = 0;
- unsigned ix;
- 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);
hardware breakpoints (if any). Otherwise we're done. */
if (!lp_priv->per_info_changed)
{
- if (!step || VEC_empty (s390_watch_area, state->break_areas))
+ if (!step || state->break_areas.empty ())
return;
}
lp_priv->per_info_changed = 0;
- tid = ptid_get_lwp (ptid_of_lwp (lp));
+ tid = ptid_of_lwp (lp).lwp ();
if (tid == 0)
tid = pid;
memset (&per_info, 0, sizeof (per_info));
per_info.single_step = (step != 0);
- if (!VEC_empty (s390_watch_area, state->watch_areas))
+ if (!state->watch_areas.empty ())
{
- for (ix = 0;
- VEC_iterate (s390_watch_area, state->watch_areas, ix, area);
- ix++)
+ for (const auto &area : state->watch_areas)
{
- watch_lo_addr = std::min (watch_lo_addr, area->lo_addr);
- watch_hi_addr = std::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);
}
/* Enable storage-alteration events. */
| PER_CONTROL_ALTERATION);
}
- if (!VEC_empty (s390_watch_area, state->break_areas))
+ if (!state->break_areas.empty ())
{
/* Don't install hardware breakpoints while single-stepping, since
our PER settings (e.g. the nullification bit) might then conflict
lp_priv->per_info_changed = 1;
else
{
- for (ix = 0;
- VEC_iterate (s390_watch_area, state->break_areas, ix, area);
- ix++)
+ for (const auto &area : state->break_areas)
{
- watch_lo_addr = std::min (watch_lo_addr, area->lo_addr);
- watch_hi_addr = std::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);
}
/* If there's just one breakpoint, enable instruction-fetching
/* When attaching to a new thread, mark its PER info as changed. */
-static void
-s390_new_thread (struct lwp_info *lp)
+void
+s390_linux_nat_target::low_new_thread (struct lwp_info *lp)
{
s390_mark_per_info_changed (lp);
}
+/* Function to call when a thread is being deleted. */
+
+void
+s390_linux_nat_target::low_delete_thread (struct arch_lwp_info *arch_lwp)
+{
+ xfree (arch_lwp);
+}
+
/* Iterator callback for s390_refresh_per_info. */
static int
-s390_refresh_per_info_cb (struct lwp_info *lp, void *arg)
+s390_refresh_per_info_cb (struct lwp_info *lp)
{
s390_mark_per_info_changed (lp);
static int
s390_refresh_per_info (void)
{
- ptid_t pid_ptid = pid_to_ptid (ptid_get_pid (current_lwp_ptid ()));
+ ptid_t pid_ptid = ptid_t (current_lwp_ptid ().pid ());
- iterate_over_lwps (pid_ptid, s390_refresh_per_info_cb, NULL);
+ iterate_over_lwps (pid_ptid, s390_refresh_per_info_cb);
return 0;
}
-static int
-s390_insert_watchpoint (struct target_ops *self,
- CORE_ADDR addr, int len, enum target_hw_bp_type type,
- struct expression *cond)
+int
+s390_linux_nat_target::insert_watchpoint (CORE_ADDR addr, int len,
+ enum target_hw_bp_type type,
+ struct expression *cond)
{
- s390_watch_area area;
+ watch_area area;
struct s390_debug_reg_state *state
- = s390_get_debug_reg_state (ptid_get_pid (inferior_ptid));
+ = s390_get_debug_reg_state (inferior_ptid.pid ());
area.lo_addr = addr;
area.hi_addr = addr + len - 1;
- VEC_safe_push (s390_watch_area, state->watch_areas, &area);
+ state->watch_areas.push_back (area);
return s390_refresh_per_info ();
}
-static int
-s390_remove_watchpoint (struct target_ops *self,
- CORE_ADDR addr, int len, enum target_hw_bp_type type,
- struct expression *cond)
+int
+s390_linux_nat_target::remove_watchpoint (CORE_ADDR addr, int len,
+ enum target_hw_bp_type type,
+ struct expression *cond)
{
unsigned ix;
- s390_watch_area *area;
struct s390_debug_reg_state *state
- = s390_get_debug_reg_state (ptid_get_pid (inferior_ptid));
+ = s390_get_debug_reg_state (inferior_ptid.pid ());
- for (ix = 0;
- VEC_iterate (s390_watch_area, state->watch_areas, ix, area);
- ix++)
+ for (ix = 0; ix < state->watch_areas.size (); ix++)
{
- if (area->lo_addr == addr && area->hi_addr == addr + len - 1)
+ watch_area &area = state->watch_areas[ix];
+ if (area.lo_addr == addr && area.hi_addr == addr + len - 1)
{
- VEC_unordered_remove (s390_watch_area, state->watch_areas, ix);
+ unordered_remove (state->watch_areas, ix);
return s390_refresh_per_info ();
}
}
- fprintf_unfiltered (gdb_stderr,
- "Attempt to remove nonexistent watchpoint.\n");
+ gdb_printf (gdb_stderr,
+ "Attempt to remove nonexistent watchpoint.\n");
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)
+int
+s390_linux_nat_target::can_use_hw_breakpoint (enum bptype type,
+ int cnt, int othertype)
{
if (type == bp_hardware_watchpoint || type == bp_hardware_breakpoint)
return 1;
/* 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)
+int
+s390_linux_nat_target::insert_hw_breakpoint (struct gdbarch *gdbarch,
+ struct bp_target_info *bp_tgt)
{
- s390_watch_area area;
+ 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);
+ state = s390_get_debug_reg_state (inferior_ptid.pid ());
+ state->break_areas.push_back (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)
+int
+s390_linux_nat_target::remove_hw_breakpoint (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++)
+ state = s390_get_debug_reg_state (inferior_ptid.pid ());
+ for (ix = 0; state->break_areas.size (); ix++)
{
- if (area->lo_addr == bp_tgt->placed_address)
+ watch_area &area = state->break_areas[ix];
+ if (area.lo_addr == bp_tgt->placed_address)
{
- VEC_unordered_remove (s390_watch_area, state->break_areas, ix);
+ unordered_remove (state->break_areas, ix);
return s390_refresh_per_info ();
}
}
- fprintf_unfiltered (gdb_stderr,
- "Attempt to remove nonexistent breakpoint.\n");
+ gdb_printf (gdb_stderr,
+ "Attempt to remove nonexistent breakpoint.\n");
return -1;
}
-static int
-s390_region_ok_for_hw_watchpoint (struct target_ops *self,
- CORE_ADDR addr, int cnt)
+int
+s390_linux_nat_target::region_ok_for_hw_watchpoint (CORE_ADDR addr, int cnt)
{
return 1;
}
/* Check for 64-bit inferior process. This is the case when the host is
64-bit, and in addition bit 32 of the PSW mask is set. */
#ifdef __s390x__
+ int tid = s390_inferior_tid ();
+ gdb_assert (tid != 0);
long pswm;
errno = 0;
- pswm = (long) ptrace (PTRACE_PEEKUSER, s390_inferior_tid (), PT_PSWMASK, 0);
+ pswm = (long) ptrace (PTRACE_PEEKUSER, tid, PT_PSWMASK, 0);
if (errno == 0 && (pswm & 0x100000000ul) != 0)
wordsize = 8;
#endif
return wordsize;
}
-static int
-s390_auxv_parse (struct target_ops *ops, gdb_byte **readptr,
- gdb_byte *endptr, CORE_ADDR *typep, CORE_ADDR *valp)
+int
+s390_linux_nat_target::auxv_parse (const gdb_byte **readptr,
+ const gdb_byte *endptr, CORE_ADDR *typep,
+ CORE_ADDR *valp)
{
+ gdb_assert (inferior_ptid != null_ptid);
int sizeof_auxv_field = s390_target_wordsize ();
- enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ());
- gdb_byte *ptr = *readptr;
+ bfd_endian byte_order = gdbarch_byte_order (current_inferior ()->arch ());
+ const gdb_byte *ptr = *readptr;
if (endptr == ptr)
return 0;
return 1;
}
-static const struct target_desc *
-s390_read_description (struct target_ops *ops)
+const struct target_desc *
+s390_linux_nat_target::read_description ()
{
- int tid = s390_inferior_tid ();
+ if (inferior_ptid == null_ptid)
+ return this->beneath ()->read_description ();
+
+ int tid = inferior_ptid.pid ();
have_regset_last_break
= check_regset (tid, NT_S390_LAST_BREAK, 8);
that mode, report s390 architecture with 64-bit GPRs. */
#ifdef __s390x__
{
- CORE_ADDR hwcap = 0;
+ CORE_ADDR hwcap = linux_get_hwcap ();
- target_auxv_search (¤t_target, AT_HWCAP, &hwcap);
have_regset_tdb = (hwcap & HWCAP_S390_TE)
&& check_regset (tid, NT_S390_TDB, s390_sizeof_tdbregset);
tdesc_s390_linux32);
}
+void _initialize_s390_nat ();
void
-_initialize_s390_nat (void)
+_initialize_s390_nat ()
{
- struct target_ops *t;
-
- /* Fill in the generic GNU/Linux methods. */
- t = linux_target ();
-
- /* Add our register access methods. */
- t->to_fetch_registers = s390_linux_fetch_inferior_registers;
- t->to_store_registers = s390_linux_store_inferior_registers;
-
- /* 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;
- t->to_insert_watchpoint = s390_insert_watchpoint;
- t->to_remove_watchpoint = s390_remove_watchpoint;
-
- /* Detect target architecture. */
- t->to_read_description = s390_read_description;
- t->to_auxv_parse = s390_auxv_parse;
-
/* Register the target. */
- linux_nat_add_target (t);
- linux_nat_set_new_thread (t, s390_new_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);
+ linux_target = &the_s390_linux_nat_target;
+ add_inf_child_target (&the_s390_linux_nat_target);
/* A maintenance command to enable showing the PER state. */
add_setshow_boolean_cmd ("show-debug-regs", class_maintenance,
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