/* Internal interfaces for the GNU/Linux specific target code for gdbserver.
- Copyright (C) 2002, 2004, 2005, 2007, 2008, 2009
- Free Software Foundation, Inc.
+ Copyright (C) 2002-2014 Free Software Foundation, Inc.
This file is part of GDB.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
-#ifdef HAVE_THREAD_DB_H
-#include <thread_db.h>
-#endif
+#include "nat/gdb_thread_db.h"
+#include <signal.h>
+
+#include "gdbthread.h"
+#include "gdb_proc_service.h"
+
+/* Included for ptrace type definitions. */
+#include "nat/linux-ptrace.h"
+
+#define PTRACE_XFER_TYPE long
#ifdef HAVE_LINUX_REGSETS
-typedef void (*regset_fill_func) (void *);
-typedef void (*regset_store_func) (const void *);
+typedef void (*regset_fill_func) (struct regcache *, void *);
+typedef void (*regset_store_func) (struct regcache *, const void *);
enum regset_type {
GENERAL_REGS,
FP_REGS,
struct regset_info
{
int get_request, set_request;
+ /* If NT_TYPE isn't 0, it will be passed to ptrace as the 3rd
+ argument and the 4th argument should be "const struct iovec *". */
+ int nt_type;
int size;
enum regset_type type;
regset_fill_func fill_function;
regset_store_func store_function;
};
-extern struct regset_info target_regsets[];
+
+/* Aggregation of all the supported regsets of a given
+ architecture/mode. */
+
+struct regsets_info
+{
+ /* The regsets array. */
+ struct regset_info *regsets;
+
+ /* The number of regsets in the REGSETS array. */
+ int num_regsets;
+
+ /* If we get EIO on a regset, do not try it again. Note the set of
+ supported regsets may depend on processor mode on biarch
+ machines. This is a (lazily allocated) array holding one boolean
+ byte (0/1) per regset, with each element corresponding to the
+ regset in the REGSETS array above at the same offset. */
+ char *disabled_regsets;
+};
+
+#endif
+
+/* Mapping between the general-purpose registers in `struct user'
+ format and GDB's register array layout. */
+
+struct usrregs_info
+{
+ /* The number of registers accessible. */
+ int num_regs;
+
+ /* The registers map. */
+ int *regmap;
+};
+
+/* All info needed to access an architecture/mode's registers. */
+
+struct regs_info
+{
+ /* Regset support bitmap: 1 for registers that are transferred as a part
+ of a regset, 0 for ones that need to be handled individually. This
+ can be NULL if all registers are transferred with regsets or regsets
+ are not supported. */
+ unsigned char *regset_bitmap;
+
+ /* Info used when accessing registers with PTRACE_PEEKUSER /
+ PTRACE_POKEUSER. This can be NULL if all registers are
+ transferred with regsets .*/
+ struct usrregs_info *usrregs;
+
+#ifdef HAVE_LINUX_REGSETS
+ /* Info used when accessing registers with regsets. */
+ struct regsets_info *regsets_info;
#endif
+};
+
+struct process_info_private
+{
+ /* Arch-specific additions. */
+ struct arch_process_info *arch_private;
+
+ /* libthread_db-specific additions. Not NULL if this process has loaded
+ thread_db, and it is active. */
+ struct thread_db *thread_db;
+
+ /* &_r_debug. 0 if not yet determined. -1 if no PT_DYNAMIC in Phdrs. */
+ CORE_ADDR r_debug;
+
+ /* This flag is true iff we've just created or attached to the first
+ LWP of this process but it has not stopped yet. As soon as it
+ does, we need to call the low target's arch_setup callback. */
+ int new_inferior;
+};
+
+struct lwp_info;
struct linux_target_ops
{
/* Architecture-specific setup. */
void (*arch_setup) (void);
- int num_regs;
- int *regmap;
+ const struct regs_info *(*regs_info) (void);
int (*cannot_fetch_register) (int);
/* Returns 0 if we can store the register, 1 if we can not
store the register, and 2 if failure to store the register
is acceptable. */
int (*cannot_store_register) (int);
- CORE_ADDR (*get_pc) (void);
- void (*set_pc) (CORE_ADDR newpc);
+
+ /* Hook to fetch a register in some non-standard way. Used for
+ example by backends that have read-only registers with hardcoded
+ values (e.g., IA64's gr0/fr0/fr1). Returns true if register
+ REGNO was supplied, false if not, and we should fallback to the
+ standard ptrace methods. */
+ int (*fetch_register) (struct regcache *regcache, int regno);
+
+ CORE_ADDR (*get_pc) (struct regcache *regcache);
+ void (*set_pc) (struct regcache *regcache, CORE_ADDR newpc);
const unsigned char *breakpoint;
int breakpoint_len;
CORE_ADDR (*breakpoint_reinsert_addr) (void);
-
int decr_pc_after_break;
int (*breakpoint_at) (CORE_ADDR pc);
- /* Watchpoint related functions. See target.h for comments. */
- int (*insert_watchpoint) (char type, CORE_ADDR addr, int len);
- int (*remove_watchpoint) (char type, CORE_ADDR addr, int len);
+ /* Breakpoint and watchpoint related functions. See target.h for
+ comments. */
+ int (*supports_z_point_type) (char z_type);
+ int (*insert_point) (enum raw_bkpt_type type, CORE_ADDR addr,
+ int size, struct raw_breakpoint *bp);
+ int (*remove_point) (enum raw_bkpt_type type, CORE_ADDR addr,
+ int size, struct raw_breakpoint *bp);
+
int (*stopped_by_watchpoint) (void);
CORE_ADDR (*stopped_data_address) (void);
/* Hooks to reformat register data for PEEKUSR/POKEUSR (in particular
for registers smaller than an xfer unit). */
- void (*collect_ptrace_register) (int regno, char *buf);
- void (*supply_ptrace_register) (int regno, const char *buf);
+ void (*collect_ptrace_register) (struct regcache *regcache,
+ int regno, char *buf);
+ void (*supply_ptrace_register) (struct regcache *regcache,
+ int regno, const char *buf);
+
+ /* Hook to convert from target format to ptrace format and back.
+ Returns true if any conversion was done; false otherwise.
+ If DIRECTION is 1, then copy from INF to NATIVE.
+ If DIRECTION is 0, copy from NATIVE to INF. */
+ int (*siginfo_fixup) (siginfo_t *native, void *inf, int direction);
+
+ /* Hook to call when a new process is created or attached to.
+ If extra per-process architecture-specific data is needed,
+ allocate it here. */
+ struct arch_process_info * (*new_process) (void);
+
+ /* Hook to call when a new thread is detected.
+ If extra per-thread architecture-specific data is needed,
+ allocate it here. */
+ struct arch_lwp_info * (*new_thread) (void);
+
+ /* Hook to call prior to resuming a thread. */
+ void (*prepare_to_resume) (struct lwp_info *);
+
+ /* Hook to support target specific qSupported. */
+ void (*process_qsupported) (const char *);
+
+ /* Returns true if the low target supports tracepoints. */
+ int (*supports_tracepoints) (void);
+
+ /* Fill ADDRP with the thread area address of LWPID. Returns 0 on
+ success, -1 on failure. */
+ int (*get_thread_area) (int lwpid, CORE_ADDR *addrp);
+
+ /* Install a fast tracepoint jump pad. See target.h for
+ comments. */
+ int (*install_fast_tracepoint_jump_pad) (CORE_ADDR tpoint, CORE_ADDR tpaddr,
+ CORE_ADDR collector,
+ CORE_ADDR lockaddr,
+ ULONGEST orig_size,
+ CORE_ADDR *jump_entry,
+ CORE_ADDR *trampoline,
+ ULONGEST *trampoline_size,
+ unsigned char *jjump_pad_insn,
+ ULONGEST *jjump_pad_insn_size,
+ CORE_ADDR *adjusted_insn_addr,
+ CORE_ADDR *adjusted_insn_addr_end,
+ char *err);
+
+ /* Return the bytecode operations vector for the current inferior.
+ Returns NULL if bytecode compilation is not supported. */
+ struct emit_ops *(*emit_ops) (void);
+
+ /* Return the minimum length of an instruction that can be safely overwritten
+ for use as a fast tracepoint. */
+ int (*get_min_fast_tracepoint_insn_len) (void);
+
+ /* Returns true if the low target supports range stepping. */
+ int (*supports_range_stepping) (void);
};
extern struct linux_target_ops the_low_target;
-#define pid_of(proc) ((proc)->head.id)
-#define lwpid_of(proc) ((proc)->head.id)
+#define get_thread_lwp(thr) ((struct lwp_info *) (inferior_target_data (thr)))
+#define get_lwp_thread(lwp) ((lwp)->thread)
+
+/* This struct is recorded in the target_data field of struct thread_info.
+
+ On linux ``all_threads'' is keyed by the LWP ID, which we use as the
+ GDB protocol representation of the thread ID. Threads also have
+ a "process ID" (poorly named) which is (presently) the same as the
+ LWP ID.
-#define get_lwp(inf) ((struct lwp_info *)(inf))
-#define get_thread_lwp(thr) (get_lwp (inferior_target_data (thr)))
-#define get_lwp_thread(proc) ((struct thread_info *) \
- find_inferior_id (&all_threads, \
- lwpid_of (get_lwp (proc))))
+ There is also ``all_processes'' is keyed by the "overall process ID",
+ which GNU/Linux calls tgid, "thread group ID". */
struct lwp_info
{
- struct inferior_list_entry head;
+ /* Backlink to the parent object. */
+ struct thread_info *thread;
/* If this flag is set, the next SIGSTOP will be ignored (the
process will be immediately resumed). This means that either we
yet. */
int stop_expected;
- /* True if this thread was suspended (with vCont;t). */
+ /* When this is true, we shall not try to resume this thread, even
+ if last_resume_kind isn't resume_stop. */
int suspended;
/* If this flag is set, the lwp is known to be stopped right now (stop
event already received in a wait()). */
int stopped;
+ /* If this flag is set, the lwp is known to be dead already (exit
+ event already received in a wait(), and is cached in
+ status_pending). */
+ int dead;
+
/* When stopped is set, the last wait status recorded for this lwp. */
int last_status;
+ /* When stopped is set, this is where the lwp stopped, with
+ decr_pc_after_break already accounted for. */
+ CORE_ADDR stop_pc;
+
/* If this flag is set, STATUS_PENDING is a waitstatus that has not yet
been reported. */
int status_pending_p;
int status_pending;
- /* If this flag is set, the pending status is a (GDB-placed) breakpoint. */
- int pending_is_breakpoint;
- CORE_ADDR pending_stop_pc;
+ /* STOPPED_BY_WATCHPOINT is non-zero if this LWP stopped with a data
+ watchpoint trap. */
+ int stopped_by_watchpoint;
+
+ /* On architectures where it is possible to know the data address of
+ a triggered watchpoint, STOPPED_DATA_ADDRESS is non-zero, and
+ contains such data address. Only valid if STOPPED_BY_WATCHPOINT
+ is true. */
+ CORE_ADDR stopped_data_address;
/* If this is non-zero, it is a breakpoint to be reinserted at our next
stop (SIGTRAP stops only). */
CORE_ADDR bp_reinsert;
- /* If this flag is set, the last continue operation on this process
- was a single-step. */
+ /* If this flag is set, the last continue operation at the ptrace
+ level on this process was a single-step. */
int stepping;
+ /* Range to single step within. This is a copy of the step range
+ passed along the last resume request. See 'struct
+ thread_resume'. */
+ CORE_ADDR step_range_start; /* Inclusive */
+ CORE_ADDR step_range_end; /* Exclusive */
+
+ /* If this flag is set, we need to set the event request flags the
+ next time we see this LWP stop. */
+ int must_set_ptrace_flags;
+
/* If this is non-zero, it points to a chain of signals which need to
be delivered to this process. */
struct pending_signals *pending_signals;
/* A link used when resuming. It is initialized from the resume request,
and then processed and cleared in linux_resume_one_lwp. */
-
struct thread_resume *resume;
+ /* True if it is known that this lwp is presently collecting a fast
+ tracepoint (it is in the jump pad or in some code that will
+ return to the jump pad. Normally, we won't care about this, but
+ we will if a signal arrives to this lwp while it is
+ collecting. */
+ int collecting_fast_tracepoint;
+
+ /* If this is non-zero, it points to a chain of signals which need
+ to be reported to GDB. These were deferred because the thread
+ was doing a fast tracepoint collect when they arrived. */
+ struct pending_signals *pending_signals_to_report;
+
+ /* When collecting_fast_tracepoint is first found to be 1, we insert
+ a exit-jump-pad-quickly breakpoint. This is it. */
+ struct breakpoint *exit_jump_pad_bkpt;
+
+ /* True if the LWP was seen stop at an internal breakpoint and needs
+ stepping over later when it is resumed. */
+ int need_step_over;
+
+#ifdef USE_THREAD_DB
int thread_known;
-#ifdef HAVE_THREAD_DB_H
/* The thread handle, used for e.g. TLS access. Only valid if
THREAD_KNOWN is set. */
td_thrhandle_t th;
#endif
+
+ /* Arch-specific additions. */
+ struct arch_lwp_info *arch_private;
};
-extern struct inferior_list all_lwps;
+int linux_pid_exe_is_elf_64_file (int pid, unsigned int *machine);
+
+/* Attach to PTID. Returns 0 on success, non-zero otherwise (an
+ errno). */
+int linux_attach_lwp (ptid_t ptid);
+
+/* Return the reason an attach failed, in string form. ERR is the
+ error returned by linux_attach_lwp (an errno). This string should
+ be copied into a buffer by the client if the string will not be
+ immediately used, or if it must persist. */
+char *linux_attach_fail_reason_string (ptid_t ptid, int err);
+
+struct lwp_info *find_lwp_pid (ptid_t ptid);
+void linux_stop_lwp (struct lwp_info *lwp);
+
+#ifdef HAVE_LINUX_REGSETS
+void initialize_regsets_info (struct regsets_info *regsets_info);
+#endif
-void linux_attach_lwp (unsigned long pid);
+void initialize_low_arch (void);
+/* From thread-db.c */
int thread_db_init (int use_events);
+void thread_db_detach (struct process_info *);
+void thread_db_mourn (struct process_info *);
+int thread_db_handle_monitor_command (char *);
int thread_db_get_tls_address (struct thread_info *thread, CORE_ADDR offset,
CORE_ADDR load_module, CORE_ADDR *address);
+int thread_db_look_up_one_symbol (const char *name, CORE_ADDR *addrp);
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