Between switch_begin and switch_complete or cancel_complete, the
affected thread's LWP pointer is not reliable. It is possible that
other parts of the thread's thread_map are also unreliable during
- that time. */
+ that time. */
#include "defs.h"
#include <fcntl.h>
/* <thread.h> includes <sys/priocntl.h>, which requires boolean_t from
- <sys/types.h>, which doesn't typedef boolean_t with gcc. */
+ <sys/types.h>, which doesn't typedef boolean_t with gcc. */
#define boolean_t int
#include <thread.h>
#include <synch.h> /* for UnixWare 2.x */
-/* Prototypes for supply_gregset etc. */
+/* Prototypes for supply_gregset etc. */
#include "gregset.h"
/* Offset from SP to first arg on stack at first instruction of a
#define SP_ARG0 (1 * 4)
#endif
-/* Whether to emit debugging output. */
+/* Whether to emit debugging output. */
#define DEBUG 0
-/* Default debugging output file, overridden by envvar UWTHR_DEBUG. */
+/* Default debugging output file, overridden by envvar UWTHR_DEBUG. */
#define DEBUG_FILE "/dev/tty"
-/* #if DEBUG, write string S to the debugging output channel. */
+/* #if DEBUG, write string S to the debugging output channel. */
#if !DEBUG
# define DBG(fmt_and_args)
#endif
/* Back end to CALL_BASE() and TRY_BASE(): evaluate CALL, then convert
- inferior_ptid to a composite thread/process id. */
+ inferior_ptid to a composite thread/process id. */
#define CALL_BASE_1(call) \
do { \
evaluate base_ops function CALL, and then convert inferior_ptid back to a
composite thread/process id.
- Otherwise, issue an error message and return nonlocally. */
+ Otherwise, issue an error message and return nonlocally. */
#define CALL_BASE(call) \
do { \
} while (0)
/* Like CALL_BASE(), but instead of returning nonlocally on error, set
- *CALLED to whether the inferior_ptid conversion was successful. */
+ *CALLED to whether the inferior_ptid conversion was successful. */
#define TRY_BASE(call, called) \
do { \
CALL_BASE_1 (call); \
} while (0)
-/* Information passed by thread_iter() to its callback parameter. */
+/* Information passed by thread_iter() to its callback parameter. */
typedef struct {
struct thread_map map;
CORE_ADDR mapp;
} iter_t;
-/* Private thread data for the thread_info struct. */
+/* Private thread data for the thread_info struct. */
struct private_thread_info {
int stable; /* 0 if libthread.so is modifying thread map */
};
-/* procfs.c's target-specific operations. */
+/* procfs.c's target-specific operations. */
extern struct target_ops procfs_ops;
-/* Flag to prevent procfs.c from starting inferior processes. */
+/* Flag to prevent procfs.c from starting inferior processes. */
extern int procfs_suppress_run;
-/* This module's target-specific operations. */
+/* This module's target-specific operations. */
static struct target_ops uw_thread_ops;
/* Copy of the target over which uw_thread_ops is pushed. This is
more convenient than a pointer to procfs_ops or core_ops, because
- they lack current_target's default callbacks. */
+ they lack current_target's default callbacks. */
static struct target_ops base_ops;
/* Saved pointer to previous owner of
Except for module one-time intialization and where otherwise
documented, no functions in this module get called when
- !uw_thread_active. */
+ !uw_thread_active. */
static int uw_thread_active;
/* For efficiency, cache the addresses of libthread.so's _thr_debug
- structure, its thr_brk stub function, and the main thread's map. */
+ structure, its thr_brk stub function, and the main thread's map. */
static CORE_ADDR thr_debug_addr;
static CORE_ADDR thr_brk_addr;
static CORE_ADDR thr_map_main;
/* Remember the thread most recently marked as switching. Necessary because
- libthread.so passes null map when calling stub with tc_*_complete. */
+ libthread.so passes null map when calling stub with tc_*_complete. */
static struct thread_info *switchto_thread;
-/* Cleanup chain for safely restoring inferior_ptid after CALL_BASE. */
+/* Cleanup chain for safely restoring inferior_ptid after CALL_BASE. */
static struct cleanup *infpid_cleanup;
#if DEBUG
/* Helper function for DBG() macro: if printf-style FMT is non-null, format it
- with args and display the result on the debugging output channel. */
+ with args and display the result on the debugging output channel. */
static void
dbg (char *fmt, ...)
}
#if 0
-/* Return a string representing composite PID's components. */
+/* Return a string representing composite PID's components. */
static char *
dbgpid (ptid_t ptid)
return buf;
}
-/* Return a string representing thread state CHANGE. */
+/* Return a string representing thread state CHANGE. */
static char *
dbgchange (enum thread_change change)
}
}
-/* Return a string representing thread STATE. */
+/* Return a string representing thread STATE. */
static char *
dbgstate (int state)
#endif /* DEBUG */
-/* Read the contents of _thr_debug into *DEBUGP. Return success. */
+/* Read the contents of _thr_debug into *DEBUGP. Return success. */
static int
read_thr_debug (struct thread_debug *debugp)
}
/* Read into MAP the contents of the thread map at inferior process address
- MAPP. Return success. */
+ MAPP. Return success. */
static int
read_map (CORE_ADDR mapp, struct thread_map *map)
}
/* Read into LWP the contents of the lwp decriptor at inferior process address
- LWPP. Return success. */
+ LWPP. Return success. */
static int
read_lwp (CORE_ADDR lwpp, __lwp_desc_t *lwp)
where <map> is the thread's struct thread_map and <lwp> if non-null is the
thread's current __lwp_desc_t.
- If a call to FUNC returns nonzero, return that value; otherwise, return 0. */
+ If a call to FUNC returns nonzero, return that value; otherwise, return 0. */
static int
thread_iter (int (*func)(iter_t *, void *), void *data)
}
}
-/* Deactivate user-mode thread support. */
+/* Deactivate user-mode thread support. */
static void
deactivate_uw_thread (void)
}
/* Return the composite lwp/process id corresponding to composite
- id PID. If PID is a thread with no lwp, return 0. */
+ id PID. If PID is a thread with no lwp, return 0. */
static ptid_t
thr_to_lwp (ptid_t ptid)
}
/* find_thread_lwp() callback: return whether TP describes a thread
- associated with lwp id DATA. */
+ associated with lwp id DATA. */
static int
find_thread_lwp_callback (struct thread_info *tp, void *data)
}
/* If a thread is associated with lwp id LWPID, return the corresponding
- member of the global thread list; otherwise, return null. */
+ member of the global thread list; otherwise, return null. */
static struct thread_info *
find_thread_lwp (int lwpid)
}
/* Return the composite thread/process id corresponding to composite
- id PID. If PID is an lwp with no thread, return PID. */
+ id PID. If PID is an lwp with no thread, return PID. */
static ptid_t
lwp_to_thr (ptid_t ptid)
}
/* do_cleanups() callback: convert inferior_ptid to a composite
- thread/process id after having made a procfs call. */
+ thread/process id after having made a procfs call. */
static void
thr_infpid (void *unused)
}
/* If possible, convert inferior_ptid to a composite lwp/process id in
- preparation for making a procfs call. Return success. */
+ preparation for making a procfs call. Return success. */
static int
lwp_infpid (void)
}
/* Add to the global thread list a new user-mode thread with system id THRID,
- lwp id LWPID, map address MAPP, and composite thread/process PID. */
+ lwp id LWPID, map address MAPP, and composite thread/process PID. */
static void
add_thread_uw (int thrid, int lwpid, CORE_ADDR mapp, ptid_t ptid)
/* notice_threads() and find_main() callback: if the thread list doesn't
already contain the thread described by ITER, add it if it's the main
- thread or if !DATA. */
+ thread or if !DATA. */
static int
notice_thread (iter_t *iter, void *data)
return 0;
}
-/* Add to the thread list any threads it doesn't already contain. */
+/* Add to the thread list any threads it doesn't already contain. */
static void
notice_threads (void)
thread_iter (notice_thread, NULL);
}
-/* Return the address of the main thread's map. On error, return 0. */
+/* Return the address of the main thread's map. On error, return 0. */
static CORE_ADDR
find_main (void)
/* Attach to process specified by ARGS, then initialize for debugging it
and wait for the trace-trap that results from attaching.
- This function only gets called with uw_thread_active == 0. */
+ This function only gets called with uw_thread_active == 0. */
static void
uw_thread_attach (char *args, int from_tty)
thr_infpid (NULL);
}
-/* Detach from the process attached to by uw_thread_attach(). */
+/* Detach from the process attached to by uw_thread_attach(). */
static void
uw_thread_detach (char *args, int from_tty)
}
/* Tell the inferior process to continue running thread PID if >= 0
- and all threads otherwise. */
+ and all threads otherwise. */
static void
uw_thread_resume (ptid_t ptid, int step, enum target_signal signo)
/* If the trap we just received from lwp PID was due to a breakpoint
on the libthread.so debugging stub, update this module's state
- accordingly. */
+ accordingly. */
static void
libthread_stub (ptid_t ptid)
ptid_t tid = null_ptid;
struct thread_info *info;
- /* Check for stub breakpoint. */
+ /* Check for stub breakpoint. */
if (read_pc_pid (ptid) - DECR_PC_AFTER_BREAK != thr_brk_addr)
return;
- /* Retrieve stub args. */
+ /* Retrieve stub args. */
sp = read_register_pid (SP_REGNUM, ptid);
if (!base_ops.deprecated_xfer_memory (sp + SP_ARG0, (char *)&mapp,
sizeof (mapp), 0, NULL, &base_ops))
goto err;
/* create_inferior() may not have finished yet, so notice the main
- thread to ensure that it's displayed first by add_thread(). */
+ thread to ensure that it's displayed first by add_thread(). */
mapp_main = find_main ();
- /* Notice thread creation, deletion, or stability change. */
+ /* Notice thread creation, deletion, or stability change. */
switch (change) {
case tc_switch_begin:
if (!mapp) /* usually means main thread */
(b) it may have been a spurious switch following a tc_thread_exit.
Therefore, explicitly query the thread's lwp before caching it in
- its thread list entry. */
+ its thread list entry. */
if (!read_map (switchto_thread->private->mapp, &map))
goto err;
dbgchange (change), tid ? dbgstate (map.thr_state) : ""));
}
-/* Wait for thread/lwp/process ID if >= 0 or for any thread otherwise. */
+/* Wait for thread/lwp/process ID if >= 0 or for any thread otherwise. */
static ptid_t
uw_thread_wait (ptid_t ptid, struct target_waitstatus *status)
}
/* Tell gdb about the registers in the thread/lwp/process specified by
- inferior_ptid. */
+ inferior_ptid. */
static void
uw_thread_fetch_registers (int regno)
}
/* Store gdb's current view of the register set into the thread/lwp/process
- specified by inferior_ptid. */
+ specified by inferior_ptid. */
static void
uw_thread_store_registers (int regno)
CALL_BASE (base_ops.to_store_registers (regno));
}
-/* Prepare to modify the registers array. */
+/* Prepare to modify the registers array. */
static void
uw_thread_prepare_to_store (void)
/* Fork an inferior process and start debugging it.
- This function only gets called with uw_thread_active == 0. */
+ This function only gets called with uw_thread_active == 0. */
static void
uw_thread_create_inferior (char *exec_file, char *allargs, char **env,
}
}
-/* Kill and forget about the inferior process. */
+/* Kill and forget about the inferior process. */
static void
uw_thread_kill (void)
base_ops.to_kill ();
}
-/* Clean up after the inferior exits. */
+/* Clean up after the inferior exits. */
static void
uw_thread_mourn_inferior (void)
/* Return whether this module can attach to and run processes.
- This function only gets called with uw_thread_active == 0. */
+ This function only gets called with uw_thread_active == 0. */
static int
uw_thread_can_run (void)
return procfs_suppress_run;
}
-/* Return whether thread PID is still valid. */
+/* Return whether thread PID is still valid. */
static int
uw_thread_alive (ptid_t ptid)
return base_ops.to_thread_alive (ptid);
/* If it's in the thread list, it's valid, because otherwise
- libthread_stub() would have deleted it. */
+ libthread_stub() would have deleted it. */
return in_thread_list (ptid);
}
-/* Add to the thread list any threads and lwps it doesn't already contain. */
+/* Add to the thread list any threads and lwps it doesn't already contain. */
static void
uw_thread_find_new_threads (void)
}
/* Return a string for pretty-printing PID in "info threads" output.
- This may be called by either procfs.c or by generic gdb. */
+ This may be called by either procfs.c or by generic gdb. */
static char *
uw_thread_pid_to_str (ptid_t ptid)
static char buf[sizeof (FMT) + 3 * sizeof (long)];
if (!ISTID (ptid))
- /* core_ops says "process foo", so call procfs_ops explicitly. */
+ /* core_ops says "process foo", so call procfs_ops explicitly. */
return procfs_ops.to_pid_to_str (ptid);
sprintf (buf, FMT, TIDGET (ptid));
}
/* Return a string displaying INFO state information in "info threads"
- output. */
+ output. */
static char *
uw_extra_thread_info (struct thread_info *info)
libthread.so loading happens while (a) an inferior process is being
started by procfs and (b) a core image is being loaded.
- This function often gets called with uw_thread_active == 0. */
+ This function often gets called with uw_thread_active == 0. */
static void
libthread_init (void)
struct breakpoint *b;
int one = 1;
- /* Don't initialize twice. */
+ /* Don't initialize twice. */
if (uw_thread_active)
return;
- /* Check whether libthread.so has been loaded. */
+ /* Check whether libthread.so has been loaded. */
if (!(ms = lookup_minimal_symbol ("_thr_debug", NULL, NULL)))
return;
- /* Cache _thr_debug's address. */
+ /* Cache _thr_debug's address. */
if (!(thr_debug_addr = SYMBOL_VALUE_ADDRESS (ms)))
return;
/* Initialize base_ops.deprecated_xfer_memory(). */
base_ops = current_target;
- /* Load _thr_debug's current contents. */
+ /* Load _thr_debug's current contents. */
if (!read_thr_debug (&debug))
return;
/* User code (e.g. my test programs) may dereference _thr_debug,
- making it availble to GDB before shared libs are loaded. */
+ making it availble to GDB before shared libs are loaded. */
if (!debug.thr_map)
return;
/* libthread.so has been loaded, and the current_target should now
- reflect core_ops or procfs_ops. */
+ reflect core_ops or procfs_ops. */
push_target (&uw_thread_ops); /* must precede notice_threads() */
uw_thread_active = 1;
if (!target_has_execution)
- /* Locate threads in core file. */
+ /* Locate threads in core file. */
notice_threads ();
else
{
- /* Set a breakpoint on the stub function provided by libthread.so. */
+ /* Set a breakpoint on the stub function provided by libthread.so. */
thr_brk_addr = (CORE_ADDR)debug.thr_brk;
if (!(b = create_thread_event_breakpoint (thr_brk_addr)))
goto err;
- /* Activate the stub function. */
+ /* Activate the stub function. */
onp = (CORE_ADDR)&((struct thread_debug *)thr_debug_addr)->thr_debug_on;
if (!base_ops.deprecated_xfer_memory ((CORE_ADDR)onp, (char *)&one,
sizeof (one), 1, NULL, &base_ops))
goto err;
}
- /* Prepare for finding the main thread, which doesn't yet exist. */
+ /* Prepare for finding the main thread, which doesn't yet exist. */
thr_map_main = 0;
}
If OBJFILE is null, libthread.so has gone away, so stop debugging
user-mode threads.
- This function often gets called with uw_thread_active == 0. */
+ This function often gets called with uw_thread_active == 0. */
static void
uw_thread_new_objfile (struct objfile *objfile)
target_new_objfile_chain (objfile);
}
-/* Initialize uw_thread_ops. */
+/* Initialize uw_thread_ops. */
static void
init_uw_thread_ops (void)
}
/* Module startup initialization function, automagically called by
- init.c. */
+ init.c. */
void
_initialize_uw_thread (void)
procfs_suppress_run = 1;
- /* Notice when libthread.so gets loaded. */
+ /* Notice when libthread.so gets loaded. */
target_new_objfile_chain = deprecated_target_new_objfile_hook;
deprecated_target_new_objfile_hook = uw_thread_new_objfile;
}
projects / binutils-gdb.git / commitdiff