* sol-thread.c: More cleanup, add comments.
* (sol_thread_resume): Prevent people from trying to step inactive threads. * (sol_thread_wait sol_thread_fetch_registers sol_thread_store_registers): Remove unnecessary check for sol_thread_active. These routines won't get called unless threads are active.
This commit is contained in:
Stu Grossman
parent
05535e79e9
commit
a50cedad0e
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@ -1,3 +1,13 @@
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Mon May 13 16:17:36 1996 Stu Grossman (grossman@critters.cygnus.com)
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* sol-thread.c: More cleanup, add comments.
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* (sol_thread_resume): Prevent people from trying to step
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inactive threads.
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* (sol_thread_wait sol_thread_fetch_registers
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sol_thread_store_registers): Remove unnecessary check for
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sol_thread_active. These routines won't get called unless threads
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are active.
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Mon May 13 11:29:37 1996 Stan Shebs <shebs@andros.cygnus.com>
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SH3-E support from Allan Tajii <atajii@hmsi.com>:
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168
gdb/sol-thread.c
168
gdb/sol-thread.c
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@ -17,6 +17,34 @@ You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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/* This module implements a sort of half target that sits between the
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machine-independent parts of GDB and the /proc interface (procfs.c) to
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provide access to the Solaris user-mode thread implementation.
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Solaris threads are true user-mode threads, which are invoked via the thr_*
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and pthread_* (native and Posix respectivly) interfaces. These are mostly
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implemented in user-space, with all thread context kept in various
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structures that live in the user's heap. These should not be confused with
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lightweight processes (LWPs), which are implemented by the kernel, and
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scheduled without explicit intervention by the process.
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Just to confuse things a little, Solaris threads (both native and Posix) are
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actually implemented using LWPs. In general, there are going to be more
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threads than LWPs. There is no fixed correspondence between a thread and an
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LWP. When a thread wants to run, it gets scheduled onto the first available
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LWP and can therefore migrate from one LWP to another as time goes on. A
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sleeping thread may not be associated with an LWP at all!
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To make it possible to mess with threads, Sun provides a library called
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libthread_db.so.1 (not to be confused with libthread_db.so.0, which doesn't
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have a published interface). This interface has an upper part, which it
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provides, and a lower part which I provide. The upper part consists of the
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td_* routines, which allow me to find all the threads, query their state,
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etc... The lower part consists of all of the ps_*, which are used by the
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td_* routines to read/write memory, manipulate LWPs, lookup symbols, etc...
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The ps_* routines actually do most of their work by calling functions in
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procfs.c. */
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#include "defs.h"
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/* Undefine gregset_t and fpregset_t to avoid conflict with defs in xm file. */
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@ -44,11 +72,24 @@ extern struct target_ops sol_thread_ops; /* Forward declaration */
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extern int procfs_suppress_run;
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extern struct target_ops procfs_ops; /* target vector for procfs.c */
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/* Note that these prototypes differ slightly from those used in procfs.c
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for of two reasons. One, we can't use gregset_t, as that's got a whole
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different meaning under Solaris (also, see above). Two, we can't use the
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pointer form here as these are actually arrays of ints (for Sparc's at
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least), and are automatically coerced into pointers to ints when used as
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parameters. That makes it impossible to avoid a compiler warning when
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passing pr{g fp}regset_t's from a parameter to an argument of one of
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these functions. */
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extern void supply_gregset PARAMS ((const prgregset_t));
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extern void fill_gregset PARAMS ((prgregset_t, int));
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extern void supply_fpregset PARAMS ((const prfpregset_t));
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extern void fill_fpregset PARAMS ((prfpregset_t, int));
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/* This struct is defined by us, but mainly used for the proc_service interface.
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We don't have much use for it, except as a handy place to get a real pid
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for memory accesses. */
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struct ps_prochandle
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{
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pid_t pid;
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@ -246,8 +287,27 @@ thread_to_lwp (thread_id, default_lwp)
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return lwp;
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}
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/*
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/* Convert an LWP id to a thread. */
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LOCAL FUNCTION
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lwp_to_thread - Convert a LWP id to a Posix or Solaris thread id.
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SYNOPSIS
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int lwp_to_thread (lwp_id)
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DESCRIPTION
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This function converts a lightweight process id to a Posix or Solaris
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thread id. If thread_id is non-existent, that's an error.
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NOTES
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This function probably shouldn't call error()...
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*/
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static int
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lwp_to_thread (lwp)
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@ -281,6 +341,34 @@ lwp_to_thread (lwp)
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return thread_id;
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}
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/*
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LOCAL FUNCTION
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save_inferior_pid - Save inferior_pid on the cleanup list
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restore_inferior_pid - Restore inferior_pid from the cleanup list
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SYNOPSIS
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struct cleanup *save_inferior_pid ()
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void restore_inferior_pid (int pid)
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DESCRIPTION
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These two functions act in unison to restore inferior_pid in
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case of an error.
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NOTES
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inferior_pid is a global variable that needs to be changed by many of
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these routines before calling functions in procfs.c. In order to
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guarantee that inferior_pid gets restored (in case of errors), you
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need to call save_inferior_pid before changing it. At the end of the
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function, you should invoke do_cleanups to restore it.
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*/
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static struct cleanup *
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save_inferior_pid ()
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{
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@ -294,6 +382,11 @@ restore_inferior_pid (pid)
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inferior_pid = pid;
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}
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/* Most target vector functions from here on actually just pass through to
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procfs.c, as they don't need to do anything specific for threads. */
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/* ARGSUSED */
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static void
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sol_thread_open (arg, from_tty)
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@ -334,7 +427,8 @@ sol_thread_detach (args, from_tty)
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/* Resume execution of process PID. If STEP is nozero, then
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just single step it. If SIGNAL is nonzero, restart it with that
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signal activated. */
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signal activated. We may have to convert pid from a thread-id to an LWP id
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for procfs. */
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static void
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sol_thread_resume (pid, step, signo)
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@ -349,14 +443,19 @@ sol_thread_resume (pid, step, signo)
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inferior_pid = thread_to_lwp (inferior_pid, main_ph.pid);
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if (pid != -1)
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pid = thread_to_lwp (pid, -1);
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{
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pid = thread_to_lwp (pid, -2);
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if (pid == -2) /* Inactive thread */
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error ("This version of Solaris can't start inactive threads.");
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}
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procfs_ops.to_resume (pid, step, signo);
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do_cleanups (old_chain);
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}
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/* Wait for any LWPs to stop */
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/* Wait for any threads to stop. We may have to convert PID from a thread id
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to a LWP id, and vice versa on the way out. */
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static int
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sol_thread_wait (pid, ourstatus)
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@ -367,9 +466,6 @@ sol_thread_wait (pid, ourstatus)
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int save_pid;
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struct cleanup *old_chain;
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if (!sol_thread_active)
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return procfs_ops.to_wait (pid, ourstatus);
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save_pid = inferior_pid;
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old_chain = save_inferior_pid ();
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@ -415,13 +511,6 @@ sol_thread_fetch_registers (regno)
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caddr_t xregset;
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#endif
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if (!sol_thread_active
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|| is_lwp (inferior_pid))
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{
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procfs_ops.to_fetch_registers (regno);
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return;
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}
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/* Convert inferior_pid into a td_thrhandle_t */
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thread = GET_THREAD (inferior_pid);
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@ -495,13 +584,6 @@ sol_thread_store_registers (regno)
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caddr_t xregset;
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#endif
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if (!sol_thread_active
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|| is_lwp (inferior_pid))
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{
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procfs_ops.to_store_registers (regno);
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return;
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}
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/* Convert inferior_pid into a td_thrhandle_t */
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thread = GET_THREAD (inferior_pid);
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@ -646,7 +728,10 @@ sol_thread_create_inferior (exec_file, allargs, env)
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}
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/* This routine is called whenever a new symbol table is read in, or when all
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symbol tables are removed. */
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symbol tables are removed. libthread_db can only be initialized when it
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finds the right variables in libthread.so. Since it's a shared library,
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those variables don't show up until the library gets mapped and the symbol
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table is read in. */
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void
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sol_thread_new_objfile (objfile)
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@ -687,34 +772,33 @@ sol_thread_mourn_inferior ()
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}
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/* Mark our target-struct as eligible for stray "run" and "attach" commands. */
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static int
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sol_thread_can_run ()
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{
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return procfs_suppress_run;
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}
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int
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static int
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sol_thread_alive (pid)
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int pid;
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{
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return 1;
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}
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void
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static void
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sol_thread_stop ()
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{
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procfs_ops.to_stop ();
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}
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/* These routines implement the lower half of the thread_db interface. Ie: the
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ps_* routines. */
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/* Service routines we must supply to libthread_db */
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struct lwp_map
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{
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struct lwp_map *next;
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pid_t pid;
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lwpid_t lwp;
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int lwpfd;
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};
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/* The next four routines are called by thread_db to tell us to stop and stop
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a particular process or lwp. Since GDB ensures that these are all stopped
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by the time we call anything in thread_db, these routines need to do
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nothing. */
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ps_err_e
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ps_pstop (const struct ps_prochandle *ph)
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@ -756,6 +840,8 @@ ps_pglobal_lookup (const struct ps_prochandle *ph, const char *ld_object_name,
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return PS_OK;
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}
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/* Common routine for reading and writing memory. */
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static ps_err_e
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rw_common (int dowrite, const struct ps_prochandle *ph, paddr_t addr,
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char *buf, int size)
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@ -817,6 +903,8 @@ ps_ptwrite (const struct ps_prochandle *ph, paddr_t addr, char *buf, int size)
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return rw_common (1, ph, addr, buf, size);
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}
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/* Get integer regs */
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ps_err_e
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ps_lgetregs (const struct ps_prochandle *ph, lwpid_t lwpid,
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prgregset_t gregset)
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@ -835,6 +923,8 @@ ps_lgetregs (const struct ps_prochandle *ph, lwpid_t lwpid,
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return PS_OK;
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}
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/* Set integer regs */
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ps_err_e
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ps_lsetregs (const struct ps_prochandle *ph, lwpid_t lwpid,
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const prgregset_t gregset)
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@ -863,6 +953,8 @@ ps_plog (const char *fmt, ...)
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vfprintf_filtered (gdb_stderr, fmt, args);
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}
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/* Get size of extra register set. Currently a noop. */
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ps_err_e
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ps_lgetxregsize (const struct ps_prochandle *ph, lwpid_t lwpid, int *xregsize)
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{
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@ -889,6 +981,8 @@ ps_lgetxregsize (const struct ps_prochandle *ph, lwpid_t lwpid, int *xregsize)
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return PS_OK;
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}
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/* Get extra register set. Currently a noop. */
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ps_err_e
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ps_lgetxregs (const struct ps_prochandle *ph, lwpid_t lwpid, caddr_t xregset)
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{
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@ -910,6 +1004,8 @@ ps_lgetxregs (const struct ps_prochandle *ph, lwpid_t lwpid, caddr_t xregset)
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return PS_OK;
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}
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/* Set extra register set. Currently a noop. */
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ps_err_e
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ps_lsetxregs (const struct ps_prochandle *ph, lwpid_t lwpid, caddr_t xregset)
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{
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@ -931,6 +1027,8 @@ ps_lsetxregs (const struct ps_prochandle *ph, lwpid_t lwpid, caddr_t xregset)
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return PS_OK;
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}
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/* Get floating-point regs. */
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ps_err_e
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ps_lgetfpregs (const struct ps_prochandle *ph, lwpid_t lwpid,
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prfpregset_t *fpregset)
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@ -949,6 +1047,8 @@ ps_lgetfpregs (const struct ps_prochandle *ph, lwpid_t lwpid,
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return PS_OK;
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}
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/* Set floating-point regs. */
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ps_err_e
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ps_lsetfpregs (const struct ps_prochandle *ph, lwpid_t lwpid,
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const prfpregset_t *fpregset)
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@ -967,6 +1067,8 @@ ps_lsetfpregs (const struct ps_prochandle *ph, lwpid_t lwpid,
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return PS_OK;
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}
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/* Convert a pid to printable form. */
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char *
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solaris_pid_to_str (pid)
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int pid;
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