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aix-thread.c
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aix-thread.c
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/* Low level interface for debugging AIX 4.3+ pthreads.
Copyright (C) 1999-2019 Free Software Foundation, Inc.
Written by Nick Duffek <[email protected]>.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
/* This module uses the libpthdebug.a library provided by AIX 4.3+ for
debugging pthread applications.
Some name prefix conventions:
pthdb_ provided by libpthdebug.a
pdc_ callbacks that this module provides to libpthdebug.a
pd_ variables or functions interfacing with libpthdebug.a
libpthdebug peculiarities:
- pthdb_ptid_pthread() is prototyped in <sys/pthdebug.h>, but
it's not documented, and after several calls it stops working
and causes other libpthdebug functions to fail.
- pthdb_tid_pthread() doesn't always work after
pthdb_session_update(), but it does work after cycling through
all threads using pthdb_pthread().
*/
#include "defs.h"
#include "gdbthread.h"
#include "target.h"
#include "inferior.h"
#include "regcache.h"
#include "gdbcmd.h"
#include "ppc-tdep.h"
#include "observable.h"
#include "objfiles.h"
#include <procinfo.h>
#include <sys/types.h>
#include <sys/ptrace.h>
#include <sys/reg.h>
#include <sched.h>
#include <sys/pthdebug.h>
#if !HAVE_DECL_GETTHRDS
extern int getthrds (pid_t, struct thrdsinfo64 *, int, tid_t *, int);
#endif
/* Whether to emit debugging output. */
static int debug_aix_thread;
/* In AIX 5.1, functions use pthdb_tid_t instead of tid_t. */
#ifndef PTHDB_VERSION_3
#define pthdb_tid_t tid_t
#endif
/* Return whether to treat PID as a debuggable thread id. */
#define PD_TID(ptid) (pd_active && ptid.tid () != 0)
/* pthdb_user_t value that we pass to pthdb functions. 0 causes
PTHDB_BAD_USER errors, so use 1. */
#define PD_USER 1
/* Success and failure values returned by pthdb callbacks. */
#define PDC_SUCCESS PTHDB_SUCCESS
#define PDC_FAILURE PTHDB_CALLBACK
/* Private data attached to each element in GDB's thread list. */
struct aix_thread_info : public private_thread_info
{
pthdb_pthread_t pdtid; /* thread's libpthdebug id */
pthdb_tid_t tid; /* kernel thread id */
};
/* Return the aix_thread_info attached to THREAD. */
static aix_thread_info *
get_aix_thread_info (thread_info *thread)
{
return static_cast<aix_thread_info *> (thread->priv.get ());
}
/* Information about a thread of which libpthdebug is aware. */
struct pd_thread {
pthdb_pthread_t pdtid;
pthread_t pthid;
pthdb_tid_t tid;
};
/* This module's target-specific operations, active while pd_able is true. */
static const target_info aix_thread_target_info = {
"aix-threads",
N_("AIX pthread support"),
N_("AIX pthread support")
};
class aix_thread_target final : public target_ops
{
public:
const target_info &info () const override
{ return aix_thread_target_info; }
strata stratum () const override { return thread_stratum; }
void detach (inferior *, int) override;
void resume (ptid_t, int, enum gdb_signal) override;
ptid_t wait (ptid_t, struct target_waitstatus *, int) override;
void fetch_registers (struct regcache *, int) override;
void store_registers (struct regcache *, int) override;
enum target_xfer_status xfer_partial (enum target_object object,
const char *annex,
gdb_byte *readbuf,
const gdb_byte *writebuf,
ULONGEST offset, ULONGEST len,
ULONGEST *xfered_len) override;
void mourn_inferior () override;
bool thread_alive (ptid_t ptid) override;
const char *pid_to_str (ptid_t) override;
const char *extra_thread_info (struct thread_info *) override;
ptid_t get_ada_task_ptid (long lwp, long thread) override;
};
static aix_thread_target aix_thread_ops;
/* Address of the function that libpthread will call when libpthdebug
is ready to be initialized. */
static CORE_ADDR pd_brk_addr;
/* Whether the current application is debuggable by pthdb. */
static int pd_able = 0;
/* Whether a threaded application is being debugged. */
static int pd_active = 0;
/* Whether the current architecture is 64-bit.
Only valid when pd_able is true. */
static int arch64;
/* Forward declarations for pthdb callbacks. */
static int pdc_symbol_addrs (pthdb_user_t, pthdb_symbol_t *, int);
static int pdc_read_data (pthdb_user_t, void *, pthdb_addr_t, size_t);
static int pdc_write_data (pthdb_user_t, void *, pthdb_addr_t, size_t);
static int pdc_read_regs (pthdb_user_t user, pthdb_tid_t tid,
unsigned long long flags,
pthdb_context_t *context);
static int pdc_write_regs (pthdb_user_t user, pthdb_tid_t tid,
unsigned long long flags,
pthdb_context_t *context);
static int pdc_alloc (pthdb_user_t, size_t, void **);
static int pdc_realloc (pthdb_user_t, void *, size_t, void **);
static int pdc_dealloc (pthdb_user_t, void *);
/* pthdb callbacks. */
static pthdb_callbacks_t pd_callbacks = {
pdc_symbol_addrs,
pdc_read_data,
pdc_write_data,
pdc_read_regs,
pdc_write_regs,
pdc_alloc,
pdc_realloc,
pdc_dealloc,
NULL
};
/* Current pthdb session. */
static pthdb_session_t pd_session;
/* Return a printable representation of pthdebug function return
STATUS. */
static const char *
pd_status2str (int status)
{
switch (status)
{
case PTHDB_SUCCESS: return "SUCCESS";
case PTHDB_NOSYS: return "NOSYS";
case PTHDB_NOTSUP: return "NOTSUP";
case PTHDB_BAD_VERSION: return "BAD_VERSION";
case PTHDB_BAD_USER: return "BAD_USER";
case PTHDB_BAD_SESSION: return "BAD_SESSION";
case PTHDB_BAD_MODE: return "BAD_MODE";
case PTHDB_BAD_FLAGS: return "BAD_FLAGS";
case PTHDB_BAD_CALLBACK: return "BAD_CALLBACK";
case PTHDB_BAD_POINTER: return "BAD_POINTER";
case PTHDB_BAD_CMD: return "BAD_CMD";
case PTHDB_BAD_PTHREAD: return "BAD_PTHREAD";
case PTHDB_BAD_ATTR: return "BAD_ATTR";
case PTHDB_BAD_MUTEX: return "BAD_MUTEX";
case PTHDB_BAD_MUTEXATTR: return "BAD_MUTEXATTR";
case PTHDB_BAD_COND: return "BAD_COND";
case PTHDB_BAD_CONDATTR: return "BAD_CONDATTR";
case PTHDB_BAD_RWLOCK: return "BAD_RWLOCK";
case PTHDB_BAD_RWLOCKATTR: return "BAD_RWLOCKATTR";
case PTHDB_BAD_KEY: return "BAD_KEY";
case PTHDB_BAD_PTID: return "BAD_PTID";
case PTHDB_BAD_TID: return "BAD_TID";
case PTHDB_CALLBACK: return "CALLBACK";
case PTHDB_CONTEXT: return "CONTEXT";
case PTHDB_HELD: return "HELD";
case PTHDB_NOT_HELD: return "NOT_HELD";
case PTHDB_MEMORY: return "MEMORY";
case PTHDB_NOT_PTHREADED: return "NOT_PTHREADED";
case PTHDB_SYMBOL: return "SYMBOL";
case PTHDB_NOT_AVAIL: return "NOT_AVAIL";
case PTHDB_INTERNAL: return "INTERNAL";
default: return "UNKNOWN";
}
}
/* A call to ptrace(REQ, ID, ...) just returned RET. Check for
exceptional conditions and either return nonlocally or else return
1 for success and 0 for failure. */
static int
ptrace_check (int req, int id, int ret)
{
if (ret == 0 && !errno)
return 1;
/* According to ptrace(2), ptrace may fail with EPERM if "the
Identifier parameter corresponds to a kernel thread which is
stopped in kernel mode and whose computational state cannot be
read or written." This happens quite often with register reads. */
switch (req)
{
case PTT_READ_GPRS:
case PTT_READ_FPRS:
case PTT_READ_SPRS:
if (ret == -1 && errno == EPERM)
{
if (debug_aix_thread)
fprintf_unfiltered (gdb_stdlog,
"ptrace (%d, %d) = %d (errno = %d)\n",
req, id, ret, errno);
return ret == -1 ? 0 : 1;
}
break;
}
error (_("aix-thread: ptrace (%d, %d) returned %d (errno = %d %s)"),
req, id, ret, errno, safe_strerror (errno));
return 0; /* Not reached. */
}
/* Call ptracex (REQ, ID, ADDR, DATA, BUF) or
ptrace64 (REQ, ID, ADDR, DATA, BUF) if HAVE_PTRACE64.
Return success. */
#ifdef HAVE_PTRACE64
# define ptracex(request, pid, addr, data, buf) \
ptrace64 (request, pid, addr, data, buf)
#endif
static int
ptrace64aix (int req, int id, long long addr, int data, int *buf)
{
errno = 0;
return ptrace_check (req, id, ptracex (req, id, addr, data, buf));
}
/* Call ptrace (REQ, ID, ADDR, DATA, BUF) or
ptrace64 (REQ, ID, ADDR, DATA, BUF) if HAVE_PTRACE64.
Return success. */
#ifdef HAVE_PTRACE64
# define ptrace(request, pid, addr, data, buf) \
ptrace64 (request, pid, addr, data, buf)
# define addr_ptr long long
#else
# define addr_ptr int *
#endif
static int
ptrace32 (int req, int id, addr_ptr addr, int data, int *buf)
{
errno = 0;
return ptrace_check (req, id,
ptrace (req, id, addr, data, buf));
}
/* If *PIDP is a composite process/thread id, convert it to a
process id. */
static void
pid_to_prc (ptid_t *ptidp)
{
ptid_t ptid;
ptid = *ptidp;
if (PD_TID (ptid))
*ptidp = ptid_t (ptid.pid ());
}
/* pthdb callback: for <i> from 0 to COUNT, set SYMBOLS[<i>].addr to
the address of SYMBOLS[<i>].name. */
static int
pdc_symbol_addrs (pthdb_user_t user, pthdb_symbol_t *symbols, int count)
{
struct bound_minimal_symbol ms;
int i;
char *name;
if (debug_aix_thread)
fprintf_unfiltered (gdb_stdlog,
"pdc_symbol_addrs (user = %ld, symbols = 0x%lx, count = %d)\n",
user, (long) symbols, count);
for (i = 0; i < count; i++)
{
name = symbols[i].name;
if (debug_aix_thread)
fprintf_unfiltered (gdb_stdlog,
" symbols[%d].name = \"%s\"\n", i, name);
if (!*name)
symbols[i].addr = 0;
else
{
ms = lookup_minimal_symbol (name, NULL, NULL);
if (ms.minsym == NULL)
{
if (debug_aix_thread)
fprintf_unfiltered (gdb_stdlog, " returning PDC_FAILURE\n");
return PDC_FAILURE;
}
symbols[i].addr = BMSYMBOL_VALUE_ADDRESS (ms);
}
if (debug_aix_thread)
fprintf_unfiltered (gdb_stdlog, " symbols[%d].addr = %s\n",
i, hex_string (symbols[i].addr));
}
if (debug_aix_thread)
fprintf_unfiltered (gdb_stdlog, " returning PDC_SUCCESS\n");
return PDC_SUCCESS;
}
/* Read registers call back function should be able to read the
context information of a debuggee kernel thread from an active
process or from a core file. The information should be formatted
in context64 form for both 32-bit and 64-bit process.
If successful return 0, else non-zero is returned. */
static int
pdc_read_regs (pthdb_user_t user,
pthdb_tid_t tid,
unsigned long long flags,
pthdb_context_t *context)
{
/* This function doesn't appear to be used, so we could probably
just return 0 here. HOWEVER, if it is not defined, the OS will
complain and several thread debug functions will fail. In case
this is needed, I have implemented what I think it should do,
however this code is untested. */
uint64_t gprs64[ppc_num_gprs];
uint32_t gprs32[ppc_num_gprs];
double fprs[ppc_num_fprs];
struct ptxsprs sprs64;
struct ptsprs sprs32;
if (debug_aix_thread)
fprintf_unfiltered (gdb_stdlog, "pdc_read_regs tid=%d flags=%s\n",
(int) tid, hex_string (flags));
/* General-purpose registers. */
if (flags & PTHDB_FLAG_GPRS)
{
if (arch64)
{
if (!ptrace64aix (PTT_READ_GPRS, tid,
(unsigned long) gprs64, 0, NULL))
memset (gprs64, 0, sizeof (gprs64));
memcpy (context->gpr, gprs64, sizeof(gprs64));
}
else
{
if (!ptrace32 (PTT_READ_GPRS, tid, (uintptr_t) gprs32, 0, NULL))
memset (gprs32, 0, sizeof (gprs32));
memcpy (context->gpr, gprs32, sizeof(gprs32));
}
}
/* Floating-point registers. */
if (flags & PTHDB_FLAG_FPRS)
{
if (!ptrace32 (PTT_READ_FPRS, tid, (uintptr_t) fprs, 0, NULL))
memset (fprs, 0, sizeof (fprs));
memcpy (context->fpr, fprs, sizeof(fprs));
}
/* Special-purpose registers. */
if (flags & PTHDB_FLAG_SPRS)
{
if (arch64)
{
if (!ptrace64aix (PTT_READ_SPRS, tid,
(unsigned long) &sprs64, 0, NULL))
memset (&sprs64, 0, sizeof (sprs64));
memcpy (&context->msr, &sprs64, sizeof(sprs64));
}
else
{
if (!ptrace32 (PTT_READ_SPRS, tid, (uintptr_t) &sprs32, 0, NULL))
memset (&sprs32, 0, sizeof (sprs32));
memcpy (&context->msr, &sprs32, sizeof(sprs32));
}
}
return 0;
}
/* Write register function should be able to write requested context
information to specified debuggee's kernel thread id.
If successful return 0, else non-zero is returned. */
static int
pdc_write_regs (pthdb_user_t user,
pthdb_tid_t tid,
unsigned long long flags,
pthdb_context_t *context)
{
/* This function doesn't appear to be used, so we could probably
just return 0 here. HOWEVER, if it is not defined, the OS will
complain and several thread debug functions will fail. In case
this is needed, I have implemented what I think it should do,
however this code is untested. */
if (debug_aix_thread)
fprintf_unfiltered (gdb_stdlog, "pdc_write_regs tid=%d flags=%s\n",
(int) tid, hex_string (flags));
/* General-purpose registers. */
if (flags & PTHDB_FLAG_GPRS)
{
if (arch64)
ptrace64aix (PTT_WRITE_GPRS, tid,
(unsigned long) context->gpr, 0, NULL);
else
ptrace32 (PTT_WRITE_GPRS, tid, (uintptr_t) context->gpr, 0, NULL);
}
/* Floating-point registers. */
if (flags & PTHDB_FLAG_FPRS)
{
ptrace32 (PTT_WRITE_FPRS, tid, (uintptr_t) context->fpr, 0, NULL);
}
/* Special-purpose registers. */
if (flags & PTHDB_FLAG_SPRS)
{
if (arch64)
{
ptrace64aix (PTT_WRITE_SPRS, tid,
(unsigned long) &context->msr, 0, NULL);
}
else
{
ptrace32 (PTT_WRITE_SPRS, tid, (uintptr_t) &context->msr, 0, NULL);
}
}
return 0;
}
/* pthdb callback: read LEN bytes from process ADDR into BUF. */
static int
pdc_read_data (pthdb_user_t user, void *buf,
pthdb_addr_t addr, size_t len)
{
int status, ret;
if (debug_aix_thread)
fprintf_unfiltered (gdb_stdlog,
"pdc_read_data (user = %ld, buf = 0x%lx, addr = %s, len = %ld)\n",
user, (long) buf, hex_string (addr), len);
status = target_read_memory (addr, (gdb_byte *) buf, len);
ret = status == 0 ? PDC_SUCCESS : PDC_FAILURE;
if (debug_aix_thread)
fprintf_unfiltered (gdb_stdlog, " status=%d, returning %s\n",
status, pd_status2str (ret));
return ret;
}
/* pthdb callback: write LEN bytes from BUF to process ADDR. */
static int
pdc_write_data (pthdb_user_t user, void *buf,
pthdb_addr_t addr, size_t len)
{
int status, ret;
if (debug_aix_thread)
fprintf_unfiltered (gdb_stdlog,
"pdc_write_data (user = %ld, buf = 0x%lx, addr = %s, len = %ld)\n",
user, (long) buf, hex_string (addr), len);
status = target_write_memory (addr, (gdb_byte *) buf, len);
ret = status == 0 ? PDC_SUCCESS : PDC_FAILURE;
if (debug_aix_thread)
fprintf_unfiltered (gdb_stdlog, " status=%d, returning %s\n", status,
pd_status2str (ret));
return ret;
}
/* pthdb callback: allocate a LEN-byte buffer and store a pointer to it
in BUFP. */
static int
pdc_alloc (pthdb_user_t user, size_t len, void **bufp)
{
if (debug_aix_thread)
fprintf_unfiltered (gdb_stdlog,
"pdc_alloc (user = %ld, len = %ld, bufp = 0x%lx)\n",
user, len, (long) bufp);
*bufp = xmalloc (len);
if (debug_aix_thread)
fprintf_unfiltered (gdb_stdlog,
" malloc returned 0x%lx\n", (long) *bufp);
/* Note: xmalloc() can't return 0; therefore PDC_FAILURE will never
be returned. */
return *bufp ? PDC_SUCCESS : PDC_FAILURE;
}
/* pthdb callback: reallocate BUF, which was allocated by the alloc or
realloc callback, so that it contains LEN bytes, and store a
pointer to the result in BUFP. */
static int
pdc_realloc (pthdb_user_t user, void *buf, size_t len, void **bufp)
{
if (debug_aix_thread)
fprintf_unfiltered (gdb_stdlog,
"pdc_realloc (user = %ld, buf = 0x%lx, len = %ld, bufp = 0x%lx)\n",
user, (long) buf, len, (long) bufp);
*bufp = xrealloc (buf, len);
if (debug_aix_thread)
fprintf_unfiltered (gdb_stdlog,
" realloc returned 0x%lx\n", (long) *bufp);
return *bufp ? PDC_SUCCESS : PDC_FAILURE;
}
/* pthdb callback: free BUF, which was allocated by the alloc or
realloc callback. */
static int
pdc_dealloc (pthdb_user_t user, void *buf)
{
if (debug_aix_thread)
fprintf_unfiltered (gdb_stdlog,
"pdc_free (user = %ld, buf = 0x%lx)\n", user,
(long) buf);
xfree (buf);
return PDC_SUCCESS;
}
/* Return a printable representation of pthread STATE. */
static char *
state2str (pthdb_state_t state)
{
switch (state)
{
case PST_IDLE:
/* i18n: Like "Thread-Id %d, [state] idle" */
return _("idle"); /* being created */
case PST_RUN:
/* i18n: Like "Thread-Id %d, [state] running" */
return _("running"); /* running */
case PST_SLEEP:
/* i18n: Like "Thread-Id %d, [state] sleeping" */
return _("sleeping"); /* awaiting an event */
case PST_READY:
/* i18n: Like "Thread-Id %d, [state] ready" */
return _("ready"); /* runnable */
case PST_TERM:
/* i18n: Like "Thread-Id %d, [state] finished" */
return _("finished"); /* awaiting a join/detach */
default:
/* i18n: Like "Thread-Id %d, [state] unknown" */
return _("unknown");
}
}
/* qsort() comparison function for sorting pd_thread structs by pthid. */
static int
pcmp (const void *p1v, const void *p2v)
{
struct pd_thread *p1 = (struct pd_thread *) p1v;
struct pd_thread *p2 = (struct pd_thread *) p2v;
return p1->pthid < p2->pthid ? -1 : p1->pthid > p2->pthid;
}
/* iterate_over_threads() callback for counting GDB threads.
Do not count the main thread (whose tid is zero). This matches
the list of threads provided by the pthreaddebug library, which
does not include that main thread either, and thus allows us
to compare the two lists. */
static int
giter_count (struct thread_info *thread, void *countp)
{
if (PD_TID (thread->ptid))
(*(int *) countp)++;
return 0;
}
/* iterate_over_threads() callback for accumulating GDB thread pids.
Do not include the main thread (whose tid is zero). This matches
the list of threads provided by the pthreaddebug library, which
does not include that main thread either, and thus allows us
to compare the two lists. */
static int
giter_accum (struct thread_info *thread, void *bufp)
{
if (PD_TID (thread->ptid))
{
**(struct thread_info ***) bufp = thread;
(*(struct thread_info ***) bufp)++;
}
return 0;
}
/* ptid comparison function */
static int
ptid_cmp (ptid_t ptid1, ptid_t ptid2)
{
int pid1, pid2;
if (ptid1.pid () < ptid2.pid ())
return -1;
else if (ptid1.pid () > ptid2.pid ())
return 1;
else if (ptid1.tid () < ptid2.tid ())
return -1;
else if (ptid1.tid () > ptid2.tid ())
return 1;
else if (ptid1.lwp () < ptid2.lwp ())
return -1;
else if (ptid1.lwp () > ptid2.lwp ())
return 1;
else
return 0;
}
/* qsort() comparison function for sorting thread_info structs by pid. */
static int
gcmp (const void *t1v, const void *t2v)
{
struct thread_info *t1 = *(struct thread_info **) t1v;
struct thread_info *t2 = *(struct thread_info **) t2v;
return ptid_cmp (t1->ptid, t2->ptid);
}
/* Search through the list of all kernel threads for the thread
that has stopped on a SIGTRAP signal, and return its TID.
Return 0 if none found. */
static pthdb_tid_t
get_signaled_thread (void)
{
struct thrdsinfo64 thrinf;
tid_t ktid = 0;
int result = 0;
while (1)
{
if (getthrds (inferior_ptid.pid (), &thrinf,
sizeof (thrinf), &ktid, 1) != 1)
break;
if (thrinf.ti_cursig == SIGTRAP)
return thrinf.ti_tid;
}
/* Didn't find any thread stopped on a SIGTRAP signal. */
return 0;
}
/* Synchronize GDB's thread list with libpthdebug's.
There are some benefits of doing this every time the inferior stops:
- allows users to run thread-specific commands without needing to
run "info threads" first
- helps pthdb_tid_pthread() work properly (see "libpthdebug
peculiarities" at the top of this module)
- simplifies the demands placed on libpthdebug, which seems to
have difficulty with certain call patterns */
static void
sync_threadlists (void)
{
int cmd, status, infpid;
int pcount, psize, pi, gcount, gi;
struct pd_thread *pbuf;
struct thread_info **gbuf, **g, *thread;
pthdb_pthread_t pdtid;
pthread_t pthid;
pthdb_tid_t tid;
/* Accumulate an array of libpthdebug threads sorted by pthread id. */
pcount = 0;
psize = 1;
pbuf = XNEWVEC (struct pd_thread, psize);
for (cmd = PTHDB_LIST_FIRST;; cmd = PTHDB_LIST_NEXT)
{
status = pthdb_pthread (pd_session, &pdtid, cmd);
if (status != PTHDB_SUCCESS || pdtid == PTHDB_INVALID_PTHREAD)
break;
status = pthdb_pthread_ptid (pd_session, pdtid, &pthid);
if (status != PTHDB_SUCCESS || pthid == PTHDB_INVALID_PTID)
continue;
if (pcount == psize)
{
psize *= 2;
pbuf = (struct pd_thread *) xrealloc (pbuf,
psize * sizeof *pbuf);
}
pbuf[pcount].pdtid = pdtid;
pbuf[pcount].pthid = pthid;
pcount++;
}
for (pi = 0; pi < pcount; pi++)
{
status = pthdb_pthread_tid (pd_session, pbuf[pi].pdtid, &tid);
if (status != PTHDB_SUCCESS)
tid = PTHDB_INVALID_TID;
pbuf[pi].tid = tid;
}
qsort (pbuf, pcount, sizeof *pbuf, pcmp);
/* Accumulate an array of GDB threads sorted by pid. */
gcount = 0;
iterate_over_threads (giter_count, &gcount);
g = gbuf = XNEWVEC (struct thread_info *, gcount);
iterate_over_threads (giter_accum, &g);
qsort (gbuf, gcount, sizeof *gbuf, gcmp);
/* Apply differences between the two arrays to GDB's thread list. */
infpid = inferior_ptid.pid ();
for (pi = gi = 0; pi < pcount || gi < gcount;)
{
if (pi == pcount)
{
delete_thread (gbuf[gi]);
gi++;
}
else if (gi == gcount)
{
aix_thread_info *priv = new aix_thread_info;
priv->pdtid = pbuf[pi].pdtid;
priv->tid = pbuf[pi].tid;
thread = add_thread_with_info (ptid_t (infpid, 0, pbuf[pi].pthid), priv);
pi++;
}
else
{
ptid_t pptid, gptid;
int cmp_result;
pptid = ptid_t (infpid, 0, pbuf[pi].pthid);
gptid = gbuf[gi]->ptid;
pdtid = pbuf[pi].pdtid;
tid = pbuf[pi].tid;
cmp_result = ptid_cmp (pptid, gptid);
if (cmp_result == 0)
{
aix_thread_info *priv = get_aix_thread_info (gbuf[gi]);
priv->pdtid = pdtid;
priv->tid = tid;
pi++;
gi++;
}
else if (cmp_result > 0)
{
delete_thread (gbuf[gi]);
gi++;
}
else
{
thread = add_thread (pptid);
aix_thread_info *priv = new aix_thread_info;
thread->priv.reset (priv);
priv->pdtid = pdtid;
priv->tid = tid;
pi++;
}
}
}
xfree (pbuf);
xfree (gbuf);
}
/* Iterate_over_threads() callback for locating a thread, using
the TID of its associated kernel thread. */
static int
iter_tid (struct thread_info *thread, void *tidp)
{
const pthdb_tid_t tid = *(pthdb_tid_t *)tidp;
aix_thread_info *priv = get_aix_thread_info (thread);
return priv->tid == tid;
}
/* Synchronize libpthdebug's state with the inferior and with GDB,
generate a composite process/thread <pid> for the current thread,
set inferior_ptid to <pid> if SET_INFPID, and return <pid>. */
static ptid_t
pd_update (int set_infpid)
{
int status;
ptid_t ptid;
pthdb_tid_t tid;
struct thread_info *thread = NULL;
if (!pd_active)
return inferior_ptid;
status = pthdb_session_update (pd_session);
if (status != PTHDB_SUCCESS)
return inferior_ptid;
sync_threadlists ();
/* Define "current thread" as one that just received a trap signal. */
tid = get_signaled_thread ();
if (tid != 0)
thread = iterate_over_threads (iter_tid, &tid);
if (!thread)
ptid = inferior_ptid;
else
{
ptid = thread->ptid;
if (set_infpid)
inferior_ptid = ptid;
}
return ptid;
}
/* Try to start debugging threads in the current process.
If successful and SET_INFPID, set inferior_ptid to reflect the
current thread. */
static ptid_t
pd_activate (int set_infpid)
{
int status;
status = pthdb_session_init (PD_USER, arch64 ? PEM_64BIT : PEM_32BIT,
PTHDB_FLAG_REGS, &pd_callbacks,
&pd_session);
if (status != PTHDB_SUCCESS)
{
return inferior_ptid;
}
pd_active = 1;
return pd_update (set_infpid);
}
/* Undo the effects of pd_activate(). */
static void
pd_deactivate (void)
{
if (!pd_active)
return;
pthdb_session_destroy (pd_session);
pid_to_prc (&inferior_ptid);
pd_active = 0;
}
/* An object file has just been loaded. Check whether the current
application is pthreaded, and if so, prepare for thread debugging. */
static void
pd_enable (void)
{
int status;
char *stub_name;
struct bound_minimal_symbol ms;
/* Don't initialize twice. */
if (pd_able)
return;
/* Check application word size. */
arch64 = register_size (target_gdbarch (), 0) == 8;
/* Check whether the application is pthreaded. */
stub_name = NULL;
status = pthdb_session_pthreaded (PD_USER, PTHDB_FLAG_REGS,
&pd_callbacks, &stub_name);
if ((status != PTHDB_SUCCESS
&& status != PTHDB_NOT_PTHREADED) || !stub_name)
return;
/* Set a breakpoint on the returned stub function. */
ms = lookup_minimal_symbol (stub_name, NULL, NULL);
if (ms.minsym == NULL)
return;
pd_brk_addr = BMSYMBOL_VALUE_ADDRESS (ms);
if (!create_thread_event_breakpoint (target_gdbarch (), pd_brk_addr))
return;
/* Prepare for thread debugging. */
push_target (&aix_thread_ops);
pd_able = 1;
/* If we're debugging a core file or an attached inferior, the
pthread library may already have been initialized, so try to
activate thread debugging. */
pd_activate (1);
}
/* Undo the effects of pd_enable(). */
static void
pd_disable (void)
{
if (!pd_able)
return;
if (pd_active)
pd_deactivate ();
pd_able = 0;
unpush_target (&aix_thread_ops);
}
/* new_objfile observer callback.
If OBJFILE is non-null, check whether a threaded application is
being debugged, and if so, prepare for thread debugging.