/* Low level interface for debugging AIX 4.3+ pthreads. Copyright 1999, 2000, 2002 Free Software Foundation, Inc. Written by Nick Duffek . 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 2 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, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ /* 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 , 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 "gdb_assert.h" #include "gdbthread.h" #include "target.h" #include "inferior.h" #include "regcache.h" #include "gdbcmd.h" #if 0 #include "coff/internal.h" /* for libcoff.h */ #include "bfd/libcoff.h" /* for xcoff_data */ #endif #include #include #include #include #if 0 #include #endif #include #include /* 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_get_tid (ptid) != 0) /* Build a thread ptid. */ #define BUILD_THREAD(TID, PID) ptid_build (PID, 0, TID) /* Build and lwp ptid. */ #define BUILD_LWP(LWP, PID) MERGEPID (PID, LWP) /* 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 private_thread_info { pthdb_pthread_t pdtid; /* thread's libpthdebug id */ pthdb_tid_t tid; /* kernel thread id */ }; /* 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 struct target_ops aix_thread_ops; /* Copy of the target over which ops is pushed. This is more convenient than a pointer to child_ops or core_ops, because they lack current_target's default callbacks. */ static struct target_ops base_target; /* 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; /* Saved pointer to previous owner of target_new_objfile_hook. */ static void (*target_new_objfile_chain)(struct objfile *); /* 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 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)", 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). Return success. */ 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). Return success. */ static int ptrace32 (int req, int id, int *addr, int data, int *buf) { errno = 0; return ptrace_check (req, id, ptrace (req, id, (int *) 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 = pid_to_ptid (PIDGET (ptid)); } /* pthdb callback: for from 0 to COUNT, set SYMBOLS[].addr to the address of SYMBOLS[].name. */ static int pdc_symbol_addrs (pthdb_user_t user, pthdb_symbol_t *symbols, int count) { struct 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)", 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\"", i, name); if (!*name) symbols[i].addr = 0; else { if (!(ms = lookup_minimal_symbol (name, NULL, NULL))) { if (debug_aix_thread) fprintf_unfiltered (gdb_stdlog, " returning PDC_FAILURE"); return PDC_FAILURE; } symbols[i].addr = SYMBOL_VALUE_ADDRESS (ms); } if (debug_aix_thread) fprintf_unfiltered (gdb_stdlog, " symbols[%d].addr = 0x%llx", i, symbols[i].addr); } if (debug_aix_thread) fprintf_unfiltered (gdb_stdlog, " returning PDC_SUCCESS"); 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[32]; uint32_t gprs32[32]; double fprs[32]; struct ptxsprs sprs64; struct ptsprs sprs32; if (debug_aix_thread) fprintf_unfiltered (gdb_stdlog, "pdc_read_regs tid=%d flags=%llx\n", (int) tid, 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, 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, (int *) 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, (int *) &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=%llx\n", (int) tid, 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, (int *) context->gpr, 0, NULL); } /* Floating-point registers. */ if (flags & PTHDB_FLAG_FPRS) { ptrace32 (PTT_WRITE_FPRS, tid, (int *) 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, (int *) &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 = 0x%llx, len = %ld)", user, (long) buf, addr, len); status = target_read_memory (addr, buf, len); ret = status == 0 ? PDC_SUCCESS : PDC_FAILURE; if (debug_aix_thread) fprintf_unfiltered (gdb_stdlog, " status=%d, returning %s", 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 = 0x%llx, len = %ld)", user, (long) buf, addr, len); status = target_write_memory (addr, buf, len); ret = status == 0 ? PDC_SUCCESS : PDC_FAILURE; if (debug_aix_thread) fprintf_unfiltered (gdb_stdlog, " status=%d, returning %s", 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)", user, len, (long) bufp); *bufp = xmalloc (len); if (debug_aix_thread) fprintf_unfiltered (gdb_stdlog, " malloc returned 0x%lx", (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)", user, (long) buf, len, (long) bufp); *bufp = xrealloc (buf, len); if (debug_aix_thread) fprintf_unfiltered (gdb_stdlog, " realloc returned 0x%lx", (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)", 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: return "idle"; /* being created */ case PST_RUN: return "running"; /* running */ case PST_SLEEP: return "sleeping"; /* awaiting an event */ case PST_READY: return "ready"; /* runnable */ case PST_TERM: return "finished"; /* awaiting a join/detach */ default: 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. */ static int giter_count (struct thread_info *thread, void *countp) { (*(int *) countp)++; return 0; } /* iterate_over_threads() callback for accumulating GDB thread pids. */ static int giter_accum (struct thread_info *thread, void *bufp) { **(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 (ptid_get_pid (ptid1) < ptid_get_pid (ptid2)) return -1; else if (ptid_get_pid (ptid1) > ptid_get_pid (ptid2)) return 1; else if (ptid_get_tid (ptid1) < ptid_get_tid (ptid2)) return -1; else if (ptid_get_tid (ptid1) > ptid_get_tid (ptid2)) return 1; else if (ptid_get_lwp (ptid1) < ptid_get_lwp (ptid2)) return -1; else if (ptid_get_lwp (ptid1) > ptid_get_lwp (ptid2)) 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); } /* 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 = (struct pd_thread *) xmalloc (psize * sizeof *pbuf); 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 = (struct thread_info **) xmalloc (gcount * sizeof *gbuf); iterate_over_threads (giter_accum, &g); qsort (gbuf, gcount, sizeof *gbuf, gcmp); /* Apply differences between the two arrays to GDB's thread list. */ infpid = PIDGET (inferior_ptid); for (pi = gi = 0; pi < pcount || gi < gcount;) { if (pi == pcount) { delete_thread (gbuf[gi]->ptid); gi++; } else if (gi == gcount) { thread = add_thread (BUILD_THREAD (pbuf[pi].pthid, infpid)); thread->private = xmalloc (sizeof (struct private_thread_info)); thread->private->pdtid = pbuf[pi].pdtid; thread->private->tid = pbuf[pi].tid; pi++; } else { ptid_t pptid, gptid; int cmp_result; pptid = BUILD_THREAD (pbuf[pi].pthid, infpid); gptid = gbuf[gi]->ptid; pdtid = pbuf[pi].pdtid; tid = pbuf[pi].tid; cmp_result = ptid_cmp (pptid, gptid); if (cmp_result == 0) { gbuf[gi]->private->pdtid = pdtid; gbuf[gi]->private->tid = tid; pi++; gi++; } else if (cmp_result > 0) { delete_thread (gptid); gi++; } else { thread = add_thread (pptid); thread->private = xmalloc (sizeof (struct private_thread_info)); thread->private->pdtid = pdtid; thread->private->tid = tid; pi++; } } } xfree (pbuf); xfree (gbuf); } /* Iterate_over_threads() callback for locating a thread whose kernel thread just received a trap signal. */ static int iter_trap (struct thread_info *thread, void *unused) { struct thrdsinfo64 thrinf; pthdb_tid_t tid; /* getthrds(3) isn't prototyped in any AIX 4.3.3 #include file. */ extern int getthrds (pid_t, struct thrdsinfo64 *, int, pthdb_tid_t *, int); tid = thread->private->tid; if (tid == PTHDB_INVALID_TID) return 0; if (getthrds (PIDGET (inferior_ptid), &thrinf, sizeof (thrinf), &tid, 1) != 1) return 0; return thrinf.ti_cursig == SIGTRAP; } /* Synchronize libpthdebug's state with the inferior and with GDB, generate a composite process/thread for the current thread, set inferior_ptid to if SET_INFPID, and return . */ static ptid_t pd_update (int set_infpid) { int status; ptid_t ptid; struct thread_info *thread; 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. */ thread = iterate_over_threads (iter_trap, NULL); 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 minimal_symbol *ms; /* Don't initialize twice. */ if (pd_able) return; /* Check application word size. */ arch64 = REGISTER_RAW_SIZE (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. */ if (!(ms = lookup_minimal_symbol (stub_name, NULL, NULL))) return; pd_brk_addr = SYMBOL_VALUE_ADDRESS (ms); if (!create_thread_event_breakpoint (pd_brk_addr)) return; /* Prepare for thread debugging. */ base_target = current_target; 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); } /* target_new_objfile_hook callback. If OBJFILE is non-null, check whether a threaded application is being debugged, and if so, prepare for thread debugging. If OBJFILE is null, stop debugging threads. */ static void new_objfile (struct objfile *objfile) { if (objfile) pd_enable (); else pd_disable (); if (target_new_objfile_chain) target_new_objfile_chain (objfile); } /* Attach to process specified by ARGS. */ static void aix_thread_attach (char *args, int from_tty) { base_target.to_attach (args, from_tty); pd_activate (1); } /* Detach from the process attached to by aix_thread_attach(). */ static void aix_thread_detach (char *args, int from_tty) { pd_deactivate (); base_target.to_detach (args, from_tty); } /* Tell the inferior process to continue running thread PID if != -1 and all threads otherwise. */ static void aix_thread_resume (ptid_t ptid, int step, enum target_signal sig) { struct thread_info *thread; pthdb_tid_t tid[2]; if (!PD_TID (ptid)) { struct cleanup *cleanup = save_inferior_ptid (); inferior_ptid = pid_to_ptid (PIDGET (inferior_ptid)); base_target.to_resume (ptid, step, sig); do_cleanups (cleanup); } else { thread = find_thread_pid (ptid); if (!thread) error ("aix-thread resume: unknown pthread %ld", TIDGET (ptid)); tid[0] = thread->private->tid; if (tid[0] == PTHDB_INVALID_TID) error ("aix-thread resume: no tid for pthread %ld", TIDGET (ptid)); tid[1] = 0; if (arch64) ptrace64aix (PTT_CONTINUE, tid[0], 1, target_signal_to_host (sig), (int *) tid); else ptrace32 (PTT_CONTINUE, tid[0], (int *) 1, target_signal_to_host (sig), (int *) tid); } } /* Wait for thread/process ID if != -1 or for any thread otherwise. If an error occurs, return -1, else return the pid of the stopped thread. */ static ptid_t aix_thread_wait (ptid_t ptid, struct target_waitstatus *status) { struct cleanup *cleanup = save_inferior_ptid (); pid_to_prc (&ptid); inferior_ptid = pid_to_ptid (PIDGET (inferior_ptid)); ptid = base_target.to_wait (ptid, status); do_cleanups (cleanup); if (PIDGET (ptid) == -1) return pid_to_ptid (-1); /* Check whether libpthdebug might be ready to be initialized. */ if (!pd_active && status->kind == TARGET_WAITKIND_STOPPED && status->value.sig == TARGET_SIGNAL_TRAP && read_pc_pid (ptid) - DECR_PC_AFTER_BREAK == pd_brk_addr) return pd_activate (0); return pd_update (0); } /* Record that the 64-bit general-purpose registers contain VALS. */ static void supply_gprs64 (uint64_t *vals) { int regno; for (regno = 0; regno < 32; regno++) supply_register (regno, (char *) (vals + regno)); } /* Record that 32-bit register REGNO contains VAL. */ static void supply_reg32 (int regno, uint32_t val) { supply_register (regno, (char *) &val); } /* Record that the floating-point registers contain VALS. */ static void supply_fprs (double *vals) { int regno; for (regno = 0; regno < 32; regno++) supply_register (regno + FP0_REGNUM, (char *) (vals + regno)); } /* Record that the special registers contain the specified 64-bit and 32-bit values. */ static void supply_sprs64 (uint64_t iar, uint64_t msr, uint32_t cr, uint64_t lr, uint64_t ctr, uint32_t xer) { int regno = FIRST_UISA_SP_REGNUM; supply_register (regno, (char *) &iar); supply_register (regno + 1, (char *) &msr); supply_register (regno + 2, (char *) &cr); supply_register (regno + 3, (char *) &lr); supply_register (regno + 4, (char *) &ctr); supply_register (regno + 5, (char *) &xer); } /* Record that the special registers contain the specified 32-bit values. */ static void supply_sprs32 (uint32_t iar, uint32_t msr, uint32_t cr, uint32_t lr, uint32_t ctr, uint32_t xer) { int regno = FIRST_UISA_SP_REGNUM; supply_register (regno, (char *) &iar); supply_register (regno + 1, (char *) &msr); supply_register (regno + 2, (char *) &cr); supply_register (regno + 3, (char *) &lr); supply_register (regno + 4, (char *) &ctr); supply_register (regno + 5, (char *) &xer); } /* Fetch all registers from pthread PDTID, which doesn't have a kernel thread. There's no way to query a single register from a non-kernel pthread, so there's no need for a single-register version of this function. */ static void fetch_regs_user_thread (pthdb_pthread_t pdtid) { int status, i; pthdb_context_t ctx; if (debug_aix_thread) fprintf_unfiltered (gdb_stdlog, "fetch_regs_user_thread %lx\n", (long) pdtid); status = pthdb_pthread_context (pd_session, pdtid, &ctx); if (status != PTHDB_SUCCESS) error ("aix-thread: fetch_registers: pthdb_pthread_context returned %s", pd_status2str (status)); /* General-purpose registers. */ if (arch64) supply_gprs64 (ctx.gpr); else for (i = 0; i < 32; i++) supply_reg32 (i, ctx.gpr[i]); /* Floating-point registers. */ supply_fprs (ctx.fpr); /* Special registers. */ if (arch64) supply_sprs64 (ctx.iar, ctx.msr, ctx.cr, ctx.lr, ctx.ctr, ctx.xer); else supply_sprs32 (ctx.iar, ctx.msr, ctx.cr, ctx.lr, ctx.ctr, ctx.xer); } /* Fetch register REGNO if != -1 or all registers otherwise from kernel thread TID. AIX provides a way to query all of a kernel thread's GPRs, FPRs, or SPRs, but there's no way to query individual registers within those groups. Therefore, if REGNO != -1, this function fetches an entire group. Unfortunately, kernel thread register queries often fail with EPERM, indicating that the thread is in kernel space. This breaks backtraces of threads other than the current one. To make that breakage obvious without throwing an error to top level (which is bad e.g. during "info threads" output), zero registers that can't be retrieved. */ static void fetch_regs_kernel_thread (int regno, pthdb_tid_t tid) { uint64_t gprs64[32]; uint32_t gprs32[32]; double fprs[32]; struct ptxsprs sprs64; struct ptsprs sprs32; int i; if (debug_aix_thread) fprintf_unfiltered (gdb_stdlog, "fetch_regs_kernel_thread tid=%lx regno=%d arch64=%d\n", (long) tid, regno, arch64); /* General-purpose registers. */ if (regno == -1 || regno < FP0_REGNUM) { if (arch64) { if (!ptrace64aix (PTT_READ_GPRS, tid, (unsigned long) gprs64, 0, NULL)) memset (gprs64, 0, sizeof (gprs64)); supply_gprs64 (gprs64); } else { if (!ptrace32 (PTT_READ_GPRS, tid, gprs32, 0, NULL)) memset (gprs32, 0, sizeof (gprs32)); for (i = 0; i < 32; i++) supply_reg32 (i, gprs32[i]); } } /* Floating-point registers. */ if (regno == -1 || (regno >= FP0_REGNUM && regno <= FPLAST_REGNUM)) { if (!ptrace32 (PTT_READ_FPRS, tid, (int *) fprs, 0, NULL)) memset (fprs, 0, sizeof (fprs)); supply_fprs (fprs); } /* Special-purpose registers. */ if (regno == -1 || (regno > FPLAST_REGNUM && regno <= LAST_UISA_SP_REGNUM)) { if (arch64) { if (!ptrace64aix (PTT_READ_SPRS, tid, (unsigned long) &sprs64, 0, NULL)) memset (&sprs64, 0, sizeof (sprs64)); supply_sprs64 (sprs64.pt_iar, sprs64.pt_msr, sprs64.pt_cr, sprs64.pt_lr, sprs64.pt_ctr, sprs64.pt_xer); } else { if (!ptrace32 (PTT_READ_SPRS, tid, (int *) &sprs32, 0, NULL)) memset (&sprs32, 0, sizeof (sprs32)); supply_sprs32 (sprs32.pt_iar, sprs32.pt_msr, sprs32.pt_cr, sprs32.pt_lr, sprs32.pt_ctr, sprs32.pt_xer); if (REGISTER_RAW_SIZE (LAST_UISA_SP_REGNUM)) supply_register (LAST_UISA_SP_REGNUM, (char *) &sprs32.pt_mq); } } } /* Fetch register REGNO if != -1 or all registers otherwise in the thread/process specified by inferior_ptid. */ static void aix_thread_fetch_registers (int regno) { struct thread_info *thread; pthdb_tid_t tid; if (!PD_TID (inferior_ptid)) base_target.to_fetch_registers (regno); else { thread = find_thread_pid (inferior_ptid); tid = thread->private->tid; if (tid == PTHDB_INVALID_TID) fetch_regs_user_thread (thread->private->pdtid); else fetch_regs_kernel_thread (regno, tid); } } /* Store the gp registers into an array of uint32_t or uint64_t. */ static void fill_gprs64 (uint64_t *vals) { int regno; for (regno = 0; regno < FP0_REGNUM; regno++) if (register_cached (regno)) regcache_collect (regno, vals + regno); } static void fill_gprs32 (uint32_t *vals) { int regno; for (regno = 0; regno < FP0_REGNUM; regno++) if (register_cached (regno)) regcache_collect (regno, vals + regno); } /* Store the floating point registers into a double array. */ static void fill_fprs (double *vals) { int regno; for (regno = FP0_REGNUM; regno < FPLAST_REGNUM; regno++) if (register_cached (regno)) regcache_collect (regno, vals + regno); } /* Store the special registers into the specified 64-bit and 32-bit locations. */ static void fill_sprs64 (uint64_t *iar, uint64_t *msr, uint32_t *cr, uint64_t *lr, uint64_t *ctr, uint32_t *xer) { int regno = FIRST_UISA_SP_REGNUM; gdb_assert (sizeof (*iar) == REGISTER_RAW_SIZE (regno)); if (register_cached (regno)) regcache_collect (regno, iar); if (register_cached (regno + 1)) regcache_collect (regno + 1, msr); if (register_cached (regno + 2)) regcache_collect (regno + 2, cr); if (register_cached (regno + 3)) regcache_collect (regno + 3, lr); if (register_cached (regno + 4)) regcache_collect (regno + 4, ctr); if (register_cached (regno + 5)) regcache_collect (regno + 5, xer); } static void fill_sprs32 (unsigned long *iar, unsigned long *msr, unsigned long *cr, unsigned long *lr, unsigned long *ctr, unsigned long *xer) { int regno = FIRST_UISA_SP_REGNUM; /* If this assert() fails, the most likely reason is that GDB was built incorrectly. In order to make use of many of the header files in /usr/include/sys, GDB needs to be configured so that sizeof (long) == 4). */ gdb_assert (sizeof (*iar) == REGISTER_RAW_SIZE (regno)); if (register_cached (regno)) regcache_collect (regno, iar); if (register_cached (regno + 1)) regcache_collect (regno + 1, msr); if (register_cached (regno + 2)) regcache_collect (regno + 2, cr); if (register_cached (regno + 3)) regcache_collect (regno + 3, lr); if (register_cached (regno + 4)) regcache_collect (regno + 4, ctr); if (register_cached (regno + 5)) regcache_collect (regno + 5, xer); } /* Store all registers into pthread PDTID, which doesn't have a kernel thread. It's possible to store a single register into a non-kernel pthread, but I doubt it's worth the effort. */ static void store_regs_user_thread (pthdb_pthread_t pdtid) { int status, i; pthdb_context_t ctx; uint32_t int32; uint64_t int64; double dbl; if (debug_aix_thread) fprintf_unfiltered (gdb_stdlog, "store_regs_user_thread %lx\n", (long) pdtid); /* Retrieve the thread's current context for its non-register values. */ status = pthdb_pthread_context (pd_session, pdtid, &ctx); if (status != PTHDB_SUCCESS) error ("aix-thread: store_registers: pthdb_pthread_context returned %s", pd_status2str (status)); /* Collect general-purpose register values from the regcache. */ for (i = 0; i < 32; i++) if (register_cached (i)) { if (arch64) { regcache_collect (i, (void *) &int64); ctx.gpr[i] = int64; } else { regcache_collect (i, (void *) &int32); ctx.gpr[i] = int32; } } /* Collect floating-point register values from the regcache. */ fill_fprs (ctx.fpr); /* Special registers (always kept in ctx as 64 bits). */ if (arch64) { fill_sprs64 (&ctx.iar, &ctx.msr, &ctx.cr, &ctx.lr, &ctx.ctr, &ctx.xer); } else { /* Problem: ctx.iar etc. are 64 bits, but raw_registers are 32. Solution: use 32-bit temp variables. (The assert() in fill_sprs32() will fail if the size of an unsigned long is incorrect. If this happens, GDB needs to be reconfigured so that longs are 32-bits.) */ unsigned long tmp_iar, tmp_msr, tmp_cr, tmp_lr, tmp_ctr, tmp_xer; fill_sprs32 (&tmp_iar, &tmp_msr, &tmp_cr, &tmp_lr, &tmp_ctr, &tmp_xer); if (register_cached (FIRST_UISA_SP_REGNUM)) ctx.iar = tmp_iar; if (register_cached (FIRST_UISA_SP_REGNUM + 1)) ctx.msr = tmp_msr; if (register_cached (FIRST_UISA_SP_REGNUM + 2)) ctx.cr = tmp_cr; if (register_cached (FIRST_UISA_SP_REGNUM + 3)) ctx.lr = tmp_lr; if (register_cached (FIRST_UISA_SP_REGNUM + 4)) ctx.ctr = tmp_ctr; if (register_cached (FIRST_UISA_SP_REGNUM + 5)) ctx.xer = tmp_xer; } status = pthdb_pthread_setcontext (pd_session, pdtid, &ctx); if (status != PTHDB_SUCCESS) error ("aix-thread: store_registers: pthdb_pthread_setcontext returned %s", pd_status2str (status)); } /* Store register REGNO if != -1 or all registers otherwise into kernel thread TID. AIX provides a way to set all of a kernel thread's GPRs, FPRs, or SPRs, but there's no way to set individual registers within those groups. Therefore, if REGNO != -1, this function stores an entire group. */ static void store_regs_kernel_thread (int regno, pthdb_tid_t tid) { uint64_t gprs64[32]; uint32_t gprs32[32]; double fprs[32]; struct ptxsprs sprs64; struct ptsprs sprs32; int i; if (debug_aix_thread) fprintf_unfiltered (gdb_stdlog, "store_regs_kernel_thread tid=%lx regno=%d\n", (long) tid, regno); /* General-purpose registers. */ if (regno == -1 || regno < FP0_REGNUM) { if (arch64) { /* Pre-fetch: some regs may not be in the cache. */ ptrace64aix (PTT_READ_GPRS, tid, (unsigned long) gprs64, 0, NULL); fill_gprs64 (gprs64); ptrace64aix (PTT_WRITE_GPRS, tid, (unsigned long) gprs64, 0, NULL); } else { /* Pre-fetch: some regs may not be in the cache. */ ptrace32 (PTT_READ_GPRS, tid, gprs32, 0, NULL); fill_gprs32 (gprs32); ptrace32 (PTT_WRITE_GPRS, tid, gprs32, 0, NULL); } } /* Floating-point registers. */ if (regno == -1 || (regno >= FP0_REGNUM && regno <= FPLAST_REGNUM)) { /* Pre-fetch: some regs may not be in the cache. */ ptrace32 (PTT_READ_FPRS, tid, (int *) fprs, 0, NULL); fill_fprs (fprs); ptrace32 (PTT_WRITE_FPRS, tid, (int *) fprs, 0, NULL); } /* Special-purpose registers. */ if (regno == -1 || (regno > FPLAST_REGNUM && regno <= LAST_UISA_SP_REGNUM)) { if (arch64) { /* Pre-fetch: some registers won't be in the cache. */ ptrace64aix (PTT_READ_SPRS, tid, (unsigned long) &sprs64, 0, NULL); fill_sprs64 (&sprs64.pt_iar, &sprs64.pt_msr, &sprs64.pt_cr, &sprs64.pt_lr, &sprs64.pt_ctr, &sprs64.pt_xer); ptrace64aix (PTT_WRITE_SPRS, tid, (unsigned long) &sprs64, 0, NULL); } else { /* Pre-fetch: some registers won't be in the cache. */ ptrace32 (PTT_READ_SPRS, tid, (int *) &sprs32, 0, NULL); fill_sprs32 (&sprs32.pt_iar, &sprs32.pt_msr, &sprs32.pt_cr, &sprs32.pt_lr, &sprs32.pt_ctr, &sprs32.pt_xer); if (REGISTER_RAW_SIZE (LAST_UISA_SP_REGNUM)) if (register_cached (LAST_UISA_SP_REGNUM)) regcache_collect (LAST_UISA_SP_REGNUM, &sprs32.pt_mq); ptrace32 (PTT_WRITE_SPRS, tid, (int *) &sprs32, 0, NULL); } } } /* Store gdb's current view of the register set into the thread/process specified by inferior_ptid. */ static void aix_thread_store_registers (int regno) { struct thread_info *thread; pthdb_tid_t tid; if (!PD_TID (inferior_ptid)) base_target.to_store_registers (regno); else { thread = find_thread_pid (inferior_ptid); tid = thread->private->tid; if (tid == PTHDB_INVALID_TID) store_regs_user_thread (thread->private->pdtid); else store_regs_kernel_thread (regno, tid); } } /* Transfer LEN bytes of memory from GDB address MYADDR to target address MEMADDR if WRITE and vice versa otherwise. */ static int aix_thread_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int write, struct mem_attrib *attrib, struct target_ops *target) { int n; struct cleanup *cleanup = save_inferior_ptid (); inferior_ptid = pid_to_ptid (PIDGET (inferior_ptid)); n = base_target.to_xfer_memory (memaddr, myaddr, len, write, attrib, &base_target); do_cleanups (cleanup); return n; } /* Kill and forget about the inferior process. */ static void aix_thread_kill (void) { struct cleanup *cleanup = save_inferior_ptid (); inferior_ptid = pid_to_ptid (PIDGET (inferior_ptid)); base_target.to_kill (); do_cleanups (cleanup); } /* Clean up after the inferior exits. */ static void aix_thread_mourn_inferior (void) { pd_deactivate (); base_target.to_mourn_inferior (); } /* Return whether thread PID is still valid. */ static int aix_thread_thread_alive (ptid_t ptid) { if (!PD_TID (ptid)) return base_target.to_thread_alive (ptid); /* We update the thread list every time the child stops, so all valid threads should be in the thread list. */ return in_thread_list (ptid); } /* Return a printable representation of composite PID for use in "info threads" output. */ static char * aix_thread_pid_to_str (ptid_t ptid) { static char *ret = NULL; if (!PD_TID (ptid)) return base_target.to_pid_to_str (ptid); /* Free previous return value; a new one will be allocated by xasprintf(). */ xfree (ret); xasprintf (&ret, "Thread %ld", ptid_get_tid (ptid)); return ret; } /* Return a printable representation of extra information about THREAD, for use in "info threads" output. */ static char * aix_thread_extra_thread_info (struct thread_info *thread) { struct ui_file *buf; int status; pthdb_pthread_t pdtid; pthdb_tid_t tid; pthdb_state_t state; pthdb_suspendstate_t suspendstate; pthdb_detachstate_t detachstate; int cancelpend; long length; static char *ret = NULL; if (!PD_TID (thread->ptid)) return NULL; buf = mem_fileopen (); pdtid = thread->private->pdtid; tid = thread->private->tid; if (tid != PTHDB_INVALID_TID) fprintf_unfiltered (buf, "tid %d", tid); status = pthdb_pthread_state (pd_session, pdtid, &state); if (status != PTHDB_SUCCESS) state = PST_NOTSUP; fprintf_unfiltered (buf, ", %s", state2str (state)); status = pthdb_pthread_suspendstate (pd_session, pdtid, &suspendstate); if (status == PTHDB_SUCCESS && suspendstate == PSS_SUSPENDED) fprintf_unfiltered (buf, ", suspended"); status = pthdb_pthread_detachstate (pd_session, pdtid, &detachstate); if (status == PTHDB_SUCCESS && detachstate == PDS_DETACHED) fprintf_unfiltered (buf, ", detached"); pthdb_pthread_cancelpend (pd_session, pdtid, &cancelpend); if (status == PTHDB_SUCCESS && cancelpend) fprintf_unfiltered (buf, ", cancel pending"); ui_file_write (buf, "", 1); xfree (ret); /* Free old buffer. */ ret = ui_file_xstrdup (buf, &length); ui_file_delete (buf); return ret; } /* Initialize target aix_thread_ops. */ static void init_aix_thread_ops (void) { aix_thread_ops.to_shortname = "aix-threads"; aix_thread_ops.to_longname = "AIX pthread support"; aix_thread_ops.to_doc = "AIX pthread support"; aix_thread_ops.to_attach = aix_thread_attach; aix_thread_ops.to_detach = aix_thread_detach; aix_thread_ops.to_resume = aix_thread_resume; aix_thread_ops.to_wait = aix_thread_wait; aix_thread_ops.to_fetch_registers = aix_thread_fetch_registers; aix_thread_ops.to_store_registers = aix_thread_store_registers; aix_thread_ops.to_xfer_memory = aix_thread_xfer_memory; /* No need for aix_thread_ops.to_create_inferior, because we activate thread debugging when the inferior reaches pd_brk_addr. */ aix_thread_ops.to_kill = aix_thread_kill; aix_thread_ops.to_mourn_inferior = aix_thread_mourn_inferior; aix_thread_ops.to_thread_alive = aix_thread_thread_alive; aix_thread_ops.to_pid_to_str = aix_thread_pid_to_str; aix_thread_ops.to_extra_thread_info = aix_thread_extra_thread_info; aix_thread_ops.to_stratum = thread_stratum; aix_thread_ops.to_magic = OPS_MAGIC; } /* Module startup initialization function, automagically called by init.c. */ void _initialize_aix_thread (void) { init_aix_thread_ops (); add_target (&aix_thread_ops); /* Notice when object files get loaded and unloaded. */ target_new_objfile_chain = target_new_objfile_hook; target_new_objfile_hook = new_objfile; add_show_from_set (add_set_cmd ("aix-thread", no_class, var_zinteger, (char *) &debug_aix_thread, "Set debugging of AIX thread module.\n" "Enables printf debugging output.\n", &setdebuglist), &showdebuglist); }