/* Low level interface for debugging HPUX/DCE threads for GDB, the GNU debugger. Copyright 1996 Free Software Foundation, Inc. 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 implements a sort of half target that sits between the machine-independent parts of GDB and the ptrace interface (infptrace.c) to provide access to the HPUX user-mode thread implementation. HPUX threads are true user-mode threads, which are invoked via the cma_* and pthread_* (DCE and Posix respectivly) interfaces. These are mostly implemented in user-space, with all thread context kept in various structures that live in the user's heap. For the most part, the kernel has no knowlege of these threads. */ #include "defs.h" #define _CMA_NOWRAPPERS_ #include <cma_tcb_defs.h> #include <cma_deb_core.h> #include "gdbthread.h" #include "target.h" #include "inferior.h" #include <fcntl.h> #include <unistd.h> #include <sys/stat.h> #include "gdbcore.h" extern struct target_ops hpux_thread_ops; /* Forward declaration */ extern int child_suppress_run; extern struct target_ops child_ops; /* target vector for inftarg.c */ struct string_map { int num; char *str; }; static int hpux_thread_active = 0; static int main_pid; /* Real process ID */ static CORE_ADDR P_cma__g_known_threads; static CORE_ADDR P_cma__g_current_thread; static struct cleanup * save_inferior_pid PARAMS ((void)); static void restore_inferior_pid PARAMS ((int pid)); static void hpux_thread_resume PARAMS ((int pid, int step, enum target_signal signo)); /* LOCAL FUNCTION save_inferior_pid - Save inferior_pid on the cleanup list restore_inferior_pid - Restore inferior_pid from the cleanup list SYNOPSIS struct cleanup *save_inferior_pid () void restore_inferior_pid (int pid) DESCRIPTION These two functions act in unison to restore inferior_pid in case of an error. NOTES inferior_pid is a global variable that needs to be changed by many of these routines before calling functions in procfs.c. In order to guarantee that inferior_pid gets restored (in case of errors), you need to call save_inferior_pid before changing it. At the end of the function, you should invoke do_cleanups to restore it. */ static struct cleanup * save_inferior_pid () { return make_cleanup (restore_inferior_pid, inferior_pid); } static void restore_inferior_pid (pid) int pid; { inferior_pid = pid; } static int find_active_thread PARAMS ((void)); static int cached_thread; static int cached_active_thread; static cma__t_int_tcb cached_tcb; static int find_active_thread () { static cma__t_int_tcb tcb; CORE_ADDR tcb_ptr; if (cached_active_thread != 0) return cached_active_thread; read_memory ((CORE_ADDR)P_cma__g_current_thread, (char *)&tcb_ptr, sizeof tcb_ptr); read_memory (tcb_ptr, (char *)&tcb, sizeof tcb); return (cma_thread_get_unique (&tcb.prolog.client_thread) << 16) | main_pid; } static cma__t_int_tcb * find_tcb PARAMS ((int thread)); static cma__t_int_tcb * find_tcb (thread) int thread; { cma__t_known_object queue_header; cma__t_queue *queue_ptr; if (thread == cached_thread) return &cached_tcb; read_memory ((CORE_ADDR)P_cma__g_known_threads, (char *)&queue_header, sizeof queue_header); for (queue_ptr = queue_header.queue.flink; queue_ptr != (cma__t_queue *)P_cma__g_known_threads; queue_ptr = cached_tcb.threads.flink) { cma__t_int_tcb *tcb_ptr; tcb_ptr = cma__base (queue_ptr, threads, cma__t_int_tcb); read_memory ((CORE_ADDR)tcb_ptr, (char *)&cached_tcb, sizeof cached_tcb); if (cached_tcb.header.type == cma__c_obj_tcb) if (cma_thread_get_unique (&cached_tcb.prolog.client_thread) == thread >> 16) { cached_thread = thread; return &cached_tcb; } } error ("Can't find TCB %d,%d", thread >> 16, thread & 0xffff); return NULL; } /* Most target vector functions from here on actually just pass through to inftarg.c, as they don't need to do anything specific for threads. */ /* ARGSUSED */ static void hpux_thread_open (arg, from_tty) char *arg; int from_tty; { child_ops.to_open (arg, from_tty); } /* Attach to process PID, then initialize for debugging it and wait for the trace-trap that results from attaching. */ static void hpux_thread_attach (args, from_tty) char *args; int from_tty; { child_ops.to_attach (args, from_tty); /* XXX - might want to iterate over all the threads and register them. */ } /* Take a program previously attached to and detaches it. The program resumes execution and will no longer stop on signals, etc. We'd better not have left any breakpoints in the program or it'll die when it hits one. For this to work, it may be necessary for the process to have been previously attached. It *might* work if the program was started via the normal ptrace (PTRACE_TRACEME). */ static void hpux_thread_detach (args, from_tty) char *args; int from_tty; { child_ops.to_detach (args, from_tty); } /* Resume execution of process PID. If STEP is nozero, then just single step it. If SIGNAL is nonzero, restart it with that signal activated. We may have to convert pid from a thread-id to an LWP id for procfs. */ static void hpux_thread_resume (pid, step, signo) int pid; int step; enum target_signal signo; { struct cleanup *old_chain; old_chain = save_inferior_pid (); pid = inferior_pid = main_pid; #if 0 if (pid != -1) { pid = thread_to_lwp (pid, -2); if (pid == -2) /* Inactive thread */ error ("This version of Solaris can't start inactive threads."); } #endif child_ops.to_resume (pid, step, signo); cached_thread = 0; cached_active_thread = 0; do_cleanups (old_chain); } /* Wait for any threads to stop. We may have to convert PID from a thread id to a LWP id, and vice versa on the way out. */ static int hpux_thread_wait (pid, ourstatus) int pid; struct target_waitstatus *ourstatus; { int rtnval; struct cleanup *old_chain; old_chain = save_inferior_pid (); inferior_pid = main_pid; if (pid != -1) pid = main_pid; rtnval = child_ops.to_wait (pid, ourstatus); rtnval = find_active_thread (); do_cleanups (old_chain); return rtnval; } static char regmap[NUM_REGS] = { -2, -1, -1, 0, 4, 8, 12, 16, 20, 24, /* flags, r1 -> r9 */ 28, 32, 36, 40, 44, 48, 52, 56, 60, -1, /* r10 -> r19 */ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* r20 -> r29 */ /* r30, r31, sar, pcoqh, pcsqh, pcoqt, pcsqt, eiem, iir, isr */ -2, -1, -1, -2, -1, -1, -1, -1, -1, -1, /* ior, ipsw, goto, sr4, sr0, sr1, sr2, sr3, sr5, sr6 */ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* sr7, cr0, cr8, cr9, ccr, cr12, cr13, cr24, cr25, cr26 */ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* mpsfu_high, mpsfu_low, mpsfu_ovflo, pad */ 144, -1, -1, -1, -1, -1, -1, -1, /* fpsr, fpe1 -> fpe7 */ -1, -1, -1, -1, -1, -1, -1, -1, /* fr4 -> fr7 */ -1, -1, -1, -1, -1, -1, -1, -1, /* fr8 -> fr11 */ 136, -1, 128, -1, 120, -1, 112, -1, /* fr12 -> fr15 */ 104, -1, 96, -1, 88, -1, 80, -1, /* fr16 -> fr19 */ 72, -1, 64, -1, -1, -1, -1, -1, /* fr20 -> fr23 */ -1, -1, -1, -1, -1, -1, -1, -1, /* fr24 -> fr27 */ -1, -1, -1, -1, -1, -1, -1, -1, /* fr28 -> fr31 */ }; static void hpux_thread_fetch_registers (regno) int regno; { cma__t_int_tcb tcb, *tcb_ptr; struct cleanup *old_chain; int i; int first_regno, last_regno; tcb_ptr = find_tcb (inferior_pid); old_chain = save_inferior_pid (); inferior_pid = main_pid; if (tcb_ptr->state == cma__c_state_running) { child_ops.to_fetch_registers (regno); do_cleanups (old_chain); return; } if (regno == -1) { first_regno = 0; last_regno = NUM_REGS - 1; } else { first_regno = regno; last_regno = regno; } for (regno = first_regno; regno <= last_regno; regno++) { if (regmap[regno] == -1) child_ops.to_fetch_registers (regno); else { unsigned char buf[MAX_REGISTER_RAW_SIZE]; CORE_ADDR sp; sp = (CORE_ADDR)tcb_ptr->static_ctx.sp - 160; if (regno == FLAGS_REGNUM) /* Flags must be 0 to avoid bogus value for SS_INSYSCALL */ memset (buf, '\000', REGISTER_RAW_SIZE (regno)); else if (regno == SP_REGNUM) store_address (buf, sizeof sp, sp); else if (regno == PC_REGNUM) read_memory (sp - 20, buf, REGISTER_RAW_SIZE (regno)); else read_memory (sp + regmap[regno], buf, REGISTER_RAW_SIZE (regno)); supply_register (regno, buf); } } do_cleanups (old_chain); } static void hpux_thread_store_registers (regno) int regno; { cma__t_int_tcb tcb, *tcb_ptr; struct cleanup *old_chain; int i; int first_regno, last_regno; tcb_ptr = find_tcb (inferior_pid); old_chain = save_inferior_pid (); inferior_pid = main_pid; if (tcb_ptr->state == cma__c_state_running) { child_ops.to_store_registers (regno); do_cleanups (old_chain); return; } if (regno == -1) { first_regno = 0; last_regno = NUM_REGS - 1; } else { first_regno = regno; last_regno = regno; } for (regno = first_regno; regno <= last_regno; regno++) { if (regmap[regno] == -1) child_ops.to_store_registers (regno); else { unsigned char buf[MAX_REGISTER_RAW_SIZE]; CORE_ADDR sp; sp = (CORE_ADDR)tcb_ptr->static_ctx.sp - 160; if (regno == FLAGS_REGNUM) child_ops.to_store_registers (regno); /* Let lower layer handle this... */ else if (regno == SP_REGNUM) { write_memory ((CORE_ADDR)&tcb_ptr->static_ctx.sp, registers + REGISTER_BYTE (regno), REGISTER_RAW_SIZE (regno)); tcb_ptr->static_ctx.sp = (cma__t_hppa_regs *) (extract_address (registers + REGISTER_BYTE (regno), REGISTER_RAW_SIZE (regno)) + 160); } else if (regno == PC_REGNUM) write_memory (sp - 20, registers + REGISTER_BYTE (regno), REGISTER_RAW_SIZE (regno)); else write_memory (sp + regmap[regno], registers + REGISTER_BYTE (regno), REGISTER_RAW_SIZE (regno)); } } do_cleanups (old_chain); } /* Get ready to modify the registers array. On machines which store individual registers, this doesn't need to do anything. On machines which store all the registers in one fell swoop, this makes sure that registers contains all the registers from the program being debugged. */ static void hpux_thread_prepare_to_store () { child_ops.to_prepare_to_store (); } static int hpux_thread_xfer_memory (memaddr, myaddr, len, dowrite, target) CORE_ADDR memaddr; char *myaddr; int len; int dowrite; struct target_ops *target; /* ignored */ { int retval; struct cleanup *old_chain; old_chain = save_inferior_pid (); inferior_pid = main_pid; retval = child_ops.to_xfer_memory (memaddr, myaddr, len, dowrite, target); do_cleanups (old_chain); return retval; } /* Print status information about what we're accessing. */ static void hpux_thread_files_info (ignore) struct target_ops *ignore; { child_ops.to_files_info (ignore); } static void hpux_thread_kill_inferior () { child_ops.to_kill (); } static void hpux_thread_notice_signals (pid) int pid; { child_ops.to_notice_signals (pid); } /* Fork an inferior process, and start debugging it with /proc. */ static void hpux_thread_create_inferior (exec_file, allargs, env) char *exec_file; char *allargs; char **env; { child_ops.to_create_inferior (exec_file, allargs, env); if (hpux_thread_active) { main_pid = inferior_pid; push_target (&hpux_thread_ops); inferior_pid = find_active_thread (); add_thread (inferior_pid); } } /* This routine is called whenever a new symbol table is read in, or when all symbol tables are removed. libthread_db can only be initialized when it finds the right variables in libthread.so. Since it's a shared library, those variables don't show up until the library gets mapped and the symbol table is read in. */ void hpux_thread_new_objfile (objfile) struct objfile *objfile; { struct minimal_symbol *ms; if (!objfile) { hpux_thread_active = 0; return; } ms = lookup_minimal_symbol ("cma__g_known_threads", NULL, objfile); if (!ms) return; P_cma__g_known_threads = SYMBOL_VALUE_ADDRESS (ms); ms = lookup_minimal_symbol ("cma__g_current_thread", NULL, objfile); if (!ms) return; P_cma__g_current_thread = SYMBOL_VALUE_ADDRESS (ms); hpux_thread_active = 1; } /* Clean up after the inferior dies. */ static void hpux_thread_mourn_inferior () { child_ops.to_mourn_inferior (); } /* Mark our target-struct as eligible for stray "run" and "attach" commands. */ static int hpux_thread_can_run () { return child_suppress_run; } static int hpux_thread_alive (pid) int pid; { return 1; } static void hpux_thread_stop () { child_ops.to_stop (); } /* Convert a pid to printable form. */ char * hpux_pid_to_str (pid) int pid; { static char buf[100]; sprintf (buf, "Thread %d", pid >> 16); return buf; } struct target_ops hpux_thread_ops = { "hpux-threads", /* to_shortname */ "HPUX threads and pthread.", /* to_longname */ "HPUX threads and pthread support.", /* to_doc */ hpux_thread_open, /* to_open */ 0, /* to_close */ hpux_thread_attach, /* to_attach */ hpux_thread_detach, /* to_detach */ hpux_thread_resume, /* to_resume */ hpux_thread_wait, /* to_wait */ hpux_thread_fetch_registers, /* to_fetch_registers */ hpux_thread_store_registers, /* to_store_registers */ hpux_thread_prepare_to_store, /* to_prepare_to_store */ hpux_thread_xfer_memory, /* to_xfer_memory */ hpux_thread_files_info, /* to_files_info */ memory_insert_breakpoint, /* to_insert_breakpoint */ memory_remove_breakpoint, /* to_remove_breakpoint */ terminal_init_inferior, /* to_terminal_init */ terminal_inferior, /* to_terminal_inferior */ terminal_ours_for_output, /* to_terminal_ours_for_output */ terminal_ours, /* to_terminal_ours */ child_terminal_info, /* to_terminal_info */ hpux_thread_kill_inferior, /* to_kill */ 0, /* to_load */ 0, /* to_lookup_symbol */ hpux_thread_create_inferior, /* to_create_inferior */ hpux_thread_mourn_inferior, /* to_mourn_inferior */ hpux_thread_can_run, /* to_can_run */ hpux_thread_notice_signals, /* to_notice_signals */ hpux_thread_alive, /* to_thread_alive */ hpux_thread_stop, /* to_stop */ process_stratum, /* to_stratum */ 0, /* to_next */ 1, /* to_has_all_memory */ 1, /* to_has_memory */ 1, /* to_has_stack */ 1, /* to_has_registers */ 1, /* to_has_execution */ 0, /* sections */ 0, /* sections_end */ OPS_MAGIC /* to_magic */ }; void _initialize_hpux_thread () { add_target (&hpux_thread_ops); child_suppress_run = 1; }