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Diffstat (limited to 'gdb/m3-nat.c')
| -rw-r--r-- | gdb/m3-nat.c | 4318 |
1 files changed, 4318 insertions, 0 deletions
diff --git a/gdb/m3-nat.c b/gdb/m3-nat.c index e69de29..348b363 100644 --- a/gdb/m3-nat.c +++ b/gdb/m3-nat.c @@ -0,0 +1,4318 @@ +/* Interface GDB to Mach 3.0 operating systems. + (Most) Mach 3.0 related routines live in this file. + + Copyright (C) 1992 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., 675 Mass Ave, Cambridge, MA 02139, USA. */ + +/* + * Author: Jukka Virtanen <jtv@hut.fi> + * Computing Centre + * Helsinki University of Technology + * Finland + * + * Thanks to my friends who helped with ideas and testing: + * + * Johannes Helander, Antti Louko, Tero Mononen, + * jvh@cs.hut.fi alo@hut.fi tmo@cs.hut.fi + * + * Tero Kivinen and Eamonn McManus + * kivinen@cs.hut.fi emcmanus@gr.osf.org + * + */ + +#include <stdio.h> + +#include <mach.h> +#include <servers/netname.h> +#include <servers/machid.h> +#include <mach/message.h> +#include <mach/notify.h> +#include <mach_error.h> +#include <mach/exception.h> +#include <mach/vm_attributes.h> + +#include "defs.h" +#include "inferior.h" +#include "symtab.h" +#include "value.h" +#include "language.h" +#include "target.h" +#include "wait.h" +#include "gdbcmd.h" +#include "gdb-threads.h" + +#include <servers/machid_lib.h> + +/* Included only for signal names and NSIG + * + * note: There are many problems in signal handling with + * gdb in Mach 3.0 in general. + */ +#include <signal.h> +#define SIG_UNKNOWN 0 /* Exception that has no matching unix signal */ + +#define private static + +/* + * Actions for Mach exceptions. + * + * sigmap field maps the exception to corresponding Unix signal. + * + * I do not know how to map the exception to unix signal + * if SIG_UNKNOWN is specified. + */ + +struct exception_list { + char *name; + boolean_t forward; + boolean_t print; + int sigmap; +} exception_map[] = { + {"not_mach3_exception", FALSE, TRUE, SIG_UNKNOWN}, + {"EXC_BAD_ACCESS", FALSE, TRUE, SIGSEGV}, + {"EXC_BAD_INSTRUCTION", FALSE, TRUE, SIGILL}, + {"EXC_ARITHMETIC", FALSE, TRUE, SIGFPE}, + {"EXC_EMULATION", FALSE, TRUE, SIGEMT}, /* ??? */ + {"EXC_SOFTWARE", FALSE, TRUE, SIG_UNKNOWN}, + {"EXC_BREAKPOINT", FALSE, FALSE, SIGTRAP} +}; + +/* Mach exception table size */ +int max_exception = sizeof(exception_map)/sizeof(struct exception_list) - 1; + +#define MAX_EXCEPTION max_exception + +WAITTYPE wait_status; + +/* If you define this, intercepted bsd server calls will be + * dumped while waiting the inferior to EXEC the correct + * program + */ +/* #define DUMP_SYSCALL /* debugging interceptor */ + +/* xx_debug() outputs messages if this is nonzero. + * If > 1, DUMP_SYSCALL will dump message contents. + */ +int debug_level = 0; + +/* "Temporary" debug stuff */ +void +xx_debug (fmt, a,b,c) +char *fmt; +int a,b,c; +{ + if (debug_level) + message (fmt, a, b, c); +} + +/* This is in libmach.a */ +extern mach_port_t name_server_port; + +/* Set in catch_exception_raise */ +int stop_exception, stop_code, stop_subcode; +int stopped_in_exception; + +/* Thread that was the active thread when we stopped */ +thread_t stop_thread = MACH_PORT_NULL; + +char *hostname = ""; + +/* Set when task is attached or created */ +boolean_t emulator_present = FALSE; + +task_t inferior_task; +thread_t current_thread; + +/* Exception ports for inferior task */ +mach_port_t inferior_exception_port = MACH_PORT_NULL; +mach_port_t inferior_old_exception_port = MACH_PORT_NULL; + +/* task exceptions and notifications */ +mach_port_t inferior_wait_port_set = MACH_PORT_NULL; +mach_port_t our_notify_port = MACH_PORT_NULL; + +/* This is "inferior_wait_port_set" when not single stepping, and + * "singlestepped_thread_port" when we are single stepping. + * + * This is protected by a cleanup function: discard_single_step() + */ +mach_port_t currently_waiting_for = MACH_PORT_NULL; + +/* A port for external messages to gdb. + * External in the meaning that they do not come + * from the inferior_task, but rather from external + * tasks. + * + * As a debugging feature: + * A debugger debugging another debugger can stop the + * inferior debugger by the following command sequence + * (without running external programs) + * + * (top-gdb) set stop_inferior_gdb () + * (top-gdb) continue + */ +mach_port_t our_message_port = MACH_PORT_NULL; + +/* For single stepping */ +mach_port_t thread_exception_port = MACH_PORT_NULL; +mach_port_t thread_saved_exception_port = MACH_PORT_NULL; +mach_port_t singlestepped_thread_port = MACH_PORT_NULL; + +/* For machid calls */ +mach_port_t mid_server = MACH_PORT_NULL; +mach_port_t mid_auth = MACH_PORT_NULL; + +/* If gdb thinks the inferior task is not suspended, it + * must take suspend/abort the threads when it reads the state. + */ +int must_suspend_thread = 0; + +/* When single stepping, we switch the port that mach_really_wait() listens to. + * This cleanup is a guard to prevent the port set from being left to + * the singlestepped_thread_port when error() is called. + * This is nonzero only when we are single stepping. + */ +#define NULL_CLEANUP (struct cleanup *)0 +struct cleanup *cleanup_step = NULL_CLEANUP; + + +#if 0 +#define MACH_TYPE_EXCEPTION_PORT -1 +#endif + +/* Chain of ports to remember requested notifications. */ + +struct port_chain { + struct port_chain *next; + mach_port_t port; + int type; + int mid; /* Now only valid with MACH_TYPE_THREAD and */ + /* MACH_TYPE_THREAD */ +}; +typedef struct port_chain *port_chain_t; + +/* Room for chain nodes comes from pchain_obstack */ +struct obstack pchain_obstack; +struct obstack *port_chain_obstack = &pchain_obstack; + +/* For thread handling */ +struct obstack Cproc_obstack; +struct obstack *cproc_obstack = &Cproc_obstack; + +/* the list of notified ports */ +port_chain_t notify_chain = (port_chain_t) NULL; + +port_chain_t +port_chain_insert (list, name, type) + port_chain_t list; + mach_port_t name; + int type; +{ + kern_return_t ret; + port_chain_t new; + int mid; + + if (! MACH_PORT_VALID (name)) + return list; + + if (type == MACH_TYPE_TASK || type == MACH_TYPE_THREAD) + { + if (! MACH_PORT_VALID (mid_server)) + { + message ("Machid server port invalid, can not map port 0x%x to MID", + name); + mid = name; + } + else + { + ret = machid_mach_register (mid_server, mid_auth, name, type, &mid); + + if (ret != KERN_SUCCESS) + { + message ("Can not map name (0x%x) to MID with machid", name); + mid = name; + } + } + } + else + mid = 3735928559; /* 0x? :-) */ + + new = (port_chain_t) obstack_alloc (port_chain_obstack, + sizeof (struct port_chain)); + new->next = list; + new->port = name; + new->type = type; + new->mid = mid; + + return new; +} + +port_chain_t +port_chain_delete (list, elem) + port_chain_t list; + mach_port_t elem; +{ + if (list) + if (list->port == elem) + list = list->next; + else + while (list->next) + { + if (list->next->port == elem) + list->next = list->next->next; /* GCd with obstack_free() */ + else + list = list->next; + } + return list; +} + +void +port_chain_destroy (ostack) + struct obstack *ostack; +{ + obstack_free (ostack, 0); + obstack_init (ostack); +} + +port_chain_t +port_chain_member (list, elem) + port_chain_t list; + mach_port_t elem; +{ + while (list) + { + if (list->port == elem) + return list; + list = list->next; + } + return (port_chain_t) NULL; +} + +int +map_port_name_to_mid (name, type) +mach_port_t name; +int type; +{ + port_chain_t elem; + + if (!MACH_PORT_VALID (name)) + return -1; + + elem = port_chain_member (notify_chain, name); + + if (elem && (elem->type == type)) + return elem->mid; + + if (elem) + return -1; + + if (! MACH_PORT_VALID (mid_server)) + { + message ("Machid server port invalid, can not map port 0x%x to mid", + name); + return -1; + } + else + { + int mid; + kern_return_t ret; + + ret = machid_mach_register (mid_server, mid_auth, name, type, &mid); + + if (ret != KERN_SUCCESS) + { + message ("Can not map name (0x%x) to mid with machid", name); + return -1; + } + return mid; + } +} + +/* Guard for currently_waiting_for and singlestepped_thread_port */ +private void +discard_single_step (thread) + thread_t thread; +{ + currently_waiting_for = inferior_wait_port_set; + + cleanup_step = NULL_CLEANUP; + if (MACH_PORT_VALID (thread) && MACH_PORT_VALID (singlestepped_thread_port)) + setup_single_step (thread, FALSE); +} + +setup_single_step (thread, start_step) + thread_t thread; + boolean_t start_step; +{ + kern_return_t ret; + + if (! MACH_PORT_VALID (thread)) + error ("Invalid thread supplied to setup_single_step"); + else + { + mach_port_t teport; + + /* Get the current thread exception port */ + ret = thread_get_exception_port (thread, &teport); + CHK ("Getting thread's exception port", ret); + + if (start_step) + { + if (MACH_PORT_VALID (singlestepped_thread_port)) + { + message ("Singlestepped_thread_port (0x%x) is still valid?", + singlestepped_thread_port); + singlestepped_thread_port = MACH_PORT_NULL; + } + + /* If we are already stepping this thread */ + if (MACH_PORT_VALID (teport) && teport == thread_exception_port) + { + ret = mach_port_deallocate (mach_task_self (), teport); + CHK ("Could not deallocate thread exception port", ret); + } + else + { + ret = thread_set_exception_port (thread, thread_exception_port); + CHK ("Setting exception port for thread", ret); +#if 0 + /* Insert thread exception port to wait port set */ + ret = mach_port_move_member (mach_task_self(), + thread_exception_port, + inferior_wait_port_set); + CHK ("Moving thread exception port to inferior_wait_port_set", + ret); +#endif + thread_saved_exception_port = teport; + } + + thread_trace (thread, TRUE); + + singlestepped_thread_port = thread_exception_port; + currently_waiting_for = singlestepped_thread_port; + cleanup_step = make_cleanup (discard_single_step, thread); + } + else + { + if (! MACH_PORT_VALID (teport)) + error ("Single stepped thread had an invalid exception port?"); + + if (teport != thread_exception_port) + error ("Single stepped thread had an unknown exception port?"); + + ret = mach_port_deallocate (mach_task_self (), teport); + CHK ("Couldn't deallocate thread exception port", ret); +#if 0 + /* Remove thread exception port from wait port set */ + ret = mach_port_move_member (mach_task_self(), + thread_exception_port, + MACH_PORT_NULL); + CHK ("Removing thread exception port from inferior_wait_port_set", + ret); +#endif + /* Restore thread's old exception port */ + ret = thread_set_exception_port (thread, + thread_saved_exception_port); + CHK ("Restoring stepped thread's exception port", ret); + + if (MACH_PORT_VALID (thread_saved_exception_port)) + (void) mach_port_deallocate (mach_task_self (), + thread_saved_exception_port); + + thread_trace (thread, FALSE); + + singlestepped_thread_port = MACH_PORT_NULL; + currently_waiting_for = inferior_wait_port_set; + if (cleanup_step) + discard_cleanups (cleanup_step); + } + } +} + +private +request_notify (name, variant, type) + mach_port_t name; + mach_msg_id_t variant; + int type; +{ + kern_return_t ret; + mach_port_t previous_port_dummy = MACH_PORT_NULL; + + if (! MACH_PORT_VALID (name)) + return; + + if (port_chain_member (notify_chain, name)) + return; + + ret = mach_port_request_notification (mach_task_self(), + name, + variant, + 1, + our_notify_port, + MACH_MSG_TYPE_MAKE_SEND_ONCE, + &previous_port_dummy); + CHK ("Serious: request_notify failed", ret); + + (void) mach_port_deallocate (mach_task_self (), + previous_port_dummy); + + notify_chain = port_chain_insert (notify_chain, name, type); +} + +reverse_msg_bits(msgp, type) + mach_msg_header_t *msgp; + int type; +{ + int rbits,lbits; + rbits = MACH_MSGH_BITS_REMOTE(msgp->msgh_bits); + lbits = type; + msgp->msgh_bits = + (msgp->msgh_bits & ~MACH_MSGH_BITS_PORTS_MASK) | + MACH_MSGH_BITS(lbits,rbits); +} + +/* On the third day He said: + + Let this be global + and then it was global. + + When creating the inferior fork, the + child code in inflow.c sets the name of the + bootstrap_port in its address space to this + variable. + + The name is transferred to our address space + with mach3_read_inferior(). + + Thou shalt not do this with + task_get_bootstrap_port() in this task, since + the name in the inferior task is different than + the one we get. + + For blessed are the meek, as they shall inherit + the address space. + */ +mach_port_t original_server_port_name = MACH_PORT_NULL; + + +/* Called from inferior after FORK but before EXEC */ +prepare_inferior_task () +{ + kern_return_t ret; + + /* Get the NAME of the bootstrap port in this task + so that GDB can read it */ + ret = task_get_bootstrap_port (mach_task_self (), + &original_server_port_name); + if (ret != KERN_SUCCESS) + abort (); + ret = mach_port_deallocate (mach_task_self (), + original_server_port_name); + if (ret != KERN_SUCCESS) + abort (); + + /* Suspend this task to let the parent change my ports. + Resumed by the debugger */ + ret = task_suspend (mach_task_self ()); + if (ret != KERN_SUCCESS) + abort (); +} + +/* + * Intercept system calls to Unix server. + * After EXEC_COUNTER calls to exec(), return. + * + * Pre-assertion: Child is suspended. (Not verified) + * Post-condition: Child is suspended after EXEC_COUNTER exec() calls. + */ + +void +intercept_exec_calls (exec_counter) + int exec_counter; +{ + struct syscall_msg_t { + mach_msg_header_t header; + mach_msg_type_t type; + char room[ 2000 ]; /* Enuff space */ + }; + + struct syscall_msg_t syscall_in, syscall_out; + + mach_port_t fake_server; + mach_port_t original_server_send; + mach_port_t original_exec_reply; + mach_port_t exec_reply; + mach_port_t exec_reply_send; + mach_msg_type_name_t acquired; + mach_port_t emulator_server_port_name; + struct task_basic_info info; + mach_msg_type_number_t info_count; + + kern_return_t ret; + + if (exec_counter <= 0) + return; /* We are already set up in the correct program */ + + ret = mach_port_allocate(mach_task_self(), + MACH_PORT_RIGHT_RECEIVE, + &fake_server); + CHK("create inferior_fake_server port failed", ret); + + /* Wait for inferior_task to suspend itself */ + while(1) + { + info_count = sizeof (info); + ret = task_info (inferior_task, + TASK_BASIC_INFO, + (task_info_t)&info, + &info_count); + CHK ("Task info", ret); + + if (info.suspend_count) + break; + + /* Note that the definition of the parameter was undefined + * at the time of this writing, so I just use an `ad hoc' value. + */ + (void) swtch_pri (42); /* Universal Priority Value */ + } + + /* Read the inferior's bootstrap port name */ + if (!mach3_read_inferior (&original_server_port_name, + &original_server_port_name, + sizeof (original_server_port_name))) + error ("Can't read inferior task bootstrap port name"); + + /* @@ BUG: If more than 1 send right GDB will FAIL!!! */ + /* Should get refs, and set them back when restoring */ + /* Steal the original bsd server send right from inferior */ + ret = mach_port_extract_right (inferior_task, + original_server_port_name, + MACH_MSG_TYPE_MOVE_SEND, + &original_server_send, + &acquired); + CHK("mach_port_extract_right (bsd server send)",ret); + + if (acquired != MACH_MSG_TYPE_PORT_SEND) + error("Incorrect right extracted, send right to bsd server excpected"); + + ret = mach_port_insert_right (inferior_task, + original_server_port_name, + fake_server, + MACH_MSG_TYPE_MAKE_SEND); + CHK("mach_port_insert_right (fake server send)",ret); + + xx_debug ("inferior task bsd server ports set up \nfs %x, ospn %x, oss %x\n", + fake_server, + original_server_port_name, original_server_send); + + /* A receive right to the reply generated by unix server exec() request */ + ret = mach_port_allocate(mach_task_self(), + MACH_PORT_RIGHT_RECEIVE, + &exec_reply); + CHK("create intercepted_reply_port port failed", ret); + + /* Pass this send right to Unix server so it replies to us after exec() */ + ret = mach_port_extract_right (mach_task_self (), + exec_reply, + MACH_MSG_TYPE_MAKE_SEND_ONCE, + &exec_reply_send, + &acquired); + CHK("mach_port_extract_right (exec_reply)",ret); + + if (acquired != MACH_MSG_TYPE_PORT_SEND_ONCE) + error("Incorrect right extracted, send once excpected for exec reply"); + + ret = mach_port_move_member(mach_task_self(), + fake_server, + inferior_wait_port_set); + CHK ("Moving fake syscall port to inferior_wait_port_set", ret); + + xx_debug ("syscall fake server set up, resuming inferior\n"); + + ret = task_resume (inferior_task); + CHK("task_resume (startup)", ret); + + /* Read requests from the inferior. + Pass directly through everything else except exec() calls. + */ + while(exec_counter > 0) + { + ret = mach_msg (&syscall_in.header, /* header */ + MACH_RCV_MSG, /* options */ + 0, /* send size */ + sizeof (struct syscall_msg_t), /* receive size */ + inferior_wait_port_set, /* receive_name */ + MACH_MSG_TIMEOUT_NONE, + MACH_PORT_NULL); + CHK("mach_msg (intercepted sycall)", ret); + +#ifdef DUMP_SYSCALL + print_msg (&syscall_in.header); +#endif + + /* ASSERT : msgh_local_port == fake_server */ + + if (notify_server (&syscall_in.header, &syscall_out.header)) + error ("received a notify while intercepting syscalls"); + + if (syscall_in.header.msgh_id == MIG_EXEC_SYSCALL_ID) + { + xx_debug ("Received EXEC SYSCALL, counter = %d\n", exec_counter); + if (exec_counter == 1) + { + original_exec_reply = syscall_in.header.msgh_remote_port; + syscall_in.header.msgh_remote_port = exec_reply_send; + } + exec_counter--; + } + + syscall_in.header.msgh_local_port = syscall_in.header.msgh_remote_port; + syscall_in.header.msgh_remote_port = original_server_send; + + reverse_msg_bits(&syscall_in.header, MACH_MSG_TYPE_COPY_SEND); + + ret = mach_msg_send (&syscall_in.header); + CHK ("Forwarded syscall", ret); + } + + ret = mach_port_move_member(mach_task_self(), + fake_server, + MACH_PORT_NULL); + CHK ("Moving fake syscall out of inferior_wait_port_set", ret); + + ret = mach_port_move_member(mach_task_self(), + exec_reply, + inferior_wait_port_set); + CHK ("Moving exec_reply to inferior_wait_port_set", ret); + + ret = mach_msg (&syscall_in.header, /* header */ + MACH_RCV_MSG, /* options */ + 0, /* send size */ + sizeof (struct syscall_msg_t), /* receive size */ + inferior_wait_port_set, /* receive_name */ + MACH_MSG_TIMEOUT_NONE, + MACH_PORT_NULL); + CHK("mach_msg (exec reply)", ret); + + ret = task_suspend (inferior_task); + CHK ("Suspending inferior after last exec", ret); + + must_suspend_thread = 0; + + xx_debug ("Received exec reply from bsd server, suspended inferior task\n"); + +#ifdef DUMP_SYSCALL + print_msg (&syscall_in.header); +#endif + + /* Message should appear as if it came from the unix server */ + syscall_in.header.msgh_local_port = MACH_PORT_NULL; + + /* and go to the inferior task original reply port */ + syscall_in.header.msgh_remote_port = original_exec_reply; + + reverse_msg_bits(&syscall_in.header, MACH_MSG_TYPE_MOVE_SEND_ONCE); + + ret = mach_msg_send (&syscall_in.header); + CHK ("Forwarding exec reply to inferior", ret); + + /* Garbage collect */ + ret = mach_port_deallocate (inferior_task, + original_server_port_name); + CHK ("deallocating fake server send right", ret); + + ret = mach_port_insert_right (inferior_task, + original_server_port_name, + original_server_send, + MACH_MSG_TYPE_MOVE_SEND); + CHK ("Restoring the original bsd server send right", ret); + + ret = mach_port_destroy (mach_task_self (), + fake_server); + fake_server = MACH_PORT_DEAD; + CHK("mach_port_destroy (fake_server)", ret); + + ret = mach_port_destroy (mach_task_self (), + exec_reply); + exec_reply = MACH_PORT_DEAD; + CHK("mach_port_destroy (exec_reply)", ret); + + xx_debug ("Done with exec call interception\n"); +} + +void +consume_send_rights (thread_list, thread_count) + thread_array_t thread_list; + int thread_count; +{ + int index; + + if (!thread_count) + return; + + for (index = 0; index < thread_count; index++) + { + /* Since thread kill command kills threads, don't check ret */ + (void) mach_port_deallocate (mach_task_self (), + thread_list [ index ]); + } +} + +/* suspend/abort/resume a thread. */ +setup_thread (thread, what) + mach_port_t thread; + int what; +{ + kern_return_t ret; + + if (what) + { + ret = thread_suspend (thread); + CHK ("setup_thread thread_suspend", ret); + + ret = thread_abort (thread); + CHK ("setup_thread thread_abort", ret); + } + else + { + ret = thread_resume (thread); + CHK ("setup_thread thread_resume", ret); + } +} + +int +map_slot_to_mid (slot, threads, thread_count) + int slot; + thread_array_t threads; + int thread_count; +{ + kern_return_t ret; + int deallocate = 0; + int index; + int mid; + + if (! threads) + { + deallocate++; + ret = task_threads (inferior_task, &threads, &thread_count); + CHK ("Can not select a thread from a dead task", ret); + } + + if (slot < 0 || slot >= thread_count) + { + if (deallocate) + { + consume_send_rights (threads, thread_count); + (void) vm_deallocate (mach_task_self(), (vm_address_t)threads, + (thread_count * sizeof(mach_port_t))); + } + if (slot < 0) + error ("invalid slot number"); + else + return -(slot+1); + } + + mid = map_port_name_to_mid (threads [slot], MACH_TYPE_THREAD); + + if (deallocate) + { + consume_send_rights (threads, thread_count); + (void) vm_deallocate (mach_task_self(), (vm_address_t)threads, + (thread_count * sizeof(mach_port_t))); + } + + return mid; +} + +private int +parse_thread_id (arg, thread_count, slots) + char *arg; + int thread_count; + int slots; +{ + kern_return_t ret; + int mid; + int slot; + int index; + + if (arg == 0) + return 0; + + while (*arg && (*arg == ' ' || *arg == '\t')) + arg++; + + if (! *arg) + return 0; + + /* Currently parse MID and @SLOTNUMBER */ + if (*arg != '@') + { + mid = atoi (arg); + if (mid <= 0) + error ("valid thread mid expected"); + return mid; + } + + arg++; + slot = atoi (arg); + + if (slot < 0) + error ("invalid slot number"); + + /* If you want slot numbers to remain slot numbers, set slots. + * + * Well, since 0 is reserved, return the ordinal number + * of the thread rather than the slot number. Awk, this + * counts as a kludge. + */ + if (slots) + return -(slot+1); + + if (thread_count && slot >= thread_count) + return -(slot+1); + + mid = map_slot_to_mid (slot); + + return mid; +} + +/* THREAD_ID 0 is special; it selects the first kernel + * thread from the list (i.e. SLOTNUMBER 0) + * This is used when starting the program with 'run' or when attaching. + * + * If FLAG is 0 the context is not changed, and the registers, frame, etc + * will continue to describe the old thread. + * + * If FLAG is nonzero, really select the thread. + * If FLAG is 2, the THREAD_ID is a slotnumber instead of a mid. + * + */ +kern_return_t +select_thread (task, thread_id, flag) + mach_port_t task; + int thread_id; + int flag; +{ + thread_array_t thread_list; + int thread_count; + kern_return_t ret; + int index; + thread_t new_thread = MACH_PORT_NULL; + + if (thread_id < 0) + error ("Can't select cprocs without kernel thread"); + + ret = task_threads (task, &thread_list, &thread_count); + if (ret != KERN_SUCCESS) + { + message ("Can not select a thread from a dead task"); + kill_inferior (); + return KERN_FAILURE; + } + + if (thread_count == 0) + { + /* The task can not do anything anymore, but it still + * exists as a container for memory and ports. + */ + registers_changed (); + message ("Task %d has no threads", + map_port_name_to_mid (task, MACH_TYPE_TASK)); + current_thread = MACH_PORT_NULL; + (void) vm_deallocate(mach_task_self(), + (vm_address_t) thread_list, + (thread_count * sizeof(mach_port_t))); + return KERN_FAILURE; + } + + if (! thread_id || flag == 2) + { + /* First thread or a slotnumber */ + if (! thread_id) + new_thread = thread_list[0]; + else + { + if (thread_id < thread_count) + new_thread = thread_list[ thread_id ]; + else + { + (void) vm_deallocate(mach_task_self(), + (vm_address_t) thread_list, + (thread_count * sizeof(mach_port_t))); + error ("No such thread slot number : %d", thread_id); + } + } + } + else + { + for (index = 0; index < thread_count; index++) + if (thread_id == map_port_name_to_mid (thread_list [index], + MACH_TYPE_THREAD)) + { + new_thread = thread_list [index]; + index = -1; + break; + } + + if (index != -1) + error ("No thread with mid %d", thread_id); + } + + /* Notify when the selected thread dies */ + request_notify (new_thread, MACH_NOTIFY_DEAD_NAME, MACH_TYPE_THREAD); + + ret = vm_deallocate(mach_task_self(), + (vm_address_t) thread_list, + (thread_count * sizeof(mach_port_t))); + CHK ("vm_deallocate", ret); + + if (! flag) + current_thread = new_thread; + else + { +#if 0 + if (MACH_PORT_VALID (current_thread)) + { + /* Store the gdb's view of the thread we are deselecting + * + * @@ I think gdb updates registers immediately when they are + * changed, so don't do this. + */ + ret = thread_abort (current_thread); + CHK ("Could not abort system calls when saving state of old thread", + ret); + target_prepare_to_store (); + target_store_registers (-1); + } +#endif + + registers_changed (); + + current_thread = new_thread; + + ret = thread_abort (current_thread); + CHK ("Could not abort system calls when selecting a thread", ret); + + stop_pc = read_pc(); + set_current_frame (create_new_frame (read_register (FP_REGNUM), + stop_pc)); + + select_frame (get_current_frame (), 0); + + stop_frame_address = FRAME_FP (get_current_frame ()); + } + + return KERN_SUCCESS; +} + +/* + * Switch to use thread named NEW_THREAD. + * Return it's MID + */ +int +switch_to_thread (new_thread) + thread_t new_thread; +{ + thread_t saved_thread = current_thread; + int mid; + + mid = map_port_name_to_mid (new_thread, + MACH_TYPE_THREAD); + if (mid == -1) + message ("Can't map thread name 0x%x to mid", new_thread); + else if (select_thread (inferior_task, mid, 1) != KERN_SUCCESS) + { + if (current_thread) + current_thread = saved_thread; + error ("Could not select thread %d", mid); + } + + return mid; +} + +/* Do this in gdb after doing FORK but before STARTUP_INFERIOR. + * Note that the registers are not yet valid in the inferior task. + */ +void +mach_create_inferior_hook (pid) + int pid; +{ + kern_return_t ret; + + inferior_task = task_by_pid (pid); + + if (! MACH_PORT_VALID (inferior_task)) + error ("Can not map Unix pid %d to Mach task", pid); + + /* Clean up previous notifications and create new ones */ + setup_notify_port (1); + + /* When notification appears, the inferior task has died */ + request_notify (inferior_task, MACH_NOTIFY_DEAD_NAME, MACH_TYPE_TASK); + + emulator_present = have_emulator_p (inferior_task); + + /* By default, select the first thread, + * If task has no threads, gives a warning + * Does not fetch registers, since they are not yet valid. + */ + select_thread (inferior_task, 0, 0); + + inferior_exception_port = MACH_PORT_NULL; + + setup_exception_port (); + + xx_debug ("Now the debugged task is created\n"); +} + +setup_exception_port () +{ + kern_return_t ret; + + ret = mach_port_allocate (mach_task_self(), + MACH_PORT_RIGHT_RECEIVE, + &inferior_exception_port); + CHK("mach_port_allocate",ret); + + /* add send right */ + ret = mach_port_insert_right (mach_task_self (), + inferior_exception_port, + inferior_exception_port, + MACH_MSG_TYPE_MAKE_SEND); + CHK("mach_port_insert_right",ret); + + ret = mach_port_move_member (mach_task_self(), + inferior_exception_port, + inferior_wait_port_set); + CHK("mach_port_move_member",ret); + + ret = task_get_special_port (inferior_task, + TASK_EXCEPTION_PORT, + &inferior_old_exception_port); + CHK ("task_get_special_port(old exc)",ret); + + ret = task_set_special_port (inferior_task, + TASK_EXCEPTION_PORT, + inferior_exception_port); + CHK("task_set_special_port",ret); + + ret = mach_port_deallocate (mach_task_self (), + inferior_exception_port); + CHK("mack_port_deallocate",ret); + +#if 0 + /* When notify appears, the inferior_task's exception + * port has been destroyed. + * + * Not used, since the dead_name_notification already + * appears when task dies. + * + */ + request_notify (inferior_exception_port, + MACH_NOTIFY_NO_SENDERS, + MACH_TYPE_EXCEPTION_PORT); +#endif +} + +/* Nonzero if gdb is waiting for a message */ +int mach_really_waiting; + +/* Wait for the inferior to stop for some reason. + - Loop on notifications until inferior_task dies. + - Loop on exceptions until stopped_in_exception comes true. + (e.g. we receive a single step trace trap) + - a message arrives to gdb's message port + + There is no other way to exit this loop. + + Returns the inferior_pid for rest of gdb. + Side effects: Set unix exit value to *w. + */ +int +mach_really_wait (w) + WAITTYPE *w; +{ + int pid; + kern_return_t ret; + + struct msg { + mach_msg_header_t header; + mach_msg_type_t foo; + int data[8000]; + } in_msg, out_msg; + + /* Either notify (death), exception or message can stop the inferior */ + stopped_in_exception = FALSE; + + while (1) + { + QUIT; + + stop_exception = stop_code = stop_subcode = -1; + stop_thread = MACH_PORT_NULL; + + mach_really_waiting = 1; + ret = mach_msg (&in_msg.header, /* header */ + MACH_RCV_MSG, /* options */ + 0, /* send size */ + sizeof (struct msg), /* receive size */ + currently_waiting_for, /* receive name */ + MACH_MSG_TIMEOUT_NONE, + MACH_PORT_NULL); + mach_really_waiting = 0; + CHK("mach_msg (receive)", ret); + + /* Check if we received a notify of the childs' death */ + if (notify_server (&in_msg.header, &out_msg.header)) + { + /* If inferior_task is null then the inferior has + gone away and we want to return to command level. + Otherwise it was just an informative message and we + need to look to see if there are any more. */ + if (inferior_task != MACH_PORT_NULL) + continue; + else + { + /* Collect Unix exit status for gdb */ + + wait3(w, WNOHANG, 0); + + /* This mess is here to check that the rest of + * gdb knows that the inferior died. It also + * tries to hack around the fact that Mach 3.0 (mk69) + * unix server (ux28) does not always know what + * has happened to it's children when mach-magic + * is applied on them. + */ + if ((!WIFEXITED(*w) && WIFSTOPPED(*w)) || + (WIFEXITED(*w) && WEXITSTATUS(*w) > 0377)) + { + WSETEXIT(*w, 0); + message ("Using exit value 0 for terminated task"); + } + else if (!WIFEXITED(*w)) + { + int sig = WTERMSIG(*w); + + /* Signals cause problems. Warn the user. */ + if (sig != SIGKILL) /* Bad luck if garbage matches this */ + message ("The terminating signal stuff may be nonsense"); + else if (sig > NSIG) + { + WSETEXIT(*w, 0); + message ("Using exit value 0 for terminated task"); + } + } + return inferior_pid; + } + } + + /* Hmm. Check for exception, as it was not a notification. + exc_server() does an upcall to catch_exception_raise() + if this rpc is an exception. Further actions are decided + there. + */ + if (! exc_server (&in_msg.header, &out_msg.header)) + { + + /* Not an exception, check for message. + * + * Messages don't come from the inferior, or if they + * do they better be asynchronous or it will hang. + */ + if (gdb_message_server (&in_msg.header)) + continue; + + error ("Unrecognized message received in mach_really_wait"); + } + + /* Send the reply of the exception rpc to the suspended task */ + ret = mach_msg_send (&out_msg.header); + CHK ("mach_msg_send (exc reply)", ret); + + if (stopped_in_exception) + { + /* Get unix state. May be changed in mach3_exception_actions() */ + wait3(w, WNOHANG, 0); + + mach3_exception_actions (w, FALSE, "Task"); + + return inferior_pid; + } + } +} + +/* Called by macro DO_QUIT() in utils.c(quit). + * This is called just before calling error() to return to command level + */ +void +mach3_quit () +{ + int mid; + kern_return_t ret; + + if (mach_really_waiting) + { + ret = task_suspend (inferior_task); + + if (ret != KERN_SUCCESS) + { + message ("Could not suspend task for interrupt: %s", + mach_error_string (ret)); + mach_really_waiting = 0; + return; + } + } + + must_suspend_thread = 0; + mach_really_waiting = 0; + + mid = map_port_name_to_mid (current_thread, MACH_TYPE_THREAD); + if (mid == -1) + { + message ("Selecting first existing kernel thread"); + mid = 0; + } + + current_thread = MACH_PORT_NULL; /* Force setup */ + select_thread (inferior_task, mid, 1); + + return; +} + +/* If ^C is typed when we are waiting for a message + * and your Unix server is able to notice that we + * should quit now. + * + * Called by REQUEST_QUIT() from utils.c(request_quit) + */ +void +mach3_request_quit () +{ + if (mach_really_waiting) + immediate_quit = 1; +} + +/* + * Gdb message server. + * Currently implemented is the STOP message, that causes + * gdb to return to the command level like ^C had been typed from terminal. + */ +int +gdb_message_server (InP) + mach_msg_header_t *InP; +{ + kern_return_t ret; + int mid; + + if (InP->msgh_local_port == our_message_port) + { + /* A message coming to our_message_port. Check validity */ + switch (InP->msgh_id) { + + case GDB_MESSAGE_ID_STOP: + ret = task_suspend (inferior_task); + if (ret != KERN_SUCCESS) + message ("Could not suspend task for stop message: %s", + mach_error_string (ret)); + + /* QUIT in mach_really_wait() loop. */ + request_quit (0); + break; + + default: + message ("Invalid message id %d received, ignored.", + InP->msgh_id); + break; + } + + return 1; + } + + /* Message not handled by this server */ + return 0; +} + +/* NOTE: This is not an RPC call. It is a simpleroutine. + * + * This is not called from this gdb code. + * + * It may be called by another debugger to cause this + * debugger to enter command level: + * + * (gdb) set stop_inferior_gdb () + * (gdb) continue + * + * External program "stop-gdb" implements this also. + */ +void +stop_inferior_gdb () +{ + kern_return_t ret; + + /* Code generated by mig, with minor cleanups :-) + * + * simpleroutine stop_inferior_gdb (our_message_port : mach_port_t); + */ + + typedef struct { + mach_msg_header_t Head; + } Request; + + Request Mess; + + register Request *InP = &Mess; + + InP->Head.msgh_bits = MACH_MSGH_BITS(MACH_MSG_TYPE_COPY_SEND, 0); + + /* msgh_size passed as argument */ + InP->Head.msgh_remote_port = our_message_port; + InP->Head.msgh_local_port = MACH_PORT_NULL; + InP->Head.msgh_seqno = 0; + InP->Head.msgh_id = GDB_MESSAGE_ID_STOP; + + ret = mach_msg (&InP->Head, + MACH_SEND_MSG|MACH_MSG_OPTION_NONE, + sizeof(Request), + 0, + MACH_PORT_NULL, + MACH_MSG_TIMEOUT_NONE, + MACH_PORT_NULL); +} + +#ifdef THREAD_ALLOWED_TO_BREAK +/* + * Return 1 if the MID specifies the thread that caused the + * last exception. + * Since catch_exception_raise() selects the thread causing + * the last exception to current_thread, we just check that + * it is selected and the last exception was a breakpoint. + */ +int +mach_thread_for_breakpoint (mid) + int mid; +{ + int cmid = map_port_name_to_mid (current_thread, MACH_TYPE_THREAD); + + if (mid < 0) + { + mid = map_slot_to_mid (-(mid+1), 0, 0); + if (mid < 0) + return 0; /* Don't stop, no such slot */ + } + + if (! mid || cmid == -1) + return 1; /* stop */ + + return cmid == mid && stop_exception == EXC_BREAKPOINT; +} +#endif /* THREAD_ALLOWED_TO_BREAK */ + +#ifdef THREAD_PARSE_ID +/* + * Map a thread id string (MID or a @SLOTNUMBER) + * to a thread-id. + * + * 0 matches all threads. + * Otherwise the meaning is defined only in this file. + * (mach_thread_for_breakpoint uses it) + * + * @@ This allows non-existent MIDs to be specified. + * It now also allows non-existent slots to be + * specified. (Slot numbers stored are negative, + * and the magnitude is one greater than the actual + * slot index. (Since 0 is reserved)) + */ +int +mach_thread_parse_id (arg) + char *arg; +{ + int mid; + if (arg == 0) + error ("thread id excpected"); + mid = parse_thread_id (arg, 0, 1); + + return mid; +} +#endif /* THREAD_PARSE_ID */ + +#ifdef THREAD_OUTPUT_ID +char * +mach_thread_output_id (mid) + int mid; +{ + static char foobar [20]; + + if (mid > 0) + sprintf (foobar, "mid %d", mid); + else if (mid < 0) + sprintf (foobar, "@%d", -(mid+1)); + else + sprintf (foobar, "*any thread*"); + + return foobar; +} +#endif /* THREAD_OUTPUT_ID */ + +/* Called with hook PREPARE_TO_PROCEED() from infrun.c. + * + * If we have switched threads and stopped at breakpoint return 1 otherwise 0. + * + * if SELECT_IT is nonzero, reselect the thread that was active when + * we stopped at a breakpoint. + * + */ + +mach3_prepare_to_proceed (select_it) + int select_it; +{ + if (stop_thread && + stop_thread != current_thread && + stop_exception == EXC_BREAKPOINT) + { + int mid; + + if (! select_it) + return 1; + + mid = switch_to_thread (stop_thread); + + return 1; + } + + return 0; +} + +/* this stuff here is an upcall via libmach/excServer.c + and mach_really_wait which does the actual upcall. + + The code will pass the exception to the inferior if: + + - The task that signaled is not the inferior task + (e.g. when debugging another debugger) + + - The user has explicitely requested to pass on the exceptions. + (e.g to the default unix exception handler, which maps + exceptions to signals, or the user has her own exception handler) + + - If the thread that signaled is being single-stepped and it + has set it's own exception port and the exception is not + EXC_BREAKPOINT. (Maybe this is not desirable?) + */ + +kern_return_t +catch_exception_raise (port, thread, task, exception, code, subcode) + mach_port_t port; + thread_t thread; + task_t task; + int exception, code, subcode; +{ + kern_return_t ret; + boolean_t signal_thread; + int mid = map_port_name_to_mid (thread, MACH_TYPE_THREAD); + + if (! MACH_PORT_VALID (thread)) + { + /* If the exception was sent and thread dies before we + receive it, THREAD will be MACH_PORT_DEAD + */ + + current_thread = thread = MACH_PORT_NULL; + error ("Received exception from nonexistent thread"); + } + + /* Check if the task died in transit. + * @@ Isn't the thread also invalid in such case? + */ + if (! MACH_PORT_VALID (task)) + { + current_thread = thread = MACH_PORT_NULL; + error ("Received exception from nonexistent task"); + } + + if (exception < 0 || exception > MAX_EXCEPTION) + fatal ("catch_exception_raise: unknown exception code %d thread %d", + exception, + mid); + + if (! MACH_PORT_VALID (inferior_task)) + error ("got an exception, but inferior_task is null or dead"); + + stop_exception = exception; + stop_code = code; + stop_subcode = subcode; + stop_thread = thread; + + signal_thread = exception != EXC_BREAKPOINT && + port == singlestepped_thread_port && + MACH_PORT_VALID (thread_saved_exception_port); + + /* If it was not our inferior or if we want to forward + * the exception to the inferior's handler, do it here + * + * Note: If you have forwarded EXC_BREAKPOINT I trust you know why. + */ + if (task != inferior_task || + signal_thread || + exception_map [exception].forward) + { + mach_port_t eport = inferior_old_exception_port; + + if (signal_thread) + { + /* + GDB now forwards the exeption to thread's original handler, + since the user propably knows what he is doing. + Give a message, though. + */ + + mach3_exception_actions ((WAITTYPE *)NULL, TRUE, "Thread"); + eport = thread_saved_exception_port; + } + + /* Send the exception to the original handler */ + ret = exception_raise (eport, + thread, + task, + exception, + code, + subcode); + + (void) mach_port_deallocate (mach_task_self (), task); + (void) mach_port_deallocate (mach_task_self (), thread); + + /* If we come here, we don't want to trace any more, since we + * will never stop for tracing anyway. + */ + discard_single_step (thread); + + /* Do not stop the inferior */ + return ret; + } + + /* Now gdb handles the exception */ + stopped_in_exception = TRUE; + + ret = task_suspend (task); + CHK ("Error suspending inferior after exception", ret); + + must_suspend_thread = 0; + + if (current_thread != thread) + { + if (MACH_PORT_VALID (singlestepped_thread_port)) + /* Cleanup discards single stepping */ + error ("Exception from thread %d while singlestepping thread %d", + mid, + map_port_name_to_mid (current_thread, MACH_TYPE_THREAD)); + + /* Then select the thread that caused the exception */ + if (select_thread (inferior_task, mid, 0) != KERN_SUCCESS) + error ("Could not select thread %d causing exception", mid); + else + message ("Gdb selected thread %d", mid); + } + + /* If we receive an exception that is not breakpoint + * exception, we interrupt the single step and return to + * debugger. Trace condition is cleared. + */ + if (MACH_PORT_VALID (singlestepped_thread_port)) + { + if (stop_exception != EXC_BREAKPOINT) + message ("Single step interrupted by exception"); + else if (port == singlestepped_thread_port) + { + /* Single step exception occurred, remove trace bit + * and return to gdb. + */ + if (! MACH_PORT_VALID (current_thread)) + error ("Single stepped thread is not valid"); + + /* Resume threads, but leave the task suspended */ + resume_all_threads (0); + } + else + message ("Breakpoint while single stepping?"); + + discard_single_step (current_thread); + } + + (void) mach_port_deallocate (mach_task_self (), task); + (void) mach_port_deallocate (mach_task_self (), thread); + + return KERN_SUCCESS; +} + +int +port_valid (port, mask) + mach_port_t port; + int mask; +{ + kern_return_t ret; + mach_port_type_t type; + + ret = mach_port_type (mach_task_self (), + port, + &type); + if (ret != KERN_SUCCESS || (type & mask) != mask) + return 0; + return 1; +} + +/* @@ No vm read cache implemented yet */ +boolean_t vm_read_cache_valid = FALSE; + +/* + * Read inferior task's LEN bytes from ADDR and copy it to MYADDR + * in gdb's address space. + * + * Return 0 on failure; number of bytes read otherwise. + */ +int +mach3_read_inferior (addr, myaddr, length) + CORE_ADDR addr; + char *myaddr; + int length; +{ + kern_return_t ret; + vm_address_t low_address = (vm_address_t) trunc_page (addr); + vm_size_t aligned_length = + (vm_size_t) round_page (addr+length) - low_address; + pointer_t copied_memory; + int copy_count; + + /* Get memory from inferior with page aligned addresses */ + ret = vm_read (inferior_task, + low_address, + aligned_length, + &copied_memory, + ©_count); + if (ret != KERN_SUCCESS) + { + /* the problem is that the inferior might be killed for whatever reason + * before we go to mach_really_wait. This is one place that ought to + * catch many of those errors. + * @@ A better fix would be to make all external events to GDB + * to arrive via a SINGLE port set. (Including user input!) + */ + + if (! port_valid (inferior_task, MACH_PORT_TYPE_SEND)) + { + kill_inferior (); + error ("Inferior killed (task port invalid)"); + } + else + { +#ifdef OSF + extern int errno; + /* valprint.c gives nicer format if this does not + screw it. Eamonn seems to like this, so I enable + it if OSF is defined... + */ + message ("[read inferior %x failed: %s]", + addr, mach_error_string (ret)); + errno = 0; +#endif + return 0; + } + } + + bcopy ((char *)addr - low_address + copied_memory, myaddr, length); + + ret = vm_deallocate (mach_task_self (), + copied_memory, + copy_count); + CHK("mach3_read_inferior vm_deallocate failed", ret); + + return length; +} + +#ifdef __STDC__ +#define CHK_GOTO_OUT(str,ret) \ + do if (ret != KERN_SUCCESS) { errstr = #str; goto out; } while(0) +#else +#define CHK_GOTO_OUT(str,ret) \ + do if (ret != KERN_SUCCESS) { errstr = str; goto out; } while(0) +#endif + +struct vm_region_list { + struct vm_region_list *next; + vm_prot_t protection; + vm_address_t start; + vm_size_t length; +}; + +struct obstack region_obstack; + +/* + * Write inferior task's LEN bytes from ADDR and copy it to MYADDR + * in gdb's address space. + */ +int +mach3_write_inferior (addr, myaddr, length) + CORE_ADDR addr; + char *myaddr; + int length; +{ + kern_return_t ret; + vm_address_t low_address = (vm_address_t) trunc_page (addr); + vm_size_t aligned_length = + (vm_size_t) round_page (addr+length) - low_address; + pointer_t copied_memory; + int copy_count; + int deallocate = 0; + + char *errstr = "Bug in mach3_write_inferior"; + + struct vm_region_list *region_element; + struct vm_region_list *region_head = (struct vm_region_list *)NULL; + + /* Get memory from inferior with page aligned addresses */ + ret = vm_read (inferior_task, + low_address, + aligned_length, + &copied_memory, + ©_count); + CHK_GOTO_OUT ("mach3_write_inferior vm_read failed", ret); + + deallocate++; + + bcopy (myaddr, (char *)addr - low_address + copied_memory, length); + + obstack_init (®ion_obstack); + + /* Do writes atomically. + * First check for holes and unwritable memory. + */ + { + vm_size_t remaining_length = aligned_length; + vm_address_t region_address = low_address; + + struct vm_region_list *scan; + + while(region_address < low_address + aligned_length) + { + vm_prot_t protection; + vm_prot_t max_protection; + vm_inherit_t inheritance; + boolean_t shared; + mach_port_t object_name; + vm_offset_t offset; + vm_size_t region_length = remaining_length; + vm_address_t old_address = region_address; + + ret = vm_region (inferior_task, + ®ion_address, + ®ion_length, + &protection, + &max_protection, + &inheritance, + &shared, + &object_name, + &offset); + CHK_GOTO_OUT ("vm_region failed", ret); + + /* Check for holes in memory */ + if (old_address != region_address) + { + message ("No memory at 0x%x. Nothing written", + old_address); + ret = KERN_SUCCESS; + length = 0; + goto out; + } + + if (!(max_protection & VM_PROT_WRITE)) + { + message ("Memory at address 0x%x is unwritable. Nothing written", + old_address); + ret = KERN_SUCCESS; + length = 0; + goto out; + } + + /* Chain the regions for later use */ + region_element = + (struct vm_region_list *) + obstack_alloc (®ion_obstack, sizeof (struct vm_region_list)); + + region_element->protection = protection; + region_element->start = region_address; + region_element->length = region_length; + + /* Chain the regions along with protections */ + region_element->next = region_head; + region_head = region_element; + + region_address += region_length; + remaining_length = remaining_length - region_length; + } + + /* If things fail after this, we give up. + * Somebody is messing up inferior_task's mappings. + */ + + /* Enable writes to the chained vm regions */ + for (scan = region_head; scan; scan = scan->next) + { + boolean_t protection_changed = FALSE; + + if (!(scan->protection & VM_PROT_WRITE)) + { + ret = vm_protect (inferior_task, + scan->start, + scan->length, + FALSE, + scan->protection | VM_PROT_WRITE); + CHK_GOTO_OUT ("vm_protect: enable write failed", ret); + } + } + + ret = vm_write (inferior_task, + low_address, + copied_memory, + aligned_length); + CHK_GOTO_OUT ("vm_write failed", ret); + + /* Set up the original region protections, if they were changed */ + for (scan = region_head; scan; scan = scan->next) + { + boolean_t protection_changed = FALSE; + + if (!(scan->protection & VM_PROT_WRITE)) + { + ret = vm_protect (inferior_task, + scan->start, + scan->length, + FALSE, + scan->protection); + CHK_GOTO_OUT ("vm_protect: enable write failed", ret); + } + } + } + + out: + if (deallocate) + { + obstack_free (®ion_obstack, 0); + + (void) vm_deallocate (mach_task_self (), + copied_memory, + copy_count); + } + + if (ret != KERN_SUCCESS) + { + message ("%s %s", errstr, mach_error_string (ret)); + return 0; + } + + return length; +} + +/* + * Return 0 on failure, number of bytes handled otherwise. + */ +int +child_xfer_memory (memaddr, myaddr, len, write, target) + CORE_ADDR memaddr; + char *myaddr; + int len; + int write; + struct target_ops *target; /* IGNORED */ +{ + int result; + + if (write) + result = mach3_write_inferior (memaddr, myaddr, len); + else + result = mach3_read_inferior (memaddr, myaddr, len); + + return result; +} + + +private char * +translate_state(state) +int state; +{ + switch (state) { + case TH_STATE_RUNNING: return("R"); + case TH_STATE_STOPPED: return("S"); + case TH_STATE_WAITING: return("W"); + case TH_STATE_UNINTERRUPTIBLE: return("U"); + case TH_STATE_HALTED: return("H"); + default: return("?"); + } +} + +private char * +translate_cstate(state) +int state; +{ + switch (state) { + case CPROC_RUNNING: return "R"; + case CPROC_SWITCHING: return "S"; + case CPROC_BLOCKED: return "B"; + case CPROC_CONDWAIT: return "C"; + case CPROC_CONDWAIT|CPROC_SWITCHING: + return "CS"; + default: return "?"; + } +} + +/* type == MACH_MSG_TYPE_COPY_SEND || type == MACH_MSG_TYPE_MAKE_SEND + */ + +mach_port_t /* no mach_port_name_t found in include files. */ +map_inferior_port_name (inferior_name, type) + mach_port_t inferior_name; + mach_msg_type_name_t type; +{ + kern_return_t ret; + mach_msg_type_name_t acquired; + mach_port_t iport; + + ret = mach_port_extract_right (inferior_task, + inferior_name, + type, + &iport, + &acquired); + CHK("mach_port_extract_right (map_inferior_port_name)", ret); + + if (acquired != MACH_MSG_TYPE_PORT_SEND) + error("Incorrect right extracted, (map_inferior_port_name)"); + + ret = mach_port_deallocate (mach_task_self (), + iport); + CHK ("Deallocating mapped port (map_inferior_port_name)", ret); + + return iport; +} + +/* + * Naming convention: + * Always return user defined name if found. + * _K == A kernel thread with no matching CPROC + * _C == A cproc with no current cthread + * _t == A cthread with no user defined name + * + * The digits that follow the _names are the SLOT number of the + * kernel thread if there is such a thing, otherwise just a negation + * of the sequential number of such cprocs. + */ + +private char buf[7]; + +private char * +get_thread_name (one_cproc, id) + cproc_t one_cproc; + int id; +{ + if (one_cproc) + if (one_cproc->incarnation == NULL) + { + /* cproc not mapped to any cthread */ + sprintf(buf, "_C%d", id); + } + else if (! one_cproc->incarnation->name) + { + /* cproc and cthread, but no name */ + sprintf(buf, "_t%d", id); + } + else + return (one_cproc->incarnation->name); + else + { + if (id < 0) + message ("Inconsistency in thread name id %d", id); + + /* Kernel thread without cproc */ + sprintf(buf, "_K%d", id); + } + + return buf; +} + +int +fetch_thread_info (task, mthreads_out) + mach_port_t task; + gdb_thread_t *mthreads_out; /* out */ +{ + kern_return_t ret; + thread_array_t th_table; + int th_count; + gdb_thread_t mthreads = NULL; + int index; + + ret = task_threads (task, &th_table, &th_count); + if (ret != KERN_SUCCESS) + { + message ("Error getting inferior's thread list:%s", + mach_error_string(ret)); + kill_inferior (); + return -1; + } + + mthreads = (gdb_thread_t) + obstack_alloc + (cproc_obstack, + th_count * sizeof (struct gdb_thread)); + + for (index = 0; index < th_count; index++) + { + thread_t saved_thread = MACH_PORT_NULL; + int mid; + + if (must_suspend_thread) + setup_thread (th_table[ index ], 1); + + if (th_table[index] != current_thread) + { + saved_thread = current_thread; + + mid = switch_to_thread (th_table[ index ]); + } + + mthreads[index].name = th_table[index]; + mthreads[index].cproc = NULL; /* map_cprocs_to_kernel_threads() */ + mthreads[index].in_emulator = FALSE; + mthreads[index].slotid = index; + + mthreads[index].sp = read_register (SP_REGNUM); + mthreads[index].fp = read_register (FP_REGNUM); + mthreads[index].pc = read_pc (); + + if (MACH_PORT_VALID (saved_thread)) + mid = switch_to_thread (saved_thread); + + if (must_suspend_thread) + setup_thread (th_table[ index ], 0); + } + + consume_send_rights (th_table, th_count); + ret = vm_deallocate (mach_task_self(), (vm_address_t)th_table, + (th_count * sizeof(mach_port_t))); + if (ret != KERN_SUCCESS) + { + message ("Error trying to deallocate thread list : %s", + mach_error_string (ret)); + } + + *mthreads_out = mthreads; + + return th_count; +} + + +/* + * Current emulator always saves the USP on top of + * emulator stack below struct emul_stack_top stuff. + */ +CORE_ADDR +fetch_usp_from_emulator_stack (sp) + CORE_ADDR sp; +{ + CORE_ADDR stack_pointer; + + sp = (sp & ~(EMULATOR_STACK_SIZE-1)) + + EMULATOR_STACK_SIZE - sizeof (struct emul_stack_top); + + if (mach3_read_inferior (sp, + &stack_pointer, + sizeof (CORE_ADDR)) != sizeof (CORE_ADDR)) + { + message ("Can't read user sp from emulator stack address 0x%x", sp); + return 0; + } + + return stack_pointer; +} + +#ifdef MK67 + +/* get_emulation_vector() interface was changed after mk67 */ +#define EMUL_VECTOR_COUNT 400 /* Value does not matter too much */ + +#endif /* MK67 */ + +/* Check if the emulator exists at task's address space. + */ +boolean_t +have_emulator_p (task) + task_t task; +{ + kern_return_t ret; +#ifndef EMUL_VECTOR_COUNT + vm_offset_t *emulation_vector; + int n; +#else + vm_offset_t emulation_vector[ EMUL_VECTOR_COUNT ]; + int n = EMUL_VECTOR_COUNT; +#endif + int i; + int vector_start; + + ret = task_get_emulation_vector (task, + &vector_start, +#ifndef EMUL_VECTOR_COUNT + &emulation_vector, +#else + emulation_vector, +#endif + &n); + CHK("task_get_emulation_vector", ret); + xx_debug ("%d vectors from %d at 0x%08x\n", + n, vector_start, emulation_vector); + + for(i = 0; i < n; i++) + { + vm_offset_t entry = emulation_vector [i]; + + if (EMULATOR_BASE <= entry && entry <= EMULATOR_END) + return TRUE; + else if (entry) + { + static boolean_t informed = FALSE; + if (!informed) + { + message("Emulation vector address 0x08%x outside emulator space", + entry); + informed = TRUE; + } + } + } + return FALSE; +} + +/* + * Map cprocs to kernel threads and vice versa. + * + * For reverse mapping the code mis-uses one struct cproc field, + * see "os-mach3.h" and code here. + * + */ + +void +map_cprocs_to_kernel_threads (cprocs, mthreads, thread_count) + cproc_t cprocs; + gdb_thread_t mthreads; + int thread_count; +{ + int index; + cproc_t scan; + boolean_t all_mapped = TRUE; + + for (scan = cprocs; scan; scan = scan->list) + { + /* Default to: no kernel thread for this cproc */ + CPROC_REVERSE_MAP (scan) = -1; + + /* Check if the cproc is found by its stack */ + for (index = 0; index < thread_count; index++) + { + if ((mthreads + index)->sp > scan->stack_base && + (mthreads + index)->sp <= scan->stack_base + scan->stack_size) + { + (mthreads + index)->cproc = scan; + CPROC_REVERSE_MAP (scan) = index; + break; + } + } + all_mapped &= (CPROC_REVERSE_MAP(scan) != -1); + } + + /* Check for threads that are currently in the emulator. + * If so, they have a different stack, and the still unmapped + * cprocs may well get mapped to these threads. + * + * If: + * - cproc stack does not match any kernel thread stack pointer + * - there is at least one extra kernel thread + * that has no cproc mapped above. + * - some kernel thread stack pointer points to emulator space + * then we find the user stack pointer saved in the emulator + * stack, and try to map that to the cprocs. + * + * Also set in_emulator for kernel threads. + */ + + if (emulator_present) + { + for (index = 0; index < thread_count; index++) + { + CORE_ADDR emul_sp; + CORE_ADDR usp; + + gdb_thread_t mthread = (mthreads+index); + emul_sp = mthread->sp; + + if (! mthread->cproc && + EMULATOR_BASE <= emul_sp && emul_sp <= EMULATOR_END) + { + mthread->in_emulator = emulator_present; + + if (!all_mapped && cprocs) + { + usp = fetch_usp_from_emulator_stack (emul_sp); + + /* @@ Could be more accurate */ + if (! usp) + error ("Zero stack pointer read from emulator?"); + + /* Try to match this stack pointer to the cprocs that + * don't yet have a kernel thread. + */ + for (scan = cprocs; scan; scan = scan->list) + { + + /* Check is this unmapped CPROC stack contains + * the user stack pointer saved in the + * emulator. + */ + if (CPROC_REVERSE_MAP (scan) == -1 && + usp > scan->stack_base && + usp <= scan->stack_base + scan->stack_size) + { + mthread->cproc = scan; + CPROC_REVERSE_MAP (scan) = index; + break; + } + } + } + } + } + } +} + +/* + * Format of the thread_list command + * + * slot mid sel name emul ks susp cstate wired address + */ +#define TL_FORMAT "%-2.2s %5d%c %-10.10s %1.1s%s%-5.5s %-2.2s %-5.5s " + +#define TL_HEADER "\n@ MID Name KState CState Where\n" + +void +print_tl_address (stream, pc) + FILE *stream; + CORE_ADDR pc; +{ + if (! lookup_minimal_symbol_by_pc (pc)) + fprintf_filtered (stream, local_hex_format(), pc); + else + { + extern int addressprint; + extern int asm_demangle; + + int store = addressprint; + addressprint = 0; + print_address_symbolic (pc, stream, asm_demangle, ""); + addressprint = store; + } +} + +/* For thread names, but also for gdb_message_port external name */ +#define MAX_NAME_LEN 50 + +/* Returns the address of variable NAME or 0 if not found */ +CORE_ADDR +lookup_address_of_variable (name) + char *name; +{ + struct symbol *sym; + CORE_ADDR symaddr = 0; + struct minimal_symbol *msymbol; + + sym = lookup_symbol (name, + (struct block *)NULL, + VAR_NAMESPACE, + (int *)NULL, + (struct symtab **)NULL); + + if (sym) + symaddr = SYMBOL_VALUE (sym); + + if (! symaddr) + { + msymbol = lookup_minimal_symbol (name, (struct objfile *) NULL); + + if (msymbol && msymbol->type == mst_data) + symaddr = msymbol->address; + } + + return symaddr; +} + +private cproc_t +get_cprocs() +{ + cproc_t their_cprocs, cproc_head, cproc_copy; + char *name; + cthread_t cthread; + CORE_ADDR symaddr; + + symaddr = lookup_address_of_variable ("cproc_list"); + + if (! symaddr) + { /* cproc_list is not in a file compiled with debugging + symbols, but don't give up yet */ + + symaddr = lookup_address_of_variable ("cprocs"); + + if (symaddr) + { + static int informed = 0; + if (!informed) { + informed++; + message ("Your program is loaded with an old threads library."); + message ("GDB does not know the old form of threads"); + message ("so things may not work."); + } + } + } + + /* Stripped or no -lthreads loaded or "cproc_list" is in wrong segment. */ + if (! symaddr) + return NO_CPROC; + + /* Get the address of the first cproc in the task */ + if (!mach3_read_inferior(symaddr, + &their_cprocs, + sizeof(cproc_t))) + error("Can't read cproc master list at address (0x%x).", symaddr); + + /* Scan the CPROCs in the task. + CPROCs are chained with LIST field, not NEXT field, which + chains mutexes, condition variables and queues */ + + cproc_head = NO_CPROC; + + while (their_cprocs != NO_CPROC) + { + cproc_copy = (cproc_t) obstack_alloc(cproc_obstack, + sizeof(struct cproc)); + + if (!mach3_read_inferior(their_cprocs, + cproc_copy, + sizeof(struct cproc))) + error("Can't read next cproc at 0x%x.", their_cprocs); + + their_cprocs = cproc_copy->list; + + if (cproc_copy->incarnation != NULL) + { + /* This CPROC has an attached CTHREAD. Get its name */ + cthread = (cthread_t)obstack_alloc (cproc_obstack, + sizeof(struct cthread)); + + if (!mach3_read_inferior(cproc_copy->incarnation, + cthread, + sizeof(struct cthread))) + error("Can't read next thread at 0x%x.", + cproc_copy->incarnation); + + cproc_copy->incarnation = cthread; + + if (cthread->name) + { + name = (char *) obstack_alloc (cproc_obstack, MAX_NAME_LEN); + + if (!mach3_read_inferior(cthread->name, name, MAX_NAME_LEN)) + error("Can't read next thread's name at 0x%x.", cthread->name); + + cthread->name = name; + } + } + + /* insert in front */ + cproc_copy->list = cproc_head; + cproc_head = cproc_copy; + } + return(cproc_head); +} + +#ifndef FETCH_CPROC_STATE +/* + * Check if your machine does not grok the way this routine + * fetches the FP,PC and SP of a cproc that is not + * currently attached to any kernel thread (e.g. its cproc.context + * field points to the place in stack where the context + * is saved). + * + * If it doesn't, define your own routine. + */ +#define FETCH_CPROC_STATE(mth) mach3_cproc_state (mth) + +int +mach3_cproc_state (mthread) + gdb_thread_t mthread; +{ + int context; + + if (! mthread || !mthread->cproc || !mthread->cproc->context) + return -1; + + context = mthread->cproc->context; + + mthread->sp = context + MACHINE_CPROC_SP_OFFSET; + + if (mach3_read_inferior (context + MACHINE_CPROC_PC_OFFSET, + &mthread->pc, + sizeof (CORE_ADDR)) != sizeof (CORE_ADDR)) + { + message ("Can't read cproc pc from inferior"); + return -1; + } + + if (mach3_read_inferior (context + MACHINE_CPROC_FP_OFFSET, + &mthread->fp, + sizeof (CORE_ADDR)) != sizeof (CORE_ADDR)) + { + message ("Can't read cproc fp from inferior"); + return -1; + } + + return 0; +} +#endif /* FETCH_CPROC_STATE */ + + +void +thread_list_command() +{ + thread_basic_info_data_t ths; + int thread_count; + cproc_t cprocs; + cproc_t scan; + int index; + char *name; + char selected; + char *wired; + int infoCnt; + kern_return_t ret; + mach_port_t mid_or_port; + gdb_thread_t their_threads; + gdb_thread_t kthread; + + int neworder = 1; + + char *fmt = "There are %d kernel threads in task %d.\n"; + + int tmid = map_port_name_to_mid (inferior_task, MACH_TYPE_TASK); + + MACH_ERROR_NO_INFERIOR; + + thread_count = fetch_thread_info (inferior_task, + &their_threads); + if (thread_count == -1) + return; + + if (thread_count == 1) + fmt = "There is %d kernel thread in task %d.\n"; + + printf_filtered (fmt, thread_count, tmid); + + puts_filtered (TL_HEADER); + + cprocs = get_cprocs(); + + map_cprocs_to_kernel_threads (cprocs, their_threads, thread_count); + + for (scan = cprocs; scan; scan = scan->list) + { + int mid; + char buf[10]; + char slot[3]; + + selected = ' '; + + /* a wired cproc? */ + wired = scan->wired ? "wired" : ""; + + if (CPROC_REVERSE_MAP(scan) != -1) + kthread = (their_threads + CPROC_REVERSE_MAP(scan)); + else + kthread = NULL; + + if (kthread) + { + /* These cprocs have a kernel thread */ + + mid = map_port_name_to_mid (kthread->name, MACH_TYPE_THREAD); + + infoCnt = THREAD_BASIC_INFO_COUNT; + + ret = thread_info (kthread->name, + THREAD_BASIC_INFO, + (thread_info_t)&ths, + &infoCnt); + + if (ret != KERN_SUCCESS) + { + message ("Unable to get basic info on thread %d : %s", + mid, + mach_error_string (ret)); + continue; + } + + /* Who is the first to have more than 100 threads */ + sprintf (slot, "%d", kthread->slotid%100); + + if (kthread->name == current_thread) + selected = '*'; + + if (ths.suspend_count) + sprintf (buf, "%d", ths.suspend_count); + else + buf[0] = '\000'; + +#if 0 + if (ths.flags & TH_FLAGS_SWAPPED) + strcat (buf, "S"); +#endif + + if (ths.flags & TH_FLAGS_IDLE) + strcat (buf, "I"); + + printf_filtered (TL_FORMAT, + slot, + mid, + selected, + get_thread_name (scan, kthread->slotid), + kthread->in_emulator ? "E" : "", + translate_state (ths.run_state), + buf, + translate_cstate (scan->state), + wired); + print_tl_address (stdout, kthread->pc); + } + else + { + /* These cprocs don't have a kernel thread. + * find out the calling frame with + * FETCH_CPROC_STATE. + */ + + struct gdb_thread state; + +#if 0 + /* jtv -> emcmanus: why do you want this here? */ + if (scan->incarnation == NULL) + continue; /* EMcM */ +#endif + + printf_filtered (TL_FORMAT, + "-", + -neworder, /* Pseudo MID */ + selected, + get_thread_name (scan, -neworder), + "", + "-", /* kernel state */ + "", + translate_cstate (scan->state), + ""); + state.cproc = scan; + + if (FETCH_CPROC_STATE (&state) == -1) + puts_filtered ("???"); + else + print_tl_address (stdout, state.pc); + + neworder++; + } + puts_filtered ("\n"); + } + + /* Scan for kernel threads without cprocs */ + for (index = 0; index < thread_count; index++) + { + if (! their_threads[index].cproc) + { + int mid; + + char buf[10]; + char slot[3]; + + mach_port_t name = their_threads[index].name; + + mid = map_port_name_to_mid (name, MACH_TYPE_THREAD); + + infoCnt = THREAD_BASIC_INFO_COUNT; + + ret = thread_info(name, + THREAD_BASIC_INFO, + (thread_info_t)&ths, + &infoCnt); + + if (ret != KERN_SUCCESS) + { + message ("Unable to get basic info on thread %d : %s", + mid, + mach_error_string (ret)); + continue; + } + + sprintf (slot, "%d", index%100); + + if (name == current_thread) + selected = '*'; + else + selected = ' '; + + if (ths.suspend_count) + sprintf (buf, "%d", ths.suspend_count); + else + buf[0] = '\000'; + +#if 0 + if (ths.flags & TH_FLAGS_SWAPPED) + strcat (buf, "S"); +#endif + + if (ths.flags & TH_FLAGS_IDLE) + strcat (buf, "I"); + + printf_filtered (TL_FORMAT, + slot, + mid, + selected, + get_thread_name (NULL, index), + their_threads[index].in_emulator ? "E" : "", + translate_state (ths.run_state), + buf, + "", /* No cproc state */ + ""); /* Can't be wired */ + print_tl_address (stdout, their_threads[index].pc); + puts_filtered ("\n"); + } + } + + obstack_free (cproc_obstack, 0); + obstack_init (cproc_obstack); +} + +void +thread_select_command(args, from_tty) + char *args; + int from_tty; +{ + int mid; + thread_array_t thread_list; + int thread_count; + kern_return_t ret; + int is_slot = 0; + + MACH_ERROR_NO_INFERIOR; + + if (!args) + error_no_arg ("MID or @SLOTNUMBER to specify a thread to select"); + + while (*args == ' ' || *args == '\t') + args++; + + if (*args == '@') + { + is_slot++; + args++; + } + + mid = atoi(args); + + if (mid == 0) + if (!is_slot || *args != '0') /* Rudimentary checks */ + error ("You must select threads by MID or @SLOTNUMBER"); + + if (select_thread (inferior_task, mid, is_slot?2:1) != KERN_SUCCESS) + return; + + if (from_tty) + printf_filtered ("Thread %d selected\n", + is_slot ? map_port_name_to_mid (current_thread, + MACH_TYPE_THREAD) : mid); +} + +thread_trace (thread, set) +mach_port_t thread; +boolean_t set; +{ + int flavor = TRACE_FLAVOR; + unsigned int stateCnt = TRACE_FLAVOR_SIZE; + kern_return_t ret; + thread_state_data_t state; + + if (! MACH_PORT_VALID (thread)) + { + message ("thread_trace: invalid thread"); + return; + } + + if (must_suspend_thread) + setup_thread (thread, 1); + + ret = thread_get_state(thread, flavor, state, &stateCnt); + CHK ("thread_trace: error reading thread state", ret); + + if (set) + { + TRACE_SET (thread, state); + } + else + { + if (! TRACE_CLEAR (thread, state)) + { + if (must_suspend_thread) + setup_thread (thread, 0); + return; + } + } + + ret = thread_set_state(thread, flavor, state, stateCnt); + CHK ("thread_trace: error writing thread state", ret); + if (must_suspend_thread) + setup_thread (thread, 0); +} + +#ifdef FLUSH_INFERIOR_CACHE + +/* When over-writing code on some machines the I-Cache must be flushed + explicitly, because it is not kept coherent by the lazy hardware. + This definitely includes breakpoints, for instance, or else we + end up looping in mysterious Bpt traps */ + +flush_inferior_icache(pc, amount) + CORE_ADDR pc; +{ + vm_machine_attribute_val_t flush = MATTR_VAL_ICACHE_FLUSH; + kern_return_t ret; + + ret = vm_machine_attribute (inferior_task, + pc, + amount, + MATTR_CACHE, + &flush); + if (ret != KERN_SUCCESS) + message ("Error flushing inferior's cache : %s", + mach_error_string (ret)); +} +#endif FLUSH_INFERIOR_CACHE + + +private +suspend_all_threads (from_tty) + int from_tty; +{ + kern_return_t ret; + thread_array_t thread_list; + int thread_count, index; + int infoCnt; + thread_basic_info_data_t th_info; + + + ret = task_threads (inferior_task, &thread_list, &thread_count); + if (ret != KERN_SUCCESS) + { + message ("Could not suspend inferior threads."); + kill_inferior (); + return_to_top_level (); + } + + for (index = 0; index < thread_count; index++) + { + int mid; + + mid = map_port_name_to_mid (thread_list[ index ], + MACH_TYPE_THREAD); + + ret = thread_suspend(thread_list[ index ]); + + if (ret != KERN_SUCCESS) + message ("Error trying to suspend thread %d : %s", + mid, mach_error_string (ret)); + + if (from_tty) + { + infoCnt = THREAD_BASIC_INFO_COUNT; + ret = thread_info (thread_list[ index ], + THREAD_BASIC_INFO, + (thread_info_t) &th_info, + &infoCnt); + CHK ("suspend can't get thread info", ret); + + message ("Thread %d suspend count is %d", + mid, th_info.suspend_count); + } + } + + consume_send_rights (thread_list, thread_count); + ret = vm_deallocate(mach_task_self(), + (vm_address_t)thread_list, + (thread_count * sizeof(int))); + CHK ("Error trying to deallocate thread list", ret); +} + +void +thread_suspend_command (args, from_tty) + char *args; + int from_tty; +{ + kern_return_t ret; + int mid; + mach_port_t saved_thread; + int infoCnt; + thread_basic_info_data_t th_info; + + MACH_ERROR_NO_INFERIOR; + + if (!strcasecmp (args, "all")) { + suspend_all_threads (from_tty); + return; + } + + saved_thread = current_thread; + + mid = parse_thread_id (args, 0, 0); + + if (mid < 0) + error ("You can suspend only existing kernel threads with MID or @SLOTNUMBER"); + + if (mid == 0) + mid = map_port_name_to_mid (current_thread, MACH_TYPE_THREAD); + else + if (select_thread (inferior_task, mid, 0) != KERN_SUCCESS) + { + if (current_thread) + current_thread = saved_thread; + error ("Could not select thread %d", mid); + } + + ret = thread_suspend (current_thread); + if (ret != KERN_SUCCESS) + message ("thread_suspend failed : %s", + mach_error_string (ret)); + + infoCnt = THREAD_BASIC_INFO_COUNT; + ret = thread_info (current_thread, + THREAD_BASIC_INFO, + (thread_info_t) &th_info, + &infoCnt); + CHK ("suspend can't get thread info", ret); + + message ("Thread %d suspend count is %d", mid, th_info.suspend_count); + + current_thread = saved_thread; +} + +resume_all_threads (from_tty) + int from_tty; +{ + kern_return_t ret; + thread_array_t thread_list; + int thread_count, index; + int mid; + int infoCnt; + thread_basic_info_data_t th_info; + + ret = task_threads (inferior_task, &thread_list, &thread_count); + if (ret != KERN_SUCCESS) + { + kill_inferior (); + error("task_threads", mach_error_string( ret)); + } + + for (index = 0; index < thread_count; index++) + { + infoCnt = THREAD_BASIC_INFO_COUNT; + ret = thread_info (thread_list [ index ], + THREAD_BASIC_INFO, + (thread_info_t) &th_info, + &infoCnt); + CHK ("resume_all can't get thread info", ret); + + mid = map_port_name_to_mid (thread_list[ index ], + MACH_TYPE_THREAD); + + if (! th_info.suspend_count) + { + if (mid != -1 && from_tty) + message ("Thread %d is not suspended", mid); + continue; + } + + ret = thread_resume (thread_list[ index ]); + + if (ret != KERN_SUCCESS) + message ("Error trying to resume thread %d : %s", + mid, mach_error_string (ret)); + else if (mid != -1 && from_tty) + message ("Thread %d suspend count is %d", + mid, --th_info.suspend_count); + } + + consume_send_rights (thread_list, thread_count); + ret = vm_deallocate(mach_task_self(), + (vm_address_t)thread_list, + (thread_count * sizeof(int))); + CHK("Error trying to deallocate thread list", ret); +} + +void +thread_resume_command (args, from_tty) + char *args; + int from_tty; +{ + int mid; + mach_port_t saved_thread; + kern_return_t ret; + thread_basic_info_data_t th_info; + int infoCnt = THREAD_BASIC_INFO_COUNT; + + MACH_ERROR_NO_INFERIOR; + + if (!strcasecmp (args, "all")) { + resume_all_threads (from_tty); + return; + } + + saved_thread = current_thread; + + mid = parse_thread_id (args, 0, 0); + + if (mid < 0) + error ("You can resume only existing kernel threads with MID or @SLOTNUMBER"); + + if (mid == 0) + mid = map_port_name_to_mid (current_thread, MACH_TYPE_THREAD); + else + if (select_thread (inferior_task, mid, 0) != KERN_SUCCESS) + { + if (current_thread) + current_thread = saved_thread; + return_to_top_level (); + } + + ret = thread_info (current_thread, + THREAD_BASIC_INFO, + (thread_info_t) &th_info, + &infoCnt); + CHK ("resume can't get thread info", ret); + + if (! th_info.suspend_count) + { + message ("Thread %d is not suspended", mid); + goto out; + } + + ret = thread_resume (current_thread); + if (ret != KERN_SUCCESS) + message ("thread_resume failed : %s", + mach_error_string (ret)); + else + { + th_info.suspend_count--; + message ("Thread %d suspend count is %d", mid, th_info.suspend_count); + } + + out: + current_thread = saved_thread; +} + +void +thread_kill_command (args, from_tty) + char *args; + int from_tty; +{ + int mid; + kern_return_t ret; + int thread_count; + thread_array_t thread_table; + int index; + mach_port_t thread_to_kill = MACH_PORT_NULL; + + + MACH_ERROR_NO_INFERIOR; + + if (!args) + error_no_arg ("thread mid to kill from the inferior task"); + + mid = parse_thread_id (args, 0, 0); + + if (mid < 0) + error ("You can kill only existing kernel threads with MID or @SLOTNUMBER"); + + if (mid) + { + ret = machid_mach_port (mid_server, mid_auth, mid, &thread_to_kill); + CHK ("thread_kill_command: machid_mach_port map failed", ret); + } + else + mid = map_port_name_to_mid (current_thread, MACH_TYPE_THREAD); + + /* Don't allow gdb to kill *any* thread in the system. Use mkill program for that */ + ret = task_threads (inferior_task, &thread_table, &thread_count); + CHK ("Error getting inferior's thread list", ret); + + if (thread_to_kill == current_thread) + { + ret = thread_terminate (thread_to_kill); + CHK ("Thread could not be terminated", ret); + + if (select_thread (inferior_task, 0, 1) != KERN_SUCCESS) + message ("Last thread was killed, use \"kill\" command to kill task"); + } + else + for (index = 0; index < thread_count; index++) + if (thread_table [ index ] == thread_to_kill) + { + ret = thread_terminate (thread_to_kill); + CHK ("Thread could not be terminated", ret); + } + + if (thread_count > 1) + consume_send_rights (thread_table, thread_count); + + ret = vm_deallocate (mach_task_self(), (vm_address_t)thread_table, + (thread_count * sizeof(mach_port_t))); + CHK ("Error trying to deallocate thread list", ret); + + message ("Thread %d killed", mid); +} + + +/* Task specific commands; add more if you like */ + +void +task_resume_command (args, from_tty) + char *args; + int from_tty; +{ + kern_return_t ret; + task_basic_info_data_t ta_info; + int infoCnt = TASK_BASIC_INFO_COUNT; + int mid = map_port_name_to_mid (inferior_task, MACH_TYPE_TASK); + + MACH_ERROR_NO_INFERIOR; + + /* Would be trivial to change, but is it desirable? */ + if (args) + error ("Currently gdb can resume only it's inferior task"); + + ret = task_info (inferior_task, + TASK_BASIC_INFO, + (task_info_t) &ta_info, + &infoCnt); + CHK ("task_resume_command: task_info failed", ret); + + if (ta_info.suspend_count == 0) + error ("Inferior task %d is not suspended", mid); + else if (ta_info.suspend_count == 1 && + from_tty && + !query ("Suspend count is now 1. Do you know what you are doing? ")) + error ("Task not resumed"); + + ret = task_resume (inferior_task); + CHK ("task_resume_command: task_resume", ret); + + if (ta_info.suspend_count == 1) + { + message ("Inferior task %d is no longer suspended", mid); + must_suspend_thread = 1; + /* @@ This is not complete: Registers change all the time when not + suspended! */ + registers_changed (); + } + else + message ("Inferior task %d suspend count is now %d", + mid, ta_info.suspend_count-1); +} + + +void +task_suspend_command (args, from_tty) + char *args; + int from_tty; +{ + kern_return_t ret; + task_basic_info_data_t ta_info; + int infoCnt = TASK_BASIC_INFO_COUNT; + int mid = map_port_name_to_mid (inferior_task, MACH_TYPE_TASK); + + MACH_ERROR_NO_INFERIOR; + + /* Would be trivial to change, but is it desirable? */ + if (args) + error ("Currently gdb can suspend only it's inferior task"); + + ret = task_suspend (inferior_task); + CHK ("task_suspend_command: task_suspend", ret); + + must_suspend_thread = 0; + + ret = task_info (inferior_task, + TASK_BASIC_INFO, + (task_info_t) &ta_info, + &infoCnt); + CHK ("task_suspend_command: task_info failed", ret); + + message ("Inferior task %d suspend count is now %d", + mid, ta_info.suspend_count); +} + +private char * +get_size (bytes) + int bytes; +{ + static char size [ 30 ]; + int zz = bytes/1024; + + if (zz / 1024) + sprintf (size, "%-2.1f M", ((float)bytes)/(1024.0*1024.0)); + else + sprintf (size, "%d K", zz); + + return size; +} + +/* Does this require the target task to be suspended?? I don't think so. */ +void +task_info_command (args, from_tty) + char *args; + int from_tty; +{ + int mid = -5; + mach_port_t task; + kern_return_t ret; + task_basic_info_data_t ta_info; + int infoCnt = TASK_BASIC_INFO_COUNT; + int page_size = round_page(1); + int thread_count = 0; + + if (MACH_PORT_VALID (inferior_task)) + mid = map_port_name_to_mid (inferior_task, + MACH_TYPE_TASK); + + task = inferior_task; + + if (args) + { + int tmid = atoi (args); + + if (tmid <= 0) + error ("Invalid mid %d for task info", tmid); + + if (tmid != mid) + { + mid = tmid; + ret = machid_mach_port (mid_server, mid_auth, tmid, &task); + CHK ("task_info_command: machid_mach_port map failed", ret); + } + } + + if (mid < 0) + error ("You have to give the task MID as an argument"); + + ret = task_info (task, + TASK_BASIC_INFO, + (task_info_t) &ta_info, + &infoCnt); + CHK ("task_info_command: task_info failed", ret); + + printf_filtered ("\nTask info for task %d:\n\n", mid); + printf_filtered (" Suspend count : %d\n", ta_info.suspend_count); + printf_filtered (" Base priority : %d\n", ta_info.base_priority); + printf_filtered (" Virtual size : %s\n", get_size (ta_info.virtual_size)); + printf_filtered (" Resident size : %s\n", get_size (ta_info.resident_size)); + + { + thread_array_t thread_list; + + ret = task_threads (task, &thread_list, &thread_count); + CHK ("task_info_command: task_threads", ret); + + printf_filtered (" Thread count : %d\n", thread_count); + + consume_send_rights (thread_list, thread_count); + ret = vm_deallocate(mach_task_self(), + (vm_address_t)thread_list, + (thread_count * sizeof(int))); + CHK("Error trying to deallocate thread list", ret); + } + if (have_emulator_p (task)) + printf_filtered (" Emulator at : 0x%x..0x%x\n", + EMULATOR_BASE, EMULATOR_END); + else + printf_filtered (" No emulator.\n"); + + if (thread_count && task == inferior_task) + printf_filtered ("\nUse the \"thread list\" command to see the threads\n"); +} + +/* You may either FORWARD the exception to the inferior, or KEEP + * it and return to GDB command level. + * + * exception mid [ forward | keep ] + */ + +private void +exception_command (args, from_tty) + char *args; + int from_tty; +{ + char *scan = args; + int exception; + int len; + + if (!args) + error_no_arg ("exception number action"); + + while (*scan == ' ' || *scan == '\t') scan++; + + if ('0' <= *scan && *scan <= '9') + while ('0' <= *scan && *scan <= '9') + scan++; + else + error ("exception number action"); + + exception = atoi (args); + if (exception <= 0 || exception > MAX_EXCEPTION) + error ("Allowed exception numbers are in range 1..%d", + MAX_EXCEPTION); + + if (*scan != ' ' && *scan != '\t') + error ("exception number must be followed by a space"); + else + while (*scan == ' ' || *scan == '\t') scan++; + + args = scan; + len = 0; + while (*scan) + { + len++; + scan++; + } + + if (!len) + error("exception number action"); + + if (!strncasecmp (args, "forward", len)) + exception_map[ exception ].forward = TRUE; + else if (!strncasecmp (args, "keep", len)) + exception_map[ exception ].forward = FALSE; + else + error ("exception action is either \"keep\" or \"forward\""); +} + +private void +print_exception_info (exception) + int exception; +{ + boolean_t forward = exception_map[ exception ].forward; + + printf_filtered ("%s\t(%d): ", exception_map[ exception ].name, + exception); + if (!forward) + if (exception_map[ exception ].sigmap != SIG_UNKNOWN) + printf_filtered ("keep and handle as signal %d\n", + exception_map[ exception ].sigmap); + else + printf_filtered ("keep and handle as unknown signal %d\n", + exception_map[ exception ].sigmap); + else + printf_filtered ("forward exception to inferior\n"); +} + +void +exception_info (args, from_tty) + char *args; + int from_tty; +{ + int exception; + + if (!args) + for (exception = 1; exception <= MAX_EXCEPTION; exception++) + print_exception_info (exception); + else + { + exception = atoi (args); + + if (exception <= 0 || exception > MAX_EXCEPTION) + error ("Invalid exception number, values from 1 to %d allowed", + MAX_EXCEPTION); + print_exception_info (exception); + } +} + +/* Check for actions for mach exceptions. + */ +mach3_exception_actions (w, force_print_only, who) + WAITTYPE *w; + boolean_t force_print_only; + char *who; +{ + boolean_t force_print = FALSE; + + + if (force_print_only || + exception_map[stop_exception].sigmap == SIG_UNKNOWN) + force_print = TRUE; + else + WSETSTOP (*w, exception_map[stop_exception].sigmap); + + if (exception_map[stop_exception].print || force_print) + { + int giveback = grab_terminal (); + + printf_filtered ("\n%s received %s exception : ", + who, + exception_map[stop_exception].name); + + wrap_here (" "); + + switch(stop_exception) { + case EXC_BAD_ACCESS: + printf_filtered ("referencing address 0x%x : %s\n", + stop_subcode, + mach_error_string (stop_code)); + break; + case EXC_BAD_INSTRUCTION: + printf_filtered + ("illegal or undefined instruction. code %d subcode %d\n", + stop_code, stop_subcode); + break; + case EXC_ARITHMETIC: + printf_filtered ("code %d\n", stop_code); + break; + case EXC_EMULATION: + printf_filtered ("code %d subcode %d\n", stop_code, stop_subcode); + break; + case EXC_SOFTWARE: + printf_filtered ("%s specific, code 0x%x\n", + stop_code < 0xffff ? "hardware" : "os emulation", + stop_code); + break; + case EXC_BREAKPOINT: + printf_filtered ("type %d (machine dependent)\n", + stop_code); + break; + default: + fatal ("Unknown exception"); + } + + if (giveback) + terminal_inferior (); + } +} + +setup_notify_port (create_new) + int create_new; +{ + kern_return_t ret; + + if (MACH_PORT_VALID (our_notify_port)) + { + ret = mach_port_destroy (mach_task_self (), our_notify_port); + CHK ("Could not destroy our_notify_port", ret); + } + + our_notify_port = MACH_PORT_NULL; + notify_chain = (port_chain_t) NULL; + port_chain_destroy (port_chain_obstack); + + if (create_new) + { + ret = mach_port_allocate (mach_task_self(), + MACH_PORT_RIGHT_RECEIVE, + &our_notify_port); + if (ret != KERN_SUCCESS) + fatal("Creating notify port %s", mach_error_string(ret)); + + ret = mach_port_move_member(mach_task_self(), + our_notify_port, + inferior_wait_port_set); + if (ret != KERN_SUCCESS) + fatal("initial move member %s",mach_error_string(ret)); + } +} + +/* + * Register our message port to the net name server + * + * Currently used only by the external stop-gdb program + * since ^C does not work if you would like to enter + * gdb command level while debugging your program. + * + * NOTE: If the message port is sometimes used for other + * purposes also, the NAME must not be a guessable one. + * Then, there should be a way to change it. + */ + +char registered_name[ MAX_NAME_LEN ]; + +void +message_port_info (args, from_tty) + char *args; + int from_tty; +{ + if (registered_name[0]) + printf_filtered ("gdb's message port name: '%s'\n", + registered_name); + else + printf_filtered ("gdb's message port is not currently registered\n"); +} + +void +gdb_register_port (name, port) + char *name; + mach_port_t port; +{ + kern_return_t ret; + static int already_signed = 0; + int len; + + if (! MACH_PORT_VALID (port) || !name || !*name) + { + message ("Invalid registration request"); + return; + } + + if (! already_signed) + { + ret = mach_port_insert_right (mach_task_self (), + our_message_port, + our_message_port, + MACH_MSG_TYPE_MAKE_SEND); + CHK ("Failed to create a signature to our_message_port", ret); + already_signed = 1; + } + else if (already_signed > 1) + { + ret = netname_check_out (name_server_port, + registered_name, + our_message_port); + CHK ("Failed to check out gdb's message port", ret); + registered_name[0] = '\000'; + already_signed = 1; + } + + ret = netname_check_in (name_server_port, /* Name server port */ + name, /* Name of service */ + our_message_port, /* Signature */ + port); /* Creates a new send right */ + CHK("Failed to check in the port", ret); + + len = 0; + while(len < MAX_NAME_LEN && *(name+len)) + { + registered_name[len] = *(name+len); + len++; + } + registered_name[len] = '\000'; + already_signed = 2; +} + +struct cmd_list_element *cmd_thread_list; +struct cmd_list_element *cmd_task_list; + +/*ARGSUSED*/ +private void +thread_command (arg, from_tty) + char *arg; + int from_tty; +{ + printf ("\"thread\" must be followed by the name of a thread command.\n"); + help_list (cmd_thread_list, "thread ", -1, stdout); +} + +/*ARGSUSED*/ +private void +task_command (arg, from_tty) + char *arg; + int from_tty; +{ + printf ("\"task\" must be followed by the name of a task command.\n"); + help_list (cmd_task_list, "task ", -1, stdout); +} + +add_mach_specific_commands () +{ + extern void condition_thread (); + + /* Thread handling commands */ + + add_prefix_cmd ("thread", class_stack, thread_command, + "Generic command for handling threads in the debugged task.", + &cmd_thread_list, "thread ", 0, &cmdlist); + + add_com_alias ("th", "thread", class_stack, 1); + + add_cmd ("select", class_stack, thread_select_command, + "Select and print MID of the selected thread", + &cmd_thread_list); + add_cmd ("list", class_stack, thread_list_command, + "List info of task's threads. Selected thread is marked with '*'", + &cmd_thread_list); + add_cmd ("suspend", class_run, thread_suspend_command, + "Suspend one or all of the threads in the selected task.", + &cmd_thread_list); + add_cmd ("resume", class_run, thread_resume_command, + "Resume one or all of the threads in the selected task.", + &cmd_thread_list); + add_cmd ("kill", class_run, thread_kill_command, + "Kill the specified thread MID from inferior task.", + &cmd_thread_list); + add_cmd ("break", class_breakpoint, condition_thread, + "Breakpoint N will only be effective for thread MID or @SLOT\n\ + If MID/@SLOT is omitted allow all threads to break at breakpoint", + &cmd_thread_list); + /* Thread command shorthands (for backward compatibility) */ + add_alias_cmd ("ts", "thread select", 0, 0, &cmdlist); + add_alias_cmd ("tl", "thread list", 0, 0, &cmdlist); + + /* task handling commands */ + + add_prefix_cmd ("task", class_stack, task_command, + "Generic command for handling debugged task.", + &cmd_task_list, "task ", 0, &cmdlist); + + add_com_alias ("ta", "task", class_stack, 1); + + add_cmd ("suspend", class_run, task_suspend_command, + "Suspend the inferior task.", + &cmd_task_list); + add_cmd ("resume", class_run, task_resume_command, + "Resume the inferior task.", + &cmd_task_list); + add_cmd ("info", no_class, task_info_command, + "Print information about the specified task.", + &cmd_task_list); + + /* Print my message port name */ + + add_info ("message-port", message_port_info, + "Returns the name of gdb's message port in the netnameserver"); + + /* Exception commands */ + + add_info ("exceptions", exception_info, + "What debugger does when program gets various exceptions.\n\ +Specify an exception number as argument to print info on that\n\ +exception only."); + + add_com ("exception", class_run, exception_command, + "Specify how to handle an exception.\n\ +Args are exception number followed by \"forward\" or \"keep\".\n\ +`Forward' means forward the exception to the program's normal exception\n\ +handler.\n\ +`Keep' means reenter debugger if this exception happens, and GDB maps\n\ +the exception to some signal (see info exception)\n\ +Normally \"keep\" is used to return to GDB on exception."); +} + +void +_initialize_mach_os () +{ + kern_return_t ret; + + ret = mach_port_allocate(mach_task_self(), + MACH_PORT_RIGHT_PORT_SET, + &inferior_wait_port_set); + if (ret != KERN_SUCCESS) + fatal("initial port set %s",mach_error_string(ret)); + + /* mach_really_wait now waits for this */ + currently_waiting_for = inferior_wait_port_set; + + ret = netname_look_up(name_server_port, hostname, "MachID", &mid_server); + if (ret != KERN_SUCCESS) + { + mid_server = MACH_PORT_NULL; + + message ("initialize machid: netname_lookup_up(MachID) : %s", + mach_error_string(ret)); + message ("Some (most?) features disabled..."); + } + + mid_auth = mach_privileged_host_port(); + if (mid_auth == MACH_PORT_NULL) + mid_auth = mach_task_self(); + + obstack_init (port_chain_obstack); + + ret = mach_port_allocate (mach_task_self (), + MACH_PORT_RIGHT_RECEIVE, + &thread_exception_port); + CHK ("Creating thread_exception_port for single stepping", ret); + + ret = mach_port_insert_right (mach_task_self (), + thread_exception_port, + thread_exception_port, + MACH_MSG_TYPE_MAKE_SEND); + CHK ("Inserting send right to thread_exception_port", ret); + + /* Allocate message port */ + ret = mach_port_allocate (mach_task_self (), + MACH_PORT_RIGHT_RECEIVE, + &our_message_port); + if (ret != KERN_SUCCESS) + message ("Creating message port %s", mach_error_string (ret)); + else + { + char buf[ MAX_NAME_LEN ]; + ret = mach_port_move_member(mach_task_self (), + our_message_port, + inferior_wait_port_set); + if (ret != KERN_SUCCESS) + message ("message move member %s", mach_error_string (ret)); + + + /* @@@@ No way to change message port name currently */ + /* Foo. This assumes gdb has a unix pid */ + sprintf (buf, "gdb-%d", getpid ()); + gdb_register_port (buf, our_message_port); + } + + /* Heap for thread commands */ + obstack_init (cproc_obstack); + + add_mach_specific_commands (); +} + +kern_return_t +do_mach_notify_dead_name (notify, name) + mach_port_t notify; + mach_port_t name; +{ + kern_return_t kr = KERN_SUCCESS; + + /* Find the thing that notified */ + port_chain_t element = port_chain_member (notify_chain, name); + + /* Take name of from unreceived dead name notification list */ + notify_chain = port_chain_delete (notify_chain, name); + + if (! element) + error ("Received a dead name notify from unchained port (0x%x)", name); + + switch (element->type) { + + case MACH_TYPE_THREAD: + if (name == current_thread) + { + message ("\nCurrent thread %d died", element->mid); + current_thread = MACH_PORT_NULL; + } + else + message ("\nThread %d died", element->mid); + + break; + + case MACH_TYPE_TASK: + if (name != inferior_task) + message ("Task %d died, but it was not the selected task", + element->mid); + else + { + message ("Current task %d died", element->mid); + + mach_port_destroy (mach_task_self(), name); + inferior_task = MACH_PORT_NULL; + + if (notify_chain) + message("There were still unreceived dead_name_notifications???"); + + /* Destroy the old notifications */ + setup_notify_port (0); + + } + break; + + default: + error ("Unregistered dead_name 0x%x notification received. Type is %d, mid is 0x%x", + name, element->type, element->mid); + break; + } + + return KERN_SUCCESS; +} + +kern_return_t +do_mach_notify_msg_accepted (notify, name) + mach_port_t notify; + mach_port_t name; +{ + message ("do_mach_notify_msg_accepted : notify %x, name %x", + notify, name); + return KERN_SUCCESS; +} + +kern_return_t +do_mach_notify_no_senders (notify, mscount) + mach_port_t notify; + mach_port_mscount_t mscount; +{ + message ("do_mach_notify_no_senders : notify %x, mscount %x", + notify, mscount); + return KERN_SUCCESS; +} + +kern_return_t +do_mach_notify_port_deleted (notify, name) + mach_port_t notify; + mach_port_t name; +{ + message ("do_mach_notify_port_deleted : notify %x, name %x", + notify, name); + return KERN_SUCCESS; +} + +kern_return_t +do_mach_notify_port_destroyed (notify, rights) + mach_port_t notify; + mach_port_t rights; +{ + message ("do_mach_notify_port_destroyed : notify %x, rights %x", + notify, rights); + return KERN_SUCCESS; +} + +kern_return_t +do_mach_notify_send_once (notify) + mach_port_t notify; +{ +#ifdef DUMP_SYSCALL + /* MANY of these are generated. */ + message ("do_mach_notify_send_once : notify %x", + notify); +#endif + return KERN_SUCCESS; +} + +/* Kills the inferior. It's gone when you call this */ +void +kill_inferior_fast () +{ + WAITTYPE w; + + if (inferior_pid == 0 || inferior_pid == 1) + return; + + /* kill() it, since the Unix server does not otherwise notice when + * killed with task_terminate(). + */ + if (inferior_pid > 0) + kill (inferior_pid, SIGKILL); + + /* It's propably terminate already */ + (void) task_terminate (inferior_task); + + inferior_task = MACH_PORT_NULL; + current_thread = MACH_PORT_NULL; + + wait3 (&w, WNOHANG, 0); + + setup_notify_port (0); +} + +void +kill_inferior () +{ + kill_inferior_fast (); + target_mourn_inferior (); +} + + +/* Mach 3.0 does not need ptrace for anything + * Make sure nobody uses it on mach. + */ +ptrace (a,b,c,d) +int a,b,c,d; +{ + error ("Lose, Lose! Somebody called ptrace\n"); +} + +/* Resume execution of the inferior process. + If STEP is nonzero, single-step it. + If SIGNAL is nonzero, give it that signal. */ + +void +child_resume (step, signal) + int step; + int signal; +{ + kern_return_t ret; + + if (step) + { + thread_basic_info_data_t th_info; + unsigned int infoCnt = THREAD_BASIC_INFO_COUNT; + + /* There is no point in single stepping when current_thread + * is dead. + */ + if (! MACH_PORT_VALID (current_thread)) + error ("No thread selected; can not single step"); + + /* If current_thread is suspended, tracing it would never return. + */ + ret = thread_info (current_thread, + THREAD_BASIC_INFO, + (thread_info_t) &th_info, + &infoCnt); + CHK ("child_resume: can't get thread info", ret); + + if (th_info.suspend_count) + error ("Can't trace a suspended thread. Use \"thread resume\" command to resume it"); + } + + vm_read_cache_valid = FALSE; + + if (signal && inferior_pid > 0) /* Do not signal, if attached by MID */ + kill (inferior_pid, signal); + + if (step) + { + suspend_all_threads (0); + + setup_single_step (current_thread, TRUE); + + ret = thread_resume (current_thread); + CHK ("thread_resume", ret); + } + + ret = task_resume (inferior_task); + if (ret == KERN_FAILURE) + message ("Task was not suspended"); + else + CHK ("Resuming task", ret); + + /* HACK HACK This is needed by the multiserver system HACK HACK */ + while ((ret = task_resume(inferior_task)) == KERN_SUCCESS) + /* make sure it really runs */; + /* HACK HACK This is needed by the multiserver system HACK HACK */ +} + +#ifdef ATTACH_DETACH + +/* Start debugging the process with the given task */ +void +task_attach (tid) + task_t tid; +{ + kern_return_t ret; + inferior_task = tid; + + ret = task_suspend (inferior_task); + CHK("task_attach: task_suspend", ret); + + must_suspend_thread = 0; + + setup_notify_port (1); + + request_notify (inferior_task, MACH_NOTIFY_DEAD_NAME, MACH_TYPE_TASK); + + setup_exception_port (); + + emulator_present = have_emulator_p (inferior_task); + + attach_flag = 1; +} + +/* Well, we can call error also here and leave the + * target stack inconsistent. Sigh. + * Fix this sometime (the only way to fail here is that + * the task has no threads at all, which is rare, but + * possible; or if the target task has died, which is also + * possible, but unlikely, since it has been suspended. + * (Someone must have killed it)) + */ +void +attach_to_thread () +{ + if (select_thread (inferior_task, 0, 1) != KERN_SUCCESS) + error ("Could not select any threads to attach to"); +} + +mid_attach (mid) + int mid; +{ + kern_return_t ret; + + ret = machid_mach_port (mid_server, mid_auth, mid, &inferior_task); + CHK("mid_attach: machid_mach_port", ret); + + task_attach (inferior_task); + + return mid; +} + +/* + * Start debugging the process whose unix process-id is PID. + * A negative "pid" value is legal and signifies a mach_id not a unix pid. + * + * Prevent (possible unwanted) dangerous operations by enabled users + * like "atta 0" or "atta foo" (equal to the previous :-) and + * "atta pidself". Anyway, the latter is allowed by specifying a MID. + */ +attach (pid) + int pid; +{ + kern_return_t ret; + + if (pid == 0) + error("MID=0, Debugging the master unix server does not compute"); + + /* Foo. This assumes gdb has a unix pid */ + if (pid == getpid()) + error ("I will debug myself only by mid. (Gdb would suspend itself!)"); + + if (pid < 0) + { + mid_attach (-(pid)); + + /* inferior_pid will be NEGATIVE! */ + inferior_pid = pid; + + return inferior_pid; + } + + inferior_task = task_by_pid (pid); + if (! MACH_PORT_VALID (inferior_task)) + error("Cannot map Unix pid %d to Mach task port", pid); + + task_attach (inferior_task); + + inferior_pid = pid; + + return inferior_pid; +} + +void +deallocate_inferior_ports () +{ + kern_return_t ret; + thread_array_t thread_list; + int thread_count, index; + + if (!MACH_PORT_VALID (inferior_task)) + return; + + ret = task_threads (inferior_task, &thread_list, &thread_count); + if (ret != KERN_SUCCESS) + { + message ("deallocate_inferior_ports: task_threads", + mach_error_string(ret)); + return; + } + + /* Get rid of send rights to task threads */ + for (index = 0; index < thread_count; index++) + { + int rights; + ret = mach_port_get_refs (mach_task_self (), + thread_list[index], + MACH_PORT_RIGHT_SEND, + &rights); + CHK("deallocate_inferior_ports: get refs", ret); + + if (rights > 0) + { + ret = mach_port_mod_refs (mach_task_self (), + thread_list[index], + MACH_PORT_RIGHT_SEND, + -rights); + CHK("deallocate_inferior_ports: mod refs", ret); + } + } + + ret = mach_port_mod_refs (mach_task_self (), + inferior_exception_port, + MACH_PORT_RIGHT_RECEIVE, + -1); + CHK ("deallocate_inferior_ports: cannot get rid of exception port", ret); + + ret = mach_port_deallocate (mach_task_self (), + inferior_task); + CHK ("deallocate_task_port: deallocating inferior_task", ret); + + current_thread = MACH_PORT_NULL; + inferior_task = MACH_PORT_NULL; +} + +/* Stop debugging the process whose number is PID + and continue it with signal number SIGNAL. + SIGNAL = 0 means just continue it. */ + +void +detach (signal) + int signal; +{ + kern_return_t ret; + + MACH_ERROR_NO_INFERIOR; + + if (current_thread != MACH_PORT_NULL) + { + /* Store the gdb's view of the thread we are deselecting + * before we detach. + * @@ I am really not sure if this is ever needeed. + */ + target_prepare_to_store (); + target_store_registers (-1); + } + + ret = task_set_special_port (inferior_task, + TASK_EXCEPTION_PORT, + inferior_old_exception_port); + CHK ("task_set_special_port", ret); + + /* Discard all requested notifications */ + setup_notify_port (0); + + if (remove_breakpoints ()) + message ("Could not remove breakpoints when detaching"); + + if (signal && inferior_pid > 0) + kill (inferior_pid, signal); + + /* the task might be dead by now */ + (void) task_resume (inferior_task); + + deallocate_inferior_ports (); + + attach_flag = 0; +} +#endif /* ATTACH_DETACH */ + +#ifdef DUMP_SYSCALL +#ifdef __STDC__ +#define STR(x) #x +#else +#define STR(x) "x" +#endif + +char *bsd1_names[] = { + "execve", + "fork", + "take_signal", + "sigreturn", + "getrusage", + "chdir", + "chroot", + "open", + "creat", + "mknod", + "link", + "symlink", + "unlink", + "access", + "stat", + "readlink", + "chmod", + "chown", + "utimes", + "truncate", + "rename", + "mkdir", + "rmdir", + "xutimes", + "mount", + "umount", + "acct", + "setquota", + "write_short", + "write_long", + "send_short", + "send_long", + "sendto_short", + "sendto_long", + "select", + "task_by_pid", + "recvfrom_short", + "recvfrom_long", + "setgroups", + "setrlimit", + "sigvec", + "sigstack", + "settimeofday", + "adjtime", + "setitimer", + "sethostname", + "bind", + "accept", + "connect", + "setsockopt", + "getsockopt", + "getsockname", + "getpeername", + "init_process", + "table_set", + "table_get", + "pioctl", + "emulator_error", + "readwrite", + "share_wakeup", + 0, + "maprw_request_it", + "maprw_release_it", + "maprw_remap", + "pid_by_task", +}; + +int bsd1_nnames = sizeof(bsd1_names)/sizeof(bsd1_names[0]); + +char* +name_str(name,buf) + +int name; +char *buf; + +{ + switch (name) { + case MACH_MSG_TYPE_BOOLEAN: + return "boolean"; + case MACH_MSG_TYPE_INTEGER_16: + return "short"; + case MACH_MSG_TYPE_INTEGER_32: + return "long"; + case MACH_MSG_TYPE_CHAR: + return "char"; + case MACH_MSG_TYPE_BYTE: + return "byte"; + case MACH_MSG_TYPE_REAL: + return "real"; + case MACH_MSG_TYPE_STRING: + return "string"; + default: + sprintf(buf,"%d",name); + return buf; + } +} + +char * +id_str(id,buf) + +int id; +char *buf; + +{ + char *p; + if (id >= 101000 && id < 101000+bsd1_nnames) { + if (p = bsd1_names[id-101000]) + return p; + } + if (id == 102000) + return "psignal_retry"; + if (id == 100000) + return "syscall"; + sprintf(buf,"%d",id); + return buf; +} + +print_msg(mp) +mach_msg_header_t *mp; +{ + char *fmt_x = "%20s : 0x%08x\n"; + char *fmt_d = "%20s : %10d\n"; + char *fmt_s = "%20s : %s\n"; + char buf[100]; + + puts_filtered ("\n"); +#define pr(fmt,h,x) printf_filtered(fmt,STR(x),(h).x) + pr(fmt_x,(*mp),msgh_bits); + pr(fmt_d,(*mp),msgh_size); + pr(fmt_x,(*mp),msgh_remote_port); + pr(fmt_x,(*mp),msgh_local_port); + pr(fmt_d,(*mp),msgh_kind); + printf_filtered(fmt_s,STR(msgh_id),id_str(mp->msgh_id,buf)); + + if (debug_level > 1) + { + char *p,*ep,*dp; + int plen; + p = (char*)mp; + ep = p+mp->msgh_size; + p += sizeof(*mp); + for(; p < ep; p += plen) { + mach_msg_type_t *tp; + mach_msg_type_long_t *tlp; + int name,size,number; + tp = (mach_msg_type_t*)p; + if (tp->msgt_longform) { + tlp = (mach_msg_type_long_t*)tp; + name = tlp->msgtl_name; + size = tlp->msgtl_size; + number = tlp->msgtl_number; + plen = sizeof(*tlp); + } else { + name = tp->msgt_name; + size = tp->msgt_size; + number = tp->msgt_number; + plen = sizeof(*tp); + } + printf_filtered("name=%-16s size=%2d number=%7d inline=%d long=%d deal=%d\n", + name_str(name,buf),size,number,tp->msgt_inline, + tp->msgt_longform, tp->msgt_deallocate); + dp = p+plen; + if (tp->msgt_inline) { + int l; + l = size*number/8; + l = (l+sizeof(long)-1)&~((sizeof(long))-1); + plen += l; + print_data(dp,size,number); + } else { + plen += sizeof(int*); + } + printf_filtered("plen=%d\n",plen); + } + } +} + +print_data(p,size,number) + +char *p; + +{ + int *ip; + short *sp; + int i; + + switch (size) { + case 8: + for(i = 0; i < number; i++) { + printf_filtered(" %02x",p[i]); + } + break; + case 16: + sp = (short*)p; + for(i = 0; i < number; i++) { + printf_filtered(" %04x",sp[i]); + } + break; + case 32: + ip = (int*)p; + for(i = 0; i < number; i++) { + printf_filtered(" %08x",ip[i]); + } + break; + } + puts_filtered("\n"); +} +#endif DUMP_SYSCALL |