| 1 | /*
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| 2 | * sys_kill.c - Kernel function implementing the "kill" system call.
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| 3 | *
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| 4 | * Author Alain Greiner (2016,2017,2018)
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| 5 | *
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| 6 | * Copyright (c) UPMC Sorbonne Universites
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| 7 | *
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| 8 | * This file is part of ALMOS-MKH.
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| 9 | *
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| 10 | * ALMOS-MKH is free software; you can redistribute it and/or modify it
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| 11 | * under the terms of the GNU General Public License as published by
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| 12 | * the Free Software Foundation; version 2.0 of the License.
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| 13 | *
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| 14 | * ALMOS-MKH is distributed in the hope that it will be useful, but
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| 15 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 17 | * General Public License for more details.
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| 18 | *
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| 19 | * You should have received a copy of the GNU General Public License
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| 20 | * along with ALMOS-MKH; if not, write to the Free Software Foundation,
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| 21 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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| 22 | */
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| 23 |
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| 24 | #include <kernel_config.h>
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| 25 | #include <hal_kernel_types.h>
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| 26 | #include <hal_irqmask.h>
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| 27 | #include <errno.h>
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| 28 | #include <thread.h>
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| 29 | #include <printk.h>
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| 30 | #include <process.h>
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| 31 | #include <shared_syscalls.h>
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| 32 | #include <cluster.h>
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| 33 | #include <rpc.h>
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| 34 |
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| 35 | #include <syscalls.h>
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| 36 |
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| 37 | ///////////////////////////
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| 38 | int sys_kill( pid_t pid,
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| 39 | uint32_t sig_id )
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| 40 | {
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| 41 | reg_t save_sr; // required to enable IRQs
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| 42 | xptr_t owner_xp; // extended pointer on process in owner cluster
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| 43 | cxy_t owner_cxy; // process owner cluster
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| 44 | process_t * owner_ptr; // local pointer on process in owner cluster
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| 45 | uint32_t retval; // return value for the switch
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| 46 | xptr_t parent_xp; // extended pointer on parent process
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| 47 | cxy_t parent_cxy; // parent process cluster
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| 48 | process_t * parent_ptr; // local pointer on parent process
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| 49 | thread_t * parent_main_ptr; // local pointer on parent main thread
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| 50 | xptr_t parent_main_xp; // extended pointer on parent main thread
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| 51 |
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| 52 | thread_t * this = CURRENT_THREAD;
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| 53 | process_t * process = this->process;
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| 54 |
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| 55 | #if DEBUG_SYS_KILL
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| 56 | uint64_t tm_start;
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| 57 | uint64_t tm_end;
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| 58 | tm_start = hal_get_cycles();
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| 59 | if( DEBUG_SYS_KILL < tm_start )
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| 60 | printk("\n[DBG] %s : thread %x enter / process %x / sig %d / cycle %d\n",
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| 61 | __FUNCTION__ , this, pid, sig_id, (uint32_t)tm_start );
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| 62 | #endif
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| 63 |
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| 64 | // get pointers on process descriptor in owner cluster
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| 65 | owner_xp = cluster_get_owner_process_from_pid( pid );
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| 66 | owner_cxy = GET_CXY( owner_xp );
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| 67 | owner_ptr = GET_PTR( owner_xp );
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| 68 |
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| 69 | #if (DEBUG_SYS_KILL & 1)
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| 70 | if( DEBUG_SYS_KILL < tm_start )
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| 71 | printk("\n[DBG] %s : thread %x get owner process %x in cluster %x\n",
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| 72 | __FUNCTION__ , this, owner_ptr, owner_cxy );
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| 73 | #endif
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| 74 |
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| 75 | // check process found
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| 76 | if( owner_xp == XPTR_NULL)
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| 77 | {
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| 78 |
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| 79 | #if DEBUG_SYSCALLS_ERROR
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| 80 | printk("\n[ERROR] in %s : process %x not found\n", __FUNCTION__, pid );
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| 81 | #endif
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| 82 | this->errno = EINVAL;
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| 83 | return -1;
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| 84 | }
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| 85 |
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| 86 | // process cannot kill itself
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| 87 | if( (pid == process->pid) )
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| 88 | {
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| 89 |
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| 90 | #if DEBUG_SYSCALLS_ERROR
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| 91 | printk("\n[ERROR] in %s : process %x cannot kill itself\n", __FUNCTION__, pid );
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| 92 | #endif
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| 93 | this->errno = EINVAL;
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| 94 | return -1;
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| 95 | }
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| 96 |
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| 97 | // processe INIT cannot be killed
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| 98 | if( pid == 1 )
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| 99 | {
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| 100 |
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| 101 | #if DEBUG_SYSCALLS_ERROR
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| 102 | printk("\n[ERROR] in %s : process_init cannot be killed\n", __FUNCTION__ );
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| 103 | #endif
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| 104 | this->errno = EINVAL;
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| 105 | return -1;
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| 106 | }
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| 107 |
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| 108 | // get parent process descriptor pointers
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| 109 | parent_xp = (xptr_t)hal_remote_l64( XPTR( owner_cxy , &owner_ptr->parent_xp ) );
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| 110 | parent_cxy = GET_CXY( parent_xp );
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| 111 | parent_ptr = GET_PTR( parent_xp );
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| 112 |
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| 113 | #if (DEBUG_SYS_KILL & 1)
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| 114 | if( DEBUG_SYS_KILL < tm_start )
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| 115 | printk("\n[DBG] %s : thread %x get parent process %x in cluster %x\n",
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| 116 | __FUNCTION__ , this, parent_ptr, parent_cxy );
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| 117 | #endif
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| 118 |
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| 119 | // get pointers on the parent process main thread
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| 120 | parent_main_ptr = hal_remote_lpt( XPTR( parent_cxy , &parent_ptr->th_tbl[0] ) );
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| 121 | parent_main_xp = XPTR( parent_cxy , parent_main_ptr );
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| 122 |
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| 123 | // analyse signal type / supported values are : 0, SIGSTOP, SIGCONT, SIGKILL
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| 124 | switch( sig_id )
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| 125 | {
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| 126 | case 0 : // does nothing
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| 127 | {
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| 128 | retval = 0;
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| 129 | break;
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| 130 | }
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| 131 | case SIGSTOP: // block all target process threads
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| 132 | {
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| 133 | // transfer TXT ownership
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| 134 | process_txt_transfer_ownership( owner_xp );
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| 135 |
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| 136 | // block all threads in all clusters, but the main thread
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| 137 | process_sigaction( pid , BLOCK_ALL_THREADS );
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| 138 |
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| 139 | // block the main thread
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| 140 | xptr_t main_xp = XPTR( owner_cxy , &owner_ptr->th_tbl[0] );
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| 141 | thread_block( main_xp , THREAD_BLOCKED_GLOBAL );
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| 142 |
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| 143 | // atomically update owner process termination state
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| 144 | hal_remote_atomic_or( XPTR( owner_cxy , &owner_ptr->term_state ) ,
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| 145 | PROCESS_TERM_STOP );
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| 146 |
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| 147 | // unblock the parent process main thread
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| 148 | thread_unblock( parent_main_xp , THREAD_BLOCKED_WAIT );
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| 149 |
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| 150 | retval = 0;
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| 151 | break;
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| 152 | }
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| 153 | case SIGCONT: // unblock all target process threads
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| 154 | {
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| 155 | // unblock all threads in all clusters
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| 156 | process_sigaction( pid , UNBLOCK_ALL_THREADS );
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| 157 |
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| 158 | // atomically update owner process termination state
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| 159 | hal_remote_atomic_and( XPTR( owner_cxy , &owner_ptr->term_state ) ,
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| 160 | ~PROCESS_TERM_STOP );
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| 161 | retval = 0;
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| 162 | break;
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| 163 | }
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| 164 | break;
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| 165 | case SIGKILL:
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| 166 | {
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| 167 | // remove process from TXT list
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| 168 | process_txt_detach( owner_xp );
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| 169 |
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| 170 | // mark for delete all threads in all clusters, but the main
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| 171 | hal_enable_irq( &save_sr );
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| 172 | process_sigaction( pid , DELETE_ALL_THREADS );
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| 173 | hal_restore_irq( save_sr );
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| 174 |
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| 175 | // block main thread
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| 176 | xptr_t main_xp = XPTR( owner_cxy , &owner_ptr->th_tbl[0] );
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| 177 | thread_block( main_xp , THREAD_BLOCKED_GLOBAL );
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| 178 |
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| 179 | // atomically update owner process descriptor term_state to ask
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| 180 | // the parent process sys_wait() function to delete this main thread
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| 181 | hal_remote_atomic_or( XPTR( owner_cxy , &owner_ptr->term_state ) ,
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| 182 | PROCESS_TERM_KILL );
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| 183 |
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| 184 | // unblock the parent process main thread
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| 185 | thread_unblock( parent_main_xp , THREAD_BLOCKED_WAIT );
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| 186 |
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| 187 | retval = 0;
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| 188 | break;
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| 189 | }
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| 190 | default:
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| 191 | {
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| 192 |
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| 193 | #if DEBUG_SYSCALLS_ERROR
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| 194 | printk("\n[ERROR] in %s : illegal signal %d / process %x\n", __FUNCTION__, sig_id, pid );
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| 195 | #endif
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| 196 | this->errno = EINVAL;
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| 197 | retval = -1;
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| 198 | break;
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| 199 | }
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| 200 | }
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| 201 |
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| 202 | hal_fence();
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| 203 |
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| 204 | #if DEBUG_SYS_KILL
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| 205 | tm_end = hal_get_cycles();
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| 206 | if( DEBUG_SYS_KILL < tm_end )
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| 207 | printk("\n[DBG] %s : thread %x exit / process %x / sig %d / cost = %d / cycle %d\n",
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| 208 | __FUNCTION__ , this, pid, sig_id, (uint32_t)(tm_end - tm_start), (uint32_t)tm_end );
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| 209 | #endif
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| 210 |
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| 211 | return retval;
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| 212 |
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| 213 | } // end sys_kill()
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| 214 |
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