[23] | 1 | /* |
---|
[416] | 2 | * sys_kill.c - Kernel function implementing the "kill" system call. |
---|
[23] | 3 | * |
---|
| 4 | * Author Alain Greiner (2016,2017) |
---|
| 5 | * |
---|
| 6 | * Copyright (c) UPMC Sorbonne Universites |
---|
| 7 | * |
---|
| 8 | * This file is part of ALMOS-MKH. |
---|
| 9 | * |
---|
| 10 | * ALMOS-MKH is free software; you can redistribute it and/or modify it |
---|
| 11 | * under the terms of the GNU General Public License as published by |
---|
| 12 | * the Free Software Foundation; version 2.0 of the License. |
---|
| 13 | * |
---|
| 14 | * ALMOS-MKH is distributed in the hope that it will be useful, but |
---|
| 15 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
---|
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
---|
| 17 | * General Public License for more details. |
---|
| 18 | * |
---|
| 19 | * You should have received a copy of the GNU General Public License |
---|
| 20 | * along with ALMOS-MKH; if not, write to the Free Software Foundation, |
---|
| 21 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
---|
| 22 | */ |
---|
| 23 | |
---|
| 24 | #include <kernel_config.h> |
---|
| 25 | #include <hal_types.h> |
---|
[409] | 26 | #include <hal_irqmask.h> |
---|
[23] | 27 | #include <errno.h> |
---|
| 28 | #include <thread.h> |
---|
| 29 | #include <printk.h> |
---|
| 30 | #include <process.h> |
---|
[416] | 31 | #include <shared_syscalls.h> |
---|
[23] | 32 | #include <cluster.h> |
---|
| 33 | #include <rpc.h> |
---|
| 34 | |
---|
| 35 | /////////////////////////// |
---|
| 36 | int sys_kill( pid_t pid, |
---|
| 37 | uint32_t sig_id ) |
---|
| 38 | { |
---|
[409] | 39 | uint32_t save_sr; // required to enable IRQs |
---|
[433] | 40 | xptr_t owner_xp; // extended pointer on target reference process |
---|
| 41 | cxy_t owner_cxy; // target process cluster |
---|
| 42 | process_t * owner_ptr; // local pointer on target process |
---|
[421] | 43 | xptr_t parent_xp; // extended pointer on parent process |
---|
| 44 | cxy_t parent_cxy; // parent process cluster |
---|
| 45 | process_t * parent_ptr; // local pointer on parent process |
---|
| 46 | pid_t ppid; // parent process PID |
---|
[433] | 47 | uint32_t retval; // return value for the switch |
---|
[409] | 48 | |
---|
[416] | 49 | thread_t * this = CURRENT_THREAD; |
---|
[435] | 50 | process_t * process = this->process; |
---|
[416] | 51 | |
---|
[433] | 52 | #if CONFIG_DEBUG_SYS_KILL |
---|
[409] | 53 | uint64_t tm_start; |
---|
| 54 | uint64_t tm_end; |
---|
| 55 | tm_start = hal_get_cycles(); |
---|
[433] | 56 | if( CONFIG_DEBUG_SYS_KILL < tm_start ) |
---|
| 57 | printk("\n[DBG] %s : thread %x enter / process %x / sig %d / cycle %d\n", |
---|
| 58 | __FUNCTION__ , this, pid, sig_id, (uint32_t)tm_start ); |
---|
[409] | 59 | #endif |
---|
| 60 | |
---|
[435] | 61 | // process cannot kill itself |
---|
| 62 | if( pid == process->pid ) |
---|
| 63 | { |
---|
| 64 | |
---|
| 65 | #if CONFIG_DEBUG_SYSCALLS_ERROR |
---|
| 66 | printk("\n[ERROR] in %s : process %d cannot kill itself\n", __FUNCTION__ , pid ); |
---|
| 67 | #endif |
---|
| 68 | this->errno = EINVAL; |
---|
| 69 | return -1; |
---|
| 70 | } |
---|
| 71 | |
---|
| 72 | // get cluster and pointers on owner target process descriptor |
---|
[433] | 73 | owner_xp = cluster_get_owner_process_from_pid( pid ); |
---|
| 74 | owner_cxy = GET_CXY( owner_xp ); |
---|
| 75 | owner_ptr = GET_PTR( owner_xp ); |
---|
[23] | 76 | |
---|
[421] | 77 | // check process existence |
---|
[433] | 78 | if( owner_xp == XPTR_NULL ) |
---|
[23] | 79 | { |
---|
[433] | 80 | |
---|
[435] | 81 | #if CONFIG_DEBUG_SYSCALLS_ERROR |
---|
| 82 | printk("\n[ERROR] in %s : process %x not found\n", __FUNCTION__ , pid ); |
---|
| 83 | #endif |
---|
[421] | 84 | this->errno = EINVAL; |
---|
| 85 | return -1; |
---|
| 86 | } |
---|
| 87 | |
---|
| 88 | // get parent process PID |
---|
[433] | 89 | parent_xp = hal_remote_lwd( XPTR( owner_cxy , &owner_ptr->parent_xp ) ); |
---|
[421] | 90 | parent_cxy = GET_CXY( parent_xp ); |
---|
| 91 | parent_ptr = GET_PTR( parent_xp ); |
---|
| 92 | ppid = hal_remote_lw( XPTR( parent_cxy , &parent_ptr->pid ) ); |
---|
| 93 | |
---|
[435] | 94 | // processes INIT |
---|
| 95 | if( pid == 1 ) |
---|
[421] | 96 | { |
---|
[23] | 97 | |
---|
[435] | 98 | #if CONFIG_DEBUG_SYSCALLS_ERROR |
---|
| 99 | printk("\n[ERROR] in %s : process_init cannot be killed\n", __FUNCTION__ ); |
---|
| 100 | #endif |
---|
[409] | 101 | this->errno = EINVAL; |
---|
| 102 | return -1; |
---|
| 103 | } |
---|
[23] | 104 | |
---|
[409] | 105 | // enable IRQs |
---|
| 106 | hal_enable_irq( &save_sr ); |
---|
[23] | 107 | |
---|
[435] | 108 | // analyse signal type / supported values are : 0, SIGSTOP, SIGCONT, SIGKILL |
---|
[433] | 109 | switch( sig_id ) |
---|
[23] | 110 | { |
---|
[433] | 111 | case 0 : |
---|
| 112 | { |
---|
| 113 | // does nothing |
---|
| 114 | retval = 0; |
---|
| 115 | break; |
---|
| 116 | } |
---|
| 117 | case SIGSTOP: |
---|
| 118 | { |
---|
| 119 | // remove TXT ownership from target process |
---|
| 120 | process_txt_reset_ownership( owner_xp ); |
---|
| 121 | |
---|
| 122 | // block all threads in all clusters |
---|
[435] | 123 | process_sigaction( pid , BLOCK_ALL_THREADS ); |
---|
[433] | 124 | |
---|
[435] | 125 | // atomically update owner process termination state |
---|
[433] | 126 | hal_remote_atomic_or( XPTR( owner_cxy , &owner_ptr->term_state ) , |
---|
[435] | 127 | PROCESS_TERM_STOP ); |
---|
[433] | 128 | |
---|
| 129 | retval = 0; |
---|
| 130 | break; |
---|
| 131 | } |
---|
| 132 | case SIGCONT: |
---|
| 133 | { |
---|
| 134 | // unblock all threads in all clusters |
---|
[435] | 135 | process_sigaction( pid , UNBLOCK_ALL_THREADS ); |
---|
[433] | 136 | |
---|
| 137 | // atomically update reference process termination state |
---|
| 138 | hal_remote_atomic_and( XPTR( owner_cxy , &owner_ptr->term_state ) , |
---|
[435] | 139 | ~PROCESS_TERM_STOP ); |
---|
[433] | 140 | retval = 0; |
---|
| 141 | break; |
---|
| 142 | } |
---|
| 143 | break; |
---|
| 144 | case SIGKILL: |
---|
| 145 | { |
---|
[435] | 146 | // remove TXT ownership from owner process descriptor |
---|
| 147 | process_txt_reset_ownership( owner_xp ); |
---|
[433] | 148 | |
---|
[435] | 149 | // block all process threads in all clusters |
---|
| 150 | process_sigaction( pid , BLOCK_ALL_THREADS ); |
---|
| 151 | |
---|
| 152 | // mark all process threads in all clusters for delete |
---|
| 153 | process_sigaction( pid , DELETE_ALL_THREADS ); |
---|
| 154 | |
---|
| 155 | // atomically update owner process descriptor flags |
---|
| 156 | hal_remote_atomic_or( XPTR( owner_cxy , &owner_ptr->term_state ) , |
---|
| 157 | PROCESS_TERM_KILL ); |
---|
| 158 | |
---|
[433] | 159 | retval = 0; |
---|
| 160 | break; |
---|
| 161 | } |
---|
| 162 | default: |
---|
| 163 | { |
---|
| 164 | |
---|
[435] | 165 | #if CONFIG_DEBUG_SYSCALLS_ERROR |
---|
| 166 | printk("\n[ERROR] in %s : illegal signal %d / process %x\n", __FUNCTION__, sig_id, pid ); |
---|
| 167 | #endif |
---|
[433] | 168 | this->errno = EINVAL; |
---|
| 169 | retval = -1; |
---|
| 170 | break; |
---|
| 171 | } |
---|
[23] | 172 | } |
---|
[433] | 173 | |
---|
[409] | 174 | // restore IRQs |
---|
| 175 | hal_restore_irq( save_sr ); |
---|
[23] | 176 | |
---|
[124] | 177 | hal_fence(); |
---|
[23] | 178 | |
---|
[433] | 179 | #if CONFIG_DEBUG_SYS_KILL |
---|
[409] | 180 | tm_end = hal_get_cycles(); |
---|
[433] | 181 | if( CONFIG_DEBUG_SYS_KILL < tm_end ) |
---|
| 182 | printk("\n[DBG] %s : thread %x enter / process %x / sig %d / cost = %d / cycle %d\n", |
---|
| 183 | __FUNCTION__ , this, pid, sig_id, (uint32_t)(tm_end - tm_start), (uint32_t)tm_end ); |
---|
[409] | 184 | #endif |
---|
[23] | 185 | |
---|
[433] | 186 | return retval; |
---|
| 187 | |
---|
[23] | 188 | } // end sys_kill() |
---|
| 189 | |
---|