Subversion Repositories HelenOS

Compare Revisions

Ignore whitespace Rev 4054 → Rev 4055

/branches/dd/kernel/generic/src/proc/scheduler.c
451,8 → 451,8
/*
* Entering state is unexpected.
*/
panic("tid%llu: unexpected state %s\n", THREAD->tid,
thread_states[THREAD->state]);
panic("tid%" PRIu64 ": unexpected state %s.",
THREAD->tid, thread_states[THREAD->state]);
break;
}
 
504,9 → 504,9
THREAD->state = Running;
 
#ifdef SCHEDULER_VERBOSE
printf("cpu%d: tid %llu (priority=%d, ticks=%llu, nrdy=%ld)\n",
CPU->id, THREAD->tid, THREAD->priority, THREAD->ticks,
atomic_get(&CPU->nrdy));
printf("cpu%u: tid %" PRIu64 " (priority=%d, ticks=%" PRIu64
", nrdy=%ld)\n", CPU->id, THREAD->tid, THREAD->priority,
THREAD->ticks, atomic_get(&CPU->nrdy));
#endif
 
/*
640,9 → 640,9
*/
spinlock_lock(&t->lock);
#ifdef KCPULB_VERBOSE
printf("kcpulb%d: TID %llu -> cpu%d, nrdy=%ld, "
"avg=%nd\n", CPU->id, t->tid, CPU->id,
atomic_get(&CPU->nrdy),
printf("kcpulb%u: TID %" PRIu64 " -> cpu%u, "
"nrdy=%ld, avg=%ld\n", CPU->id, t->tid,
CPU->id, atomic_get(&CPU->nrdy),
atomic_get(&nrdy) / config.cpu_active);
#endif
t->flags |= THREAD_FLAG_STOLEN;
708,7 → 708,7
continue;
 
spinlock_lock(&cpus[cpu].lock);
printf("cpu%d: address=%p, nrdy=%ld, needs_relink=%ld\n",
printf("cpu%u: address=%p, nrdy=%ld, needs_relink=%" PRIc "\n",
cpus[cpu].id, &cpus[cpu], atomic_get(&cpus[cpu].nrdy),
cpus[cpu].needs_relink);
719,11 → 719,11
spinlock_unlock(&r->lock);
continue;
}
printf("\trq[%d]: ", i);
printf("\trq[%u]: ", i);
for (cur = r->rq_head.next; cur != &r->rq_head;
cur = cur->next) {
t = list_get_instance(cur, thread_t, rq_link);
printf("%llu(%s) ", t->tid,
printf("%" PRIu64 "(%s) ", t->tid,
thread_states[t->state]);
}
printf("\n");
/branches/dd/kernel/generic/src/proc/task.c
35,10 → 35,8
* @brief Task management.
*/
 
#include <main/uinit.h>
#include <proc/thread.h>
#include <proc/task.h>
#include <proc/uarg.h>
#include <mm/as.h>
#include <mm/slab.h>
#include <atomic.h>
45,23 → 43,18
#include <synch/spinlock.h>
#include <synch/waitq.h>
#include <arch.h>
#include <panic.h>
#include <arch/barrier.h>
#include <adt/avl.h>
#include <adt/btree.h>
#include <adt/list.h>
#include <ipc/ipc.h>
#include <security/cap.h>
#include <memstr.h>
#include <ipc/ipcrsc.h>
#include <print.h>
#include <lib/elf.h>
#include <errno.h>
#include <func.h>
#include <string.h>
#include <syscall/copy.h>
 
#ifndef LOADED_PROG_STACK_PAGES_NO
#define LOADED_PROG_STACK_PAGES_NO 1
#endif
 
/** Spinlock protecting the tasks_tree AVL tree. */
SPINLOCK_INITIALIZE(tasks_lock);
 
79,11 → 72,7
 
static task_id_t task_counter = 0;
 
/** Initialize tasks
*
* Initialize kernel tasks support.
*
*/
/** Initialize kernel tasks support. */
void task_init(void)
{
TASK = NULL;
91,7 → 80,8
}
 
/*
* The idea behind this walker is to remember a single task different from TASK.
* The idea behind this walker is to remember a single task different from
* TASK.
*/
static bool task_done_walker(avltree_node_t *node, void *arg)
{
106,9 → 96,7
return true; /* continue the walk */
}
 
/** Kill all tasks except the current task.
*
*/
/** Kill all tasks except the current task. */
void task_done(void)
{
task_t *t;
128,7 → 116,7
interrupts_restore(ipl);
#ifdef CONFIG_DEBUG
printf("Killing task %llu\n", id);
printf("Killing task %" PRIu64 "\n", id);
#endif
task_kill(id);
thread_usleep(10000);
140,15 → 128,13
} while (t != NULL);
}
 
/** Create new task
/** Create new task with no threads.
*
* Create new task with no threads.
* @param as Task's address space.
* @param name Symbolic name (a copy is made).
*
* @param as Task's address space.
* @param name Symbolic name.
* @return New task's structure.
*
* @return New task's structure
*
*/
task_t *task_create(as_t *as, char *name)
{
163,7 → 149,10
spinlock_initialize(&ta->lock, "task_ta_lock");
list_initialize(&ta->th_head);
ta->as = as;
ta->name = name;
 
memcpy(ta->name, name, TASK_NAME_BUFLEN);
ta->name[TASK_NAME_BUFLEN - 1] = '\0';
 
atomic_set(&ta->refcount, 0);
atomic_set(&ta->lifecount, 0);
ta->context = CONTEXT;
170,7 → 159,18
 
ta->capabilities = 0;
ta->cycles = 0;
 
#ifdef CONFIG_UDEBUG
/* Init debugging stuff */
udebug_task_init(&ta->udebug);
 
/* Init kbox stuff */
ipc_answerbox_init(&ta->kb.box, ta);
ta->kb.thread = NULL;
mutex_initialize(&ta->kb.cleanup_lock, MUTEX_PASSIVE);
ta->kb.finished = false;
#endif
 
ipc_answerbox_init(&ta->answerbox, ta);
for (i = 0; i < IPC_MAX_PHONES; i++)
ipc_phone_init(&ta->phones[i]);
179,7 → 179,7
ipc_phone_connect(&ta->phones[0], ipc_phone_0);
atomic_set(&ta->active_calls, 0);
 
mutex_initialize(&ta->futexes_lock);
mutex_initialize(&ta->futexes_lock, MUTEX_PASSIVE);
btree_create(&ta->futexes);
ipl = interrupts_disable();
202,7 → 202,7
 
/** Destroy task.
*
* @param t Task to be destroyed.
* @param t Task to be destroyed.
*/
void task_destroy(task_t *t)
{
233,90 → 233,63
TASK = NULL;
}
 
/** Create new task with 1 thread and run it
/** Syscall for reading task ID from userspace.
*
* @param program_addr Address of program executable image.
* @param name Program name.
* @param uspace_task_id userspace address of 8-byte buffer
* where to store current task ID.
*
* @return Task of the running program or NULL on error.
* @return Zero on success or an error code from @ref errno.h.
*/
task_t *task_run_program(void *program_addr, char *name)
unative_t sys_task_get_id(task_id_t *uspace_task_id)
{
as_t *as;
as_area_t *a;
unsigned int rc;
thread_t *t;
task_t *task;
uspace_arg_t *kernel_uarg;
 
as = as_create(0);
ASSERT(as);
 
rc = elf_load((elf_header_t *) program_addr, as);
if (rc != EE_OK) {
as_destroy(as);
return NULL;
}
kernel_uarg = (uspace_arg_t *) malloc(sizeof(uspace_arg_t), 0);
kernel_uarg->uspace_entry =
(void *) ((elf_header_t *) program_addr)->e_entry;
kernel_uarg->uspace_stack = (void *) USTACK_ADDRESS;
kernel_uarg->uspace_thread_function = NULL;
kernel_uarg->uspace_thread_arg = NULL;
kernel_uarg->uspace_uarg = NULL;
task = task_create(as, name);
ASSERT(task);
 
/*
* Create the data as_area.
* No need to acquire lock on TASK because taskid remains constant for
* the lifespan of the task.
*/
a = as_area_create(as, AS_AREA_READ | AS_AREA_WRITE | AS_AREA_CACHEABLE,
LOADED_PROG_STACK_PAGES_NO * PAGE_SIZE, USTACK_ADDRESS,
AS_AREA_ATTR_NONE, &anon_backend, NULL);
 
/*
* Create the main thread.
*/
t = thread_create(uinit, kernel_uarg, task, THREAD_FLAG_USPACE,
"uinit", false);
ASSERT(t);
thread_ready(t);
 
return task;
return (unative_t) copy_to_uspace(uspace_task_id, &TASK->taskid,
sizeof(TASK->taskid));
}
 
/** Syscall for reading task ID from userspace.
/** Syscall for setting the task name.
*
* @param uspace_task_id Userspace address of 8-byte buffer where to store
* current task ID.
* The name simplifies identifying the task in the task list.
*
* @param name The new name for the task. (typically the same
* as the command used to execute it).
*
* @return 0 on success or an error code from @ref errno.h.
*/
unative_t sys_task_get_id(task_id_t *uspace_task_id)
unative_t sys_task_set_name(const char *uspace_name, size_t name_len)
{
/*
* No need to acquire lock on TASK because taskid
* remains constant for the lifespan of the task.
*/
return (unative_t) copy_to_uspace(uspace_task_id, &TASK->taskid,
sizeof(TASK->taskid));
int rc;
char namebuf[TASK_NAME_BUFLEN];
 
/* Cap length of name and copy it from userspace. */
 
if (name_len > TASK_NAME_BUFLEN - 1)
name_len = TASK_NAME_BUFLEN - 1;
 
rc = copy_from_uspace(namebuf, uspace_name, name_len);
if (rc != 0)
return (unative_t) rc;
 
namebuf[name_len] = '\0';
strncpy(TASK->name, namebuf, TASK_NAME_BUFLEN);
 
return EOK;
}
 
/** Find task structure corresponding to task ID.
*
* The tasks_lock must be already held by the caller of this function
* and interrupts must be disabled.
* The tasks_lock must be already held by the caller of this function and
* interrupts must be disabled.
*
* @param id Task ID.
* @param id Task ID.
*
* @return Task structure address or NULL if there is no such task ID.
* @return Task structure address or NULL if there is no such task
* ID.
*/
task_t *task_find_by_id(task_id_t id)
{
avltree_node_t *node;
task_t *task_find_by_id(task_id_t id) { avltree_node_t *node;
node = avltree_search(&tasks_tree, (avltree_key_t) id);
 
327,11 → 300,13
 
/** Get accounting data of given task.
*
* Note that task lock of 't' must be already held and
* interrupts must be already disabled.
* Note that task lock of 't' must be already held and interrupts must be
* already disabled.
*
* @param t Pointer to thread.
* @param t Pointer to thread.
*
* @return Number of cycles used by the task and all its threads
* so far.
*/
uint64_t task_get_accounting(task_t *t)
{
363,9 → 338,9
* This function is idempotent.
* It signals all the task's threads to bail it out.
*
* @param id ID of the task to be killed.
* @param id ID of the task to be killed.
*
* @return 0 on success or an error code from errno.h
* @return Zero on success or an error code from errno.h.
*/
int task_kill(task_id_t id)
{
386,7 → 361,7
spinlock_unlock(&tasks_lock);
/*
* Interrupt all threads except ktaskclnp.
* Interrupt all threads.
*/
spinlock_lock(&ta->lock);
for (cur = ta->th_head.next; cur != &ta->th_head; cur = cur->next) {
394,7 → 369,7
bool sleeping = false;
thr = list_get_instance(cur, thread_t, th_link);
spinlock_lock(&thr->lock);
thr->interrupted = true;
if (thr->state == Sleeping)
420,18 → 395,22
uint64_t cycles;
char suffix;
order(task_get_accounting(t), &cycles, &suffix);
if (sizeof(void *) == 4)
printf("%-6llu %-10s %-3ld %#10zx %#10zx %9llu%c %7zd %6zd",
t->taskid, t->name, t->context, t, t->as, cycles, suffix,
t->refcount, atomic_get(&t->active_calls));
else
printf("%-6llu %-10s %-3ld %#18zx %#18zx %9llu%c %7zd %6zd",
t->taskid, t->name, t->context, t, t->as, cycles, suffix,
t->refcount, atomic_get(&t->active_calls));
 
#ifdef __32_BITS__
printf("%-6" PRIu64 " %-12s %-3" PRIu32 " %10p %10p %9" PRIu64
"%c %7ld %6ld", t->taskid, t->name, t->context, t, t->as, cycles,
suffix, atomic_get(&t->refcount), atomic_get(&t->active_calls));
#endif
 
#ifdef __64_BITS__
printf("%-6" PRIu64 " %-12s %-3" PRIu32 " %18p %18p %9" PRIu64
"%c %7ld %6ld", t->taskid, t->name, t->context, t, t->as, cycles,
suffix, atomic_get(&t->refcount), atomic_get(&t->active_calls));
#endif
 
for (j = 0; j < IPC_MAX_PHONES; j++) {
if (t->phones[j].callee)
printf(" %zd:%#zx", j, t->phones[j].callee);
printf(" %d:%p", j, t->phones[j].callee);
}
printf("\n");
447,19 → 426,21
/* Messing with task structures, avoid deadlock */
ipl = interrupts_disable();
spinlock_lock(&tasks_lock);
if (sizeof(void *) == 4) {
printf("taskid name ctx address as "
"cycles threads calls callee\n");
printf("------ ---------- --- ---------- ---------- "
"---------- ------- ------ ------>\n");
} else {
printf("taskid name ctx address as "
"cycles threads calls callee\n");
printf("------ ---------- --- ------------------ ------------------ "
"---------- ------- ------ ------>\n");
}
 
#ifdef __32_BITS__
printf("taskid name ctx address as "
"cycles threads calls callee\n");
printf("------ ------------ --- ---------- ---------- "
"---------- ------- ------ ------>\n");
#endif
 
#ifdef __64_BITS__
printf("taskid name ctx address as "
"cycles threads calls callee\n");
printf("------ ------------ --- ------------------ ------------------ "
"---------- ------- ------ ------>\n");
#endif
 
avltree_walk(&tasks_tree, task_print_walker, NULL);
 
spinlock_unlock(&tasks_lock);
/branches/dd/kernel/generic/src/proc/tasklet.c
51,7 → 51,7
tasklet_list = malloc(sizeof(tasklet_descriptor_t *) * config.cpu_count, 0);
if (!tasklet_list)
panic("Error initializing tasklets");
panic("Error initializing tasklets.");
for (i = 0; i < config.cpu_count; i++)
tasklet_list[i] = NULL;
/branches/dd/kernel/generic/src/proc/thread.c
67,9 → 67,13
#include <main/uinit.h>
#include <syscall/copy.h>
#include <errno.h>
#include <console/klog.h>
 
 
#ifndef LOADED_PROG_STACK_PAGES_NO
#define LOADED_PROG_STACK_PAGES_NO 1
#endif
 
 
/** Thread states */
char *thread_states[] = {
"Invalid",
98,7 → 102,7
thread_id_t last_tid = 0;
 
static slab_cache_t *thread_slab;
#ifdef ARCH_HAS_FPU
#ifdef CONFIG_FPU
slab_cache_t *fpu_context_slab;
#endif
 
157,7 → 161,7
/* call the architecture-specific part of the constructor */
thr_constructor_arch(t);
#ifdef ARCH_HAS_FPU
#ifdef CONFIG_FPU
#ifdef CONFIG_FPU_LAZY
t->saved_fpu_context = NULL;
#else
165,11 → 169,11
if (!t->saved_fpu_context)
return -1;
#endif
#endif
#endif
 
t->kstack = (uint8_t *) frame_alloc(STACK_FRAMES, FRAME_KA | kmflags);
if (!t->kstack) {
#ifdef ARCH_HAS_FPU
#ifdef CONFIG_FPU
if (t->saved_fpu_context)
slab_free(fpu_context_slab, t->saved_fpu_context);
#endif
176,6 → 180,10
return -1;
}
 
#ifdef CONFIG_UDEBUG
mutex_initialize(&t->udebug.lock, MUTEX_PASSIVE);
#endif
 
return 0;
}
 
188,7 → 196,7
thr_destructor_arch(t);
 
frame_free(KA2PA(t->kstack));
#ifdef ARCH_HAS_FPU
#ifdef CONFIG_FPU
if (t->saved_fpu_context)
slab_free(fpu_context_slab, t->saved_fpu_context);
#endif
203,11 → 211,11
void thread_init(void)
{
THREAD = NULL;
atomic_set(&nrdy,0);
atomic_set(&nrdy, 0);
thread_slab = slab_cache_create("thread_slab", sizeof(thread_t), 0,
thr_constructor, thr_destructor, 0);
 
#ifdef ARCH_HAS_FPU
#ifdef CONFIG_FPU
fpu_context_slab = slab_cache_create("fpu_slab", sizeof(fpu_context_t),
FPU_CONTEXT_ALIGN, NULL, NULL, 0);
#endif
271,7 → 279,7
* guarantee that the task won't cease to exist during the
* call. The task's lock may not be held.
* @param flags Thread flags.
* @param name Symbolic name.
* @param name Symbolic name (a copy is made).
* @param uncounted Thread's accounting doesn't affect accumulated task
* accounting.
*
289,8 → 297,7
return NULL;
/* Not needed, but good for debugging */
memsetb((uintptr_t) t->kstack, THREAD_STACK_SIZE * 1 << STACK_FRAMES,
0);
memsetb(t->kstack, THREAD_STACK_SIZE * 1 << STACK_FRAMES, 0);
ipl = interrupts_disable();
spinlock_lock(&tidlock);
309,6 → 316,7
interrupts_restore(ipl);
memcpy(t->name, name, THREAD_NAME_BUFLEN);
t->name[THREAD_NAME_BUFLEN - 1] = '\0';
t->thread_code = func;
t->thread_arg = arg;
344,6 → 352,11
avltree_node_initialize(&t->threads_tree_node);
t->threads_tree_node.key = (uintptr_t) t;
 
#ifdef CONFIG_UDEBUG
/* Init debugging stuff */
udebug_thread_initialize(&t->udebug);
#endif
 
/* might depend on previous initialization */
thread_create_arch(t);
 
406,12 → 419,17
ipl_t ipl;
 
/*
* Attach to the current task.
* Attach to the specified task.
*/
ipl = interrupts_disable();
spinlock_lock(&task->lock);
 
atomic_inc(&task->refcount);
atomic_inc(&task->lifecount);
 
/* Must not count kbox thread into lifecount */
if (t->flags & THREAD_FLAG_USPACE)
atomic_inc(&task->lifecount);
 
list_append(&t->th_link, &task->th_head);
spinlock_unlock(&task->lock);
 
434,18 → 452,22
{
ipl_t ipl;
 
if (atomic_predec(&TASK->lifecount) == 0) {
/*
* We are the last thread in the task that still has not exited.
* With the exception of the moment the task was created, new
* threads can only be created by threads of the same task.
* We are safe to perform cleanup.
*/
if (THREAD->flags & THREAD_FLAG_USPACE) {
if (THREAD->flags & THREAD_FLAG_USPACE) {
#ifdef CONFIG_UDEBUG
/* Generate udebug THREAD_E event */
udebug_thread_e_event();
#endif
if (atomic_predec(&TASK->lifecount) == 0) {
/*
* We are the last userspace thread in the task that
* still has not exited. With the exception of the
* moment the task was created, new userspace threads
* can only be created by threads of the same task.
* We are safe to perform cleanup.
*/
ipc_cleanup();
futex_cleanup();
klog_printf("Cleanup of task %llu completed.",
TASK->taskid);
futex_cleanup();
LOG("Cleanup of task %" PRIu64" completed.", TASK->taskid);
}
}
 
581,33 → 603,37
 
static bool thread_walker(avltree_node_t *node, void *arg)
{
thread_t *t;
t = avltree_get_instance(node, thread_t, threads_tree_node);
 
thread_t *t = avltree_get_instance(node, thread_t, threads_tree_node);
uint64_t cycles;
char suffix;
order(t->cycles, &cycles, &suffix);
if (sizeof(void *) == 4)
printf("%-6llu %-10s %#10zx %-8s %#10zx %-3ld %#10zx %#10zx %9llu%c ",
t->tid, t->name, t, thread_states[t->state], t->task,
t->task->context, t->thread_code, t->kstack, cycles, suffix);
else
printf("%-6llu %-10s %#18zx %-8s %#18zx %-3ld %#18zx %#18zx %9llu%c ",
t->tid, t->name, t, thread_states[t->state], t->task,
t->task->context, t->thread_code, t->kstack, cycles, suffix);
 
#ifdef __32_BITS__
printf("%-6" PRIu64" %-10s %10p %-8s %10p %-3" PRIu32 " %10p %10p %9" PRIu64 "%c ",
t->tid, t->name, t, thread_states[t->state], t->task,
t->task->context, t->thread_code, t->kstack, cycles, suffix);
#endif
 
#ifdef __64_BITS__
printf("%-6" PRIu64" %-10s %18p %-8s %18p %-3" PRIu32 " %18p %18p %9" PRIu64 "%c ",
t->tid, t->name, t, thread_states[t->state], t->task,
t->task->context, t->thread_code, t->kstack, cycles, suffix);
#endif
if (t->cpu)
printf("%-4zd", t->cpu->id);
printf("%-4u", t->cpu->id);
else
printf("none");
if (t->state == Sleeping) {
if (sizeof(uintptr_t) == 4)
printf(" %#10zx", t->sleep_queue);
else
printf(" %#18zx", t->sleep_queue);
#ifdef __32_BITS__
printf(" %10p", t->sleep_queue);
#endif
 
#ifdef __64_BITS__
printf(" %18p", t->sleep_queue);
#endif
}
printf("\n");
623,23 → 649,25
/* Messing with thread structures, avoid deadlock */
ipl = interrupts_disable();
spinlock_lock(&threads_lock);
if (sizeof(uintptr_t) == 4) {
printf("tid name address state task "
"ctx code stack cycles cpu "
"waitqueue\n");
printf("------ ---------- ---------- -------- ---------- "
"--- ---------- ---------- ---------- ---- "
"----------\n");
} else {
printf("tid name address state task "
"ctx code stack cycles cpu "
"waitqueue\n");
printf("------ ---------- ------------------ -------- ------------------ "
"--- ------------------ ------------------ ---------- ---- "
"------------------\n");
}
 
#ifdef __32_BITS__
printf("tid name address state task "
"ctx code stack cycles cpu "
"waitqueue\n");
printf("------ ---------- ---------- -------- ---------- "
"--- ---------- ---------- ---------- ---- "
"----------\n");
#endif
 
#ifdef __64_BITS__
printf("tid name address state task "
"ctx code stack cycles cpu "
"waitqueue\n");
printf("------ ---------- ------------------ -------- ------------------ "
"--- ------------------ ------------------ ---------- ---- "
"------------------\n");
#endif
 
avltree_walk(&threads_tree, thread_walker, NULL);
 
spinlock_unlock(&threads_lock);
664,7 → 692,6
return node != NULL;
}
 
 
/** Update accounting of current thread.
*
* Note that thread_lock on THREAD must be already held and
682,7 → 709,7
*
*/
unative_t sys_thread_create(uspace_arg_t *uspace_uarg, char *uspace_name,
thread_id_t *uspace_thread_id)
size_t name_len, thread_id_t *uspace_thread_id)
{
thread_t *t;
char namebuf[THREAD_NAME_BUFLEN];
689,10 → 716,15
uspace_arg_t *kernel_uarg;
int rc;
 
rc = copy_from_uspace(namebuf, uspace_name, THREAD_NAME_BUFLEN);
if (name_len > THREAD_NAME_BUFLEN - 1)
name_len = THREAD_NAME_BUFLEN - 1;
 
rc = copy_from_uspace(namebuf, uspace_name, name_len);
if (rc != 0)
return (unative_t) rc;
 
namebuf[name_len] = '\0';
 
/*
* In case of failure, kernel_uarg will be deallocated in this function.
* In case of success, kernel_uarg will be freed in uinit().
731,7 → 763,18
return (unative_t) rc;
}
}
#ifdef CONFIG_UDEBUG
/*
* Generate udebug THREAD_B event and attach the thread.
* This must be done atomically (with the debug locks held),
* otherwise we would either miss some thread or receive
* THREAD_B events for threads that already existed
* and could be detected with THREAD_READ before.
*/
udebug_thread_b_event_attach(t, TASK);
#else
thread_attach(t, TASK);
#endif
thread_ready(t);
 
return 0;
/branches/dd/kernel/generic/src/proc/program.c
0,0 → 1,233
/*
* Copyright (c) 2001-2004 Jakub Jermar
* Copyright (c) 2008 Jiri Svoboda
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* - The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
 
/** @addtogroup genericproc
* @{
*/
 
/**
* @file
* @brief Running userspace programs.
*/
 
#include <main/uinit.h>
#include <proc/thread.h>
#include <proc/task.h>
#include <proc/uarg.h>
#include <mm/as.h>
#include <mm/slab.h>
#include <arch.h>
#include <adt/list.h>
#include <ipc/ipc.h>
#include <ipc/ipcrsc.h>
#include <security/cap.h>
#include <lib/elf.h>
#include <errno.h>
#include <print.h>
#include <syscall/copy.h>
#include <proc/program.h>
 
#ifndef LOADED_PROG_STACK_PAGES_NO
#define LOADED_PROG_STACK_PAGES_NO 1
#endif
 
/**
* Points to the binary image used as the program loader. All non-initial
* tasks are created from this executable image.
*/
void *program_loader = NULL;
 
/** Create a program using an existing address space.
*
* @param as Address space containing a binary program image.
* @param entry_addr Program entry-point address in program address space.
* @param name Name to set for the program's task.
* @param p Buffer for storing program information.
*/
void program_create(as_t *as, uintptr_t entry_addr, char *name, program_t *p)
{
as_area_t *a;
uspace_arg_t *kernel_uarg;
 
kernel_uarg = (uspace_arg_t *) malloc(sizeof(uspace_arg_t), 0);
kernel_uarg->uspace_entry = (void *) entry_addr;
kernel_uarg->uspace_stack = (void *) USTACK_ADDRESS;
kernel_uarg->uspace_thread_function = NULL;
kernel_uarg->uspace_thread_arg = NULL;
kernel_uarg->uspace_uarg = NULL;
p->task = task_create(as, name);
ASSERT(p->task);
 
/*
* Create the data as_area.
*/
a = as_area_create(as, AS_AREA_READ | AS_AREA_WRITE | AS_AREA_CACHEABLE,
LOADED_PROG_STACK_PAGES_NO * PAGE_SIZE, USTACK_ADDRESS,
AS_AREA_ATTR_NONE, &anon_backend, NULL);
 
/*
* Create the main thread.
*/
p->main_thread = thread_create(uinit, kernel_uarg, p->task,
THREAD_FLAG_USPACE, "uinit", false);
ASSERT(p->main_thread);
}
 
/** Parse an executable image in the kernel memory.
*
* If the image belongs to a program loader, it is registered as such,
* (and *task is set to NULL). Otherwise a task is created from the
* executable image. The task is returned in *task.
*
* @param image_addr Address of an executable program image.
* @param name Name to set for the program's task.
* @param p Buffer for storing program info. If image_addr
* points to a loader image, p->task will be set to
* NULL and EOK will be returned.
*
* @return EOK on success or negative error code.
*/
int program_create_from_image(void *image_addr, char *name, program_t *p)
{
as_t *as;
unsigned int rc;
 
as = as_create(0);
ASSERT(as);
 
rc = elf_load((elf_header_t *) image_addr, as, 0);
if (rc != EE_OK) {
as_destroy(as);
p->task = NULL;
p->main_thread = NULL;
if (rc != EE_LOADER)
return ENOTSUP;
/* Register image as the program loader */
ASSERT(program_loader == NULL);
program_loader = image_addr;
printf("Registered program loader at 0x%" PRIp "\n",
image_addr);
return EOK;
}
 
program_create(as, ((elf_header_t *) image_addr)->e_entry, name, p);
 
return EOK;
}
 
/** Create a task from the program loader image.
*
* @param p Buffer for storing program info.
* @param name Name to set for the program's task.
*
* @return EOK on success or negative error code.
*/
int program_create_loader(program_t *p, char *name)
{
as_t *as;
unsigned int rc;
void *loader;
 
as = as_create(0);
ASSERT(as);
 
loader = program_loader;
if (!loader) {
printf("Cannot spawn loader as none was registered\n");
return ENOENT;
}
 
rc = elf_load((elf_header_t *) program_loader, as, ELD_F_LOADER);
if (rc != EE_OK) {
as_destroy(as);
return ENOENT;
}
 
program_create(as, ((elf_header_t *) program_loader)->e_entry,
name, p);
 
return EOK;
}
 
/** Make program ready.
*
* Switch program's main thread to the ready state.
*
* @param p Program to make ready.
*/
void program_ready(program_t *p)
{
thread_ready(p->main_thread);
}
 
/** Syscall for creating a new loader instance from userspace.
*
* Creates a new task from the program loader image and sets
* the task name.
*
* @param name Name to set on the new task (typically the same
* as the command used to execute it).
*
* @return 0 on success or an error code from @ref errno.h.
*/
unative_t sys_program_spawn_loader(char *uspace_name, size_t name_len)
{
program_t p;
int rc;
char namebuf[TASK_NAME_BUFLEN];
 
/* Cap length of name and copy it from userspace. */
 
if (name_len > TASK_NAME_BUFLEN - 1)
name_len = TASK_NAME_BUFLEN - 1;
 
rc = copy_from_uspace(namebuf, uspace_name, name_len);
if (rc != 0)
return (unative_t) rc;
 
namebuf[name_len] = '\0';
 
/* Spawn the new task. */
 
rc = program_create_loader(&p, namebuf);
if (rc != 0)
return rc;
 
// FIXME: control the capabilities
cap_set(p.task, cap_get(TASK));
 
program_ready(&p);
 
return EOK;
}
 
/** @}
*/