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/** @addtogroup generic |
* @{ |
*/ |
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/** |
* @file |
* @brief Tdebug. |
*/ |
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#include <console/klog.h> |
#include <proc/task.h> |
#include <proc/thread.h> |
#include <arch.h> |
#include <errno.h> |
#include <syscall/copy.h> |
#include <ipc/ipc.h> |
#include <udebug/udebug.h> |
#include <udebug/udebug_ops.h> |
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/** |
* Prepare a thread for a debugging operation. |
* |
* Simply put, return thread t with t->debug_lock held, |
* but only if it verifies all conditions. |
* |
* Specifically, verifies that thread t exists, is a userspace thread, |
* and belongs to the current task (TASK). It also locks t->debug_lock, |
* making sure that t->debug_active is true - that the thread is |
* in a valid debugging session. |
* |
* Returns EOK if all went well, or an error code otherwise. |
* Interrupts must be already disabled when calling this function. |
* |
* Note: This function sports complicated locking. |
*/ |
static int _thread_op_begin(thread_t *t) |
{ |
int rc; |
task_id_t taskid; |
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taskid = TASK->taskid; |
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/* Must lock threads_lock to ensure continued existence of the thread */ |
spinlock_lock(&threads_lock); |
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if (!thread_exists(t)) { |
spinlock_unlock(&threads_lock); |
return ENOENT; |
} |
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spinlock_lock(&t->debug_lock); |
spinlock_lock(&t->lock); |
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/* Now verify that it's the current task */ |
if (t->task != TASK) { |
/* No such thread belonging to callee */ |
rc = ENOENT; |
goto error_exit; |
} |
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/* Verify that 't' is a userspace thread */ |
if ((t->flags & THREAD_FLAG_USPACE) == 0) { |
/* It's not, deny its existence */ |
rc = ENOENT; |
goto error_exit; |
} |
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if ((t->debug_active != true) || (t->debug_stop != true)) { |
/* Not in debugging session or already has GO */ |
rc = ENOENT; |
goto error_exit; |
} |
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spinlock_unlock(&threads_lock); |
spinlock_unlock(&t->lock); |
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/* Only t->debug_lock left */ |
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return EOK; /* All went well */ |
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/* Executed when a check on the thread fails */ |
error_exit: |
spinlock_unlock(&t->lock); |
spinlock_unlock(&t->debug_lock); |
spinlock_unlock(&threads_lock); |
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/* No locks left here */ |
return rc; /* Some errors occured */ |
} |
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static void _thread_op_end(thread_t *t) |
{ |
spinlock_unlock(&t->debug_lock); |
} |
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/** |
* \return 0 (ok, but not done yet), 1 (done) or negative error code. |
*/ |
int udebug_begin(call_t *call) |
{ |
ipl_t ipl; |
int reply; |
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thread_t *t; |
link_t *cur; |
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klog_printf("udebug_begin()"); |
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ipl = interrupts_disable(); |
klog_printf("debugging task %llu", TASK->taskid); |
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spinlock_lock(&TASK->lock); |
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if (TASK->dt_state != UDEBUG_TS_INACTIVE) { |
spinlock_unlock(&TASK->lock); |
interrupts_restore(ipl); |
klog_printf("udebug_begin(): busy error"); |
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return EBUSY; |
} |
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TASK->dt_state = UDEBUG_TS_BEGINNING; |
TASK->debug_begin_call = call; |
TASK->debugger = call->sender; |
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if (TASK->not_stoppable_count == 0) { |
TASK->dt_state = UDEBUG_TS_ACTIVE; |
TASK->debug_begin_call = NULL; |
reply = 1; /* immediate reply */ |
} else { |
reply = 0; /* no reply */ |
} |
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/* Set debug_active on all of the task's userspace threads */ |
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for (cur = TASK->th_head.next; cur != &TASK->th_head; cur = cur->next) { |
t = list_get_instance(cur, thread_t, th_link); |
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spinlock_lock(&t->debug_lock); |
if ((t->flags & THREAD_FLAG_USPACE) != 0) |
t->debug_active = true; |
spinlock_unlock(&t->debug_lock); |
} |
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spinlock_unlock(&TASK->lock); |
interrupts_restore(ipl); |
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klog_printf("udebug_begin() done (%s)", |
reply ? "reply" : "stoppability wait"); |
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return reply; |
} |
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int udebug_end(void) |
{ |
ipl_t ipl; |
int rc; |
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klog_printf("udebug_end()"); |
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ipl = interrupts_disable(); |
spinlock_lock(&TASK->lock); |
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rc = udebug_task_cleanup(TASK); |
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klog_printf("task %llu", TASK->taskid); |
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spinlock_unlock(&TASK->lock); |
interrupts_restore(ipl); |
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if (rc < 0) return EINVAL; |
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return 0; |
} |
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int udebug_go(thread_t *t, call_t *call) |
{ |
ipl_t ipl; |
int rc; |
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klog_printf("udebug_go()"); |
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ipl = interrupts_disable(); |
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/* On success, this will lock t->debug_lock */ |
rc = _thread_op_begin(t); |
if (rc != EOK) { |
interrupts_restore(ipl); |
return rc; |
} |
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t->debug_go_call = call; |
t->debug_stop = false; |
t->cur_event = 0; /* none */ |
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/* |
* Neither t's lock nor threads_lock may be held during wakeup |
*/ |
waitq_wakeup(&t->go_wq, WAKEUP_FIRST); |
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_thread_op_end(t); |
interrupts_restore(ipl); |
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return 0; |
} |
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int udebug_thread_read(void **buffer, size_t *n) |
{ |
thread_t *t; |
link_t *cur; |
unative_t tid; |
unsigned num_threads, copied_ids; |
ipl_t ipl; |
unative_t *id_buffer; |
int flags; |
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klog_printf("udebug_thread_read()"); |
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ipl = interrupts_disable(); |
spinlock_lock(&TASK->lock); |
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/* Verify task state */ |
if (TASK->dt_state != UDEBUG_TS_ACTIVE) { |
spinlock_unlock(&TASK->lock); |
interrupts_restore(ipl); |
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return EINVAL; |
} |
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/* Count the threads first */ |
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num_threads = 0; |
for (cur = TASK->th_head.next; cur != &TASK->th_head; cur = cur->next) { |
/* Count all threads, to be on the safe side */ |
++num_threads; |
} |
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/* Allocate a buffer and copy down the threads' ids */ |
id_buffer = malloc(num_threads * sizeof(unative_t), 0); // ??? |
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copied_ids = 0; |
for (cur = TASK->th_head.next; cur != &TASK->th_head; cur = cur->next) { |
t = list_get_instance(cur, thread_t, th_link); |
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spinlock_lock(&t->lock); |
flags = t->flags; |
spinlock_unlock(&t->lock); |
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/* Not interested in kernel threads */ |
if ((flags & THREAD_FLAG_USPACE) != 0) { |
/* Using thread struct pointer for identification */ |
tid = (unative_t) t; |
id_buffer[copied_ids++] = tid; |
} |
} |
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spinlock_unlock(&TASK->lock); |
interrupts_restore(ipl); |
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*buffer = id_buffer; |
*n = copied_ids * sizeof(unative_t); |
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return 0; |
} |
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int udebug_args_read(thread_t *t, void **buffer) |
{ |
int rc; |
ipl_t ipl; |
unative_t *arg_buffer; |
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klog_printf("udebug_args_read()"); |
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ipl = interrupts_disable(); |
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/* On success, this will lock t->debug_lock */ |
rc = _thread_op_begin(t); |
if (rc != EOK) { |
interrupts_restore(ipl); |
return rc; |
} |
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/* Additionally we need to verify that we are inside a syscall */ |
if (t->cur_event != UDEBUG_EVENT_SYSCALL) { |
_thread_op_end(t); |
interrupts_restore(ipl); |
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return EINVAL; |
} |
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/* Copy to a local buffer before releasing the lock */ |
arg_buffer = malloc(6 * sizeof(unative_t), 0); // ??? |
memcpy(arg_buffer, t->syscall_args, 6 * sizeof(unative_t)); |
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_thread_op_end(t); |
interrupts_restore(ipl); |
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*buffer = arg_buffer; |
return 0; |
} |
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int udebug_regs_read(thread_t *t, void **buffer, size_t *n) |
{ |
istate_t *state; |
void *regs_buffer; |
int rc; |
ipl_t ipl; |
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klog_printf("udebug_regs_read()"); |
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ipl = interrupts_disable(); |
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/* On success, this will lock t->debug_lock */ |
rc = _thread_op_begin(t); |
if (rc != EOK) { |
interrupts_restore(ipl); |
return rc; |
} |
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state = t->uspace_state; |
if (state == NULL) { |
_thread_op_end(t); |
interrupts_restore(ipl); |
klog_printf("udebug_regs_read() - istate not available"); |
return EBUSY; |
} |
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/* Copy to an allocated buffer */ |
regs_buffer = malloc(sizeof(istate_t), 0); // ??? |
memcpy(regs_buffer, state, sizeof(istate_t)); |
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_thread_op_end(t); |
interrupts_restore(ipl); |
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*buffer = regs_buffer; |
*n = sizeof(istate_t); |
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return 0; |
} |
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int udebug_regs_write(thread_t *t, void *buffer) |
{ |
int rc; |
istate_t *state; |
ipl_t ipl; |
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klog_printf("udebug_regs_write()"); |
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/* Try to change the thread's uspace_state */ |
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ipl = interrupts_disable(); |
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/* On success, this will lock t->debug_lock */ |
rc = _thread_op_begin(t); |
if (rc != EOK) { |
interrupts_restore(ipl); |
return rc; |
} |
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state = t->uspace_state; |
if (state == NULL) { |
_thread_op_end(t); |
interrupts_restore(ipl); |
klog_printf("udebug_regs_write() - istate not available"); |
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return EBUSY; |
} |
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memcpy(t->uspace_state, buffer, sizeof(t->uspace_state)); |
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_thread_op_end(t); |
interrupts_restore(ipl); |
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return 0; |
} |
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int udebug_mem_read(unative_t uspace_addr, size_t n, void **buffer) |
{ |
void *data_buffer; |
int rc; |
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klog_printf("udebug_mem_read()"); |
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data_buffer = malloc(n, 0); // ??? |
klog_printf("udebug_mem_read: src=%u, size=%u", uspace_addr, n); |
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/* NOTE: this is not strictly from a syscall... but that shouldn't |
* be a problem */ |
rc = copy_from_uspace(data_buffer, (void *)uspace_addr, n); |
if (rc) return rc; |
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*buffer = data_buffer; |
return 0; |
} |
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int udebug_mem_write(unative_t uspace_addr, void *data, size_t n) |
{ |
int rc; |
udebug_task_state_t dts; |
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klog_printf("udebug_mem_write()"); |
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/* Verify task state */ |
spinlock_lock(&TASK->lock); |
dts = TASK->dt_state; |
spinlock_unlock(&TASK->lock); |
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if (dts != UDEBUG_TS_ACTIVE) |
return EBUSY; |
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klog_printf("dst=%u, size=%u", uspace_addr, n); |
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/* NOTE: this is not strictly from a syscall... but that shouldn't |
* be a problem */ |
rc = copy_to_uspace((void *)uspace_addr, data, n); |
if (rc) return rc; |
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return 0; |
} |
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/** @} |
*/ |