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Added error handling to task_mmap_segments()

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This commit is contained in:
Bahadir Balban
2009-05-14 13:00:27 +03:00
parent da3b293ab4
commit 3b8386fe7d
1 changed files with 34 additions and 24 deletions
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58
tasks/mm0/src/task.c
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@@ -444,10 +444,13 @@ int task_map_stack(struct vm_file *f, struct exec_file_desc *efd, struct tcb *ta
}
/* Map the stack's part that will contain args and environment */
args_on_stack =
pager_validate_map_user_range2(task,
(void *)task->args_start,
stack_used, VM_READ | VM_WRITE);
if (IS_ERR(args_on_stack =
pager_validate_map_user_range2(task,
(void *)task->args_start,
stack_used,
VM_READ | VM_WRITE))) {
return (int)args_on_stack;
}
/* Copy arguments and env */
task_args_to_user(args_on_stack, args, env);
@@ -532,6 +535,7 @@ int task_mmap_segments(struct tcb *task, struct vm_file *file, struct exec_file_
void *mapped;
//struct vm_file *shm;
int err;
int text_size, data_size;
/* Set up task's user boundary regions */
task->start = USER_AREA_START;
@@ -539,49 +543,55 @@ int task_mmap_segments(struct tcb *task, struct vm_file *file, struct exec_file_
task->map_start = task->start;
task->map_end = task->end;
text_size = __pfn(page_align_up(task->text_end) -
page_align(task->text_start));
data_size = __pfn(page_align_up(task->data_end) -
page_align(task->text_start));
/* mmap task's text to task's address space. */
if (IS_ERR(mapped = do_mmap(file, efd->text_offset, task, task->text_start,
VM_READ | VM_WRITE | VM_EXEC | VMA_PRIVATE,
__pfn(page_align_up(task->text_end) -
page_align(task->text_start))))) {
if (IS_ERR(mapped = do_mmap(file, efd->text_offset, task,
task->text_start, VM_READ | VM_WRITE |
VM_EXEC | VMA_PRIVATE, text_size))) {
printf("do_mmap: failed with %d.\n", (int)mapped);
return (int)mapped;
err = (int)mapped;
goto out_err;
}
/* mmap task's data to task's address space. */
if (IS_ERR(mapped = do_mmap(file, efd->data_offset, task, task->data_start,
VM_READ | VM_WRITE | VMA_PRIVATE,
__pfn(page_align_up(task->data_end) -
page_align(task->data_start))))) {
if (IS_ERR(mapped = do_mmap(file, efd->data_offset, task,
task->data_start, VM_READ | VM_WRITE |
VMA_PRIVATE, data_size))) {
printf("do_mmap: failed with %d.\n", (int)mapped);
return (int)mapped;
err = (int)mapped;
goto out_err;
}
/* mmap task's bss as anonymous memory. */
if ((err = task_map_bss(file, efd, task)) < 0) {
printf("%s: Mapping bss has failed.\n",
__FUNCTION__);
return err;
goto out_err;
}
/* mmap task's stack, writing in the arguments and environment */
if ((err = task_map_stack(file, efd, task, args, env)) < 0) {
printf("%s: Mapping task's stack has failed.\n",
__FUNCTION__);
return err;
goto out_err;
}
/* Get a new utcb slot for new task */
task_setup_utcb(task);
/*
* Recycled task's shared page shm still exists. Current task will
* attach to it when it starts in userspace.
*/
//if (IS_ERR(shm = shm_new((key_t)task->utcb, __pfn(DEFAULT_UTCB_SIZE))))
// return (int)shm;
if ((err = task_setup_utcb(task)) < 0) {
printf("%s: Mapping task's utcb has failed.\n",
__FUNCTION__);
goto out_err;
}
return 0;
out_err:
task_free_resources(task);
return err;
}
int task_setup_registers(struct tcb *task, unsigned int pc,