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Modified task initialisation so that stack now comes beneath the environment

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Environment is backed by a special per-task file maintained by mm0 for each task.
This file is filled in by the env pager, by simple copying of env data into the
faulty page upon a fault. UTCB and all anon regions (stack) could use the same
scheme.

Fixed IS_ERR(x) to accept negative values that are above -1000 for errors. This
protects against false positives for pointers such as 0xE0000000.

	modified:   include/l4/generic/scheduler.h
	modified:   include/l4/macros.h
	modified:   src/arch/arm/exception.c
	modified:   tasks/fs0/include/linker.lds
	modified:   tasks/libl4/src/init.c
	modified:   tasks/libposix/shm.c
	new file:   tasks/mm0/include/env.h
	modified:   tasks/mm0/include/file.h
	new file:   tasks/mm0/include/lib/addr.h
	deleted:    tasks/mm0/include/lib/vaddr.h
	modified:   tasks/mm0/include/task.h
	new file:   tasks/mm0/include/utcb.h
	new file:   tasks/mm0/src/env.c
	modified:   tasks/mm0/src/fault.c
	modified:   tasks/mm0/src/file.c
	modified:   tasks/mm0/src/init.c
	new file:   tasks/mm0/src/lib/addr.c
	modified:   tasks/mm0/src/lib/idpool.c
	deleted:    tasks/mm0/src/lib/vaddr.c
	modified:   tasks/mm0/src/mmap.c
	modified:   tasks/mm0/src/shm.c
	modified:   tasks/mm0/src/task.c
	new file:   tasks/mm0/src/utcb.c
	modified:   tasks/test0/include/linker.lds
This commit is contained in:
Bahadir Balban
2008-02-29 01:43:56 +00:00
parent 5b7bb88008
commit 617d24b4f0
24 changed files with 316 additions and 144 deletions
Download Patch File Download Diff File Expand all files Collapse all files

22
tasks/mm0/include/task.h
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@@ -12,6 +12,7 @@
#include <l4/lib/list.h>
#include <l4lib/types.h>
#include <l4lib/utcb.h>
#include <lib/addr.h>
#define __TASKNAME__ __PAGERNAME__
@@ -43,7 +44,7 @@ struct tcb {
/* Related task ids */
unsigned int pagerid; /* Task's pager */
/* Program segment marks */
/* Program segment marks, ends exclusive as usual */
unsigned long text_start;
unsigned long text_end;
unsigned long data_start;
@@ -51,9 +52,9 @@ struct tcb {
unsigned long bss_start;
unsigned long bss_end;
unsigned long stack_start;
unsigned long stack_end; /* Exclusive of last currently mapped page */
unsigned long stack_end;
unsigned long heap_start;
unsigned long heap_end; /* Exclusive of last currently mapped page */
unsigned long heap_end;
unsigned long env_start;
unsigned long env_end;
unsigned long args_start;
@@ -62,17 +63,24 @@ struct tcb {
/* UTCB address */
unsigned long utcb_address;
/* Temporary storage for environment data */
void *env_data;
unsigned long env_size;
/* Per-task environment file */
struct vm_file *env_file;
/* Virtual memory areas */
struct list_head vm_area_list;
/* Per-task swap file for now */
struct vm_file *swap_file;
/* File descriptors for this task */
struct file_descriptor fd[TASK_OFILES_MAX];
/* Per-task swap file for now */
struct vm_file *swap_file;
/* Pool to generate swap file offsets for fileless anonymous regions */
struct id_pool *swap_file_offset_pool;
struct address_pool swap_file_offset_pool;
};
struct tcb *find_task(int tid);