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Modified task initialisation so that stack now comes beneath the environment

Browse Source 
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

2
include/l4/generic/scheduler.h
View File

@@ -12,7 +12,7 @@
/* Ticks per second, try ticks = 1000 + timeslice = 1 for regressed preemption test. */
#define HZ 10
#define TASK_TIMESLICE_DEFAULT 100
#define TASK_TIMESLICE_DEFAULT 500
/* #define TASK_TIMESLICE_DEFAULT (HZ/100)*/
static inline struct ktcb *current_task(void)

3
include/l4/macros.h
View File

@@ -77,7 +77,8 @@
/* Functions who may either return a pointer or an error code can use these: */
#define PTR_ERR(x) ((void *)(x))
#define IS_ERR(x) (((int)(x)) < 0)
/* checks up to -1000, the rest might be valid pointers!!! E.g. 0xE0000000 */
#define IS_ERR(x) ((((int)(x)) < 0) && (((int)(x) > -1000)))
/* TEST: Is this type of printk well tested? */
#define BUG() {do { \