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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

10
src/arch/arm/exception.c
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@@ -82,22 +82,22 @@ int check_aborts(u32 faulted_pc, u32 fsr, u32 far)
int ret = 0;
if (is_prefetch_abort(fsr)) {
// dprintk("Prefetch abort @ ", faulted_pc);
dprintk("Prefetch abort @ ", faulted_pc);
return 0;
}
switch (fsr & ARM_FSR_MASK) {
/* Aborts that are expected on page faults: */
case DABT_PERM_PAGE:
// dprintk("Page permission fault @ ", far);
dprintk("Page permission fault @ ", far);
ret = 0;
break;
case DABT_XLATE_PAGE:
// dprintk("Page translation fault @ ", far);
dprintk("Page translation fault @ ", far);
ret = 0;
break;
case DABT_XLATE_SECT:
// dprintk("Section translation fault @ ", far);
dprintk("Section translation fault @ ", far);
ret = 0;
break;
@@ -166,7 +166,7 @@ int check_aborts(u32 faulted_pc, u32 fsr, u32 far)
void data_abort_handler(u32 faulted_pc, u32 fsr, u32 far)
{
set_abort_type(fsr, ARM_DABT);
// dprintk("Data abort @ PC: ", faulted_pc);
dprintk("Data abort @ PC: ", faulted_pc);
if (check_aborts(faulted_pc, fsr, far) < 0) {
printascii("This abort can't be handled by any pager.\n");
goto error;