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Added preliminary support for execve(). Updates to clone, fork, exit, task handling.

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It turned out we used one version of kmalloc for malloc() and another for kfree()!
Now fixed.
Added parent-child relationship to tasks. Need to polish handling CLONE_PARENT and THREAD.
This commit is contained in:
Bahadir Balban
2008-11-19 12:59:52 +02:00
parent d182b5b35a
commit 46937eab88
39 changed files with 502 additions and 1192 deletions
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11
src/api/space.c
View File

@@ -7,6 +7,7 @@
#include INC_API(syscall.h)
#include INC_SUBARCH(mm.h)
#include <l4/api/errno.h>
#include <l4/api/space.h>
/* NOTE:
* For lazy mm switching, a list of newly created mappings that are common to
@@ -58,6 +59,16 @@ int sys_unmap(syscall_context_t *regs)
else if (!(target = find_task(tid)))
return -ESRCH;
/*
* These special values mean unmap all the mappings
* from task space except the kernel mappings
*/
if (virtual == UNMAP_ALL_SPACE &&
npages == UNMAP_ALL_SPACE) {
remove_mapping_pgd_all_user(target->pgd);
return 0;
}
for (int i = 0; i < npages; i++) {
ret = remove_mapping_pgd(virtual + i * PAGE_SIZE, target->pgd);
if (ret)

4
src/api/thread.c
View File

@@ -76,6 +76,10 @@ int thread_destroy(struct task_ids *ids)
*/
BUG_ON(task->wqh_pager.sleepers > 0);
/*
* FIXME: We need to free the pgd and any thread specific pmds!!!
*/
/* We can now safely delete the task */
free_page(task);

68
src/arch/arm/v5/mm.c
View File

@@ -300,6 +300,57 @@ int __remove_mapping(pmd_table_t *pmd, unsigned long vaddr)
return ret;
}
/*
* Tell if a pgd index is a common kernel index. This is used to distinguish
* common kernel entries in a pgd, when copying page tables.
*/
int is_kern_pgdi(int i)
{
if ((i >= PGD_INDEX(KERNEL_AREA_START) && i < PGD_INDEX(KERNEL_AREA_END)) ||
(i >= PGD_INDEX(IO_AREA_START) && i < PGD_INDEX(IO_AREA_END)) ||
(i == PGD_INDEX(USER_KIP_PAGE)) ||
(i == PGD_INDEX(ARM_HIGH_VECTOR)) ||
(i == PGD_INDEX(ARM_SYSCALL_VECTOR)) ||
(i == PGD_INDEX(USERSPACE_UART_BASE)))
return 1;
else
return 0;
}
/*
* Removes all userspace mappings from a pgd. Frees any pmds that it
* detects to be user pmds
*/
int remove_mapping_pgd_all_user(pgd_table_t *pgd)
{
pmd_table_t *pmd;
/* Traverse through all pgd entries */
for (int i = 0; i < PGD_ENTRY_TOTAL; i++) {
/* Detect a pgd entry that is not a kernel entry */
if (!is_kern_pgdi(i)) {
/* Detect a pmd entry */
if (((pgd->entry[i] & PGD_TYPE_MASK)
== PGD_TYPE_COARSE)) {
/* Obtain the user pmd handle */
pmd = (pmd_table_t *)
phys_to_virt((pgd->entry[i] &
PGD_COARSE_ALIGN_MASK));
/* Free it */
free_pmd(pmd);
}
/* Clear the pgd entry */
pgd->entry[i] = PGD_TYPE_FAULT;
}
}
return 0;
}
int remove_mapping_pgd(unsigned long vaddr, pgd_table_t *pgd)
{
pgd_t pgd_i = PGD_INDEX(vaddr);
@@ -367,23 +418,6 @@ int remove_mapping(unsigned long vaddr)
return remove_mapping_pgd(vaddr, current->pgd);
}
/*
* Tell if a pgd index is a common kernel index. This is used to distinguish
* common kernel entries in a pgd, when copying page tables.
*/
int is_kern_pgdi(int i)
{
if ((i >= PGD_INDEX(KERNEL_AREA_START) && i < PGD_INDEX(KERNEL_AREA_END)) ||
(i >= PGD_INDEX(IO_AREA_START) && i < PGD_INDEX(IO_AREA_END)) ||
(i == PGD_INDEX(USER_KIP_PAGE)) ||
(i == PGD_INDEX(ARM_HIGH_VECTOR)) ||
(i == PGD_INDEX(ARM_SYSCALL_VECTOR)) ||
(i == PGD_INDEX(USERSPACE_UART_BASE)))
return 1;
else
return 0;
}
/*
* Allocates and copies all levels of page tables from one task to another.
* Useful when forking.