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Changes to make sure after a fork a child process can safely return.

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This copies the parent kernel stack to child only for the part where
the previous context is saved. Then the child registers are modified
so that it would begin execution from returning of the system call.
This commit is contained in:
Bahadir Balban
2008-08-21 16:21:08 +03:00
parent dada3e0b2c
commit 3ce220f062
7 changed files with 84 additions and 21 deletions
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8
src/api/syscall.c
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@@ -17,7 +17,7 @@
#include INC_API(syscall.h)
#include INC_ARCH(exception.h)
int sys_exchange_registers(struct syscall_args *regs)
int sys_exchange_registers(syscall_context_t *regs)
{
struct ktcb *task;
unsigned int pc = regs->r0;
@@ -43,7 +43,7 @@ found:
return 0;
}
int sys_schedule(struct syscall_args *regs)
int sys_schedule(syscall_context_t *regs)
{
printk("(SVC) %s called. Tid (%d)\n", __FUNCTION__, current->tid);
return 0;
@@ -54,7 +54,7 @@ int sys_space_control(struct syscall_args *regs)
return -ENOSYS;
}
int sys_getid(struct syscall_args *regs)
int sys_getid(syscall_context_t *regs)
{
struct task_ids *ids = (struct task_ids *)regs->r0;
struct ktcb *this = current;
@@ -83,7 +83,7 @@ int validate_granted_pages(unsigned long pfn, int npages)
* this memory is used for thread creation and memory mapping, (e.g. new
* page tables, page middle directories, per-task kernel stack etc.)
*/
int sys_kmem_control(struct syscall_args *regs)
int sys_kmem_control(syscall_context_t *regs)
{
unsigned long pfn = (unsigned long)regs->r0;
int npages = (int)regs->r1;