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Towards adding sys_clone()

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Stopped working on self_spawn() - going to finish clone() syscall first.
Arch-specific clone() library call that does ipc() and cloned child setup.
- Need to finish thread_create() that satisfy clone() necessities. i.e. setting up its stack.
  Question: Does the pager (and thus the microkernel) have to explicitly set SP_USR?
  Once the call is known to be successful, the library could set it.
This commit is contained in:
Bahadir Balban
2008-09-11 16:56:41 +03:00
parent fc51512438
commit af03975dc1
6 changed files with 230 additions and 35 deletions
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36
tasks/libposix/fork.c
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@@ -47,3 +47,39 @@ int fork(void)
return ret;
}
extern int arch_clone(int, int);
int clone(int (*fn)(void *), void *child_stack, int flags, void *arg, ...)
{
/* Set up the child stack */
unsigned int *stack = child_stack;
int ret;
/* First word of new stack is arg */
stack[-1] = (unsigned long)arg;
/* Second word of new stack is function address */
stack[-2] = (unsigned long)fn;
/* Write the tag */
l4_set_tag(L4_IPC_TAG_CLONE);
/* Write the args as in usual ipc */
write_mr(L4SYS_ARG0, flags);
write_mr(L4SYS_ARG1, (unsigned long)child_stack);
/* Perform an ipc but with different return logic. See implementation. */
if ((ret = arch_clone(PAGER_TID, PAGER_TID)) < 0) {
printf("%s: L4 IPC Error: %d.\n", __FUNCTION__, ret);
return ret;
}
if ((ret = l4_get_retval()) < 0) {
printf("%s: CLONE Error: %d.\n", __FUNCTION__, ret);
return ret;
}
return ret;
}