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task_fork.c: Fix vfork for BUILD_KERNEL

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Two things need to be done when vfork'ing:
- Must attach to parent's address environment (the addrenv is shared)
- Must allocate a kernel stack (where would the register context go otherwise)

Note that this code assumes the address environment is shared, since we
don't support fork() which would _clone_ the address environment instead.
This commit is contained in:
Ville Juven 2024-08-01 12:41:41 +03:00 committed by Alan Carvalho de Assis
parent 3c05da536a
commit 6047a9fe14
1 changed files with 26 additions and 0 deletions
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26
sched/task/task_fork.c
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@ -145,6 +145,19 @@ FAR struct task_tcb_s *nxtask_setup_fork(start_t retaddr)
child->cmn.flags |= TCB_FLAG_FREE_TCB;
#if defined(CONFIG_ARCH_ADDRENV)
/* Join the parent address environment (REVISIT: vfork() only) */
if (ttype != TCB_FLAG_TTYPE_KERNEL)
{
ret = addrenv_join(parent, &child->cmn);
if (ret < 0)
{
goto errout_with_tcb;
}
}
#endif
/* Initialize the task join */
nxtask_joininit(&child->cmn);
@ -184,6 +197,19 @@ FAR struct task_tcb_s *nxtask_setup_fork(start_t retaddr)
goto errout_with_tcb;
}
#if defined(CONFIG_ARCH_ADDRENV) && defined(CONFIG_ARCH_KERNEL_STACK)
/* Allocate the kernel stack */
if (ttype != TCB_FLAG_TTYPE_KERNEL)
{
ret = up_addrenv_kstackalloc(&child->cmn);
if (ret < 0)
{
goto errout_with_tcb;
}
}
#endif
/* Setup thread local storage */
ret = tls_dup_info(&child->cmn, parent);