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incubator-nuttx/binfmt/binfmt_execmodule.c

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/****************************************************************************
* binfmt/binfmt_execmodule.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <stdint.h>
#include <stdlib.h>
#include <sched.h>
#include <debug.h>
#include <errno.h>
#include <nuttx/addrenv.h>
#include <nuttx/arch.h>
#include <nuttx/fs/fs.h>
#include <nuttx/kmalloc.h>
#include <nuttx/sched.h>
#include <sched/sched.h>
#include <task/spawn.h>
#include <nuttx/spawn.h>
#include <nuttx/binfmt/binfmt.h>
#include "binfmt.h"
#ifndef CONFIG_BINFMT_DISABLE
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* If C++ constructors are used, then CONFIG_SCHED_STARTHOOK must also be
* selected be the start hook is used to schedule execution of the
* constructors.
*/
#if defined(CONFIG_BINFMT_CONSTRUCTORS) && !defined(CONFIG_SCHED_STARTHOOK)
# error "CONFIG_SCHED_STARTHOOK must be defined to use constructors"
#endif
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: exec_ctors
*
* Description:
* Execute C++ static constructors. This function is registered as a
* start hook and runs on the thread of the newly created task before
* the new task's main function is called.
*
* Input Parameters:
* arg - Argument is instance of load state info structure cast to void *.
*
* Returned Value:
* 0 (OK) is returned on success and a negated errno is returned on
* failure.
*
****************************************************************************/
#ifdef CONFIG_BINFMT_CONSTRUCTORS
static void exec_ctors(FAR void *arg)
{
FAR const struct binary_s *binp = (FAR const struct binary_s *)arg;
binfmt_ctor_t *ctor = binp->ctors;
int i;
/* Execute each constructor */
for (i = 0; i < binp->nctors; i++)
{
binfo("Calling ctor %d at %p\n", i, ctor);
(*ctor)();
ctor++;
}
}
#endif
/****************************************************************************
* Name: exec_swap
*
* Description:
* swap the pid of tasks, and reverse parent-child relationship.
*
* Input Parameters:
* ptcb - parent task tcb.
* chtcb - child task tcb.
*
* Returned Value:
* none
*
****************************************************************************/
static void exec_swap(FAR struct tcb_s *ptcb, FAR struct tcb_s *chtcb)
{
int pndx;
int chndx;
pid_t pid;
irqstate_t flags;
#ifdef HAVE_GROUP_MEMBERS
FAR pid_t *tg_members;
#endif
#ifdef CONFIG_SCHED_HAVE_PARENT
# ifdef CONFIG_SCHED_CHILD_STATUS
FAR struct child_status_s *tg_children;
# else
uint16_t tg_nchildren;
# endif
#endif
DEBUGASSERT(ptcb);
DEBUGASSERT(chtcb);
flags = enter_critical_section();
pndx = PIDHASH(ptcb->pid);
chndx = PIDHASH(chtcb->pid);
DEBUGASSERT(g_pidhash[pndx]);
DEBUGASSERT(g_pidhash[chndx]);
/* Exchange g_pidhash index */
g_pidhash[pndx] = chtcb;
g_pidhash[chndx] = ptcb;
/* Exchange pid */
pid = chtcb->pid;
chtcb->pid = ptcb->pid;
ptcb->pid = pid;
/* Exchange group info. This will reverse parent-child relationship */
pid = chtcb->group->tg_pid;
chtcb->group->tg_pid = ptcb->group->tg_pid;
ptcb->group->tg_pid = pid;
pid = chtcb->group->tg_ppid;
chtcb->group->tg_ppid = ptcb->group->tg_ppid;
ptcb->group->tg_ppid = pid;
#ifdef HAVE_GROUP_MEMBERS
tg_members = chtcb->group->tg_members;
chtcb->group->tg_members = ptcb->group->tg_members;
ptcb->group->tg_members = tg_members;
#endif
#ifdef CONFIG_SCHED_HAVE_PARENT
# ifdef CONFIG_SCHED_CHILD_STATUS
tg_children = chtcb->group->tg_children;
chtcb->group->tg_children = ptcb->group->tg_children;
ptcb->group->tg_children = tg_children;
# else
tg_nchildren = chtcb->group->tg_nchildren;
chtcb->group->tg_nchildren = ptcb->group->tg_nchildren;
ptcb->group->tg_nchildren = tg_nchildren;
# endif
#endif
leave_critical_section(flags);
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: exec_module
*
* Description:
* Execute a module that has been loaded into memory by load_module().
*
* Returned Value:
* This is a NuttX internal function so it follows the convention that
* 0 (OK) is returned on success and a negated errno is returned on
* failure.
*
****************************************************************************/
int exec_module(FAR struct binary_s *binp,
FAR const char *filename, FAR char * const *argv,
FAR char * const *envp,
FAR const posix_spawn_file_actions_t *actions,
FAR const posix_spawnattr_t *attr,
bool spawn)
{
FAR struct task_tcb_s *tcb;
#if defined(CONFIG_ARCH_ADDRENV) && defined(CONFIG_BUILD_KERNEL)
FAR struct arch_addrenv_s *addrenv = &binp->addrenv->addrenv;
FAR void *vheap;
char name[CONFIG_PATH_MAX];
#endif
FAR void *stackaddr = NULL;
pid_t pid;
int ret;
/* Sanity checking */
#ifdef CONFIG_DEBUG_FEATURES
if (!binp || !binp->entrypt || binp->stacksize <= 0)
{
return -EINVAL;
}
#endif
binfo("Executing %s\n", filename);
/* Allocate a TCB for the new task. */
tcb = kmm_zalloc(sizeof(struct task_tcb_s));
if (!tcb)
{
return -ENOMEM;
}
ret = binfmt_copyargv(&argv, argv);
if (ret < 0)
{
goto errout_with_tcb;
}
/* Make a copy of the environment here */
if (envp == NULL)
{
envp = environ;
}
ret = binfmt_copyenv(&envp, envp);
if (ret < 0)
{
goto errout_with_args;
}
#if defined(CONFIG_ARCH_ADDRENV) && defined(CONFIG_BUILD_KERNEL)
/* If there is no argument vector, the process name must be copied here */
if (argv == NULL)
{
strlcpy(name, filename, CONFIG_PATH_MAX);
filename = name;
}
/* Instantiate the address environment containing the user heap */
ret = addrenv_select(binp->addrenv, &binp->oldenv);
if (ret < 0)
{
berr("ERROR: addrenv_select() failed: %d\n", ret);
goto errout_with_envp;
}
ret = up_addrenv_vheap(addrenv, &vheap);
if (ret < 0)
{
berr("ERROR: up_addrenv_vheap() failed: %d\n", ret);
goto errout_with_addrenv;
}
binfo("Initialize the user heap (heapsize=%zu)\n",
up_addrenv_heapsize(addrenv));
umm_initialize(vheap, up_addrenv_heapsize(addrenv));
#endif
#if defined(CONFIG_ARCH_ADDRENV) && defined(CONFIG_ARCH_KERNEL_STACK)
/* Allocate the kernel stack */
ret = up_addrenv_kstackalloc(&tcb->cmn);
if (ret < 0)
{
berr("ERROR: up_addrenv_kstackalloc() failed: %d\n", ret);
goto errout_with_addrenv;
}
#endif
/* Note that tcb->flags are not modified. 0=normal task */
/* tcb->flags |= TCB_FLAG_TTYPE_TASK; */
/* Initialize the task */
#ifndef CONFIG_BUILD_KERNEL
stackaddr = binp->stackaddr;
#endif
if (argv && argv[0])
{
ret = nxtask_init(tcb, argv[0], binp->priority, stackaddr,
binp->stacksize, binp->entrypt, &argv[1], envp);
}
else
{
ret = nxtask_init(tcb, filename, binp->priority, stackaddr,
binp->stacksize, binp->entrypt, argv, envp);
}
if (ret < 0)
{
berr("nxtask_init() failed: %d\n", ret);
goto errout_with_addrenv;
}
/* The copied argv and envp can now be released */
binfmt_freeargv(argv);
binfmt_freeenv(envp);
#ifdef CONFIG_PIC
/* Add the D-Space address as the PIC base address. By convention, this
* must be the first allocated address space.
*/
tcb->cmn.dspace = binp->alloc[0];
/* Re-initialize the task's initial state to account for the new PIC base */
up_initial_state(&tcb->cmn);
#endif
#ifdef CONFIG_ARCH_ADDRENV
/* Attach the address environment to the new task */
ret = addrenv_attach((FAR struct tcb_s *)tcb, binp->addrenv);
if (ret < 0)
{
berr("ERROR: addrenv_attach() failed: %d\n", ret);
goto errout_with_tcbinit;
}
#endif
#ifdef CONFIG_BINFMT_CONSTRUCTORS
/* Setup a start hook that will execute all of the C++ static constructors
* on the newly created thread. The struct binary_s must persist at least
* until the new task has been started.
*/
if (binp->nctors > 0)
{
nxtask_starthook(tcb, exec_ctors, binp);
}
#endif
#ifdef CONFIG_SCHED_USER_IDENTITY
if (binp->mode & S_ISUID)
{
tcb->cmn.group->tg_euid = binp->uid;
}
if (binp->mode & S_ISGID)
{
tcb->cmn.group->tg_egid = binp->gid;
}
#endif
/* Close the file descriptors with O_CLOEXEC before active task */
files_close_onexec(&tcb->cmn);
if (!spawn)
{
exec_swap(this_task(), (FAR struct tcb_s *)tcb);
}
/* Get the assigned pid before we start the task */
pid = tcb->cmn.pid;
#if defined(CONFIG_ARCH_ADDRENV) && defined(CONFIG_BUILD_KERNEL)
/* Restore the address environment of the caller */
ret = addrenv_restore(binp->oldenv);
if (ret < 0)
{
berr("ERROR: addrenv_restore() failed: %d\n", ret);
goto errout_with_tcbinit;
}
#endif
/* Perform file actions */
if (actions != NULL)
{
ret = spawn_file_actions(&tcb->cmn, actions);
if (ret < 0)
{
goto errout_with_tcbinit;
}
}
/* Set the attributes */
if (attr)
{
ret = spawn_execattrs(pid, attr);
if (ret < 0)
{
goto errout_with_tcbinit;
}
}
/* Then activate the task at the provided priority */
nxtask_activate((FAR struct tcb_s *)tcb);
return pid;
errout_with_tcbinit:
#ifndef CONFIG_BUILD_KERNEL
if (binp->stackaddr != NULL)
{
tcb->cmn.stack_alloc_ptr = NULL;
}
#endif
nxtask_uninit(tcb);
return ret;
errout_with_addrenv:
#if defined(CONFIG_ARCH_ADDRENV) && defined(CONFIG_BUILD_KERNEL)
addrenv_restore(binp->oldenv);
errout_with_envp:
#endif
binfmt_freeenv(envp);
errout_with_args:
binfmt_freeargv(argv);
errout_with_tcb:
kmm_free(tcb);
return ret;
}
#endif /* CONFIG_BINFMT_DISABLE */
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