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task_spawn() and posix_spawn() are NuttX OS interfaces.  In PROTECTED and KERNEL build modes, then can be reached from applications only via a system call.  Currently, the number of parameters in a system call is limited to six; these spawn function have seven parameters.  Rather than extend the maximum number of parameters across all architectures, I opted instead to marshal the seven parameters into a structure.
     *

In order to support builtin in function in protected mode, a task_spawn() system call must be supported.  Unfortunately this is overly complex because there is a (soft) limit of 6 parameters in a system call; task_spawn has seven paramters.  This is a soft limit but still difficult to extend because it involves assembly language changes to numerous architectures.  Better to get more creative.
This commit is contained in:
Gregory Nutt
2019-08-23 13:20:52 -06:00
parent bff30ff9bc
commit 3c30cf1f05
8 changed files with 164 additions and 5 deletions
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include/nuttx/spawn.h
+26 -1
View File
@@ -1,7 +1,7 @@
/****************************************************************************
* include/nuttx/spawn.h
*
* Copyright (C) 2013 Gregory Nutt. All rights reserved.
* Copyright (C) 2013, 2019 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
@@ -51,6 +51,7 @@
/****************************************************************************
* Type Definitions
****************************************************************************/
/* This enumerator identifies a file action */
enum spawn_file_actions_e
@@ -102,6 +103,27 @@ struct spawn_open_file_action_s
#define SIZEOF_OPEN_FILE_ACTION_S(n) \
(sizeof(struct spawn_open_file_action_s) + (n))
#ifdef CONFIG_LIB_SYSCALL
/* task_spawn() and posix_spawn() are NuttX OS interfaces. In PROTECTED and
* KERNEL build modes, then can be reached from applications only via a
* system call. Currently, the number of parameters in a system call is
* limited to six; these spawn function have seven parameters. Rather than
* extend the maximum number of parameters across all architectures, I opted
* instead to marshal the seven parameters into the following structure:
*/
struct spawn_syscall_parms_s
{
FAR pid_t *pid;
FAR const char *name;
main_t entry;
FAR const posix_spawn_file_actions_t *file_actions;
FAR const posix_spawnattr_t *attr;
FAR char * const *argv;
FAR char * const *envp;
};
#endif
/****************************************************************************
* Public Function Prototypes
****************************************************************************/
@@ -113,6 +135,9 @@ extern "C"
void add_file_action(FAR posix_spawn_file_actions_t *file_action,
FAR struct spawn_general_file_action_s *entry);
#ifdef CONFIG_LIB_SYSCALL
int nx_task_spawn(FAR const struct spawn_syscall_parms_s *parms);
#endif
#ifdef __cplusplus
}
include/sys/syscall.h
+2 -1
View File
@@ -128,7 +128,8 @@
#ifndef CONFIG_BUILD_KERNEL
# define SYS_task_create __SYS_task_create
# define __SYS_task_delete (__SYS_task_create + 1)
# define SYS_nx_task_spawn (__SYS_task_create + 1)
# define __SYS_task_delete (__SYS_task_create + 2)
/* pgalloc() is only available with address environments with the page
* allocator selected. MMU support from the CPU is also required.