Browse Source
git-svn-id: http://svn.code.sf.net/p/nuttx/code/trunk@5486 42af7a65-404d-4744-a932-0658087f49c3sbg
patacongo
12 years ago
19 changed files with 389 additions and 52 deletions
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/************************************************************************************ |
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* arch/arm/src/arm/up_vfork.S |
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* |
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* Copyright (C) 2013 Gregory Nutt. All rights reserved. |
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* Author: Gregory Nutt <gnutt@nuttx.org>
|
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in |
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* the documentation and/or other materials provided with the |
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* distribution. |
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* 3. Neither the name NuttX nor the names of its contributors may be |
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* used to endorse or promote products derived from this software |
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* without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN |
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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* POSSIBILITY OF SUCH DAMAGE. |
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* |
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************************************************************************************/ |
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|
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/************************************************************************************ |
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* Included Files |
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************************************************************************************/ |
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|
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#include <nuttx/config.h> |
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/************************************************************************************ |
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* Pre-processor Definitions |
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************************************************************************************/ |
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/************************************************************************************ |
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* Global Symbols |
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************************************************************************************/ |
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.file "up_vfork.S" |
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.globl __vfork
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/************************************************************************************ |
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* Public Functions |
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************************************************************************************/ |
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/************************************************************************************ |
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* Name: vfork |
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* |
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* Description: |
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* The vfork() function has the same effect as fork(), except that the behavior is |
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* undefined if the process created by vfork() either modifies any data other than |
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* a variable of type pid_t used to store the return value from vfork(), or returns |
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* from the function in which vfork() was called, or calls any other function before |
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* successfully calling _exit() or one of the exec family of functions.
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* |
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* This thin layer implements vfork by simply calling __vfork() with the vfork() |
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* return address as an argument. |
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* |
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* Input Paremeters: |
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* None |
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* |
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* Return: |
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* Upon successful completion, vfork() returns 0 to the child process and returns |
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* the process ID of the child process to the parent process. Otherwise, -1 is |
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* returned to the parent, no child process is created, and errno is set to |
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* indicate the error.
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* |
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************************************************************************************/ |
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.globl vfork
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.type vfork, function |
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vfork: |
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/* I know, I could have used the GCC's return address builtin and done this all |
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* in C. But this works even if there is no builtin. |
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*/ |
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mov r0, lr |
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b __vfork |
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.size vfork, .-vfork |
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.end |
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/************************************************************************************ |
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* arch/arm/src/armv7-m/up_vfork.S |
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* |
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* Copyright (C) 2013 Gregory Nutt. All rights reserved. |
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* Author: Gregory Nutt <gnutt@nuttx.org>
|
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
||||
* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in |
||||
* the documentation and/or other materials provided with the |
||||
* distribution. |
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* 3. Neither the name NuttX nor the names of its contributors may be |
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* used to endorse or promote products derived from this software |
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* without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
||||
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
||||
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
||||
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN |
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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* POSSIBILITY OF SUCH DAMAGE. |
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* |
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************************************************************************************/ |
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|
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/************************************************************************************ |
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* Included Files |
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************************************************************************************/ |
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|
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#include <nuttx/config.h> |
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/************************************************************************************ |
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* Pre-processor Definitions |
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************************************************************************************/ |
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/************************************************************************************ |
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* Global Symbols |
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************************************************************************************/ |
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.syntax unified
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.thumb |
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.file "up_vfork.S" |
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.globl __vfork
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/************************************************************************************ |
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* Public Functions |
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************************************************************************************/ |
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|
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/************************************************************************************ |
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* Name: vfork |
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* |
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* Description: |
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* The vfork() function has the same effect as fork(), except that the behavior is |
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* undefined if the process created by vfork() either modifies any data other than |
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* a variable of type pid_t used to store the return value from vfork(), or returns |
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* from the function in which vfork() was called, or calls any other function before |
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* successfully calling _exit() or one of the exec family of functions.
|
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* |
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* This thin layer implements vfork by simply calling __vfork() with the vfork() |
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* return address as an argument. |
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* |
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* Input Paremeters: |
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* None |
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* |
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* Return: |
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* Upon successful completion, vfork() returns 0 to the child process and returns |
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* the process ID of the child process to the parent process. Otherwise, -1 is |
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* returned to the parent, no child process is created, and errno is set to |
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* indicate the error.
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* |
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************************************************************************************/ |
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.thumb_func |
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.globl vfork
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.type vfork, function |
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vfork: |
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/* I know, I could have used the GCC's return address builtin and done this all |
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* in C. But this works even if there is no builtin. |
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*/ |
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mov r0, lr |
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b __vfork |
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.size vfork, .-vfork |
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.end |
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/****************************************************************************
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* arch/arm/src/common/up__vfork |
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* |
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* Copyright (C) 2013 Gregory Nutt. All rights reserved. |
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* Author: Gregory Nutt <gnutt@nuttx.org> |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
||||
* |
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* 1. Redistributions of source code must retain the above copyright |
||||
* notice, this list of conditions and the following disclaimer. |
||||
* 2. Redistributions in binary form must reproduce the above copyright |
||||
* notice, this list of conditions and the following disclaimer in |
||||
* the documentation and/or other materials provided with the |
||||
* distribution. |
||||
* 3. Neither the name NuttX nor the names of its contributors may be |
||||
* used to endorse or promote products derived from this software |
||||
* without specific prior written permission. |
||||
* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
||||
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
||||
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
||||
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
||||
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
||||
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
||||
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS |
||||
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
||||
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
||||
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN |
||||
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
||||
* POSSIBILITY OF SUCH DAMAGE. |
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* |
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****************************************************************************/ |
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|
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/****************************************************************************
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* Included Files |
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****************************************************************************/ |
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#include <nuttx/config.h> |
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#include <sched.h> |
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#include <nuttx/sched.h> |
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#include "os_internal.h" |
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/****************************************************************************
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* Pre-processor Definitions |
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****************************************************************************/ |
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/* ARM requires at least a 4-byte stack alignment. For use with EABI and
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* floating point, the stack must be aligned to 8-byte addresses. |
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*/ |
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#ifndef CONFIG_STACK_ALIGNMENT |
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/* The symbol __ARM_EABI__ is defined by GCC if EABI is being used. If you
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* are not using GCC, make sure that CONFIG_STACK_ALIGNMENT is set correctly! |
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*/ |
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# ifdef __ARM_EABI__ |
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# define CONFIG_STACK_ALIGNMENT 8 |
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# else |
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# define CONFIG_STACK_ALIGNMENT 4 |
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# endif |
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#endif |
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/****************************************************************************
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* Private Functions |
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****************************************************************************/ |
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|
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/****************************************************************************
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* Public Functions |
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****************************************************************************/ |
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|
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/****************************************************************************
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* Name: __vfork |
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* |
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* Description: |
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* The vfork() function has the same effect as fork(), except that the |
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* behavior is undefined if the process created by vfork() either modifies |
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* any data other than a variable of type pid_t used to store the return |
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* value from vfork(), or returns from the function in which vfork() was |
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* called, or calls any other function before successfully calling _exit() |
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* or one of the exec family of functions.
|
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* |
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* This thin layer starts the vfork child by simply spawning a new thread |
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* that begins at the return address of vfork(). |
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* |
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* Input Paremeters: |
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* retaddr - The return address of vfork() |
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* |
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* Return: |
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* Upon successful completion, vfork() returns 0 to the child process and |
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* returns the process ID of the child process to the parent process. |
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* Otherwise, -1 is returned to the parent, no child process is created, |
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* and errno is set to indicate the error.
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* |
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****************************************************************************/ |
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pid_t __vfork(uint32_t retaddr) |
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{ |
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FAR _TCB *parent = (FAR _TCB *)g_readytorun.head; |
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size_t stacksize; |
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int priority; |
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/* Get the size of the parent task's stack. Due to alignment operations,
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* the adjusted stack size may be smaller than the stack size originally |
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* requrested. |
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*/ |
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stacksize = parent->adj_stack_size + CONFIG_STACK_ALIGNMENT - 1; |
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/* Get the current priority of the parent task */ |
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#ifdef CONFIG_PRIORITY_INHERITANCE |
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priority = parent->base_priority; /* "Normal," unboosted priority */ |
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#else |
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priority = parent->sched_priority; /* Current priority */ |
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#endif |
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|
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/* Start the child thread at the vfork return address. TASK_CREATE will
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* return the PID of the new thread. Otherwise a negative value will be |
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* returned and the errno will be set appropriately. |
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* |
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* When the registers are initialized, the return value in R0 should be |
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* cleared to zero, providing the indication to the newly started child |
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* thread. |
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*/ |
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return TASK_CREATE("init", priority, stacksize, (main_t)retaddr, |
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(const char **)NULL); |
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} |
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