Add execv() and execl(); Move lm3s header files for compatibility

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5492 42af7a65-404d-4744-a932-0658087f49c3

23 files changed, 669 insertions, 123 deletions

diff --git a/nuttx/ChangeLog b/nuttx/ChangeLog
index e2d8a586b..ee6b088cf 100644
--- a/nuttx/ChangeLog
+++ b/nuttx/ChangeLog
@@ -3880,4 +3880,16 @@
 	  OS layered architecture.
 	* include/unistd.h, arch/arch/src/*:  Implement a simple vfork().
 	  On initial checkin, this API is available only for ARM platforms.
+	* binfmt/binfmt_exec.c: exec() now sets the priority of the new task
+	  to the same priority as the current task (instead of the arbirtrary
+	  value of 50).
+	* libc/unisted/lib_execv.c and lib_execl.c:  New, somewhat flawed,
+	  implementations of execv() and execl().
+	* tools/cfgdefine.c:  Strips quotes from CONFIG_EXECFUNCS_SYMTAB
+	  value.
+	* arch/arm/include/lm3s/chip.h:  Move chip definitions into
+	  public include area for compatibility with other architectures.
+	* arch/arm/src/lm3s/chip:  Move register definition header files
+	  into a new chip/ sub-directory.
+
 
diff --git a/nuttx/Documentation/NuttxUserGuide.html b/nuttx/Documentation/NuttxUserGuide.html
index 5c76737e5..918b69d0f 100644
--- a/nuttx/Documentation/NuttxUserGuide.html
+++ b/nuttx/Documentation/NuttxUserGuide.html
@@ -202,6 +202,8 @@ paragraphs.
   <li><a href="#taskrestart">2.1.6 task_restart</a></li>
   <li><a href="#getpid">2.1.7 getpid</a></li>
   <li><a href="#vfork">2.1.8 vfork</a></li>
+  <li><a href="#execv">2.1.9 execv</a></li>
+  <li><a href="#execl">2.1.10 execl</a></li>
 </ul>
 
 <H3><a name="taskcreate">2.1.1 task_create</a></H3>
@@ -648,6 +650,9 @@ pid_t vfork(void);
   Compatible with the Unix interface of the same name.
 </p>
 
+<H3><a name="execv">2.1.9 execv</a></H3>
+<H3><a name="execl">2.1.10 execl</a></H3>
+
 <table width ="100%">
   <tr bgcolor="#e4e4e4">
   <td>
@@ -6798,6 +6803,12 @@ FAR char *getcwd(FAR char *buf, size_t size);
 
 int     unlink(FAR const char *pathname);
 int     rmdir(FAR const char *pathname);
+
+#ifdef CONFIG_LIBC_EXECFUNCS
+int     execl(FAR const char *path, ...);
+int     execv(FAR const char *path, FAR char *const argv[]);
+#endif
+
 int     getopt(int argc, FAR char *const argv[], FAR const char *optstring);
 </pre></ul>
 </a>
@@ -8198,7 +8209,9 @@ notify a task when a message is available on a queue.
   <li><a href="#driveroperations">Driver operations</a></li>
   <li><a href="#drvrunistdops">dup</a></li>
   <li><a href="#drvrunistdops">dup2</a></li>
+  <li><a href="#execl">execl</a></li>
   <li><a href="#mmapxip">eXecute In Place (XIP)</a></li>
+  <li><a href="#execv">execv</a></li>
   <li><a href="#exit">exit</a></li>
   <li><a href="#fatsupport">FAT File System Support</a></li>
   <li><a href="#standardio">fclose</a></li>
@@ -8333,9 +8346,9 @@ notify a task when a message is available on a queue.
   <li><a href="#mmapxip">ROMFS</a></li>
   <li><a href="#schedgetparam">sched_getparam</a></li>
   <li><a href="#schedgetprioritymax">sched_get_priority_max</a></li>
+  <li><a href="#schedgetprioritymin">sched_get_priority_min</a></li>
 </td>
 <td valign="top">
-  <li><a href="#schedgetprioritymin">sched_get_priority_min</a></li>
   <li><a href="#schedgetrrinterval">sched_get_rr_interval</a></li>
   <li><a href="#schedlockcount">sched_lockcount</a></li>
   <li><a href="#schedlock">sched_lock</a></li>
diff --git a/nuttx/arch/arm/include/lm3s/chip.h b/nuttx/arch/arm/include/lm3s/chip.h
new file mode 100644
index 000000000..d7e98a461
--- /dev/null
+++ b/nuttx/arch/arm/include/lm3s/chip.h
@@ -0,0 +1,123 @@
+/************************************************************************************
+ * arch/arm/include/lm3s/chip.h
+ *
+ *   Copyright (C) 2009-2010, 2013 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 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.
+ *
+ * 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.
+ *
+ ************************************************************************************/
+
+#ifndef __ARCH_ARM_INCLUDE_LM3S_CHIP_H
+#define __ARCH_ARM_INCLUDE_LM3S_CHIP_H
+
+/************************************************************************************
+ * Included Files
+ ************************************************************************************/
+
+#include <nuttx/config.h>
+
+/************************************************************************************
+ * Pre-processor Definitions
+ ************************************************************************************/
+
+/* Get customizations for each supported chip (only the LM3S6918 and 65 right now) */
+
+#if defined(CONFIG_ARCH_CHIP_LM3S6918)
+#  define LM3S_NTIMERS         4  /* Four general purpose timers */
+#  define LM3S_NETHCONTROLLERS 1  /* One Ethernet controller */
+#  undef  LM3S_ETHTS              /* No timestamp register */
+#  define LM3S_NSSI            2  /* Two SSI modules */
+#  define LM3S_NUARTS          2  /* Two UART modules */
+#  define LM3S_NI2C            2  /* Two I2C modules */
+#  define LM3S_NADC            1  /* One ADC module */
+#  define LM2S_NPWM            0  /* No PWM generator modules */
+#  define LM3S_NQEI            0  /* No quadrature encoders */
+#  define LM3S_NPORTS          8  /* 8 Ports (GPIOA-H) 5-38 GPIOs */
+#elif defined(CONFIG_ARCH_CHIP_LM3S6432)
+#  define LM3S_NTIMERS         3  /* Three general purpose timers */
+#  define LM3S_NETHCONTROLLERS 1  /* One Ethernet controller */
+#  undef  LM3S_ETHTS              /* No timestamp register */
+#  define LM3S_NSSI            1  /* One SSI module */
+#  define LM3S_NUARTS          2  /* Two UART modules */
+#  define LM3S_NI2C            1  /* Two I2C modules */
+#  define LM3S_NADC            1  /* One ADC module */
+#  define LM2S_NPWM            1  /* One PWM generator module */
+#  define LM3S_NQEI            0  /* No quadrature encoders */
+#  define LM3S_NPORTS          7  /* 7 Ports (GPIOA-G), 0-42 GPIOs */
+#elif defined(CONFIG_ARCH_CHIP_LM3S6965)
+#  define LM3S_NTIMERS         4  /* Four general purpose timers */
+#  define LM3S_NETHCONTROLLERS 1  /* One Ethernet controller */
+#  undef  LM3S_ETHTS              /* No timestamp register */
+#  define LM3S_NSSI            1  /* One SSI module */
+#  define LM3S_NUARTS          3  /* Three UART modules */
+#  define LM3S_NI2C            2  /* Two I2C modules */
+#  define LM3S_NADC            1  /* One ADC module */
+#  define LM2S_NPWM            3  /* Three PWM generator modules */
+#  define LM3S_NQEI            2  /* Two quadrature encoders */
+#  define LM3S_NPORTS          7  /* 7 Ports (GPIOA-G), 0-42 GPIOs */
+#elif defined(CONFIG_ARCH_CHIP_LM3S9B96) 
+#  define LM3S_NTIMERS         4  /* Four general purpose timers */
+#  define LM3S_NETHCONTROLLERS 1  /* One Ethernet controller */
+#  undef  LM3S_ETHTS              /* No timestamp register */
+#  define LM3S_NSSI            2  /* Two SSI modules */
+#  define LM3S_NUARTS          3  /* Three UART modules */
+#  define LM3S_NI2C            2  /* Two I2C modules */
+#  define LM3S_NADC            2  /* Two ADC module */
+#  define LM3S_CAN             2  /* Two CAN module */
+#  define LM3S_NPWM            4  /* Four PWM generator modules */
+#  define LM3S_NQEI            2  /* Two quadrature encoders */
+#  define LM3S_NPORTS          9  /* 9 Ports (GPIOA-H,J) 0-65 GPIOs */
+#elif defined(CONFIG_ARCH_CHIP_LM3S8962)
+#  define LM3S_NTIMERS         4  /* Four general purpose timers */
+#  define LM3S_NETHCONTROLLERS 1  /* One Ethernet controller */
+#  define LM3S_NSSI            1  /* One SSI module */
+#  define LM3S_NUARTS          3  /* Two UART modules */
+#  define LM3S_NI2C            2  /* One I2C module */
+#  define LM3S_NADC            1  /* One ADC module */
+#  define LM2S_NPWM            3  /* Three PWM generator modules */
+#  define LM3S_NQEI            2  /* Two quadrature encoders */
+#  define LM3S_NPORTS          7  /* 7 Ports (GPIOA-G), 5-42 GPIOs */
+#  define LC3S_CANCONTROLLER   1  /* One CAN controller */
+#else
+#  error "Capabilities not specified for this LM3S chip"
+#endif
+
+/************************************************************************************
+ * Public Types
+ ************************************************************************************/
+
+/************************************************************************************
+ * Public Data
+ ************************************************************************************/
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+#endif /* __ARCH_ARM_INCLUDE_LM3S_CHIP_H */
diff --git a/nuttx/arch/arm/src/lm3s/chip.h b/nuttx/arch/arm/src/lm3s/chip.h
index 1e22f6221..1e96b5222 100644
--- a/nuttx/arch/arm/src/lm3s/chip.h
+++ b/nuttx/arch/arm/src/lm3s/chip.h
@@ -41,83 +41,22 @@
  ************************************************************************************/
 
 #include <nuttx/config.h>
+#include <arch/lm3s/chip.h>
 
 /************************************************************************************
  * Pre-processor Definitions
  ************************************************************************************/
 
-/* Get customizations for each supported chip (only the LM3S6918 and 65 right now) */
-
-#if defined(CONFIG_ARCH_CHIP_LM3S6918)
-#  define LM3S_NTIMERS         4  /* Four general purpose timers */
-#  define LM3S_NETHCONTROLLERS 1  /* One Ethernet controller */
-#  undef  LM3S_ETHTS              /* No timestamp register */
-#  define LM3S_NSSI            2  /* Two SSI modules */
-#  define LM3S_NUARTS          2  /* Two UART modules */
-#  define LM3S_NI2C            2  /* Two I2C modules */
-#  define LM3S_NADC            1  /* One ADC module */
-#  define LM2S_NPWM            0  /* No PWM generator modules */
-#  define LM3S_NQEI            0  /* No quadrature encoders */
-#  define LM3S_NPORTS          8  /* 8 Ports (GPIOA-H) 5-38 GPIOs */
-#elif defined(CONFIG_ARCH_CHIP_LM3S6432)
-#  define LM3S_NTIMERS         3  /* Three general purpose timers */
-#  define LM3S_NETHCONTROLLERS 1  /* One Ethernet controller */
-#  undef  LM3S_ETHTS              /* No timestamp register */
-#  define LM3S_NSSI            1  /* One SSI module */
-#  define LM3S_NUARTS          2  /* Two UART modules */
-#  define LM3S_NI2C            1  /* Two I2C modules */
-#  define LM3S_NADC            1  /* One ADC module */
-#  define LM2S_NPWM            1  /* One PWM generator module */
-#  define LM3S_NQEI            0  /* No quadrature encoders */
-#  define LM3S_NPORTS          7  /* 7 Ports (GPIOA-G), 0-42 GPIOs */
-#elif defined(CONFIG_ARCH_CHIP_LM3S6965)
-#  define LM3S_NTIMERS         4  /* Four general purpose timers */
-#  define LM3S_NETHCONTROLLERS 1  /* One Ethernet controller */
-#  undef  LM3S_ETHTS              /* No timestamp register */
-#  define LM3S_NSSI            1  /* One SSI module */
-#  define LM3S_NUARTS          3  /* Three UART modules */
-#  define LM3S_NI2C            2  /* Two I2C modules */
-#  define LM3S_NADC            1  /* One ADC module */
-#  define LM2S_NPWM            3  /* Three PWM generator modules */
-#  define LM3S_NQEI            2  /* Two quadrature encoders */
-#  define LM3S_NPORTS          7  /* 7 Ports (GPIOA-G), 0-42 GPIOs */
-#elif defined(CONFIG_ARCH_CHIP_LM3S9B96) 
-#  define LM3S_NTIMERS         4  /* Four general purpose timers */
-#  define LM3S_NETHCONTROLLERS 1  /* One Ethernet controller */
-#  undef  LM3S_ETHTS              /* No timestamp register */
-#  define LM3S_NSSI            2  /* Two SSI modules */
-#  define LM3S_NUARTS          3  /* Three UART modules */
-#  define LM3S_NI2C            2  /* Two I2C modules */
-#  define LM3S_NADC            2  /* Two ADC module */
-#  define LM3S_CAN             2  /* Two CAN module */
-#  define LM3S_NPWM            4  /* Four PWM generator modules */
-#  define LM3S_NQEI            2  /* Two quadrature encoders */
-#  define LM3S_NPORTS          9  /* 9 Ports (GPIOA-H,J) 0-65 GPIOs */
-#elif defined(CONFIG_ARCH_CHIP_LM3S8962)
-#  define LM3S_NTIMERS         4  /* Four general purpose timers */
-#  define LM3S_NETHCONTROLLERS 1  /* One Ethernet controller */
-#  define LM3S_NSSI            1  /* One SSI module */
-#  define LM3S_NUARTS          3  /* Two UART modules */
-#  define LM3S_NI2C            2  /* One I2C module */
-#  define LM3S_NADC            1  /* One ADC module */
-#  define LM2S_NPWM            3  /* Three PWM generator modules */
-#  define LM3S_NQEI            2  /* Two quadrature encoders */
-#  define LM3S_NPORTS          7  /* 7 Ports (GPIOA-G), 5-42 GPIOs */
-#  define LC3S_CANCONTROLLER   1  /* One CAN controller */
-#else
-#  error "Capabilities not specified for this LM3S chip"
-#endif
-
 /* Then get all of the register definitions */
 
-#include "lm3s_memorymap.h"      /* Memory map */
-#include "lm3s_syscontrol.h"     /* System control module */
-#include "lm3s_gpio.h"           /* GPIO modules */
-#include "lm3s_uart.h"           /* UART modules */
-#include "lm3s_i2c.h"            /* I2C modules */
-#include "lm3s_ssi.h"            /* SSI modules */
-#include "lm3s_ethernet.h"       /* Ethernet MAC and PHY */
-#include "lm3s_flash.h"          /* FLASH */
+#include "chip/lm_memorymap.h"    /* Memory map */
+#include "chip/lm3s_syscontrol.h" /* System control module */
+#include "chip/lm3s_gpio.h"       /* GPIO modules */
+#include "chip/lm3s_uart.h"       /* UART modules */
+#include "chip/lm3s_i2c.h"        /* I2C modules */
+#include "chip/lm3s_ssi.h"        /* SSI modules */
+#include "chip/lm3s_ethernet.h"   /* Ethernet MAC and PHY */
+#include "chip/lm3s_flash.h"      /* FLASH */
 
 /************************************************************************************
  * Public Types
diff --git a/nuttx/arch/arm/src/lm3s/lm3s_epi.h b/nuttx/arch/arm/src/lm3s/chip/lm3s_epi.h
index 90c9bfb7f..5b54d44ac 100644
--- a/nuttx/arch/arm/src/lm3s/lm3s_epi.h
+++ b/nuttx/arch/arm/src/lm3s/chip/lm3s_epi.h
@@ -1,7 +1,7 @@
 /************************************************************************************
- * arch/arm/src/lm3s/lm3s_epi.h
+ * arch/arm/src/lm3s/chip/lm3s_epi.h
  *
- *   Copyright (C) 2009-2012 Max Neklyudov. All rights reserved.
+ *   Copyright (C) 2009-2013 Max Neklyudov. All rights reserved.
  *   Author: Max Neklyudov <macscomp@gmail.com>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -33,8 +33,8 @@
  *
  ************************************************************************************/
 
-#ifndef __ARCH_ARM_SRC_LM3S_LM3S_EPI_H
-#define __ARCH_ARM_SRC_LM3S_LM3S_EPI_H
+#ifndef __ARCH_ARM_SRC_LM3S_CHIP_LM3S_EPI_H
+#define __ARCH_ARM_SRC_LM3S_CHIP_LM3S_EPI_H
 
 /************************************************************************************
  * Included Files
@@ -110,4 +110,4 @@
 #define EPI_BAUD_COUNT0_MASK          (0xFFFF << EPI_BAUD_COUNT0_SHIFT)
 #  define EPI_BAUD_COUNT0(n)          ((n) << EPI_BAUD_COUNT0_SHIFT)
 
-#endif /* __ARCH_ARM_SRC_LM3S_LM3S_EPI_H */
+#endif /* __ARCH_ARM_SRC_LM3S_CHIP_LM3S_EPI_H */
diff --git a/nuttx/arch/arm/src/lm3s/lm3s_ethernet.h b/nuttx/arch/arm/src/lm3s/chip/lm3s_ethernet.h
index 71833b271..940686e7d 100644
--- a/nuttx/arch/arm/src/lm3s/lm3s_ethernet.h
+++ b/nuttx/arch/arm/src/lm3s/chip/lm3s_ethernet.h
@@ -1,7 +1,7 @@
 /************************************************************************************
- * arch/arm/src/lm3s/lm3s_ethernet.h
+ * arch/arm/src/lm3s/chip/lm3s_ethernet.h
  *
- *   Copyright (C) 2009-2010, 2012 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2009-2010, 2012-2013 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -33,8 +33,8 @@
  *
  ************************************************************************************/
 
-#ifndef __ARCH_ARM_SRC_LM3S_LM3S_ETHERNET_H
-#define __ARCH_ARM_SRC_LM3S_LM3S_ETHERNET_H
+#ifndef __ARCH_ARM_SRC_LM3S_CHIP_LM3S_ETHERNET_H
+#define __ARCH_ARM_SRC_LM3S_CHIP_LM3S_ETHERNET_H
 
 /************************************************************************************
  * Included Files
@@ -200,4 +200,4 @@
  * Public Function Prototypes
  ************************************************************************************/
 
-#endif /* __ARCH_ARM_SRC_LM3S_LM3S_ETHERNET_H */
+#endif /* __ARCH_ARM_SRC_LM3S_CHIP_LM3S_ETHERNET_H */
diff --git a/nuttx/arch/arm/src/lm3s/lm3s_flash.h b/nuttx/arch/arm/src/lm3s/chip/lm3s_flash.h
index 83e388921..2bd8956b0 100644
--- a/nuttx/arch/arm/src/lm3s/lm3s_flash.h
+++ b/nuttx/arch/arm/src/lm3s/chip/lm3s_flash.h
@@ -1,7 +1,7 @@
 /************************************************************************************
- * arch/arm/src/lm3s/lm3s_flash.h
+ * arch/arm/src/lm3s/chip/lm3s_flash.h
  *
- *   Copyright (C) 2009 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2009, 2013 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -33,8 +33,8 @@
  *
  ************************************************************************************/
 
-#ifndef __ARCH_ARM_SRC_LM3S_LM3S_FLASH_H
-#define __ARCH_ARM_SRC_LM3S_LM3S_FLASH_H
+#ifndef __ARCH_ARM_SRC_LM3S_CHIP_LM3S_FLASH_H
+#define __ARCH_ARM_SRC_LM3S_CHIP_LM3S_FLASH_H
 
 /************************************************************************************
  * Included Files
@@ -125,4 +125,4 @@
  * Public Function Prototypes
  ************************************************************************************/
 
-#endif /* __ARCH_ARM_SRC_LM3S_LM3S_FLASH_H */
+#endif /* __ARCH_ARM_SRC_LM3S_CHIP_LM3S_FLASH_H */
diff --git a/nuttx/arch/arm/src/lm3s/lm3s_gpio.h b/nuttx/arch/arm/src/lm3s/chip/lm3s_gpio.h
index 066666432..7253c1e7a 100644
--- a/nuttx/arch/arm/src/lm3s/lm3s_gpio.h
+++ b/nuttx/arch/arm/src/lm3s/chip/lm3s_gpio.h
@@ -1,7 +1,7 @@
 /************************************************************************************
- * arch/arm/src/lm3s/lm3s_gpio.h
+ * arch/arm/src/lm3s/chip/lm3s_gpio.h
  *
- *   Copyright (C) 2009-2010 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2009-2010, 2013 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -33,8 +33,8 @@
  *
  ************************************************************************************/
 
-#ifndef __ARCH_ARM_SRC_LM3S_LM3S_GPIO_H
-#define __ARCH_ARM_SRC_LM3S_LM3S_GPIO_H
+#ifndef __ARCH_ARM_SRC_LM3S_CHIP_LM3S_GPIO_H
+#define __ARCH_ARM_SRC_LM3S_CHIP_LM3S_GPIO_H
 
 /************************************************************************************
  * Included Files
@@ -392,4 +392,4 @@
  * Public Function Prototypes
  ************************************************************************************/
 
-#endif /* __ARCH_ARM_SRC_LM3S_LM3S_GPIO_H */
+#endif /* __ARCH_ARM_SRC_LM3S_CHIP_LM3S_GPIO_H */
diff --git a/nuttx/arch/arm/src/lm3s/lm3s_i2c.h b/nuttx/arch/arm/src/lm3s/chip/lm3s_i2c.h
index a5f0567b9..71ebe8fcf 100644
--- a/nuttx/arch/arm/src/lm3s/lm3s_i2c.h
+++ b/nuttx/arch/arm/src/lm3s/chip/lm3s_i2c.h
@@ -1,7 +1,7 @@
 /************************************************************************************
- * arch/arm/src/lm3s/lm3s_i2c.h
+ * arch/arm/src/lm3s/chip/lm3s_i2c.h
  *
- *   Copyright (C) 2009 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2009, 2013 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -33,8 +33,8 @@
  *
  ************************************************************************************/
 
-#ifndef __ARCH_ARM_SRC_LM3S_LM3S_I2C_H
-#define __ARCH_ARM_SRC_LM3S_LM3S_I2C_H
+#ifndef __ARCH_ARM_SRC_LM3S_CHIP_LM3S_I2C_H
+#define __ARCH_ARM_SRC_LM3S_CHIP_LM3S_I2C_H
 
 /************************************************************************************
  * Included Files
@@ -244,4 +244,4 @@
  * Public Function Prototypes
  ****************************************************************************/
 
-#endif /* __ARCH_ARM_SRC_LM3S_LM3S_I2C_H */
+#endif /* __ARCH_ARM_SRC_LM3S_CHIP_LM3S_I2C_H */
diff --git a/nuttx/arch/arm/src/lm3s/lm3s_memorymap.h b/nuttx/arch/arm/src/lm3s/chip/lm3s_memorymap.h
index be0d8b58d..31dc2b249 100644
--- a/nuttx/arch/arm/src/lm3s/lm3s_memorymap.h
+++ b/nuttx/arch/arm/src/lm3s/chip/lm3s_memorymap.h
@@ -1,5 +1,5 @@
 /************************************************************************************
- * arch/arm/src/lm3s/lm3s_memorymap.h
+ * arch/arm/src/lm3s/chip/lm3s_memorymap.h
  *
  *   Copyright (C) 2009-2010 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
@@ -33,8 +33,8 @@
  *
  ************************************************************************************/
 
-#ifndef __ARCH_ARM_SRC_LM3S_LM3S_MEMORYMAP_H
-#define __ARCH_ARM_SRC_LM3S_LM3S_MEMORYMAP_H
+#ifndef __ARCH_ARM_SRC_LM3S_CHIP_LM3S_MEMORYMAP_H
+#define __ARCH_ARM_SRC_LM3S_CHIP_LM3S_MEMORYMAP_H
 
 /************************************************************************************
  * Included Files
@@ -357,4 +357,4 @@
  * Public Function Prototypes
  ************************************************************************************/
 
-#endif /* __ARCH_ARM_SRC_LM3S_LM3S_MEMORYMAP_H */
+#endif /* __ARCH_ARM_SRC_LM3S_CHIP_LM3S_MEMORYMAP_H */
diff --git a/nuttx/arch/arm/src/lm3s/lm3s_ssi.h b/nuttx/arch/arm/src/lm3s/chip/lm3s_ssi.h
index 482dab326..b56ca77cb 100644
--- a/nuttx/arch/arm/src/lm3s/lm3s_ssi.h
+++ b/nuttx/arch/arm/src/lm3s/chip/lm3s_ssi.h
@@ -1,7 +1,7 @@
 /************************************************************************************
- * arch/arm/src/lm3s/lm3s_ssi.h
+ * arch/arm/src/lm3s/chip/lm3s_ssi.h
  *
- *   Copyright (C) 2009 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2009, 2013 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -33,8 +33,8 @@
  *
  ************************************************************************************/
 
-#ifndef __ARCH_ARM_SRC_LM3S_LM3S_SSI_H
-#define __ARCH_ARM_SRC_LM3S_LM3S_SSI_H
+#ifndef __ARCH_ARM_SRC_LM3S_CHIP_LM3S_SSI_H
+#define __ARCH_ARM_SRC_LM3S_CHIP_LM3S_SSI_H
 
 /************************************************************************************
  * Included Files
@@ -232,4 +232,4 @@
  ************************************************************************************/
 
 #endif /* LM3S_NSSI > 0 */
-#endif /* __ARCH_ARM_SRC_LM3S_LM3S_SSI_H */
+#endif /* __ARCH_ARM_SRC_LM3S_CHIP_LM3S_SSI_H */
diff --git a/nuttx/arch/arm/src/lm3s/lm3s_syscontrol.h b/nuttx/arch/arm/src/lm3s/chip/lm3s_syscontrol.h
index c59b921c4..d66cfeb47 100644
--- a/nuttx/arch/arm/src/lm3s/lm3s_syscontrol.h
+++ b/nuttx/arch/arm/src/lm3s/chip/lm3s_syscontrol.h
@@ -1,7 +1,7 @@
 /************************************************************************************
- * arch/arm/src/lm3s/lm3s_syscontrol.h
+ * arch/arm/src/lm3s/chip/lm3s_syscontrol.h
  *
- *   Copyright (C) 2009-2010 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2009-2010, 2013 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -33,8 +33,8 @@
  *
  ************************************************************************************/
 
-#ifndef __ARCH_ARM_SRC_LM3S_LM3S_SYSCONTROL_H
-#define __ARCH_ARM_SRC_LM3S_LM3S_SYSCONTROL_H
+#ifndef __ARCH_ARM_SRC_LM3S_CHIP_LM3S_SYSCONTROL_H
+#define __ARCH_ARM_SRC_LM3S_CHIP_LM3S_SYSCONTROL_H
 
 /************************************************************************************
  * Included Files
@@ -492,4 +492,4 @@
  * Public Functions
  ************************************************************************************/
 
-#endif /* __ARCH_ARM_SRC_LM3S_LM3S_SYSCONTROL_H */
+#endif /* __ARCH_ARM_SRC_LM3S_CHIP_LM3S_SYSCONTROL_H */
diff --git a/nuttx/arch/arm/src/lm3s/lm3s_timer.h b/nuttx/arch/arm/src/lm3s/chip/lm3s_timer.h
index 7c4166293..649737f13 100644
--- a/nuttx/arch/arm/src/lm3s/lm3s_timer.h
+++ b/nuttx/arch/arm/src/lm3s/chip/lm3s_timer.h
@@ -1,5 +1,5 @@
 /************************************************************************************
- * arch/arm/src/lm3s/lm3s_timer.h
+ * arch/arm/src/lm3s/chip/lm3s_timer.h
  *
  *   Copyright (C) 2012 Max Nekludov. All rights reserved.
  *   Author: Max Nekludov <macscomp@gmail.com>
@@ -33,8 +33,8 @@
  *
  ************************************************************************************/
 
-#ifndef __ARCH_ARM_SRC_LM3S_LM3S_TIMER_H
-#define __ARCH_ARM_SRC_LM3S_LM3S_TIMER_H
+#ifndef __ARCH_ARM_SRC_LM3S_CHIP_LM3S_TIMER_H
+#define __ARCH_ARM_SRC_LM3S_CHIP_LM3S_TIMER_H
 
 /************************************************************************************
  * Included Files
@@ -122,4 +122,4 @@
 #define TIMER_GPTMICR_TATOCINT_SHIFT     0    /* Bits 0:   GPTM Timer A Time-Out Raw Interrupt Clear*/
 #define TIMER_GPTMICR_TATOCINT_MASK      (0x01 << TIMER_GPTMICR_TATOCINT_SHIFT)
 
-#endif /* __ARCH_ARM_SRC_LM3S_LM3S_TIMER_H */
+#endif /* __ARCH_ARM_SRC_LM3S_CHIP_LM3S_TIMER_H */
diff --git a/nuttx/arch/arm/src/lm3s/lm3s_uart.h b/nuttx/arch/arm/src/lm3s/chip/lm3s_uart.h
index 91bfb2266..0fef5ccf7 100644
--- a/nuttx/arch/arm/src/lm3s/lm3s_uart.h
+++ b/nuttx/arch/arm/src/lm3s/chip/lm3s_uart.h
@@ -1,7 +1,7 @@
 /************************************************************************************
- * arch/arm/src/lm3s/lm3s_uart.h
+ * arch/arm/src/lm3s/chip/lm3s_uart.h
  *
- *   Copyright (C) 2009 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2009, 2013 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -33,8 +33,8 @@
  *
  ************************************************************************************/
 
-#ifndef __ARCH_ARM_SRC_LM3S_LM3S_UART_H
-#define __ARCH_ARM_SRC_LM3S_LM3S_UART_H
+#ifndef __ARCH_ARM_SRC_LM3S_CHIP_LM3S_UART_H
+#define __ARCH_ARM_SRC_LM3S_CHIP_LM3S_UART_H
 
 /************************************************************************************
  * Included Files
@@ -344,4 +344,4 @@
  * Public Functions
  ************************************************************************************/
 
-#endif /* __ARCH_ARM_SRC_LM3S_LM3S_UART_H */
+#endif /* __ARCH_ARM_SRC_LM3S_CHIP_LM3S_UART_H */
diff --git a/nuttx/arch/arm/src/lm3s/chip/lm_memorymap.h b/nuttx/arch/arm/src/lm3s/chip/lm_memorymap.h
new file mode 100644
index 000000000..c52857847
--- /dev/null
+++ b/nuttx/arch/arm/src/lm3s/chip/lm_memorymap.h
@@ -0,0 +1,69 @@
+/************************************************************************************
+ * arch/arm/src/lm3s/chip/lm_memorymap.h
+ *
+ *   Copyright (C) 2013 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 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.
+ *
+ * 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.
+ *
+ ************************************************************************************/
+
+#ifndef __ARCH_ARM_SRC_LM3S_CHIP_LM_MEMORYMAP_H
+#define __ARCH_ARM_SRC_LM3S_CHIP_LM_MEMORYMAP_H
+
+/************************************************************************************
+ * Included Files
+ ************************************************************************************/
+
+#include <nuttx/config.h>
+
+/* Include the memory map file for the specific Stellaris chip */
+
+#ifdef CONFIG_ARCH_CHIP_LM3S
+#  include "chip/lm3s_memorymap.h"
+#else
+#  error "Unsupported Stellaris memory map"
+#endif
+
+/************************************************************************************
+ * Pre-processor Definitions
+ ************************************************************************************/
+
+/************************************************************************************
+ * Public Types
+ ************************************************************************************/
+
+/************************************************************************************
+ * Public Data
+ ************************************************************************************/
+
+/************************************************************************************
+ * Public Function Prototypes
+ ************************************************************************************/
+
+#endif /* __ARCH_ARM_SRC_LM3S_CHIP_LM_MEMORYMAP_H */
diff --git a/nuttx/binfmt/binfmt_exec.c b/nuttx/binfmt/binfmt_exec.c
index 60e8d8efd..d5e274710 100644
--- a/nuttx/binfmt/binfmt_exec.c
+++ b/nuttx/binfmt/binfmt_exec.c
@@ -1,7 +1,7 @@
 /****************************************************************************
  * binfmt/binfmt_exec.c
  *
- *   Copyright (C) 2009 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2009, 2013 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -75,7 +75,8 @@
  *
  * Description:
  *   This is a convenience function that wraps load_ and exec_module into
- *   one call.
+ *   one call.  The priority of the executed program is set to be the
+ *   same as the priority of the calling thread.
  *
  * Input Parameter:
  *   filename - Fulll path to the binary to be loaded
@@ -94,8 +95,20 @@ int exec(FAR const char *filename, FAR const char **argv,
          FAR const struct symtab_s *exports, int nexports)
 {
   struct binary_s bin;
+  struct sched_param param;
   int ret;
 
+  /* Get the priority of this thread */
+
+  ret = sched_getparam(0, &param);
+  if (ret < 0)
+    {
+      bdbg("ERROR: sched_getparam failed: %d\n", errno);
+      return ERROR;
+    }
+  
+  /* Load the module into memory */
+
   memset(&bin, 0, sizeof(struct binary_s));
   bin.filename = filename;
   bin.exports  = exports;
@@ -108,7 +121,9 @@ int exec(FAR const char *filename, FAR const char **argv,
       return ERROR;
     }
 
-  ret = exec_module(&bin, 50);
+  /* Then start the module at the priority of this thread */
+
+  ret = exec_module(&bin, param.sched_priority);
   if (ret < 0)
     {
       bdbg("ERROR: Failed to execute program '%s'\n", filename);
diff --git a/nuttx/include/nuttx/binfmt/binfmt.h b/nuttx/include/nuttx/binfmt/binfmt.h
index 6df5190d2..480e82c09 100644
--- a/nuttx/include/nuttx/binfmt/binfmt.h
+++ b/nuttx/include/nuttx/binfmt/binfmt.h
@@ -228,7 +228,8 @@ int exec_module(FAR const struct binary_s *bin, int priority);
  *
  * Description:
  *   This is a convenience function that wraps load_ and exec_module into
- *   one call.
+ *   one call.  The priority of the executed program is set to be the
+ *   same as the priority of the calling thread.
  *
  * Input Parameter:
  *   filename - Fulll path to the binary to be loaded
diff --git a/nuttx/include/unistd.h b/nuttx/include/unistd.h
index ddb6880f4..d2ace79fa 100644
--- a/nuttx/include/unistd.h
+++ b/nuttx/include/unistd.h
@@ -160,6 +160,13 @@ EXTERN FAR char *getcwd(FAR char *buf, size_t size);
 EXTERN int     unlink(FAR const char *pathname);
 EXTERN int     rmdir(FAR const char *pathname);
 
+/* Execution of programs from files */
+
+#ifdef CONFIG_LIBC_EXECFUNCS
+EXTERN int     execl(FAR const char *path, ...);
+EXTERN int     execv(FAR const char *path, FAR char *const argv[]);
+#endif
+
 /* Other */
 
 EXTERN int     getopt(int argc, FAR char *const argv[], FAR const char *optstring);
diff --git a/nuttx/libc/Kconfig b/nuttx/libc/Kconfig
index 0ae56ac57..699b3ebb2 100644
--- a/nuttx/libc/Kconfig
+++ b/nuttx/libc/Kconfig
@@ -71,6 +71,54 @@ config EOL_IS_EITHER_CRLF
 
 endchoice
 
+config LIBC_EXECFUNCS
+	bool "Enable exec[l|v] Support"
+	default n
+	depends on !BINFMT_DISABLE
+	---help---
+		Enable support for the exec[l|v] family of functions that can be
+		used to start other programs, terminating the current program.
+		Typical usage is (1) first call vfork() to create a new thread, then
+		(2) call exec[l|v] to replace the new thread with a program from the
+		file system.
+
+		NOTE 1: This two step process start is completely unnecessary in
+		NuttX and is provided only for compatibily with Unix systems.  These
+		functions are essentially just wrapper functions that (1) call the
+		non-standard binfmt function 'exec', and then (2) exit(0).  Since
+		the new thread will be terminated by the exec[l|v] call, it really
+		served no purpose other than to suport Unix compatility.
+
+		NOTE 2: Support for exec[l|v] is conditional because is requires
+		additional support for symbol tables that will not be available in
+		the typical system.
+
+if LIBC_EXECFUNCS
+
+config EXECFUNCS_SYMTAB
+	string "Symbol table used by exec[l|v]"
+	default "g_symtab"
+	---help---
+		The exec[l|v] functions are wrapper functions that (1) call the non-
+		standard binfmt function 'exec', and then (2) exit(0).  The binfmt
+		function 'exec' needs to have (1) a symbol table that provides the
+		list of symbols exported by the base code, and (2) the number of
+		symbols in that table.  This selection provides the name of that
+		symbol table.
+
+config EXECFUNCS_NSYMBOLS
+	int "Number of Symbols in the Table"
+	default 0
+	---help---
+		The exec[l|v] functions are wrapper functions that (1) call the non-
+		standard binfmt function 'exec', and then (2) exit(0).  The binfmt
+		function 'exec' needs to have (1) a symbol table that provides the
+		list of symbols exported by the base code, and (2) the number of
+		symbols in that table.  This selection provides the number of
+		symbols in the symbol table.
+
+endif
+
 config LIBC_STRERROR
 	bool "Enable strerror"
 	default n
diff --git a/nuttx/libc/unistd/Make.defs b/nuttx/libc/unistd/Make.defs
index 67fce9b1d..3811673bf 100644
--- a/nuttx/libc/unistd/Make.defs
+++ b/nuttx/libc/unistd/Make.defs
@@ -41,6 +41,10 @@ ifneq ($(CONFIG_NFILE_DESCRIPTORS),0)
 ifneq ($(CONFIG_DISABLE_ENVIRON),y)
 CSRCS +=  lib_chdir.c lib_getcwd.c
 endif
+
+ifeq ($(CONFIG_LIBC_EXECFUNCS),y)
+CSRCS +=  lib_execl.c lib_execv.c
+endif
 endif
 
 # Add the unistd directory to the build
diff --git a/nuttx/libc/unistd/lib_execl.c b/nuttx/libc/unistd/lib_execl.c
new file mode 100644
index 000000000..ac3147343
--- /dev/null
+++ b/nuttx/libc/unistd/lib_execl.c
@@ -0,0 +1,146 @@
+/****************************************************************************
+ * libc/unistd/lib_execl.c
+ *
+ *   Copyright (C) 2013 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 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.
+ *
+ * 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.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdarg.h>
+#include <unistd.h>
+
+#ifdef CONFIG_LIBC_EXECFUNCS
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: execl
+ *
+ * Description:
+ *   The standard 'exec' family of functions will replace the current process
+ *   image with a new process image. The new image will be constructed from a
+ *   regular, executable file called the new process image file. There will
+ *   be no return from a successful exec, because the calling process image
+ *   is overlaid by the new process image.
+ *
+ *   Simplified 'execl()' and 'execv()' functions are provided by NuttX for
+ *   compatibility.  NuttX is a tiny embedded RTOS that does not support
+ *   processes and hence the concept of overlaying a tasks process image with
+ *   a new process image does not make any sense.  In NuttX, these functions
+ *   are wrapper functions that:
+ *
+ *     1. Call the non-standard binfmt function 'exec', and then
+ *     2. exit(0).
+ *
+ *   Note the inefficiency when 'exec[l|v]()' is called in the normal, two-
+ *   step process:  (1) first call vfork() to create a new thread, then (2)
+ *   call 'exec[l|v]()' to replace the new thread with a program from the
+ *   file system.  Since the new thread will be terminated by the
+ *   'exec[l|v]()' call, it really served no purpose other than to suport
+ *   Unix compatility.
+ *
+ *   The non-standard binfmt function 'exec()' needs to have (1) a symbol
+ *   table that provides the list of symbols exported by the base code, and
+ *   (2) the number of symbols in that table.  This information is currently
+ *   provided to 'exec()' from 'exec[l|v]()' via NuttX configuration settings:
+ *
+ *     CONFIG_LIBC_EXECFUNCS     : Enable exec[l|v] Support
+ *     CONFIG_EXECFUNCS_SYMTAB   : Symbol table used by exec[l|v]
+ *     CONFIG_EXECFUNCS_NSYMBOLS : Number of Symbols in the Table
+ *
+ *   As a result of the above, the current implementations of 'execl()' and
+ *   'execv()' suffer from some incompatibilities that may or may not be
+ *   addressed in a future version of NuttX.  Other than just being an
+ *   inefficient use of MCU resource, the most serious of these is that
+ *   the exec'ed task will not have the same task ID as the vfork'ed
+ *   function.  So the parent function cannot know the ID of the exec'ed
+ *   task.
+ *
+ * Input Parameters:
+ *   path - The path to the program to be executed.  If CONFIG_BINFMT_EXEPATH
+ *     is defined in the configuration, then this may be a relative path
+ *     from the current working directory.  Otherwise, path must be the
+ *     absolute path to the program.
+ *   arg0,... - A list of the string arguments to be recevied by the
+ *     program.  Zero indicates the end of the list.
+ *
+ * Returned Value:
+ *   This function does not return on success.  On failure, it will return
+ *   -1 (ERROR) and will set the 'errno' value appropriately.
+ *
+ ****************************************************************************/
+
+int execl(FAR const char *path, ...)
+{
+  FAR char *argv[CONFIG_MAX_TASK_ARGS+1];
+  va_list ap;
+  int argc;
+
+  /* Collect the arguments into the argv[] array */
+
+  va_start(ap, path);
+  for (argc = 0; argc < CONFIG_MAX_TASK_ARGS; argc++)
+    {
+      argv[argc] = va_arg(ap, FAR char *);
+      if (argv[argc] == NULL)
+        {
+          break;
+        }
+    }
+
+  argv[CONFIG_MAX_TASK_ARGS] = NULL;
+  va_end(ap);
+
+  /* Then let execv() do the real work */
+
+  return execv(path, (char * const *)&argv);
+}
+
+#endif /* CONFIG_LIBC_EXECFUNCS */
\ No newline at end of file
diff --git a/nuttx/libc/unistd/lib_execv.c b/nuttx/libc/unistd/lib_execv.c
new file mode 100644
index 000000000..cad8ee307
--- /dev/null
+++ b/nuttx/libc/unistd/lib_execv.c
@@ -0,0 +1,168 @@
+/****************************************************************************
+ * libc/unistd/lib_execv.c
+ *
+ *   Copyright (C) 2013 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 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.
+ *
+ * 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.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <debug.h>
+
+#include <nuttx/binfmt/binfmt.h>
+
+#ifdef CONFIG_LIBC_EXECFUNCS
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+/* If CONFIG_LIBC_EXECFUNCS is defined in the configuration, then the
+ * following must also be defined:
+ */
+
+/* Symbol table used by exec[l|v] */
+
+#ifndef CONFIG_EXECFUNCS_SYMTAB
+#  error "CONFIG_EXECFUNCS_SYMTAB must be defined"
+#endif
+
+/* Number of Symbols in the Table */
+
+#ifndef CONFIG_EXECFUNCS_NSYMBOLS
+#  error "CONFIG_EXECFUNCS_NSYMBOLS must be defined"
+#endif
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+extern struct symtab_s CONFIG_EXECFUNCS_SYMTAB;
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: execv
+ *
+ * Description:
+ *   The standard 'exec' family of functions will replace the current process
+ *   image with a new process image. The new image will be constructed from a
+ *   regular, executable file called the new process image file. There will
+ *   be no return from a successful exec, because the calling process image
+ *   is overlaid by the new process image.
+ *
+ *   Simplified 'execl()' and 'execv()' functions are provided by NuttX for
+ *   compatibility.  NuttX is a tiny embedded RTOS that does not support
+ *   processes and hence the concept of overlaying a tasks process image with
+ *   a new process image does not make any sense.  In NuttX, these functions
+ *   are wrapper functions that:
+ *
+ *     1. Call the non-standard binfmt function 'exec', and then
+ *     2. exit(0).
+ *
+ *   Note the inefficiency when 'exec[l|v]()' is called in the normal, two-
+ *   step process:  (1) first call vfork() to create a new thread, then (2)
+ *   call 'exec[l|v]()' to replace the new thread with a program from the
+ *   file system.  Since the new thread will be terminated by the
+ *   'exec[l|v]()' call, it really served no purpose other than to suport
+ *   Unix compatility.
+ *
+ *   The non-standard binfmt function 'exec()' needs to have (1) a symbol
+ *   table that provides the list of symbols exported by the base code, and
+ *   (2) the number of symbols in that table.  This information is currently
+ *   provided to 'exec()' from 'exec[l|v]()' via NuttX configuration settings:
+ *
+ *     CONFIG_LIBC_EXECFUNCS     : Enable exec[l|v] Support
+ *     CONFIG_EXECFUNCS_SYMTAB   : Symbol table used by exec[l|v]
+ *     CONFIG_EXECFUNCS_NSYMBOLS : Number of Symbols in the Table
+ *
+ *   As a result of the above, the current implementations of 'execl()' and
+ *   'execv()' suffer from some incompatibilities that may or may not be
+ *   addressed in a future version of NuttX.  Other than just being an
+ *   inefficient use of MCU resource, the most serious of these is that
+ *   the exec'ed task will not have the same task ID as the vfork'ed
+ *   function.  So the parent function cannot know the ID of the exec'ed
+ *   task.
+ *
+ * Input Parameters:
+ *   path - The path to the program to be executed.  If CONFIG_BINFMT_EXEPATH
+ *     is defined in the configuration, then this may be a relative path
+ *     from the current working directory.  Otherwise, path must be the
+ *     absolute path to the program.
+ *   argv - A pointer to an array of string arguments.  The end of the
+ *     array is indicated with a NULL entry.
+ *
+ * Returned Value:
+ *   This function does not return on success.  On failure, it will return
+ *   -1 (ERROR) and will set the 'errno' value appropriately.
+ *
+ ****************************************************************************/
+
+int execv(FAR const char *path, FAR char *const argv[])
+{
+  int ret;
+
+  /* Start the task */
+
+  ret = exec(path, (FAR const char **)argv,
+             &CONFIG_EXECFUNCS_SYMTAB, CONFIG_EXECFUNCS_NSYMBOLS);
+
+  if (ret < 0)
+    {
+      sdbg("exec failed: %d\n", errno);
+      return ERROR;
+    }
+
+  /* Then exit */
+
+  exit(0);
+
+  /* We should not get here, but might be needed by some compilers.  Other,
+   * smarter compilers might complain that this code is unreachable.  You just
+   * can't win.
+   */
+
+  return ERROR;
+}
+
+#endif /* CONFIG_LIBC_EXECFUNCS */
\ No newline at end of file
diff --git a/nuttx/tools/cfgdefine.c b/nuttx/tools/cfgdefine.c
index ee1dd4003..f026a186f 100644
--- a/nuttx/tools/cfgdefine.c
+++ b/nuttx/tools/cfgdefine.c
@@ -64,6 +64,7 @@ static const char *dequote_list[] =
   /* NuttX */
 
   "CONFIG_USER_ENTRYPOINT",            /* Name of entry point function */
+  "CONFIG_EXECFUNCS_SYMTAB",           /* Symbol table used by exec[l|v] */
 
   /* NxWidgets/NxWM */