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Initial implementatino of sbrk()

This commit is contained in:
Gregory Nutt 2014-09-01 07:37:54 -06:00
parent f8d20db23e
commit 91bffa9cb1
7 changed files with 397 additions and 3 deletions
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22
nuttx/include/nuttx/arch.h
View File

@ -671,6 +671,28 @@ void up_allocate_kheap(FAR void **heap_start, size_t *heap_size);
void up_allocate_pgheap(FAR void **heap_start, size_t *heap_size);
#endif
/****************************************************************************
* Name: pgalloc
*
* Description:
* If there is a page allocator in the configuration and if and MMU is
* available to map physcal addresses to virtual address, then function
* must be provided by the platform-specific code. This is part of the
* implementation of sbrk(). This function will allocate the requested
* number of pages using the page allocator and map them into consecuive
* virtual addresses beginning with 'brkaddr'
*
* NOTE: This function does not use the up_ naming standard because it
* is indirectly callable from user-space code via a system trap.
* Therefore, it is a system interface and follows a different naming
* convention.
*
****************************************************************************/
#if defined(CONFIG_MM_PGALLOC) && defined(CONFIG_ARCH_USE_MMU)
int pgalloc(uintptr_t vaddr, unsigned int npages);
#endif
/****************************************************************************
* Name: up_setpicbase, up_getpicbase
*

15
nuttx/include/nuttx/mm.h
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@ -392,7 +392,20 @@ FAR void *umm_brkaddr(int region);
/* Functions contained in kmm_brkaddr.c *************************************/
#ifdef CONFIG_MM_KERNEL_HEAP
FAR void *umm_brkaddr(int region);
FAR void *kmm_brkaddr(int region);
#endif
/* Functions contained in mm_sbrk.c *****************************************/
#if defined(CONFIG_MM_PGALLOC) && defined(CONFIG_ARCH_USE_MMU)
FAR void *mm_sbrk(FAR struct mm_heap_s *heap, intptr_t incr,
uintptr_t maxbreak);
#endif
/* Functions contained in kmm_sbrk.c ****************************************/
#if defined(CONFIG_MM_PGALLOC) && defined(CONFIG_ARCH_USE_MMU)
FAR void *kmm_sbrk(intptr_t incr);
#endif
/* Functions contained in mm_extend.c ***************************************/

11
nuttx/include/unistd.h
View File

@ -1,7 +1,7 @@
/****************************************************************************
* include/unistd.h
*
* Copyright (C) 2007-2009, 2013 Gregory Nutt. All rights reserved.
* Copyright (C) 2007-2009, 2013-2014 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
@ -103,7 +103,8 @@
#undef EXTERN
#if defined(__cplusplus)
#define EXTERN extern "C"
extern "C" {
extern "C"
{
#else
#define EXTERN extern
#endif
@ -146,6 +147,12 @@ off_t lseek(int fd, off_t offset, int whence);
ssize_t read(int fd, FAR void *buf, size_t nbytes);
ssize_t write(int fd, FAR const void *buf, size_t nbytes);
/* Memory management */
#if defined(CONFIG_MM_PGALLOC) && defined(CONFIG_ARCH_USE_MMU)
FAR void *sbrk(intptr_t incr);
#endif
/* Special devices */
int pipe(int fd[2]);

19
nuttx/mm/Makefile
View File

@ -56,18 +56,37 @@ CSRCS += mm_shrinkchunk.c
CSRCS += mm_brkaddr.c mm_calloc.c mm_extend.c mm_free.c mm_mallinfo.c
CSRCS += mm_malloc.c mm_memalign.c mm_realloc.c mm_zalloc.c
ifeq ($(CONFIG_MM_PGALLOC),y)
ifeq ($(CONFIG_ARCH_USE_MMU),y)
CSRCS += mm_sbrk.c
endif
endif
# User allocator
CSRCS += umm_initialize.c umm_addregion.c umm_sem.c
CSRCS += umm_brkaddr.c umm_calloc.c umm_extend.c umm_free.c umm_mallinfo.c
CSRCS += umm_malloc.c umm_memalign.c umm_realloc.c umm_zalloc.c
ifeq ($(CONFIG_MM_PGALLOC),y)
ifeq ($(CONFIG_ARCH_USE_MMU),y)
CSRCS += umm_sbrk.c
endif
endif
# Kernel allocator
ifeq ($(CONFIG_MM_KERNEL_HEAP),y)
CSRCS += kmm_initialize.c kmm_addregion.c kmm_sem.c
CSRCS += kmm_brkaddr.c kmm_calloc.c kmm_extend.c kmm_free.c kmm_mallinfo.c
CSRCS += kmm_malloc.c kmm_memalign.c kmm_realloc.c kmm_zalloc.c
ifeq ($(CONFIG_MM_PGALLOC),y)
ifeq ($(CONFIG_ARCH_USE_MMU),y)
CSRCS += kmm_sbrk.c
endif
endif
ifeq ($(CONFIG_DEBUG),y)
CSRCS += kmm_heapmember.c
endif

92
nuttx/mm/kmm_sbrk.c Executable file
View File

@ -0,0 +1,92 @@
/****************************************************************************
* mm/kmm_sbrk.c
*
* Copyright (C) 2014 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 <nuttx/mm.h>
#if defined(CONFIG_MM_KERNEL_HEAP) && defined(CONFIG_MM_PGALLOC) && \
defined(CONFIG_ARCH_USE_MMU)
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: kmm_sbrk
*
* Description:
* The sbrk() function is used to change the amount of space allocated
* for the calling process. The change is made by resetting the process'
* break value and allocating the appropriate amount of space. The amount
* of allocated space increases as the break value increases.
*
* The sbrk() function adds 'incr' bytes to the break value and changes
* the allocated space accordingly. If incr is negative, the amount of
* allocated space is decreased by incr bytes. The current value of the
* program break is returned by sbrk(0).
*
* Input Parameters:
* incr - Specifies the number of bytes to add or to remove from the
* space allocated for the process.
*
* Returned Value:
* Upon successful completion, sbrk() returns the prior break value.
* Otherwise, it returns (void *)-1 and sets errno to indicate the
* error:
*
* ENOMEM - The requested change would allocate more space than
* allowed under system limits.
* EAGAIN - The total amount of system memory available for allocation
* to this process is temporarily insufficient. This may occur even
* though the space requested was less than the maximum data segment
* size.
*
****************************************************************************/
FAR void *kmm_sbrk(intptr_t incr)
{
return mm_sbrk(&g_kmmheap, incr, UINTPTR_MAX);
}
#endif /* CONFIG_MM_USER_HEAP && CONFIG_MM_PGALLOC && CONFIG_ARCH_USE_MMU */

146
nuttx/mm/mm_sbrk.c Normal file
View File

@ -0,0 +1,146 @@
/****************************************************************************
* mm/mm_sbrk.c
*
* Copyright (C) 2014 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 <stdint.h>
#include <assert.h>
#include <errno.h>
#include <nuttx/arch.h>
#include <nuttx/mm.h>
#include <nuttx/pgalloc.h>
#if defined(CONFIG_MM_PGALLOC) && defined(CONFIG_ARCH_USE_MMU)
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: mm_sbrk
*
* Description:
* The sbrk() function is used to change the amount of space allocated
* for the calling process. The change is made by resetting the process'
* break value and allocating the appropriate amount of space. The amount
* of allocated space increases as the break value increases.
*
* The sbrk() function adds 'incr' bytes to the break value and changes
* the allocated space accordingly. If incr is negative, the amount of
* allocated space is decreased by incr bytes. The current value of the
* program break is returned by sbrk(0).
*
* Input Parameters:
* incr - Specifies the number of bytes to add or to remove from the
* space allocated for the process.
*
* Returned Value:
* Upon successful completion, sbrk() returns the prior break value.
* Otherwise, it returns (void *)-1 and sets errno to indicate the
* error:
*
* ENOMEM - The requested change would allocate more space than
* allowed under system limits.
* EAGAIN - The total amount of system memory available for allocation
* to this process is temporarily insufficient. This may occur even
* though the space requested was less than the maximum data segment
* size.
*
****************************************************************************/
FAR void *mm_sbrk(FAR struct mm_heap_s *heap, intptr_t incr,
uintptr_t maxbreak)
{
uintptr_t brkaddr;
unsigned int pgincr;
int err;
int ret;
DEBUGASSERT(incr >= 0);
if (incr < 0)
{
err = ENOSYS;
goto errout;
}
/* Get the current break address (NOTE: assumes region 0) */
brkaddr = (uintptr_t)mm_brkaddr(heap, 0);
if (incr > 0)
{
/* Convert the increment to multiples of the page size */
pgincr = MM_NPAGES(incr);
/* Check if this increment would exceed the maximum break value */
if ((maxbreak - brkaddr) < (pgincr << MM_PGSHIFT))
{
err = ENOMEM;
goto errout;
}
/* Allocate the requested number of pages and map them to the
* break address.
*/
ret = pgalloc(brkaddr, pgincr);
if (ret < 0)
{
err = -ret;
goto errout;
}
/* Extend the heap (region 0) */
mm_extend(heap, (FAR void *)brkaddr, pgincr << MM_PGSHIFT, 0);
}
return (FAR void *)brkaddr;
errout:
set_errno(err);
return (FAR void *)-1;
}
#endif /* CONFIG_MM_PGALLOC && CONFIG_ARCH_USE_MMU */

95
nuttx/mm/umm_sbrk.c Normal file
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@ -0,0 +1,95 @@
/****************************************************************************
* mm/umm_sbrk.c
*
* Copyright (C) 2014 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 <unistd.h>
#include <nuttx/mm.h>
#include <nuttx/pgalloc.h>
#if defined(CONFIG_MM_USER_HEAP) && defined(CONFIG_MM_PGALLOC) && \
defined(CONFIG_ARCH_USE_MMU)
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: sbrk
*
* Description:
* The sbrk() function is used to change the amount of space allocated
* for the calling process. The change is made by resetting the process'
* break value and allocating the appropriate amount of space. The amount
* of allocated space increases as the break value increases.
*
* The sbrk() function adds 'incr' bytes to the break value and changes
* the allocated space accordingly. If incr is negative, the amount of
* allocated space is decreased by incr bytes. The current value of the
* program break is returned by sbrk(0).
*
* Input Parameters:
* incr - Specifies the number of bytes to add or to remove from the
* space allocated for the process.
*
* Returned Value:
* Upon successful completion, sbrk() returns the prior break value.
* Otherwise, it returns (void *)-1 and sets errno to indicate the
* error:
*
* ENOMEM - The requested change would allocate more space than
* allowed under system limits.
* EAGAIN - The total amount of system memory available for allocation
* to this process is temporarily insufficient. This may occur even
* though the space requested was less than the maximum data segment
* size.
*
****************************************************************************/
FAR void *sbrk(intptr_t incr)
{
return mm_sbrk(&g_mmheap, incr, CONFIG_ARCH_STACK_NPAGES << MM_PGSHIFT);
}
#endif /* CONFIG_MM_USER_HEAP && CONFIG_MM_PGALLOC && CONFIG_ARCH_USE_MMU */