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2016-03-08malloc: use hidden visibilityStephen Warren
When running sandbox, the following phases occur, each with different malloc implementations or behaviors: 1) Dynamic linker execution, using the dynamic linker's own malloc() implementation. This is fully functional. 2) After U-Boot's malloc symbol has been hooked into the GOT, but before any U-Boot code has run. This phase is entirely non-functional, since U-Boot's gd symbol is NULL and U-Boot's initf_malloc() and mem_malloc_init() have not been called. At least on Ubuntu Xenial, the dynamic linker does make both malloc() and free() calls during this phase. Currently these free() calls crash since they dereference gd, which is NULL. U-Boot itself makes no use of malloc() during this phase. 3) U-Boot execution after gd is set and initf_malloc() has been called. This is fully functional, albeit via a very simple malloc() implementation. 4) U-Boot execution after mem_malloc_init() has been called. This is fully functional with a complete malloc() implementation. Furthermore, if code that called malloc() during phase 1 calls free() in phase 3 or later, it is likely that heap corruption will occur, since U-Boot's malloc implementation will assume the pointer is part of its own heap, although it isn't. I have not actively observed this happening. To prevent phase 2 from happening, this patch makes all of U-Boot's malloc library public symbols have hidden visibility. This prevents them from being hooked into the GOT, so only code in the U-Boot binary itself actually calls them; any other code will call into the standard C library malloc(). This also avoids the "furthermore" issue mentioned above. I have seen references to this GCC pragma in blog posts from 2008, and RHEL5's ancient gcc appears to accept it fine, so I believe it's quite safe to use it without checking gcc version. Cc: Rabin Vincent <rabin@rab.in> Signed-off-by: Stephen Warren <swarren@wwwdotorg.org> Reviewed-by: Tom Rini <trini@konsulko.com> Reviewed-by: Simon Glass <sjg@chromium.org>
2015-10-20malloc_simple: Add Kconfig option for using only malloc_simple in the SPLHans de Goede
common/dlmalloc.c is quite big, both in .text and .data usage, therefor on some boards the SPL is build to use only malloc_simple.c and not the dlmalloc.c code. This is done in various include/configs/foo.h with the following construct: #ifdef CONFIG_SPL_BUILD #define CONFIG_SYS_MALLOC_SIMPLE #endif This commit introduces a SPL_MALLOC_SIMPLE Kconfig bool which allows selecting this functionality through Kconfig instead. Signed-off-by: Hans de Goede <hdegoede@redhat.com> Acked-by: Simon Glass <sjg@chromium.org>
2015-04-23Move initf_malloc() to a common placeSimon Glass
To allow this function to be used from SPL, move it to the malloc() code. Signed-off-by: Simon Glass <sjg@chromium.org>
2014-11-21dm: Split the simple malloc() implementation into its own fileSimon Glass
The simple malloc() implementation is used when memory is tight. It provides a simple buffer with an incrementing pointer. At present the implementation is inside dlmalloc. Move it into its own file so that it is easier to find. Rather than using relocation as a signal that the full malloc() is available, add a special GD_FLG_FULL_MALLOC_INIT flag. This signals that the simple malloc() should no longer be used. In some cases, such as SPL, even the code space used by the full malloc() is wasteful. Add a CONFIG_SYS_MALLOC_SIMPLE option to provide only the simple malloc. In this case the full malloc is not available at all. It saves about 1KB of code space and about 0.5KB of data on Thumb 2. Acked-by: Tom Rini <trini@ti.com> Signed-off-by: Simon Glass <sjg@chromium.org>
2013-04-01Consolidate bool typeYork Sun
'bool' is defined in random places. This patch consolidates them into a single header file include/linux/types.h, using stdbool.h introduced in C99. All other #define, typedef and enum are removed. They are all consistent with true = 1, false = 0. Replace FALSE, False with false. Replace TRUE, True with true. Skip *.py, *.php, lib/* files. Signed-off-by: York Sun <yorksun@freescale.com>
2013-02-19malloc: make malloc_bin_reloc staticGabor Juhos
On architectures where manual relocation is needed, the 'malloc_bin_reloc' function must be called after 'mem_malloc_init'. Make the 'malloc_bin_reloc' function static and call it directly from 'mem_malloc_init' instead of calling that from board_init_{r,f} functions of the affected architectures. Signed-off-by: Gabor Juhos <juhosg@openwrt.org> Cc: Wolfgang Denk <wd@denx.de> Cc: Andreas Bießmann <andreas.devel@gmail.com> Cc: Jason Jin <Jason.jin@freescale.com> Cc: Macpaul Lin <macpaul@andestech.com> Cc: Daniel Hellstrom <daniel@gaisler.com> Cc: Daniel Schwierzeck <daniel.schwierzeck@googlemail.com>
2012-09-26malloc: remove extern declarations of malloc_bin_reloc() in board.c filesDaniel Schwierzeck
Declare malloc_bin_reloc() in malloc.h and remove all extern declarations in various board.c files to get rid of one checkpatch.pl warning. Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@googlemail.com> Cc: Wolfgang Denk <wd@denx.de> Cc: Andreas Bießmann <andreas.devel@gmail.com> Cc: Jason Jin <Jason.jin@freescale.com> Cc: Macpaul Lin <macpaul@andestech.com> Cc: Daniel Hellstrom <daniel@gaisler.com> Acked-by: Andreas Bießmann <andreas.devel@gmail.com>
2012-08-09Malloc: Fix -Wundef warningsMarek Vasut
In file included from arch/arm/lib/board.c:43:0: include/malloc.h:490:5: warning: "HAVE_MMAP" is not defined [-Wundef] include/malloc.h:590:5: warning: "HAVE_USR_INCLUDE_MALLOC_H" is not defined [-Wundef] include/malloc.h:757:5: warning: "HAVE_MMAP" is not defined [-Wundef] Signed-off-by: Marek Vasut <marek.vasut@gmail.com> Cc: Wolfgang Denk <wd@denx.de>
2011-09-09Add assert() for debug assertionsSimon Glass
assert() is like BUG_ON() but compiles to nothing unless DEBUG is defined. This is useful when a condition is an error but a board reset is unlikely to fix it, so it is better to soldier on in hope. Assertion failures should be caught during development/test. It turns out that assert() is defined separately in a few places in U-Boot with various meanings. This patch cleans up some of these. Build errors exposed by this change (and defining DEBUG) are also fixed in this patch. Signed-off-by: Simon Glass <sjg@chromium.org>
2009-09-04Consolidate arch-specific mem_malloc_init() implementationsPeter Tyser
Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
2009-09-04Consolidate arch-specific sbrk() implementationsPeter Tyser
Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
2009-07-19malloc.h: protect it against multiple includeJean-Christophe PLAGNIOL-VILLARD
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
2003-06-27* Code cleanup:wdenk
- remove trailing white space, trailing empty lines, C++ comments, etc. - split cmd_boot.c (separate cmd_bdinfo.c and cmd_load.c) * Patches by Kenneth Johansson, 25 Jun 2003: - major rework of command structure (work done mostly by Michal Cendrowski and Joakim Kristiansen)
2002-11-03Initial revisionwdenk