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37dff84dbb
Reference code drop-in to firmware should make our implementations of Memset() and SafeMemcmp() get used now. BUG=chrome-os-partner:820 TEST=make && make runtests Change-Id: If0c06dfad85b67398a118985cdb751d20b2b65a4 Review URL: http://codereview.chromium.org/3173035
80 lines
2.5 KiB
C
80 lines
2.5 KiB
C
/* Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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/* Helper functions/wrappers for memory allocations, manipulation and
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* comparison.
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*/
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#ifndef VBOOT_REFERENCE_UTILITY_H_
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#define VBOOT_REFERENCE_UTILITY_H_
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#include "sysincludes.h"
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/* Debug and error output */
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#ifdef VBOOT_DEBUG
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#define VBDEBUG(params) debug params
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#else
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#define VBDEBUG(params)
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#endif
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/* Outputs an error message and quits. */
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void error(const char *format, ...);
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/* Outputs debug/warning messages. */
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void debug(const char *format, ...);
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#define assert(expr) do { if (!(expr)) { \
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error("assert fail: %s at %s:%d\n", \
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#expr, __FILE__, __LINE__); }} while(0)
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/* Combine [msw] and [lsw] uint16s to a uint32_t with its [msw] and
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* [lsw] forming the most and least signficant 16-bit words.
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*/
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#define CombineUint16Pair(msw,lsw) (((msw) << 16) | \
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(((lsw)) & 0xFFFF))
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/* Return the minimum of (a) or (b). */
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#define Min(a, b) (((a) < (b)) ? (a) : (b))
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/* Allocate [size] bytes and return a pointer to the allocated memory. Abort
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* on error.
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*/
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void* Malloc(size_t size);
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/* Free memory pointed by [ptr] previously allocated by Malloc(). */
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void Free(void* ptr);
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/* Compare [n] bytes in [src1] and [src2]
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* Returns an integer less than, equal to, or greater than zero if the first [n]
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* bytes of [src1] is found, respectively, to be less than, to match, or be
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* greater than the first n bytes of [src2]. */
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int Memcmp(const void* src1, const void* src2, size_t n);
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/* Copy [n] bytes from [src] to [dest]. */
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void* Memcpy(void* dest, const void* src, uint64_t n);
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/* Implementations of the functions below must be built as part of the firmware
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* and defined in lib/utility.c */
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/* Set [n] bytes starting at [s] to [c]. */
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void* Memset(void *dest, const uint8_t c, uint64_t n);
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/* Compare [n] bytes starting at [s1] with [s2] and return 0 if they match,
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* 1 if they don't. Time taken to perform the comparison is only dependent on
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* [n] and not on the relationship of the match between [s1] and [s2].
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*/
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int SafeMemcmp(const void* s1, const void* s2, size_t n);
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/* Ensure that only our stub implementations are used, not standard C */
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#ifndef _STUB_IMPLEMENTATION_
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#define malloc _do_not_use_standard_malloc
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#define free _do_not_use_standard_free
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#define memcmp _do_not_use_standard_memcmp
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#define memcpy _do_not_use_standard_memcpy
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#define memset _do_not_use_standard_memset
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#endif
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#endif /* VBOOT_REFERENCE_UTILITY_H_ */
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