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mbedtls: Use `tf_snprintf` instead of `snprintf` 

The Trusted Firmware uses a subset of the APIs provided by mbed TLS.
This subset internally uses `snprintf`, but the only format specifier
used is '%d', which is supported by `tf_snprintf`.

This patch makes mbed TLS use `tf_snprintf` instead of `snprintf`,
saving 3 KB in both debug and release builds when TBBR is enabled.

Change-Id: I7f992a21015930d7c0f4660e7a28ceefd60b9597
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>
This commit is contained in:
Antonio Nino Diaz 2017-05-19 11:37:22 +01:00
parent da5241cb15
commit ab1794f576
2 changed files with 8 additions and 1 deletions
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7
drivers/auth/mbedtls/mbedtls_common.c
View File

@ -4,10 +4,11 @@
* SPDX-License-Identifier: BSD-3-Clause * SPDX-License-Identifier: BSD-3-Clause
*/ */
#include <assert.h> #include <debug.h>
/* mbed TLS headers */ /* mbed TLS headers */
#include <mbedtls/memory_buffer_alloc.h> #include <mbedtls/memory_buffer_alloc.h>
#include <mbedtls/platform.h>
/* /*
* mbed TLS heap * mbed TLS heap
@ -29,6 +30,10 @@ void mbedtls_init(void)
if (!ready) { if (!ready) {
/* Initialize the mbed TLS heap */ /* Initialize the mbed TLS heap */
mbedtls_memory_buffer_alloc_init(heap, MBEDTLS_HEAP_SIZE); mbedtls_memory_buffer_alloc_init(heap, MBEDTLS_HEAP_SIZE);
/* Use reduced version of snprintf to save space. */
mbedtls_platform_set_snprintf(tf_snprintf);
ready = 1; ready = 1;
} }
} }

2
include/drivers/auth/mbedtls/mbedtls_config.h
View File

@ -19,6 +19,8 @@
#define MBEDTLS_PLATFORM_MEMORY #define MBEDTLS_PLATFORM_MEMORY
#define MBEDTLS_PLATFORM_NO_STD_FUNCTIONS #define MBEDTLS_PLATFORM_NO_STD_FUNCTIONS
/* Prevent mbed TLS from using snprintf so that it can use tf_snprintf. */
#define MBEDTLS_PLATFORM_SNPRINTF_ALT
#define MBEDTLS_PKCS1_V15 #define MBEDTLS_PKCS1_V15
#define MBEDTLS_PKCS1_V21 #define MBEDTLS_PKCS1_V21