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bsp/tms570: ensure that linker symbol comparison to NULL is not optimized out.

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Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
This commit is contained in:
Pavel Pisa
2015-11-28 12:01:36 +01:00
committed by Gedare Bloom
parent 7828f1c3aa
commit 2a9db262a2
1 changed files with 12 additions and 2 deletions
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14
c/src/lib/libbsp/arm/tms570/startup/bspstart.c
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@@ -32,6 +32,9 @@
void bsp_start( void )
{
void *need_remap_ptr;
unsigned int need_remap_int;
#if BYTE_ORDER == BIG_ENDIAN
/*
* If CPU is big endian (TMS570 family variant)
@@ -65,9 +68,16 @@ void bsp_start( void )
* SRAM then it leads to CPU error halt.
*
* So use of POM to replace jumps to vectors target
* addresses seems to be the best option.
* addresses seems to be the best option for now.
*
* The passing of linker symbol (represented as start address
* of global array) through dummy asm block ensures that C compiler
* cannot optimize comparison out on premise that reference cannot
* evaluate to NULL definition in standard.
*/
if ( (uintptr_t)bsp_start_vector_table_begin != 0 ) {
need_remap_ptr = bsp_start_vector_table_begin;
asm volatile ("\n": "=r" (need_remap_int): "0" (need_remap_ptr));
if ( need_remap_int != 0 ) {
tms570_pom_remap();
}