/* Define a symbol to mark the start of the code region we need to copy.
*/
static void clone_region_start (void)
{
}
...
/* Define a symbol to mark the end of the code region we need to copy.
*/
static void clone_region_end (void)
{
}
/* This is the external interface for the flash driver.
*/
void flash_upgrade (chip_t *chip, unsigned short *pos, int cnt,
unsigned short *contents)
{
unsigned short clone[600]; /* 1200 bytes for RAM-copy */
/* Calculate code length and offsets for functions we need to copy/call
*/
int code_length = ((char *)clone_region_end) - ((char *)clone_region_start);
int flash_offset = ((short *)flash_op) - ((short *)clone_region_start);
int read_id_offset = ((short *)read_id_op) - ((short *)clone_region_start);
These computations assume the symbols in the program image will
be emitted in the same order as those in the source file. That's
not a safe assumption since neither the compiler nor the linker
guarantee any particular order of symbols. IIRC, in my last job,
I saw the same assumption break after switching from gcc 4.2 to
4.5 and binutils 2.18 to 2.21.
Martin
