diff options
| -rw-r--r-- | targets/avr.S | 17 | ||||
| -rw-r--r-- | targets/avr.ld | 4 |
2 files changed, 21 insertions, 0 deletions
diff --git a/targets/avr.S b/targets/avr.S index 838fd7841..b62c1add6 100644 --- a/targets/avr.S +++ b/targets/avr.S @@ -17,6 +17,23 @@ reset: out 0x3d, xl; SPL out 0x3e, xh; SPH + ; Initialize .data +init_data: + ldi xl, lo8(_sdata) + ldi xh, hi8(_sdata) + ldi yl, lo8(_edata) + ldi yh, hi8(_edata) + ldi zl, lo8(_sidata) + ldi zh, hi8(_sidata) +init_data_loop: + cp xl, yl ; if x == y + cpc xh, yh + breq init_data_end ; goto main + lpm r0, Z+ ; r0 = *(z++) + st X+, r0 ; *(x++) = r0 + rjmp init_data_loop ; goto init_data_loop +init_data_end: + ; main will be placed right after here by the linker script so there's no ; need to jump. diff --git a/targets/avr.ld b/targets/avr.ld index a26e00031..bd23d2744 100644 --- a/targets/avr.ld +++ b/targets/avr.ld @@ -25,10 +25,14 @@ SECTIONS _stack_top = .; } >RAM + _sidata = LOADADDR(.data); + .data : { + _sdata = .; *(.data) *(.data*) + _edata = .; } >RAM AT>FLASH_TEXT .bss : |