diff options
Diffstat (limited to 'c/src/lib/libbsp/m68k/ods68302/start/reset.S')
| -rw-r--r-- | c/src/lib/libbsp/m68k/ods68302/start/reset.S | 42 |
1 files changed, 20 insertions, 22 deletions
diff --git a/c/src/lib/libbsp/m68k/ods68302/start/reset.S b/c/src/lib/libbsp/m68k/ods68302/start/reset.S index 1d1aec955f..2bbc900f9e 100644 --- a/c/src/lib/libbsp/m68k/ods68302/start/reset.S +++ b/c/src/lib/libbsp/m68k/ods68302/start/reset.S @@ -37,7 +37,7 @@ | | Initial stack pointer is in the dual ported RAM | - .sect .text + .sect .resettext .global M68Kvec | Vector Table @@ -469,8 +469,9 @@ zerobss_loop: cmpal %a0,%a1 jlt zerobss_loop | loop until _end reached - movel %d0,_stack_init | load stack top - + movel #stack_end,%d0 + andl #0xfffffffc,%d0 | align it on 16 byte boundary + movw #0x3700,%sr | SUPV MODE,INTERRUPTS OFF!!! movel %d0,%a7 | set master stack pointer movel %d0,%a6 | set base pointer @@ -493,7 +494,6 @@ zerobss_loop: unhandled_exception: EXCEPTION_HANDLER(#, 0) -#if 0 EXCEPTION_HANDLER(#, 1) EXCEPTION_HANDLER(#, 2) EXCEPTION_HANDLER(#, 3) @@ -775,13 +775,8 @@ EXCEPTION_HANDLER(#, 253) EXCEPTION_HANDLER(#, 254) EXCEPTION_HANDLER(#, 255) -#endif - - - common_exception_handler: -#if 0 | | Need to put the format/vector above the PC and status register | @@ -801,7 +796,6 @@ common_exception_handler: beq ceh_10 bra ceh_20 - ceh_10: move.w %d0,12(%sp) | need to move the format/id @@ -809,7 +803,7 @@ ceh_10: addq #8,%sp | trash the stack move.l %d0,-(%sp) | free a register, again move.w 4(%sp),%d0 | get the format/vector id - + ceh_20: move.w 6(%sp),4(%sp) @@ -827,23 +821,25 @@ ceh_20: | | check to see if ROM is mapped to zero | - - move.l #trace_exception,%d1 | get the linked address - and.l #(ROM_SIZE - 1),%d1 | obtain the offset into the ROM + + move.l #(ROM_SIZE - 1),%d1 + not.l %d1 lea.l %pc@(0),%a0 | were are we currently move.l %a0,%d0 | need to use a data register - and.l #~(ROM_SIZE - 1),%d0 | keep the top part of the address + and.l %d1,%d0 | keep the top part of the address + move.l #trace_exception,%d1 | get the linked address + and.l #(ROM_SIZE - 1),%d1 | obtain the offset into the ROM or.l %d1,%d0 | apply it to the trace exception offset move.l %d0,%a0 | need an address register for jumping jsr %a0@(0) ceh_30: jmp ceh_30 + | | The RAM based vector table | -#endif .sect .vtable .global vector_table @@ -862,10 +858,6 @@ vector_table: start_frame: .space 4,0 - .global stack_start - -stack_start: - .space 4,0 | | Uninitialised data @@ -884,5 +876,11 @@ environ: .global stack_size .set stack_size,0x1000 - - + .global stack_start + +stack_start: +stack_base: + .space 0x2000, 0 +stack_end: + .long 0 + |