diff options
| author | Jan Tuomi <jans.tuomi@gmail.com> | 2023-04-13 14:48:34 +0300 |
|---|---|---|
| committer | Jan Tuomi <jans.tuomi@gmail.com> | 2023-04-13 14:49:59 +0300 |
| commit | 9d4c6fc299294ac36f7082599edce19286fa0f99 (patch) | |
| tree | e7601bb1cd9950482f125377d25b6d5d40b72e62 /asm | |
| parent | afd5f32e56d3d30bfa98fb35deff51febf50e594 (diff) | |
Add @let directive, start pondering interrupt control
Diffstat (limited to 'asm')
| -rw-r--r-- | asm/bootstrap.atk16 | 23 | ||||
| -rw-r--r-- | asm/ext_std.py | 4 | ||||
| -rw-r--r-- | asm/fibo.atk16 | 14 | ||||
| -rw-r--r-- | asm/ram_offset.atk16 | 2 |
4 files changed, 31 insertions, 12 deletions
diff --git a/asm/bootstrap.atk16 b/asm/bootstrap.atk16 new file mode 100644 index 0000000..c7ab63e --- /dev/null +++ b/asm/bootstrap.atk16 @@ -0,0 +1,23 @@ +@let stack_segment 0x8000 +@let vector_table 0x10 + +@address vector_table + hlt_isr ; 0x10 ISR0 + hlt_isr ; 0x11 ISR1 + hlt_isr ; 0x12 ISR2 + hlt_isr ; 0x13 ISR3 + stack_segment ; 0x14 Stack address + +@label hlt_isr + ldi 0x55 RA + hlt +@label program_segment + +@address 0x0 +; set up stack pointer to point to beginning of stack segment + ldi 0x14 RA + ldr RA RF + jpi main + +@address program_segment +; set up address for program code diff --git a/asm/ext_std.py b/asm/ext_std.py index 11da8aa..de7cd43 100644 --- a/asm/ext_std.py +++ b/asm/ext_std.py @@ -48,6 +48,9 @@ def expand_dec(reg: str) -> ExpandResult: def expand_mov(from_reg: str, to_reg: str) -> ExpandResult: return [["ali", "al_plus", from_reg, "0", to_reg]] +def expand_nop() -> ExpandResult: + return [["ali", "al_plus", "RA", "0", "RA"]] + def expand_spu(reg: str) -> ExpandResult: return [["str", reg, "__STACK_POINTER"]] + expand_inc("__STACK_POINTER") @@ -89,6 +92,7 @@ expansions: OpExpansionDict = { "inc": expand_inc, "dec": expand_dec, "mov": expand_mov, + "nop": expand_nop, "spu": expand_spu, "spo": expand_spo, "csr": expand_csr, diff --git a/asm/fibo.atk16 b/asm/fibo.atk16 index cae5f5d..fb375b3 100644 --- a/asm/fibo.atk16 +++ b/asm/fibo.atk16 @@ -2,17 +2,11 @@ @opt csr_scratch RH @use ext_std:* -; jump over data segment - jpi program - -; data segment -@include ram_offset - -@label program -; set up stack pointer to point to beginning of RAM - ldi ram_offset_addr RA - ldr RA RF +; bootstrap code (must be called to setup mandatory data) +; will jump to label main +@include bootstrap +@label main ; call fibo subroutine with parameter 10 ldi 10 RA csi fibo diff --git a/asm/ram_offset.atk16 b/asm/ram_offset.atk16 deleted file mode 100644 index e8c9255..0000000 --- a/asm/ram_offset.atk16 +++ /dev/null @@ -1,2 +0,0 @@ -@label ram_offset_addr - 0x8000 |