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| author | Kartik Agaram <vc@akkartik.com> | 2020-07-05 12:13:28 -0700 |
|---|---|---|
| committer | Kartik Agaram <vc@akkartik.com> | 2020-07-05 12:13:28 -0700 |
| commit | c09c91e185aad8e01b570c2569e13c1e429d2f99 (patch) | |
| tree | 52a5ae1494ad5b7b2319411815dc45510e761c24 /070new-stream.subx | |
| parent | f2c5b05374186f9422cfdaf1ada096e39ac91a8b (diff) | |
| download | mu-c09c91e185aad8e01b570c2569e13c1e429d2f99.tar.gz | |
6612 - reorganize layers
Diffstat (limited to '070new-stream.subx')
| -rw-r--r-- | 070new-stream.subx | 136 |
1 files changed, 0 insertions, 136 deletions
diff --git a/070new-stream.subx b/070new-stream.subx deleted file mode 100644 index e781ecd6..00000000 --- a/070new-stream.subx +++ /dev/null @@ -1,136 +0,0 @@ -# Helper to allocate a stream on the heap. - -== code -# instruction effective address register displacement immediate -# . op subop mod rm32 base index scale r32 -# . 1-3 bytes 3 bits 2 bits 3 bits 3 bits 3 bits 2 bits 2 bits 0/1/2/4 bytes 0/1/2/4 bytes - -new-stream: # ad: (addr allocation-descriptor), length: int, elemsize: int, out: (addr handle stream _) - # . prologue - 55/push-ebp - 89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp - # . save registers - 50/push-eax - 52/push-edx - # var size/edx: int = elemsize*length (clobbering eax) - # . eax = elemsize - 8b/copy 1/mod/*+disp8 5/rm32/ebp . . . 0/r32/eax 0x10/disp8 . # copy *(ebp+16) to eax - # . eax *= length - 31/xor 3/mod/direct 2/rm32/edx . . . 2/r32/edx . . # clear edx - f7 4/subop/multiply 1/mod/*+disp8 5/rm32/ebp . . 0xc/disp8 . # multiply *(ebp+12) into eax - # . if overflow abort - 81 7/subop/compare 3/mod/direct 2/rm32/edx . . . . . 0/imm32 # compare edx - 75/jump-if-!= $new-stream:abort/disp8 - # . edx = elemsize*length - 89/copy 3/mod/direct 2/rm32/edx . . . 0/r32/eax . . # copy eax to edx - # var n/eax: int = size + 12 (for read, write and size) - 05/add-to-eax 0xc/imm32 - # allocate(ad, n, out) - # . . push args - ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 0x14/disp8 . # push *(ebp+20) - 50/push-eax - ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 8/disp8 . # push *(ebp+8) - # . . call - e8/call allocate/disp32 - # . . discard args - 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0xc/imm32 # add to esp - # eax = out->payload - 8b/copy 1/mod/*+disp8 5/rm32/ebp . . . 0/r32/eax 0x14/disp8 . # copy *(ebp+20) to eax - 8b/copy 1/mod/*+disp8 0/rm32/eax . . . 0/r32/eax 4/disp8 . # copy *(eax+4) to eax - # skip payload->allocid - 05/add-to-eax 4/imm32 - # eax->size = size - 89/copy 1/mod/*+disp8 0/rm32/eax . . . 2/r32/edx 8/disp8 . # copy edx to *(eax+8) - # clear-stream(eax) - # . . push args - 50/push-eax - # . . call - e8/call clear-stream/disp32 - # . . discard args - 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp -$new-stream:end: - # . restore registers - 5a/pop-to-edx - 58/pop-to-eax - # . epilogue - 89/copy 3/mod/direct 4/rm32/esp . . . 5/r32/ebp . . # copy ebp to esp - 5d/pop-to-ebp - c3/return - -$new-stream:abort: - # . _write(2/stderr, error) - # . . push args - 68/push "new-stream: size too large\n"/imm32 - 68/push 2/imm32/stderr - # . . call - e8/call _write/disp32 - # . . discard args - 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp - # . syscall(exit, 1) - bb/copy-to-ebx 1/imm32 - e8/call syscall_exit/disp32 - # never gets here - -test-new-stream: - # . prologue - 55/push-ebp - 89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp - # var heap/ecx: allocation-descriptor - 68/push 0/imm32/limit - 68/push 0/imm32/curr - 89/copy 3/mod/direct 1/rm32/ecx . . . 4/r32/esp . . # copy esp to ecx - # heap = new-segment(512) - # . . push args - 51/push-ecx - 68/push 0x200/imm32 - # . . call - e8/call new-segment/disp32 - # . . discard args - 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp - # var start/edx = ad->curr - 8b/copy 0/mod/indirect 1/rm32/ecx . . . 2/r32/edx . . # copy *ecx to edx - # var h/ebx: (handle stream byte) - 68/push 0/imm32 - 68/push 0/imm32 - 89/copy 3/mod/direct 3/rm32/ebx . . . 4/r32/esp . . # copy esp to ebx - # new-stream(heap, 3, 2, h) - # . . push args - 53/push-ebx - 68/push 2/imm32 - 68/push 3/imm32 - 51/push-ecx - # . . call - e8/call new-stream/disp32 - # . . discard args - 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0x10/imm32 # add to esp - # eax = out->payload - 8b/copy 1/mod/*+disp8 3/rm32/ebx . . . 0/r32/eax 4/disp8 . # copy *(ebx+4) to eax - # check-ints-equal(eax, edx, msg) - # . . push args - 68/push "F - test-new-stream: returns current pointer of allocation descriptor"/imm32 - 52/push-edx - 50/push-eax - # . . call - e8/call check-ints-equal/disp32 - # . . discard args - 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0xc/imm32 # add to esp - # skip payload->allocid - 05/add-to-eax 4/imm32 - # check-ints-equal(eax->size, 6, msg) - # . . push args - 68/push "F - test-new-stream: sets size correctly"/imm32 - 68/push 6/imm32 - ff 6/subop/push 1/mod/*+disp8 0/rm32/eax . . . . . 8/disp8 # push *(eax+8) - # . . call - e8/call check-ints-equal/disp32 - # . . discard args - 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0xc/imm32 # add to esp - # the rest is delegated to clear-stream() so we won't bother checking it - # . reclaim locals - 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0x10/imm32 # add to esp - # . epilogue - 89/copy 3/mod/direct 4/rm32/esp . . . 5/r32/ebp . . # copy ebp to esp - 5d/pop-to-ebp - c3/return - -# . . vim:nowrap:textwidth=0 |