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| author | Kartik Agaram <vc@akkartik.com> | 2021-01-11 23:24:35 -0800 |
|---|---|---|
| committer | Kartik Agaram <vc@akkartik.com> | 2021-01-11 23:24:35 -0800 |
| commit | b7e736b5089619e60049c3266aff96581a54a8ab (patch) | |
| tree | 0ff9b3675b7d8b9c253355c7e2b527d141ffb6a1 /baremetal | |
| parent | f6075374f595db87651d62d414b5185d66120ab4 (diff) | |
| download | mu-b7e736b5089619e60049c3266aff96581a54a8ab.tar.gz | |
7497
Diffstat (limited to 'baremetal')
| -rw-r--r-- | baremetal/107trace.subx | 87 | ||||
| -rw-r--r-- | baremetal/108write.subx | 82 |
2 files changed, 82 insertions, 87 deletions
diff --git a/baremetal/107trace.subx b/baremetal/107trace.subx deleted file mode 100644 index cdbdffc5..00000000 --- a/baremetal/107trace.subx +++ /dev/null @@ -1,87 +0,0 @@ -# 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 - -# 3-argument variant of _append -_append-3: # out: (addr byte), outend: (addr byte), s: (addr array byte) -> num_bytes_appended/eax - # . prologue - 55/push-ebp - 89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp - # . save registers - 51/push-ecx - # eax = _append-4(out, outend, &s->data[0], &s->data[s->size]) - # . . push &s->data[s->size] - 8b/copy 1/mod/*+disp8 5/rm32/ebp . . 0/r32/eax 0x10/disp8 . # copy *(ebp+16) to eax - 8b/copy 0/mod/indirect 0/rm32/eax . . . 1/r32/ecx . . # copy *eax to ecx - 8d/copy-address 1/mod/*+disp8 4/rm32/sib 0/base/eax 1/index/ecx . 1/r32/ecx 4/disp8 . # copy eax+ecx+4 to ecx - 51/push-ecx - # . . push &s->data[0] - 8d/copy-address 1/mod/*+disp8 0/rm32/eax . . . 1/r32/ecx 4/disp8 . # copy eax+4 to ecx - 51/push-ecx - # . . push outend - ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 0xc/disp8 . # push *(ebp+12) - # . . push out - ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 8/disp8 . # push *(ebp+8) - # . . call - e8/call _append-4/disp32 - # . . discard args - 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0x10/imm32 # add to esp -$_append-3:end: - # . restore registers - 59/pop-to-ecx - # . epilogue - 89/copy 3/mod/direct 4/rm32/esp . . . 5/r32/ebp . . # copy ebp to esp - 5d/pop-to-ebp - c3/return - -# 4-argument variant of _append -_append-4: # out: (addr byte), outend: (addr byte), in: (addr byte), inend: (addr byte) -> num_bytes_appended/eax: int - # . prologue - 55/push-ebp - 89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp - # . save registers - 51/push-ecx - 52/push-edx - 53/push-ebx - 56/push-esi - 57/push-edi - # num_bytes_appended = 0 - b8/copy-to-eax 0/imm32 - # edi = out - 8b/copy 1/mod/*+disp8 5/rm32/ebp . . . 7/r32/edi 8/disp8 . # copy *(ebp+8) to edi - # edx = outend - 8b/copy 1/mod/*+disp8 5/rm32/ebp . . . 2/r32/edx 0xc/disp8 . # copy *(ebp+12) to edx - # esi = in - 8b/copy 1/mod/*+disp8 5/rm32/ebp . . . 6/r32/esi 0x10/disp8 . # copy *(ebp+16) to esi - # ecx = inend - 8b/copy 1/mod/*+disp8 5/rm32/ebp . . . 1/r32/ecx 0x14/disp8 . # copy *(ebp+20) to ecx -$_append-4:loop: - # if (in >= inend) break - 39/compare 3/mod/direct 6/rm32/esi . . . 1/r32/ecx . . # compare esi with ecx - 73/jump-if-addr>= $_append-4:end/disp8 - # if (out >= outend) abort # just to catch test failures fast - 39/compare 3/mod/direct 7/rm32/edi . . . 2/r32/edx . . # compare edi with edx - 73/jump-if-addr>= $_append-4:end/disp8 # TODO: abort - # *out = *in - 8a/copy-byte 0/mod/indirect 6/rm32/esi . . . 3/r32/BL . . # copy byte at *esi to BL - 88/copy-byte 0/mod/indirect 7/rm32/edi . . . 3/r32/BL . . # copy byte at BL to *edi - # ++num_bytes_appended - 40/increment-eax - # ++in - 46/increment-esi - # ++out - 47/increment-edi - eb/jump $_append-4:loop/disp8 -$_append-4:end: - # . restore registers - 5f/pop-to-edi - 5e/pop-to-esi - 5b/pop-to-ebx - 5a/pop-to-edx - 59/pop-to-ecx - # . 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 diff --git a/baremetal/108write.subx b/baremetal/108write.subx index daf1f535..e97cbc1f 100644 --- a/baremetal/108write.subx +++ b/baremetal/108write.subx @@ -50,4 +50,86 @@ $write:end: # TODO: bring in tests once we have check-ints-equal +# 3-argument variant of _append +_append-3: # out: (addr byte), outend: (addr byte), s: (addr array byte) -> num_bytes_appended/eax + # . prologue + 55/push-ebp + 89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp + # . save registers + 51/push-ecx + # eax = _append-4(out, outend, &s->data[0], &s->data[s->size]) + # . . push &s->data[s->size] + 8b/copy 1/mod/*+disp8 5/rm32/ebp . . 0/r32/eax 0x10/disp8 . # copy *(ebp+16) to eax + 8b/copy 0/mod/indirect 0/rm32/eax . . . 1/r32/ecx . . # copy *eax to ecx + 8d/copy-address 1/mod/*+disp8 4/rm32/sib 0/base/eax 1/index/ecx . 1/r32/ecx 4/disp8 . # copy eax+ecx+4 to ecx + 51/push-ecx + # . . push &s->data[0] + 8d/copy-address 1/mod/*+disp8 0/rm32/eax . . . 1/r32/ecx 4/disp8 . # copy eax+4 to ecx + 51/push-ecx + # . . push outend + ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 0xc/disp8 . # push *(ebp+12) + # . . push out + ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 8/disp8 . # push *(ebp+8) + # . . call + e8/call _append-4/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0x10/imm32 # add to esp +$_append-3:end: + # . restore registers + 59/pop-to-ecx + # . epilogue + 89/copy 3/mod/direct 4/rm32/esp . . . 5/r32/ebp . . # copy ebp to esp + 5d/pop-to-ebp + c3/return + +# 4-argument variant of _append +_append-4: # out: (addr byte), outend: (addr byte), in: (addr byte), inend: (addr byte) -> num_bytes_appended/eax: int + # . prologue + 55/push-ebp + 89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp + # . save registers + 51/push-ecx + 52/push-edx + 53/push-ebx + 56/push-esi + 57/push-edi + # num_bytes_appended = 0 + b8/copy-to-eax 0/imm32 + # edi = out + 8b/copy 1/mod/*+disp8 5/rm32/ebp . . . 7/r32/edi 8/disp8 . # copy *(ebp+8) to edi + # edx = outend + 8b/copy 1/mod/*+disp8 5/rm32/ebp . . . 2/r32/edx 0xc/disp8 . # copy *(ebp+12) to edx + # esi = in + 8b/copy 1/mod/*+disp8 5/rm32/ebp . . . 6/r32/esi 0x10/disp8 . # copy *(ebp+16) to esi + # ecx = inend + 8b/copy 1/mod/*+disp8 5/rm32/ebp . . . 1/r32/ecx 0x14/disp8 . # copy *(ebp+20) to ecx +$_append-4:loop: + # if (in >= inend) break + 39/compare 3/mod/direct 6/rm32/esi . . . 1/r32/ecx . . # compare esi with ecx + 73/jump-if-addr>= $_append-4:end/disp8 + # if (out >= outend) abort # just to catch test failures fast + 39/compare 3/mod/direct 7/rm32/edi . . . 2/r32/edx . . # compare edi with edx + 73/jump-if-addr>= $_append-4:end/disp8 # TODO: abort + # *out = *in + 8a/copy-byte 0/mod/indirect 6/rm32/esi . . . 3/r32/BL . . # copy byte at *esi to BL + 88/copy-byte 0/mod/indirect 7/rm32/edi . . . 3/r32/BL . . # copy byte at BL to *edi + # ++num_bytes_appended + 40/increment-eax + # ++in + 46/increment-esi + # ++out + 47/increment-edi + eb/jump $_append-4:loop/disp8 +$_append-4:end: + # . restore registers + 5f/pop-to-edi + 5e/pop-to-esi + 5b/pop-to-ebx + 5a/pop-to-edx + 59/pop-to-ecx + # . 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 |