414 lines
19 KiB
Plaintext
414 lines
19 KiB
Plaintext
# A stack looks like this:
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# top: int
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# data: (array byte) # prefixed by length as usual
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== code
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# instruction effective address register displacement immediate
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# . op subop mod rm32 base index scale r32
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# . 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
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clear-stack: # s : (addr stack)
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# . prologue
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55/push-ebp
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89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp
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# . save registers
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50/push-eax
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51/push-ecx
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# eax = s
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8b/copy 1/mod/*+disp8 5/rm32/ebp . . . 0/r32/eax 8/disp8 . # copy *(ebp+8) to eax
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# var max/ecx : (addr byte) = &s->data[s->length]
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8b/copy 1/mod/*+disp8 0/rm32/eax . . . 1/r32/ecx 4/disp8 . # copy *(eax+4) to eax
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8d/copy-address 1/mod/*+disp8 4/rm32/sib 0/base/eax 1/index/ecx . 1/r32/ecx 8/disp8 . # copy eax+ecx+8 to ecx
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# s->top = 0
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c7 0/subop/copy 0/mod/direct 0/rm32/eax . . . . . 0/imm32 # copy to *eax
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# var curr/eax : (addr byte) = s->data
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81 0/subop/add 3/mod/direct 0/rm32/eax . . . . . 8/imm32 # add to eax
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$clear-stack:loop:
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# if (curr >= max) break
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39/compare 3/mod/direct 0/rm32/eax . . . 1/r32/ecx . . # compare eax with ecx
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73/jump-if-greater-or-equal-unsigned $clear-stack:end/disp8
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# *curr = 0
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c6 0/subop/copy 0/mod/direct 0/rm32/eax . . . . . 0/imm8 # copy byte to *eax
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# ++curr
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40/increment-eax
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eb/jump $clear-stack:loop/disp8
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$clear-stack:end:
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# . restore registers
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59/pop-to-ecx
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58/pop-to-eax
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# . epilogue
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89/copy 3/mod/direct 4/rm32/esp . . . 5/r32/ebp . . # copy ebp to esp
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5d/pop-to-ebp
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c3/return
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test-clear-stack:
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# . prologue
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55/push-ebp
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89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp
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# var stack/ecx = stack of size 8 with random data in it
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68/push 34/imm32
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68/push 35/imm32
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68/push 8/imm32/length
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68/push 14/imm32/top
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89/copy 3/mod/direct 1/rm32/ecx . . . 4/r32/esp . . # copy esp to ecx
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# clear(stack)
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# . . push args
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51/push-ecx
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# . . call
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e8/call clear-stack/disp32
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# . . discard args
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81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
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# top should be 0
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58/pop-to-eax
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# . check-ints-equal(eax, 0, msg)
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# . . push args
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68/push "F - test-clear-stack: top"/imm32
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68/push 0/imm32
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50/push-eax
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# . . call
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e8/call check-ints-equal/disp32
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# . . discard args
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81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0xc/imm32 # add to esp
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# length should remain 8
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58/pop-to-eax
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# . check-ints-equal(eax, 8, msg)
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# . . push args
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68/push "F - test-clear-stack: length"/imm32
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68/push 8/imm32
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50/push-eax
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# . . call
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e8/call check-ints-equal/disp32
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# . . discard args
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81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0xc/imm32 # add to esp
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# first word is 0
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58/pop-to-eax
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# . check-ints-equal(eax, 0, msg)
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# . . push args
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68/push "F - test-clear-stack: data[0..3]"/imm32
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68/push 0/imm32
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50/push-eax
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# . . call
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e8/call check-ints-equal/disp32
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# . . discard args
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81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0xc/imm32 # add to esp
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# second word is 0
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58/pop-to-eax
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# . check-ints-equal(eax, 0, msg)
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# . . push args
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68/push "F - test-clear-stack: data[4..7]"/imm32
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68/push 0/imm32
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50/push-eax
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# . . call
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e8/call check-ints-equal/disp32
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# . . discard args
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81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0xc/imm32 # add to esp
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# . epilogue
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89/copy 3/mod/direct 4/rm32/esp . . . 5/r32/ebp . . # copy ebp to esp
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5d/pop-to-ebp
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c3/return
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push: # s : (addr stack), n : int
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# . prologue
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55/push-ebp
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89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp
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# . save registers
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50/push-eax
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51/push-ecx
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56/push-esi
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# esi = s
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8b/copy 1/mod/*+disp8 5/rm32/ebp . . . 6/r32/esi 8/disp8 . # copy *(ebp+8) to esi
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# ecx = s->top
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8b/copy 0/mod/indirect 6/rm32/esi . . . 1/r32/ecx . . # copy *esi to ecx
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# if (s->top >= s->length) abort
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39/compare 1/mod/*+disp8 6/rm32/esi . . . 1/r32/ecx 4/disp8 . # compare *(esi+4) and ecx
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7e/jump-if-lesser-or-equal $push:abort/disp8
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# s->data[s->top] = n
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8b/copy 1/mod/*+disp8 5/rm32/ebp . . . 0/r32/eax 0xc/disp8 . # copy *(ebp+12) to eax
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89/copy 1/mod/*+disp8 4/rm32/sib 6/base/esi 1/index/ecx . 0/r32/eax 8/disp8 . # copy eax to *(esi+ecx+8)
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# s->top += 4
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81 0/subop/add 0/mod/direct 6/rm32/esi . . . . . 4/imm32 # subtract from *esi
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$push:end:
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# . restore registers
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5e/pop-to-esi
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59/pop-to-ecx
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58/pop-to-eax
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# . epilogue
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89/copy 3/mod/direct 4/rm32/esp . . . 5/r32/ebp . . # copy ebp to esp
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5d/pop-to-ebp
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c3/return
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$push:abort:
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# print(stderr, "error: push: no space left")
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# . write-buffered(Stderr, "error: push: no space left")
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# . . push args
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68/push "error: push: no space left"/imm32
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68/push Stderr/imm32
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# . . call
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e8/call write-buffered/disp32
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# . . discard args
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81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
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# . flush(Stderr)
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# . . push args
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68/push Stderr/imm32
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# . . call
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e8/call flush/disp32
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# . . discard args
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81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
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# . syscall(exit, 1)
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bb/copy-to-ebx 1/imm32
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b8/copy-to-eax 1/imm32/exit
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cd/syscall 0x80/imm8
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# never gets here
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test-push:
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# . prologue
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55/push-ebp
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89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp
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# var stack/ecx = empty stack of size 8
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68/push 0/imm32
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68/push 0/imm32
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68/push 8/imm32/length
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68/push 0/imm32/top
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89/copy 3/mod/direct 1/rm32/ecx . . . 4/r32/esp . . # copy esp to ecx
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# push(stack, 0x42)
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# . . push args
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68/push 0x42/imm32
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51/push-ecx
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# . . call
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e8/call push/disp32
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# . . discard args
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81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
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# check top
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58/pop-to-eax
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# . check-ints-equal(eax, 4, msg)
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# . . push args
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68/push "F - test-push: top"/imm32
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68/push 4/imm32
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50/push-eax
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# . . call
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e8/call check-ints-equal/disp32
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# . . discard args
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81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0xc/imm32 # add to esp
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# check length
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58/pop-to-eax
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# . check-ints-equal(eax, 8, msg)
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# . . push args
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68/push "F - test-push: length"/imm32
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68/push 8/imm32
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50/push-eax
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# . . call
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e8/call check-ints-equal/disp32
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# . . discard args
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81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0xc/imm32 # add to esp
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# first word is 0x42
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58/pop-to-eax
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# . check-ints-equal(eax, 0x42, msg)
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# . . push args
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68/push "F - test-push: data[0..3]"/imm32
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68/push 0x42/imm32
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50/push-eax
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# . . call
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e8/call check-ints-equal/disp32
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# . . discard args
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81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0xc/imm32 # add to esp
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# second word is 0
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58/pop-to-eax
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# . check-ints-equal(eax, 0, msg)
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# . . push args
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68/push "F - test-push: data[4..7]"/imm32
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68/push 0/imm32
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50/push-eax
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# . . call
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e8/call check-ints-equal/disp32
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# . . discard args
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81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0xc/imm32 # add to esp
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# . epilogue
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89/copy 3/mod/direct 4/rm32/esp . . . 5/r32/ebp . . # copy ebp to esp
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5d/pop-to-ebp
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c3/return
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pop: # s : (addr stack) -> n/eax : int
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# . prologue
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55/push-ebp
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89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp
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# . save registers
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51/push-ecx
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56/push-esi
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# esi = s
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8b/copy 1/mod/*+disp8 5/rm32/ebp . . . 6/r32/esi 8/disp8 . # copy *(ebp+8) to esi
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# if (s->top <= 0) abort
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81 7/subop/compare 0/mod/indirect 6/rm32/esi . . . . . 0/imm32 # compare *esi
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7e/jump-if-lesser-or-equal $pop:abort/disp8
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# s->top -= 4
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81 5/subop/subtract 0/mod/direct 6/rm32/esi . . . . . 4/imm32 # subtract from *esi
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# eax = s->data[s->top]
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8b/copy 0/mod/indirect 6/rm32/esi . . . 1/r32/ecx . . # copy *esi to ecx
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8b/copy 1/mod/*+disp8 4/rm32/sib 6/base/esi 1/index/ecx . 0/r32/eax 8/disp8 . # copy *(esi+ecx+8) to eax
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# s->data[s->top] = 0
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c7 0/subop/copy 1/mod/*+disp8 4/rm32/sib 6/base/esi 1/index/ecx . 0/r32/eax 8/disp8 0/imm32 # copy to *(esi+ecx+8)
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$pop:end:
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# . restore registers
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5e/pop-to-esi
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59/pop-to-ecx
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# . epilogue
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89/copy 3/mod/direct 4/rm32/esp . . . 5/r32/ebp . . # copy ebp to esp
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5d/pop-to-ebp
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c3/return
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$pop:abort:
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# print(stderr, "error: pop: nothing left in stack")
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# . write-buffered(Stderr, "error: pop: nothing left in stack")
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# . . push args
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68/push "error: pop: nothing left in stack"/imm32
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68/push Stderr/imm32
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# . . call
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e8/call write-buffered/disp32
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# . . discard args
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81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
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# . flush(Stderr)
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# . . push args
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68/push Stderr/imm32
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# . . call
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e8/call flush/disp32
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# . . discard args
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81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
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# . syscall(exit, 1)
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bb/copy-to-ebx 1/imm32
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b8/copy-to-eax 1/imm32/exit
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cd/syscall 0x80/imm8
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# never gets here
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test-pop:
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# . prologue
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55/push-ebp
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89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp
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# var stack/ecx = stack of size 8 containing just 0x42
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68/push 0/imm32
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68/push 0x42/imm32
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68/push 8/imm32/length
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68/push 4/imm32/top
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89/copy 3/mod/direct 1/rm32/ecx . . . 4/r32/esp . . # copy esp to ecx
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# eax = pop(stack)
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# . . push args
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51/push-ecx
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# . . call
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e8/call pop/disp32
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# . . discard args
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81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
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# check-ints-equal(eax, 0x42, msg)
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# . . push args
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68/push "F - test-pop: result"/imm32
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68/push 0x42/imm32
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50/push-eax
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# . . call
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e8/call check-ints-equal/disp32
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# . . discard args
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81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0xc/imm32 # add to esp
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# check top
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58/pop-to-eax
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# . check-ints-equal(eax, 0, msg)
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# . . push args
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68/push "F - test-pop: top"/imm32
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68/push 0/imm32
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50/push-eax
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# . . call
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e8/call check-ints-equal/disp32
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# . . discard args
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81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0xc/imm32 # add to esp
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# check length
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58/pop-to-eax
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# . check-ints-equal(eax, 8, msg)
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# . . push args
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68/push "F - test-pop: length"/imm32
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68/push 8/imm32
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50/push-eax
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# . . call
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e8/call check-ints-equal/disp32
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# . . discard args
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81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0xc/imm32 # add to esp
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# . epilogue
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89/copy 3/mod/direct 4/rm32/esp . . . 5/r32/ebp . . # copy ebp to esp
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5d/pop-to-ebp
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c3/return
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top: # s : (addr stack) -> n/eax : int
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# . prologue
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55/push-ebp
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89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp
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# . save registers
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51/push-ecx
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56/push-esi
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# esi = s
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8b/copy 1/mod/*+disp8 5/rm32/ebp . . . 6/r32/esi 8/disp8 . # copy *(ebp+8) to esi
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# if (s->top <= 0) abort
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81 7/subop/compare 0/mod/indirect 6/rm32/esi . . . . . 0/imm32 # compare *esi
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7e/jump-if-lesser-or-equal $top:abort/disp8
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# n = s->data[s->top - 4]
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8b/copy 0/mod/indirect 6/rm32/esi . . . 1/r32/ecx . . # copy *esi to ecx
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81 5/subop/subtract 3/mod/direct 1/rm32/ecx . . . . . 4/imm32 # subtract from ecx
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8b/copy 1/mod/*+disp8 4/rm32/sib 6/base/esi 1/index/ecx . 0/r32/eax 8/disp8 . # copy *(esi+ecx+8) to eax
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$top:end:
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# . restore registers
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5e/pop-to-esi
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59/pop-to-ecx
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# . epilogue
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89/copy 3/mod/direct 4/rm32/esp . . . 5/r32/ebp . . # copy ebp to esp
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5d/pop-to-ebp
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c3/return
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$top:abort:
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# print(stderr, "error: top: nothing left in stack")
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# . write-buffered(Stderr, "error: top: nothing left in stack")
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# . . push args
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68/push "error: top: nothing left in stack"/imm32
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68/push Stderr/imm32
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# . . call
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e8/call write-buffered/disp32
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# . . discard args
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81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
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# . flush(Stderr)
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# . . push args
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68/push Stderr/imm32
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# . . call
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e8/call flush/disp32
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# . . discard args
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81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
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# . syscall(exit, 1)
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bb/copy-to-ebx 1/imm32
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b8/copy-to-eax 1/imm32/exit
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cd/syscall 0x80/imm8
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# never gets here
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test-top:
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# . prologue
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55/push-ebp
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89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp
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# var stack/ecx = stack of size 8 containing just 0x42
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68/push 0/imm32
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68/push 0x42/imm32
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68/push 8/imm32/length
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68/push 4/imm32/top
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89/copy 3/mod/direct 1/rm32/ecx . . . 4/r32/esp . . # copy esp to ecx
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# eax = top(stack)
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# . . push args
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51/push-ecx
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# . . call
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e8/call top/disp32
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# . . discard args
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81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
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# check-ints-equal(eax, 42, msg")
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# . . push args
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68/push "F - test-top: result"/imm32
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68/push 0x42/imm32
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50/push-eax
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# . . call
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e8/call check-ints-equal/disp32
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# . . discard args
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81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0xc/imm32 # add to esp
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# . epilogue
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89/copy 3/mod/direct 4/rm32/esp . . . 5/r32/ebp . . # copy ebp to esp
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5d/pop-to-ebp
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c3/return
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# . . vim:nowrap:textwidth=0
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