2019-04-24 03:25:04 +00:00
|
|
|
# Helper to print an int32 in decimal.
|
|
|
|
|
|
|
|
|
|
== 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
|
|
|
|
|
|
|
|
|
|
#? Entry: # run a single test, while debugging
|
|
|
|
|
#? e8/call test-print-int32-decimal/disp32
|
|
|
|
|
#? # syscall(exit, Num-test-failures)
|
|
|
|
|
#? 8b/copy 0/mod/indirect 5/rm32/.disp32 . . 3/r32/EBX Num-test-failures/disp32 # copy *Num-test-failures to EBX
|
|
|
|
|
#? b8/copy-to-EAX 1/imm32/exit
|
|
|
|
|
#? cd/syscall 0x80/imm8
|
|
|
|
|
|
|
|
|
|
print-int32-decimal: # out : (address stream), n : int32
|
|
|
|
|
# works by generating characters from lowest to highest and pushing them
|
|
|
|
|
# to the stack, before popping them one by one into the stream
|
|
|
|
|
#
|
|
|
|
|
# pseudocode:
|
|
|
|
|
# copy ESP to EBX
|
2019-04-24 04:08:17 +00:00
|
|
|
# EAX = |n|
|
2019-04-24 03:25:04 +00:00
|
|
|
# while true
|
|
|
|
|
# if (EAX == 0) break
|
|
|
|
|
# sign-extend EAX into EDX
|
|
|
|
|
# EAX, EDX = EAX/10, EAX%10
|
|
|
|
|
# push EDX
|
|
|
|
|
# if n < 0
|
2019-04-24 04:13:31 +00:00
|
|
|
# push '-' - '0' = -3
|
|
|
|
|
# max/ECX = &out->data[out->length]
|
2019-04-24 03:25:04 +00:00
|
|
|
# w/EAX = out->write
|
2019-04-24 04:13:31 +00:00
|
|
|
# curr/EDI = &out->data[out->write]
|
2019-04-24 03:25:04 +00:00
|
|
|
# while true
|
|
|
|
|
# if (ESP == EBX) break
|
|
|
|
|
# if (curr >= max) abort
|
|
|
|
|
# pop into EDX
|
|
|
|
|
# EDX += '0' # convert decimal digit to ascii
|
|
|
|
|
# *curr = DL
|
|
|
|
|
# ++curr
|
|
|
|
|
# ++w
|
|
|
|
|
# out->write = w
|
|
|
|
|
#
|
|
|
|
|
# . prolog
|
|
|
|
|
55/push-EBP
|
|
|
|
|
89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP
|
|
|
|
|
# . save registers
|
|
|
|
|
50/push-EAX
|
|
|
|
|
51/push-ECX
|
|
|
|
|
52/push-EDX
|
|
|
|
|
53/push-EBX
|
|
|
|
|
57/push-EDI
|
|
|
|
|
# copy ESP to EBX
|
|
|
|
|
89/copy 3/mod/direct 3/rm32/EBX . . . 4/r32/ESP . . # copy ESP to EBX
|
|
|
|
|
# ten/ECX = 10
|
|
|
|
|
b9/copy-to-ECX 0xa/imm32
|
|
|
|
|
# EAX = |n|
|
|
|
|
|
8b/copy 1/mod/*+disp8 5/rm32/EBP . . . 0/r32/EAX 0xc/disp8 . # copy *(EBP+12) to EAX
|
|
|
|
|
3d/compare-EAX-with 0/imm32
|
|
|
|
|
7d/jump-if-greater-or-equal $print-int32-decimal:read-loop/disp8
|
|
|
|
|
$print-int32-decimal:negative:
|
|
|
|
|
f7 3/subop/negate 3/mod/direct 0/rm32/EAX . . . . . . # negate EAX
|
|
|
|
|
$print-int32-decimal:read-loop:
|
|
|
|
|
# if (EAX == 0) break
|
|
|
|
|
3d/compare-EAX-and 0/imm32
|
|
|
|
|
74/jump-if-equal $print-int32-decimal:read-break/disp8
|
|
|
|
|
# sign-extend
|
|
|
|
|
99/sign-extend-EAX-into-EDX
|
|
|
|
|
# EAX, EDX = divide-with-remainder EAX/ten, EAX%ten
|
|
|
|
|
f7 7/subop/divide-by 3/mod/direct 1/rm32/ECX . . . . . . # divide EDX:EAX by ECX, storing quotient in EAX and remainder in EDX
|
|
|
|
|
# push EDX
|
|
|
|
|
52/push-EDX
|
|
|
|
|
eb/jump $print-int32-decimal:read-loop/disp8
|
|
|
|
|
$print-int32-decimal:read-break:
|
|
|
|
|
# if (n < 0) push('-')
|
|
|
|
|
81 7/subop/compare 1/mod/*+disp8 5/rm32/EBP . . . . 0xc/disp8 0/imm32 # compare *(EBP+12)
|
|
|
|
|
7d/jump-if-greater-or-equal $print-int32-decimal:write/disp8
|
|
|
|
|
$print-int32-decimal:push-negative:
|
|
|
|
|
68/push -3/imm32/dash-minus-zero
|
|
|
|
|
# fall through
|
|
|
|
|
$print-int32-decimal:write:
|
|
|
|
|
# EDI = out
|
|
|
|
|
8b/copy 1/mod/*+disp8 5/rm32/EBP . . . 7/r32/EDI 8/disp8 . # copy *(EBP+8) to EDI
|
|
|
|
|
# max/ECX = &out->data[out->length]
|
|
|
|
|
8b/copy 1/mod/*+disp8 7/rm32/EDI . . . 1/r32/ECX 8/disp8 . # copy *(EDI+8) to ECX
|
|
|
|
|
8d/copy-address 1/mod/*+disp8 4/rm32/sib 7/base/EDI 1/index/ECX . 1/r32/ECX 0xc/disp8 . # copy EDI+ECX+12 to ECX
|
|
|
|
|
# w/EAX = out->write
|
|
|
|
|
8b/copy 0/mod/indirect 7/rm32/EDI . . . 0/r32/EAX . . # copy *EDI to EAX
|
|
|
|
|
# curr/EDI = &out->data[out->write]
|
|
|
|
|
8d/copy-address 1/mod/*+disp8 4/rm32/sib 7/base/EDI 0/index/EAX . 7/r32/EDI 0xc/disp8 . # copy EDI+EAX+12 to EDI
|
|
|
|
|
$print-int32-decimal:write-loop:
|
|
|
|
|
# if (ESP == EBX) break
|
|
|
|
|
39/compare 3/mod/direct 4/rm32/ESP . . . 3/r32/EBX . . # compare ESP and EBX
|
|
|
|
|
74/jump-if-equal $print-int32-decimal:write-break/disp8
|
|
|
|
|
# if (curr >= max) abort
|
|
|
|
|
39/compare 3/mod/direct 7/rm32/EDI . . . 1/r32/ECX . . # compare EDI and ECX
|
|
|
|
|
7d/jump-if-greater-or-equal $print-int32-decimal:abort/disp8
|
|
|
|
|
# pop into EDX
|
|
|
|
|
5a/pop-into-EDX
|
|
|
|
|
# EDX += '0'
|
|
|
|
|
81 0/subop/add 3/mod/direct 2/rm32/EDX . . . . . 0x30/imm32/zero # add to EDX
|
|
|
|
|
$print-int32-decimal:write-char:
|
|
|
|
|
# *curr = DL
|
|
|
|
|
88/copy-byte 0/mod/indirect 7/rm32/EDI . . . 2/r32/DL . . # copy DL to byte at *ECX
|
|
|
|
|
# ++curr
|
|
|
|
|
47/increment-EDI
|
|
|
|
|
# ++w
|
|
|
|
|
40/increment-EAX
|
|
|
|
|
eb/jump $print-int32-decimal:write-loop/disp8
|
|
|
|
|
$print-int32-decimal:write-break:
|
|
|
|
|
# out->write = w
|
|
|
|
|
8b/copy 1/mod/*+disp8 5/rm32/EBP . . . 7/r32/EDI 8/disp8 . # copy *(EBP+8) to EDI
|
|
|
|
|
89/copy 0/mod/indirect 7/rm32/EDI . . . 0/r32/EAX . . # copy EAX to *EDI
|
|
|
|
|
$print-int32-decimal:end:
|
|
|
|
|
# . restore registers
|
|
|
|
|
5f/pop-to-EDI
|
|
|
|
|
5b/pop-to-EBX
|
|
|
|
|
5a/pop-to-EDX
|
|
|
|
|
59/pop-to-ECX
|
|
|
|
|
58/pop-to-EAX
|
|
|
|
|
# . epilog
|
|
|
|
|
89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP
|
|
|
|
|
5d/pop-to-EBP
|
|
|
|
|
c3/return
|
|
|
|
|
|
|
|
|
|
$print-int32-decimal:abort:
|
|
|
|
|
# . _write(2/stderr, error)
|
|
|
|
|
# . . push args
|
|
|
|
|
68/push "print-int32-decimal: out of space"/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
|
|
|
|
|
b8/copy-to-EAX 1/imm32/exit
|
|
|
|
|
cd/syscall 0x80/imm8
|
|
|
|
|
# never gets here
|
|
|
|
|
|
|
|
|
|
test-print-int32-decimal:
|
|
|
|
|
# check that a single-digit number converts correctly
|
|
|
|
|
# setup
|
|
|
|
|
# . clear-stream(_test-stream)
|
|
|
|
|
# . . push args
|
|
|
|
|
68/push _test-stream/imm32
|
|
|
|
|
# . . call
|
|
|
|
|
e8/call clear-stream/disp32
|
|
|
|
|
# . . discard args
|
|
|
|
|
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
|
|
|
|
|
# print-int32-decimal(_test-stream, 9)
|
|
|
|
|
# . . push args
|
|
|
|
|
68/push 9/imm32
|
|
|
|
|
68/push _test-stream/imm32
|
|
|
|
|
# . . call
|
|
|
|
|
e8/call print-int32-decimal/disp32
|
|
|
|
|
# . . discard args
|
|
|
|
|
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
|
|
|
|
|
# check-stream-equal(_test-stream, "9", msg)
|
|
|
|
|
# . . push args
|
|
|
|
|
68/push "F - test-print-int32-decimal"/imm32
|
|
|
|
|
68/push "9"/imm32
|
|
|
|
|
68/push _test-stream/imm32
|
|
|
|
|
# . . call
|
|
|
|
|
e8/call check-stream-equal/disp32
|
|
|
|
|
# . . discard args
|
|
|
|
|
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add to ESP
|
|
|
|
|
# . end
|
|
|
|
|
c3/return
|
|
|
|
|
|
|
|
|
|
test-print-int32-decimal-multiple-digits:
|
|
|
|
|
# check that a multi-digit number converts correctly
|
|
|
|
|
# setup
|
|
|
|
|
# . clear-stream(_test-stream)
|
|
|
|
|
# . . push args
|
|
|
|
|
68/push _test-stream/imm32
|
|
|
|
|
# . . call
|
|
|
|
|
e8/call clear-stream/disp32
|
|
|
|
|
# . . discard args
|
|
|
|
|
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
|
|
|
|
|
# print-int32-decimal(_test-stream, 10)
|
|
|
|
|
# . . push args
|
|
|
|
|
68/push 0xa/imm32
|
|
|
|
|
68/push _test-stream/imm32
|
|
|
|
|
# . . call
|
|
|
|
|
e8/call print-int32-decimal/disp32
|
|
|
|
|
# . . discard args
|
|
|
|
|
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
|
|
|
|
|
# check-stream-equal(_test-stream, "10", msg)
|
|
|
|
|
# . . push args
|
|
|
|
|
68/push "F - test-print-int32-decimal-multiple-digits"/imm32
|
|
|
|
|
68/push "10"/imm32
|
|
|
|
|
68/push _test-stream/imm32
|
|
|
|
|
# . . call
|
|
|
|
|
e8/call check-stream-equal/disp32
|
|
|
|
|
# . . discard args
|
|
|
|
|
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add to ESP
|
|
|
|
|
# . end
|
|
|
|
|
c3/return
|
|
|
|
|
|
|
|
|
|
test-print-int32-decimal-negative:
|
|
|
|
|
# check that a negative single-digit number converts correctly
|
|
|
|
|
# setup
|
|
|
|
|
# . clear-stream(_test-stream)
|
|
|
|
|
# . . push args
|
|
|
|
|
68/push _test-stream/imm32
|
|
|
|
|
# . . call
|
|
|
|
|
e8/call clear-stream/disp32
|
|
|
|
|
# . . discard args
|
|
|
|
|
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
|
|
|
|
|
# print-int32-decimal(_test-stream, -9)
|
|
|
|
|
# . . push args
|
|
|
|
|
68/push -9/imm32
|
|
|
|
|
68/push _test-stream/imm32
|
|
|
|
|
# . . call
|
|
|
|
|
e8/call print-int32-decimal/disp32
|
|
|
|
|
# . . discard args
|
|
|
|
|
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
|
|
|
|
|
#? # dump _test-stream {{{
|
|
|
|
|
#? # . write(2/stderr, "^")
|
|
|
|
|
#? # . . push args
|
|
|
|
|
#? 68/push "^"/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
|
|
|
|
|
#? # . write-stream(2/stderr, _test-stream)
|
|
|
|
|
#? # . . push args
|
|
|
|
|
#? 68/push _test-stream/imm32
|
|
|
|
|
#? 68/push 2/imm32/stderr
|
|
|
|
|
#? # . . call
|
|
|
|
|
#? e8/call write-stream/disp32
|
|
|
|
|
#? # . . discard args
|
|
|
|
|
#? 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
|
|
|
|
|
#? # . write(2/stderr, "$\n")
|
|
|
|
|
#? # . . push args
|
|
|
|
|
#? 68/push "$\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
|
|
|
|
|
#? # }}}
|
|
|
|
|
# check-stream-equal(_test-stream, "-9", msg)
|
|
|
|
|
# . . push args
|
|
|
|
|
68/push "F - test-print-int32-decimal-negative"/imm32
|
|
|
|
|
68/push "-9"/imm32
|
|
|
|
|
68/push _test-stream/imm32
|
|
|
|
|
# . . call
|
|
|
|
|
e8/call check-stream-equal/disp32
|
|
|
|
|
# . . discard args
|
|
|
|
|
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add to ESP
|
|
|
|
|
# . end
|
|
|
|
|
c3/return
|
|
|
|
|
|
|
|
|
|
test-print-int32-decimal-negative-multiple-digits:
|
|
|
|
|
# check that a multi-digit number converts correctly
|
|
|
|
|
# setup
|
|
|
|
|
# . clear-stream(_test-stream)
|
|
|
|
|
# . . push args
|
|
|
|
|
68/push _test-stream/imm32
|
|
|
|
|
# . . call
|
|
|
|
|
e8/call clear-stream/disp32
|
|
|
|
|
# . . discard args
|
|
|
|
|
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
|
|
|
|
|
# print-int32-decimal(_test-stream, -10)
|
|
|
|
|
# . . push args
|
|
|
|
|
68/push -0xa/imm32
|
|
|
|
|
68/push _test-stream/imm32
|
|
|
|
|
# . . call
|
|
|
|
|
e8/call print-int32-decimal/disp32
|
|
|
|
|
# . . discard args
|
|
|
|
|
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
|
|
|
|
|
# check-stream-equal(_test-stream, "-10", msg)
|
|
|
|
|
# . . push args
|
|
|
|
|
68/push "F - test-print-int32-decimal-negative-multiple-digits"/imm32
|
|
|
|
|
68/push "-10"/imm32
|
|
|
|
|
68/push _test-stream/imm32
|
|
|
|
|
# . . call
|
|
|
|
|
e8/call check-stream-equal/disp32
|
|
|
|
|
# . . discard args
|
|
|
|
|
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add to ESP
|
|
|
|
|
# . end
|
|
|
|
|
c3/return
|
|
|
|
|
|
|
|
|
|
# . . vim:nowrap:textwidth=0
|
