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This commit is contained in:
Kartik Agaram 2018-07-27 16:53:47 -07:00
parent 071afeff5d
commit 013d95266d
7 changed files with 55 additions and 49 deletions
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3
subx/ex1.1.subx
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@ -4,6 +4,9 @@
# To run:
# $ subx translate ex1.1.subx ex1
# $ subx run ex1
# Expected result:
# $ echo $?
# 42
== 0x08048054 # code segment, after leaving room for ELF header
# opcode ModR/M SIB displacement immediate

9
subx/ex1.2.subx
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@ -4,14 +4,17 @@
# To run:
# $ subx translate ex1.2.subx ex1
# $ subx run ex1
# Expected result:
# $ echo $?
# 42
== 0x08048054 # code segment, after leaving room for ELF header
# instruction effective address operand 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
bb 2a/imm32 # copy 42 to EBX
bb/copy 2a/imm32 # copy 42 to EBX
# exit(EBX)
b8 1/imm32 # copy 1 to EAX
cd 0x80/imm8 # int 80h
b8/copy 1/imm32 # copy 1 to EAX
cd/syscall 0x80/imm8 # int 80h
# vim:ft=subx

8
subx/ex2.subx
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@ -11,10 +11,10 @@
# instruction effective address operand 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
bb 1/imm32 # copy 1 to EBX
81 0/add/subop 3/mod/direct 3/ebx/rm32 1/imm32 # add 1 to EBX
bb/copy 1/imm32 # copy 1 to EBX
81 0/subop/add 3/mod/direct 3/rm32/ebx 1/imm32 # add 1 to EBX
# exit(EBX)
b8 1/imm32 # copy 1 to EAX
cd 0x80/imm8 # int 80h
b8/copy 1/imm32 # copy 1 to EAX
cd/syscall 0x80/imm8 # int 80h
# vim:ft=subx

14
subx/ex3.subx
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@ -12,24 +12,24 @@
# 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
# result: EBX = 0
bb 0/imm32 # copy 0 to EBX
bb/copy 0/imm32 # copy 0 to EBX
# counter: ECX = 1
b9 1/imm32 # copy 1 to ECX
b9/copy 1/imm32 # copy 1 to ECX
loop:
# while (ECX <= 10)
81 7/subop/compare 3/mod/direct 1/rm32/ecx 0xa/imm32 # compare ECX, 10/imm
7f exit/disp8 # jump-if-greater
7f/jump-if exit/disp8 # jump-if-greater exit
# EBX += ECX
01 3/mod/direct 3/rm32/ebx 1/r32/ecx # add ECX to EBX
01/add 3/mod/direct 3/rm32/ebx 1/r32/ecx # add ECX to EBX
# ECX++
81 0/subop/add 3/mod/direct 1/rm32/ecx 1/imm32 # add 1 to ECX
# loop
eb loop/disp8 # jump
eb/jump loop/disp8 # jump loop
exit:
# exit(EBX)
b8 1/imm32 # copy 1 to EAX
cd 0x80/imm8 # int 80h
b8/copy 1/imm32 # copy 1 to EAX
cd/syscall 0x80/imm8 # int 80h
# vim:ft=subx:nowrap

24
subx/ex4.subx
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@ -11,31 +11,31 @@
## read(stdin, x, 1)
# fd = 0 (stdin)
bb 0/imm32 # copy 0 to EBX
bb/copy 0/imm32 # copy 0 to EBX
# set location to write to
b9 0x080490a7/imm32 # copy to ECX
b9/copy 0x080490a7/imm32 # copy to ECX
# size = 1 character
ba 1/imm32 # copy 1 to EDX
ba/copy 1/imm32 # copy 1 to EDX
# syscall = read
b8 3/imm32 # copy 3 to EAX
b8/copy 3/imm32 # copy 3 to EAX
# call
cd 0x80/imm8 # int 80h
cd/syscall 0x80/imm8 # int 80h
## write(stdout, x, 1)
# fd = 1 (stdout)
bb 1/imm32 # copy 1 to EBX
bb/copy 1/imm32 # copy 1 to EBX
# set location to write to
b9 0x080490a7/imm32 # copy to ECX
b9/copy 0x080490a7/imm32 # copy to ECX
# size = 1 character
ba 1/imm32 # copy 1 to EDX
ba/copy 1/imm32 # copy 1 to EDX
# syscall = write
b8 4/imm32 # copy 4 to EAX
b8/copy 4/imm32 # copy 4 to EAX
# call
cd 0x80/imm8 # int 80h
cd/syscall 0x80/imm8 # int 80h
## exit(EBX)
b8 1/imm32 # copy 1 to EAX
cd 0x80/imm8 # int 80h
b8/copy 1/imm32 # copy 1 to EAX
cd/syscall 0x80/imm8 # int 80h
== 0x080490a7
00 00 00 00 # space for read() to write to

30
subx/ex5.subx
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@ -11,37 +11,37 @@
## function main
# prolog
55 # push EBP
89 3/mod/direct 5/rm32/EBP 4/r32/ESP # copy ESP to EBP
55/push # push EBP
89/copy 3/mod/direct 5/rm32/EBP 4/r32/ESP # copy ESP to EBP
# allocate x on the stack
81 5/subop/subtract 3/mod/direct 4/rm32/ESP 4/imm32 # subtract 4 bytes from ESP
81 5/subop/subtract 3/mod/direct 4/rm32/ESP 4/imm32 # subtract 4 bytes from ESP
## read(stdin, x, 1)
# fd = 0 (stdin)
bb 0/imm32 # copy 0 to EBX
bb/copy 0/imm32 # copy 0 to EBX
# set location to read character to
89 3/mod/direct 1/rm32/ECX 5/r32/EBP # copy EBP to ECX
89/copy 3/mod/direct 1/rm32/ECX 5/r32/EBP # copy EBP to ECX
# size = 1 character
ba 1/imm32 # copy 1 to EDX
ba/copy 1/imm32 # copy 1 to EDX
# syscall = read
b8 3/imm32 # copy 3 to EAX
b8/copy 3/imm32 # copy 3 to EAX
# call
cd 0x80/imm8 # int 80h
cd/syscall 0x80/imm8 # int 80h
## write(stdout, x, 1)
# fd = 1 (stdout)
bb 1/imm32 # copy 1 to EBX
bb/copy 1/imm32 # copy 1 to EBX
# set location of character to write out
89 3/mod/direct 1/rm32/ECX 5/r32/EBP # copy EBP to ECX
89/copy 3/mod/direct 1/rm32/ECX 5/r32/EBP # copy EBP to ECX
# size = 1 character
ba 1/imm32 # copy 1 to EDX
ba/copy 1/imm32 # copy 1 to EDX
# syscall = write
b8 4/imm32 # copy 4 to EAX
b8/copy 4/imm32 # copy 4 to EAX
# call
cd 0x80/imm8 # int 80h
cd/syscall 0x80/imm8 # int 80h
## exit(EBX)
b8 1/imm32 # copy 1 to EAX
cd 0x80/imm8 # int 80h
b8/copy 1/imm32 # copy 1 to EAX
cd/syscall 0x80/imm8 # int 80h
# vim:ft=subx:nowrap

16
subx/ex6.subx
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@ -12,20 +12,20 @@
## write(stdout, x, 1)
# fd = 1 (stdout)
bb 1/imm32 # copy 1 to EBX
bb/copy 1/imm32 # copy 1 to EBX
# set location to write out
b9 0x08049097/imm32 # copy to ECX
b9/copy 0x08049097/imm32 # copy to ECX
# set size
ba 0x08049093/imm32 # copy to EDX
8b 0/mod/indirect 2/rm32/edx 2/r32/edx # copy *EDX to EDX
ba/copy 0x08049093/imm32 # copy to EDX
8b/copy 0/mod/indirect 2/rm32/edx 2/r32/edx # copy *EDX to EDX
# syscall = write
b8 4/imm32 # copy 4 to EAX
b8/copy 4/imm32 # copy 4 to EAX
# call
cd 0x80/imm8 # int 80h
cd/syscall 0x80/imm8 # int 80h
## exit(EBX)
b8 1/imm32 # copy 1 to EAX
cd 0x80/imm8 # int 80h
b8/copy 1/imm32 # copy 1 to EAX
cd/syscall 0x80/imm8 # int 80h
== 0x08049093
# size of string