diff options
| -rw-r--r-- | subx/ex1.1.subx | 12 | ||||
| -rw-r--r-- | subx/ex1.2.subx | 12 | ||||
| -rw-r--r-- | subx/ex2.subx | 14 | ||||
| -rw-r--r-- | subx/ex3.subx | 24 | ||||
| -rw-r--r-- | subx/ex4.subx | 30 | ||||
| -rw-r--r-- | subx/ex5.subx | 37 | ||||
| -rw-r--r-- | subx/ex6.subx | 12 |
7 files changed, 70 insertions, 71 deletions
diff --git a/subx/ex1.1.subx b/subx/ex1.1.subx index 220af79e..51152f47 100644 --- a/subx/ex1.1.subx +++ b/subx/ex1.1.subx @@ -6,12 +6,12 @@ # $ subx run ex1 == 0x08048054 # code segment, after leaving room for ELF header -# opcode ModR/M SIB displacement immediate -# instruction mod, reg, Reg/Mem bits scale, index, base -# 1-3 bytes 0/1 byte 0/1 byte 0/1/2/4 bytes 0/1/2/4 bytes - bb 2a 00 00 00 # copy 0x2a (42) to EBX +# 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 00 00 00 # copy 0x2a (42) to EBX # exit(EBX) - b8 01 00 00 00 # copy 1 to EAX - cd 80 # int 80h + b8 01 00 00 00 # copy 1 to EAX + cd 80 # int 80h # vim:ft=subx diff --git a/subx/ex1.2.subx b/subx/ex1.2.subx index 81f2bfe2..1dac17e5 100644 --- a/subx/ex1.2.subx +++ b/subx/ex1.2.subx @@ -6,12 +6,12 @@ # $ subx run ex1 == 0x08048054 # code segment, after leaving room for ELF header -# opcode ModR/M SIB displacement immediate -# instruction mod, reg, Reg/Mem bits scale, index, base -# 1-3 bytes 0/1 byte 0/1 byte 0/1/2/4 bytes 0/1/2/4 bytes - bb 42/imm32 # copy 0x2a (42) to EBX +# 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 42/imm32 # copy 0x2a (42) to EBX # exit(EBX) - b8 1/imm32 # copy 1 to EAX - cd 128/imm8 # int 80h + b8 1/imm32 # copy 1 to EAX + cd 128/imm8 # int 80h # vim:ft=subx diff --git a/subx/ex2.subx b/subx/ex2.subx index 21c0ec54..19c9bb93 100644 --- a/subx/ex2.subx +++ b/subx/ex2.subx @@ -8,13 +8,13 @@ # 2 == 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 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 +# 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 # exit(EBX) - b8 1/imm32 # copy 1 to EAX - cd 128/imm8 # int 80h + b8 1/imm32 # copy 1 to EAX + cd 128/imm8 # int 80h # vim:ft=subx diff --git a/subx/ex3.subx b/subx/ex3.subx index 9b5391a8..f9df8703 100644 --- a/subx/ex3.subx +++ b/subx/ex3.subx @@ -8,29 +8,29 @@ # 55 == 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 0/1/2/4 bytes 0/1/2/4 bytes +# 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 # result: EBX = 0 # 0: e_entry = 0x08048054 - bb 0/imm32 # copy 0 to EBX + bb 0/imm32 # copy 0 to EBX # counter: ECX = 1 - b9 1/imm32 # copy 1 to ECX + b9 1/imm32 # copy 1 to ECX # 10: loop: 0x0804805e # while (ECX <= 10) - 81 7/subop/compare 3/mod/direct 1/rm32/ecx 10/imm32 # compare ECX, 10/imm - 7f 10/disp8 # jump-if-greater exit + 81 7/subop/compare 3/mod/direct 1/rm32/ecx 10/imm32 # compare ECX, 10/imm + 7f 10/disp8 # jump-if-greater exit # EBX += ECX - 01 3/mod/direct 3/rm32/ebx 1/r32/ecx # add ECX to EBX + 01 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 + 81 0/subop/add 3/mod/direct 1/rm32/ecx 1/imm32 # add 1 to ECX # loop - eb -18/disp8 # jump loop + eb -18/disp8 # jump loop # 28: exit: 0x08048070 # exit(EBX) - b8 1/imm32 # copy 1 to EAX - cd 0x80/imm8 # int 80h + b8 1/imm32 # copy 1 to EAX + cd 0x80/imm8 # int 80h # vim:ft=subx:nowrap diff --git a/subx/ex4.subx b/subx/ex4.subx index 2d841a81..81c65dae 100644 --- a/subx/ex4.subx +++ b/subx/ex4.subx @@ -5,37 +5,37 @@ # $ subx run ex4 == 0x08048074 # code segment, after leaving room for ELF header and segment headers -# instruction effective address operand displacement immediate -# op subop mod rm32 base index scale r32 -# 1-3 bytes 0/1/2/4 bytes 0/1/2/4 bytes +# 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 ## read(stdin, x, 1) # fd = 0 (stdin) - bb 0/imm32 # copy 0 to EBX + bb 0/imm32 # copy 0 to EBX # set location to write to - b9 0x080490a7/imm32 # copy to ECX + b9 0x080490a7/imm32 # copy to ECX # size = 1 character - ba 1/imm32 # copy 1 to EDX + ba 1/imm32 # copy 1 to EDX # syscall = read - b8 3/imm32 # copy 3 to EAX + b8 3/imm32 # copy 3 to EAX # call - cd 128/imm8 # int 80h + cd 128/imm8 # int 80h ## write(stdout, x, 1) # fd = 1 (stdout) - bb 1/imm32 # copy 1 to EBX + bb 1/imm32 # copy 1 to EBX # set location to write to - b9 0x080490a7/imm32 # copy to ECX + b9 0x080490a7/imm32 # copy to ECX # size = 1 character - ba 1/imm32 # copy 1 to EDX + ba 1/imm32 # copy 1 to EDX # syscall = write - b8 4/imm32 # copy 4 to EAX + b8 4/imm32 # copy 4 to EAX # call - cd 128/imm8 # int 80h + cd 128/imm8 # int 80h ## exit(EBX) - b8 1/imm32 # copy 1 to EAX - cd 128/imm8 # int 80h + b8 1/imm32 # copy 1 to EAX + cd 128/imm8 # int 80h == 0x080490a7 00 00 00 00 # space for read() to write to diff --git a/subx/ex5.subx b/subx/ex5.subx index b74af463..65ca4807 100644 --- a/subx/ex5.subx +++ b/subx/ex5.subx @@ -5,44 +5,43 @@ # $ subx run ex5 == 0x08048054 # code segment, after leaving room for ELF header and segment headers -# instruction effective address operand displacement immediate -# op subop mod rm32 base index scale r32 -# 1-3 bytes 0/1/2/4 bytes 0/1/2/4 bytes +# 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 ## function main # prolog - 55 # push EBP - 89 3/mod/direct 5/rm32/EBP 4/r32/ESP # copy ESP to EBP + 55 # push EBP + 89 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 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 3/mod/direct 1/rm32/ECX 5/r32/EBP # copy EBP to ECX # size = 1 character - ba 1/imm32 # copy 1 to EDX + ba 1/imm32 # copy 1 to EDX # syscall = read - b8 3/imm32 # copy 3 to EAX + b8 3/imm32 # copy 3 to EAX # call - cd 0x80/imm8 # int 80h + cd 0x80/imm8 # int 80h ## write(stdout, x, 1) # fd = 1 (stdout) - bb 1/imm32 # copy 1 to EBX + bb 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 - # ModR/M: 11 (direct mode) 101 (src EBP) 001 (dest ECX) + 89 3/mod/direct 1/rm32/ECX 5/r32/EBP # copy EBP to ECX # size = 1 character - ba 1/imm32 # copy 1 to EDX + ba 1/imm32 # copy 1 to EDX # syscall = write - b8 4/imm32 # copy 4 to EAX + b8 4/imm32 # copy 4 to EAX # call - cd 0x80/imm8 # int 80h + cd 0x80/imm8 # int 80h ## exit(EBX) - b8 1/imm32 # copy 1 to EAX - cd 0x80/imm8 # int 80h + b8 1/imm32 # copy 1 to EAX + cd 0x80/imm8 # int 80h # vim:ft=subx:nowrap diff --git a/subx/ex6.subx b/subx/ex6.subx index 5e4f34f5..68dcb8be 100644 --- a/subx/ex6.subx +++ b/subx/ex6.subx @@ -6,9 +6,9 @@ # Hello, world! == 0x08048074 # code segment, after leaving room for ELF header and segment headers -# instruction effective address operand displacement immediate +# instruction effective address operand displacement immediate # op subop mod rm32 base index scale r32 -# 1-3 bytes 0/1/2/4 bytes 0/1/2/4 bytes +# 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 ## write(stdout, x, 1) # fd = 1 (stdout) @@ -19,13 +19,13 @@ ba 0x08049093/imm32 # copy to EDX 8b 0/mod/indirect 2/rm32/edx 2/r32/edx # copy *EDX to EDX # syscall = write - b8 4/imm32 # copy 4 to EAX + b8 4/imm32 # copy 4 to EAX # call - cd 0x80/imm8 # int 80h + cd 0x80/imm8 # int 80h ## exit(EBX) - b8 1/imm32 # copy 1 to EAX - cd 0x80/imm8 # int 80h + b8 1/imm32 # copy 1 to EAX + cd 0x80/imm8 # int 80h == 0x08049093 # size of string |