diff options
Diffstat (limited to 'subx/ex6.subx')
| -rw-r--r-- | subx/ex6.subx | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/subx/ex6.subx b/subx/ex6.subx new file mode 100644 index 00000000..5e4f34f5 --- /dev/null +++ b/subx/ex6.subx @@ -0,0 +1,37 @@ +## print out a (global variable) string to stdout +# +# To run: +# $ subx translate ex6.subx ex6 +# $ subx run ex6 +# Hello, world! + +== 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 + + ## write(stdout, x, 1) + # fd = 1 (stdout) + bb 1/imm32 # copy 1 to EBX + # set location to write out + b9 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 + # syscall = write + b8 4/imm32 # copy 4 to EAX + # call + cd 0x80/imm8 # int 80h + + ## exit(EBX) + b8 1/imm32 # copy 1 to EAX + cd 0x80/imm8 # int 80h + +== 0x08049093 +# size of string +0e 00 00 00 +# string + 48 65 6c 6c 6f 2c 20 77 6f 72 6c 64 21 0a +# h e l l o , ␣ w o r l d ! newline + +# vim:ft=subx:nowrap |