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author | Kartik Agaram <vc@akkartik.com> | 2020-01-01 17:23:29 -0800 |
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committer | Kartik Agaram <vc@akkartik.com> | 2020-01-01 17:23:29 -0800 |
commit | 113bae7311b63e55e55160970718d19bfeeb56c3 (patch) | |
tree | d2468b58470e173329c7ef6e8da496c2f768b037 /apps/ex6.subx | |
parent | 1b050736eea04323e09e5e8e7499c33cee1899d0 (diff) | |
download | mu-113bae7311b63e55e55160970718d19bfeeb56c3.tar.gz |
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Diffstat (limited to 'apps/ex6.subx')
-rw-r--r-- | apps/ex6.subx | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/apps/ex6.subx b/apps/ex6.subx new file mode 100644 index 00000000..42612578 --- /dev/null +++ b/apps/ex6.subx @@ -0,0 +1,35 @@ +# Print out a (global variable) string to stdout. +# +# To run: +# $ ./subx translate init.linux examples/ex6.subx -o examples/ex6 +# $ ./subx run examples/ex6 +# Hello, world! + +== code + +# . 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: + # write(stdout, X, Size) + # . fd = 1 (stdout) + bb/copy-to-ebx 1/imm32 + # . initialize X (location to write result to) + b9/copy-to-ecx X/imm32 + # . initialize Size + 8b/copy 0/mod/indirect 5/rm32/.disp32 . . 2/r32/edx Size/disp32 . # copy *Size to edx + # . syscall + e8/call syscall_write/disp32 + + # exit(ebx) + e8/call syscall_exit/disp32 + +== data + +Size: # size of string + 0x0e/imm32 # 14 +X: # string to print + 48 65 6c 6c 6f 2c 20 77 6f 72 6c 64 21 0a 00 +# H e l l o , ␣ w o r l d ! newline null + +# . . vim:nowrap:textwidth=0 |