diff options
Diffstat (limited to 'apps/ex5.subx')
| -rw-r--r-- | apps/ex5.subx | 40 |
1 files changed, 0 insertions, 40 deletions
diff --git a/apps/ex5.subx b/apps/ex5.subx deleted file mode 100644 index a2b0eeba..00000000 --- a/apps/ex5.subx +++ /dev/null @@ -1,40 +0,0 @@ -# Read a character from stdin, save it to a local on the stack, write it to stdout. -# -# To run: -# $ ./bootstrap translate init.linux apps/ex5.subx -o apps/ex5 -# $ ./bootstrap run apps/ex5 - -== 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: - - # allocate x on the stack - 81 5/subop/subtract 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # subtract from esp - - # read(stdin, x, 1) - # . fd = 0 (stdin) - bb/copy-to-ebx 0/imm32 - # . data = x (location to write result to) - 8d/copy-address 1/mod/*+disp8 4/rm32/sib 4/base/esp 4/index/none 1/r32/ecx 4/disp8 . # copy esp+4 to ecx - # . size = 1 character - ba/copy-to-edx 1/imm32 - # . syscall - e8/call syscall_read/disp32 - - # syscall(write, stdout, x, 1) - # . fd = 1 (stdout) - bb/copy-to-ebx 1/imm32 - # . data = x (location to read from) - 8d/copy-address 1/mod/*+disp8 4/rm32/sib 4/base/esp 4/index/none 1/r32/ecx 4/disp8 . # copy esp+4 to ecx - # . size = 1 character - ba/copy-to-edx 1/imm32 - # . syscall - e8/call syscall_write/disp32 - - # exit(ebx) - e8/call syscall_exit/disp32 - -# . . vim:nowrap:textwidth=0 |