diff options
Diffstat (limited to 'apps/ex7.subx')
| -rw-r--r-- | apps/ex7.subx | 98 |
1 files changed, 0 insertions, 98 deletions
diff --git a/apps/ex7.subx b/apps/ex7.subx deleted file mode 100644 index 73cb2720..00000000 --- a/apps/ex7.subx +++ /dev/null @@ -1,98 +0,0 @@ -# Example showing file syscalls. -# -# Create a file, open it for writing, write a character to it, close it, open -# it for reading, read a character from it, close it, delete it, and return -# the character read. -# -# To run: -# $ ./bootstrap translate init.linux apps/ex7.subx -o apps/ex7 -# $ ./bootstrap run apps/ex7 -# Expected result: -# $ echo $? -# 97 - -== 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: - # creat(Filename) - bb/copy-to-ebx Filename/imm32 - b9/copy-to-ecx 0x180/imm32/fixed-perms - e8/call syscall_creat/disp32 - - # stream = open(Filename, O_WRONLY, 0) # we can't use 'fd' because it looks like a hex byte - bb/copy-to-ebx Filename/imm32 - b9/copy-to-ecx 1/imm32/wronly - ba/copy-to-edx 0x180/imm32/fixed-perms - e8/call syscall_open/disp32 - # save stream - bb/copy-to-ebx Stream/imm32 - 89/copy 0/mod/indirect 3/rm32/ebx . . . 0/r32/eax . . # copy eax to *ebx - - # write(Stream, "a", 1) - # . load stream - bb/copy-to-ebx Stream/imm32 - 8b/copy 0/mod/indirect 3/rm32/ebx . . . 3/r32/ebx . . # copy *ebx to ebx - # . - b9/copy-to-ecx A/imm32 - ba/copy-to-edx 1/imm32/size - e8/call syscall_write/disp32 - - # close(Stream) - # . load stream - bb/copy-to-ebx Stream/imm32 - 8b/copy 0/mod/indirect 3/rm32/ebx . . . 3/r32/ebx . . # copy *ebx to ebx - # . - e8/call syscall_close/disp32 - - # stream = open(Filename, O_RDONLY, 0) - bb/copy-to-ebx Filename/imm32 - b9/copy-to-ecx 0/imm32/rdonly - ba/copy-to-edx 0x180/imm32/fixed-perms - e8/call syscall_open/disp32 - # . save Stream - bb/copy-to-ebx Stream/imm32 - 89/copy 0/mod/indirect 3/rm32/ebx . . . 0/r32/eax . . # copy eax to *ebx - - # read(Stream, B, 1) - # . load stream - bb/copy-to-ebx Stream/imm32 - 8b/copy 0/mod/indirect 3/rm32/ebx . . . 3/r32/ebx . . # copy *ebx to ebx - # . - b9/copy-to-ecx B/imm32 - ba/copy-to-edx 1/imm32/size - e8/call syscall_read/disp32 - - # close(Stream) - # . load stream - bb/copy-to-ebx Stream/imm32 - 8b/copy 0/mod/indirect 3/rm32/ebx . . . 3/r32/ebx . . # copy *ebx to ebx - # - e8/call syscall_close/disp32 - - # unlink(filename) - bb/copy-to-ebx Filename/imm32 - e8/call syscall_unlink/disp32 - - # exit(b) - # . load b - bb/copy-to-ebx B/imm32 - 8b/copy 0/mod/indirect 3/rm32/ebx . . . 3/r32/ebx . . # copy *ebx to ebx - # - e8/call syscall_exit/disp32 - -== data - -Stream: - 0/imm32 -A: - 61/imm32/A -B: - 0/imm32 -Filename: - 2e 66 6f 6f 00 00 00 00 -# . f o o null - -# . . vim:nowrap:textwidth=0 |