diff options
Diffstat (limited to 'html/subx/053new_segment.subx.html')
| -rw-r--r-- | html/subx/053new_segment.subx.html | 113 |
1 files changed, 59 insertions, 54 deletions
diff --git a/html/subx/053new_segment.subx.html b/html/subx/053new_segment.subx.html index c0c5827d..0290b2f9 100644 --- a/html/subx/053new_segment.subx.html +++ b/html/subx/053new_segment.subx.html @@ -11,14 +11,19 @@ <style type="text/css"> <!-- pre { font-family: monospace; color: #aaaaaa; background-color: #080808; } -body { font-size: 12pt; font-family: monospace; color: #aaaaaa; background-color: #080808; } -a { color:#eeeeee; text-decoration: none; } -a:hover { text-decoration: underline; } -* { font-size: 12pt; font-size: 1em; } -.subxComment { color: #005fff; } -.LineNr { color: #444444; } +body { font-size:12pt; font-family: monospace; color: #aaaaaa; background-color: #080808; } +.subxS2Comment a { color:inherit; } +.subxS1Comment a { color:inherit; } +.subxComment a { color:inherit; } +.subxH2Comment a { color:inherit; } +.subxH1Comment a { color:inherit; } +* { font-size:12pt; font-size: 1em; } +.subxComment { color:#16bfff; } +.subxS2Comment { color:#4466ff; } +.LineNr { color:#444444; } +.subxS1Comment { color:#2d8cff; } .CommentedCode { color: #6c6c6c; } -.subxH2Comment { color: #00afff; } +.subxH1Comment { color:#00ffff; } --> </style> @@ -56,65 +61,65 @@ if ('onhashchange' in window) { <span id="L1" class="LineNr"> 1 </span><span class="subxComment"># Create a new segment (for data) using mmap().</span> <span id="L2" class="LineNr"> 2 </span> <span id="L3" class="LineNr"> 3 </span>== code -<span id="L4" class="LineNr"> 4 </span><span class="subxComment"># instruction effective address operand displacement immediate</span> -<span id="L5" class="LineNr"> 5 </span><span class="subxComment"># op subop mod rm32 base index scale r32</span> -<span id="L6" class="LineNr"> 6 </span><span class="subxComment"># 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</span> +<span id="L4" class="LineNr"> 4 </span><span class="subxComment"># instruction effective address register displacement immediate</span> +<span id="L5" class="LineNr"> 5 </span><span class="subxS1Comment"># . op subop mod rm32 base index scale r32</span> +<span id="L6" class="LineNr"> 6 </span><span class="subxS1Comment"># . 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</span> <span id="L7" class="LineNr"> 7 </span> <span id="L8" class="LineNr"> 8 </span><span class="subxComment"># main: (manual test if this is the last file loaded)</span> -<span id="L9" class="LineNr"> 9 </span> <span class="subxComment"># EAX = new-segment(0x1000)</span> -<span id="L10" class="LineNr">10 </span> <span class="subxComment"># push args</span> -<span id="L11" class="LineNr">11 </span> 68/push 0x1000/imm32 -<span id="L12" class="LineNr">12 </span> <span class="subxComment"># call</span> -<span id="L13" class="LineNr">13 </span> e8/call new-segment/disp32 -<span id="L14" class="LineNr">14 </span> <span class="subxComment"># discard args</span> -<span id="L15" class="LineNr">15 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="CommentedCode"> . </span> <span class="CommentedCode"> . </span> <span class="CommentedCode"> . </span> <span class="CommentedCode"> . </span> <span class="CommentedCode"> . </span> 4/imm32 <span class="subxComment"># add to ESP</span> +<span id="L9" class="LineNr"> 9 </span> <span class="subxComment"># EAX = new-segment(0x1000)</span> +<span id="L10" class="LineNr">10 </span> <span class="subxS2Comment"># . . push args</span> +<span id="L11" class="LineNr">11 </span> 68/push 0x1000/imm32 +<span id="L12" class="LineNr">12 </span> <span class="subxS2Comment"># . . call</span> +<span id="L13" class="LineNr">13 </span> e8/call new-segment/disp32 +<span id="L14" class="LineNr">14 </span> <span class="subxS2Comment"># . . discard args</span> +<span id="L15" class="LineNr">15 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="CommentedCode"> . </span> <span class="CommentedCode"> . </span> <span class="CommentedCode"> . </span> <span class="CommentedCode"> . </span> <span class="CommentedCode"> . </span> 4/imm32 <span class="subxComment"># add to ESP</span> <span id="L16" class="LineNr">16 </span> -<span id="L17" class="LineNr">17 </span> <span class="subxComment"># store to *EAX</span> -<span id="L18" class="LineNr">18 </span> c7/copy 0/mod/direct 0/rm32/EAX <span class="CommentedCode"> . </span> <span class="CommentedCode"> . </span> <span class="CommentedCode"> . </span> <span class="CommentedCode"> . </span> <span class="CommentedCode"> . </span> 0x34/imm32 <span class="subxComment"># copy to *EAX</span> +<span id="L17" class="LineNr">17 </span> <span class="subxComment"># write to *EAX to check that we have access to the newly-allocated segment</span> +<span id="L18" class="LineNr">18 </span> c7/copy 0/mod/direct 0/rm32/EAX <span class="CommentedCode"> . </span> <span class="CommentedCode"> . </span> <span class="CommentedCode"> . </span> <span class="CommentedCode"> . </span> <span class="CommentedCode"> . </span> 0x34/imm32 <span class="subxComment"># copy to *EAX</span> <span id="L19" class="LineNr">19 </span> -<span id="L20" class="LineNr">20 </span> <span class="subxComment"># exit(EAX)</span> -<span id="L21" class="LineNr">21 </span> 89/copy 3/mod/direct 3/rm32/EBX <span class="CommentedCode"> . </span> <span class="CommentedCode"> . </span> <span class="CommentedCode"> . </span> 0/r32/EAX <span class="CommentedCode"> . </span> <span class="CommentedCode"> . </span> <span class="subxComment"># copy EAX to EBX</span> -<span id="L22" class="LineNr">22 </span> b8/copy-to-EAX 1/imm32/exit -<span id="L23" class="LineNr">23 </span> cd/syscall 0x80/imm8 +<span id="L20" class="LineNr">20 </span> <span class="subxComment"># syscall(exit, EAX)</span> +<span id="L21" class="LineNr">21 </span> 89/copy 3/mod/direct 3/rm32/EBX <span class="CommentedCode"> . </span> <span class="CommentedCode"> . </span> <span class="CommentedCode"> . </span> 0/r32/EAX <span class="CommentedCode"> . </span> <span class="CommentedCode"> . </span> <span class="subxComment"># copy EAX to EBX</span> +<span id="L22" class="LineNr">22 </span> b8/copy-to-EAX 1/imm32/exit +<span id="L23" class="LineNr">23 </span> cd/syscall 0x80/imm8 <span id="L24" class="LineNr">24 </span> <span id="L25" class="LineNr">25 </span>new-segment: <span class="subxComment"># len : int -> address</span> -<span id="L26" class="LineNr">26 </span> <span class="subxComment"># prolog</span> -<span id="L27" class="LineNr">27 </span> 55/push-EBP -<span id="L28" class="LineNr">28 </span> 89/copy 3/mod/direct 5/rm32/EBP <span class="CommentedCode"> . </span> <span class="CommentedCode"> . </span> <span class="CommentedCode"> . </span> 4/r32/ESP <span class="CommentedCode"> . </span> <span class="CommentedCode"> . </span> <span class="subxComment"># copy ESP to EBP</span> -<span id="L29" class="LineNr">29 </span> 53/push-EBX -<span id="L30" class="LineNr">30 </span> <span class="subxComment"># copy len to mmap-new-segment.len</span> -<span id="L31" class="LineNr">31 </span> <span class="subxComment"># TODO: compute mmap-new-segment+4 before runtime</span> -<span id="L32" class="LineNr">32 </span> 8b/copy 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none <span class="CommentedCode"> . </span> 0/r32/EAX 8/disp8 <span class="CommentedCode"> . </span> <span class="subxComment"># copy *(EBP+8) to EAX</span> -<span id="L33" class="LineNr">33 </span> bb/copy-to-EBX mmap-new-segment/imm32 -<span id="L34" class="LineNr">34 </span> 89/copy 1/mod/*+disp8 3/rm32/EBX <span class="CommentedCode"> . </span> <span class="CommentedCode"> . </span> <span class="CommentedCode"> . </span> 0/r32/EAX 4/disp8 <span class="CommentedCode"> . </span> <span class="subxComment"># copy EAX to *(EBX+4)</span> -<span id="L35" class="LineNr">35 </span> <span class="subxComment"># mmap(mmap-new-segment)</span> -<span id="L36" class="LineNr">36 </span> bb/copy-to-EBX mmap-new-segment/imm32 -<span id="L37" class="LineNr">37 </span> b8/copy-to-EAX 0x5a/imm32/mmap -<span id="L38" class="LineNr">38 </span> cd/syscall 0x80/imm8 -<span id="L39" class="LineNr">39 </span> <span class="subxComment"># epilog</span> -<span id="L40" class="LineNr">40 </span> 5b/pop-to-EBX -<span id="L41" class="LineNr">41 </span> 89/copy 3/mod/direct 4/rm32/ESP <span class="CommentedCode"> . </span> <span class="CommentedCode"> . </span> <span class="CommentedCode"> . </span> 5/r32/EBP <span class="CommentedCode"> . </span> <span class="CommentedCode"> . </span> <span class="subxComment"># copy EBP to ESP</span> -<span id="L42" class="LineNr">42 </span> 5d/pop-to-EBP -<span id="L43" class="LineNr">43 </span> c3/return +<span id="L26" class="LineNr">26 </span> <span class="subxS1Comment"># . prolog</span> +<span id="L27" class="LineNr">27 </span> 55/push-EBP +<span id="L28" class="LineNr">28 </span> 89/copy 3/mod/direct 5/rm32/EBP <span class="CommentedCode"> . </span> <span class="CommentedCode"> . </span> <span class="CommentedCode"> . </span> 4/r32/ESP <span class="CommentedCode"> . </span> <span class="CommentedCode"> . </span> <span class="subxComment"># copy ESP to EBP</span> +<span id="L29" class="LineNr">29 </span> 53/push-EBX +<span id="L30" class="LineNr">30 </span> <span class="subxComment"># copy len to mmap-new-segment.len</span> +<span id="L31" class="LineNr">31 </span> <span class="subxComment"># TODO: compute mmap-new-segment+4 before runtime</span> +<span id="L32" class="LineNr">32 </span> 8b/copy 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none <span class="CommentedCode"> . </span> 0/r32/EAX 8/disp8 <span class="CommentedCode"> . </span> <span class="subxComment"># copy *(EBP+8) to EAX</span> +<span id="L33" class="LineNr">33 </span> bb/copy-to-EBX mmap-new-segment/imm32 +<span id="L34" class="LineNr">34 </span> 89/copy 1/mod/*+disp8 3/rm32/EBX <span class="CommentedCode"> . </span> <span class="CommentedCode"> . </span> <span class="CommentedCode"> . </span> 0/r32/EAX 4/disp8 <span class="CommentedCode"> . </span> <span class="subxComment"># copy EAX to *(EBX+4)</span> +<span id="L35" class="LineNr">35 </span> <span class="subxComment"># mmap(mmap-new-segment)</span> +<span id="L36" class="LineNr">36 </span> bb/copy-to-EBX mmap-new-segment/imm32 +<span id="L37" class="LineNr">37 </span> b8/copy-to-EAX 0x5a/imm32/mmap +<span id="L38" class="LineNr">38 </span> cd/syscall 0x80/imm8 +<span id="L39" class="LineNr">39 </span> <span class="subxS1Comment"># . epilog</span> +<span id="L40" class="LineNr">40 </span> 5b/pop-to-EBX +<span id="L41" class="LineNr">41 </span> 89/copy 3/mod/direct 4/rm32/ESP <span class="CommentedCode"> . </span> <span class="CommentedCode"> . </span> <span class="CommentedCode"> . </span> 5/r32/EBP <span class="CommentedCode"> . </span> <span class="CommentedCode"> . </span> <span class="subxComment"># copy EBP to ESP</span> +<span id="L42" class="LineNr">42 </span> 5d/pop-to-EBP +<span id="L43" class="LineNr">43 </span> c3/return <span id="L44" class="LineNr">44 </span> <span id="L45" class="LineNr">45 </span>== data <span id="L46" class="LineNr">46 </span> <span id="L47" class="LineNr">47 </span><span class="subxComment"># various constants used here were found in the Linux sources (search for file mman-common.h)</span> <span id="L48" class="LineNr">48 </span>mmap-new-segment: <span class="subxComment"># type mmap_arg_struct</span> -<span id="L49" class="LineNr">49 </span> <span class="subxComment"># addr</span> -<span id="L50" class="LineNr">50 </span> 00 00 00 00 <span class="subxComment"># null</span> -<span id="L51" class="LineNr">51 </span> <span class="subxComment"># len</span> -<span id="L52" class="LineNr">52 </span> 00 00 00 00 <span class="subxComment"># 0x1000</span> -<span id="L53" class="LineNr">53 </span> <span class="subxComment"># protection flags</span> -<span id="L54" class="LineNr">54 </span> 03 00 00 00 <span class="subxComment"># PROT_READ | PROT_WRITE</span> -<span id="L55" class="LineNr">55 </span> <span class="subxComment"># sharing flags</span> -<span id="L56" class="LineNr">56 </span> 22 00 00 00 <span class="subxComment"># MAP_PRIVATE | MAP_ANONYMOUS</span> -<span id="L57" class="LineNr">57 </span> <span class="subxComment"># fd</span> -<span id="L58" class="LineNr">58 </span> ff ff ff ff <span class="subxH2Comment"># -1 since MAP_ANONYMOUS is specified</span> -<span id="L59" class="LineNr">59 </span> <span class="subxComment"># offset</span> -<span id="L60" class="LineNr">60 </span> 00 00 00 00 <span class="subxComment"># 0 since MAP_ANONYMOUS is specified</span> +<span id="L49" class="LineNr">49 </span> <span class="subxComment"># addr</span> +<span id="L50" class="LineNr">50 </span> 00 00 00 00 <span class="subxComment"># null</span> +<span id="L51" class="LineNr">51 </span> <span class="subxComment"># len</span> +<span id="L52" class="LineNr">52 </span> 00 00 00 00 <span class="subxComment"># 0x1000</span> +<span id="L53" class="LineNr">53 </span> <span class="subxComment"># protection flags</span> +<span id="L54" class="LineNr">54 </span> 03 00 00 00 <span class="subxComment"># PROT_READ | PROT_WRITE</span> +<span id="L55" class="LineNr">55 </span> <span class="subxComment"># sharing flags</span> +<span id="L56" class="LineNr">56 </span> 22 00 00 00 <span class="subxComment"># MAP_PRIVATE | MAP_ANONYMOUS</span> +<span id="L57" class="LineNr">57 </span> <span class="subxComment"># fd</span> +<span id="L58" class="LineNr">58 </span> ff ff ff ff <span class="subxH1Comment"># -1 since MAP_ANONYMOUS is specified</span> +<span id="L59" class="LineNr">59 </span> <span class="subxComment"># offset</span> +<span id="L60" class="LineNr">60 </span> 00 00 00 00 <span class="subxComment"># 0 since MAP_ANONYMOUS is specified</span> <span id="L61" class="LineNr">61 </span> -<span id="L62" class="LineNr">62 </span><span class="subxComment"># vim:nowrap:textwidth=0</span> +<span id="L62" class="LineNr">62 </span><span class="subxS2Comment"># . . vim:nowrap:textwidth=0</span> </pre> </body> </html> |