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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,95 @@ | ||
| <script> | ||
| /** | ||
| * This is an interactive element specifically created | ||
| * for the moving-data-x64 article. | ||
| * It showcases how the "mov ptr [src] dest" x86-64 | ||
| * assembly syntax works, wiht a live example | ||
| * | ||
| */ | ||
| import GdbEmbed from './GdbEmbed.svelte' | ||
| let data = [0, 0, 0, 0, 0xca, 0xfe, 0xba, 0xbe]; | ||
| let startAddress = 0; | ||
| let imm = "" | ||
| let error = "" | ||
| let immBytes = [] | ||
| $: { | ||
| let [r, err] = convertImmediateValue(imm); | ||
| immBytes = r | ||
| error = err | ||
| } | ||
| function bigintToBytesLE(bigIntNumber) { | ||
| let bytes = []; | ||
| for (let i = 0; i < 8; i++) { | ||
| bytes.push(Number(bigIntNumber & BigInt(0xff))); | ||
| bigIntNumber = bigIntNumber >> BigInt(8); | ||
| } | ||
| return bytes; | ||
| } | ||
| function convertImmediateValue(input) { | ||
| // Define the maximum value for a 64-bit unsigned integer | ||
| const MAX_64BIT = BigInt("0xFFFFFFFFFFFFFFFF"); | ||
| let result = [0, ""]; | ||
| if(input.length == 0){ | ||
| result[1] = " ● missing number" | ||
| } | ||
| try { | ||
| let value = BigInt(input); | ||
| if (value <= MAX_64BIT) { | ||
| result[0] = bigintToBytesLE(value); | ||
| } else { | ||
| result[1] = " ● The provided number is too large"; | ||
| } | ||
| } catch (e) { | ||
| result[1] = " ● Invalid input format, not a number"; | ||
| } | ||
| return result; | ||
| } | ||
| let start_addr = 0x20 | ||
| function init(){ | ||
| data = Array(14*8).fill(0) | ||
| let text = "Example text" | ||
| text.split("").forEach((c,i) => data[i] = c.charCodeAt(0)) | ||
| imm = "0xfeedc0de12345678" | ||
| error = "" | ||
| } | ||
| init(); | ||
| function run(){ | ||
| console.log({imm, immBytes}) | ||
| for(let i=0; i< immBytes.length; i++) | ||
| data[start_addr+i] = immBytes[i]; | ||
| data = data; | ||
| } | ||
| </script> | ||
|
|
||
| <GdbEmbed | ||
| on:runClick={run} | ||
| on:resetClick={init} | ||
| registersPanel={false} | ||
| {data} | ||
| showAscii={true} | ||
| {startAddress} | ||
| > | ||
| mov rbx, <span class="token number"> | ||
| <input type="text" bind:value={imm} /> | ||
| </span> <span class:error={error.length}> {error}</span> | ||
| mov rax, <span class="token number">0x20</span> | ||
| mov qword ptr [rax], rbx | ||
| </GdbEmbed> | ||
|
|
||
| <style> | ||
| .error { | ||
| background-color: rgb(105,51,61); | ||
| color: #ffbcbc; | ||
| } | ||
| </style> | ||
|
|
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