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index.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>RISC-V 二进制开发在线工具</title>
</head>
<body>
<div>
<p>欢迎使用页表二进制查看工具！</p>
</div>
<div>
<p>输入根页表gdb命令的输出：</p>
<p>
<textarea id="root-gdb" rows="4" cols="60" oninput="onGdbPageTableInput(this)">
(gdb) x/16g 0x80420000
0x80420000: 0x0000000000000000 0x0000000000000000
0x80420010: 0x0000000020108401 0x0000000000000000
</textarea>
</p>
<p>可选地，输入子页表gdb命令的输出：</p>
<p>
<textarea id="child-gdb" rows="8" cols="60" oninput="onGdbPageTableInput(this)">
(gdb) x/16g 0x80421000
0x80421000: 0x000000002000000f 0x000000002008000f
0x80421010: 0x0000000020109001 0x0000000000000000
</textarea>
</p>
<pre id="gdb-page-table-info">
（请输入）
</pre>
<p>
请先输入以下gdb命令，查看satp的值。（仅支持64位目标系统）
<pre>info register satp</pre>
然后，粘贴输出到这个文本框。
</p>
<p>
<textarea rows="3" cols="60" oninput="onGdbSatpInput(this)">
(gdb) info register satp
satp 0x8000000000080420 -9223372036854250464
</textarea>
</p>
<p>
根据输出，当前的页表模式为<a id="mode">（请输入）</a>，
空间编号是<a id="asid">（请输入）</a>，
基地址页号是<a id="ppn">（请输入）</a>。
<br>
你需要填入用于查询根页表的gdb命令是：<pre id="gdb-get-page">（请输入）</pre>
</p>
</div>
<div>
版权所有©️2021 无相之风战队 <a href="https://qf.rs/">返回主站</a>
</div>
<script>
function onGdbSatpInput(obj) {
var string = obj.value;
string.trim().split('\n').forEach(function(line, idx) {
if(!line.trim().startsWith("satp")) {
return;
}
var arr = line.trim().split(/[ ]+/);
if (arr[1] === void 0){
return;
}
var satp_value = BigInt(arr[1]);
var mode = satp_value >> BigInt(60);
var asid = (satp_value >> BigInt(44)) & BigInt((2**16) - 1);
var ppn = satp_value & BigInt((2**44) - 1);
document.getElementById("mode").innerText = mode;
document.getElementById("asid").innerText = asid;
document.getElementById("ppn").innerText = "0x"+ppn.toString(16);
document.getElementById("gdb-get-page").innerText = "x/16gx 0x"+ppn.toString(16)+"000";
})
}
function onGdbPageTableInput(obj) {
var string = document.getElementById("root-gdb").value;
var current_base = BigInt(0);
var out_string = "";
var levels = new Map();
var bases = new Map();
string.trim().split('\n').forEach(function(line, idx) {
if(line.trim().startsWith("(gdb)")) {
var arr = line.trim().split(/[ ]+/);
current_base = BigInt(arr[2]);
// alert(current_base.toString(16));
}
if(!line.trim().startsWith("0x")) {
return;
}
var arr = line.trim().split(/[ ]+/);
var begin = arr[0].substr(0,arr[0].length-1);
var line_addr_begin = BigInt(begin);
var line_addr_shift = line_addr_begin - current_base;
var pte_index = line_addr_shift / BigInt(8);
line.trim().split(/[ ]+/).forEach(function(value, idx) {
if(idx == 0) {
return;
}
// alert(BigInt(value))
if(BigInt(value) == BigInt(0)) {
return;
}
var idx_cur_value = BigInt(idx - 1) + pte_index;
var pte = BigInt(value);
var ppn = "0x" + (pte >> BigInt(10)).toString(16);
var vpn_start = "0x" + (idx_cur_value * BigInt(0x40000)).toString(16);
var vpn_end = "0x" + ((idx_cur_value + BigInt(1)) * BigInt(0x40000) - BigInt(1)).toString(16);
var pa = (pte >> BigInt(10)) * BigInt(0x1000);
levels.set(pa, 0); // 第0等级
var vpn_start_int = idx_cur_value * BigInt(0x40000);
bases.set(pa, vpn_start_int);
var flags = getFlagsStringFromPte(pte);
out_string = out_string +
"虚拟页 " + vpn_start + " ~ " + vpn_end + " → 物理页 " + ppn + "，标签 "+flags+"\n";
})
})
var current_level = BigInt(0);
document.getElementById("child-gdb").value.trim().split('\n').forEach(function(line, idx) {
if(line.trim().startsWith("(gdb)")) {
var arr = line.trim().split(/[ ]+/);
current_base = BigInt(arr[2]);
if (levels.get(current_base) === void 0){
current_level = BigInt(0);
} else {
// alert(levels.get(current_base));
current_level = BigInt(levels.get(current_base)) + BigInt(1);
}
// out_string = out_string + "Base = "+current_base.toString(16)+" Level = "+current_level +"\n";
// alert(current_base.toString(16));
}
if(!line.trim().startsWith("0x")) {
return;
}
var arr = line.trim().split(/[ ]+/);
var begin = arr[0].substr(0,arr[0].length-1);
var line_addr_begin = BigInt(begin);
var line_addr_shift = line_addr_begin - current_base;
var pte_index = line_addr_shift / BigInt(8);
line.trim().split(/[ ]+/).forEach(function(value, idx) {
if(idx == 0) {
return;
}
// alert(BigInt(value))
if(BigInt(value) == BigInt(0)) {
return;
}
var idx_cur_value = BigInt(idx - 1) + pte_index;
var pte = BigInt(value);
var ppn = "0x" + (pte >> BigInt(10)).toString(16);
var level_mul = BigInt(0x40000);
if(current_level == BigInt(1)) {
level_mul = BigInt(0x200);
} else {
level_mul = BigInt(1);
}
var cur_base = BigInt(0);
if(bases.get(current_base) == void 0) {
} else {
cur_base = bases.get(current_base);
}
// out_string = out_string + "base = " + cur_base.toString(16) + "\n";
var vpn_start = "0x" + (cur_base + idx_cur_value * level_mul).toString(16);
var vpn_end = "0x" + (cur_base + (idx_cur_value + BigInt(1)) * level_mul - BigInt(1)).toString(16);
var pa = (pte >> BigInt(10)) * BigInt(0x1000);
levels.set(pa, current_level + BigInt(1)); // 第0等级
var va = cur_base + idx_cur_value * level_mul;
if(pa != va * BigInt(0x1000)) {
bases.set(pa, va);
}
// out_string = out_string + "idx_cur_value = "+idx_cur_value + " mul = "+level_mul + " base = " + cur_base.toString(16) + "\n";
// out_string = out_string + "pa = " + pa.toString(16) + " va = " + va.toString(16) + "\n";
var flags = getFlagsStringFromPte(pte);
out_string = out_string +
"虚拟页 " + vpn_start + " ~ " + vpn_end + " → 物理页 " + ppn + "，标签 "+flags+"\n";
})
})
document.getElementById("gdb-page-table-info").innerText = out_string;
}
function getFlagsStringFromPte(pte) {
var flags = "";
if((pte & BigInt(0x1)) != BigInt(0)) {
flags = flags + "V";
} else {
flags = flags + "!V";
}
if((pte & BigInt(0x2)) != BigInt(0)) {
flags = flags + "R";
}
if((pte & BigInt(0x4)) != BigInt(0)) {
flags = flags + "W";
}
if((pte & BigInt(0x8)) != BigInt(0)) {
flags = flags + "X";
}
if((pte & BigInt(0x10)) != BigInt(0)) {
flags = flags + "U";
}
if((pte & BigInt(0x20)) != BigInt(0)) {
flags = flags + "G";
}
if((pte & BigInt(0x40)) != BigInt(0)) {
flags = flags + "A";
}
if((pte & BigInt(0x80)) != BigInt(0)) {
flags = flags + "D";
}
if((pte & BigInt(0x2)) == BigInt(0)
&& (pte & BigInt(0x4)) == BigInt(0)
&& (pte & BigInt(0x8)) == BigInt(0)) {
flags = flags + "（指向子页表）";
}
return flags;
}
</script>
</body>
</html>