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objdump.cpp
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212 lines (173 loc) · 4.19 KB
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// objdump injection utility for Linux perf tools.
// Profiling JIT generated code is always problematic.
// On Linux, perf annotation tools do not automatically
// disassemble runtime-generated code.
// However, it's possible to override objdump utility
// which is used to disassemeble executables.
// This tool intercepts objdump commands, and if they
// correspond to JIT generated objects in RPCS3,
// it should be able to correctly disassemble them.
// Usage:
// 1. Make sure ~/.cache/rpcs3/ASMJIT directory exists.
// 2. Build this utility, for example:
// g++-11 objdump.cpp -o objdump
// 3. Run perf, for example:
// perf record -b -p `pgrep rpcs3`
// 4. Specify --objdump override, for example:
// perf report --objdump=./objdump --gtk
#include <cstring>
#include <cstdio>
#include <cstdint>
#include <unistd.h>
#include <sys/file.h>
#include <sys/mman.h>
#include <string>
#include <vector>
#include <charconv>
#include <string_view>
std::string to_hex(std::uint64_t value, bool prfx = true)
{
char buf[20]{}, *ptr = buf + 19;
do *--ptr = "0123456789abcdef"[value % 16], value /= 16; while (value);
if (!prfx) return ptr;
*--ptr = 'x';
*--ptr = '0';
return ptr;
}
int main(int argc, char* argv[])
{
std::string home;
if (const char* d = ::getenv("XDG_CACHE_HOME"))
home = d;
else if (const char* d = ::getenv("XDG_CONFIG_HOME"))
home = d;
else if (const char* d = ::getenv("HOME"))
home = d, home += "/.cache";
// Get cache path
home += "/rpcs3/ASMJIT/";
// Get objects
int fd = open((home + ".objects").c_str(), O_RDONLY);
if (fd < 0)
return 1;
// Map 4GiB (full size)
const auto data = mmap(nullptr, 0x10000'0000, PROT_READ, MAP_SHARED, fd, 0);
struct entry
{
std::uint64_t addr;
std::uint32_t size;
std::uint32_t off;
};
// Index part (precedes actual data)
const auto index = static_cast<const entry*>(data);
const entry* found = nullptr;
std::string out_file;
std::vector<std::string> args;
for (int i = 0; i < argc; i++)
{
// Replace args
std::string arg = argv[i];
if (std::uintptr_t(data) != -1 && arg.find("--start-address=0x") == 0)
{
// Decode address and try to find the object
std::uint64_t addr = -1;
std::from_chars(arg.data() + ("--start-address=0x"sv).size(), arg.data() + arg.size(), addr, 16);
for (int j = 0; j < 0x100'0000; j++)
{
if (index[j].addr == 0)
{
break;
}
if (index[j].addr == addr)
{
found = index + j;
break;
}
}
if (found)
{
// Extract object into a new file (read file name from the mapped memory)
const char* name = static_cast<char*>(data) + found->off + found->size;
if (name[0])
{
out_file = home + name;
}
else
{
out_file = "/tmp/rpcs3.objdump." + std::to_string(getpid());
unlink(out_file.c_str());
}
const int fd2 = open(out_file.c_str(), O_WRONLY | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
if (fd2 > 0)
{
// Don't overwrite if exists
write(fd2, static_cast<char*>(data) + found->off, found->size);
close(fd2);
}
args.emplace_back("--adjust-vma=" + to_hex(addr));
continue;
}
}
if (found && arg.find("--stop-address=0x") == 0)
{
continue;
}
if (found && arg == "-d")
{
arg = "-D";
}
if (arg == "-l")
{
arg = "-Mintel,x86-64";
}
args.emplace_back(std::move(arg));
}
if (found)
{
args.pop_back();
args.emplace_back("-b");
args.emplace_back("binary");
args.emplace_back("-m");
args.emplace_back("i386:x86-64");
args.emplace_back(std::move(out_file));
}
args[0] = "/usr/bin/objdump";
std::vector<char*> new_argv;
for (auto& arg : args)
{
new_argv.push_back(arg.data());
}
new_argv.push_back(nullptr);
if (found)
{
int fds[2];
pipe(fds);
if (fork() > 0)
{
close(fds[1]);
char c = 0;
std::string buf;
while (read(fds[0], &c, 1) != 0)
{
if (c)
{
buf += c;
if (c == '\n')
{
write(STDOUT_FILENO, buf.data(), buf.size());
buf.clear();
}
}
c = 0;
}
return 0;
}
else
{
while ((dup2(fds[1], STDOUT_FILENO) == -1) && (errno == EINTR)) {}
close(fds[1]);
close(fds[0]);
// Fallthrough
}
}
return execv(new_argv[0], new_argv.data());
}