c694bb3f43
Rust reimplementation of the xenia Xbox 360 emulator targeting reverse- engineering and preservation, initially scoped to Project Sylpheed. Includes: - XEX2 loader (LZX decompression, AES decryption, PE parsing) - XISO / XGD2 disc image VFS - PPC interpreter with 200+ opcodes and VMX128 decoding - Static analyzer: functions, cross-references, labels, asm + SQLite output - HLE kernel covering the xboxkrnl/xam subset used by Sylpheed init - Debugger with in-memory and SQLite-backed execution tracing - `xenia-rs` CLI with extract/dis/exec commands that produce cumulative, superset SQLite databases and opt-in instruction/import/branch traces Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
99 lines
2.9 KiB
Rust
99 lines
2.9 KiB
Rust
use crate::MemoryError;
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/// Reserve a contiguous virtual address region without committing physical pages.
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#[cfg(unix)]
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pub fn reserve_address_space(size: usize) -> Result<*mut u8, MemoryError> {
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unsafe {
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let ptr = libc::mmap(
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std::ptr::null_mut(),
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size,
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libc::PROT_NONE,
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libc::MAP_PRIVATE | libc::MAP_ANONYMOUS | libc::MAP_NORESERVE,
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-1,
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0,
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);
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if ptr == libc::MAP_FAILED {
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Err(MemoryError::AllocationFailed(format!(
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"mmap failed for {} bytes: {}",
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size,
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std::io::Error::last_os_error()
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)))
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} else {
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Ok(ptr as *mut u8)
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}
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}
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}
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/// Commit (make accessible) a region within a previously reserved address space.
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#[cfg(unix)]
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pub fn commit_memory(ptr: *mut u8, size: usize) -> Result<(), MemoryError> {
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unsafe {
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let result = libc::mprotect(ptr as *mut libc::c_void, size, libc::PROT_READ | libc::PROT_WRITE);
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if result != 0 {
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Err(MemoryError::AllocationFailed(format!(
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"mprotect failed for {} bytes: {}",
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size,
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std::io::Error::last_os_error()
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)))
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} else {
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Ok(())
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}
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}
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}
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/// Release a previously reserved address space.
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#[cfg(unix)]
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pub unsafe fn release_address_space(ptr: *mut u8, size: usize) {
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unsafe { libc::munmap(ptr as *mut libc::c_void, size); }
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}
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#[cfg(windows)]
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pub fn reserve_address_space(size: usize) -> Result<*mut u8, MemoryError> {
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unsafe {
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let ptr = windows_sys::Win32::System::Memory::VirtualAlloc(
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std::ptr::null_mut(),
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size,
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windows_sys::Win32::System::Memory::MEM_RESERVE,
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windows_sys::Win32::System::Memory::PAGE_NOACCESS,
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);
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if ptr.is_null() {
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Err(MemoryError::AllocationFailed(format!(
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"VirtualAlloc reserve failed for {} bytes",
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size,
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)))
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} else {
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Ok(ptr as *mut u8)
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}
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}
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}
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#[cfg(windows)]
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pub fn commit_memory(ptr: *mut u8, size: usize) -> Result<(), MemoryError> {
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unsafe {
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let result = windows_sys::Win32::System::Memory::VirtualAlloc(
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ptr as *mut _,
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size,
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windows_sys::Win32::System::Memory::MEM_COMMIT,
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windows_sys::Win32::System::Memory::PAGE_READWRITE,
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);
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if result.is_null() {
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Err(MemoryError::AllocationFailed(format!(
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"VirtualAlloc commit failed for {} bytes",
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size,
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)))
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} else {
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Ok(())
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}
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}
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}
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#[cfg(windows)]
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pub unsafe fn release_address_space(ptr: *mut u8, size: usize) {
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let _ = size;
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windows_sys::Win32::System::Memory::VirtualFree(
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ptr as *mut _,
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0,
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windows_sys::Win32::System::Memory::MEM_RELEASE,
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);
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}
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