Add FreeBSD support (#215)

* fix(gum): add freebsd as target_os

* fix(gum): add freebsd for gum_*_parse_ucontext

* fix(gum): add freebsd for frida_g_get_*_dir functions

Author: saruman9

frida-gum/src/backtracer.rs

@@ -12,15 +12,22 @@ use {core::mem::MaybeUninit, frida_gum_sys as gum_sys};
 
 // The following function is not exposed through the `frida-gum.h` header, so we don't have an
 // auto-generated binding for it. This may change in a future version.
-#[cfg(not(target_os = "windows"))]
 extern "C" {
     // On some platforms `ucontext` contains a u128 which does not have a defined ABI. In this case,
     // we disable the error as we assume the behaviour is correct (all other platforms are unaffected).
+    #[cfg(target_os = "linux")]
     #[allow(improper_ctypes)]
     fn gum_linux_parse_ucontext(
         context: *const libc::ucontext_t,
         cpu_context: *mut gum_sys::GumCpuContext,
     );
+
+    #[cfg(target_os = "freebsd")]
+    #[allow(improper_ctypes)]
+    fn gum_freebsd_parse_ucontext(
+        context: *const libc::ucontext_t,
+        cpu_context: *mut gum_sys::GumCpuContext,
+    );
 }
 
 pub struct Backtracer;
@@ -84,24 +91,36 @@ impl Backtracer {
 
     /// Generate an accurate backtrace as a list of return addresses for the supplied signal
     /// context.
-    #[cfg(not(target_os = "windows"))]
+    #[cfg(any(target_os = "linux", target_os = "freebsd"))]
     pub fn accurate_with_signal_context(context: &libc::ucontext_t) -> Vec<usize> {
         let mut cpu_context = MaybeUninit::<gum_sys::GumCpuContext>::uninit();
 
         unsafe {
+            #[cfg(target_os = "linux")]
             gum_linux_parse_ucontext(context as *const libc::ucontext_t, cpu_context.as_mut_ptr());
+            #[cfg(target_os = "freebsd")]
+            gum_freebsd_parse_ucontext(
+                context as *const libc::ucontext_t,
+                cpu_context.as_mut_ptr(),
+            );
             Self::accurate_with_context(&cpu_context.assume_init())
         }
     }
 
     /// Generate a fuzzy backtrace as a list of return addresses for the supplied signal
     /// context.
-    #[cfg(not(target_os = "windows"))]
+    #[cfg(any(target_os = "linux", target_os = "freebsd"))]
     pub fn fuzzy_with_signal_context(context: &libc::ucontext_t) -> Vec<usize> {
         let mut cpu_context = MaybeUninit::<gum_sys::GumCpuContext>::uninit();
 
         unsafe {
+            #[cfg(target_os = "linux")]
             gum_linux_parse_ucontext(context as *const libc::ucontext_t, cpu_context.as_mut_ptr());
+            #[cfg(target_os = "freebsd")]
+            gum_freebsd_parse_ucontext(
+                context as *const libc::ucontext_t,
+                cpu_context.as_mut_ptr(),
+            );
             Self::fuzzy_with_context(&cpu_context.assume_init())
         }
     }

frida-gum/src/process.rs

@@ -20,14 +20,14 @@ use alloc::{string::String, string::ToString, vec::Vec};
 use cstr_core::CString;
 use frida_gum_sys::GumThreadFlags_GUM_THREAD_FLAGS_ALL;
 
-#[cfg(target_os = "linux")]
+#[cfg(any(target_os = "linux", target_os = "freebsd"))]
 extern "C" {
     pub fn _frida_g_get_home_dir() -> *const c_char;
     pub fn _frida_g_get_current_dir() -> *const c_char;
     pub fn _frida_g_get_tmp_dir() -> *const c_char;
 }
 
-#[cfg(not(target_os = "linux"))]
+#[cfg(not(any(target_os = "linux", target_os = "freebsd")))]
 extern "C" {
     pub fn g_get_home_dir() -> *const c_char;
     pub fn g_get_current_dir() -> *const c_char;
@@ -130,9 +130,9 @@ impl<'a> Process<'a> {
     /// Returns a string specifying the filesystem path to the current working directory
     pub fn current_dir(&self) -> String {
         unsafe {
-            #[cfg(target_os = "linux")]
+            #[cfg(any(target_os = "linux", target_os = "freebsd"))]
             let dir = _frida_g_get_current_dir();
-            #[cfg(not(target_os = "linux"))]
+            #[cfg(not(any(target_os = "linux", target_os = "freebsd")))]
             let dir = g_get_current_dir();
 
             CStr::from_ptr(dir).to_string_lossy().to_string()
@@ -142,9 +142,9 @@ impl<'a> Process<'a> {
     /// Returns a string specifying the filesystem path to the directory to use for temporary files
     pub fn tmp_dir(&self) -> String {
         unsafe {
-            #[cfg(target_os = "linux")]
+            #[cfg(any(target_os = "linux", target_os = "freebsd"))]
             let dir = _frida_g_get_tmp_dir();
-            #[cfg(not(target_os = "linux"))]
+            #[cfg(not(any(target_os = "linux", target_os = "freebsd")))]
             let dir = g_get_tmp_dir();
 
             CStr::from_ptr(dir).to_string_lossy().to_string()
@@ -154,9 +154,9 @@ impl<'a> Process<'a> {
     /// Returns a string specifying the filesystem path to the current user’s home directory
     pub fn home_dir(&self) -> String {
         unsafe {
-            #[cfg(target_os = "linux")]
+            #[cfg(any(target_os = "linux", target_os = "freebsd"))]
             let dir = _frida_g_get_home_dir();
-            #[cfg(not(target_os = "linux"))]
+            #[cfg(not(any(target_os = "linux", target_os = "freebsd")))]
             let dir = g_get_home_dir();
 
             CStr::from_ptr(dir).to_string_lossy().to_string()

frida-gum/src/script/context.rs

@@ -3,15 +3,15 @@ use {
     frida_gum_sys::{GMainContext, GMainLoop},
 };
 
-#[cfg(any(target_os = "linux", target_os = "android"))]
+#[cfg(any(target_os = "linux", target_os = "android", target_os = "freebsd"))]
 use frida_gum_sys::{
     _frida_g_main_context_iteration as g_main_context_iteration,
     _frida_g_main_context_pending as g_main_context_pending,
     _frida_g_main_context_push_thread_default as g_main_context_push_thread_default,
     _frida_g_main_loop_new as g_main_loop_new,
 };
 
-#[cfg(not(any(target_os = "linux", target_os = "android")))]
+#[cfg(not(any(target_os = "linux", target_os = "android", target_os = "freebsd")))]
 use frida_gum_sys::{
     g_main_context_iteration, g_main_context_pending, g_main_context_push_thread_default,
     g_main_loop_new,

frida-gum/src/script/data.rs

@@ -13,10 +13,10 @@ use {
 };
 
 /* glib exports are aliased in frida devkit for Linux and Android */
-#[cfg(any(target_os = "linux", target_os = "android"))]
+#[cfg(any(target_os = "linux", target_os = "android", target_os = "freebsd"))]
 use frida_gum_sys::_frida_g_bytes_get_data as g_bytes_get_data;
 
-#[cfg(not(any(target_os = "linux", target_os = "android")))]
+#[cfg(not(any(target_os = "linux", target_os = "android", target_os = "freebsd")))]
 use frida_gum_sys::g_bytes_get_data;
 
 pub(crate) struct ScriptData<F>