Adjust frame IP in backtraces relative to image base for SGX target

Author: mzohreva

library/std/src/backtrace.rs

@@ -327,6 +327,11 @@ impl Backtrace {
         let _lock = lock();
         let mut frames = Vec::new();
         let mut actual_start = None;
+        #[cfg(all(target_vendor = "fortanix", target_env = "sgx"))]
+        {
+            let image_base = crate::os::fortanix_sgx::mem::image_base();
+            backtrace_rs::set_image_base(crate::ptr::from_exposed_addr_mut(image_base as _));
+        }
         unsafe {
             backtrace_rs::trace_unsynchronized(|frame| {
                 frames.push(BacktraceFrame {

library/std/src/sys_common/backtrace.rs

@@ -64,6 +64,11 @@ unsafe fn _print_fmt(fmt: &mut fmt::Formatter<'_>, print_fmt: PrintFmt) -> fmt::
     let mut first_omit = true;
     // Start immediately if we're not using a short backtrace.
     let mut start = print_fmt != PrintFmt::Short;
+    #[cfg(all(target_vendor = "fortanix", target_env = "sgx"))]
+    {
+        let image_base = crate::os::fortanix_sgx::mem::image_base();
+        backtrace_rs::set_image_base(crate::ptr::from_exposed_addr_mut(image_base as _));
+    }
     backtrace_rs::trace_unsynchronized(|frame| {
         if print_fmt == PrintFmt::Short && idx > MAX_NB_FRAMES {
             return false;