flake.nix

@@ -126,7 +126,7 @@
           lockFile = src/Cargo.lock;
           outputHashes = {
               "tar-no-std-0.1.8" = "sha256-xm17108v4smXOqxdLvHl9CxTCJslmeogjm4Y87IXFuM=";
-              "fatfs-0.4.0" = "sha256-P7IgvhwTPXtNhcyv8cFqwO2UdaEcCGJY7UBG6+yBFSg=";
+              "nalgebra-0.32.6" = "sha256-L/YudkVOtfGYoNQKBD7LMk/sMYgRDzPDdpGL5rO7G2I=";
             };
         };
 

src/libksupport/src/eh_rust.rs

@@ -1,149 +0,0 @@
-// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
-// file at the top-level directory of this distribution and at
-// http://rust-lang.org/COPYRIGHT.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
-
-// This is the Rust personality function, adapted for use in ARTIQ. We never actually panic
-// from Rust or recover from Rust exceptions (there's nothing to catch the panics), but we
-// need a personality function to step back through Rust frames in order to make a backtrace.
-//
-// By design, this personality function is only ever called in the search phase, although
-// to keep things simple and close to upstream, it is not modified
-use unwind as uw;
-use libc::{c_int, uintptr_t};
-
-use dwarf::eh::{self, EHAction, EHContext};
-
-// Register ids were lifted from LLVM's TargetLowering::getExceptionPointerRegister()
-// and TargetLowering::getExceptionSelectorRegister() for each architecture,
-// then mapped to DWARF register numbers via register definition tables
-// (typically <arch>RegisterInfo.td, search for "DwarfRegNum").
-// See also http://llvm.org/docs/WritingAnLLVMBackend.html#defining-a-register.
-
-#[cfg(target_arch = "x86")]
-const UNWIND_DATA_REG: (i32, i32) = (0, 2); // EAX, EDX
-
-#[cfg(target_arch = "x86_64")]
-const UNWIND_DATA_REG: (i32, i32) = (0, 1); // RAX, RDX
-
-#[cfg(any(target_arch = "riscv32"))]
-const UNWIND_DATA_REG: (i32, i32) = (10, 11); // X10, X11
-
-#[cfg(any(target_arch = "arm", target_arch = "aarch64"))]
-const UNWIND_DATA_REG: (i32, i32) = (0, 1); // R0, R1 / X0, X1
-
-// The following code is based on GCC's C and C++ personality routines.  For reference, see:
-// https://github.com/gcc-mirror/gcc/blob/master/libstdc++-v3/libsupc++/eh_personality.cc
-// https://github.com/gcc-mirror/gcc/blob/trunk/libgcc/unwind-c.c
-#[lang = "eh_personality"]
-#[no_mangle]
-unsafe extern "C" fn rust_eh_personality(
-    state: uw::_Unwind_State,
-    exception_object: *mut uw::_Unwind_Exception,
-    context: *mut uw::_Unwind_Context,
-) -> uw::_Unwind_Reason_Code {
-    let state = state as c_int;
-    let action = state & uw::_US_ACTION_MASK as c_int;
-    let search_phase = if action == uw::_US_VIRTUAL_UNWIND_FRAME as c_int {
-        // Backtraces on ARM will call the personality routine with
-        // state == _US_VIRTUAL_UNWIND_FRAME | _US_FORCE_UNWIND. In those cases
-        // we want to continue unwinding the stack, otherwise all our backtraces
-        // would end at __rust_try
-        if state & uw::_US_FORCE_UNWIND as c_int != 0 {
-            return continue_unwind(exception_object, context);
-        }
-        true
-    } else if action == uw::_US_UNWIND_FRAME_STARTING as c_int {
-        false
-    } else if action == uw::_US_UNWIND_FRAME_RESUME as c_int {
-        return continue_unwind(exception_object, context);
-    } else {
-        return uw::_URC_FAILURE;
-    };
-
-    // The DWARF unwinder assumes that _Unwind_Context holds things like the function
-    // and LSDA pointers, however ARM EHABI places them into the exception object.
-    // To preserve signatures of functions like _Unwind_GetLanguageSpecificData(), which
-    // take only the context pointer, GCC personality routines stash a pointer to
-    // exception_object in the context, using location reserved for ARM's
-    // "scratch register" (r12).
-    uw::_Unwind_SetGR(context, uw::UNWIND_POINTER_REG, exception_object as uw::_Unwind_Ptr);
-    // ...A more principled approach would be to provide the full definition of ARM's
-    // _Unwind_Context in our libunwind bindings and fetch the required data from there
-    // directly, bypassing DWARF compatibility functions.
-
-    let eh_action = match find_eh_action(context) {
-        Ok(action) => action,
-        Err(_) => return uw::_URC_FAILURE,
-    };
-    if search_phase {
-        match eh_action {
-            EHAction::None | EHAction::Cleanup(_) => {
-                return continue_unwind(exception_object, context);
-            }
-            EHAction::Catch(_) => {
-                // EHABI requires the personality routine to update the
-                // SP value in the barrier cache of the exception object.
-                (*exception_object).private[5] =
-                    uw::_Unwind_GetGR(context, uw::UNWIND_SP_REG);
-                return uw::_URC_HANDLER_FOUND;
-            }
-            EHAction::Terminate => return uw::_URC_FAILURE,
-        }
-    } else {
-        match eh_action {
-            EHAction::None => return continue_unwind(exception_object, context),
-            EHAction::Cleanup(lpad) | EHAction::Catch(lpad) => {
-                uw::_Unwind_SetGR(
-                    context,
-                    UNWIND_DATA_REG.0,
-                    exception_object as uw::_Unwind_Ptr,
-                );
-                uw::_Unwind_SetGR(context, UNWIND_DATA_REG.1, 0);
-                uw::_Unwind_SetIP(context, lpad);
-                return uw::_URC_INSTALL_CONTEXT;
-            }
-            EHAction::Terminate => return uw::_URC_FAILURE,
-        }
-    }
-
-    // On ARM EHABI the personality routine is responsible for actually
-    // unwinding a single stack frame before returning (ARM EHABI Sec. 6.1).
-    unsafe fn continue_unwind(
-        exception_object: *mut uw::_Unwind_Exception,
-        context: *mut uw::_Unwind_Context,
-    ) -> uw::_Unwind_Reason_Code {
-        if __gnu_unwind_frame(exception_object, context) == uw::_URC_NO_REASON {
-            uw::_URC_CONTINUE_UNWIND
-        } else {
-            uw::_URC_FAILURE
-        }
-    }
-    // defined in libgcc
-    extern "C" {
-        fn __gnu_unwind_frame(
-            exception_object: *mut uw::_Unwind_Exception,
-            context: *mut uw::_Unwind_Context,
-        ) -> uw::_Unwind_Reason_Code;
-    }
-}
-
-unsafe fn find_eh_action(context: *mut uw::_Unwind_Context) -> Result<EHAction, ()> {
-    let lsda = uw::_Unwind_GetLanguageSpecificData(context) as *const u8;
-    let mut ip_before_instr: c_int = 0;
-    let ip = uw::_Unwind_GetIPInfo(context, &mut ip_before_instr);
-    let eh_context = EHContext {
-        // The return address points 1 byte past the call instruction,
-        // which could be in the next IP range in LSDA range table.
-        ip: if ip_before_instr != 0 { ip } else { ip - 1 },
-        func_start: uw::_Unwind_GetRegionStart(context),
-        get_text_start: &|| uw::_Unwind_GetTextRelBase(context),
-        get_data_start: &|| uw::_Unwind_GetDataRelBase(context),
-    };
-    dwarf::eh::find_eh_action(lsda, &eh_context, false,0)
-}

src/libksupport/src/lib.rs

@@ -1,7 +1,6 @@
 #![no_std]
 #![feature(c_variadic)]
 #![feature(const_btree_len)]
-#![feature(lang_items)]
 #![feature(generic_const_exprs)]
 #![feature(naked_functions)]
 #![feature(asm)]
@@ -22,7 +21,6 @@ pub use pl::csr::rtio_core;
 use void::Void;
 
 pub mod eh_artiq;
-pub mod eh_rust;
 pub mod i2c;
 pub mod irq;
 pub mod kernel;