From 67f4ec5782f41224d2d6ff865f0ddc2ef24c7231 Mon Sep 17 00:00:00 2001
From: mwojcik <mw@m-labs.hk>
Date: Wed, 1 Sep 2021 15:05:08 +0200
Subject: [PATCH] satman: satisfied libunwind's demands, compiles

---
 default.nix            | 10 ++++++----
 src/satman/Cargo.toml  |  1 +
 src/satman/src/main.rs | 25 +++++++++++++++++++++++++
 3 files changed, 32 insertions(+), 4 deletions(-)

diff --git a/default.nix b/default.nix
index 6b80837..0e7a29d 100644
--- a/default.nix
+++ b/default.nix
@@ -36,12 +36,14 @@ let
         make TARGET=${target} GWARGS="${if json == null then "-V ${variant}" else json}" ${if variant == "satellite" then "satman" else "runtime"}
       '';
 
+      # there's probably a better way to go around it
       installPhase = ''
         mkdir -p $out $out/nix-support
-        cp ../build/runtime.bin $out/runtime.bin
-        cp ../build/firmware/armv7-none-eabihf/release/runtime $out/runtime.elf
-        echo file binary-dist $out/runtime.bin >> $out/nix-support/hydra-build-products
-        echo file binary-dist $out/runtime.elf >> $out/nix-support/hydra-build-products
+        export FWTYPE=${if variant == "satellite" then "satman" else "runtime"}
+        cp ../build/$FWTYPE.bin $out/$FWTYPE.bin
+        cp ../build/firmware/armv7-none-eabihf/release/$FWTYPE $out/$FWTYPE.elf
+        echo file binary-dist $out/$FWTYPE.bin >> $out/nix-support/hydra-build-products
+        echo file binary-dist $out/$FWTYPE.elf >> $out/nix-support/hydra-build-products
       '';
 
       doCheck = false;
diff --git a/src/satman/Cargo.toml b/src/satman/Cargo.toml
index 3b2b34d..863dee0 100644
--- a/src/satman/Cargo.toml
+++ b/src/satman/Cargo.toml
@@ -25,3 +25,4 @@ libconfig = { git = "https://git.m-labs.hk/M-Labs/zynq-rs.git", features = ["ipv
 
 libboard_artiq = { path = "../libboard_artiq" }
 unwind = { path = "../libunwind" }
+libc = { path = "../libc" }
\ No newline at end of file
diff --git a/src/satman/src/main.rs b/src/satman/src/main.rs
index ac656fb..7967411 100644
--- a/src/satman/src/main.rs
+++ b/src/satman/src/main.rs
@@ -626,3 +626,28 @@ pub fn panic_fmt(info: &core::panic::PanicInfo) -> ! {
 
     loop {}
 }
+
+// linker symbols
+extern "C" {
+    static __text_start: u32;
+    static __text_end: u32;
+    static __exidx_start: u32;
+    static __exidx_end: u32;
+}
+
+
+/// Called by llvm_libunwind
+#[no_mangle]
+extern fn dl_unwind_find_exidx(pc: *const u32, len_ptr: *mut u32) -> *const u32 {
+    let length;
+    let start: *const u32;
+    unsafe {
+        // lifted off runtime kernel/core1.rs
+        // and removed kernel image from there
+        // hope it works!
+        length = (&__exidx_end as *const u32).offset_from(&__exidx_start) as u32;
+        start = &__exidx_start;
+        *len_ptr = length;
+    }
+    start
+}