build(core): export Rust functions' stack sizes

It is useful to find the top-most stack consuming functions: ``` $ make build_firmware $ arm-none-eabi-size -A build/firmware/firmware.elf | grep .stack_sizes .stack_sizes 7523 0 $ cargo install [email protected] $ stack-sizes build/firmware/firmware.elf | grep trezor_lib | sort -k2 -n | tail -n10 0x081c1721 3536 trezor_lib::ui::api::firmware_micropython::new_confirm_properties::h2ab0feebaf154486 0x081c0e7d 3560 trezor_lib::ui::api::firmware_micropython::new_confirm_modify_output::h04465b97d57fafb6 0x081c6161 3688 trezor_lib::ui::api::firmware_micropython::new_show_checklist::he16b109bc4dff398 0x081c4089 4240 trezor_lib::ui::api::firmware_micropython::new_request_pin::h3280c5eff8900a22 0x081be3e1 4960 trezor_lib::ui::api::firmware_micropython::new_confirm_action::h860f874d714ace74 0x081bf545 5096 trezor_lib::ui::api::firmware_micropython::new_confirm_emphasized::h9ade56f5c88001c0 0x081c1ded 5736 trezor_lib::ui::api::firmware_micropython::new_confirm_summary::he2e1274bbc07703e 0x081c7ee9 6760 trezor_lib::ui::api::firmware_micropython::new_show_remaining_shares::h1f67cbfdfeb4c683 0x081c127d 6768 trezor_lib::ui::api::firmware_micropython::new_confirm_more::h107a4be9b5431bb4 0x081c5441 8312 trezor_lib::ui::api::firmware_micropython::new_show_address_details::h352e0b87c58914ce ``` [no changelog]
trezor · Jan 31, 2025 · 2a19b35 · 2a19b35
1 parent a75a9f2
commit 2a19b35
Showing 1 changed file with 6 additions and 0 deletions.
diff --git a/core/SConscript.firmware b/core/SConscript.firmware
@@ -791,6 +791,12 @@ def cargo_build():
         # see https://nnethercote.github.io/perf-book/type-sizes.html#measuring-type-sizes for more details
         env.Append(ENV={'RUSTFLAGS': '-Z print-type-sizes'})
 
+    # Adds an ELF section with Rust functions' stack sizes. See the following links for more details:
+    # - https://doc.rust-lang.org/nightly/unstable-book/compiler-flags/emit-stack-sizes.html
+    # - https://blog.japaric.io/stack-analysis/
+    # - https://github.com/japaric/stack-sizes/
+    env.Append(ENV={'RUSTFLAGS': '-Z emit-stack-sizes'})
+
     bindgen_macros = tools.get_bindgen_defines(env.get("CPPDEFINES"), ALLPATHS)
     build_dir = str(Dir('.').abspath)