Commits on Nov 1, 2022

1. rust: make compiler-builtin stubs non-global …

   Currently we define a number of stubs for compiler-builtin intrinsics
   that compiled libcore generates. The defined stubs are weak so they will
   not conflict with genuine implementation of these intrinsics, but their
   effect is global and will cause non-libcore code that accidently
   generate these intrinsics calls compile and bug on runtime.
   
   Instead of defining a stub that can affect all code, this patch uses
   objcopy's `--redefine-sym` flag to redirect these calls (from libcore
   only) to a prefixed version (e.g. redirect `__multi3` to `__rust_multi3`),
   so we can define panciking stubs that are only visible to libcore.
   
   Signed-off-by: Gary Guo <gary@garyguo.net>

   

   nbdd0121 committed Nov 1, 2022
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2. rust: replace __aeabi_uldivmod stub with actual implementation …

   Rust's libcore genuinely needs 64-bit division for formatting, but we
   can't change these to use kernel's division routine; so `__aeabi_uldivmod`
   calls will be generated.
   
   Instead of redirecting these calls to a panicking stub, forward them to
   `div64_u64_rem`.
   
   Signed-off-by: Gary Guo <gary@garyguo.net>

   

   nbdd0121 committed Nov 1, 2022
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