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Beschreibung
The runtime assembly code includes many functions that are called from outside the runtime and are called with the C ABI. This means the functions first have to save callee-saved registers manually.
For example, see runtime·sigtramp in sys_linux_*.s.
Once after diagnosing a callee-save error, I failed to save all the callee-save registers. This meant months later, @aclements had to go through the same long debugging session. We could make this more robust (and potentially make our assembly a bit easier to read) by adding a CABI text flag, and have the assembler insert code for saving and restoring registers.
cc @ianlancetaylor