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Registers used for exception handling on Linux/m68k?

From John Paul Adrian Glaubitz@21:1/5 to All on Tue Sep 29 17:30:03 2020

Hello!

I'm looking for an information regarding exception handling on Linux/m68k, in particular
I need to know what registers are used by the ABI in order to implement the functions
"getExceptionPointerRegister" and "getExceptionSelectorRegister" in the M680x0 backend
in LLVM [1], [2].

I looked into the GCC source code to find the corresponding parts but I could only find
the macros prefixed with "EH_" [4] which I didn't fully understand.

Can any of the experienced GCC/m68k folks tell me which registers in [5] I need to use?

Adrian

[1] https://github.com/M680x0/M680x0-mono-repo/issues/15
[2] https://github.com/llvm/llvm-project/blob/master/llvm/lib/Target/Sparc/SparcISelLowering.h#L107
[3] https://github.com/llvm/llvm-project/blob/ee34d9b210cb5a6d14fe069e2e2ae75b0548dba9/llvm/lib/Target/Sparc/SparcRegisterInfo.td#L151
[4] https://github.com/gcc-mirror/gcc/blob/master/gcc/config/m68k/m68k.h#L741 [5] https://github.com/M680x0/M680x0-mono-repo/blob/master/llvm/lib/Target/M680x0/M680x0RegisterInfo.td

--
.''`. John Paul Adrian Glaubitz
: :' : Debian Developer - [email protected]
`. `' Freie Universitaet Berlin - [email protected]
`- GPG: 62FF 8A75 84E0 2956 9546 0006 7426 3B37 F5B5 F913

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