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Author Commit Date CI Message
Max Filippov ab167710 2022-02-20T16:01:38 Xtensa cleanups and XEA3 support (#677) * xtensa: clean up stack usage in ffi_trampoline call Space for outgoing call arguments reserved in the stack frame of the function ffi_trampoline overlaps register spill overflow area at the top of the frame. In xtensa XEA2 exception architecture the layout of overlapping areas is identical so that even if the ffi_trampoline registers frame gets spilled the memory contents doesn't change. This is not so with the xtensa XEA3 exception architecture, where registers a0 - a7 of a different function are spilled in that location. Reserve spill area for 8 registers to avoid overlapping of the spill area with the outgoing call arguments area in the ffi_trampoline. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> * xtensa: support xtensa XEA3 exception architecture XEA3 requires that 32 bytes of register spill area is reserved in all functions. Fix ffi_cacheflush entry instruction to satisfy this requirement. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> * xtensa: maintain stack alignment xtensa ABI requires stack alignment on 16 byte boundary and passing up to 6 arguments in registers. To simplify stack alignment maintenance fixed amount of stack space is reserved for arguments passed in registers and variable but correctly aligned amount is reserved for the remaining arguments. After copying arguments to the stack and loading registers the fixed part of the stack reservation is freed. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> * xtensa: fix err_bad_abi tests Check ffi_cif::abi value in the ffi_prep_closure_loc and return FFI_BAD_ABI error if it's not one of the supported values. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Lucas Pluvinage 7d3cab79 2018-04-21T00:24:50 xtensa-linux: use cache flush instruction only if it is available (#426)
Gregory Pakosz bd72848c 2017-04-27T13:20:36 Prefix ALIGN macros with FFI_
Anthony Green 20cae32b 2013-01-21T07:07:38 Xtensa support