kc3-lang/libffi/src/xtensa/ffitarget.h

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• Hash : ab167710
  Author :
  Date : 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>

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• src/xtensa/ffitarget.h

• /* -----------------------------------------------------------------*-C-*-
     ffitarget.h - Copyright (c) 2013 Tensilica, Inc.
     Target configuration macros for XTENSA.
  
     Permission is hereby granted, free of charge, to any person obtaining
     a copy of this software and associated documentation files (the
     ``Software''), to deal in the Software without restriction, including
     without limitation the rights to use, copy, modify, merge, publish,
     distribute, sublicense, and/or sell copies of the Software, and to
     permit persons to whom the Software is furnished to do so, subject to
     the following conditions:
  
     The above copyright notice and this permission notice shall be included
     in all copies or substantial portions of the Software.
  
     THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND,
     EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
     MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
     NONINFRINGEMENT.  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
     HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
     WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
     OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
     DEALINGS IN THE SOFTWARE.
     ----------------------------------------------------------------------- */
  
  #ifndef LIBFFI_TARGET_H
  #define LIBFFI_TARGET_H
  
  #ifndef LIBFFI_H
  #error "Please do not include ffitarget.h directly into your source.  Use ffi.h instead."
  #endif
  
  #ifndef LIBFFI_ASM
  typedef unsigned long	ffi_arg;
  typedef signed long	ffi_sarg;
  
  typedef enum ffi_abi {
    FFI_FIRST_ABI = 0,
    FFI_SYSV,
    FFI_LAST_ABI,
    FFI_DEFAULT_ABI = FFI_SYSV
  } ffi_abi;
  #endif
  
  #define FFI_REGISTER_NARGS	6
  #define XTENSA_STACK_ALIGNMENT	16
  #define FFI_REGISTER_ARGS_SPACE ((FFI_REGISTER_NARGS * 4 + \
  				  XTENSA_STACK_ALIGNMENT - 1) & \
  				  -XTENSA_STACK_ALIGNMENT)
  
  /* ---- Definitions for closures ----------------------------------------- */
  
  #define FFI_CLOSURES 1
  #define FFI_NATIVE_RAW_API 0
  #define FFI_TRAMPOLINE_SIZE 24
  
  #endif
  

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