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

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• Hash : dd5bd030
  Author :
  Date : 2021-04-07T05:42:10
  

  Fix building for arm windows with mingw toolchains (#631)
  
  * arm: Check _WIN32 instead of _M_ARM or _MSC_VER for detecting windows
  
  This matches what was done for ARM64 in
  c06468fa6674d3783a0edb1d0fae9afc8bc28513.
  
  * arm: Only use armasm source when building with MSVC
  
  When building for windows/arm with clang, the normal gas style .S
  source works fine (if fixed up to support thumb and other windows
  specifics).
  
  This matches what was done for ARM64 in
  c06468fa6674d3783a0edb1d0fae9afc8bc28513.
  
  * arm: Fix sysv.S to work in thumb mode
  
  Align cases in jump tables (adding nop padding to make sure each
  case starts where expected).
  
  Rewrite instructions that add directly to the pc register.
  
  For ffi_closure_ret, factor out a call_epilogue subroutine that
  restores both sp and pc from the stack; the thumb version of ldm
  can't load into the sp register. To avoid excessive ifdeffing, keep
  using call_epilogue in arm mode, but keep the shorter "ldm sp, {sp, pc}"
  epilogue in that case.
  
  * arm: Add win32 version of trampoline to sysv.S
  
  This matches the version of it in sysv_msvc_arm32.S. The calling
  C code expects a specific form of the trampoline on windows; make
  sure these work the same on windows regardless of the form of
  assembly used.
  
  * arm: Avoid optimizing out clearing the thumb bit of ffi_arm_trampoline
  
  We clear the thumb bit of ffi_arm_trampoline with a bitmask before
  memcpying its instructions into closure->tramp.
  
  If the bit isn't cleared, the memcpy of the trampoline function
  copies the wrong instructions.
  
  If the ffi_arm_trampoline symbol is declared as an array of int,
  the compiler can assume that it is aligned to a 4 byte boundary
  and the bitmask operation is a no-op, and optimize it out.
  
  See https://godbolt.org/z/dE3jE1WTz; both Clang and GCC optimize
  out the bitmask as it is, while MSVC doesn't. By declaring the
  trampoline as an array of unsigned char, the bitmask works as
  intended.

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• src/arm/ffitarget.h

• /* -----------------------------------------------------------------*-C-*-
     ffitarget.h - Copyright (c) 2012  Anthony Green
                   Copyright (c) 2010  CodeSourcery
                   Copyright (c) 1996-2003  Red Hat, Inc.
  
     Target configuration macros for ARM.
  
     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_VFP,
    FFI_LAST_ABI,
  #if defined(__ARM_PCS_VFP) || defined(_WIN32)
    FFI_DEFAULT_ABI = FFI_VFP,
  #else
    FFI_DEFAULT_ABI = FFI_SYSV,
  #endif
  } ffi_abi;
  #endif
  
  #define FFI_EXTRA_CIF_FIELDS			\
    int vfp_used;					\
    unsigned short vfp_reg_free, vfp_nargs;	\
    signed char vfp_args[16]			\
  
  #define FFI_TARGET_SPECIFIC_VARIADIC
  #ifndef _WIN32
  #define FFI_TARGET_HAS_COMPLEX_TYPE
  #endif
  
  /* ---- Definitions for closures ----------------------------------------- */
  
  #define FFI_CLOSURES 1
  #define FFI_GO_CLOSURES 1
  #define FFI_NATIVE_RAW_API 0
  
  #if defined (FFI_EXEC_TRAMPOLINE_TABLE) && FFI_EXEC_TRAMPOLINE_TABLE
  
  #ifdef __MACH__
  #define FFI_TRAMPOLINE_SIZE 12
  #define FFI_TRAMPOLINE_CLOSURE_OFFSET 8
  #else
  #error "No trampoline table implementation"
  #endif
  
  #else
  #ifdef _WIN32
  #define FFI_TRAMPOLINE_SIZE 16
  #define FFI_TRAMPOLINE_CLOSURE_FUNCTION 12
  #else
  #define FFI_TRAMPOLINE_SIZE 12
  #endif
  #define FFI_TRAMPOLINE_CLOSURE_OFFSET FFI_TRAMPOLINE_SIZE
  #endif
  
  #endif
  

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