Description: Add support for sunway
Author: Miao Changwei <miaochangwei@uniontech.com>
Last-Update: 2022-04-07

---
 Makefile.am                                   |   2 +
 config.guess                                  |   4 +
 config.sub                                    |   2 +-
 configure.host                                |   7 +
 src/sw64/ffi.c                                | 517 ++++++++++++++++++
 src/sw64/ffitarget.h                          |  58 ++
 src/sw64/internal.h                           |  23 +
 src/sw64/sysv.S                               | 283 ++++++++++
 .../libffi.complex/cls_complex_va_float.c     |   4 +-
 9 files changed, 897 insertions(+), 3 deletions(-)
 create mode 100644 src/sw64/ffi.c
 create mode 100644 src/sw64/ffitarget.h
 create mode 100644 src/sw64/internal.h
 create mode 100644 src/sw64/sysv.S

diff --git a/Makefile.am b/Makefile.am
index a4a4887..747d129 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -62,6 +62,7 @@ noinst_HEADERS = src/aarch64/ffitarget.h src/aarch64/internal.h		\
 	src/s390/ffitarget.h src/s390/internal.h src/sh/ffitarget.h	\
 	src/sh64/ffitarget.h src/sparc/ffitarget.h			\
 	src/sparc/internal.h src/tile/ffitarget.h src/vax/ffitarget.h	\
+	src/sw64/ffitarget.h src/sw64/internal.h			\
 	src/x86/ffitarget.h src/x86/internal.h src/x86/internal64.h	\
 	src/x86/asmnames.h src/xtensa/ffitarget.h src/dlmalloc.c	\
 	src/kvx/ffitarget.h src/kvx/asm.h				\
@@ -91,6 +92,7 @@ EXTRA_libffi_la_SOURCES = src/aarch64/ffi.c src/aarch64/sysv.S		\
 	src/s390/sysv.S src/sh/ffi.c src/sh/sysv.S src/sh64/ffi.c	\
 	src/sh64/sysv.S src/sparc/ffi.c src/sparc/ffi64.c		\
 	src/sparc/v8.S src/sparc/v9.S src/tile/ffi.c src/tile/tile.S	\
+	src/sw64/ffi.c src/sw64/sysv.S					\
 	src/vax/ffi.c src/vax/elfbsd.S src/x86/ffi.c src/x86/sysv.S	\
 	src/x86/ffiw64.c src/x86/win64.S src/x86/ffi64.c		\
 	src/x86/unix64.S src/x86/sysv_intel.S src/x86/win64_intel.S	\
diff --git a/config.guess b/config.guess
index 7f76b62..fe6f8bc 100644
--- a/config.guess
+++ b/config.guess
@@ -990,6 +990,10 @@ EOF
 	if test "$?" = 0 ; then LIBC=gnulibc1 ; fi
 	GUESS=$UNAME_MACHINE-unknown-linux-$LIBC
 	;;
+    sw_64:Linux:*:* | sw64:Linux:*:*)
+       UNAME_MACHINE=sw_64
+       echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
+       exit ;;
     arc:Linux:*:* | arceb:Linux:*:* | arc32:Linux:*:* | arc64:Linux:*:*)
 	GUESS=$UNAME_MACHINE-unknown-linux-$LIBC
 	;;
diff --git a/config.sub b/config.sub
index dba16e8..c0d9565 100644
--- a/config.sub
+++ b/config.sub
@@ -1266,7 +1266,7 @@ case $cpu-$vendor in
 			| sparc | sparc64 | sparc64b | sparc64v | sparc86x | sparclet \
 			| sparclite \
 			| sparcv8 | sparcv9 | sparcv9b | sparcv9v | sv1 | sx* \
-			| spu \
+			| spu | sw_64 \
 			| tahoe \
 			| thumbv7* \
 			| tic30 | tic4x | tic54x | tic55x | tic6x | tic80 \
diff --git a/configure.host b/configure.host
index f23716f..0304d5a 100644
--- a/configure.host
+++ b/configure.host
@@ -254,6 +254,13 @@ case "${host}" in
 	SOURCES="ffi.c ffi64.c v8.S v9.S"
 	;;
 
+  sw_64*-*-* | sw64*-*-*)
+	TARGET=SW64; TARGETDIR=sw64;
+	# Support 128-bit long double, changeable via command-line switch.
+	HAVE_LONG_DOUBLE='defined(__LONG_DOUBLE_128__)'
+	SOURCES="ffi.c sysv.S"
+	;;
+
   tile*-*)
         TARGET=TILE; TARGETDIR=tile
 	SOURCES="ffi.c tile.S"
diff --git a/src/sw64/ffi.c b/src/sw64/ffi.c
new file mode 100644
index 0000000..5c26580
--- /dev/null
+++ b/src/sw64/ffi.c
@@ -0,0 +1,517 @@
+/* -----------------------------------------------------------------------
+   ffi.c - Copyright (c) 2012  Anthony Green
+	   Copyright (c) 1998, 2001, 2007, 2008  Red Hat, Inc.
+	   Copyright (c) 2021, UnionTech Software Technology Co., Ltd.
+
+   Sunway Foreign Function Interface
+
+   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.
+   ----------------------------------------------------------------------- */
+
+#include <ffi.h>
+#include <ffi_common.h>
+#include <stdlib.h>
+#include "internal.h"
+
+/* Force FFI_TYPE_LONGDOUBLE to be different than FFI_TYPE_DOUBLE;
+   all further uses in this file will refer to the 128-bit type.  */
+#if defined(__LONG_DOUBLE_128__)
+# if FFI_TYPE_LONGDOUBLE != 4
+#  error FFI_TYPE_LONGDOUBLE out of date
+# endif
+#else
+# undef FFI_TYPE_LONGDOUBLE
+# define FFI_TYPE_LONGDOUBLE 4
+#endif
+
+extern void ffi_call_SYSV(void *stack, void *frame, unsigned flags,
+			 void *raddr, void (*fn)(void), void *closure)
+	FFI_HIDDEN;
+extern void ffi_closure_SYSV(void) FFI_HIDDEN;
+extern void ffi_go_closure_SYSV(void) FFI_HIDDEN;
+
+/* Promote a float value to its in-register double representation.
+   Unlike actually casting to double, this does not trap on NaN.  */
+static inline UINT64 lds(void *ptr)
+{
+  UINT64 ret;
+  asm("flds %0,%1" : "=f"(ret) : "m"(*(UINT32 *)ptr));
+  return ret;
+}
+
+/* And the reverse.  */
+static inline void sts(void *ptr, UINT64 val)
+{
+  asm("fsts %1,%0" : "=m"(*(UINT32 *)ptr) : "f"(val));
+}
+
+ffi_status FFI_HIDDEN
+ffi_prep_cif_machdep(ffi_cif *cif)
+{
+  size_t bytes = 0;
+  int flags, i, avn;
+  ffi_type *rtype, *itype;
+
+  if (cif->abi != FFI_SYSV)
+    return FFI_BAD_ABI;
+
+  /* Compute the size of the argument area.  */
+  for (i = 0, avn = cif->nargs; i < avn; i++)
+    {
+      itype = cif->arg_types[i];
+      switch (itype->type)
+	{
+	case FFI_TYPE_INT:
+	case FFI_TYPE_SINT8:
+	case FFI_TYPE_UINT8:
+	case FFI_TYPE_SINT16:
+	case FFI_TYPE_UINT16:
+	case FFI_TYPE_SINT32:
+	case FFI_TYPE_UINT32:
+	case FFI_TYPE_SINT64:
+	case FFI_TYPE_UINT64:
+	case FFI_TYPE_POINTER:
+	case FFI_TYPE_FLOAT:
+	case FFI_TYPE_DOUBLE:
+	case FFI_TYPE_LONGDOUBLE:
+	  /* All take one 8 byte slot.  */
+	  bytes += 8;
+	  break;
+
+	case FFI_TYPE_VOID:
+	case FFI_TYPE_STRUCT:
+	  /* Passed by value in N slots.  */
+	  bytes += FFI_ALIGN(itype->size, FFI_SIZEOF_ARG);
+	  break;
+
+	case FFI_TYPE_COMPLEX:
+	  /* _Complex long double passed by reference; others in 2 slots.  */
+	  if (itype->elements[0]->type == FFI_TYPE_LONGDOUBLE)
+	    bytes += 8;
+	  else
+	    bytes += 16;
+	  break;
+
+	default:
+	  abort();
+	}
+    }
+
+  /* Set the return type flag */
+  rtype = cif->rtype;
+  switch (rtype->type)
+    {
+    case FFI_TYPE_VOID:
+      flags = SW64_FLAGS(SW64_ST_VOID, SW64_LD_VOID);
+      break;
+    case FFI_TYPE_INT:
+    case FFI_TYPE_UINT32:
+    case FFI_TYPE_SINT32:
+      flags = SW64_FLAGS(SW64_ST_INT, SW64_LD_INT32);
+      break;
+    case FFI_TYPE_FLOAT:
+      flags = SW64_FLAGS(SW64_ST_FLOAT, SW64_LD_FLOAT);
+      break;
+    case FFI_TYPE_DOUBLE:
+      flags = SW64_FLAGS(SW64_ST_DOUBLE, SW64_LD_DOUBLE);
+      break;
+    case FFI_TYPE_UINT8:
+      flags = SW64_FLAGS(SW64_ST_INT, SW64_LD_UINT8);
+      break;
+    case FFI_TYPE_SINT8:
+      flags = SW64_FLAGS(SW64_ST_INT, SW64_LD_SINT8);
+      break;
+    case FFI_TYPE_UINT16:
+      flags = SW64_FLAGS(SW64_ST_INT, SW64_LD_UINT16);
+      break;
+    case FFI_TYPE_SINT16:
+      flags = SW64_FLAGS(SW64_ST_INT, SW64_LD_SINT16);
+      break;
+    case FFI_TYPE_UINT64:
+    case FFI_TYPE_SINT64:
+    case FFI_TYPE_POINTER:
+      flags = SW64_FLAGS(SW64_ST_INT, SW64_LD_INT64);
+      break;
+    case FFI_TYPE_LONGDOUBLE:
+    case FFI_TYPE_STRUCT:
+      /* Passed in memory, with a hidden pointer.  */
+      flags = SW64_RET_IN_MEM;
+      break;
+    case FFI_TYPE_COMPLEX:
+      itype = rtype->elements[0];
+      switch (itype->type)
+	{
+	case FFI_TYPE_FLOAT:
+	  flags = SW64_FLAGS(SW64_ST_CPLXF, SW64_LD_CPLXF);
+	  break;
+	case FFI_TYPE_DOUBLE:
+	  flags = SW64_FLAGS(SW64_ST_CPLXD, SW64_LD_CPLXD);
+	  break;
+	default:
+	  if (rtype->size <= 8)
+	    flags = SW64_FLAGS(SW64_ST_INT, SW64_LD_INT64);
+	  else
+	    flags = SW64_RET_IN_MEM;
+	  break;
+	}
+      break;
+    default:
+      abort();
+    }
+  cif->flags = flags;
+
+  /* Include the hidden structure pointer in args requirement.  */
+  if (flags == SW64_RET_IN_MEM)
+    bytes += 8;
+  /* Minimum size is 6 slots, so that ffi_call_SYSV can pop them.  */
+  if (bytes < 6*8)
+    bytes = 6*8;
+  cif->bytes = bytes;
+
+  return FFI_OK;
+}
+
+static unsigned long
+extend_basic_type(void *valp, int type, int argn)
+{
+  switch (type)
+    {
+    case FFI_TYPE_SINT8:
+      return *(SINT8 *)valp;
+    case FFI_TYPE_UINT8:
+      return *(UINT8 *)valp;
+    case FFI_TYPE_SINT16:
+      return *(SINT16 *)valp;
+    case FFI_TYPE_UINT16:
+      return *(UINT16 *)valp;
+
+    case FFI_TYPE_FLOAT:
+      if (argn < 6)
+	return lds(valp);
+      /* FALLTHRU */
+
+    case FFI_TYPE_INT:
+    case FFI_TYPE_SINT32:
+    case FFI_TYPE_UINT32:
+      /* Note that unsigned 32-bit quantities are sign extended.  */
+      return *(SINT32 *)valp;
+
+    case FFI_TYPE_SINT64:
+    case FFI_TYPE_UINT64:
+    case FFI_TYPE_POINTER:
+    case FFI_TYPE_DOUBLE:
+      return *(UINT64 *)valp;
+
+    default:
+      abort();
+    }
+}
+
+static void
+ffi_call_int (ffi_cif *cif, void (*fn)(void), void *rvalue,
+	      void **avalue, void *closure)
+{
+  unsigned long *argp;
+  long i, avn, argn, flags = cif->flags;
+  ffi_type **arg_types;
+  void *frame;
+
+  /* If the return value is a struct and we don't have a return
+     value address then we need to make one.  */
+  if (rvalue == NULL && flags == SW64_RET_IN_MEM)
+    rvalue = alloca(cif->rtype->size);
+
+  /* Allocate the space for the arguments, plus 4 words of temp
+     space for ffi_call_SYSV.  */
+  argp = frame = alloca(cif->bytes + 4*FFI_SIZEOF_ARG);
+  frame += cif->bytes;
+
+  argn = 0;
+  if (flags == SW64_RET_IN_MEM)
+    argp[argn++] = (unsigned long)rvalue;
+
+  avn = cif->nargs;
+  arg_types = cif->arg_types;
+
+  for (i = 0, avn = cif->nargs; i < avn; i++)
+    {
+      ffi_type *ty = arg_types[i];
+      void *valp = avalue[i];
+      int type = ty->type;
+      size_t size;
+
+      switch (type)
+	{
+	case FFI_TYPE_INT:
+	case FFI_TYPE_SINT8:
+	case FFI_TYPE_UINT8:
+	case FFI_TYPE_SINT16:
+	case FFI_TYPE_UINT16:
+	case FFI_TYPE_SINT32:
+	case FFI_TYPE_UINT32:
+	case FFI_TYPE_SINT64:
+	case FFI_TYPE_UINT64:
+	case FFI_TYPE_POINTER:
+	case FFI_TYPE_FLOAT:
+	case FFI_TYPE_DOUBLE:
+	  argp[argn] = extend_basic_type(valp, type, argn);
+	  argn++;
+	  break;
+
+	case FFI_TYPE_LONGDOUBLE:
+	by_reference:
+	  /* Note that 128-bit long double is passed by reference.  */
+	  argp[argn++] = (unsigned long)valp;
+	  break;
+
+	case FFI_TYPE_VOID:
+	case FFI_TYPE_STRUCT:
+	  size = ty->size;
+	  memcpy(argp + argn, valp, size);
+	  argn += FFI_ALIGN(size, FFI_SIZEOF_ARG) / FFI_SIZEOF_ARG;
+	  break;
+
+	case FFI_TYPE_COMPLEX:
+	  type = ty->elements[0]->type;
+	  if (type == FFI_TYPE_LONGDOUBLE)
+	    goto by_reference;
+
+	  /* Most complex types passed as two separate arguments.  */
+	  size = ty->elements[0]->size;
+	  argp[argn] = extend_basic_type(valp, type, argn);
+	  argp[argn + 1] = extend_basic_type(valp + size, type, argn + 1);
+	  argn += 2;
+	  break;
+
+	default:
+	  abort();
+	}
+    }
+
+  flags = (flags >> SW64_ST_SHIFT) & 0xff;
+  ffi_call_SYSV(argp, frame, flags, rvalue, fn, closure);
+}
+
+void
+ffi_call (ffi_cif *cif, void (*fn)(void), void *rvalue, void **avalue)
+{
+  ffi_call_int(cif, fn, rvalue, avalue, NULL);
+}
+
+void
+ffi_call_go (ffi_cif *cif, void (*fn)(void), void *rvalue,
+	     void **avalue, void *closure)
+{
+  ffi_call_int(cif, fn, rvalue, avalue, closure);
+}
+
+ffi_status
+ffi_prep_closure_loc (ffi_closure* closure,
+		      ffi_cif* cif,
+		      void (*fun)(ffi_cif*, void*, void**, void*),
+		      void *user_data,
+		      void *codeloc)
+{
+  unsigned int *tramp;
+
+  if (cif->abi != FFI_SYSV)
+    return FFI_BAD_ABI;
+
+  tramp = (unsigned int *) &closure->tramp[0];
+  tramp[0] = 0x43fb0741;	/* mov $27,$1		*/
+  tramp[1] = 0x8f7b0010;	/* ldl $27,16($27)	*/
+  tramp[2] = 0x0ffb0000;	/* jmp $31,($27),0	*/
+  tramp[3] = 0x43ff075f;	/* nop			*/
+  *(void **) &tramp[4] = ffi_closure_SYSV;
+
+  closure->cif = cif;
+  closure->fun = fun;
+  closure->user_data = user_data;
+
+  /* Flush the Icache. 0x86 is HMC_imb <asm/hmcall.h>.  */
+  asm volatile ("sys_call 0x86" : : : "memory");
+
+  return FFI_OK;
+}
+
+ffi_status
+ffi_prep_go_closure (ffi_go_closure* closure,
+		     ffi_cif* cif,
+		     void (*fun)(ffi_cif*, void*, void**, void*))
+{
+  if (cif->abi != FFI_SYSV)
+    return FFI_BAD_ABI;
+
+  closure->tramp = (void *)ffi_go_closure_SYSV;
+  closure->cif = cif;
+  closure->fun = fun;
+
+  return FFI_OK;
+}
+
+long FFI_HIDDEN
+ffi_closure_SYSV_inner (ffi_cif *cif,
+		       void (*fun)(ffi_cif*, void*, void**, void*),
+		       void *user_data,
+		       void *rvalue, unsigned long *argp)
+{
+  void **avalue;
+  ffi_type **arg_types;
+  long i, avn, argn, flags;
+
+  avalue = alloca(cif->nargs * sizeof(void *));
+  flags = cif->flags;
+  argn = 0;
+
+  /* Copy the caller's structure return address to that the closure
+     returns the data directly to the caller.  */
+  if (flags == SW64_RET_IN_MEM)
+    {
+      rvalue = (void *) argp[0];
+      argn = 1;
+    }
+
+  arg_types = cif->arg_types;
+
+  /* Grab the addresses of the arguments from the stack frame.  */
+  for (i = 0, avn = cif->nargs; i < avn; i++)
+    {
+      ffi_type *ty = arg_types[i];
+      int type = ty->type;
+      void *valp = &argp[argn];
+      size_t size;
+
+      switch (type)
+	{
+	case FFI_TYPE_INT:
+	case FFI_TYPE_SINT8:
+	case FFI_TYPE_UINT8:
+	case FFI_TYPE_SINT16:
+	case FFI_TYPE_UINT16:
+	case FFI_TYPE_SINT32:
+	case FFI_TYPE_UINT32:
+	case FFI_TYPE_SINT64:
+	case FFI_TYPE_UINT64:
+	case FFI_TYPE_POINTER:
+	  argn += 1;
+	  break;
+
+	case FFI_TYPE_VOID:
+	case FFI_TYPE_STRUCT:
+	  size = ty->size;
+	  argn += FFI_ALIGN(size, FFI_SIZEOF_ARG) / FFI_SIZEOF_ARG;
+	  break;
+
+	case FFI_TYPE_FLOAT:
+	  /* Floats coming from registers need conversion from double
+	     back to float format.  */
+	  if (argn < 6)
+	    {
+	      valp = &argp[argn - 6];
+	      sts(valp, argp[argn - 6]);
+	    }
+	  argn += 1;
+	  break;
+
+	case FFI_TYPE_DOUBLE:
+	  if (argn < 6)
+	    valp = &argp[argn - 6];
+	  argn += 1;
+	  break;
+
+	case FFI_TYPE_LONGDOUBLE:
+	by_reference:
+	  /* 128-bit long double is passed by reference.  */
+	  valp = (void *)argp[argn];
+	  argn += 1;
+	  break;
+
+	case FFI_TYPE_COMPLEX:
+	  type = ty->elements[0]->type;
+	  switch (type)
+	    {
+	    case FFI_TYPE_SINT64:
+	    case FFI_TYPE_UINT64:
+	      /* Passed as separate arguments, but they wind up sequential.  */
+	      break;
+
+	    case FFI_TYPE_INT:
+	    case FFI_TYPE_SINT8:
+	    case FFI_TYPE_UINT8:
+	    case FFI_TYPE_SINT16:
+	    case FFI_TYPE_UINT16:
+	    case FFI_TYPE_SINT32:
+	    case FFI_TYPE_UINT32:
+	      /* Passed as separate arguments.  Disjoint, but there's room
+		 enough in one slot to hold the pair.  */
+	      size = ty->elements[0]->size;
+	      memcpy(valp + size, valp + 8, size);
+	      break;
+
+	    case FFI_TYPE_FLOAT:
+	      /* Passed as separate arguments.  Disjoint, and each piece
+		 may need conversion back to float.  */
+	      if (argn < 6)
+		{
+		  valp = &argp[argn - 6];
+		  sts(valp, argp[argn - 6]);
+		}
+	      if (argn + 1 < 6)
+		sts(valp + 4, argp[argn + 1 - 6]);
+	      else
+		*(UINT32 *)(valp + 4) = argp[argn + 1];
+	      break;
+
+	    case FFI_TYPE_DOUBLE:
+	      /* Passed as separate arguments.  Only disjoint if one part
+		 is in fp regs and the other is on the stack.  */
+	      if (argn < 5)
+		valp = &argp[argn - 6];
+	      else if (argn == 5)
+		{
+		  valp = alloca(16);
+		  ((UINT64 *)valp)[0] = argp[5 - 6];
+		  ((UINT64 *)valp)[1] = argp[6];
+		}
+	      break;
+
+	    case FFI_TYPE_LONGDOUBLE:
+	      goto by_reference;
+
+	    default:
+	      abort();
+	    }
+	  argn += 2;
+	  break;
+
+	default:
+	  abort ();
+	}
+
+      avalue[i] = valp;
+    }
+
+  /* Invoke the closure.  */
+  fun (cif, rvalue, avalue, user_data);
+
+  /* Tell ffi_closure_SYSV how to perform return type promotions.  */
+  return (flags >> SW64_LD_SHIFT) & 0xff;
+}
diff --git a/src/sw64/ffitarget.h b/src/sw64/ffitarget.h
new file mode 100644
index 0000000..ae50a54
--- /dev/null
+++ b/src/sw64/ffitarget.h
@@ -0,0 +1,58 @@
+/* -----------------------------------------------------------------*-C-*-
+   ffitarget.h - Copyright (c) 2012  Anthony Green
+                 Copyright (c) 1996-2003  Red Hat, Inc.
+                 Copyright (c) 2021  UnionTech Software Technology Co., Ltd.
+   Target configuration macros for Sunway.
+
+   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_TARGET_SPECIFIC_STACK_SPACE_ALLOCATION
+#define FFI_TARGET_HAS_COMPLEX_TYPE
+
+/* ---- Definitions for closures ----------------------------------------- */
+
+#define FFI_CLOSURES 1
+#define FFI_GO_CLOSURES 1
+#define FFI_TRAMPOLINE_SIZE 24
+#define FFI_NATIVE_RAW_API 0
+
+#endif
diff --git a/src/sw64/internal.h b/src/sw64/internal.h
new file mode 100644
index 0000000..7a7492b
--- /dev/null
+++ b/src/sw64/internal.h
@@ -0,0 +1,23 @@
+#define SW64_ST_VOID	0
+#define SW64_ST_INT	1
+#define SW64_ST_FLOAT	2
+#define SW64_ST_DOUBLE	3
+#define SW64_ST_CPLXF	4
+#define SW64_ST_CPLXD	5
+
+#define SW64_LD_VOID	0
+#define SW64_LD_INT64	1
+#define SW64_LD_INT32	2
+#define SW64_LD_UINT16	3
+#define SW64_LD_SINT16	4
+#define SW64_LD_UINT8	5
+#define SW64_LD_SINT8	6
+#define SW64_LD_FLOAT	7
+#define SW64_LD_DOUBLE	8
+#define SW64_LD_CPLXF	9
+#define SW64_LD_CPLXD	10
+
+#define SW64_ST_SHIFT		0
+#define SW64_LD_SHIFT		8
+#define SW64_RET_IN_MEM	0x10000
+#define SW64_FLAGS(S, L)	(((L) << SW64_LD_SHIFT) | (S))
diff --git a/src/sw64/sysv.S b/src/sw64/sysv.S
new file mode 100644
index 0000000..4568584
--- /dev/null
+++ b/src/sw64/sysv.S
@@ -0,0 +1,283 @@
+/* -----------------------------------------------------------------------
+   sysv.S - Copyright (c) 1998, 2001, 2007, 2008, 2011, 2014 Red Hat
+            Copyright (c) 2021, UnionTech Software Technology Co., Ltd.
+
+   Sunway/SYSV Foreign Function Interface
+
+   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.
+   ----------------------------------------------------------------------- */
+
+#define LIBFFI_ASM
+#include <fficonfig.h>
+#include <ffi.h>
+#include <ffi_cfi.h>
+#include "internal.h"
+
+	.arch sw6
+	.text
+
+/* Aid in building a direct addressed jump table, 4 insns per entry.  */
+.macro E index
+	.align	4
+	.org	99b + \index * 16
+.endm
+
+/* ffi_call_SYSV (void *stack, void *frame, unsigned flags,
+		 void *raddr, void (*fnaddr)(void), void *closure)
+
+   Bit o trickiness here -- FRAME is the base of the stack frame
+   for this function.  This has been allocated by ffi_call.  We also
+   deallocate some of the stack that has been alloca'd.  */
+
+	.align	4
+	.globl	ffi_call_SYSV
+	.ent	ffi_call_SYSV
+	FFI_HIDDEN(ffi_call_SYSV)
+
+ffi_call_SYSV:
+	cfi_startproc
+	cfi_def_cfa($17, 32)
+	mov	$16, $30
+	stl	$26, 0($17)
+	stl	$15, 8($17)
+	mov	$17, $15
+	.prologue 0
+	cfi_def_cfa_register($15)
+	cfi_rel_offset($26, 0)
+	cfi_rel_offset($15, 8)
+
+	stl	$18, 16($17)		# save flags into frame
+	stl	$19, 24($17)		# save rvalue into frame
+	mov	$20, $27		# fn into place for call
+	mov	$21, $1			# closure into static chain
+
+	# Load up all of the (potential) argument registers.
+	ldl	$16, 0($30)
+	fldd    $f16, 0($30)
+	fldd    $f17, 8($30)
+	ldl	$17, 8($30)
+	fldd	$f18, 16($30)
+	ldl	$18, 16($30)
+	fldd	$f19, 24($30)
+	ldl	$19, 24($30)
+	fldd	$f20, 32($30)
+	ldl	$20, 32($30)
+	fldd	$f21, 40($30)
+	ldl	$21, 40($30)
+
+	# Deallocate the register argument area.
+	ldi	$30, 48($30)
+
+	call	$26, ($27), 0
+0:
+	ldih	$29, 0($26)		!gpdisp!1
+	ldl	$2, 24($15)		# reload rvalue
+	ldi	$29, 0($29)		!gpdisp!1
+	ldl	$3, 16($15)		# reload flags
+	ldi	$1, 99f-0b($26)
+	ldl	$26, 0($15)
+	ldl	$15, 8($15)
+	cfi_restore($26)
+	cfi_restore($15)
+	cfi_def_cfa($sp, 0)
+	seleq	$2, SW64_ST_VOID, $3, $3	# mash null rvalue to void
+	addl	$3, $3, $3
+	s8addl	$3, $1, $1		# 99f + stcode * 16
+	jmp	$31, ($1), $st_int
+
+	.align	4
+99:
+E SW64_ST_VOID
+	ret
+E SW64_ST_INT
+$st_int:
+	stl	$0, 0($2)
+	ret
+E SW64_ST_FLOAT
+	fsts	$f0, 0($2)
+	ret
+E SW64_ST_DOUBLE
+	fstd	$f0, 0($2)
+	ret
+E SW64_ST_CPLXF
+	fsts	$f0, 0($2)
+	fsts	$f1, 4($2)
+	ret
+E SW64_ST_CPLXD
+	fstd	$f0, 0($2)
+	fstd	$f1, 8($2)
+	ret
+
+	cfi_endproc
+	.end	ffi_call_SYSV
+
+/* ffi_closure_SYSV(...)
+
+   Receives the closure argument in $1.   */
+
+#define CLOSURE_FS	(16*8)
+
+	.align	4
+	.globl	ffi_go_closure_SYSV
+	.ent	ffi_go_closure_SYSV
+	FFI_HIDDEN(ffi_go_closure_SYSV)
+
+ffi_go_closure_SYSV:
+	cfi_startproc
+	ldgp	$29, 0($27)
+	subl	$30, CLOSURE_FS, $30
+	cfi_adjust_cfa_offset(CLOSURE_FS)
+	stl	$26, 0($30)
+	.prologue 1
+	cfi_rel_offset($26, 0)
+
+	stl	$16, 10*8($30)
+	stl	$17, 11*8($30)
+	stl	$18, 12*8($30)
+
+	ldl	$16, 8($1)			# load cif
+	ldl	$17, 16($1)			# load fun
+	mov	$1, $18				# closure is user_data
+	br	$do_closure
+
+	cfi_endproc
+	.end	ffi_go_closure_SYSV
+
+	.align	4
+	.globl	ffi_closure_SYSV
+	.ent	ffi_closure_SYSV
+	FFI_HIDDEN(ffi_closure_SYSV)
+
+ffi_closure_SYSV:
+	cfi_startproc
+	ldgp	$29, 0($27)
+	subl	$30, CLOSURE_FS, $30
+	cfi_adjust_cfa_offset(CLOSURE_FS)
+	stl	$26, 0($30)
+	.prologue 1
+	cfi_rel_offset($26, 0)
+
+	# Store all of the potential argument registers in va_list format.
+	stl	$16, 10*8($30)
+	stl	$17, 11*8($30)
+	stl	$18, 12*8($30)
+
+	ldl	$16, 24($1)			# load cif
+	ldl	$17, 32($1)			# load fun
+	ldl	$18, 40($1)			# load user_data
+
+$do_closure:
+	stl	$19, 13*8($30)
+	stl	$20, 14*8($30)
+	stl	$21, 15*8($30)
+	fstd	$f16, 4*8($30)
+	fstd	$f17, 5*8($30)
+	fstd	$f18, 6*8($30)
+	fstd	$f19, 7*8($30)
+	fstd	$f20, 8*8($30)
+	fstd	$f21, 9*8($30)
+
+	# Call ffi_closure_SYSV_inner to do the bulk of the work.
+	ldi	$19, 2*8($30)
+	ldi	$20, 10*8($30)
+	call	$26, ffi_closure_SYSV_inner
+0:
+	ldih	$29, 0($26)			!gpdisp!2
+	ldi	$2, 99f-0b($26)
+	s4addl	$0, 0, $1			# ldcode * 4
+	ldl	$0, 16($30)			# preload return value
+	s4addl	$1, $2, $1			# 99f + ldcode * 16
+	ldi	$29, 0($29)			!gpdisp!2
+	ldl	$26, 0($30)
+	cfi_restore($26)
+	jmp	$31, ($1), $load_32
+
+.macro epilogue
+	addl	$30, CLOSURE_FS, $30
+	cfi_adjust_cfa_offset(-CLOSURE_FS)
+	ret
+	.align	4
+	cfi_adjust_cfa_offset(CLOSURE_FS)
+.endm
+
+	.align 4
+99:
+E SW64_LD_VOID
+	epilogue
+
+E SW64_LD_INT64
+	epilogue
+
+E SW64_LD_INT32
+$load_32:
+	sextl	$0, $0
+	epilogue
+
+E SW64_LD_UINT16
+	zapnot	$0, 3, $0
+	epilogue
+
+E SW64_LD_SINT16
+#ifdef __sw_64_bwx__
+	sexth	$0, $0
+#else
+	sll	$0, 48, $0
+	sra	$0, 48, $0
+#endif
+	epilogue
+
+E SW64_LD_UINT8
+	and	$0, 0xff, $0
+	epilogue
+
+E SW64_LD_SINT8
+#ifdef __sw_64_bwx__
+	sextb	$0, $0
+#else
+	sll	$0, 56, $0
+	sra	$0, 56, $0
+#endif
+	epilogue
+
+E SW64_LD_FLOAT
+	flds	$f0, 16($sp)
+	epilogue
+
+E SW64_LD_DOUBLE
+	fldd	$f0, 16($sp)
+	epilogue
+
+E SW64_LD_CPLXF
+	flds	$f0, 16($sp)
+	flds	$f1, 20($sp)
+	epilogue
+
+E SW64_LD_CPLXD
+	fldd	$f0, 16($sp)
+	fldd	$f1, 24($sp)
+	epilogue
+
+	cfi_endproc
+	.end	ffi_closure_SYSV
+
+#if defined __SYSV__ && defined __linux__
+	.section	.note.GNU-stack,"",@progbits
+#endif
diff --git a/testsuite/libffi.complex/cls_complex_va_float.c b/testsuite/libffi.complex/cls_complex_va_float.c
index 2b17826..0861ac6 100644
--- a/testsuite/libffi.complex/cls_complex_va_float.c
+++ b/testsuite/libffi.complex/cls_complex_va_float.c
@@ -6,11 +6,11 @@
 
 /* { dg-do run } */
 
-/* Alpha splits _Complex into two arguments.  It's illegal to pass
+/* Alpha/Sunway splits _Complex into two arguments.  It's illegal to pass
    float through varargs, so _Complex float goes badly.  In sort of
    gets passed as _Complex double, but the compiler doesn't agree
    with itself on this issue.  */
-/* { dg-do run { xfail alpha*-*-* } } */
+/* { dg-do run { xfail alpha*-*-* sw64*-*-* sw_64*-*-* } } */
 
 #include "complex_defs_float.inc"
 #include "cls_complex_va.inc"
-- 
2.31.1

