回复：[PATCH] package/libffi: Add csky cpu support

["MaJun" <majun258@linux.alibaba.com>]

Hi Mr Green: 
    Could you help to review this patch?  
Thanks !


------------------------------------------------------------------
发件人：Ma Jun <majun258@linux.alibaba.com>
发送时间：2020年3月23日(星期一) 15:04
收件人：libffi-discuss <libffi-discuss@sourceware.org>
抄　送：majun258 <majun258@linux.alibaba.com>; linux-csky <linux-csky@vger.kernel.org>; wenmeng_zhang <wenmeng_zhang@c-sky.com>
主　题：[PATCH] package/libffi: Add csky cpu support

This patch added the support for csky cpu architecture

Signed-off-by: Zhang Wenmeng <wenmeng_zhang@c-sky.com>
Signed-off-by: Ma Jun <majun258@linux.alibaba.com>
---
 Makefile.am          |   2 +
 README.md            |   1 +
 configure.host       |   5 +
 src/csky/ffi.c       | 395 +++++++++++++++++++++++++++++++++++++++++++
 src/csky/ffitarget.h |  63 +++++++
 src/csky/sysv.S      | 371 ++++++++++++++++++++++++++++++++++++++++
 6 files changed, 837 insertions(+)
 create mode 100644 src/csky/ffi.c
 create mode 100644 src/csky/ffitarget.h
 create mode 100644 src/csky/sysv.S

diff --git a/Makefile.am b/Makefile.am
index f83e444..e528ffd 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -53,6 +53,7 @@ noinst_HEADERS = \
  src/avr32/ffitarget.h      \
  src/bfin/ffitarget.h      \
  src/cris/ffitarget.h      \
+ src/csky/ffitarget.h      \
  src/frv/ffitarget.h      \
  src/ia64/ffitarget.h src/ia64/ia64_flags.h   \
  src/m32r/ffitarget.h      \
@@ -85,6 +86,7 @@ EXTRA_libffi_la_SOURCES = \
  src/avr32/ffi.c src/avr32/sysv.S    \
  src/bfin/ffi.c src/bfin/sysv.S     \
  src/cris/ffi.c src/cris/sysv.S     \
+ src/csky/ffi.c src/csky/sysv.S     \
  src/frv/ffi.c src/frv/eabi.S     \
  src/ia64/ffi.c src/ia64/unix.S     \
  src/m32r/ffi.c src/m32r/sysv.S     \
diff --git a/README.md b/README.md
index 3caf2fa..bdfe880 100644
--- a/README.md
+++ b/README.md
@@ -58,6 +58,7 @@ tested:
 | ARM             | iOS              | GCC                     |
 | AVR32           | Linux            | GCC                     |
 | Blackfin        | uClinux          | GCC                     |
+| CSKY            | Linux            | GCC                     |
 | HPPA            | HPUX             | GCC                     |
 | IA-64           | Linux            | GCC                     |
 | M68K            | FreeMiNT         | GCC                     |
diff --git a/configure.host b/configure.host
index 7634c3a..9201cd4 100644
--- a/configure.host
+++ b/configure.host
@@ -43,6 +43,11 @@ case "${host}" in
  SOURCES="ffi.c sysv.S"
  ;;

+  csky-*-*)
+ TARGET=CSKY; TARGETDIR=csky
+ SOURCES="ffi.c sysv.S"
+ ;;
+
   frv-*-*)
  TARGET=FRV; TARGETDIR=frv
  SOURCES="ffi.c eabi.S"
diff --git a/src/csky/ffi.c b/src/csky/ffi.c
new file mode 100644
index 0000000..eb53848
--- /dev/null
+++ b/src/csky/ffi.c
@@ -0,0 +1,395 @@
+/* -----------------------------------------------------------------------
+   ffi.c
+
+   CSKY 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>
+
+/* ffi_prep_args is called by the assembly routine once stack space
+   has been allocated for the function's arguments
+*/
+void ffi_prep_args(char *stack, extended_cif *ecif)
+{
+ register unsigned int i;
+ register void **p_argv;
+ register char *argp;
+ register ffi_type **p_arg;
+
+ argp = stack;
+
+ if ( ecif->cif->flags == FFI_TYPE_STRUCT ) {
+  *(void **) argp = ecif->rvalue;
+  argp += 4;
+ }
+
+ p_argv = ecif->avalue;
+
+ for (i = ecif->cif->nargs, p_arg = ecif->cif->arg_types;
+   (i != 0);
+   i--, p_arg++)
+ {
+  size_t z;
+  size_t alignment;
+
+  /* Align if necessary */
+  alignment = (*p_arg)->alignment;
+#ifdef __CSKYABIV1__
+  /*
+   * Adapt ABIV1 bug.
+   * If struct's size is larger than 8 bytes, then it always alignment as 4 bytes.
+   */
+  if (((*p_arg)->type == FFI_TYPE_STRUCT) && ((*p_arg)->size > 8) && (alignment == 8)) {
+   alignment = 4;
+  }
+#endif
+
+  if ((alignment - 1) & (unsigned) argp) {
+   argp = (char *) FFI_ALIGN(argp, alignment);
+  }
+
+  if ((*p_arg)->type == FFI_TYPE_STRUCT)
+   argp = (char *) FFI_ALIGN(argp, 4);
+
+  z = (*p_arg)->size;
+  if (z < sizeof(int))
+  {
+   z = sizeof(int);
+   switch ((*p_arg)->type)
+   {
+   case FFI_TYPE_SINT8:
+    *(signed int *) argp = (signed int)*(SINT8 *)(* p_argv);
+    break;
+
+   case FFI_TYPE_UINT8:
+    *(unsigned int *) argp = (unsigned int)*(UINT8 *)(* p_argv);
+    break;
+
+   case FFI_TYPE_SINT16:
+    *(signed int *) argp = (signed int)*(SINT16 *)(* p_argv);
+    break;
+
+   case FFI_TYPE_UINT16:
+    *(unsigned int *) argp = (unsigned int)*(UINT16 *)(* p_argv);
+    break;
+
+   case FFI_TYPE_STRUCT:
+#ifdef __CSKYBE__
+    memcpy((argp + 4 - (*p_arg)->size), *p_argv, (*p_arg)->size);
+#else
+    memcpy(argp, *p_argv, (*p_arg)->size);
+#endif
+    break;
+
+   default:
+    FFI_ASSERT(0);
+   }
+  }
+  else if (z == sizeof(int))
+  {
+   *(unsigned int *) argp = (unsigned int)*(UINT32 *)(* p_argv);
+  }
+  else
+  {
+   memcpy(argp, *p_argv, z);
+  }
+  p_argv++;
+  argp += z;
+ }
+
+ return;
+}
+
+/* Perform machine dependent cif processing */
+ffi_status ffi_prep_cif_machdep(ffi_cif *cif)
+{
+  /* Round the stack up to a multiple of 8 bytes.  This isn't needed
+     everywhere, but it is on some platforms, and it doesn't hcsky anything
+     when it isn't needed.  */
+  cif->bytes = (cif->bytes + 7) & ~7;
+
+  /* Set the return type flag */
+  switch (cif->rtype->type)
+    {
+
+    case FFI_TYPE_DOUBLE:
+    case FFI_TYPE_SINT64:
+    case FFI_TYPE_UINT64:
+      cif->flags = (unsigned) FFI_TYPE_SINT64;
+      break;
+
+    case FFI_TYPE_STRUCT:
+      if (cif->rtype->size <= 4)
+ /* A Composite Type not larger than 4 bytes is returned in r0.  */
+ cif->flags = (unsigned)FFI_TYPE_INT;
+      else if (cif->rtype->size <= 8)
+ /* A Composite Type not larger than 8 bytes is returned in r0, r1.  */
+ cif->flags = (unsigned)FFI_TYPE_SINT64;
+      else
+ /* A Composite Type larger than 8 bytes, or whose size cannot
+    be determined statically ... is stored in memory at an
+    address passed [in r0].  */
+ cif->flags = (unsigned)FFI_TYPE_STRUCT;
+      break;
+
+    default:
+      cif->flags = FFI_TYPE_INT;
+      break;
+    }
+
+  return FFI_OK;
+}
+
+/* Perform machine dependent cif processing for variadic calls */
+ffi_status ffi_prep_cif_machdep_var(ffi_cif *cif,
+        unsigned int nfixedargs,
+        unsigned int ntotalargs)
+{
+  return ffi_prep_cif_machdep(cif);
+}
+
+/* Prototypes for assembly functions, in sysv.S */
+extern void ffi_call_SYSV (void (*fn)(void), extended_cif *, unsigned, unsigned, unsigned *);
+
+void ffi_call(ffi_cif *cif, void (*fn)(void), void *rvalue, void **avalue)
+{
+  extended_cif ecif;
+
+  int small_struct = (cif->flags == FFI_TYPE_INT
+        && cif->rtype->type == FFI_TYPE_STRUCT);
+
+  ecif.cif = cif;
+  ecif.avalue = avalue;
+
+  unsigned int temp;
+
+  /* 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) &&
+      (cif->flags == FFI_TYPE_STRUCT))
+    {
+      ecif.rvalue = alloca(cif->rtype->size);
+    }
+  else if (small_struct)
+    ecif.rvalue = &temp;
+  else
+    ecif.rvalue = rvalue;
+
+  switch (cif->abi)
+    {
+    case FFI_SYSV:
+      ffi_call_SYSV (fn, &ecif, cif->bytes, cif->flags, ecif.rvalue);
+      break;
+
+    default:
+      FFI_ASSERT(0);
+      break;
+    }
+  if (small_struct)
+#ifdef __CSKYBE__
+    memcpy (rvalue, ((unsigned char *)&temp + (4 - cif->rtype->size)), cif->rtype->size);
+#else
+    memcpy (rvalue, &temp, cif->rtype->size);
+#endif
+}
+
+/** private members **/
+
+static void ffi_prep_incoming_args_SYSV (char *stack, void **ret,
+      void** args, ffi_cif* cif);
+
+void ffi_closure_SYSV (ffi_closure *);
+
+/* This function is jumped to by the trampoline */
+
+unsigned int
+ffi_closure_SYSV_inner (closure, respp, args)
+     ffi_closure *closure;
+     void **respp;
+     void *args;
+{
+  // our various things...
+  ffi_cif       *cif;
+  void         **arg_area;
+
+  cif         = closure->cif;
+  arg_area    = (void**) alloca (cif->nargs * sizeof (void*));
+
+  /* this call will initialize ARG_AREA, such that each
+   * element in that array points to the corresponding
+   * value on the stack; and if the function returns
+   * a structure, it will re-set RESP to point to the
+   * structure return address.  */
+
+  ffi_prep_incoming_args_SYSV(args, respp, arg_area, cif);
+
+  (closure->fun) (cif, *respp, arg_area, closure->user_data);
+
+#ifdef __CSKYBE__
+  if (cif->flags == FFI_TYPE_INT && cif->rtype->type == FFI_TYPE_STRUCT) {
+      unsigned int tmp = 0;
+      tmp = *(unsigned int *)(*respp);
+      *(unsigned int *)(*respp) = (tmp >> ((4 - cif->rtype->size) * 8));
+  }
+#endif
+
+  return cif->flags;
+}
+
+
+static void
+ffi_prep_incoming_args_SYSV(char *stack, void **rvalue,
+       void **avalue, ffi_cif *cif)
+{
+  register unsigned int i;
+  register void **p_argv;
+  register char *argp;
+  register ffi_type **p_arg;
+
+  argp = stack;
+
+  if ( cif->flags == FFI_TYPE_STRUCT ) {
+    *rvalue = *(void **) argp;
+    argp += 4;
+  }
+
+  p_argv = avalue;
+
+  for (i = cif->nargs, p_arg = cif->arg_types; (i != 0); i--, p_arg++)
+    {
+      size_t z;
+      size_t alignment;
+
+      alignment = (*p_arg)->alignment;
+      if (alignment < 4)
+ alignment = 4;
+
+#ifdef __CSKYABIV1__
+      /*
+       * Adapt ABIV1 bug.
+       * If struct's size is larger than 8 bytes, then it always alignment as 4 bytes.
+       */
+      if (((*p_arg)->type == FFI_TYPE_STRUCT) && ((*p_arg)->size > 8) && (alignment == 8)) {
+        alignment = 4;
+      }
+#endif
+
+      /* Align if necessary */
+      if ((alignment - 1) & (unsigned) argp) {
+ argp = (char *) FFI_ALIGN(argp, alignment);
+      }
+
+      z = (*p_arg)->size;
+
+#ifdef __CSKYBE__
+      unsigned int tmp = 0;
+      if ((*p_arg)->size < 4) {
+        tmp = *(unsigned int *)argp;
+        memcpy(argp, ((unsigned char *)&tmp + (4 - (*p_arg)->size)), (*p_arg)->size);
+      }
+#else
+      /* because we're little endian, this is what it turns into.   */
+#endif
+      *p_argv = (void*) argp;
+
+      p_argv++;
+      argp += z;
+    }
+
+  return;
+}
+
+/* How to make a trampoline.  */
+
+extern unsigned char ffi_csky_trampoline[TRAMPOLINE_SIZE];
+
+/*
+ * Since there is no __clear_cache in libgcc in csky toolchain.
+ * define ffi_csky_cacheflush in sysv.S.
+ * void ffi_csky_cacheflush(uint32 start_addr, uint32 size, int cache)
+ */
+#define CACHEFLUSH_IN_FFI 1
+#if CACHEFLUSH_IN_FFI
+extern void ffi_csky_cacheflush(unsigned char *__tramp, unsigned int k,
+  int i);
+#define FFI_INIT_TRAMPOLINE(TRAMP,FUN,CTX)                              \
+({ unsigned char *__tramp = (unsigned char*)(TRAMP);                    \
+   unsigned int  __fun = (unsigned int)(FUN);                           \
+   unsigned int  __ctx = (unsigned int)(CTX);                           \
+   unsigned char *insns = (unsigned char *)(CTX);                       \
+   memcpy (__tramp, ffi_csky_trampoline, TRAMPOLINE_SIZE);              \
+   *(unsigned int*) &__tramp[TRAMPOLINE_SIZE] = __ctx;                  \
+   *(unsigned int*) &__tramp[TRAMPOLINE_SIZE + 4] = __fun;              \
+   ffi_csky_cacheflush(&__tramp[0], TRAMPOLINE_SIZE, 3); /* Clear data mapping.  */ \
+   ffi_csky_cacheflush(insns, TRAMPOLINE_SIZE, 3);                       \
+                                                 /* Clear instruction   \
+                                                    mapping.  */        \
+ })
+#else
+#define FFI_INIT_TRAMPOLINE(TRAMP,FUN,CTX)                              \
+({ unsigned char *__tramp = (unsigned char*)(TRAMP);                    \
+   unsigned int  __fun = (unsigned int)(FUN);                           \
+   unsigned int  __ctx = (unsigned int)(CTX);                           \
+   unsigned char *insns = (unsigned char *)(CTX);                       \
+   memcpy (__tramp, ffi_csky_trampoline, TRAMPOLINE_SIZE);              \
+   *(unsigned int*) &__tramp[TRAMPOLINE_SIZE] = __ctx;                  \
+   *(unsigned int*) &__tramp[TRAMPOLINE_SIZE + 4] = __fun;              \
+   __clear_cache((&__tramp[0]), (&__tramp[TRAMPOLINE_SIZE-1])); /* Clear data mapping.  */ \
+   __clear_cache(insns, insns + TRAMPOLINE_SIZE);                       \
+                                                 /* Clear instruction   \
+                                                    mapping.  */        \
+ })
+#endif
+
+/* the cif must already be prep'ed */
+
+ffi_status
+ffi_prep_closure_loc (ffi_closure* closure,
+        ffi_cif* cif,
+        void (*fun)(ffi_cif*,void*,void**,void*),
+        void *user_data,
+        void *codeloc)
+{
+  void (*closure_func)(ffi_closure*) = NULL;
+
+  if (cif->abi == FFI_SYSV)
+    closure_func = &ffi_closure_SYSV;
+  else
+    return FFI_BAD_ABI;
+
+  FFI_INIT_TRAMPOLINE (&closure->tramp[0], \
+         closure_func,  \
+         codeloc);
+
+  closure->cif  = cif;
+  closure->user_data = user_data;
+  closure->fun  = fun;
+
+  return FFI_OK;
+}
+
+
diff --git a/src/csky/ffitarget.h b/src/csky/ffitarget.h
new file mode 100644
index 0000000..f770aac
--- /dev/null
+++ b/src/csky/ffitarget.h
@@ -0,0 +1,63 @@
+/* -----------------------------------------------------------------*-C-*-
+   ffitarget.h - Copyright (c) 2012  Anthony Green
+                 Copyright (c) 2010  CodeSourcery
+                 Copyright (c) 1996-2003  Red Hat, Inc.
+
+   Target configuration macros for CSKY.
+
+   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
+
+#ifdef __CSKYABIV2__
+#define FFI_ASM_ARGREG_SIZE 16
+#define TRAMPOLINE_SIZE 16
+#define FFI_TRAMPOLINE_SIZE 24
+#else
+#define FFI_ASM_ARGREG_SIZE 24
+#define TRAMPOLINE_SIZE 20
+#define FFI_TRAMPOLINE_SIZE 28
+#endif
+
+/* ---- Definitions for closures ----------------------------------------- */
+
+#define FFI_CLOSURES 1
+#define FFI_NATIVE_RAW_API 0
+#endif
diff --git a/src/csky/sysv.S b/src/csky/sysv.S
new file mode 100644
index 0000000..962a796
--- /dev/null
+++ b/src/csky/sysv.S
@@ -0,0 +1,371 @@
+/* -----------------------------------------------------------------------
+   sysv.S
+
+   CSKY 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>
+
+.macro CSKY_FUNC_START name
+ .text
+ .align 2
+ .globl \name
+ .type \name, @function
+ \name:
+.endm
+
+#ifdef __CSKYABIV2__
+
+ /*
+  * a0:   fn
+  * a1:   &ecif
+  * a2:   cif->bytes
+  * a3:   fig->flags
+  * sp+0: ecif.rvalue
+  */
+CSKY_FUNC_START ffi_call_SYSV
+ /* Save registers */
+ .cfi_startproc
+ subi sp, 28
+ .cfi_def_cfa_offset 28
+ stw a0, (sp, 0x0)
+ .cfi_offset 0, -28
+ stw a1, (sp, 0x4)
+ .cfi_offset 1, -24
+ stw a2, (sp, 0x8)
+ .cfi_offset 2, -20
+ stw a3, (sp, 0xC)
+ .cfi_offset 3, -16
+ stw l0, (sp, 0x10)
+ .cfi_offset 4, -12
+ stw l1, (sp, 0x14)
+ .cfi_offset 5, -8
+ stw lr, (sp, 0x18)
+ .cfi_offset 15, -4
+
+ mov l0, sp
+ .cfi_def_cfa_register 4
+
+ /* Make room for all of the new args. */
+ subu sp, sp, a2
+
+ /* Place all of the ffi_prep_args in position */
+ mov a0, sp
+ /*     a1 already set */
+
+ /* Call ffi_prep_args(stack, &ecif) */
+ jsri ffi_prep_args
+
+ /* move first 4 parameters in registers */
+ ldw a0, (sp, 0x0)
+ ldw a1, (sp, 0x4)
+ ldw a2, (sp, 0x8)
+ ldw a3, (sp, 0xC)
+
+ /* and adjust stack */
+ subu lr, l0, sp /* cif->bytes == l0 - sp */
+ cmphsi lr, 16
+ movi l1, 16
+ movt lr, l1
+ addu sp, sp, lr
+
+ ldw l1, (l0, 0) /* load fn() in advance */
+
+ /* call (fn) (...) */
+ jsr l1
+
+ /* Remove the space we pushed for the args */
+ mov sp, l0
+
+ /* Load r2 with the pointer to storage for the return value */
+ ldw a2, (sp, 0x1C)
+
+ /* Load r3 with the return type code */
+ ldw a3, (sp, 0xC)
+
+ /* If the return value pointer is NULL, assume no return value. */
+ cmpnei a2, 0
+ bf .Lepilogue
+
+ cmpnei a3, FFI_TYPE_STRUCT
+ bf .Lepilogue
+
+ /* return INT64 */
+ cmpnei a3, FFI_TYPE_SINT64
+ bt .Lretint
+ /* stw a0, (a2, 0x0) at .Lretint */
+ stw a1, (a2, 0x4)
+
+.Lretint:
+ /* return INT */
+ stw a0, (a2, 0x0)
+
+.Lepilogue:
+ ldw a0, (sp, 0x0)
+ ldw a1, (sp, 0x4)
+ ldw a2, (sp, 0x8)
+ ldw a3, (sp, 0xC)
+ ldw l0, (sp, 0x10)
+ ldw l1, (sp, 0x14)
+ ldw lr, (sp, 0x18)
+ addi sp, sp, 28
+ rts
+ .cfi_endproc
+        .size    ffi_call_SYSV, .-ffi_call_SYSV
+
+
+ /*
+  * unsigned int FFI_HIDDEN
+  * ffi_closure_SYSV_inner (closure, respp, args)
+  *      ffi_closure *closure;
+  *      void **respp;
+  *      void *args;
+  */
+CSKY_FUNC_START ffi_closure_SYSV
+ .cfi_startproc
+ mov a2, sp
+ addi a1, sp, 16
+ subi sp, sp, 24
+ .cfi_def_cfa_offset 40
+ stw a1, (sp, 0x10)
+ .cfi_offset 1, -24
+ stw lr, (sp, 0x14)
+ .cfi_offset 15, -20
+ stw sp, (sp, 0x8)
+ addi a1, sp, 8
+ jsri ffi_closure_SYSV_inner
+ ldw a0, (sp, 0x0)
+ /*
+  * if FFI_TYPE_SINT64, need a1.
+  * if FFI_TYPE_INT, ignore a1.
+  */
+ ldw a1, (sp, 0x4)
+
+ ldw lr, (sp, 0x14)
+ addi sp, sp, 40
+ rts
+ .cfi_endproc
+        .size    ffi_closure_SYSV, .-ffi_closure_SYSV
+
+CSKY_FUNC_START ffi_csky_trampoline
+ subi sp, sp, 16
+ stw a0, (sp, 0x0)
+ stw a1, (sp, 0x4)
+ stw a2, (sp, 0x8)
+ stw a3, (sp, 0xC)
+ lrw a0, [.Lctx]
+ lrw a1, [.Lfun]
+ jmp a1
+.Lctx:
+ mov a0, a0
+ mov a0, a0
+.Lfun:
+
+        .size    ffi_csky_trampoline, .-ffi_csky_trampoline
+
+CSKY_FUNC_START ffi_csky_cacheflush
+ mov t0, r7
+ movi r7, 123
+ trap 0
+ mov r7, t0
+ rts
+
+        .size    ffi_csky_cacheflush, .-ffi_csky_cacheflush
+
+#else /* !__CSKYABIV2__ */
+
+ /*
+  * a0:   fn
+  * a1:   &ecif
+  * a2:   cif->bytes
+  * a3:   fig->flags
+  * a4:   ecif.rvalue
+  */
+CSKY_FUNC_START ffi_call_SYSV
+ /* Save registers */
+ .cfi_startproc
+ subi sp, 32
+ subi sp, 8
+ .cfi_def_cfa_offset 40
+ stw a0, (sp, 0x0)
+ .cfi_offset 2, -40
+ stw a1, (sp, 0x4)
+ .cfi_offset 3, -36
+ stw a2, (sp, 0x8)
+ .cfi_offset 4, -32
+ stw a3, (sp, 0xC)
+ .cfi_offset 5, -28
+ stw a4, (sp, 0x10)
+ .cfi_offset 6, -24
+ stw a5, (sp, 0x14)
+ .cfi_offset 7, -20
+ stw l0, (sp, 0x18)
+ .cfi_offset 8, -16
+ stw l1, (sp, 0x1C)
+ .cfi_offset 9, -12
+ stw lr, (sp, 0x20)
+ .cfi_offset 15, -8
+
+ mov l0, sp
+ .cfi_def_cfa_register 8
+
+ /* Make room for all of the new args. */
+ subu sp, sp, a2
+
+ /* Place all of the ffi_prep_args in position */
+ mov a0, sp
+ /*     a1 already set */
+
+ /* Call ffi_prep_args(stack, &ecif) */
+ jsri ffi_prep_args
+
+ /* move first 4 parameters in registers */
+ ldw a0, (sp, 0x0)
+ ldw a1, (sp, 0x4)
+ ldw a2, (sp, 0x8)
+ ldw a3, (sp, 0xC)
+ ldw a4, (sp, 0x10)
+ ldw a5, (sp, 0x14)
+
+ /* and adjust stack */
+ mov lr, l0
+ subu lr, sp  /* cif->bytes == l0 - sp */
+ movi l1, 24
+ cmphs lr, l1
+ movt lr, l1
+ addu sp, sp, lr
+
+ ldw l1, (l0, 0) /* load fn() in advance */
+
+ /* call (fn) (...) */
+ jsr l1
+
+ /* Remove the space we pushed for the args */
+ mov sp, l0
+
+ /* Load r2 with the pointer to storage for the return value */
+ ldw a2, (sp, 0x10)
+
+ /* Load r3 with the return type code */
+ ldw a3, (sp, 0xC)
+
+ /* If the return value pointer is NULL, assume no return value. */
+ cmpnei a2, 0
+ bf .Lepilogue
+
+ cmpnei a3, FFI_TYPE_STRUCT
+ bf .Lepilogue
+
+ /* return INT64 */
+ cmpnei a3, FFI_TYPE_SINT64
+ bt .Lretint
+ /* stw a0, (a2, 0x0) at .Lretint */
+ stw a1, (a2, 0x4)
+
+.Lretint:
+ /* return INT */
+ stw a0, (a2, 0x0)
+
+.Lepilogue:
+ ldw a0, (sp, 0x0)
+ ldw a1, (sp, 0x4)
+ ldw a2, (sp, 0x8)
+ ldw a3, (sp, 0xC)
+ ldw a4, (sp, 0x10)
+ ldw a5, (sp, 0x14)
+ ldw l0, (sp, 0x18)
+ ldw l1, (sp, 0x1C)
+ ldw lr, (sp, 0x20)
+ addi sp, sp, 32
+ addi sp, sp, 8
+ rts
+ .cfi_endproc
+
+        .size    ffi_call_SYSV, .-ffi_call_SYSV
+
+
+ /*
+  * unsigned int FFI_HIDDEN
+  * ffi_closure_SYSV_inner (closure, respp, args)
+  *      ffi_closure *closure;
+  *      void **respp;
+  *      void *args;
+  */
+CSKY_FUNC_START ffi_closure_SYSV
+ .cfi_startproc
+ mov a2, sp
+ mov a1, sp
+ addi a1, 24
+ subi sp, sp, 24
+ .cfi_def_cfa_offset 48
+ stw a1, (sp, 0x10)
+ .cfi_offset 3, -32
+ stw lr, (sp, 0x14)
+ .cfi_offset 15, -28
+ stw sp, (sp, 0x8)
+ mov a1, sp
+ addi a1, 8
+ jsri ffi_closure_SYSV_inner
+ ldw a0, (sp, 0x0)
+ /*
+  * if FFI_TYPE_SINT64, need a1.
+  * if FFI_TYPE_INT, ignore a1.
+  */
+ ldw a1, (sp, 0x4)
+
+ ldw lr, (sp, 0x14)
+ addi sp, sp, 24
+ addi sp, sp, 24
+ rts
+ .cfi_endproc
+
+        .size    ffi_closure_SYSV, .-ffi_closure_SYSV
+
+CSKY_FUNC_START ffi_csky_trampoline
+ subi sp, 24
+ stw a0, (sp, 0x0)
+ stw a1, (sp, 0x4)
+ stw a2, (sp, 0x8)
+ stw a3, (sp, 0xC)
+ stw a4, (sp, 0x10)
+ stw a5, (sp, 0x14)
+ lrw a0, [.Lctx]
+ lrw a1, [.Lfun]
+ jmp a1
+.Lctx:
+ mov a0, a0
+ mov a0, a0
+.Lfun:
+
+        .size    ffi_csky_trampoline, .-ffi_csky_trampoline
+
+CSKY_FUNC_START ffi_csky_cacheflush
+ lrw r1, 123
+ trap 0
+ rts
+
+        .size    ffi_csky_cacheflush, .-ffi_csky_cacheflush
+
+#endif /* __CSKYABIV2__ */
-- 
2.17.1