Initial revision

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@28593 138bc75d-0d04-0410-961f-82ee72b054a4

2 files changed, 639 insertions, 0 deletions

diff --git a/libffi/src/x86/ffi.c b/libffi/src/x86/ffi.c
new file mode 100644
index 00000000000..1e58e031e63
--- /dev/null
+++ b/libffi/src/x86/ffi.c
@@ -0,0 +1,510 @@
+/* -----------------------------------------------------------------------
+   ffi.c - Copyright (c) 1996, 1998, 1999  Cygnus Solutions
+   
+   x86 Foreign Function Interface 
+
+   $Id: ffi.c,v 1.3 1999/08/08 13:05:12 green Exp $
+
+   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 CYGNUS SOLUTIONS 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 */
+
+/*@-exportheader@*/
+void ffi_prep_args(char *stack, extended_cif *ecif)
+/*@=exportheader@*/
+{
+  register unsigned int i;
+  register int tmp;
+  register unsigned int avn;
+  register void **p_argv;
+  register char *argp;
+  register ffi_type **p_arg;
+
+  tmp = 0;
+  argp = stack;
+
+  if ( ecif->cif->rtype->type == FFI_TYPE_STRUCT ) {
+    *(void **) argp = ecif->rvalue;
+    argp += 4;
+  }
+
+  avn = ecif->cif->nargs;
+  p_argv = ecif->avalue;
+
+  for (i = ecif->cif->nargs, p_arg = ecif->cif->arg_types;
+       (i != 0) && (avn != 0);
+       i--, p_arg++)
+    {
+      size_t z;
+
+      /* Align if necessary */
+      if (((*p_arg)->alignment - 1) & (unsigned) argp) {
+	argp = (char *) ALIGN(argp, (*p_arg)->alignment);
+      }
+
+      if (avn != 0) 
+	{
+	  avn--;
+	  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_SINT32:
+		  *(signed int *) argp = (signed int)*(SINT32 *)(* p_argv);
+		  break;
+		  
+		case FFI_TYPE_UINT32:
+		  *(unsigned int *) argp = (unsigned int)*(UINT32 *)(* p_argv);
+		  break;
+
+		case FFI_TYPE_STRUCT:
+		  *(unsigned int *) argp = (unsigned int)*(UINT32 *)(* p_argv);
+		  break;
+
+		default:
+		  FFI_ASSERT(0);
+		}
+	    }
+	  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)
+{
+  /* Set the return type flag */
+  switch (cif->rtype->type)
+    {
+    case FFI_TYPE_VOID:
+    case FFI_TYPE_STRUCT:
+    case FFI_TYPE_SINT64:
+    case FFI_TYPE_FLOAT:
+    case FFI_TYPE_DOUBLE:
+    case FFI_TYPE_LONGDOUBLE:
+      cif->flags = (unsigned) cif->rtype->type;
+      break;
+
+    case FFI_TYPE_UINT64:
+      cif->flags = FFI_TYPE_SINT64;
+      break;
+
+    default:
+      cif->flags = FFI_TYPE_INT;
+      break;
+    }
+
+  return FFI_OK;
+}
+
+/*@-declundef@*/
+/*@-exportheader@*/
+extern void ffi_call_SYSV(void (*)(char *, extended_cif *), 
+			  /*@out@*/ extended_cif *, 
+			  unsigned, unsigned, 
+			  /*@out@*/ unsigned *, 
+			  void (*fn)());
+/*@=declundef@*/
+/*@=exportheader@*/
+
+void ffi_call(/*@dependent@*/ ffi_cif *cif, 
+	      void (*fn)(), 
+	      /*@out@*/ void *rvalue, 
+	      /*@dependent@*/ void **avalue)
+{
+  extended_cif ecif;
+
+  ecif.cif = cif;
+  ecif.avalue = avalue;
+  
+  /* 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->rtype->type == FFI_TYPE_STRUCT))
+    {
+      /*@-sysunrecog@*/
+      ecif.rvalue = alloca(cif->rtype->size);
+      /*@=sysunrecog@*/
+    }
+  else
+    ecif.rvalue = rvalue;
+    
+  
+  switch (cif->abi) 
+    {
+    case FFI_SYSV:
+      /*@-usedef@*/
+      ffi_call_SYSV(ffi_prep_args, &ecif, cif->bytes, 
+		    cif->flags, ecif.rvalue, fn);
+      /*@=usedef@*/
+      break;
+    default:
+      FFI_ASSERT(0);
+      break;
+    }
+}
+
+
+/** private members **/
+
+static void ffi_prep_incoming_args_SYSV (char *stack, void **ret,
+					 void** args, ffi_cif* cif);
+static void ffi_closure_SYSV ();
+static void ffi_closure_raw_SYSV ();
+
+/* This function is jumped to by the trampoline, on entry, %ecx (a
+ * caller-save register) holds the address of the closure.  
+ * Clearly, this requires __GNUC__, so perhaps we should translate this
+ * into an assembly file if this is to be distributed with ffi.
+ */
+
+static void
+ffi_closure_SYSV ()
+{
+  // this is our return value storage
+  long double    res;
+
+  // our various things...
+  void          *args;
+  ffi_cif       *cif;
+  void         **arg_area;
+  ffi_closure   *closure;
+  unsigned short rtype;
+  void          *resp = (void*)&res;
+
+  /* grab the trampoline context pointer */
+  asm ("movl %%ecx,%0" : "=r" (closure));
+  
+  cif         = closure->cif;
+  arg_area    = (void**) alloca (cif->nargs * sizeof (void*));  
+  asm ("leal 8(%%ebp),%0" : "=q" (args));  
+
+  /* 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, (void**)&resp, arg_area, cif);
+  
+  (closure->fun) (cif, resp, arg_area, closure->user_data);
+
+  rtype = cif->flags;
+
+  /* now, do a generic return based on the value of rtype */
+  if (rtype == FFI_TYPE_INT)
+    {
+      asm ("movl (%0),%%eax" : : "r" (resp) : "eax");
+    }
+  else if (rtype == FFI_TYPE_FLOAT)
+    {
+      asm ("flds (%0)" : : "r" (resp) : "st" );
+    }
+  else if (rtype == FFI_TYPE_DOUBLE)
+    {
+      asm ("fldl (%0)" : : "r" (resp) : "st", "st(1)" );
+    }
+  else if (rtype == FFI_TYPE_LONGDOUBLE)
+    {
+      asm ("fldt (%0)" : : "r" (resp) : "st", "st(1)" );
+    }
+  else if (rtype == FFI_TYPE_SINT64)
+    {
+      asm ("movl 0(%0),%%eax;"
+	   "movl 4(%0),%%edx" 
+	   : : "r"(resp)
+	   : "eax", "edx");
+    }
+}
+
+/*@-exportheader@*/
+static void 
+ffi_prep_incoming_args_SYSV(char *stack, void **rvalue,
+			    void **avalue, ffi_cif *cif)
+/*@=exportheader@*/
+{
+  register unsigned int i;
+  register int tmp;
+  register unsigned int avn;
+  register void **p_argv;
+  register char *argp;
+  register ffi_type **p_arg;
+
+  tmp = 0;
+  argp = stack;
+
+  if ( cif->rtype->type == FFI_TYPE_STRUCT ) {
+    *rvalue = *(void **) argp;
+    argp += 4;
+  }
+
+  avn = cif->nargs;
+  p_argv = avalue;
+
+  for (i = cif->nargs, p_arg = cif->arg_types;
+       (i != 0) && (avn != 0);
+       i--, p_arg++)
+    {
+      size_t z;
+
+      /* Align if necessary */
+      if (((*p_arg)->alignment - 1) & (unsigned) argp) {
+	argp = (char *) ALIGN(argp, (*p_arg)->alignment);
+      }
+
+      if (avn != 0) 
+	{
+	  avn--;
+	  z = (*p_arg)->size;
+
+	  /* because we're little endian, this is 
+	     what it turns into.   */
+
+	  *p_argv = (void*) argp;
+
+	  p_argv++;
+	  argp += z;
+	}
+    }
+  
+  return;
+}
+
+/* How to make a trampoline.  Derived from gcc/config/i386/i386.c. */
+
+#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 int  __dis = __fun - ((unsigned int) __tramp + 10); \
+   *(unsigned char*) &__tramp[0] = 0xb9; \
+   *(unsigned int*)  &__tramp[1] = __ctx; \
+   *(unsigned char*) &__tramp[5] = 0xe9; \
+   *(unsigned int*)  &__tramp[6] = __dis; \
+ })
+
+
+/* the cif must already be prep'ed */
+
+ffi_status
+ffi_prep_closure (ffi_closure* closure,
+		  ffi_cif* cif,
+		  void (*fun)(ffi_cif*,void*,void**,void*),
+		  void *user_data)
+{
+  FFI_ASSERT (cif->abi == FFI_SYSV);
+
+  FFI_INIT_TRAMPOLINE (&closure->tramp[0], \
+		       &ffi_closure_SYSV,  \
+		       (void*)closure);
+    
+  closure->cif  = cif;
+  closure->user_data = user_data;
+  closure->fun  = fun;
+
+  return FFI_OK;
+}
+
+/* ------- Native raw API support -------------------------------- */
+
+#if !FFI_NO_RAW_API
+
+static void
+ffi_closure_raw_SYSV ()
+{
+  // this is our return value storage
+  long double    res;
+
+  // our various things...
+  void            *args;
+  ffi_raw         *raw_args;
+  ffi_cif         *cif;
+  ffi_raw_closure *closure;
+  unsigned short   rtype;
+  void            *resp = (void*)&res;
+
+  /* grab the trampoline context pointer */
+  asm ("movl %%ecx,%0" : "=r" (closure));
+
+  /* take the argument pointer */
+  asm ("leal 8(%%ebp),%0" : "=q" (args));  
+
+  /* get the cif */
+  cif = closure->cif;
+
+  /* the SYSV/X86 abi matches the RAW API exactly, well.. almost */
+  raw_args = (ffi_raw*) args;
+
+  (closure->fun) (cif, resp, raw_args, closure->user_data);
+
+  rtype = cif->flags;
+
+  /* now, do a generic return based on the value of rtype */
+  if (rtype == FFI_TYPE_INT)
+    {
+      asm ("movl (%0),%%eax" : : "r" (resp) : "eax");
+    }
+  else if (rtype == FFI_TYPE_FLOAT)
+    {
+      asm ("flds (%0)" : : "r" (resp) : "st" );
+    }
+  else if (rtype == FFI_TYPE_DOUBLE)
+    {
+      asm ("fldl (%0)" : : "r" (resp) : "st", "st(1)" );
+    }
+  else if (rtype == FFI_TYPE_LONGDOUBLE)
+    {
+      asm ("fldt (%0)" : : "r" (resp) : "st", "st(1)" );
+    }
+  else if (rtype == FFI_TYPE_SINT64)
+    {
+      asm ("movl 0(%0),%%eax; movl 4(%0),%%edx" 
+	   : : "r"(resp)
+	   : "eax", "edx");
+    }
+}
+
+ 
+
+
+ffi_status
+ffi_prep_raw_closure (ffi_raw_closure* closure,
+		      ffi_cif* cif,
+		      void (*fun)(ffi_cif*,void*,ffi_raw*,void*),
+		      void *user_data)
+{
+  int i;
+
+  FFI_ASSERT (cif->abi == FFI_SYSV);
+
+  // we currently don't support certain kinds of arguments for raw
+  // closures.  This should be implemented by a seperate assembly language
+  // routine, since it would require argument processing, something we
+  // don't do now for performance.
+
+  for (i = cif->nargs-1; i >= 0; i--)
+    {
+      FFI_ASSERT (cif->arg_types[i]->type != FFI_TYPE_STRUCT);
+      FFI_ASSERT (cif->arg_types[i]->type != FFI_TYPE_LONGDOUBLE);
+    }
+  
+
+  FFI_INIT_TRAMPOLINE (&closure->tramp[0], &ffi_closure_raw_SYSV,
+		       (void*)closure);
+    
+  closure->cif  = cif;
+  closure->user_data = user_data;
+  closure->fun  = fun;
+
+  return FFI_OK;
+}
+
+static void 
+ffi_prep_args_raw(char *stack, extended_cif *ecif)
+{
+  memcpy (stack, ecif->avalue, ecif->cif->bytes);
+}
+
+/* we borrow this routine from libffi (it must be changed, though, to
+ * actually call the function passed in the first argument.  as of
+ * libffi-1.20, this is not the case.)
+ */
+
+extern void 
+ffi_call_SYSV(void (*)(char *, extended_cif *), 
+	      /*@out@*/ extended_cif *, 
+	      unsigned, unsigned, 
+	      /*@out@*/ unsigned *, 
+	      void (*fn)());
+
+void
+ffi_raw_call(/*@dependent@*/ ffi_cif *cif, 
+	     void (*fn)(), 
+	     /*@out@*/ void *rvalue, 
+	     /*@dependent@*/ ffi_raw *fake_avalue)
+{
+  extended_cif ecif;
+  void **avalue = (void **)fake_avalue;
+
+  ecif.cif = cif;
+  ecif.avalue = avalue;
+  
+  /* 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->rtype->type == FFI_TYPE_STRUCT))
+    {
+      /*@-sysunrecog@*/
+      ecif.rvalue = alloca(cif->rtype->size);
+      /*@=sysunrecog@*/
+    }
+  else
+    ecif.rvalue = rvalue;
+    
+  
+  switch (cif->abi) 
+    {
+    case FFI_SYSV:
+      /*@-usedef@*/
+      ffi_call_SYSV(ffi_prep_args_raw, &ecif, cif->bytes, 
+		    cif->flags, ecif.rvalue, fn);
+      /*@=usedef@*/
+      break;
+    default:
+      FFI_ASSERT(0);
+      break;
+    }
+}
+
+#endif
diff --git a/libffi/src/x86/sysv.S b/libffi/src/x86/sysv.S
new file mode 100644
index 00000000000..41ac46015ef
--- /dev/null
+++ b/libffi/src/x86/sysv.S
@@ -0,0 +1,129 @@
+/* -----------------------------------------------------------------------
+   sysv.S - Copyright (c) 1996, 1998  Cygnus Solutions
+   
+   X86 Foreign Function Interface 
+
+   $Id: sysv.S,v 1.2 1999/08/04 18:00:05 green Exp $
+
+   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 CYGNUS SOLUTIONS 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 <ffi.h>
+
+.text
+
+.globl ffi_prep_args
+
+	# This assumes we are using gas.
+        .balign 16
+.globl ffi_call_SYSV
+        .type    ffi_call_SYSV,@function
+
+ffi_call_SYSV:
+        pushl %ebp
+        movl  %esp,%ebp
+
+	# Make room for all of the new args.
+	movl  16(%ebp),%ecx
+	subl  %ecx,%esp
+
+	movl  %esp,%eax
+
+	# Place all of the ffi_prep_args in position
+	pushl 12(%ebp)
+	pushl %eax
+	call  *8(%ebp)
+
+	# Return stack to previous state and call the function
+	addl  $8,%esp	
+
+	call  *28(%ebp)
+
+	# Remove the space we pushed for the args
+	movl  16(%ebp),%ecx
+	addl  %ecx,%esp
+
+	# Load %ecx with the return type code 
+	movl  20(%ebp),%ecx	
+
+	# If the return value pointer is NULL, assume no return value.
+	cmpl  $0,24(%ebp)
+	jne   retint
+
+	# Even if there is no space for the return value, we are 
+	# obliged to handle floating-point values.
+	cmpl  $FFI_TYPE_FLOAT,%ecx
+	jne   noretval
+	fstp  %st(0)
+
+        jmp   epilogue
+
+retint:
+	cmpl  $FFI_TYPE_INT,%ecx
+	jne   retfloat
+	# Load %ecx with the pointer to storage for the return value
+	movl  24(%ebp),%ecx	
+	movl  %eax,0(%ecx)
+	jmp   epilogue
+
+retfloat:
+	cmpl  $FFI_TYPE_FLOAT,%ecx
+	jne   retdouble
+	# Load %ecx with the pointer to storage for the return value
+	movl  24(%ebp),%ecx	
+	fstps (%ecx)
+	jmp   epilogue
+
+retdouble:
+	cmpl  $FFI_TYPE_DOUBLE,%ecx
+	jne   retlongdouble
+	# Load %ecx with the pointer to storage for the return value
+	movl  24(%ebp),%ecx	
+	fstpl (%ecx)
+	jmp   epilogue
+
+retlongdouble:
+	cmpl  $FFI_TYPE_LONGDOUBLE,%ecx
+	jne   retint64
+	# Load %ecx with the pointer to storage for the return value
+	movl  24(%ebp),%ecx	
+	fstpt (%ecx)
+	jmp   epilogue
+	
+retint64:	
+	cmpl  $FFI_TYPE_SINT64,%ecx
+        jne   retstruct
+	# Load %ecx with the pointer to storage for the return value
+	movl  24(%ebp),%ecx	
+	movl  %eax,0(%ecx)
+	movl  %edx,4(%ecx)
+	
+retstruct:
+	# Nothing to do!
+
+noretval:
+epilogue:
+        movl %ebp,%esp
+        popl %ebp
+        ret
+.ffi_call_SYSV_end:
+        .size    ffi_call_SYSV,.ffi_call_SYSV_end-ffi_call_SYSV
+