757 lines
21 KiB
C
757 lines
21 KiB
C
/* -----------------------------------------------------------------------
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ffi.c - Copyright (c) 2000, 2007 Software AG
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Copyright (c) 2008 Red Hat, Inc
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S390 Foreign Function Interface
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Permission is hereby granted, free of charge, to any person obtaining
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a copy of this software and associated documentation files (the
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``Software''), to deal in the Software without restriction, including
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without limitation the rights to use, copy, modify, merge, publish,
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distribute, sublicense, and/or sell copies of the Software, and to
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permit persons to whom the Software is furnished to do so, subject to
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the following conditions:
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The above copyright notice and this permission notice shall be included
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in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND, EXPRESS
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OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR
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OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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OTHER DEALINGS IN THE SOFTWARE.
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----------------------------------------------------------------------- */
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/*====================================================================*/
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/* Includes */
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/* -------- */
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/*====================================================================*/
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#include <ffi.h>
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#include <ffi_common.h>
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#include <stdint.h>
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#include "internal.h"
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/*====================== End of Includes =============================*/
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/*====================================================================*/
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/* Defines */
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/* ------- */
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/*====================================================================*/
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/* Maximum number of GPRs available for argument passing. */
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#define MAX_GPRARGS 5
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/* Maximum number of FPRs available for argument passing. */
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#ifdef __s390x__
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#define MAX_FPRARGS 4
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#else
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#define MAX_FPRARGS 2
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#endif
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/* Round to multiple of 16. */
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#define ROUND_SIZE(size) (((size) + 15) & ~15)
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/*===================== End of Defines ===============================*/
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/*====================================================================*/
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/* Externals */
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/* --------- */
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/*====================================================================*/
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struct call_frame
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{
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void *back_chain;
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void *eos;
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unsigned long gpr_args[5];
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unsigned long gpr_save[9];
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unsigned long long fpr_args[4];
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};
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extern void FFI_HIDDEN ffi_call_SYSV(struct call_frame *, unsigned, void *,
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void (*fn)(void), void *);
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extern void ffi_closure_SYSV(void);
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extern void ffi_go_closure_SYSV(void);
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/*====================== End of Externals ============================*/
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/*====================================================================*/
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/* */
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/* Name - ffi_check_struct_type. */
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/* */
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/* Function - Determine if a structure can be passed within a */
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/* general purpose or floating point register. */
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/* */
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/*====================================================================*/
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static int
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ffi_check_struct_type (ffi_type *arg)
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{
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size_t size = arg->size;
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/* If the struct has just one element, look at that element
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to find out whether to consider the struct as floating point. */
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while (arg->type == FFI_TYPE_STRUCT
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&& arg->elements[0] && !arg->elements[1])
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arg = arg->elements[0];
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/* Structs of size 1, 2, 4, and 8 are passed in registers,
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just like the corresponding int/float types. */
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switch (size)
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{
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case 1:
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return FFI_TYPE_UINT8;
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case 2:
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return FFI_TYPE_UINT16;
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case 4:
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if (arg->type == FFI_TYPE_FLOAT)
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return FFI_TYPE_FLOAT;
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else
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return FFI_TYPE_UINT32;
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case 8:
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if (arg->type == FFI_TYPE_DOUBLE)
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return FFI_TYPE_DOUBLE;
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else
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return FFI_TYPE_UINT64;
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default:
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break;
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}
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/* Other structs are passed via a pointer to the data. */
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return FFI_TYPE_POINTER;
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}
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/*======================== End of Routine ============================*/
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/*====================================================================*/
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/* */
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/* Name - ffi_prep_cif_machdep. */
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/* */
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/* Function - Perform machine dependent CIF processing. */
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/* */
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/*====================================================================*/
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ffi_status FFI_HIDDEN
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ffi_prep_cif_machdep(ffi_cif *cif)
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{
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size_t struct_size = 0;
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int n_gpr = 0;
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int n_fpr = 0;
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int n_ov = 0;
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ffi_type **ptr;
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int i;
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/* Determine return value handling. */
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switch (cif->rtype->type)
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{
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/* Void is easy. */
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case FFI_TYPE_VOID:
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cif->flags = FFI390_RET_VOID;
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break;
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/* Structures and complex are returned via a hidden pointer. */
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case FFI_TYPE_STRUCT:
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case FFI_TYPE_COMPLEX:
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cif->flags = FFI390_RET_STRUCT;
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n_gpr++; /* We need one GPR to pass the pointer. */
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break;
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/* Floating point values are returned in fpr 0. */
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case FFI_TYPE_FLOAT:
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cif->flags = FFI390_RET_FLOAT;
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break;
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case FFI_TYPE_DOUBLE:
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cif->flags = FFI390_RET_DOUBLE;
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break;
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#if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE
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case FFI_TYPE_LONGDOUBLE:
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cif->flags = FFI390_RET_STRUCT;
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n_gpr++;
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break;
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#endif
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/* Integer values are returned in gpr 2 (and gpr 3
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for 64-bit values on 31-bit machines). */
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case FFI_TYPE_UINT64:
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case FFI_TYPE_SINT64:
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cif->flags = FFI390_RET_INT64;
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break;
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case FFI_TYPE_POINTER:
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case FFI_TYPE_INT:
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case FFI_TYPE_UINT32:
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case FFI_TYPE_SINT32:
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case FFI_TYPE_UINT16:
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case FFI_TYPE_SINT16:
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case FFI_TYPE_UINT8:
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case FFI_TYPE_SINT8:
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/* These are to be extended to word size. */
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#ifdef __s390x__
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cif->flags = FFI390_RET_INT64;
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#else
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cif->flags = FFI390_RET_INT32;
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#endif
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break;
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default:
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FFI_ASSERT (0);
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break;
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}
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/* Now for the arguments. */
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for (ptr = cif->arg_types, i = cif->nargs;
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i > 0;
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i--, ptr++)
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{
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int type = (*ptr)->type;
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#if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE
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/* 16-byte long double is passed like a struct. */
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if (type == FFI_TYPE_LONGDOUBLE)
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type = FFI_TYPE_STRUCT;
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#endif
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/* Check how a structure type is passed. */
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if (type == FFI_TYPE_STRUCT || type == FFI_TYPE_COMPLEX)
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{
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if (type == FFI_TYPE_COMPLEX)
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type = FFI_TYPE_POINTER;
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else
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type = ffi_check_struct_type (*ptr);
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/* If we pass the struct via pointer, we must reserve space
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to copy its data for proper call-by-value semantics. */
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if (type == FFI_TYPE_POINTER)
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struct_size += ROUND_SIZE ((*ptr)->size);
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}
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/* Now handle all primitive int/float data types. */
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switch (type)
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{
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/* The first MAX_FPRARGS floating point arguments
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go in FPRs, the rest overflow to the stack. */
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case FFI_TYPE_DOUBLE:
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if (n_fpr < MAX_FPRARGS)
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n_fpr++;
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else
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n_ov += sizeof (double) / sizeof (long);
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break;
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case FFI_TYPE_FLOAT:
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if (n_fpr < MAX_FPRARGS)
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n_fpr++;
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else
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n_ov++;
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break;
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/* On 31-bit machines, 64-bit integers are passed in GPR pairs,
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if one is still available, or else on the stack. If only one
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register is free, skip the register (it won't be used for any
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subsequent argument either). */
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#ifndef __s390x__
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case FFI_TYPE_UINT64:
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case FFI_TYPE_SINT64:
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if (n_gpr == MAX_GPRARGS-1)
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n_gpr = MAX_GPRARGS;
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if (n_gpr < MAX_GPRARGS)
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n_gpr += 2;
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else
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n_ov += 2;
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break;
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#endif
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/* Everything else is passed in GPRs (until MAX_GPRARGS
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have been used) or overflows to the stack. */
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default:
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if (n_gpr < MAX_GPRARGS)
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n_gpr++;
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else
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n_ov++;
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break;
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}
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}
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/* Total stack space as required for overflow arguments
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and temporary structure copies. */
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cif->bytes = ROUND_SIZE (n_ov * sizeof (long)) + struct_size;
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return FFI_OK;
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}
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/*======================== End of Routine ============================*/
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/*====================================================================*/
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/* */
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/* Name - ffi_call. */
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/* */
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/* Function - Call the FFI routine. */
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/* */
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/*====================================================================*/
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static void
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ffi_call_int(ffi_cif *cif,
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void (*fn)(void),
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void *rvalue,
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void **avalue,
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void *closure)
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{
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int ret_type = cif->flags;
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size_t rsize = 0, bytes = cif->bytes;
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unsigned char *stack, *p_struct;
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struct call_frame *frame;
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unsigned long *p_ov, *p_gpr;
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unsigned long long *p_fpr;
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int n_fpr, n_gpr, n_ov, i, n;
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ffi_type **arg_types;
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FFI_ASSERT (cif->abi == FFI_SYSV);
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/* If we don't have a return value, we need to fake one. */
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if (rvalue == NULL)
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{
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if (ret_type & FFI390_RET_IN_MEM)
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rsize = cif->rtype->size;
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else
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ret_type = FFI390_RET_VOID;
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}
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/* The stack space will be filled with those areas:
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dummy structure return (highest addresses)
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FPR argument register save area
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GPR argument register save area
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stack frame for ffi_call_SYSV
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temporary struct copies
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overflow argument area (lowest addresses)
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We set up the following pointers:
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p_fpr: bottom of the FPR area (growing upwards)
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p_gpr: bottom of the GPR area (growing upwards)
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p_ov: bottom of the overflow area (growing upwards)
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p_struct: top of the struct copy area (growing downwards)
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All areas are kept aligned to twice the word size.
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Note that we're going to create the stack frame for both
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ffi_call_SYSV _and_ the target function right here. This
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works because we don't make any function calls with more
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than 5 arguments (indeed only memcpy and ffi_call_SYSV),
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and thus we don't have any stacked outgoing parameters. */
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stack = alloca (bytes + sizeof(struct call_frame) + rsize);
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frame = (struct call_frame *)(stack + bytes);
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if (rsize)
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rvalue = frame + 1;
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/* Link the new frame back to the one from this function. */
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frame->back_chain = __builtin_frame_address (0);
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/* Fill in all of the argument stuff. */
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p_ov = (unsigned long *)stack;
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p_struct = (unsigned char *)frame;
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p_gpr = frame->gpr_args;
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p_fpr = frame->fpr_args;
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n_fpr = n_gpr = n_ov = 0;
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/* If we returning a structure then we set the first parameter register
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to the address of where we are returning this structure. */
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if (cif->flags & FFI390_RET_IN_MEM)
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p_gpr[n_gpr++] = (uintptr_t) rvalue;
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/* Now for the arguments. */
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arg_types = cif->arg_types;
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for (i = 0, n = cif->nargs; i < n; ++i)
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{
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ffi_type *ty = arg_types[i];
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void *arg = avalue[i];
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int type = ty->type;
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ffi_arg val;
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restart:
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switch (type)
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{
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case FFI_TYPE_SINT8:
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val = *(SINT8 *)arg;
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goto do_int;
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case FFI_TYPE_UINT8:
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val = *(UINT8 *)arg;
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goto do_int;
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case FFI_TYPE_SINT16:
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val = *(SINT16 *)arg;
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goto do_int;
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case FFI_TYPE_UINT16:
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val = *(UINT16 *)arg;
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goto do_int;
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case FFI_TYPE_INT:
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case FFI_TYPE_SINT32:
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val = *(SINT32 *)arg;
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goto do_int;
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case FFI_TYPE_UINT32:
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val = *(UINT32 *)arg;
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goto do_int;
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case FFI_TYPE_POINTER:
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val = *(uintptr_t *)arg;
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do_int:
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*(n_gpr < MAX_GPRARGS ? p_gpr + n_gpr++ : p_ov + n_ov++) = val;
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break;
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case FFI_TYPE_UINT64:
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case FFI_TYPE_SINT64:
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#ifdef __s390x__
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val = *(UINT64 *)arg;
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goto do_int;
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#else
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if (n_gpr == MAX_GPRARGS-1)
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n_gpr = MAX_GPRARGS;
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if (n_gpr < MAX_GPRARGS)
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p_gpr[n_gpr++] = ((UINT32 *) arg)[0],
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p_gpr[n_gpr++] = ((UINT32 *) arg)[1];
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else
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p_ov[n_ov++] = ((UINT32 *) arg)[0],
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p_ov[n_ov++] = ((UINT32 *) arg)[1];
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#endif
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break;
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case FFI_TYPE_DOUBLE:
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if (n_fpr < MAX_FPRARGS)
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p_fpr[n_fpr++] = *(UINT64 *) arg;
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else
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{
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#ifdef __s390x__
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p_ov[n_ov++] = *(UINT64 *) arg;
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#else
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p_ov[n_ov++] = ((UINT32 *) arg)[0],
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p_ov[n_ov++] = ((UINT32 *) arg)[1];
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#endif
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}
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break;
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case FFI_TYPE_FLOAT:
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val = *(UINT32 *)arg;
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if (n_fpr < MAX_FPRARGS)
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p_fpr[n_fpr++] = (UINT64)val << 32;
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else
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p_ov[n_ov++] = val;
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break;
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case FFI_TYPE_STRUCT:
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/* Check how a structure type is passed. */
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type = ffi_check_struct_type (ty);
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/* Some structures are passed via a type they contain. */
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if (type != FFI_TYPE_POINTER)
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goto restart;
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/* ... otherwise, passed by reference. fallthru. */
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#if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE
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case FFI_TYPE_LONGDOUBLE:
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/* 16-byte long double is passed via reference. */
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#endif
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case FFI_TYPE_COMPLEX:
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/* Complex types are passed via reference. */
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p_struct -= ROUND_SIZE (ty->size);
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memcpy (p_struct, arg, ty->size);
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val = (uintptr_t)p_struct;
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goto do_int;
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default:
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FFI_ASSERT (0);
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break;
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}
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}
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ffi_call_SYSV (frame, ret_type & FFI360_RET_MASK, rvalue, fn, closure);
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}
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void
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ffi_call (ffi_cif *cif, void (*fn)(void), void *rvalue, void **avalue)
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{
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ffi_call_int(cif, fn, rvalue, avalue, NULL);
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}
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void
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ffi_call_go (ffi_cif *cif, void (*fn)(void), void *rvalue,
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void **avalue, void *closure)
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{
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ffi_call_int(cif, fn, rvalue, avalue, closure);
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}
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/*======================== End of Routine ============================*/
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/*====================================================================*/
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/* */
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/* Name - ffi_closure_helper_SYSV. */
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/* */
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/* Function - Call a FFI closure target function. */
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/* */
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/*====================================================================*/
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void FFI_HIDDEN
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ffi_closure_helper_SYSV (ffi_cif *cif,
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void (*fun)(ffi_cif*,void*,void**,void*),
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void *user_data,
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unsigned long *p_gpr,
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unsigned long long *p_fpr,
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unsigned long *p_ov)
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{
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unsigned long long ret_buffer;
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void *rvalue = &ret_buffer;
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void **avalue;
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void **p_arg;
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int n_gpr = 0;
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int n_fpr = 0;
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int n_ov = 0;
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ffi_type **ptr;
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int i;
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/* Allocate buffer for argument list pointers. */
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p_arg = avalue = alloca (cif->nargs * sizeof (void *));
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/* If we returning a structure, pass the structure address
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directly to the target function. Otherwise, have the target
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function store the return value to the GPR save area. */
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if (cif->flags & FFI390_RET_IN_MEM)
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rvalue = (void *) p_gpr[n_gpr++];
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/* Now for the arguments. */
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for (ptr = cif->arg_types, i = cif->nargs; i > 0; i--, p_arg++, ptr++)
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{
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int deref_struct_pointer = 0;
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int type = (*ptr)->type;
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#if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE
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/* 16-byte long double is passed like a struct. */
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if (type == FFI_TYPE_LONGDOUBLE)
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type = FFI_TYPE_STRUCT;
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#endif
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/* Check how a structure type is passed. */
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if (type == FFI_TYPE_STRUCT || type == FFI_TYPE_COMPLEX)
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|
{
|
|
if (type == FFI_TYPE_COMPLEX)
|
|
type = FFI_TYPE_POINTER;
|
|
else
|
|
type = ffi_check_struct_type (*ptr);
|
|
|
|
/* If we pass the struct via pointer, remember to
|
|
retrieve the pointer later. */
|
|
if (type == FFI_TYPE_POINTER)
|
|
deref_struct_pointer = 1;
|
|
}
|
|
|
|
/* Pointers are passed like UINTs of the same size. */
|
|
if (type == FFI_TYPE_POINTER)
|
|
{
|
|
#ifdef __s390x__
|
|
type = FFI_TYPE_UINT64;
|
|
#else
|
|
type = FFI_TYPE_UINT32;
|
|
#endif
|
|
}
|
|
|
|
/* Now handle all primitive int/float data types. */
|
|
switch (type)
|
|
{
|
|
case FFI_TYPE_DOUBLE:
|
|
if (n_fpr < MAX_FPRARGS)
|
|
*p_arg = &p_fpr[n_fpr++];
|
|
else
|
|
*p_arg = &p_ov[n_ov],
|
|
n_ov += sizeof (double) / sizeof (long);
|
|
break;
|
|
|
|
case FFI_TYPE_FLOAT:
|
|
if (n_fpr < MAX_FPRARGS)
|
|
*p_arg = &p_fpr[n_fpr++];
|
|
else
|
|
*p_arg = (char *)&p_ov[n_ov++] + sizeof (long) - 4;
|
|
break;
|
|
|
|
case FFI_TYPE_UINT64:
|
|
case FFI_TYPE_SINT64:
|
|
#ifdef __s390x__
|
|
if (n_gpr < MAX_GPRARGS)
|
|
*p_arg = &p_gpr[n_gpr++];
|
|
else
|
|
*p_arg = &p_ov[n_ov++];
|
|
#else
|
|
if (n_gpr == MAX_GPRARGS-1)
|
|
n_gpr = MAX_GPRARGS;
|
|
if (n_gpr < MAX_GPRARGS)
|
|
*p_arg = &p_gpr[n_gpr], n_gpr += 2;
|
|
else
|
|
*p_arg = &p_ov[n_ov], n_ov += 2;
|
|
#endif
|
|
break;
|
|
|
|
case FFI_TYPE_INT:
|
|
case FFI_TYPE_UINT32:
|
|
case FFI_TYPE_SINT32:
|
|
if (n_gpr < MAX_GPRARGS)
|
|
*p_arg = (char *)&p_gpr[n_gpr++] + sizeof (long) - 4;
|
|
else
|
|
*p_arg = (char *)&p_ov[n_ov++] + sizeof (long) - 4;
|
|
break;
|
|
|
|
case FFI_TYPE_UINT16:
|
|
case FFI_TYPE_SINT16:
|
|
if (n_gpr < MAX_GPRARGS)
|
|
*p_arg = (char *)&p_gpr[n_gpr++] + sizeof (long) - 2;
|
|
else
|
|
*p_arg = (char *)&p_ov[n_ov++] + sizeof (long) - 2;
|
|
break;
|
|
|
|
case FFI_TYPE_UINT8:
|
|
case FFI_TYPE_SINT8:
|
|
if (n_gpr < MAX_GPRARGS)
|
|
*p_arg = (char *)&p_gpr[n_gpr++] + sizeof (long) - 1;
|
|
else
|
|
*p_arg = (char *)&p_ov[n_ov++] + sizeof (long) - 1;
|
|
break;
|
|
|
|
default:
|
|
FFI_ASSERT (0);
|
|
break;
|
|
}
|
|
|
|
/* If this is a struct passed via pointer, we need to
|
|
actually retrieve that pointer. */
|
|
if (deref_struct_pointer)
|
|
*p_arg = *(void **)*p_arg;
|
|
}
|
|
|
|
|
|
/* Call the target function. */
|
|
(fun) (cif, rvalue, avalue, user_data);
|
|
|
|
/* Convert the return value. */
|
|
switch (cif->rtype->type)
|
|
{
|
|
/* Void is easy, and so is struct. */
|
|
case FFI_TYPE_VOID:
|
|
case FFI_TYPE_STRUCT:
|
|
case FFI_TYPE_COMPLEX:
|
|
#if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE
|
|
case FFI_TYPE_LONGDOUBLE:
|
|
#endif
|
|
break;
|
|
|
|
/* Floating point values are returned in fpr 0. */
|
|
case FFI_TYPE_FLOAT:
|
|
p_fpr[0] = (long long) *(unsigned int *) rvalue << 32;
|
|
break;
|
|
|
|
case FFI_TYPE_DOUBLE:
|
|
p_fpr[0] = *(unsigned long long *) rvalue;
|
|
break;
|
|
|
|
/* Integer values are returned in gpr 2 (and gpr 3
|
|
for 64-bit values on 31-bit machines). */
|
|
case FFI_TYPE_UINT64:
|
|
case FFI_TYPE_SINT64:
|
|
#ifdef __s390x__
|
|
p_gpr[0] = *(unsigned long *) rvalue;
|
|
#else
|
|
p_gpr[0] = ((unsigned long *) rvalue)[0],
|
|
p_gpr[1] = ((unsigned long *) rvalue)[1];
|
|
#endif
|
|
break;
|
|
|
|
case FFI_TYPE_POINTER:
|
|
case FFI_TYPE_UINT32:
|
|
case FFI_TYPE_UINT16:
|
|
case FFI_TYPE_UINT8:
|
|
p_gpr[0] = *(unsigned long *) rvalue;
|
|
break;
|
|
|
|
case FFI_TYPE_INT:
|
|
case FFI_TYPE_SINT32:
|
|
case FFI_TYPE_SINT16:
|
|
case FFI_TYPE_SINT8:
|
|
p_gpr[0] = *(signed long *) rvalue;
|
|
break;
|
|
|
|
default:
|
|
FFI_ASSERT (0);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*======================== End of Routine ============================*/
|
|
|
|
/*====================================================================*/
|
|
/* */
|
|
/* Name - ffi_prep_closure_loc. */
|
|
/* */
|
|
/* Function - Prepare a FFI 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)
|
|
{
|
|
static unsigned short const template[] = {
|
|
0x0d10, /* basr %r1,0 */
|
|
#ifndef __s390x__
|
|
0x9801, 0x1006, /* lm %r0,%r1,6(%r1) */
|
|
#else
|
|
0xeb01, 0x100e, 0x0004, /* lmg %r0,%r1,14(%r1) */
|
|
#endif
|
|
0x07f1 /* br %r1 */
|
|
};
|
|
|
|
unsigned long *tramp = (unsigned long *)&closure->tramp;
|
|
|
|
if (cif->abi != FFI_SYSV)
|
|
return FFI_BAD_ABI;
|
|
|
|
memcpy (tramp, template, sizeof(template));
|
|
tramp[2] = (unsigned long)codeloc;
|
|
tramp[3] = (unsigned long)&ffi_closure_SYSV;
|
|
|
|
closure->cif = cif;
|
|
closure->fun = fun;
|
|
closure->user_data = user_data;
|
|
|
|
return FFI_OK;
|
|
}
|
|
|
|
/*======================== End of Routine ============================*/
|
|
|
|
/* Build a Go language closure. */
|
|
|
|
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 = ffi_go_closure_SYSV;
|
|
closure->cif = cif;
|
|
closure->fun = fun;
|
|
|
|
return FFI_OK;
|
|
}
|