1 /* ----------------------------------------------------------------------- 2 prep_cif.c - Copyright (c) 2011, 2012 Anthony Green 3 Copyright (c) 1996, 1998, 2007 Red Hat, Inc. 4 5 Permission is hereby granted, free of charge, to any person obtaining 6 a copy of this software and associated documentation files (the 7 ``Software''), to deal in the Software without restriction, including 8 without limitation the rights to use, copy, modify, merge, publish, 9 distribute, sublicense, and/or sell copies of the Software, and to 10 permit persons to whom the Software is furnished to do so, subject to 11 the following conditions: 12 13 The above copyright notice and this permission notice shall be included 14 in all copies or substantial portions of the Software. 15 16 THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND, 17 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 18 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 19 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT 20 HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, 21 WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 22 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 23 DEALINGS IN THE SOFTWARE. 24 ----------------------------------------------------------------------- */ 25 26 #include <ffi.h> 27 #include <ffi_common.h> 28 #include <stdlib.h> 29 30 /* Round up to FFI_SIZEOF_ARG. */ 31 32 #define STACK_ARG_SIZE(x) ALIGN(x, FFI_SIZEOF_ARG) 33 34 /* Perform machine independent initialization of aggregate type 35 specifications. */ 36 37 static ffi_status initialize_aggregate(ffi_type *arg) 38 { 39 ffi_type **ptr; 40 41 if (UNLIKELY(arg == NULL || arg->elements == NULL)) 42 return FFI_BAD_TYPEDEF; 43 44 arg->size = 0; 45 arg->alignment = 0; 46 47 ptr = &(arg->elements[0]); 48 49 if (UNLIKELY(ptr == 0)) 50 return FFI_BAD_TYPEDEF; 51 52 while ((*ptr) != NULL) 53 { 54 if (UNLIKELY(((*ptr)->size == 0) 55 && (initialize_aggregate((*ptr)) != FFI_OK))) 56 return FFI_BAD_TYPEDEF; 57 58 /* Perform a sanity check on the argument type */ 59 FFI_ASSERT_VALID_TYPE(*ptr); 60 61 arg->size = ALIGN(arg->size, (*ptr)->alignment); 62 arg->size += (*ptr)->size; 63 64 arg->alignment = (arg->alignment > (*ptr)->alignment) ? 65 arg->alignment : (*ptr)->alignment; 66 67 ptr++; 68 } 69 70 /* Structure size includes tail padding. This is important for 71 structures that fit in one register on ABIs like the PowerPC64 72 Linux ABI that right justify small structs in a register. 73 It's also needed for nested structure layout, for example 74 struct A { long a; char b; }; struct B { struct A x; char y; }; 75 should find y at an offset of 2*sizeof(long) and result in a 76 total size of 3*sizeof(long). */ 77 arg->size = ALIGN (arg->size, arg->alignment); 78 79 /* On some targets, the ABI defines that structures have an additional 80 alignment beyond the "natural" one based on their elements. */ 81 #ifdef FFI_AGGREGATE_ALIGNMENT 82 if (FFI_AGGREGATE_ALIGNMENT > arg->alignment) 83 arg->alignment = FFI_AGGREGATE_ALIGNMENT; 84 #endif 85 86 if (arg->size == 0) 87 return FFI_BAD_TYPEDEF; 88 else 89 return FFI_OK; 90 } 91 92 #ifndef __CRIS__ 93 /* The CRIS ABI specifies structure elements to have byte 94 alignment only, so it completely overrides this functions, 95 which assumes "natural" alignment and padding. */ 96 97 /* Perform machine independent ffi_cif preparation, then call 98 machine dependent routine. */ 99 100 /* For non variadic functions isvariadic should be 0 and 101 nfixedargs==ntotalargs. 102 103 For variadic calls, isvariadic should be 1 and nfixedargs 104 and ntotalargs set as appropriate. nfixedargs must always be >=1 */ 105 106 107 ffi_status FFI_HIDDEN ffi_prep_cif_core(ffi_cif *cif, ffi_abi abi, 108 unsigned int isvariadic, 109 unsigned int nfixedargs, 110 unsigned int ntotalargs, 111 ffi_type *rtype, ffi_type **atypes) 112 { 113 unsigned bytes = 0; 114 unsigned int i; 115 ffi_type **ptr; 116 117 FFI_ASSERT(cif != NULL); 118 FFI_ASSERT((!isvariadic) || (nfixedargs >= 1)); 119 FFI_ASSERT(nfixedargs <= ntotalargs); 120 121 if (! (abi > FFI_FIRST_ABI && abi < FFI_LAST_ABI)) 122 return FFI_BAD_ABI; 123 124 cif->abi = abi; 125 cif->arg_types = atypes; 126 cif->nargs = ntotalargs; 127 cif->rtype = rtype; 128 129 cif->flags = 0; 130 131 #if HAVE_LONG_DOUBLE_VARIANT 132 ffi_prep_types (abi); 133 #endif 134 135 /* Initialize the return type if necessary */ 136 if ((cif->rtype->size == 0) && (initialize_aggregate(cif->rtype) != FFI_OK)) 137 return FFI_BAD_TYPEDEF; 138 139 /* Perform a sanity check on the return type */ 140 FFI_ASSERT_VALID_TYPE(cif->rtype); 141 142 /* x86, x86-64 and s390 stack space allocation is handled in prep_machdep. */ 143 #if !defined M68K && !defined X86_ANY && !defined S390 && !defined PA 144 /* Make space for the return structure pointer */ 145 if (cif->rtype->type == FFI_TYPE_STRUCT 146 #ifdef SPARC 147 && (cif->abi != FFI_V9 || cif->rtype->size > 32) 148 #endif 149 #ifdef TILE 150 && (cif->rtype->size > 10 * FFI_SIZEOF_ARG) 151 #endif 152 #ifdef XTENSA 153 && (cif->rtype->size > 16) 154 #endif 155 #ifdef NIOS2 156 && (cif->rtype->size > 8) 157 #endif 158 ) 159 bytes = STACK_ARG_SIZE(sizeof(void*)); 160 #endif 161 162 for (ptr = cif->arg_types, i = cif->nargs; i > 0; i--, ptr++) 163 { 164 165 /* Initialize any uninitialized aggregate type definitions */ 166 if (((*ptr)->size == 0) && (initialize_aggregate((*ptr)) != FFI_OK)) 167 return FFI_BAD_TYPEDEF; 168 169 /* Perform a sanity check on the argument type, do this 170 check after the initialization. */ 171 FFI_ASSERT_VALID_TYPE(*ptr); 172 173 #if !defined X86_ANY && !defined S390 && !defined PA 174 #ifdef SPARC 175 if (((*ptr)->type == FFI_TYPE_STRUCT 176 && ((*ptr)->size > 16 || cif->abi != FFI_V9)) 177 || ((*ptr)->type == FFI_TYPE_LONGDOUBLE 178 && cif->abi != FFI_V9)) 179 bytes += sizeof(void*); 180 else 181 #endif 182 { 183 /* Add any padding if necessary */ 184 if (((*ptr)->alignment - 1) & bytes) 185 bytes = (unsigned)ALIGN(bytes, (*ptr)->alignment); 186 187 #ifdef TILE 188 if (bytes < 10 * FFI_SIZEOF_ARG && 189 bytes + STACK_ARG_SIZE((*ptr)->size) > 10 * FFI_SIZEOF_ARG) 190 { 191 /* An argument is never split between the 10 parameter 192 registers and the stack. */ 193 bytes = 10 * FFI_SIZEOF_ARG; 194 } 195 #endif 196 #ifdef XTENSA 197 if (bytes <= 6*4 && bytes + STACK_ARG_SIZE((*ptr)->size) > 6*4) 198 bytes = 6*4; 199 #endif 200 201 bytes += STACK_ARG_SIZE((*ptr)->size); 202 } 203 #endif 204 } 205 206 cif->bytes = bytes; 207 208 /* Perform machine dependent cif processing */ 209 #ifdef FFI_TARGET_SPECIFIC_VARIADIC 210 if (isvariadic) 211 return ffi_prep_cif_machdep_var(cif, nfixedargs, ntotalargs); 212 #endif 213 214 return ffi_prep_cif_machdep(cif); 215 } 216 #endif /* not __CRIS__ */ 217 218 ffi_status ffi_prep_cif(ffi_cif *cif, ffi_abi abi, unsigned int nargs, 219 ffi_type *rtype, ffi_type **atypes) 220 { 221 return ffi_prep_cif_core(cif, abi, 0, nargs, nargs, rtype, atypes); 222 } 223 224 ffi_status ffi_prep_cif_var(ffi_cif *cif, 225 ffi_abi abi, 226 unsigned int nfixedargs, 227 unsigned int ntotalargs, 228 ffi_type *rtype, 229 ffi_type **atypes) 230 { 231 return ffi_prep_cif_core(cif, abi, 1, nfixedargs, ntotalargs, rtype, atypes); 232 } 233 234 #if FFI_CLOSURES 235 236 ffi_status 237 ffi_prep_closure (ffi_closure* closure, 238 ffi_cif* cif, 239 void (*fun)(ffi_cif*,void*,void**,void*), 240 void *user_data) 241 { 242 return ffi_prep_closure_loc (closure, cif, fun, user_data, closure); 243 } 244 245 #endif 246
