1 /* ----------------------------------------------------------------------- 2 ffi.c - Copyright (C) 2013 IBM 3 Copyright (C) 2011 Anthony Green 4 Copyright (C) 2011 Kyle Moffett 5 Copyright (C) 2008 Red Hat, Inc 6 Copyright (C) 2007, 2008 Free Software Foundation, Inc 7 Copyright (c) 1998 Geoffrey Keating 8 9 PowerPC Foreign Function Interface 10 11 Permission is hereby granted, free of charge, to any person obtaining 12 a copy of this software and associated documentation files (the 13 ``Software''), to deal in the Software without restriction, including 14 without limitation the rights to use, copy, modify, merge, publish, 15 distribute, sublicense, and/or sell copies of the Software, and to 16 permit persons to whom the Software is furnished to do so, subject to 17 the following conditions: 18 19 The above copyright notice and this permission notice shall be included 20 in all copies or substantial portions of the Software. 21 22 THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND, EXPRESS 23 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 24 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 25 IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR 26 OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 27 ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 28 OTHER DEALINGS IN THE SOFTWARE. 29 ----------------------------------------------------------------------- */ 30 31 #include "ffi.h" 32 #include "ffi_common.h" 33 #include "ffi_powerpc.h" 34 35 #if HAVE_LONG_DOUBLE_VARIANT 36 /* Adjust ffi_type_longdouble. */ 37 void FFI_HIDDEN 38 ffi_prep_types (ffi_abi abi) 39 { 40 # if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE 41 # ifdef POWERPC64 42 ffi_prep_types_linux64 (abi); 43 # else 44 ffi_prep_types_sysv (abi); 45 # endif 46 # endif 47 } 48 #endif 49 50 /* Perform machine dependent cif processing */ 51 ffi_status FFI_HIDDEN 52 ffi_prep_cif_machdep (ffi_cif *cif) 53 { 54 #ifdef POWERPC64 55 return ffi_prep_cif_linux64 (cif); 56 #else 57 return ffi_prep_cif_sysv (cif); 58 #endif 59 } 60 61 ffi_status FFI_HIDDEN 62 ffi_prep_cif_machdep_var (ffi_cif *cif, 63 unsigned int nfixedargs MAYBE_UNUSED, 64 unsigned int ntotalargs MAYBE_UNUSED) 65 { 66 #ifdef POWERPC64 67 return ffi_prep_cif_linux64_var (cif, nfixedargs, ntotalargs); 68 #else 69 return ffi_prep_cif_sysv (cif); 70 #endif 71 } 72 73 void 74 ffi_call(ffi_cif *cif, void (*fn)(void), void *rvalue, void **avalue) 75 { 76 /* The final SYSV ABI says that structures smaller or equal 8 bytes 77 are returned in r3/r4. A draft ABI used by linux instead returns 78 them in memory. 79 80 We bounce-buffer SYSV small struct return values so that sysv.S 81 can write r3 and r4 to memory without worrying about struct size. 82 83 For ELFv2 ABI, use a bounce buffer for homogeneous structs too, 84 for similar reasons. */ 85 unsigned long smst_buffer[8]; 86 extended_cif ecif; 87 88 ecif.cif = cif; 89 ecif.avalue = avalue; 90 91 ecif.rvalue = rvalue; 92 if ((cif->flags & FLAG_RETURNS_SMST) != 0) 93 ecif.rvalue = smst_buffer; 94 /* Ensure that we have a valid struct return value. 95 FIXME: Isn't this just papering over a user problem? */ 96 else if (!rvalue && cif->rtype->type == FFI_TYPE_STRUCT) 97 ecif.rvalue = alloca (cif->rtype->size); 98 99 #ifdef POWERPC64 100 ffi_call_LINUX64 (&ecif, -(long) cif->bytes, cif->flags, ecif.rvalue, fn); 101 #else 102 ffi_call_SYSV (&ecif, -cif->bytes, cif->flags, ecif.rvalue, fn); 103 #endif 104 105 /* Check for a bounce-buffered return value */ 106 if (rvalue && ecif.rvalue == smst_buffer) 107 { 108 unsigned int rsize = cif->rtype->size; 109 #ifndef __LITTLE_ENDIAN__ 110 /* The SYSV ABI returns a structure of up to 4 bytes in size 111 left-padded in r3. */ 112 # ifndef POWERPC64 113 if (rsize <= 4) 114 memcpy (rvalue, (char *) smst_buffer + 4 - rsize, rsize); 115 else 116 # endif 117 /* The SYSV ABI returns a structure of up to 8 bytes in size 118 left-padded in r3/r4, and the ELFv2 ABI similarly returns a 119 structure of up to 8 bytes in size left-padded in r3. */ 120 if (rsize <= 8) 121 memcpy (rvalue, (char *) smst_buffer + 8 - rsize, rsize); 122 else 123 #endif 124 memcpy (rvalue, smst_buffer, rsize); 125 } 126 } 127 128 129 ffi_status 130 ffi_prep_closure_loc (ffi_closure *closure, 131 ffi_cif *cif, 132 void (*fun) (ffi_cif *, void *, void **, void *), 133 void *user_data, 134 void *codeloc) 135 { 136 #ifdef POWERPC64 137 return ffi_prep_closure_loc_linux64 (closure, cif, fun, user_data, codeloc); 138 #else 139 return ffi_prep_closure_loc_sysv (closure, cif, fun, user_data, codeloc); 140 #endif 141 } 142
