src/gras/DataDesc/ddt_convert.c

   1 /* $Id$ */
   2
   3 /* ddt_remote - Stuff needed to get datadescs about remote hosts            */
   4
   5 /* Copyright (c) 2003 Olivier Aumage.                                       */
   6 /* Copyright (c) 2003, 2004 Martin Quinson.                                 */
   7 /* All rights reserved.                                                     */
   8
   9 /* This program is free software; you can redistribute it and/or modify it
  10  * under the terms of the license (GNU LGPL) which comes with this package. */
  11
  12 /************************************************************************/
  13 /* C combines the power of assembler with the portability of assembler. */
  14 /************************************************************************/
  15
  16 #include "gras/DataDesc/datadesc_private.h"
  17
  18 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(gras_ddt_convert,gras_ddt,
  19                 "Inter-architecture convertions");
  20
  21 /***
  22  *** Table of all known architectures:
  23  ***
  24   l_C:1/1:_I:2/2:4/4:4/4:8/8:_P:4/4:4/4:_D:4/4:8/8:) gras_arch=0; gras_arch_name=little32;;
  25   l_C:1/1:_I:2/2:4/4:4/4:8/4:_P:4/4:4/4:_D:4/4:8/4:) gras_arch=1; gras_arch_name=little32_4;;
  26
  27   l_C:1/1:_I:2/2:4/4:8/8:8/8:_P:8/8:8/8:_D:4/4:8/8:) gras_arch=2; gras_arch_name=little64;;
  28
  29   B_C:1/1:_I:2/2:4/4:4/4:8/8:_P:4/4:4/4:_D:4/4:8/8:) gras_arch=3; gras_arch_name=big32;;
  30   B_C:1/1:_I:2/2:4/4:4/4:8/8:_P:4/4:4/4:_D:4/4:8/4:) gras_arch=4; gras_arch_name=big32_8_4;;
  31   B_C:1/1:_I:2/2:4/4:4/4:8/4:_P:4/4:4/4:_D:4/4:8/4:) gras_arch=5; gras_arch_name=big32_4;;
  32   B_C:1/1:_I:2/2:4/2:4/2:8/2:_P:4/2:4/2:_D:4/2:8/2:) gras_arch=6; gras_arch_name=big32_2;;
  33
  34   B_C:1/1:_I:2/2:4/4:8/8:8/8:_P:8/8:8/8:_D:4/4:8/8:) gras_arch=7; gras_arch_name=big64;;
  35
  36  ***/
  37
  38 const gras_arch_desc_t gras_arches[gras_arch_count] = {
  39
  40                 {"little32_1",  0, {1,2,4,4,8,   4,4,   4,8},   /* little endian, 1 byte alignement (win32) */
  41                                 {1,1,1,1,1,   1,1,   1,1}},
  42
  43                                 {"little32_2",  0, {1,2,4,4,8,   4,4,   4,8},   /* little endian, 2 bytes alignements (win32) */
  44                                                 {1,2,2,2,2,   2,2,   2,2}},
  45
  46                                                 {"little32_4",    0, {1,2,4,4,8,   4,4,   4,8},   /* little endian, 4 bytes alignements (win32 and linux x86) */
  47                                                                 {1,2,4,4,4,   4,4,   4,4}},
  48
  49                                                                 {"little32_8",    0, {1,2,4,4,8,   4,4,   4,8},         /* little endian, 8 bytes alignement (win32) */
  50                                                                                 {1,2,4,4,8,   4,4,   4,8}},
  51
  52                                                                                 {"little64",      0, {1,2,4,8,8,   8,8,   4,8}, /* alpha, ia64 */
  53                                                                                                 {1,2,4,8,8,   8,8,   4,8}},
  54
  55                                                                                                 {"big32_8",       1, {1,2,4,4,8,   4,4,   4,8},
  56                                                                                                                 {1,2,4,4,8,   4,4,   4,8}},
  57
  58                                                                                                                 {"big32_8_4",     1, {1,2,4,4,8,   4,4,   4,8}, /* AIX */
  59                                                                                                                                 {1,2,4,4,8,   4,4,   4,4}},
  60
  61                                                                                                                                 {"big32_4",       1, {1,2,4,4,8,   4,4,   4,8}, /* G5 */
  62                                                                                                                                                 {1,2,4,4,4,   4,4,   4,4}},
  63
  64                                                                                                                                                 {"big32_2",       1, {1,2,4,4,8,   4,4,   4,8}, /* ARM */
  65                                                                                                                                                                 {1,2,2,2,2,   2,2,   2,2}},
  66
  67                                                                                                                                                                 {"big64",         1, {1,2,4,8,8,   8,8,   4,8}, /* sparc */
  68                                                                                                                                                                                 {1,2,4,8,8,   8,8,   4,8}},
  69
  70                                                                                                                                                                                 {"big64_8_4",     1, {1,2,4,8,8,   8,8,   4,8}, /* aix with -maix64 */
  71                                                                                                                                                                                                 {1,2,4,8,8,   8,8,   4,4}}
  72 };
  73
  74 const char *gras_datadesc_arch_name(int code) {
  75         if (code < 0 || code >= gras_arch_count)
  76                 return "[unknown arch]";
  77         return gras_arches[code].name;
  78 }
  79
  80
  81 /**
  82  * Local function doing the grunt work
  83  */
  84 static void
  85 gras_dd_reverse_bytes(void *to,
  86                 const void *from,
  87                 size_t length);
  88
  89 /**
  90  * gras_dd_convert_elm:
  91  *
  92  * Convert the element described by @type comming from architecture @r_arch.
  93  * The data to be converted is stored in @src, and is to be stored in @dst.
  94  * Both pointers may be the same location if no resizing is needed.
  95  */
  96 void
  97 gras_dd_convert_elm(gras_datadesc_type_t type, int count,
  98                 int r_arch,
  99                 void *src, void *dst) {
 100         gras_dd_cat_scalar_t scal = type->category.scalar_data;
 101         int cpt;
 102         const void *r_data;
 103         void *l_data;
 104         unsigned long r_size, l_size;
 105         /* Hexadecimal displayer
 106   union {
 107     char c[sizeof(int)];
 108     int i;
 109   } tester;
 110          */
 111
 112         xbt_assert(type->category_code == e_gras_datadesc_type_cat_scalar);
 113         xbt_assert(r_arch != GRAS_THISARCH);
 114
 115         r_size = type->size[r_arch];
 116         l_size = type->size[GRAS_THISARCH];
 117         DEBUG4("r_size=%lu l_size=%lu,    src=%p dst=%p",
 118                         r_size,l_size,src,dst);
 119
 120         DEBUG2("remote=%c local=%c", gras_arches[r_arch].endian?'B':'l',
 121                         gras_arches[GRAS_THISARCH].endian?'B':'l');
 122
 123         if(r_size != l_size) {
 124                 for(cpt = 0, r_data = src, l_data = dst;
 125                 cpt < count;
 126                 cpt++,
 127                 r_data = (char *)r_data + r_size,
 128                 l_data = (char *)l_data + l_size) {
 129
 130                         /*
 131       fprintf(stderr,"r_data=");
 132       for (cpt=0; cpt<r_size; cpt++) {
 133         tester.i=0;
 134         tester.c[0]= ((char*)r_data)[cpt];
 135         fprintf(stderr,"\\%02x", tester.i);
 136       }
 137       fprintf(stderr,"\n");
 138                          */
 139
 140                         /* Resize that damn integer, pal */
 141
 142                         unsigned char *l_sign, *r_sign;
 143                         int padding;
 144                         int sizeChange = l_size - r_size;
 145                         int lowOrderFirst = !gras_arches[r_arch].endian ||
 146                         gras_arches[r_arch].endian == gras_arches[GRAS_THISARCH].endian;
 147
 148                         DEBUG5("Resize integer %d from %lu @%p to %lu @%p",
 149                                         cpt, r_size,r_data, l_size,l_data);
 150                         xbt_assert0(r_data != l_data, "Impossible to resize in place");
 151
 152                         if(sizeChange < 0) {
 153                                 DEBUG3("Truncate %d bytes (%s,%s)", -sizeChange,
 154                                                 lowOrderFirst?"lowOrderFirst":"bigOrderFirst",
 155                                                                 scal.encoding == e_gras_dd_scalar_encoding_sint?"signed":"unsigned");
 156                                 /* Truncate high-order bytes. */
 157                                 memcpy(l_data,
 158                                                 gras_arches[r_arch].endian ? ((char*)r_data-sizeChange)
 159                                                                 :         r_data,
 160                                                                 l_size);
 161
 162                                 if(scal.encoding == e_gras_dd_scalar_encoding_sint) {
 163                                         DEBUG0("This is signed");
 164                                         /* Make sure the high order bit of r_data and l_data are the same */
 165                                         l_sign = gras_arches[GRAS_THISARCH].endian
 166                                         ? ((unsigned char*)l_data + l_size - 1)
 167                                                         :  (unsigned char*)l_data;
 168                                         r_sign = gras_arches[r_arch].endian
 169                                         ? ((unsigned char*)r_data + r_size - 1)
 170                                                         :  (unsigned char*)r_data;
 171                                         DEBUG2("This is signed (r_sign=%c l_sign=%c", *r_sign,*l_sign);
 172
 173                                         if ((*r_sign > 127) != (*l_sign > 127)) {
 174                                                 if(*r_sign > 127)
 175                                                         *l_sign += 128;
 176                                                 else
 177                                                         *l_sign -= 128;
 178                                         }
 179                                 }
 180                         } else {
 181                                 DEBUG1("Extend %d bytes", sizeChange);
 182                                 if (scal.encoding != e_gras_dd_scalar_encoding_sint) {
 183                                         DEBUG0("This is signed");
 184                                         padding = 0; /* pad unsigned with 0 */
 185                                 } else {
 186                                         /* extend sign */
 187                                         r_sign = gras_arches[r_arch].endian ? ((unsigned char*)r_data + r_size - 1)
 188                                                         :  (unsigned char*)r_data;
 189                                         padding = (*r_sign > 127) ? 0xff : 0;
 190                                 }
 191
 192                                 memset(l_data, padding, l_size);
 193                                 memcpy(!gras_arches[r_arch].endian ? l_data : ((char *)l_data + sizeChange),
 194                                                 r_data, r_size);
 195
 196                                 /*
 197         fprintf(stderr,"r_data=");
 198         for (cpt=0; cpt<r_size; cpt++) {
 199           tester.i=0;
 200           tester.c[0] = ((char*)r_data)[cpt];
 201           fprintf(stderr,"\\%02x", tester.i);
 202         }
 203         fprintf(stderr,"\n");
 204
 205         fprintf(stderr,"l_data=");
 206         for (cpt=0; cpt<l_size; cpt++) {
 207           tester.i=0;
 208           tester.c[0]= ((char*)l_data)[cpt];
 209           fprintf(stderr,"\\%02x", tester.i);
 210         } fprintf(stderr,"\n");
 211                                  */
 212                         }
 213                 }
 214         }
 215
 216         /* flip bytes if needed */
 217         if(gras_arches[r_arch].endian != gras_arches[GRAS_THISARCH].endian &&
 218                         (l_size * count)  > 1) {
 219
 220                 for(cpt = 0, r_data=dst, l_data=dst;
 221                 cpt < count;
 222                 cpt++,
 223                 r_data = (char *)r_data + l_size, /* resizing already done */
 224                 l_data = (char *)l_data + l_size) {
 225
 226                         DEBUG1("Flip elm %d",cpt);
 227                         gras_dd_reverse_bytes(l_data, r_data, l_size);
 228                 }
 229         }
 230
 231 }
 232
 233 static void
 234 gras_dd_reverse_bytes(void *to,
 235                 const void *from,
 236                 size_t length) {
 237
 238         char charBegin;
 239         const char *fromBegin;
 240         const char *fromEnd;
 241         char *toBegin;
 242         char *toEnd;
 243
 244         for(fromBegin = (const char *)from,
 245                         fromEnd = fromBegin + length - 1,
 246                         toBegin = (char *)to,
 247                         toEnd = toBegin + length - 1;
 248
 249         fromBegin <= fromEnd;
 250
 251         fromBegin++, fromEnd--,
 252         toBegin++, toEnd--) {
 253
 254                 charBegin = *fromBegin;
 255                 *toBegin = *fromEnd;
 256                 *toEnd = charBegin;
 257         }
 258 }
 259
 260
 261 /**
 262  * gras_arch_selfid:
 263  *
 264  * returns the ID of the architecture the process is running on
 265  */
 266 int
 267 gras_arch_selfid(void) {
 268         return GRAS_THISARCH;
 269 }