libexec/ld.aout_so/arch/arm32/md.h

   1 /*      $NetBSD: md.h,v 1.4 2000/05/28 01:53:05 matt Exp $      */
   2
   3 /*
   4  * Copyright (c) 1997 Mark Brinicombe
   5  * Copyright (c) 1997 Causality Limited
   6  * Copyright (c) 1993 Paul Kranenburg
   7  * All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. All advertising materials mentioning features or use of this software
  18  *    must display the following acknowledgement:
  19  *      This product includes software developed by Paul Kranenburg.
  20  *      This product includes software developed by Causality Limited
  21  * 4. The name of the author may not be used to endorse or promote products
  22  *    derived from this software without specific prior written permission
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  25  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  26  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  27  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  28  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  29  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  30  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  31  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  32  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  33  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34  */
  35
  36 /* Second cut for arm32 */
  37
  38 #if defined(CROSS_LINKER) && defined(XHOST) && XHOST==sparc
  39 #define NEED_SWAP
  40 #endif
  41
  42 #define MAX_ALIGNMENT           (sizeof (long))
  43
  44 #ifdef NetBSD
  45 #define PAGSIZ                  AOUT_LDPGSZ
  46 #else
  47 #define PAGSIZ                  4096
  48 #endif
  49
  50 #define N_SET_FLAG(ex,f)        (N_SETMAGIC(ex,                 \
  51                                            N_GETMAGIC(ex),      \
  52                                            MID_MACHINE,         \
  53                                            N_GETFLAG(ex)|(f)))
  54
  55 #define N_IS_DYNAMIC(ex)        ((N_GETFLAG(ex) & EX_DYNAMIC))
  56
  57 #define N_BADMID(ex)            (N_GETMID(ex) != MID_MACHINE)
  58
  59 /*
  60  * Should be handled by a.out.h ?
  61  */
  62 #define N_ADJUST(ex)            (((ex).a_entry < PAGSIZ) ? -PAGSIZ : 0)
  63 #ifdef  __notyet__
  64 #define TEXT_START(ex)          (N_TXTADDR(ex) + N_ADJUST(ex))
  65 #define DATA_START(ex)          (N_DATADDR(ex) + N_ADJUST(ex))
  66 #else
  67 #define TEXT_START(ex)          ((ex).a_entry < PAGSIZ ? 0 : 0x001000)
  68 #define DATA_START(ex)          (N_GETMAGIC(ex) == OMAGIC \
  69          ? TEXT_START(ex) + (ex).a_text \
  70          : (TEXT_START(ex) + (ex).a_text + AOUT_LDPGSZ - 1) & ~(AOUT_LDPGSZ - 1))
  71 #endif
  72
  73 #define RELOC_STATICS_THROUGH_GOT_P(r)          (1)
  74 #define JMPSLOT_NEEDS_RELOC                     (1)
  75 #define JMPSLOT_NONEXTERN_IS_INTERMODULE        (0)
  76
  77 #define md_got_reloc(r)                 (-r->r_address)
  78
  79 #define md_get_rt_segment_addend(r,a)   md_get_addend(r,a)
  80
  81 /* Width of a Global Offset Table entry */
  82 #define GOT_ENTRY_SIZE  4
  83 typedef long    got_t;
  84
  85 typedef struct jmpslot {
  86         u_long  opcode1;        /* ldr ip, [pc] */
  87         u_long  opcode2;        /* add pc, pc, ip */
  88         u_long  address;        /* binder/function address */
  89         u_long  reloc_index;    /* relocation index */
  90 #define JMPSLOT_RELOC_MASK      0xffffffff
  91 } jmpslot_t;
  92
  93 #define SAVEPC  0xe1a0c00e      /* MOV ip, lr */
  94 #define CALL    0xeb000000      /* CALL opcode */
  95 #define JUMP    0xe59ff000      /* LDR pc, [pc] (used as JMP) */
  96 #define TRAP    0xe6000011      /* Undefined Instruction (used for bpt) */
  97
  98 #define GETSLOTADDR     0xe04fc00c      /* sub ip, pc, ip */
  99 #define ADDPC           0xe08ff00c      /* add pc, pc, ip */
 100 #define LDRPCADDR       0xe51ff004      /* ldr pc, [pc, #-4] */
 101 #define GETRELADDR      0xe59fc000      /* ldr ip, [pc] */
 102
 103
 104 void    md_swapin_reloc __P((struct relocation_info *, int));
 105 void    md_swapout_reloc __P((struct relocation_info *, int));
 106
 107 /*
 108  * Byte swap defs for cross linking
 109  */
 110
 111 #if !defined(NEED_SWAP)
 112
 113 #define md_swapin_exec_hdr(h)
 114 #define md_swapout_exec_hdr(h)
 115 #define md_swapin_symbols(s,n)
 116 #define md_swapout_symbols(s,n)
 117 #define md_swapin_zsymbols(s,n)
 118 #define md_swapout_zsymbols(s,n)
 119 #define md_swapin__dynamic(l)
 120 #define md_swapout__dynamic(l)
 121 #define md_swapin_section_dispatch_table(l)
 122 #define md_swapout_section_dispatch_table(l)
 123 #define md_swapin_so_debug(d)
 124 #define md_swapout_so_debug(d)
 125 #define md_swapin_rrs_hash(f,n)
 126 #define md_swapout_rrs_hash(f,n)
 127 #define md_swapin_sod(l,n)
 128 #define md_swapout_sod(l,n)
 129 #define md_swapout_jmpslot(j,n)
 130 #define md_swapout_got(g,n)
 131 #define md_swapin_ranlib_hdr(h,n)
 132 #define md_swapout_ranlib_hdr(h,n)
 133
 134 #endif /* NEED_SWAP */
 135
 136 #ifdef CROSS_LINKER
 137
 138 #define get_byte(p)     ( ((unsigned char *)(p))[0] )
 139
 140 #define get_short(p)    ( ( ((unsigned char *)(p))[0] << 8) | \
 141                           ( ((unsigned char *)(p))[1]     )   \
 142                         )
 143
 144 #define get_long(p)     ( ( ((unsigned char *)(p))[0] << 24) | \
 145                           ( ((unsigned char *)(p))[1] << 16) | \
 146                           ( ((unsigned char *)(p))[2] << 8 ) | \
 147                           ( ((unsigned char *)(p))[3]      )   \
 148                         )
 149
 150 #define put_byte(p, v)  { ((unsigned char *)(p))[0] = ((unsigned long)(v)); }
 151
 152 #define put_short(p, v) { ((unsigned char *)(p))[0] =                   \
 153                                 ((((unsigned long)(v)) >> 8) & 0xff);   \
 154                           ((unsigned char *)(p))[1] =                   \
 155                                 ((((unsigned long)(v))     ) & 0xff); }
 156
 157 #define put_long(p, v)  { ((unsigned char *)(p))[0] =                   \
 158                                 ((((unsigned long)(v)) >> 24) & 0xff);  \
 159                           ((unsigned char *)(p))[1] =                   \
 160                                 ((((unsigned long)(v)) >> 16) & 0xff);  \
 161                           ((unsigned char *)(p))[2] =                   \
 162                                 ((((unsigned long)(v)) >>  8) & 0xff);  \
 163                           ((unsigned char *)(p))[3] =                   \
 164                                 ((((unsigned long)(v))      ) & 0xff); }
 165
 166 #ifdef NEED_SWAP
 167
 168 /* Define IO byte swapping routines */
 169
 170 void    md_swapin_exec_hdr __P((struct exec *));
 171 void    md_swapout_exec_hdr __P((struct exec *));
 172 void    md_swapout_jmpslot __P((jmpslot_t *, int));
 173
 174 #define md_swapin_symbols(s,n)                  swap_symbols(s,n)
 175 #define md_swapout_symbols(s,n)                 swap_symbols(s,n)
 176 #define md_swapin_zsymbols(s,n)                 swap_zsymbols(s,n)
 177 #define md_swapout_zsymbols(s,n)                swap_zsymbols(s,n)
 178 #define md_swapin__dynamic(l)                   swap__dynamic(l)
 179 #define md_swapout__dynamic(l)                  swap__dynamic(l)
 180 #define md_swapin_section_dispatch_table(l)     swap_section_dispatch_table(l)
 181 #define md_swapout_section_dispatch_table(l)    swap_section_dispatch_table(l)
 182 #define md_swapin_so_debug(d)                   swap_so_debug(d)
 183 #define md_swapout_so_debug(d)                  swap_so_debug(d)
 184 #define md_swapin_rrs_hash(f,n)                 swap_rrs_hash(f,n)
 185 #define md_swapout_rrs_hash(f,n)                swap_rrs_hash(f,n)
 186 #define md_swapin_sod(l,n)                      swapin_sod(l,n)
 187 #define md_swapout_sod(l,n)                     swapout_sod(l,n)
 188 #define md_swapout_got(g,n)                     swap_longs((long*)(g),n)
 189 #define md_swapin_ranlib_hdr(h,n)               swap_ranlib_hdr(h,n)
 190 #define md_swapout_ranlib_hdr(h,n)              swap_ranlib_hdr(h,n)
 191
 192 #define md_swap_short(x) ( (((x) >> 8) & 0xff) | (((x) & 0xff) << 8) )
 193
 194 #define md_swap_long(x) ( (((x) >> 24) & 0xff    ) | (((x) >> 8 ) & 0xff00   ) | \
 195                         (((x) << 8 ) & 0xff0000) | (((x) << 24) & 0xff000000))
 196
 197 #else   /* We need not swap, but must pay attention to alignment: */
 198
 199 #define md_swap_short(x)        (x)
 200 #define md_swap_long(x)         (x)
 201
 202 #endif /* NEED_SWAP */
 203
 204 #else   /* Not a cross linker: use native */
 205
 206 #define md_swap_short(x)                (x)
 207 #define md_swap_long(x)                 (x)
 208
 209 #define get_byte(where)                 (*(char *)(where))
 210 #define get_short(where)                (*(short *)(where))
 211 #define get_long(where)                 (*(long *)(where))
 212
 213 #define put_byte(where,what)            (*(char *)(where) = (what))
 214 #define put_short(where,what)           (*(short *)(where) = (what))
 215 #define put_long(where,what)            (*(long *)(where) = (what))
 216
 217 #endif /* CROSS_LINKER */
 218
 219 /*
 220  * Define all the RELOC_ macros
 221  */
 222 #define RELOC_ADDRESS(r)                ((r)->r_address)
 223 #define RELOC_EXTERN_P(r)               ((r)->r_extern)
 224 #define RELOC_TYPE(r)                   ((r)->r_symbolnum)
 225 #define RELOC_SYMBOL(r)                 ((r)->r_symbolnum)
 226 /* #define RELOC_MEMORY_SUB_P(r)                ((r)->r_neg)    not used */
 227 #define RELOC_MEMORY_ADD_P(r)           1
 228 #undef RELOC_ADD_EXTRA
 229 #define RELOC_PCREL_P(r)                (((r)->r_pcrel == 1) ^ ((r)->r_length == 3))
 230 #define RELOC_VALUE_RIGHTSHIFT(r)       0
 231 /*#define RELOC_TARGET_SIZE(r)          ((r)->r_length)         not used */
 232 /*#define RELOC_TARGET_BITPOS(r)                0               not used */
 233 /*#define RELOC_TARGET_BITSIZE(r)               32              not used */
 234
 235 #define RELOC_JMPTAB_P(r)               ((r)->r_jmptable)
 236 #define RELOC_BASEREL_P(r)              ((r)->r_baserel)
 237 #define RELOC_RELATIVE_P(r)             ((r)->r_relative)
 238 #define RELOC_COPY_P(r)                 (0)
 239 #define RELOC_LAZY_P(r)                 ((r)->r_jmptable)
 240
 241 /*#define CHECK_GOT_RELOC(r)            RELOC_PCREL_P(r)*/
 242 #define CHECK_GOT_RELOC(r)              (((r)->r_pcrel == 1) && ((r)->r_length == 2))
 243
 244 /*
 245  * Define the range of usable Global Offset Table offsets
 246  * when using arm LDR instructions with 12 bit offset (-4092 -> 4092);
 247  * this is the case if the object files are compiles with -fpic'.
 248  * IF a "large" model is used (i.e. -fPIC'), .word instructions
 249  * are generated instead providing 32-bit addressability of the GOT table.
 250  */
 251
 252 #define MAX_GOTOFF(t)           ((t) == PIC_TYPE_SMALL ? 4092 : LONG_MAX)
 253 #define MIN_GOTOFF(t)           ((t) == PIC_TYPE_SMALL ? -4092 : LONG_MIN)
 254
 255 #define RELOC_PIC_TYPE(r)               ((r)->r_baserel ? \
 256                                                 ((r)->r_length == 1 ? \
 257                                                 PIC_TYPE_SMALL : \
 258                                                 PIC_TYPE_LARGE) : \
 259                                                 PIC_TYPE_NONE)
 260
 261 #define RELOC_INIT_SEGMENT_RELOC(r)