arch/m32r/include/asm/flat.h

   1 /*
   2  * include/asm-m32r/flat.h
   3  *
   4  * uClinux flat-format executables
   5  *
   6  * Copyright (C) 2004  Kazuhiro Inaoka
   7  *
   8  * This file is subject to the terms and conditions of the GNU General Public
   9  * License.  See the file "COPYING" in the main directory of this archive for
  10  * more details.
  11  */
  12 #ifndef __ASM_M32R_FLAT_H
  13 #define __ASM_M32R_FLAT_H
  14
  15 #define flat_stack_align(sp)            (*sp += (*sp & 3 ? (4 - (*sp & 3)): 0))
  16 #define flat_argvp_envp_on_stack()              0
  17 #define flat_old_ram_flag(flags)                (flags)
  18 #define flat_set_persistent(relval, p)          0
  19 #define flat_reloc_valid(reloc, size)           \
  20         (((reloc) - textlen_for_m32r_lo16_data) <= (size))
  21 #define flat_get_addr_from_rp(rp, relval, flags, persistent) \
  22         m32r_flat_get_addr_from_rp(rp, relval, (text_len) )
  23
  24 #define flat_put_addr_at_rp(rp, addr, relval) \
  25         m32r_flat_put_addr_at_rp(rp, addr, relval)
  26
  27 /* Convert a relocation entry into an address.  */
  28 static inline unsigned long
  29 flat_get_relocate_addr (unsigned long relval)
  30 {
  31         return relval & 0x00ffffff; /* Mask out top 8-bits */
  32 }
  33
  34 #define flat_m32r_get_reloc_type(relval)        ((relval) >> 24)
  35
  36 #define M32R_SETH_OPCODE        0xd0c00000 /* SETH instruction code */
  37
  38 #define FLAT_M32R_32            0x00    /* 32bits reloc */
  39 #define FLAT_M32R_24            0x01    /* unsigned 24bits reloc */
  40 #define FLAT_M32R_16            0x02    /* 16bits reloc */
  41 #define FLAT_M32R_LO16          0x03    /* signed low 16bits reloc (low()) */
  42 #define FLAT_M32R_LO16_DATA     0x04    /* signed low 16bits reloc (low())
  43                                            for a symbol in .data section */
  44                                         /* High 16bits of an address used
  45                                            when the lower 16bbits are treated
  46                                            as unsigned.
  47                                            To create SETH instruction only.
  48                                            0x1X: X means a number of register.
  49                                            0x10 - 0x3F are reserved. */
  50 #define FLAT_M32R_HI16_ULO      0x10    /* reloc for SETH Rn,#high(imm16) */
  51                                         /* High 16bits of an address used
  52                                            when the lower 16bbits are treated
  53                                            as signed.
  54                                            To create SETH instruction only.
  55                                            0x2X: X means a number of register.
  56                                            0x20 - 0x4F are reserved. */
  57 #define FLAT_M32R_HI16_SLO      0x20    /* reloc for SETH Rn,#shigh(imm16) */
  58
  59 static unsigned long textlen_for_m32r_lo16_data = 0;
  60
  61 static inline unsigned long m32r_flat_get_addr_from_rp (unsigned long *rp,
  62                                                         unsigned long relval,
  63                                                         unsigned long textlen)
  64 {
  65         unsigned int reloc = flat_m32r_get_reloc_type (relval);
  66         textlen_for_m32r_lo16_data = 0;
  67         if (reloc & 0xf0) {
  68                 unsigned long addr = htonl(*rp);
  69                 switch (reloc & 0xf0)
  70                 {
  71                 case FLAT_M32R_HI16_ULO:
  72                 case FLAT_M32R_HI16_SLO:
  73                         if (addr == 0) {
  74                                 /* put "seth Rn,#0x0" instead of 0 (addr). */
  75                                 *rp = (M32R_SETH_OPCODE | ((reloc & 0x0f)<<24));
  76                         }
  77                         return addr;
  78                 default:
  79                         break;
  80                 }
  81         } else {
  82                 switch (reloc)
  83                 {
  84                 case FLAT_M32R_LO16:
  85                         return htonl(*rp) & 0xFFFF;
  86                 case FLAT_M32R_LO16_DATA:
  87                         /* FIXME: The return value will decrease by textlen
  88                            at m32r_flat_put_addr_at_rp () */
  89                         textlen_for_m32r_lo16_data = textlen;
  90                         return (htonl(*rp) & 0xFFFF) + textlen;
  91                 case FLAT_M32R_16:
  92                         return htons(*(unsigned short *)rp) & 0xFFFF;
  93                 case FLAT_M32R_24:
  94                         return htonl(*rp) & 0xFFFFFF;
  95                 case FLAT_M32R_32:
  96                         return htonl(*rp);
  97                 default:
  98                         break;
  99                 }
 100         }
 101         return ~0;      /* bogus value */
 102 }
 103
 104 static inline void m32r_flat_put_addr_at_rp (unsigned long *rp,
 105                                              unsigned long addr,
 106                                              unsigned long relval)
 107 {
 108         unsigned int reloc = flat_m32r_get_reloc_type (relval);
 109         if (reloc & 0xf0) {
 110                 unsigned long Rn = reloc & 0x0f; /* get a number of register */
 111                 Rn <<= 24; /* 0x0R000000 */
 112                 reloc &= 0xf0;
 113                 switch (reloc)
 114                 {
 115                 case FLAT_M32R_HI16_ULO: /* To create SETH Rn,#high(imm16) */
 116                         *rp = (M32R_SETH_OPCODE | Rn
 117                                | ((addr >> 16) & 0xFFFF));
 118                         break;
 119                 case FLAT_M32R_HI16_SLO: /* To create SETH Rn,#shigh(imm16) */
 120                         *rp = (M32R_SETH_OPCODE | Rn
 121                                | (((addr >> 16) + ((addr & 0x8000) ? 1 : 0))
 122                                   & 0xFFFF));
 123                         break;
 124                 }
 125         } else {
 126                 switch (reloc) {
 127                 case FLAT_M32R_LO16_DATA:
 128                         addr -= textlen_for_m32r_lo16_data;
 129                         textlen_for_m32r_lo16_data = 0;
 130                 case FLAT_M32R_LO16:
 131                         *rp = (htonl(*rp) & 0xFFFF0000) | (addr & 0xFFFF);
 132                         break;
 133                 case FLAT_M32R_16:
 134                         *(unsigned short *)rp = addr & 0xFFFF;
 135                         break;
 136                 case FLAT_M32R_24:
 137                         *rp = (htonl(*rp) & 0xFF000000) | (addr & 0xFFFFFF);
 138                         break;
 139                 case FLAT_M32R_32:
 140                         *rp = addr;
 141                         break;
 142                 }
 143         }
 144 }
 145
 146 #endif /* __ASM_M32R_FLAT_H */