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_argvp_envp_on_stack()              0
  16 #define flat_old_ram_flag(flags)                (flags)
  17 #define flat_set_persistent(relval, p)          0
  18 #define flat_reloc_valid(reloc, size)           \
  19         (((reloc) - textlen_for_m32r_lo16_data) <= (size))
  20
  21 /* Convert a relocation entry into an address.  */
  22 static inline unsigned long
  23 flat_get_relocate_addr (unsigned long relval)
  24 {
  25         return relval & 0x00ffffff; /* Mask out top 8-bits */
  26 }
  27
  28 #define flat_m32r_get_reloc_type(relval)        ((relval) >> 24)
  29
  30 #define M32R_SETH_OPCODE        0xd0c00000 /* SETH instruction code */
  31
  32 #define FLAT_M32R_32            0x00    /* 32bits reloc */
  33 #define FLAT_M32R_24            0x01    /* unsigned 24bits reloc */
  34 #define FLAT_M32R_16            0x02    /* 16bits reloc */
  35 #define FLAT_M32R_LO16          0x03    /* signed low 16bits reloc (low()) */
  36 #define FLAT_M32R_LO16_DATA     0x04    /* signed low 16bits reloc (low())
  37                                            for a symbol in .data section */
  38                                         /* High 16bits of an address used
  39                                            when the lower 16bbits are treated
  40                                            as unsigned.
  41                                            To create SETH instruction only.
  42                                            0x1X: X means a number of register.
  43                                            0x10 - 0x3F are reserved. */
  44 #define FLAT_M32R_HI16_ULO      0x10    /* reloc for SETH Rn,#high(imm16) */
  45                                         /* High 16bits of an address used
  46                                            when the lower 16bbits are treated
  47                                            as signed.
  48                                            To create SETH instruction only.
  49                                            0x2X: X means a number of register.
  50                                            0x20 - 0x4F are reserved. */
  51 #define FLAT_M32R_HI16_SLO      0x20    /* reloc for SETH Rn,#shigh(imm16) */
  52
  53 static unsigned long textlen_for_m32r_lo16_data = 0;
  54
  55 static inline unsigned long m32r_flat_get_addr_from_rp (u32 *rp,
  56                                                         u32 relval,
  57                                                         u32 textlen)
  58 {
  59         unsigned int reloc = flat_m32r_get_reloc_type (relval);
  60         textlen_for_m32r_lo16_data = 0;
  61         if (reloc & 0xf0) {
  62                 unsigned long addr = htonl(*rp);
  63                 switch (reloc & 0xf0)
  64                 {
  65                 case FLAT_M32R_HI16_ULO:
  66                 case FLAT_M32R_HI16_SLO:
  67                         if (addr == 0) {
  68                                 /* put "seth Rn,#0x0" instead of 0 (addr). */
  69                                 *rp = (M32R_SETH_OPCODE | ((reloc & 0x0f)<<24));
  70                         }
  71                         return addr;
  72                 default:
  73                         break;
  74                 }
  75         } else {
  76                 switch (reloc)
  77                 {
  78                 case FLAT_M32R_LO16:
  79                         return htonl(*rp) & 0xFFFF;
  80                 case FLAT_M32R_LO16_DATA:
  81                         /* FIXME: The return value will decrease by textlen
  82                            at m32r_flat_put_addr_at_rp () */
  83                         textlen_for_m32r_lo16_data = textlen;
  84                         return (htonl(*rp) & 0xFFFF) + textlen;
  85                 case FLAT_M32R_16:
  86                         return htons(*(unsigned short *)rp) & 0xFFFF;
  87                 case FLAT_M32R_24:
  88                         return htonl(*rp) & 0xFFFFFF;
  89                 case FLAT_M32R_32:
  90                         return htonl(*rp);
  91                 default:
  92                         break;
  93                 }
  94         }
  95         return ~0;      /* bogus value */
  96 }
  97
  98 static inline int flat_put_addr_at_rp(u32 *rp, u32 addr, u32 relval)
  99 {
 100         unsigned int reloc = flat_m32r_get_reloc_type (relval);
 101         if (reloc & 0xf0) {
 102                 unsigned long Rn = reloc & 0x0f; /* get a number of register */
 103                 Rn <<= 24; /* 0x0R000000 */
 104                 reloc &= 0xf0;
 105                 switch (reloc)
 106                 {
 107                 case FLAT_M32R_HI16_ULO: /* To create SETH Rn,#high(imm16) */
 108                         *rp = (M32R_SETH_OPCODE | Rn
 109                                | ((addr >> 16) & 0xFFFF));
 110                         break;
 111                 case FLAT_M32R_HI16_SLO: /* To create SETH Rn,#shigh(imm16) */
 112                         *rp = (M32R_SETH_OPCODE | Rn
 113                                | (((addr >> 16) + ((addr & 0x8000) ? 1 : 0))
 114                                   & 0xFFFF));
 115                         break;
 116                 }
 117         } else {
 118                 switch (reloc) {
 119                 case FLAT_M32R_LO16_DATA:
 120                         addr -= textlen_for_m32r_lo16_data;
 121                         textlen_for_m32r_lo16_data = 0;
 122                 case FLAT_M32R_LO16:
 123                         *rp = (htonl(*rp) & 0xFFFF0000) | (addr & 0xFFFF);
 124                         break;
 125                 case FLAT_M32R_16:
 126                         *(unsigned short *)rp = addr & 0xFFFF;
 127                         break;
 128                 case FLAT_M32R_24:
 129                         *rp = (htonl(*rp) & 0xFF000000) | (addr & 0xFFFFFF);
 130                         break;
 131                 case FLAT_M32R_32:
 132                         *rp = addr;
 133                         break;
 134                 }
 135         }
 136         return 0;
 137 }
 138
 139 // kludge - text_len is a local variable in the only user.
 140 #define flat_get_addr_from_rp(rp, relval, flags, addr, persistent) \
 141         (m32r_flat_get_addr_from_rp(rp, relval, text_len), 0)
 142
 143 #endif /* __ASM_M32R_FLAT_H */