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