| /* Assembly backend for the OpenRISC 1000. |
| Copyright (C) 2002, 2003, 2005, 2007, 2009, 2010, 2012 |
| Free Software Foundation, Inc. |
| Contributed by Damjan Lampret <lampret@opencores.org>. |
| Modified bu Johan Rydberg, <johan.rydberg@netinsight.se>. |
| Based upon a29k port. |
| |
| This file is part of GAS, the GNU Assembler. |
| |
| GAS is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 3, or (at your option) |
| any later version. |
| |
| GAS is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GAS; see the file COPYING. If not, write to |
| the Free Software Foundation, 51 Franklin Street - Fifth Floor, |
| Boston, MA 02110-1301, USA. */ |
| |
| /* tc-a29k.c used as a template. */ |
| |
| #include "as.h" |
| #include "safe-ctype.h" |
| #include "opcode/or32.h" |
| #include "elf/or32.h" |
| |
| #define DEBUG 0 |
| |
| #ifndef REGISTER_PREFIX |
| #define REGISTER_PREFIX '%' |
| #endif |
| |
| /* Make it easier to clone this machine desc into another one. */ |
| #define machine_opcode or32_opcode |
| #define machine_opcodes or32_opcodes |
| #define machine_ip or32_ip |
| #define machine_it or32_it |
| |
| /* Handle of the OPCODE hash table. */ |
| static struct hash_control *op_hash = NULL; |
| |
| struct machine_it |
| { |
| char * error; |
| unsigned long opcode; |
| struct nlist * nlistp; |
| expressionS exp; |
| int pcrel; |
| int reloc_offset; /* Offset of reloc within insn. */ |
| int reloc; |
| } |
| the_insn; |
| |
| const pseudo_typeS md_pseudo_table[] = |
| { |
| {"align", s_align_bytes, 4 }, |
| {"space", s_space, 0 }, |
| {"cputype", s_ignore, 0 }, |
| {"reg", s_lsym, 0 }, /* Register equate, same as equ. */ |
| {"sect", s_ignore, 0 }, /* Creation of coff sections. */ |
| {"proc", s_ignore, 0 }, /* Start of a function. */ |
| {"endproc", s_ignore, 0 }, /* Function end. */ |
| {"word", cons, 4 }, |
| {NULL, 0, 0 }, |
| }; |
| |
| int md_short_jump_size = 4; |
| int md_long_jump_size = 4; |
| |
| /* This array holds the chars that always start a comment. |
| If the pre-processor is disabled, these aren't very useful. */ |
| const char comment_chars[] = "#"; |
| |
| /* This array holds the chars that only start a comment at the beginning of |
| a line. If the line seems to have the form '# 123 filename' |
| .line and .file directives will appear in the pre-processed output. */ |
| /* Note that input_file.c hand checks for '#' at the beginning of the |
| first line of the input file. This is because the compiler outputs |
| #NO_APP at the beginning of its output. */ |
| /* Also note that comments like this one will always work. */ |
| const char line_comment_chars[] = "#"; |
| |
| /* We needed an unused char for line separation to work around the |
| lack of macros, using sed and such. */ |
| const char line_separator_chars[] = ";"; |
| |
| /* Chars that can be used to separate mant from exp in floating point nums. */ |
| const char EXP_CHARS[] = "eE"; |
| |
| /* Chars that mean this number is a floating point constant. |
| As in 0f12.456 |
| or 0d1.2345e12. */ |
| const char FLT_CHARS[] = "rRsSfFdDxXpP"; |
| |
| /* "l.jalr r9" precalculated opcode. */ |
| static unsigned long jalr_r9_opcode; |
| |
| static void machine_ip (char *); |
| |
| |
| /* Set bits in machine opcode according to insn->encoding |
| description and passed operand. */ |
| |
| static void |
| encode (const struct machine_opcode *insn, |
| unsigned long *opcode, |
| signed long param_val, |
| char param_ch) |
| { |
| int opc_pos = 0; |
| int param_pos = 0; |
| char *enc; |
| |
| #if DEBUG |
| printf (" encode: opcode=%.8lx param_val=%.8lx abs=%.8lx param_ch=%c\n", |
| *opcode, param_val, abs (param_val), param_ch); |
| #endif |
| for (enc = insn->encoding; *enc != '\0'; enc++) |
| if (*enc == param_ch) |
| { |
| if (enc - 2 >= insn->encoding && (*(enc - 2) == '0') && (*(enc - 1) == 'x')) |
| continue; |
| else |
| param_pos ++; |
| } |
| |
| opc_pos = 32; |
| |
| for (enc = insn->encoding; *enc != '\0';) |
| { |
| if ((*enc == '0') && (*(enc + 1) == 'x')) |
| { |
| int tmp = strtol (enc, NULL, 16); |
| |
| opc_pos -= 4; |
| *opcode |= tmp << opc_pos; |
| enc += 3; |
| } |
| else if ((*enc == '0') || (*enc == '-')) |
| { |
| opc_pos--; |
| enc++; |
| } |
| else if (*enc == '1') |
| { |
| opc_pos--; |
| *opcode |= 1 << opc_pos; |
| enc++; |
| } |
| else if (*enc == param_ch) |
| { |
| opc_pos--; |
| param_pos--; |
| *opcode |= ((param_val >> param_pos) & 0x1) << opc_pos; |
| enc++; |
| } |
| else if (ISALPHA (*enc)) |
| { |
| opc_pos--; |
| enc++; |
| } |
| else |
| enc++; |
| } |
| |
| #if DEBUG |
| printf (" opcode=%.8lx\n", *opcode); |
| #endif |
| } |
| |
| /* This function is called once, at assembler startup time. It should |
| set up all the tables, etc., that the MD part of the assembler will |
| need. */ |
| |
| void |
| md_begin (void) |
| { |
| const char *retval = NULL; |
| int lose = 0; |
| int skipnext = 0; |
| unsigned int i; |
| |
| /* Hash up all the opcodes for fast use later. */ |
| op_hash = hash_new (); |
| |
| for (i = 0; i < or32_num_opcodes; i++) |
| { |
| const char *name = machine_opcodes[i].name; |
| |
| if (skipnext) |
| { |
| skipnext = 0; |
| continue; |
| } |
| |
| retval = hash_insert (op_hash, name, (void *) &machine_opcodes[i]); |
| if (retval != NULL) |
| { |
| fprintf (stderr, "internal error: can't hash `%s': %s\n", |
| machine_opcodes[i].name, retval); |
| lose = 1; |
| } |
| } |
| |
| if (lose) |
| as_fatal (_("Broken assembler. No assembly attempted.")); |
| |
| encode (&machine_opcodes[insn_index ("l.jalr")], &jalr_r9_opcode, 9, 'B'); |
| } |
| |
| /* Returns non zero if instruction is to be used. */ |
| |
| static int |
| check_invalid_opcode (unsigned long opcode) |
| { |
| return opcode == jalr_r9_opcode; |
| } |
| |
| /* Assemble a single instruction. Its label has already been handled |
| by the generic front end. We just parse opcode and operands, and |
| produce the bytes of data and relocation. */ |
| |
| void |
| md_assemble (char *str) |
| { |
| char *toP; |
| |
| #if DEBUG |
| printf ("NEW INSTRUCTION\n"); |
| #endif |
| |
| know (str); |
| machine_ip (str); |
| toP = frag_more (4); |
| |
| /* Put out the opcode. */ |
| md_number_to_chars (toP, the_insn.opcode, 4); |
| |
| /* Put out the symbol-dependent stuff. */ |
| if (the_insn.reloc != BFD_RELOC_NONE) |
| { |
| fix_new_exp (frag_now, |
| (toP - frag_now->fr_literal + the_insn.reloc_offset), |
| 4, /* size */ |
| &the_insn.exp, |
| the_insn.pcrel, |
| the_insn.reloc); |
| } |
| } |
| |
| /* This is true of the we have issued a "lo(" or "hi"(. */ |
| static int waiting_for_shift = 0; |
| |
| static int mask_or_shift = 0; |
| |
| static char * |
| parse_operand (char *s, expressionS *operandp, int opt) |
| { |
| char *save = input_line_pointer; |
| char *new_pointer; |
| |
| #if DEBUG |
| printf (" PROCESS NEW OPERAND(%s) == %c (%d)\n", s, opt ? opt : '!', opt); |
| #endif |
| |
| input_line_pointer = s; |
| |
| if (strncasecmp (s, "HI(", 3) == 0) |
| { |
| waiting_for_shift = 1; |
| mask_or_shift = BFD_RELOC_HI16; |
| |
| input_line_pointer += 3; |
| } |
| else if (strncasecmp (s, "LO(", 3) == 0) |
| { |
| mask_or_shift = BFD_RELOC_LO16; |
| |
| input_line_pointer += 3; |
| } |
| else |
| mask_or_shift = 0; |
| |
| if ((*s == '(') && (*(s+1) == 'r')) |
| s++; |
| |
| if ((*s == 'r') && ISDIGIT (*(s + 1))) |
| { |
| operandp->X_add_number = strtol (s + 1, NULL, 10); |
| operandp->X_op = O_register; |
| for (; (*s != ',') && (*s != '\0');) |
| s++; |
| input_line_pointer = save; |
| return s; |
| } |
| |
| expression (operandp); |
| |
| if (operandp->X_op == O_absent) |
| { |
| if (! opt) |
| as_bad (_("missing operand")); |
| else |
| { |
| operandp->X_add_number = 0; |
| operandp->X_op = O_constant; |
| } |
| } |
| |
| new_pointer = input_line_pointer; |
| input_line_pointer = save; |
| |
| #if DEBUG |
| printf (" %s=parse_operand(%s): operandp->X_op = %u\n", new_pointer, s, |
| operandp->X_op); |
| #endif |
| |
| return new_pointer; |
| } |
| |
| /* Instruction parsing. Takes a string containing the opcode. |
| Operands are at input_line_pointer. Output is in the_insn. |
| Warnings or errors are generated. */ |
| |
| static void |
| machine_ip (char *str) |
| { |
| char *s; |
| const char *args; |
| const struct machine_opcode *insn; |
| unsigned long opcode; |
| expressionS the_operand; |
| expressionS *operand = &the_operand; |
| unsigned int regno; |
| int reloc = BFD_RELOC_NONE; |
| |
| #if DEBUG |
| printf ("machine_ip(%s)\n", str); |
| #endif |
| |
| s = str; |
| for (; ISALNUM (*s) || *s == '.'; ++s) |
| if (ISUPPER (*s)) |
| *s = TOLOWER (*s); |
| |
| switch (*s) |
| { |
| case '\0': |
| break; |
| |
| case ' ': /* FIXME-SOMEDAY more whitespace. */ |
| *s++ = '\0'; |
| break; |
| |
| default: |
| as_bad (_("unknown opcode1: `%s'"), str); |
| return; |
| } |
| |
| if ((insn = (struct machine_opcode *) hash_find (op_hash, str)) == NULL) |
| { |
| as_bad (_("unknown opcode2 `%s'."), str); |
| return; |
| } |
| |
| opcode = 0; |
| memset (&the_insn, '\0', sizeof (the_insn)); |
| the_insn.reloc = BFD_RELOC_NONE; |
| |
| reloc = BFD_RELOC_NONE; |
| |
| /* Build the opcode, checking as we go to make sure that the |
| operands match. |
| |
| If an operand matches, we modify the_insn or opcode appropriately, |
| and do a "continue". If an operand fails to match, we "break". */ |
| if (insn->args[0] != '\0') |
| /* Prime the pump. */ |
| s = parse_operand (s, operand, insn->args[0] == 'I'); |
| |
| for (args = insn->args;; ++args) |
| { |
| #if DEBUG |
| printf (" args = %s\n", args); |
| #endif |
| switch (*args) |
| { |
| case '\0': /* End of args. */ |
| /* We have have 0 args, do the bazoooka! */ |
| if (args == insn->args) |
| encode (insn, &opcode, 0, 0); |
| |
| if (*s == '\0') |
| { |
| /* We are truly done. */ |
| the_insn.opcode = opcode; |
| if (check_invalid_opcode (opcode)) |
| as_bad (_("instruction not allowed: %s"), str); |
| return; |
| } |
| as_bad (_("too many operands: %s"), s); |
| break; |
| |
| case ',': /* Must match a comma. */ |
| if (*s++ == ',') |
| { |
| reloc = BFD_RELOC_NONE; |
| |
| /* Parse next operand. */ |
| s = parse_operand (s, operand, args[1] == 'I'); |
| #if DEBUG |
| printf (" ',' case: operand->X_add_number = %d, *args = %s, *s = %s\n", |
| operand->X_add_number, args, s); |
| #endif |
| continue; |
| } |
| break; |
| |
| case '(': /* Must match a (. */ |
| s = parse_operand (s, operand, args[1] == 'I'); |
| continue; |
| |
| case ')': /* Must match a ). */ |
| continue; |
| |
| case 'r': /* A general register. */ |
| args++; |
| |
| if (operand->X_op != O_register) |
| break; /* Only registers. */ |
| |
| know (operand->X_add_symbol == 0); |
| know (operand->X_op_symbol == 0); |
| regno = operand->X_add_number; |
| encode (insn, &opcode, regno, *args); |
| #if DEBUG |
| printf (" r: operand->X_op = %d\n", operand->X_op); |
| #endif |
| continue; |
| |
| default: |
| /* if (! ISALPHA (*args)) |
| break; */ /* Only immediate values. */ |
| |
| if (mask_or_shift) |
| { |
| #if DEBUG |
| printf ("mask_or_shift = %d\n", mask_or_shift); |
| #endif |
| reloc = mask_or_shift; |
| } |
| mask_or_shift = 0; |
| |
| if (strncasecmp (args, "LO(", 3) == 0) |
| { |
| #if DEBUG |
| printf ("reloc_const\n"); |
| #endif |
| reloc = BFD_RELOC_LO16; |
| } |
| else if (strncasecmp (args, "HI(", 3) == 0) |
| { |
| #if DEBUG |
| printf ("reloc_consth\n"); |
| #endif |
| reloc = BFD_RELOC_HI16; |
| } |
| |
| if (*s == '(') |
| operand->X_op = O_constant; |
| else if (*s == ')') |
| s += 1; |
| #if DEBUG |
| printf (" default case: operand->X_add_number = %d, *args = %s, *s = %s\n", operand->X_add_number, args, s); |
| #endif |
| if (operand->X_op == O_constant) |
| { |
| if (reloc == BFD_RELOC_NONE) |
| { |
| bfd_vma v, mask; |
| |
| mask = 0x3ffffff; |
| v = abs (operand->X_add_number) & ~ mask; |
| if (v) |
| as_bad (_("call/jmp target out of range (1)")); |
| } |
| |
| if (reloc == BFD_RELOC_HI16) |
| operand->X_add_number = ((operand->X_add_number >> 16) & 0xffff); |
| |
| the_insn.pcrel = 0; |
| encode (insn, &opcode, operand->X_add_number, *args); |
| /* the_insn.reloc = BFD_RELOC_NONE; */ |
| continue; |
| } |
| |
| if (reloc == BFD_RELOC_NONE) |
| the_insn.reloc = BFD_RELOC_32_GOT_PCREL; |
| else |
| the_insn.reloc = reloc; |
| |
| /* the_insn.reloc = insn->reloc; */ |
| #if DEBUG |
| printf (" reloc sym=%d\n", the_insn.reloc); |
| printf (" BFD_RELOC_NONE=%d\n", BFD_RELOC_NONE); |
| #endif |
| the_insn.exp = *operand; |
| |
| /* the_insn.reloc_offset = 1; */ |
| the_insn.pcrel = 1; /* Assume PC-relative jump. */ |
| |
| /* FIXME-SOON, Do we figure out whether abs later, after |
| know sym val? */ |
| if (reloc == BFD_RELOC_LO16 || reloc == BFD_RELOC_HI16) |
| the_insn.pcrel = 0; |
| |
| encode (insn, &opcode, operand->X_add_number, *args); |
| continue; |
| } |
| |
| /* Types or values of args don't match. */ |
| as_bad (_("invalid operands")); |
| return; |
| } |
| } |
| |
| char * |
| md_atof (int type, char * litP, int * sizeP) |
| { |
| return ieee_md_atof (type, litP, sizeP, TRUE); |
| } |
| |
| /* Write out big-endian. */ |
| |
| void |
| md_number_to_chars (char *buf, valueT val, int n) |
| { |
| number_to_chars_bigendian (buf, val, n); |
| } |
| |
| void |
| md_apply_fix (fixS * fixP, valueT * val, segT seg ATTRIBUTE_UNUSED) |
| { |
| char *buf = fixP->fx_where + fixP->fx_frag->fr_literal; |
| long t_val; |
| |
| t_val = (long) *val; |
| |
| #if DEBUG |
| printf ("md_apply_fix val:%x\n", t_val); |
| #endif |
| |
| fixP->fx_addnumber = t_val; /* Remember value for emit_reloc. */ |
| |
| switch (fixP->fx_r_type) |
| { |
| case BFD_RELOC_32: /* XXXXXXXX pattern in a word. */ |
| #if DEBUG |
| printf ("reloc_const: val=%x\n", t_val); |
| #endif |
| buf[0] = t_val >> 24; |
| buf[1] = t_val >> 16; |
| buf[2] = t_val >> 8; |
| buf[3] = t_val; |
| break; |
| |
| case BFD_RELOC_16: /* XXXX0000 pattern in a word. */ |
| #if DEBUG |
| printf ("reloc_const: val=%x\n", t_val); |
| #endif |
| buf[0] = t_val >> 8; |
| buf[1] = t_val; |
| break; |
| |
| case BFD_RELOC_8: /* XX000000 pattern in a word. */ |
| #if DEBUG |
| printf ("reloc_const: val=%x\n", t_val); |
| #endif |
| buf[0] = t_val; |
| break; |
| |
| case BFD_RELOC_LO16: /* 0000XXXX pattern in a word. */ |
| #if DEBUG |
| printf ("reloc_const: val=%x\n", t_val); |
| #endif |
| buf[2] = t_val >> 8; /* Holds bits 0000XXXX. */ |
| buf[3] = t_val; |
| break; |
| |
| case BFD_RELOC_HI16: /* 0000XXXX pattern in a word. */ |
| #if DEBUG |
| printf ("reloc_consth: val=%x\n", t_val); |
| #endif |
| buf[2] = t_val >> 24; /* Holds bits XXXX0000. */ |
| buf[3] = t_val >> 16; |
| break; |
| |
| case BFD_RELOC_32_GOT_PCREL: /* 0000XXXX pattern in a word. */ |
| if (!fixP->fx_done) |
| ; |
| else if (fixP->fx_pcrel) |
| { |
| long v = t_val >> 28; |
| |
| if (v != 0 && v != -1) |
| as_bad_where (fixP->fx_file, fixP->fx_line, |
| _("call/jmp target out of range (2)")); |
| } |
| else |
| /* This case was supposed to be handled in machine_ip. */ |
| abort (); |
| |
| buf[0] |= (t_val >> 26) & 0x03; /* Holds bits 0FFFFFFC of address. */ |
| buf[1] = t_val >> 18; |
| buf[2] = t_val >> 10; |
| buf[3] = t_val >> 2; |
| break; |
| |
| case BFD_RELOC_VTABLE_INHERIT: |
| case BFD_RELOC_VTABLE_ENTRY: |
| fixP->fx_done = 0; |
| break; |
| |
| case BFD_RELOC_NONE: |
| default: |
| as_bad (_("bad relocation type: 0x%02x"), fixP->fx_r_type); |
| break; |
| } |
| |
| if (fixP->fx_addsy == (symbolS *) NULL) |
| fixP->fx_done = 1; |
| } |
| |
| /* Should never be called for or32. */ |
| |
| void |
| md_create_short_jump (char * ptr ATTRIBUTE_UNUSED, |
| addressT from_addr ATTRIBUTE_UNUSED, |
| addressT to_addr ATTRIBUTE_UNUSED, |
| fragS * frag ATTRIBUTE_UNUSED, |
| symbolS * to_symbol ATTRIBUTE_UNUSED) |
| { |
| as_fatal ("or32_create_short_jmp\n"); |
| } |
| |
| /* Should never be called for or32. */ |
| |
| void |
| md_convert_frag (bfd * headers ATTRIBUTE_UNUSED, |
| segT seg ATTRIBUTE_UNUSED, |
| fragS * fragP ATTRIBUTE_UNUSED) |
| { |
| as_fatal ("or32_convert_frag\n"); |
| } |
| |
| /* Should never be called for or32. */ |
| |
| void |
| md_create_long_jump (char * ptr ATTRIBUTE_UNUSED, |
| addressT from_addr ATTRIBUTE_UNUSED, |
| addressT to_addr ATTRIBUTE_UNUSED, |
| fragS * frag ATTRIBUTE_UNUSED, |
| symbolS * to_symbol ATTRIBUTE_UNUSED) |
| { |
| as_fatal ("or32_create_long_jump\n"); |
| } |
| |
| /* Should never be called for or32. */ |
| |
| int |
| md_estimate_size_before_relax (fragS * fragP ATTRIBUTE_UNUSED, |
| segT segtype ATTRIBUTE_UNUSED) |
| { |
| as_fatal ("or32_estimate_size_before_relax\n"); |
| return 0; |
| } |
| |
| /* Translate internal representation of relocation info to target format. |
| |
| On sparc/29k: first 4 bytes are normal unsigned long address, next three |
| bytes are index, most sig. byte first. Byte 7 is broken up with |
| bit 7 as external, bits 6 & 5 unused, and the lower |
| five bits as relocation type. Next 4 bytes are long addend. */ |
| /* Thanx and a tip of the hat to Michael Bloom, mb@ttidca.tti.com. */ |
| |
| #ifdef OBJ_AOUT |
| void |
| tc_aout_fix_to_chars (char *where, |
| fixS *fixP, |
| relax_addressT segment_address_in_file) |
| { |
| long r_symbolnum; |
| |
| #if DEBUG |
| printf ("tc_aout_fix_to_chars\n"); |
| #endif |
| |
| know (fixP->fx_r_type < BFD_RELOC_NONE); |
| know (fixP->fx_addsy != NULL); |
| |
| md_number_to_chars |
| (where, |
| fixP->fx_frag->fr_address + fixP->fx_where - segment_address_in_file, |
| 4); |
| |
| r_symbolnum = (S_IS_DEFINED (fixP->fx_addsy) |
| ? S_GET_TYPE (fixP->fx_addsy) |
| : fixP->fx_addsy->sy_number); |
| |
| where[4] = (r_symbolnum >> 16) & 0x0ff; |
| where[5] = (r_symbolnum >> 8) & 0x0ff; |
| where[6] = r_symbolnum & 0x0ff; |
| where[7] = (((!S_IS_DEFINED (fixP->fx_addsy)) << 7) & 0x80) | (0 & 0x60) | (fixP->fx_r_type & 0x1F); |
| |
| /* Also easy. */ |
| md_number_to_chars (&where[8], fixP->fx_addnumber, 4); |
| } |
| |
| #endif /* OBJ_AOUT */ |
| |
| const char *md_shortopts = ""; |
| |
| struct option md_longopts[] = |
| { |
| { NULL, no_argument, NULL, 0 } |
| }; |
| size_t md_longopts_size = sizeof (md_longopts); |
| |
| int |
| md_parse_option (int c ATTRIBUTE_UNUSED, char * arg ATTRIBUTE_UNUSED) |
| { |
| return 0; |
| } |
| |
| void |
| md_show_usage (FILE * stream ATTRIBUTE_UNUSED) |
| { |
| } |
| |
| /* This is called when a line is unrecognized. This is used to handle |
| definitions of or32 style local labels. */ |
| |
| int |
| or32_unrecognized_line (int c) |
| { |
| int lab; |
| char *s; |
| |
| if (c != '$' |
| || ! ISDIGIT ((unsigned char) input_line_pointer[0])) |
| return 0; |
| |
| s = input_line_pointer; |
| |
| lab = 0; |
| while (ISDIGIT ((unsigned char) *s)) |
| { |
| lab = lab * 10 + *s - '0'; |
| ++s; |
| } |
| |
| if (*s != ':') |
| /* Not a label definition. */ |
| return 0; |
| |
| if (dollar_label_defined (lab)) |
| { |
| as_bad (_("label \"$%d\" redefined"), lab); |
| return 0; |
| } |
| |
| define_dollar_label (lab); |
| colon (dollar_label_name (lab, 0)); |
| input_line_pointer = s + 1; |
| |
| return 1; |
| } |
| |
| /* Default the values of symbols known that should be "predefined". We |
| don't bother to predefine them unless you actually use one, since there |
| are a lot of them. */ |
| |
| symbolS * |
| md_undefined_symbol (char *name ATTRIBUTE_UNUSED) |
| { |
| return NULL; |
| } |
| |
| /* Parse an operand that is machine-specific. */ |
| |
| void |
| md_operand (expressionS *expressionP) |
| { |
| #if DEBUG |
| printf (" md_operand(input_line_pointer = %s)\n", input_line_pointer); |
| #endif |
| |
| if (input_line_pointer[0] == REGISTER_PREFIX && input_line_pointer[1] == 'r') |
| { |
| /* We have a numeric register expression. No biggy. */ |
| input_line_pointer += 2; /* Skip %r */ |
| (void) expression (expressionP); |
| |
| if (expressionP->X_op != O_constant |
| || expressionP->X_add_number > 255) |
| as_bad (_("Invalid expression after %%%%\n")); |
| expressionP->X_op = O_register; |
| } |
| else if (input_line_pointer[0] == '&') |
| { |
| /* We are taking the 'address' of a register...this one is not |
| in the manual, but it *is* in traps/fpsymbol.h! What they |
| seem to want is the register number, as an absolute number. */ |
| input_line_pointer++; /* Skip & */ |
| (void) expression (expressionP); |
| |
| if (expressionP->X_op != O_register) |
| as_bad (_("invalid register in & expression")); |
| else |
| expressionP->X_op = O_constant; |
| } |
| else if (input_line_pointer[0] == '$' |
| && ISDIGIT ((unsigned char) input_line_pointer[1])) |
| { |
| long lab; |
| char *name; |
| symbolS *sym; |
| |
| /* This is a local label. */ |
| ++input_line_pointer; |
| lab = (long) get_absolute_expression (); |
| |
| if (dollar_label_defined (lab)) |
| { |
| name = dollar_label_name (lab, 0); |
| sym = symbol_find (name); |
| } |
| else |
| { |
| name = dollar_label_name (lab, 1); |
| sym = symbol_find_or_make (name); |
| } |
| |
| expressionP->X_op = O_symbol; |
| expressionP->X_add_symbol = sym; |
| expressionP->X_add_number = 0; |
| } |
| else if (input_line_pointer[0] == '$') |
| { |
| char *s; |
| char type; |
| int fieldnum, fieldlimit; |
| LITTLENUM_TYPE floatbuf[8]; |
| |
| /* $float(), $doubleN(), or $extendN() convert floating values |
| to integers. */ |
| s = input_line_pointer; |
| |
| ++s; |
| |
| fieldnum = 0; |
| if (strncmp (s, "double", sizeof "double" - 1) == 0) |
| { |
| s += sizeof "double" - 1; |
| type = 'd'; |
| fieldlimit = 2; |
| } |
| else if (strncmp (s, "float", sizeof "float" - 1) == 0) |
| { |
| s += sizeof "float" - 1; |
| type = 'f'; |
| fieldlimit = 1; |
| } |
| else if (strncmp (s, "extend", sizeof "extend" - 1) == 0) |
| { |
| s += sizeof "extend" - 1; |
| type = 'x'; |
| fieldlimit = 4; |
| } |
| else |
| return; |
| |
| if (ISDIGIT (*s)) |
| { |
| fieldnum = *s - '0'; |
| ++s; |
| } |
| if (fieldnum >= fieldlimit) |
| return; |
| |
| SKIP_WHITESPACE (); |
| if (*s != '(') |
| return; |
| ++s; |
| SKIP_WHITESPACE (); |
| |
| s = atof_ieee (s, type, floatbuf); |
| if (s == NULL) |
| return; |
| s = s; |
| |
| SKIP_WHITESPACE (); |
| if (*s != ')') |
| return; |
| ++s; |
| SKIP_WHITESPACE (); |
| |
| input_line_pointer = s; |
| expressionP->X_op = O_constant; |
| expressionP->X_unsigned = 1; |
| expressionP->X_add_number = ((floatbuf[fieldnum * 2] |
| << LITTLENUM_NUMBER_OF_BITS) |
| + floatbuf[fieldnum * 2 + 1]); |
| } |
| } |
| |
| /* Round up a section size to the appropriate boundary. */ |
| |
| valueT |
| md_section_align (segT segment ATTRIBUTE_UNUSED, valueT size ATTRIBUTE_UNUSED) |
| { |
| return size; /* Byte alignment is fine. */ |
| } |
| |
| /* Exactly what point is a PC-relative offset relative TO? |
| On the 29000, they're relative to the address of the instruction, |
| which we have set up as the address of the fixup too. */ |
| |
| long |
| md_pcrel_from (fixS *fixP) |
| { |
| return fixP->fx_where + fixP->fx_frag->fr_address; |
| } |
| |
| /* Generate a reloc for a fixup. */ |
| |
| arelent * |
| tc_gen_reloc (asection *seg ATTRIBUTE_UNUSED, fixS *fixp) |
| { |
| arelent *reloc; |
| |
| reloc = xmalloc (sizeof (arelent)); |
| reloc->sym_ptr_ptr = xmalloc (sizeof (asymbol *)); |
| *reloc->sym_ptr_ptr = symbol_get_bfdsym (fixp->fx_addsy); |
| reloc->address = fixp->fx_frag->fr_address + fixp->fx_where; |
| /* reloc->address = fixp->fx_frag->fr_address + fixp->fx_where + fixp->fx_addnumber;*/ |
| reloc->howto = bfd_reloc_type_lookup (stdoutput, fixp->fx_r_type); |
| |
| if (reloc->howto == (reloc_howto_type *) NULL) |
| { |
| as_bad_where (fixp->fx_file, fixp->fx_line, |
| _("reloc %d not supported by object file format"), |
| (int) fixp->fx_r_type); |
| return NULL; |
| } |
| |
| if (fixp->fx_r_type == BFD_RELOC_VTABLE_ENTRY) |
| reloc->address = fixp->fx_offset; |
| |
| reloc->addend = fixp->fx_addnumber; |
| return reloc; |
| } |
