/* tc-fr30.c -- Assembler for the Fujitsu FR30. Copyright (C) 1998 Free Software Foundation. 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 2, 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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include #include #include "as.h" #include "subsegs.h" #include "symcat.h" #include "cgen-opc.h" #include "cgen.h" /* Structure to hold all of the different components describing an individual instruction. */ typedef struct { const CGEN_INSN * insn; const CGEN_INSN * orig_insn; CGEN_FIELDS fields; #if CGEN_INT_INSN_P CGEN_INSN_INT buffer [1]; #define INSN_VALUE(buf) (*(buf)) #else unsigned char buffer [CGEN_MAX_INSN_SIZE]; #define INSN_VALUE(buf) (buf) #endif char * addr; fragS * frag; int num_fixups; fixS * fixups [GAS_CGEN_MAX_FIXUPS]; int indices [MAX_OPERAND_INSTANCES]; } fr30_insn; const char comment_chars[] = ";"; const char line_comment_chars[] = "#"; const char line_separator_chars[] = "|"; const char EXP_CHARS[] = "eE"; const char FLT_CHARS[] = "dD"; #define FR30_SHORTOPTS "" const char * md_shortopts = FR30_SHORTOPTS; struct option md_longopts[] = { {NULL, no_argument, NULL, 0} }; size_t md_longopts_size = sizeof (md_longopts); int md_parse_option (c, arg) int c; char * arg; { switch (c) { default: return 0; } return 1; } void md_show_usage (stream) FILE * stream; { fprintf (stream, _(" FR30 specific command line options:\n")); } /* The target specific pseudo-ops which we support. */ const pseudo_typeS md_pseudo_table[] = { { "word", cons, 4 }, { NULL, NULL, 0 } }; void md_begin () { flagword applicable; segT seg; subsegT subseg; /* Initialize the `cgen' interface. */ /* Set the machine number and endian. */ gas_cgen_opcode_desc = fr30_cgen_opcode_open (bfd_mach_fr30, CGEN_ENDIAN_BIG); fr30_cgen_init_asm (gas_cgen_opcode_desc); /* This is a callback from cgen to gas to parse operands. */ cgen_set_parse_operand_fn (gas_cgen_opcode_desc, gas_cgen_parse_operand); } void md_assemble (str) char * str; { fr30_insn insn; char * errmsg; char * str2 = NULL; /* Initialize GAS's cgen interface for a new instruction. */ gas_cgen_init_parse (); insn.insn = fr30_cgen_assemble_insn (gas_cgen_opcode_desc, str, & insn.fields, insn.buffer, & errmsg); if (!insn.insn) { as_bad (errmsg); return; } /* Doesn't really matter what we pass for RELAX_P here. */ gas_cgen_finish_insn (insn.insn, insn.buffer, CGEN_FIELDS_BITSIZE (& insn.fields), 1, NULL); } /* The syntax in the manual says constants begin with '#'. We just ignore it. */ void md_operand (expressionP) expressionS * expressionP; { if (* input_line_pointer == '#') { input_line_pointer ++; expression (expressionP); } } valueT md_section_align (segment, size) segT segment; valueT size; { int align = bfd_get_section_alignment (stdoutput, segment); return ((size + (1 << align) - 1) & (-1 << align)); } symbolS * md_undefined_symbol (name) char * name; { return 0; } /* Interface to relax_segment. */ /* FIXME: Build table by hand, get it working, then machine generate. */ const relax_typeS md_relax_table[] = { /* The fields are: 1) most positive reach of this state, 2) most negative reach of this state, 3) how many bytes this mode will add to the size of the current frag 4) which index into the table to try if we can't fit into this one. */ /* The first entry must be unused because an `rlx_more' value of zero ends each list. */ {1, 1, 0, 0}, /* The displacement used by GAS is from the end of the 2 byte insn, so we subtract 2 from the following. */ /* 16 bit insn, 8 bit disp -> 10 bit range. This doesn't handle a branch in the right slot at the border: the "& -4" isn't taken into account. It's not important enough to complicate things over it, so we subtract an extra 2 (or + 2 in -ve case). */ {511 - 2 - 2, -512 - 2 + 2, 0, 2 }, /* 32 bit insn, 24 bit disp -> 26 bit range. */ {0x2000000 - 1 - 2, -0x2000000 - 2, 2, 0 }, /* Same thing, but with leading nop for alignment. */ {0x2000000 - 1 - 2, -0x2000000 - 2, 4, 0 } }; long fr30_relax_frag (fragP, stretch) fragS * fragP; long stretch; { /* Address of branch insn. */ long address = fragP->fr_address + fragP->fr_fix - 2; long growth = 0; /* Keep 32 bit insns aligned on 32 bit boundaries. */ if (fragP->fr_subtype == 2) { if ((address & 3) != 0) { fragP->fr_subtype = 3; growth = 2; } } else if (fragP->fr_subtype == 3) { if ((address & 3) == 0) { fragP->fr_subtype = 2; growth = -2; } } else { growth = relax_frag (fragP, stretch); /* Long jump on odd halfword boundary? */ if (fragP->fr_subtype == 2 && (address & 3) != 0) { fragP->fr_subtype = 3; growth += 2; } } return growth; } /* Return an initial guess of the length by which a fragment must grow to hold a branch to reach its destination. Also updates fr_type/fr_subtype as necessary. Called just before doing relaxation. Any symbol that is now undefined will not become defined. The guess for fr_var is ACTUALLY the growth beyond fr_fix. Whatever we do to grow fr_fix or fr_var contributes to our returned value. Although it may not be explicit in the frag, pretend fr_var starts with a 0 value. */ int md_estimate_size_before_relax (fragP, segment) fragS * fragP; segT segment; { int old_fr_fix = fragP->fr_fix; /* The only thing we have to handle here are symbols outside of the current segment. They may be undefined or in a different segment in which case linker scripts may place them anywhere. However, we can't finish the fragment here and emit the reloc as insn alignment requirements may move the insn about. */ if (S_GET_SEGMENT (fragP->fr_symbol) != segment) { /* The symbol is undefined in this segment. Change the relaxation subtype to the max allowable and leave all further handling to md_convert_frag. */ fragP->fr_subtype = 2; #if 0 /* Can't use this, but leave in for illustration. */ /* Change 16 bit insn to 32 bit insn. */ fragP->fr_opcode[0] |= 0x80; /* Increase known (fixed) size of fragment. */ fragP->fr_fix += 2; /* Create a relocation for it. */ fix_new (fragP, old_fr_fix, 4, fragP->fr_symbol, fragP->fr_offset, 1 /* pcrel */, /* FIXME: Can't use a real BFD reloc here. gas_cgen_md_apply_fix3 can't handle it. */ BFD_RELOC_FR30_26_PCREL); /* Mark this fragment as finished. */ frag_wane (fragP); #else { const CGEN_INSN * insn; int i; /* Update the recorded insn. Fortunately we don't have to look very far. FIXME: Change this to record in the instruction the next higher relaxable insn to use. */ for (i = 0, insn = fragP->fr_cgen.insn; i < 4; i++, insn++) { if ((strcmp (CGEN_INSN_MNEMONIC (insn), CGEN_INSN_MNEMONIC (fragP->fr_cgen.insn)) == 0) && CGEN_INSN_ATTR (insn, CGEN_INSN_RELAX)) break; } if (i == 4) abort (); fragP->fr_cgen.insn = insn; return 2; } #endif } return (fragP->fr_var + fragP->fr_fix - old_fr_fix); } /* *fragP has been relaxed to its final size, and now needs to have the bytes inside it modified to conform to the new size. Called after relaxation is finished. fragP->fr_type == rs_machine_dependent. fragP->fr_subtype is the subtype of what the address relaxed to. */ void md_convert_frag (abfd, sec, fragP) bfd * abfd; segT sec; fragS * fragP; { #if 0 char * opcode; char * displacement; int target_address; int opcode_address; int extension; int addend; opcode = fragP->fr_opcode; /* Address opcode resides at in file space. */ opcode_address = fragP->fr_address + fragP->fr_fix - 2; switch (fragP->fr_subtype) { case 1 : extension = 0; displacement = & opcode[1]; break; case 2 : opcode[0] |= 0x80; extension = 2; displacement = & opcode[1]; break; case 3 : opcode[2] = opcode[0] | 0x80; md_number_to_chars (opcode, PAR_NOP_INSN, 2); opcode_address += 2; extension = 4; displacement = & opcode[3]; break; default : abort (); } if (S_GET_SEGMENT (fragP->fr_symbol) != sec) { /* symbol must be resolved by linker */ if (fragP->fr_offset & 3) as_warn (_("Addend to unresolved symbol not on word boundary.")); addend = fragP->fr_offset >> 2; } else { /* Address we want to reach in file space. */ target_address = S_GET_VALUE (fragP->fr_symbol) + fragP->fr_offset; target_address += fragP->fr_symbol->sy_frag->fr_address; addend = (target_address - (opcode_address & -4)) >> 2; } /* Create a relocation for symbols that must be resolved by the linker. Otherwise output the completed insn. */ if (S_GET_SEGMENT (fragP->fr_symbol) != sec) { assert (fragP->fr_subtype != 1); assert (fragP->fr_cgen.insn != 0); gas_cgen_record_fixup (fragP, /* Offset of branch insn in frag. */ fragP->fr_fix + extension - 4, fragP->fr_cgen.insn, 4 /*length*/, /* FIXME: quick hack */ #if 0 CGEN_OPERAND_ENTRY (fragP->fr_cgen.opindex), #else CGEN_OPERAND_ENTRY (FR30_OPERAND_DISP24), #endif fragP->fr_cgen.opinfo, fragP->fr_symbol, fragP->fr_offset); } #define SIZE_FROM_RELAX_STATE(n) ((n) == 1 ? 1 : 3) md_number_to_chars (displacement, (valueT) addend, SIZE_FROM_RELAX_STATE (fragP->fr_subtype)); fragP->fr_fix += extension; #endif } /* Functions concerning relocs. */ /* The location from which a PC relative jump should be calculated, given a PC relative reloc. */ long md_pcrel_from_section (fixP, sec) fixS * fixP; segT sec; { if (fixP->fx_addsy != (symbolS *) NULL && (! S_IS_DEFINED (fixP->fx_addsy) || S_GET_SEGMENT (fixP->fx_addsy) != sec)) { /* The symbol is undefined (or is defined but not in this section). Let the linker figure it out. */ return 0; } return (fixP->fx_frag->fr_address + fixP->fx_where) & ~1; } /* Return the bfd reloc type for OPERAND of INSN at fixup FIXP. Returns BFD_RELOC_NONE if no reloc type can be found. *FIXP may be modified if desired. */ bfd_reloc_code_real_type md_cgen_lookup_reloc (insn, operand, fixP) const CGEN_INSN * insn; const CGEN_OPERAND * operand; fixS * fixP; { switch (CGEN_OPERAND_TYPE (operand)) { case FR30_OPERAND_LABEL9: fixP->fx_pcrel = 1; return BFD_RELOC_FR30_9_PCREL; case FR30_OPERAND_LABEL12: fixP->fx_pcrel = 1; return BFD_RELOC_FR30_12_PCREL; case FR30_OPERAND_DISP10: return BFD_RELOC_FR30_10_IN_8; case FR30_OPERAND_DISP9: return BFD_RELOC_FR30_9_IN_8; case FR30_OPERAND_DISP8: return BFD_RELOC_FR30_8_IN_8; case FR30_OPERAND_UDISP6: return BFD_RELOC_FR30_6_IN_4; case FR30_OPERAND_I8: return BFD_RELOC_8; case FR30_OPERAND_I32: return BFD_RELOC_FR30_48; case FR30_OPERAND_I20: return BFD_RELOC_FR30_20; default : /* avoid -Wall warning */ break; } return BFD_RELOC_NONE; } /* Return BFD reloc type from opinfo field in a fixS. It's tricky using fx_r_type in fr30_frob_file because the values are BFD_RELOC_UNUSED + operand number. */ #define FX_OPINFO_R_TYPE(f) ((f)->tc_fix_data.opinfo) /* See whether we need to force a relocation into the output file. This is used to force out switch and PC relative relocations when relaxing. */ int fr30_force_relocation (fix) fixS * fix; { if (fix->fx_r_type == BFD_RELOC_VTABLE_INHERIT || fix->fx_r_type == BFD_RELOC_VTABLE_ENTRY) return 1; return fix->fx_pcrel; } /* Write a value out to the object file, using the appropriate endianness. */ void md_number_to_chars (buf, val, n) char * buf; valueT val; int n; { number_to_chars_bigendian (buf, val, n); } /* Turn a string in input_line_pointer into a floating point constant of type type, and store the appropriate bytes in *litP. The number of LITTLENUMS emitted is stored in *sizeP . An error message is returned, or NULL on OK. */ /* Equal to MAX_PRECISION in atof-ieee.c */ #define MAX_LITTLENUMS 6 char * md_atof (type, litP, sizeP) char type; char * litP; int * sizeP; { int i; int prec; LITTLENUM_TYPE words [MAX_LITTLENUMS]; char * t; char * atof_ieee (); switch (type) { case 'f': case 'F': case 's': case 'S': prec = 2; break; case 'd': case 'D': case 'r': case 'R': prec = 4; break; /* FIXME: Some targets allow other format chars for bigger sizes here. */ default: * sizeP = 0; return _("Bad call to md_atof()"); } t = atof_ieee (input_line_pointer, type, words); if (t) input_line_pointer = t; * sizeP = prec * sizeof (LITTLENUM_TYPE); for (i = 0; i < prec; i++) { md_number_to_chars (litP, (valueT) words[i], sizeof (LITTLENUM_TYPE)); litP += sizeof (LITTLENUM_TYPE); } return 0; } /* Worker function for fr30_is_colon_insn(). */ static char restore_colon (advance_i_l_p_by) int advance_i_l_p_by; { char c; /* Restore the colon, and advance input_line_pointer to the end of the new symbol. */ * input_line_pointer = ':'; input_line_pointer += advance_i_l_p_by; c = * input_line_pointer; * input_line_pointer = 0; return c; } /* Determines if the symbol starting at START and ending in a colon that was at the location pointed to by INPUT_LINE_POINTER (but which has now been replaced bu a NUL) is in fact an LDI:8, LDI:20, LDI:32, CALL:D. JMP:D, RET:D or Bcc:D instruction. If it is, then it restores the colon, advances INPUT_LINE_POINTER to the real end of the instruction/symbol, and returns the character that really terminated the symbol. Otherwise it returns 0. */ char fr30_is_colon_insn (start) char * start; { char * i_l_p = input_line_pointer; /* Check to see if the symbol parsed so far is 'ldi' */ if ( (start[0] != 'l' && start[0] != 'L') || (start[1] != 'd' && start[1] != 'D') || (start[2] != 'i' && start[2] != 'I') || start[3] != 0) { /* Nope - check to see a 'd' follows the colon. */ if ( (i_l_p[1] == 'd' || i_l_p[1] == 'D') && (i_l_p[2] == ' ' || i_l_p[2] == '\t' || i_l_p[2] == '\n')) { /* Yup - it might be delay slot instruction. */ int i; static char * delay_insns [] = { "call", "jmp", "ret", "bra", "bno", "beq", "bne", "bc", "bnc", "bn", "bp", "bv", "bnv", "blt", "bge", "ble", "bgt", "bls", "bhi" }; for (i = sizeof (delay_insns) / sizeof (delay_insns[0]); i--;) { char * insn = delay_insns[i]; int len = strlen (insn); if (start [len] != 0) continue; while (len --) if (tolower (start [len]) != insn [len]) break; if (len == -1) return restore_colon (1); } } /* Nope - it is a normal label. */ return 0; } /* Check to see if the text following the colon is '8' */ if (i_l_p[1] == '8' && (i_l_p[2] == ' ' || i_l_p[2] == '\t')) return restore_colon (2); /* Check to see if the text following the colon is '20' */ else if (i_l_p[1] == '2' && i_l_p[2] =='0' && (i_l_p[3] == ' ' || i_l_p[3] == '\t')) return restore_colon (3); /* Check to see if the text following the colon is '32' */ else if (i_l_p[1] == '3' && i_l_p[2] =='2' && (i_l_p[3] == ' ' || i_l_p[3] == '\t')) return restore_colon (3); return 0; }