| /* tc-tic80.c -- Assemble for the TI TMS320C80 (MV) |
| Copyright (C) 1996, 1997, 1998, 1999, 2000 Free Software Foundation, Inc. |
| |
| 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 "as.h" |
| #include "opcode/tic80.h" |
| |
| #define internal_error(what) \ |
| as_fatal(_("internal error:%s:%d: %s\n"), __FILE__, __LINE__, what) |
| |
| #define internal_error_a(what,arg) \ |
| as_fatal(_("internal error:%s:%d: %s %d\n"), __FILE__, __LINE__, what, arg) |
| |
| /* Generic assembler global variables which must be defined by all |
| targets. */ |
| |
| /* Characters which always start a comment. */ |
| const char comment_chars[] = ";"; |
| |
| /* Characters which start a comment at the beginning of a line. */ |
| const char line_comment_chars[] = ";*#"; |
| |
| /* Characters which may be used to separate multiple commands on a single |
| line. The semicolon is such a character by default and should not be |
| explicitly listed. */ |
| const char line_separator_chars[] = ""; |
| |
| /* Characters which are used to indicate an exponent in a floating |
| point number. */ |
| const char EXP_CHARS[] = "eE"; |
| |
| /* Characters which mean that a number is a floating point constant, |
| as in 0f1.0. */ |
| const char FLT_CHARS[] = "fF"; |
| |
| /* This table describes all the machine specific pseudo-ops the assembler |
| has to support. The fields are: |
| |
| pseudo-op name without dot |
| function to call to execute this pseudo-op |
| integer arg to pass to the function */ |
| |
| extern void obj_coff_section (); |
| |
| const pseudo_typeS md_pseudo_table[] = { |
| { "align", s_align_bytes, 4 }, /* Do byte alignment, default is a 4 byte boundary */ |
| { "word", cons, 4 }, /* FIXME: Should this be machine independent? */ |
| { "bss", s_lcomm_bytes, 1 }, |
| { "sect", obj_coff_section, 0}, /* For compatibility with TI tools */ |
| { "section", obj_coff_section, 0}, /* Standard COFF .section pseudo-op */ |
| { NULL, NULL, 0 } |
| }; |
| |
| /* Opcode hash table. */ |
| static struct hash_control *tic80_hash; |
| |
| static struct tic80_opcode * find_opcode PARAMS ((struct tic80_opcode *, expressionS [])); |
| static void build_insn PARAMS ((struct tic80_opcode *, expressionS *)); |
| static int get_operands PARAMS ((expressionS exp[])); |
| static int const_overflow PARAMS ((unsigned long num, int bits, int flags)); |
| |
| /* Replace short PC relative instructions with long form when |
| necessary. Currently this is off by default or when given the |
| -no-relax option. Turning it on by using the -relax option forces |
| all PC relative instructions to use the long form, which is why it |
| is currently not the default. */ |
| static int tic80_relax = 0; |
| |
| int |
| md_estimate_size_before_relax (fragP, segment_type) |
| fragS *fragP; |
| segT segment_type; |
| { |
| internal_error (_("Relaxation is a luxury we can't afford")); |
| return (-1); |
| } |
| |
| /* We have no need to default values of symbols. */ |
| |
| symbolS * |
| md_undefined_symbol (name) |
| char *name; |
| { |
| return 0; |
| } |
| |
| /* 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. */ |
| |
| #define MAX_LITTLENUMS 4 |
| |
| char * |
| md_atof (type, litP, sizeP) |
| int type; |
| char *litP; |
| int *sizeP; |
| { |
| int prec; |
| LITTLENUM_TYPE words[MAX_LITTLENUMS]; |
| LITTLENUM_TYPE *wordP; |
| 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; |
| |
| 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 (wordP = words; prec--;) |
| { |
| md_number_to_chars (litP, (valueT) (*wordP++), sizeof (LITTLENUM_TYPE)); |
| litP += sizeof (LITTLENUM_TYPE); |
| } |
| return (NULL); |
| } |
| |
| /* Check to see if the constant value in NUM will fit in a field of |
| width BITS if it has flags FLAGS. */ |
| |
| static int |
| const_overflow (num, bits, flags) |
| unsigned long num; |
| int bits; |
| int flags; |
| { |
| long min, max; |
| int retval = 0; |
| |
| /* Only need to check fields less than 32 bits wide. */ |
| if (bits < 32) |
| if (flags & TIC80_OPERAND_SIGNED) |
| { |
| max = (1 << (bits - 1)) - 1; |
| min = - (1 << (bits - 1)); |
| retval = ((long) num > max) || ((long) num < min); |
| } |
| else |
| { |
| max = (1 << bits) - 1; |
| min = 0; |
| retval = (num > max) || (num < min); |
| } |
| return (retval); |
| } |
| |
| /* get_operands () parses a string of operands and fills in a passed |
| array of expressions in EXP. |
| |
| Note that we use O_absent expressions to record additional information |
| about the previous non-O_absent expression, such as ":m" or ":s" |
| modifiers or register numbers enclosed in parens like "(r10)". |
| |
| Returns the number of expressions that were placed in EXP. */ |
| |
| static int |
| get_operands (exp) |
| expressionS exp[]; |
| { |
| char *p = input_line_pointer; |
| int numexp = 0; |
| int mflag = 0; |
| int sflag = 0; |
| int parens = 0; |
| |
| while (*p) |
| { |
| /* Skip leading whitespace. */ |
| while (*p == ' ' || *p == '\t' || *p == ',') |
| p++; |
| |
| /* Check to see if we have any operands left to parse. */ |
| if (*p == 0 || *p == '\n' || *p == '\r') |
| break; |
| |
| /* Notice scaling or direct memory operand modifiers and save them in |
| an O_absent expression after the expression that they modify. */ |
| |
| if (*p == ':') |
| { |
| p++; |
| exp[numexp].X_op = O_absent; |
| if (*p == 'm') |
| { |
| p++; |
| /* This is a ":m" modifier. */ |
| exp[numexp].X_add_number = TIC80_OPERAND_M_SI | TIC80_OPERAND_M_LI; |
| } |
| else if (*p == 's') |
| { |
| p++; |
| /* This is a ":s" modifier. */ |
| exp[numexp].X_add_number = TIC80_OPERAND_SCALED; |
| } |
| else |
| { |
| as_bad (_("':' not followed by 'm' or 's'")); |
| } |
| numexp++; |
| continue; |
| } |
| |
| /* Handle leading '(' on operands that use them, by recording that we |
| have entered a paren nesting level and then continuing. We complain |
| about multiple nesting. */ |
| |
| if (*p == '(') |
| { |
| if (++parens != 1) |
| as_bad (_("paren nesting")); |
| |
| p++; |
| continue; |
| } |
| |
| /* Handle trailing ')' on operands that use them, by reducing the |
| nesting level and then continuing. We complain if there were too |
| many closures. */ |
| |
| if (*p == ')') |
| { |
| /* Record that we have left a paren group and continue. */ |
| if (--parens < 0) |
| as_bad (_("mismatched parenthesis")); |
| |
| p++; |
| continue; |
| } |
| |
| /* Begin operand parsing at the current scan point. */ |
| |
| input_line_pointer = p; |
| expression (&exp[numexp]); |
| |
| if (exp[numexp].X_op == O_illegal) |
| { |
| as_bad (_("illegal operand")); |
| } |
| else if (exp[numexp].X_op == O_absent) |
| { |
| as_bad (_("missing operand")); |
| } |
| |
| numexp++; |
| p = input_line_pointer; |
| } |
| |
| if (parens) |
| { |
| exp[numexp].X_op = O_absent; |
| exp[numexp++].X_add_number = TIC80_OPERAND_PARENS; |
| } |
| |
| /* Mark the end of the valid operands with an illegal expression. */ |
| exp[numexp].X_op = O_illegal; |
| |
| return (numexp); |
| } |
| |
| /* find_opcode() gets a pointer to the entry in the opcode table that |
| matches the instruction being assembled, or returns NULL if no such match |
| is found. |
| |
| First it parses all the operands and save them as expressions. Note that |
| we use O_absent expressions to record additional information about the |
| previous non-O_absent expression, such as ":m" or ":s" modifiers or |
| register numbers enclosed in parens like "(r10)". |
| |
| It then looks at all opcodes with the same name and uses the operands to |
| choose the correct opcode. */ |
| |
| static struct tic80_opcode * |
| find_opcode (opcode, myops) |
| struct tic80_opcode *opcode; |
| expressionS myops[]; |
| { |
| int numexp; /* Number of expressions from parsing operands */ |
| int expi; /* Index of current expression to match */ |
| int opi; /* Index of current operand to match */ |
| int match = 0; /* Set to 1 when an operand match is found */ |
| struct tic80_opcode *opc = opcode; /* Pointer to current opcode table entry */ |
| const struct tic80_opcode *end; /* Pointer to end of opcode table */ |
| |
| /* First parse all the operands so we only have to do it once. There may |
| be more expressions generated than there are operands. */ |
| |
| numexp = get_operands (myops); |
| |
| /* For each opcode with the same name, try to match it against the parsed |
| operands. */ |
| |
| end = tic80_opcodes + tic80_num_opcodes; |
| while (!match && (opc < end) && (strcmp (opc->name, opcode->name) == 0)) |
| { |
| /* Start off assuming a match. If we find a mismatch, then this is |
| reset and the operand/expr matching loop terminates with match |
| equal to zero, which allows us to try the next opcode. */ |
| |
| match = 1; |
| |
| /* For each expression, try to match it against the current operand |
| for the current opcode. Upon any mismatch, we abandon further |
| matching for the current opcode table entry. */ |
| |
| for (expi = 0, opi = -1; (expi < numexp) && match; expi++) |
| { |
| int bits, flags, X_op, num; |
| |
| X_op = myops[expi].X_op; |
| num = myops[expi].X_add_number; |
| |
| /* The O_absent expressions apply to the same operand as the most |
| recent non O_absent expression. So only increment the operand |
| index when the current expression is not one of these special |
| expressions. */ |
| |
| if (X_op != O_absent) |
| { |
| opi++; |
| } |
| |
| flags = tic80_operands[opc->operands[opi]].flags; |
| bits = tic80_operands[opc->operands[opi]].bits; |
| |
| switch (X_op) |
| { |
| case O_register: |
| /* Also check that registers that are supposed to be |
| even actually are even. */ |
| if (((flags & TIC80_OPERAND_GPR) != (num & TIC80_OPERAND_GPR)) || |
| ((flags & TIC80_OPERAND_FPA) != (num & TIC80_OPERAND_FPA)) || |
| ((flags & TIC80_OPERAND_CR) != (num & TIC80_OPERAND_CR)) || |
| ((flags & TIC80_OPERAND_EVEN) && (num & 1)) || |
| const_overflow (num & ~TIC80_OPERAND_MASK, bits, flags)) |
| { |
| match = 0; |
| } |
| break; |
| case O_constant: |
| if ((flags & TIC80_OPERAND_ENDMASK) && (num == 32)) |
| { |
| /* Endmask values of 0 and 32 give identical |
| results. */ |
| num = 0; |
| } |
| if ((flags & (TIC80_OPERAND_FPA | TIC80_OPERAND_GPR)) || |
| const_overflow (num, bits, flags)) |
| { |
| match = 0; |
| } |
| break; |
| case O_symbol: |
| if ((bits < 32) && (flags & TIC80_OPERAND_PCREL) |
| && !tic80_relax) |
| { |
| /* The default is to prefer the short form of PC |
| relative relocations. This is the only form that |
| the TI assembler supports. If the -relax option |
| is given, we never use the short forms. |
| FIXME: Should be able to choose "best-fit". */ |
| } |
| else if ((bits == 32) |
| #if 0 |
| && (flags & TIC80_OPERAND_BASEREL) |
| #endif |
| ) |
| { |
| /* The default is to prefer the long form of base |
| relative relocations. This is the only form that |
| the TI assembler supports. If the -no-relax |
| option is given, we always use the long form of |
| PC relative relocations. |
| FIXME: Should be able to choose "best-fit". */ |
| } |
| else |
| { |
| /* Symbols that don't match one of the above cases are |
| rejected as an operand. */ |
| match = 0; |
| } |
| break; |
| case O_absent: |
| /* If this is an O_absent expression, then it may be an |
| expression that supplies additional information about |
| the operand, such as ":m" or ":s" modifiers. Check to |
| see that the operand matches this requirement. */ |
| if (!((num & TIC80_OPERAND_M_SI) && (flags & TIC80_OPERAND_M_SI) |
| || (num & TIC80_OPERAND_M_LI) && (flags & TIC80_OPERAND_M_LI) |
| || (num & TIC80_OPERAND_SCALED) && (flags & TIC80_OPERAND_SCALED))) |
| { |
| match = 0; |
| } |
| break; |
| case O_big: |
| if ((num > 0) || !(flags & TIC80_OPERAND_FLOAT)) |
| { |
| match = 0; |
| } |
| break; |
| case O_illegal: |
| case O_symbol_rva: |
| case O_uminus: |
| case O_bit_not: |
| case O_logical_not: |
| case O_multiply: |
| case O_divide: |
| case O_modulus: |
| case O_left_shift: |
| case O_right_shift: |
| case O_bit_inclusive_or: |
| case O_bit_or_not: |
| case O_bit_exclusive_or: |
| case O_bit_and: |
| case O_add: |
| case O_subtract: |
| case O_eq: |
| case O_ne: |
| case O_lt: |
| case O_le: |
| case O_ge: |
| case O_gt: |
| case O_logical_and: |
| case O_logical_or: |
| case O_max: |
| default: |
| internal_error_a (_("unhandled expression type"), X_op); |
| } |
| } |
| if (!match) |
| opc++; |
| } |
| |
| return (match ? opc : NULL); |
| |
| #if 0 |
| /* Now search the opcode table table for one with operands that |
| matches what we've got. */ |
| |
| while (!match) |
| { |
| match = 1; |
| for (i = 0; opcode->operands[i]; i++) |
| { |
| int flags = tic80_operands[opcode->operands[i]].flags; |
| int X_op = myops[i].X_op; |
| int num = myops[i].X_add_number; |
| |
| if (X_op == 0) |
| { |
| match = 0; |
| break; |
| } |
| |
| if (flags |
| & (TIC80_OPERAND_GPR | TIC80_OPERAND_FPA | TIC80_OPERAND_CR)) |
| { |
| if ((X_op != O_register) || |
| ((flags & TIC80_OPERAND_GPR) != (num & TIC80_OPERAND_GPR)) || |
| ((flags & TIC80_OPERAND_FPA) != (num & TIC80_OPERAND_FPA)) || |
| ((flags & TIC80_OPERAND_CR) != (num & TIC80_OPERAND_CR))) |
| { |
| match = 0; |
| break; |
| } |
| } |
| |
| if (((flags & TIC80_OPERAND_MINUS) && ((X_op != O_absent) || (num != TIC80_OPERAND_MINUS))) || |
| ((flags & TIC80_OPERAND_PLUS) && ((X_op != O_absent) || (num != TIC80_OPERAND_PLUS))) || |
| ((flags & TIC80_OPERAND_ATMINUS) && ((X_op != O_absent) || (num != TIC80_OPERAND_ATMINUS))) || |
| ((flags & TIC80_OPERAND_ATPAR) && ((X_op != O_absent) || (num != TIC80_OPERAND_ATPAR))) || |
| ((flags & TIC80_OPERAND_ATSIGN) && ((X_op != O_absent) || (num != TIC80_OPERAND_ATSIGN)))) |
| { |
| match = 0; |
| break; |
| } |
| } |
| /* We're only done if the operands matched so far AND there |
| are no more to check. */ |
| if (match && myops[i].X_op == 0) |
| break; |
| else |
| match = 0; |
| |
| next_opcode = opcode + 1; |
| if (next_opcode->opcode == 0) |
| break; |
| if (strcmp (next_opcode->name, opcode->name)) |
| break; |
| opcode = next_opcode; |
| } |
| |
| if (!match) |
| { |
| as_bad (_("bad opcode or operands")); |
| return (0); |
| } |
| |
| /* Check that all registers that are required to be even are. |
| Also, if any operands were marked as registers, but were really |
| symbols, fix that here. */ |
| for (i = 0; opcode->operands[i]; i++) |
| { |
| if ((tic80_operands[opcode->operands[i]].flags & TIC80_OPERAND_EVEN) |
| && (myops[i].X_add_number & 1)) |
| as_fatal (_("Register number must be EVEN")); |
| if (myops[i].X_op == O_register) |
| { |
| if (!(tic80_operands[opcode->operands[i]].flags & TIC80_OPERAND_REG)) |
| { |
| myops[i].X_op = O_symbol; |
| myops[i].X_add_symbol = |
| symbol_find_or_make ((char *) myops[i].X_op_symbol); |
| myops[i].X_add_number = 0; |
| myops[i].X_op_symbol = NULL; |
| } |
| } |
| } |
| #endif |
| } |
| |
| /* build_insn takes a pointer to the opcode entry in the opcode table |
| and the array of operand expressions and writes out the instruction. |
| |
| Note that the opcode word and extended word may be written to different |
| frags, with the opcode at the end of one frag and the extension at the |
| beginning of the next. */ |
| |
| static void |
| build_insn (opcode, opers) |
| struct tic80_opcode *opcode; |
| expressionS *opers; |
| { |
| int expi; /* Index of current expression to match */ |
| int opi; /* Index of current operand to match */ |
| unsigned long insn[2]; /* Instruction and long immediate (if any) */ |
| char *f; /* Pointer to frag location for insn[0] */ |
| fragS *ffrag; /* Frag containing location f */ |
| char *fx = NULL; /* Pointer to frag location for insn[1] */ |
| fragS *fxfrag; /* Frag containing location fx */ |
| |
| /* Start with the raw opcode bits from the opcode table. */ |
| insn[0] = opcode->opcode; |
| |
| /* We are going to insert at least one 32 bit opcode so get the |
| frag now. */ |
| |
| f = frag_more (4); |
| ffrag = frag_now; |
| |
| /* For each operand expression, insert the appropriate bits into the |
| instruction. */ |
| for (expi = 0, opi = -1; opers[expi].X_op != O_illegal; expi++) |
| { |
| int bits, shift, flags, X_op, num; |
| |
| X_op = opers[expi].X_op; |
| num = opers[expi].X_add_number; |
| |
| /* The O_absent expressions apply to the same operand as the most |
| recent non O_absent expression. So only increment the operand |
| index when the current expression is not one of these special |
| expressions. */ |
| |
| if (X_op != O_absent) |
| { |
| opi++; |
| } |
| |
| flags = tic80_operands[opcode->operands[opi]].flags; |
| bits = tic80_operands[opcode->operands[opi]].bits; |
| shift = tic80_operands[opcode->operands[opi]].shift; |
| |
| switch (X_op) |
| { |
| case O_register: |
| num &= ~TIC80_OPERAND_MASK; |
| insn[0] = insn[0] | (num << shift); |
| break; |
| case O_constant: |
| if ((flags & TIC80_OPERAND_ENDMASK) && (num == 32)) |
| { |
| /* Endmask values of 0 and 32 give identical results. */ |
| num = 0; |
| } |
| else if ((flags & TIC80_OPERAND_BITNUM)) |
| { |
| /* BITNUM values are stored in one's complement form. */ |
| num = (~num & 0x1F); |
| } |
| /* Mask off upper bits, just it case it is signed and is |
| negative. */ |
| if (bits < 32) |
| { |
| num &= (1 << bits) - 1; |
| insn[0] = insn[0] | (num << shift); |
| } |
| else |
| { |
| fx = frag_more (4); |
| fxfrag = frag_now; |
| insn[1] = num; |
| } |
| break; |
| case O_symbol: |
| if (bits == 32) |
| { |
| fx = frag_more (4); |
| fxfrag = frag_now; |
| insn[1] = 0; |
| if (flags & TIC80_OPERAND_PCREL) |
| { |
| fix_new_exp (fxfrag, |
| fx - (fxfrag->fr_literal), |
| 4, |
| &opers[expi], |
| 1, |
| R_MPPCR); |
| } |
| else |
| { |
| fix_new_exp (fxfrag, |
| fx - (fxfrag->fr_literal), |
| 4, |
| &opers[expi], |
| 0, |
| R_RELLONGX); |
| } |
| } |
| else if (flags & TIC80_OPERAND_PCREL) |
| { |
| fix_new_exp (ffrag, |
| f - (ffrag->fr_literal), |
| 4, /* FIXME! how is this used? */ |
| &opers[expi], |
| 1, |
| R_MPPCR15W); |
| } |
| else |
| { |
| internal_error (_("symbol reloc that is not PC relative or 32 bits")); |
| } |
| break; |
| case O_absent: |
| /* Each O_absent expression can indicate exactly one |
| possible modifier. */ |
| if ((num & TIC80_OPERAND_M_SI) |
| && (flags & TIC80_OPERAND_M_SI)) |
| { |
| insn[0] = insn[0] | (1 << 17); |
| } |
| else if ((num & TIC80_OPERAND_M_LI) |
| && (flags & TIC80_OPERAND_M_LI)) |
| { |
| insn[0] = insn[0] | (1 << 15); |
| } |
| else if ((num & TIC80_OPERAND_SCALED) |
| && (flags & TIC80_OPERAND_SCALED)) |
| { |
| insn[0] = insn[0] | (1 << 11); |
| } |
| else if ((num & TIC80_OPERAND_PARENS) |
| && (flags & TIC80_OPERAND_PARENS)) |
| { |
| /* No code to generate, just accept and discard this |
| expression. */ |
| } |
| else |
| { |
| internal_error_a (_("unhandled operand modifier"), |
| opers[expi].X_add_number); |
| } |
| break; |
| case O_big: |
| fx = frag_more (4); |
| fxfrag = frag_now; |
| { |
| int precision = 2; |
| long exponent_bits = 8L; |
| LITTLENUM_TYPE words[2]; |
| /* Value is still in generic_floating_point_number. */ |
| gen_to_words (words, precision, exponent_bits); |
| insn[1] = (words[0] << 16) | words[1]; |
| } |
| break; |
| case O_illegal: |
| case O_symbol_rva: |
| case O_uminus: |
| case O_bit_not: |
| case O_logical_not: |
| case O_multiply: |
| case O_divide: |
| case O_modulus: |
| case O_left_shift: |
| case O_right_shift: |
| case O_bit_inclusive_or: |
| case O_bit_or_not: |
| case O_bit_exclusive_or: |
| case O_bit_and: |
| case O_add: |
| case O_subtract: |
| case O_eq: |
| case O_ne: |
| case O_lt: |
| case O_le: |
| case O_ge: |
| case O_gt: |
| case O_logical_and: |
| case O_logical_or: |
| case O_max: |
| default: |
| internal_error_a (_("unhandled expression"), X_op); |
| break; |
| } |
| } |
| |
| /* Write out the instruction, either 4 or 8 bytes. */ |
| |
| md_number_to_chars (f, insn[0], 4); |
| if (fx != NULL) |
| { |
| md_number_to_chars (fx, insn[1], 4); |
| } |
| } |
| |
| /* This is the main entry point for the machine-dependent assembler. Gas |
| calls this function for each input line which does not contain a |
| pseudoop. |
| |
| STR points to a NULL terminated machine dependent instruction. This |
| function is supposed to emit the frags/bytes it assembles to. */ |
| |
| void |
| md_assemble (str) |
| char *str; |
| { |
| char *scan; |
| unsigned char *input_line_save; |
| struct tic80_opcode *opcode; |
| expressionS myops[16]; |
| unsigned long insn; |
| |
| /* Ensure there is something there to assemble. */ |
| assert (str); |
| |
| /* Drop any leading whitespace. */ |
| while (isspace (*str)) |
| str++; |
| |
| /* Isolate the mnemonic from the rest of the string by finding the first |
| whitespace character and zapping it to a null byte. */ |
| for (scan = str; *scan != '\000' && !isspace (*scan); scan++) |
| ; |
| |
| if (*scan != '\000') |
| *scan++ = '\000'; |
| |
| /* Try to find this mnemonic in the hash table. */ |
| if ((opcode = (struct tic80_opcode *) hash_find (tic80_hash, str)) == NULL) |
| { |
| as_bad (_("Invalid mnemonic: '%s'"), str); |
| return; |
| } |
| |
| str = scan; |
| while (isspace (*scan)) |
| scan++; |
| |
| input_line_save = input_line_pointer; |
| input_line_pointer = str; |
| |
| opcode = find_opcode (opcode, myops); |
| if (opcode == NULL) |
| as_bad (_("Invalid operands: '%s'"), input_line_save); |
| |
| input_line_pointer = input_line_save; |
| build_insn (opcode, myops); |
| } |
| |
| /* This function is called once at the start of assembly, after the command |
| line arguments have been parsed and all the machine independent |
| initializations have been completed. |
| |
| It should set up all the tables, etc., that the machine dependent part of |
| the assembler will need. */ |
| |
| void |
| md_begin () |
| { |
| char *prev_name = ""; |
| register const struct tic80_opcode *op; |
| register const struct tic80_opcode *op_end; |
| const struct predefined_symbol *pdsp; |
| extern int coff_flags; /* Defined in obj-coff.c */ |
| |
| /* Set F_AR32WR in coff_flags, which will end up in the file header |
| f_flags field. */ |
| |
| coff_flags |= F_AR32WR; /* TIc80 is 32 bit little endian. */ |
| |
| /* Insert unique names into hash table. The TIc80 instruction set |
| has many identical opcode names that have different opcodes based |
| on the operands. This hash table then provides a quick index to |
| the first opcode with a particular name in the opcode table. */ |
| |
| tic80_hash = hash_new (); |
| op_end = tic80_opcodes + tic80_num_opcodes; |
| for (op = tic80_opcodes; op < op_end; op++) |
| { |
| if (strcmp (prev_name, op->name) != 0) |
| { |
| prev_name = (char *) op->name; |
| hash_insert (tic80_hash, op->name, (char *) op); |
| } |
| } |
| |
| /* Insert the predefined symbols into the symbol table. We use |
| symbol_create rather than symbol_new so that these symbols don't |
| end up in the object files' symbol table. Note that the values |
| of the predefined symbols include some upper bits that |
| distinguish the type of the symbol (register, bitnum, condition |
| code, etc) and these bits must be masked away before actually |
| inserting the values into the instruction stream. For registers |
| we put these bits in the symbol table since we use them later and |
| there is no question that they aren't part of the register |
| number. For constants we can't do that since the constant can be |
| any value, so they are masked off before putting them into the |
| symbol table. */ |
| |
| pdsp = NULL; |
| while ((pdsp = tic80_next_predefined_symbol (pdsp)) != NULL) |
| { |
| segT segment; |
| valueT valu; |
| int symtype; |
| |
| symtype = PDS_VALUE (pdsp) & TIC80_OPERAND_MASK; |
| switch (symtype) |
| { |
| case TIC80_OPERAND_GPR: |
| case TIC80_OPERAND_FPA: |
| case TIC80_OPERAND_CR: |
| segment = reg_section; |
| valu = PDS_VALUE (pdsp); |
| break; |
| case TIC80_OPERAND_CC: |
| case TIC80_OPERAND_BITNUM: |
| segment = absolute_section; |
| valu = PDS_VALUE (pdsp) & ~TIC80_OPERAND_MASK; |
| break; |
| default: |
| internal_error_a (_("unhandled predefined symbol bits"), symtype); |
| break; |
| } |
| symbol_table_insert (symbol_create (PDS_NAME (pdsp), segment, valu, |
| &zero_address_frag)); |
| } |
| } |
| |
| /* The assembler adds md_shortopts to the string passed to getopt. */ |
| |
| CONST char *md_shortopts = ""; |
| |
| /* The assembler adds md_longopts to the machine independent long options |
| that are passed to getopt. */ |
| |
| struct option md_longopts[] = { |
| |
| #define OPTION_RELAX (OPTION_MD_BASE) |
| {"relax", no_argument, NULL, OPTION_RELAX}, |
| |
| #define OPTION_NO_RELAX (OPTION_RELAX + 1) |
| {"no-relax", no_argument, NULL, OPTION_NO_RELAX}, |
| |
| {NULL, no_argument, NULL, 0} |
| }; |
| |
| size_t md_longopts_size = sizeof (md_longopts); |
| |
| /* The md_parse_option function will be called whenever getopt returns an |
| unrecognized code, presumably indicating a special code value which |
| appears in md_longopts for machine specific command line options. */ |
| |
| int |
| md_parse_option (c, arg) |
| int c; |
| char *arg; |
| { |
| switch (c) |
| { |
| case OPTION_RELAX: |
| tic80_relax = 1; |
| break; |
| case OPTION_NO_RELAX: |
| tic80_relax = 0; |
| break; |
| default: |
| return (0); |
| } |
| return (1); |
| } |
| |
| /* The md_show_usage function will be called whenever a usage message is |
| printed. It should print a description of the machine specific options |
| found in md_longopts. */ |
| |
| void |
| md_show_usage (stream) |
| FILE *stream; |
| { |
| fprintf (stream, "\ |
| TIc80 options:\n\ |
| -relax alter PC relative branch instructions to use long form when needed\n\ |
| -no-relax always use short PC relative branch instructions, error on overflow\n"); |
| } |
| |
| /* Attempt to simplify or even eliminate a fixup. The return value is |
| ignored; perhaps it was once meaningful, but now it is historical. |
| To indicate that a fixup has been eliminated, set fixP->fx_done. */ |
| |
| void |
| md_apply_fix (fixP, val) |
| fixS *fixP; |
| long val; |
| { |
| char *dest = fixP->fx_frag->fr_literal + fixP->fx_where; |
| int overflow; |
| |
| switch (fixP->fx_r_type) |
| { |
| case R_RELLONGX: |
| md_number_to_chars (dest, (valueT) val, 4); |
| break; |
| case R_MPPCR: |
| val >>= 2; |
| val += 1; /* Target address computed from inst start */ |
| md_number_to_chars (dest, (valueT) val, 4); |
| break; |
| case R_MPPCR15W: |
| overflow = (val < -65536L) || (val > 65532L); |
| if (overflow) |
| { |
| as_bad_where (fixP->fx_file, fixP->fx_line, |
| _("PC offset 0x%lx outside range 0x%lx-0x%lx"), |
| val, -65536L, 65532L); |
| } |
| else |
| { |
| val >>= 2; |
| *dest++ = val & 0xFF; |
| val >>= 8; |
| *dest = (*dest & 0x80) | (val & 0x7F); |
| } |
| break; |
| case R_ABS: |
| md_number_to_chars (dest, (valueT) val, fixP->fx_size); |
| break; |
| default: |
| internal_error_a (_("unhandled relocation type in fixup"), |
| fixP->fx_r_type); |
| break; |
| } |
| } |
| |
| /* Functions concerning relocs. */ |
| |
| /* The location from which a PC relative jump should be calculated, |
| given a PC relative reloc. |
| |
| For the TIc80, this is the address of the 32 bit opcode containing |
| the PC relative field. */ |
| |
| long |
| md_pcrel_from (fixP) |
| fixS *fixP; |
| { |
| return (fixP->fx_frag->fr_address + fixP->fx_where); |
| } |
| |
| /* Called after relax() is finished. |
| * In: Address of frag. |
| * fr_type == rs_machine_dependent. |
| * fr_subtype is what the address relaxed to. |
| * |
| * Out: Any fixSs and constants are set up. |
| * Caller will turn frag into a ".space 0". |
| */ |
| |
| void |
| md_convert_frag (headers, seg, fragP) |
| object_headers *headers; |
| segT seg; |
| fragS *fragP; |
| { |
| internal_error (_("md_convert_frag() not implemented yet")); |
| abort (); |
| } |
| |
| void |
| tc_coff_symbol_emit_hook (ignore) |
| symbolS *ignore; |
| { |
| } |
| |
| #if defined OBJ_COFF |
| |
| short |
| tc_coff_fix2rtype (fixP) |
| fixS *fixP; |
| { |
| return (fixP->fx_r_type); |
| } |
| |
| #endif /* OBJ_COFF */ |