diff options
Diffstat (limited to 'gas/config/tc-arc.c')
| -rw-r--r-- | gas/config/tc-arc.c | 1484 |
1 files changed, 0 insertions, 1484 deletions
diff --git a/gas/config/tc-arc.c b/gas/config/tc-arc.c deleted file mode 100644 index 3aafea36481..00000000000 --- a/gas/config/tc-arc.c +++ /dev/null @@ -1,1484 +0,0 @@ -/* tc-arc.c -- Assembler for the ARC - Copyright (C) 1994, 1995, 1997, 1998, 1999 Free Software Foundation, Inc. - Contributed by Doug Evans (dje@cygnus.com). - - 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 <stdio.h> -#include <ctype.h> -#include "as.h" -#include "subsegs.h" -#include "opcode/arc.h" -#include "elf/arc.h" - -extern int arc_get_mach PARAMS ((char *)); - -static arc_insn arc_insert_operand PARAMS ((arc_insn, - const struct arc_operand *, int, - const struct arc_operand_value *, - offsetT, char *, unsigned int)); -static void arc_common PARAMS ((int)); -static void arc_cpu PARAMS ((int)); -/*static void arc_rename PARAMS ((int));*/ -static int get_arc_exp_reloc_type PARAMS ((int, int, expressionS *, - expressionS *)); - -const pseudo_typeS md_pseudo_table[] = -{ - { "align", s_align_bytes, 0 }, /* Defaulting is invalid (0) */ - { "common", arc_common, 0 }, -/*{ "hword", cons, 2 }, - already exists */ - { "word", cons, 4 }, -/*{ "xword", cons, 8 },*/ - { "cpu", arc_cpu, 0 }, -/*{ "rename", arc_rename, 0 },*/ - { NULL, 0, 0 }, -}; - -/* 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 started like this one will always - work if '/' isn't otherwise defined. */ -const char line_comment_chars[] = "#"; - -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[] = "rRsSfFdD"; - -/* Byte order. */ -extern int target_big_endian; -const char *arc_target_format = DEFAULT_TARGET_FORMAT; -static int byte_order = DEFAULT_BYTE_ORDER; - -/* One of bfd_mach_arc_xxx. */ -static int arc_mach_type = bfd_mach_arc_base; - -/* Non-zero if the cpu type has been explicitly specified. */ -static int mach_type_specified_p = 0; - -/* Non-zero if opcode tables have been initialized. - A .cpu command must appear before any instructions. */ -static int cpu_tables_init_p = 0; - -static struct hash_control *arc_suffix_hash = NULL; - -const char *md_shortopts = ""; -struct option md_longopts[] = -{ -#define OPTION_EB (OPTION_MD_BASE + 0) - {"EB", no_argument, NULL, OPTION_EB}, -#define OPTION_EL (OPTION_MD_BASE + 1) - {"EL", no_argument, NULL, OPTION_EL}, - { NULL, no_argument, NULL, 0 } -}; -size_t md_longopts_size = sizeof (md_longopts); - -/* - * md_parse_option - * - * Invocation line includes a switch not recognized by the base assembler. - * See if it's a processor-specific option. - */ - -int -md_parse_option (c, arg) - int c; - char *arg; -{ - switch (c) - { - case OPTION_EB: - byte_order = BIG_ENDIAN; - arc_target_format = "elf32-bigarc"; - break; - case OPTION_EL: - byte_order = LITTLE_ENDIAN; - arc_target_format = "elf32-littlearc"; - break; - default: - return 0; - } - return 1; -} - -void -md_show_usage (stream) - FILE *stream; -{ - fprintf (stream, _("\ -ARC options:\n\ --EB generate big endian output\n\ --EL generate little endian output\n")); -} - -/* 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. - Opcode selection is defered until later because we might see a .cpu - command. */ - -void -md_begin () -{ - /* The endianness can be chosen "at the factory". */ - target_big_endian = byte_order == BIG_ENDIAN; - - if (!bfd_set_arch_mach (stdoutput, bfd_arch_arc, arc_mach_type)) - as_warn (_("could not set architecture and machine")); - - /* Assume the base cpu. This call is necessary because we need to - initialize `arc_operand_map' which may be needed before we see the - first insn. */ - arc_opcode_init_tables (arc_get_opcode_mach (bfd_mach_arc_base, - target_big_endian)); -} - -/* Initialize the various opcode and operand tables. - MACH is one of bfd_mach_arc_xxx. */ - -static void -init_opcode_tables (mach) - int mach; -{ - register unsigned int i; - char *last; - - if ((arc_suffix_hash = hash_new ()) == NULL) - as_fatal (_("virtual memory exhausted")); - - if (!bfd_set_arch_mach (stdoutput, bfd_arch_arc, mach)) - as_warn (_("could not set architecture and machine")); - - /* This initializes a few things in arc-opc.c that we need. - This must be called before the various arc_xxx_supported fns. */ - arc_opcode_init_tables (arc_get_opcode_mach (mach, target_big_endian)); - - /* Only put the first entry of each equivalently named suffix in the - table. */ - last = ""; - for (i = 0; i < arc_suffixes_count; i++) - { - if (! arc_opval_supported (&arc_suffixes[i])) - continue; - if (strcmp (arc_suffixes[i].name, last) != 0) - hash_insert (arc_suffix_hash, arc_suffixes[i].name, (PTR) (arc_suffixes + i)); - last = arc_suffixes[i].name; - } - - /* Since registers don't have a prefix, we put them in the symbol table so - they can't be used as symbols. This also simplifies argument parsing as - we can let gas parse registers for us. The recorded register number is - the index in `arc_reg_names'. */ - for (i = 0; i < arc_reg_names_count; i++) - { - if (! arc_opval_supported (&arc_reg_names[i])) - continue; - /* Use symbol_create here instead of symbol_new so we don't try to - output registers into the object file's symbol table. */ - symbol_table_insert (symbol_create (arc_reg_names[i].name, reg_section, - i, &zero_address_frag)); - } - - /* Tell `s_cpu' it's too late. */ - cpu_tables_init_p = 1; -} - -/* Insert an operand value into an instruction. - If REG is non-NULL, it is a register number and ignore VAL. */ - -static arc_insn -arc_insert_operand (insn, operand, mods, reg, val, file, line) - arc_insn insn; - const struct arc_operand *operand; - int mods; - const struct arc_operand_value *reg; - offsetT val; - char *file; - unsigned int line; -{ - if (operand->bits != 32) - { - long min, max; - offsetT test; - - if ((operand->flags & ARC_OPERAND_SIGNED) != 0) - { - if ((operand->flags & ARC_OPERAND_SIGNOPT) != 0) - max = (1 << operand->bits) - 1; - else - max = (1 << (operand->bits - 1)) - 1; - min = - (1 << (operand->bits - 1)); - } - else - { - max = (1 << operand->bits) - 1; - min = 0; - } - - if ((operand->flags & ARC_OPERAND_NEGATIVE) != 0) - test = - val; - else - test = val; - - if (test < (offsetT) min || test > (offsetT) max) - { - const char *err = - _("operand out of range (%s not between %ld and %ld)"); - char buf[100]; - - sprint_value (buf, test); - if (file == (char *) NULL) - as_warn (err, buf, min, max); - else - as_warn_where (file, line, err, buf, min, max); - } - } - - if (operand->insert) - { - const char *errmsg; - - errmsg = NULL; - insn = (*operand->insert) (insn, operand, mods, reg, (long) val, &errmsg); - if (errmsg != (const char *) NULL) - as_warn (errmsg); - } - else - insn |= (((long) val & ((1 << operand->bits) - 1)) - << operand->shift); - - return insn; -} - -/* We need to keep a list of fixups. We can't simply generate them as - we go, because that would require us to first create the frag, and - that would screw up references to ``.''. */ - -struct arc_fixup -{ - /* index into `arc_operands' */ - int opindex; - expressionS exp; -}; - -#define MAX_FIXUPS 5 - -#define MAX_SUFFIXES 5 - -/* This routine is called for each instruction to be assembled. */ - -void -md_assemble (str) - char *str; -{ - const struct arc_opcode *opcode; - char *start; - arc_insn insn; - static int init_tables_p = 0; - - /* Opcode table initialization is deferred until here because we have to - wait for a possible .cpu command. */ - if (!init_tables_p) - { - init_opcode_tables (arc_mach_type); - init_tables_p = 1; - } - - /* Skip leading white space. */ - while (isspace (*str)) - str++; - - /* The instructions are stored in lists hashed by the first letter (though - we needn't care how they're hashed). Get the first in the list. */ - - opcode = arc_opcode_lookup_asm (str); - - /* Keep looking until we find a match. */ - - start = str; - for ( ; opcode != NULL; opcode = ARC_OPCODE_NEXT_ASM (opcode)) - { - int past_opcode_p, fc, num_suffixes; - char *syn; - struct arc_fixup fixups[MAX_FIXUPS]; - /* Used as a sanity check. If we need a limm reloc, make sure we ask - for an extra 4 bytes from frag_more. */ - int limm_reloc_p; - const struct arc_operand_value *insn_suffixes[MAX_SUFFIXES]; - - /* Is this opcode supported by the selected cpu? */ - if (! arc_opcode_supported (opcode)) - continue; - - /* Scan the syntax string. If it doesn't match, try the next one. */ - - arc_opcode_init_insert (); - insn = opcode->value; - fc = 0; - past_opcode_p = 0; - num_suffixes = 0; - limm_reloc_p = 0; - - /* We don't check for (*str != '\0') here because we want to parse - any trailing fake arguments in the syntax string. */ - for (str = start, syn = opcode->syntax; *syn != '\0'; ) - { - int mods; - const struct arc_operand *operand; - - /* Non operand chars must match exactly. */ - if (*syn != '%' || *++syn == '%') - { - /* Handle '+' specially as we want to allow "ld r0,[sp-4]". */ - /* ??? The syntax has changed to [sp,-4]. */ - if (0 && *syn == '+' && *str == '-') - { - /* Skip over syn's +, but leave str's - alone. - That makes the case identical to "ld r0,[sp+-4]". */ - ++syn; - } - else if (*str == *syn) - { - if (*syn == ' ') - past_opcode_p = 1; - ++syn; - ++str; - } - else - break; - continue; - } - - /* We have an operand. Pick out any modifiers. */ - mods = 0; - while (ARC_MOD_P (arc_operands[arc_operand_map[*syn]].flags)) - { - mods |= arc_operands[arc_operand_map[*syn]].flags & ARC_MOD_BITS; - ++syn; - } - operand = arc_operands + arc_operand_map[*syn]; - if (operand->fmt == 0) - as_fatal (_("unknown syntax format character `%c'"), *syn); - - if (operand->flags & ARC_OPERAND_FAKE) - { - const char *errmsg = NULL; - if (operand->insert) - { - insn = (*operand->insert) (insn, operand, mods, NULL, 0, &errmsg); - /* If we get an error, go on to try the next insn. */ - if (errmsg) - break; - } - ++syn; - } - /* Are we finished with suffixes? */ - else if (!past_opcode_p) - { - int found; - char c; - char *s,*t; - const struct arc_operand_value *suf,*suffix,*suffix_end; - - if (!(operand->flags & ARC_OPERAND_SUFFIX)) - abort (); - - /* If we're at a space in the input string, we want to skip the - remaining suffixes. There may be some fake ones though, so - just go on to try the next one. */ - if (*str == ' ') - { - ++syn; - continue; - } - - s = str; - if (mods & ARC_MOD_DOT) - { - if (*s != '.') - break; - ++s; - } - else - { - /* This can happen in "b.nd foo" and we're currently looking - for "%q" (ie: a condition code suffix). */ - if (*s == '.') - { - ++syn; - continue; - } - } - - /* Pick the suffix out and look it up via the hash table. */ - for (t = s; *t && isalpha (*t); ++t) - continue; - c = *t; - *t = '\0'; - suf = hash_find (arc_suffix_hash, s); - *t = c; - if (!suf) - { - /* This can happen in "blle foo" and we're currently using - the template "b%q%.n %j". The "bl" insn occurs later in - the table so "lle" isn't an illegal suffix. */ - break; - } - - /* Is it the right type? Note that the same character is used - several times, so we have to examine all of them. This is - relatively efficient as equivalent entries are kept - together. If it's not the right type, don't increment `str' - so we try the next one in the series. */ - found = 0; - suffix_end = arc_suffixes + arc_suffixes_count; - for (suffix = suf; - suffix < suffix_end && strcmp (suffix->name, suf->name) == 0; - ++suffix) - { - if (arc_operands[suffix->type].fmt == *syn) - { - /* Insert the suffix's value into the insn. */ - if (operand->insert) - insn = (*operand->insert) (insn, operand, - mods, NULL, suffix->value, - NULL); - else - insn |= suffix->value << operand->shift; - - str = t; - found = 1; - break; - } - } - ++syn; - if (!found) - ; /* Wrong type. Just go on to try next insn entry. */ - else - { - if (num_suffixes == MAX_SUFFIXES) - as_bad (_("too many suffixes")); - else - insn_suffixes[num_suffixes++] = suffix; - } - } - else - /* This is either a register or an expression of some kind. */ - { - char c; - char *hold; - const struct arc_operand_value *reg = NULL; - long value = 0; - expressionS exp; - - if (operand->flags & ARC_OPERAND_SUFFIX) - abort (); - - /* Is there anything left to parse? - We don't check for this at the top because we want to parse - any trailing fake arguments in the syntax string. */ - if (*str == '\0') - break; -#if 0 - /* Is this a syntax character? Eg: is there a '[' present when - there shouldn't be? */ - if (!isalnum (*str) - /* '.' as in ".LLC0" */ - && *str != '.' - /* '_' as in "_print" */ - && *str != '_' - /* '-' as in "[fp,-4]" */ - && *str != '-' - /* '%' as in "%ia(_func)" */ - && *str != '%') - break; -#endif - - /* Parse the operand. */ - hold = input_line_pointer; - input_line_pointer = str; - expression (&exp); - str = input_line_pointer; - input_line_pointer = hold; - - if (exp.X_op == O_illegal) - as_bad (_("illegal operand")); - else if (exp.X_op == O_absent) - as_bad (_("missing operand")); - else if (exp.X_op == O_constant) - { - value = exp.X_add_number; - } - else if (exp.X_op == O_register) - { - reg = arc_reg_names + exp.X_add_number; - } - else - { - /* We need to generate a fixup for this expression. */ - if (fc >= MAX_FIXUPS) - as_fatal (_("too many fixups")); - fixups[fc].exp = exp; - - /* If this is a register constant (IE: one whose - register value gets stored as 61-63) then this - must be a limm. We don't support shimm relocs. */ - /* ??? This bit could use some cleaning up. - Referencing the format chars like this goes - against style. */ -#define IS_REG_OPERAND(o) ((o) == 'a' || (o) == 'b' || (o) == 'c') - if (IS_REG_OPERAND (*syn)) - { - const char *junk; - - fixups[fc].opindex = arc_operand_map['L']; - limm_reloc_p = 1; - /* Tell insert_reg we need a limm. This is - needed because the value at this point is - zero, a shimm. */ - /* ??? We need a cleaner interface than this. */ - (*arc_operands[arc_operand_map['Q']].insert) - (insn, operand, mods, reg, 0L, &junk); - } - else - fixups[fc].opindex = arc_operand_map[*syn]; - ++fc; - value = 0; - } - - /* Insert the register or expression into the instruction. */ - if (operand->insert) - { - const char *errmsg = NULL; - insn = (*operand->insert) (insn, operand, mods, - reg, (long) value, &errmsg); -#if 0 - if (errmsg != (const char *) NULL) - as_warn (errmsg); -#endif - /* FIXME: We want to try shimm insns for limm ones. But if - the constant won't fit, we must go on to try the next - possibility. Where do we issue warnings for constants - that are too big then? At present, we'll flag the insn - as unrecognizable! Maybe have the "bad instruction" - error message include our `errmsg'? */ - if (errmsg != (const char *) NULL) - break; - } - else - insn |= (value & ((1 << operand->bits) - 1)) << operand->shift; - - ++syn; - } - } - - /* If we're at the end of the syntax string, we're done. */ - /* FIXME: try to move this to a separate function. */ - if (*syn == '\0') - { - int i; - char *f; - long limm, limm_p; - - /* For the moment we assume a valid `str' can only contain blanks - now. IE: We needn't try again with a longer version of the - insn and it is assumed that longer versions of insns appear - before shorter ones (eg: lsr r2,r3,1 vs lsr r2,r3). */ - - while (isspace (*str)) - ++str; - - if (*str != '\0') - as_bad (_("junk at end of line: `%s'"), str); - - /* Is there a limm value? */ - limm_p = arc_opcode_limm_p (&limm); - - /* Perform various error and warning tests. */ - - { - static int in_delay_slot_p = 0; - static int prev_insn_needs_cc_nop_p = 0; - /* delay slot type seen */ - int delay_slot_type = ARC_DELAY_NONE; - /* conditional execution flag seen */ - int conditional = 0; - /* 1 if condition codes are being set */ - int cc_set_p = 0; - /* 1 if conditional branch, including `b' "branch always" */ - int cond_branch_p = opcode->flags & ARC_OPCODE_COND_BRANCH; - int need_cc_nop_p = 0; - - for (i = 0; i < num_suffixes; ++i) - { - switch (arc_operands[insn_suffixes[i]->type].fmt) - { - case 'n' : - delay_slot_type = insn_suffixes[i]->value; - break; - case 'q' : - conditional = insn_suffixes[i]->value; - break; - case 'f' : - cc_set_p = 1; - break; - } - } - - /* Putting an insn with a limm value in a delay slot is supposed to - be legal, but let's warn the user anyway. Ditto for 8 byte - jumps with delay slots. */ - if (in_delay_slot_p && limm_p) - as_warn (_("8 byte instruction in delay slot")); - if (delay_slot_type != ARC_DELAY_NONE && limm_p) - as_warn (_("8 byte jump instruction with delay slot")); - in_delay_slot_p = (delay_slot_type != ARC_DELAY_NONE) && !limm_p; - - /* Warn when a conditional branch immediately follows a set of - the condition codes. Note that this needn't be done if the - insn that sets the condition codes uses a limm. */ - if (cond_branch_p && conditional != 0 /* 0 = "always" */ - && prev_insn_needs_cc_nop_p) - as_warn (_("conditional branch follows set of flags")); - prev_insn_needs_cc_nop_p = cc_set_p && !limm_p; - } - - /* Write out the instruction. - It is important to fetch enough space in one call to `frag_more'. - We use (f - frag_now->fr_literal) to compute where we are and we - don't want frag_now to change between calls. */ - if (limm_p) - { - f = frag_more (8); - md_number_to_chars (f, insn, 4); - md_number_to_chars (f + 4, limm, 4); - } - else if (limm_reloc_p) - { - /* We need a limm reloc, but the tables think we don't. */ - abort (); - } - else - { - f = frag_more (4); - md_number_to_chars (f, insn, 4); - } - - /* Create any fixups. */ - for (i = 0; i < fc; ++i) - { - int op_type, reloc_type; - expressionS exptmp; - const struct arc_operand *operand; - - /* Create a fixup for this operand. - At this point we do not use a bfd_reloc_code_real_type for - operands residing in the insn, but instead just use the - operand index. This lets us easily handle fixups for any - operand type, although that is admittedly not a very exciting - feature. We pick a BFD reloc type in md_apply_fix. - - Limm values (4 byte immediate "constants") must be treated - normally because they're not part of the actual insn word - and thus the insertion routines don't handle them. */ - - if (arc_operands[fixups[i].opindex].flags & ARC_OPERAND_LIMM) - { - op_type = fixups[i].opindex; - /* FIXME: can we add this data to the operand table? */ - if (op_type == arc_operand_map['L']) - reloc_type = BFD_RELOC_32; - else if (op_type == arc_operand_map['J']) - reloc_type = BFD_RELOC_ARC_B26; - else - abort (); - reloc_type = get_arc_exp_reloc_type (1, reloc_type, - &fixups[i].exp, - &exptmp); - } - else - { - op_type = get_arc_exp_reloc_type (0, fixups[i].opindex, - &fixups[i].exp, &exptmp); - reloc_type = op_type + (int) BFD_RELOC_UNUSED; - } - operand = &arc_operands[op_type]; - fix_new_exp (frag_now, - ((f - frag_now->fr_literal) - + (operand->flags & ARC_OPERAND_LIMM ? 4 : 0)), 4, - &exptmp, - (operand->flags & ARC_OPERAND_RELATIVE_BRANCH) != 0, - (bfd_reloc_code_real_type) reloc_type); - } - - /* All done. */ - return; - } - - /* Try the next entry. */ - } - - as_bad (_("bad instruction `%s'"), start); -} - -/* ??? This was copied from tc-sparc.c, I think. Is it necessary? */ - -static void -arc_common (ignore) - int ignore; -{ - char *name; - char c; - char *p; - int temp, size; - symbolS *symbolP; - - name = input_line_pointer; - c = get_symbol_end (); - /* just after name is now '\0' */ - p = input_line_pointer; - *p = c; - SKIP_WHITESPACE (); - if (*input_line_pointer != ',') - { - as_bad (_("expected comma after symbol-name")); - ignore_rest_of_line (); - return; - } - input_line_pointer++; /* skip ',' */ - if ((temp = get_absolute_expression ()) < 0) - { - as_bad (_(".COMMon length (%d.) <0! Ignored."), temp); - ignore_rest_of_line (); - return; - } - size = temp; - *p = 0; - symbolP = symbol_find_or_make (name); - *p = c; - if (S_IS_DEFINED (symbolP) && ! S_IS_COMMON (symbolP)) - { - as_bad (_("ignoring attempt to re-define symbol")); - ignore_rest_of_line (); - return; - } - if (S_GET_VALUE (symbolP) != 0) - { - if (S_GET_VALUE (symbolP) != size) - { - as_warn (_("Length of .comm \"%s\" is already %ld. Not changed to %d."), - S_GET_NAME (symbolP), (long) S_GET_VALUE (symbolP), size); - } - } - assert (symbol_get_frag (symbolP) == &zero_address_frag); - if (*input_line_pointer != ',') - { - as_bad (_("expected comma after common length")); - ignore_rest_of_line (); - return; - } - input_line_pointer++; - SKIP_WHITESPACE (); - if (*input_line_pointer != '"') - { - temp = get_absolute_expression (); - if (temp < 0) - { - temp = 0; - as_warn (_("Common alignment negative; 0 assumed")); - } - if (symbolP->local) - { - segT old_sec; - int old_subsec; - char *p; - int align; - - allocate_bss: - old_sec = now_seg; - old_subsec = now_subseg; - align = temp; - record_alignment (bss_section, align); - subseg_set (bss_section, 0); - if (align) - frag_align (align, 0, 0); - if (S_GET_SEGMENT (symbolP) == bss_section) - symbol_get_frag (symbolP)->fr_symbol = 0; - symbol_set_frag (symbolP, frag_now); - p = frag_var (rs_org, 1, 1, (relax_substateT) 0, symbolP, - (offsetT) size, (char *) 0); - *p = 0; - S_SET_SEGMENT (symbolP, bss_section); - S_CLEAR_EXTERNAL (symbolP); - subseg_set (old_sec, old_subsec); - } - else - { - allocate_common: - S_SET_VALUE (symbolP, (valueT) size); - S_SET_ALIGN (symbolP, temp); - S_SET_EXTERNAL (symbolP); - S_SET_SEGMENT (symbolP, bfd_com_section_ptr); - } - } - else - { - input_line_pointer++; - /* ??? Some say data, some say bss. */ - if (strncmp (input_line_pointer, ".bss\"", 5) - && strncmp (input_line_pointer, ".data\"", 6)) - { - input_line_pointer--; - goto bad_common_segment; - } - while (*input_line_pointer++ != '"') - ; - goto allocate_common; - } - demand_empty_rest_of_line (); - return; - - { - bad_common_segment: - p = input_line_pointer; - while (*p && *p != '\n') - p++; - c = *p; - *p = '\0'; - as_bad (_("bad .common segment %s"), input_line_pointer + 1); - *p = c; - input_line_pointer = p; - ignore_rest_of_line (); - return; - } -} - -/* Select the cpu we're assembling for. */ - -static void -arc_cpu (ignore) - int ignore; -{ - int mach; - char c; - char *cpu; - - /* If an instruction has already been seen, it's too late. */ - if (cpu_tables_init_p) - { - as_bad (_(".cpu command must appear before any instructions")); - ignore_rest_of_line (); - return; - } - - cpu = input_line_pointer; - c = get_symbol_end (); - mach = arc_get_mach (cpu); - *input_line_pointer = c; - if (mach == -1) - goto bad_cpu; - - demand_empty_rest_of_line (); - - /* The cpu may have been selected on the command line. - The choices must match. */ - /* ??? This was a command line option early on. It's gone now, but - leave this in. */ - if (mach_type_specified_p && mach != arc_mach_type) - as_bad (_(".cpu conflicts with previous value")); - else - { - arc_mach_type = mach; - mach_type_specified_p = 1; - if (!bfd_set_arch_mach (stdoutput, bfd_arch_arc, mach)) - as_warn (_("could not set architecture and machine")); - } - return; - - bad_cpu: - as_bad (_("bad .cpu op")); - ignore_rest_of_line (); -} - -#if 0 -/* The .rename pseudo-op. This is used by gcc to implement - -mmangle-cpu-libgcc. */ - -static void -arc_rename (ignore) - int ignore; -{ - char *name,*new; - char c; - symbolS *sym; - int len; - - name = input_line_pointer; - c = get_symbol_end (); - sym = symbol_find_or_make (name); - *input_line_pointer = c; - - if (*input_line_pointer != ',') - { - as_bad (_("missing rename string")); - ignore_rest_of_line (); - return; - } - ++input_line_pointer; - SKIP_WHITESPACE (); - - name = input_line_pointer; - c = get_symbol_end (); - if (*name == '\0') - { - *input_line_pointer = c; - as_bad (_("invalid symbol to rename to")); - ignore_rest_of_line (); - return; - } - new = (char *) xmalloc (strlen (name) + 1); - strcpy (new, name); - *input_line_pointer = c; - symbol_get_tc (sym)->real_name = new; - - demand_empty_rest_of_line (); -} -#endif - -/* 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 prec; - LITTLENUM_TYPE words[MAX_LITTLENUMS]; - LITTLENUM_TYPE *wordP; - char *t; - char *atof_ieee (); - - switch (type) - { - case 'f': - case 'F': - prec = 2; - break; - - case 'd': - case 'D': - 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; -} - -/* 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; -{ - if (target_big_endian) - number_to_chars_bigendian (buf, val, n); - else - number_to_chars_littleendian (buf, val, n); -} - -/* Round up a section size to the appropriate boundary. */ - -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)); -} - -/* We don't have any form of relaxing. */ - -int -md_estimate_size_before_relax (fragp, seg) - fragS *fragp; - asection *seg; -{ - abort (); -} - -/* Convert a machine dependent frag. We never generate these. */ - -void -md_convert_frag (abfd, sec, fragp) - bfd *abfd; - asection *sec; - fragS *fragp; -{ - abort (); -} - -/* Parse an operand that is machine-specific. - - The ARC has a special %-op to adjust addresses so they're usable in - branches. The "st" is short for the STatus register. - ??? Later expand this to take a flags value too. - - ??? We can't create new expression types so we map the %-op's onto the - existing syntax. This means that the user could use the chosen syntax - to achieve the same effect. Perhaps put a special cookie in X_add_number - to mark the expression as special. */ - -void -md_operand (expressionP) - expressionS *expressionP; -{ - char *p = input_line_pointer; - - if (*p == '%' && strncmp (p, "%st(", 4) == 0) - { - input_line_pointer += 4; - expression (expressionP); - if (*input_line_pointer != ')') - { - as_bad (_("missing ')' in %-op")); - return; - } - ++input_line_pointer; - if (expressionP->X_op == O_symbol - && expressionP->X_add_number == 0 - /* I think this test is unnecessary but just as a sanity check... */ - && expressionP->X_op_symbol == NULL) - { - expressionS two; - - expressionP->X_op = O_right_shift; - two.X_op = O_constant; - two.X_add_symbol = two.X_op_symbol = NULL; - two.X_add_number = 2; - expressionP->X_op_symbol = make_expr_symbol (&two); - } - /* allow %st(sym1-sym2) */ - else if (expressionP->X_op == O_subtract - && expressionP->X_add_symbol != NULL - && expressionP->X_op_symbol != NULL - && expressionP->X_add_number == 0) - { - expressionS two; - - expressionP->X_add_symbol = make_expr_symbol (expressionP); - expressionP->X_op = O_right_shift; - two.X_op = O_constant; - two.X_add_symbol = two.X_op_symbol = NULL; - two.X_add_number = 2; - expressionP->X_op_symbol = make_expr_symbol (&two); - } - else - { - as_bad (_("expression too complex for %%st")); - return; - } - } -} - -/* We have no need to default values of symbols. - We could catch register names here, but that is handled by inserting - them all in the symbol table to begin with. */ - -symbolS * -md_undefined_symbol (name) - char *name; -{ - return 0; -} - -/* Functions concerning expressions. */ - -/* Parse a .byte, .word, etc. expression. - - Values for the status register are specified with %st(label). - `label' will be right shifted by 2. */ - -void -arc_parse_cons_expression (exp, nbytes) - expressionS *exp; - int nbytes; -{ - expr (0, exp); -} - -/* Record a fixup for a cons expression. */ - -void -arc_cons_fix_new (frag, where, nbytes, exp) - fragS *frag; - int where; - int nbytes; - expressionS *exp; -{ - if (nbytes == 4) - { - int reloc_type; - expressionS exptmp; - - /* This may be a special ARC reloc (eg: %st()). */ - reloc_type = get_arc_exp_reloc_type (1, BFD_RELOC_32, exp, &exptmp); - fix_new_exp (frag, where, nbytes, &exptmp, 0, reloc_type); - } - else - { - fix_new_exp (frag, where, nbytes, exp, 0, - nbytes == 2 ? BFD_RELOC_16 - : nbytes == 8 ? BFD_RELOC_64 - : BFD_RELOC_32); - } -} - -/* Functions concerning relocs. */ - -/* The location from which a PC relative jump should be calculated, - given a PC relative reloc. */ - -long -md_pcrel_from (fixP) - fixS *fixP; -{ - if (fixP->fx_addsy != (symbolS *) NULL - && ! S_IS_DEFINED (fixP->fx_addsy)) - { - /* The symbol is undefined. Let the linker figure it out. */ - return 0; - } - - /* Return the address of the delay slot. */ - return fixP->fx_frag->fr_address + fixP->fx_where + fixP->fx_size; -} - -/* Compute the reloc type of an expression. - The possibly modified expression is stored in EXPNEW. - - This is used to convert the expressions generated by the %-op's into - the appropriate operand type. It is called for both data in instructions - (operands) and data outside instructions (variables, debugging info, etc.). - - Currently supported %-ops: - - %st(symbol): represented as "symbol >> 2" - "st" is short for STatus as in the status register (pc) - - DEFAULT_TYPE is the type to use if no special processing is required. - - DATA_P is non-zero for data or limm values, zero for insn operands. - Remember that the opcode "insertion fns" cannot be used on data, they're - only for inserting operands into insns. They also can't be used for limm - values as the insertion routines don't handle limm values. When called for - insns we return fudged reloc types (real_value - BFD_RELOC_UNUSED). When - called for data or limm values we use real reloc types. */ - -static int -get_arc_exp_reloc_type (data_p, default_type, exp, expnew) - int data_p; - int default_type; - expressionS *exp; - expressionS *expnew; -{ - /* If the expression is "symbol >> 2" we must change it to just "symbol", - as fix_new_exp can't handle it. Similarily for (symbol - symbol) >> 2. - That's ok though. What's really going on here is that we're using - ">> 2" as a special syntax for specifying BFD_RELOC_ARC_B26. */ - - if (exp->X_op == O_right_shift - && exp->X_op_symbol != NULL - && symbol_constant_p (exp->X_op_symbol) - && S_GET_VALUE (exp->X_op_symbol) == 2 - && exp->X_add_number == 0) - { - if (exp->X_add_symbol != NULL - && (symbol_constant_p (exp->X_add_symbol) - || symbol_equated_p (exp->X_add_symbol))) - { - *expnew = *exp; - expnew->X_op = O_symbol; - expnew->X_op_symbol = NULL; - return data_p ? BFD_RELOC_ARC_B26 : arc_operand_map['J']; - } - else if (exp->X_add_symbol != NULL - && (symbol_get_value_expression (exp->X_add_symbol)->X_op - == O_subtract)) - { - *expnew = *symbol_get_value_expression (exp->X_add_symbol); - return data_p ? BFD_RELOC_ARC_B26 : arc_operand_map['J']; - } - } - - *expnew = *exp; - return default_type; -} - -/* Apply a fixup to the object code. This is called for all the - fixups we generated by the call to fix_new_exp, above. In the call - above we used a reloc code which was the largest legal reloc code - plus the operand index. Here we undo that to recover the operand - index. At this point all symbol values should be fully resolved, - and we attempt to completely resolve the reloc. If we can not do - that, we determine the correct reloc code and put it back in the fixup. */ - -int -md_apply_fix3 (fixP, valueP, seg) - fixS *fixP; - valueT *valueP; - segT seg; -{ - /*char *buf = fixP->fx_where + fixP->fx_frag->fr_literal;*/ - valueT value; - - /* FIXME FIXME FIXME: The value we are passed in *valueP includes - the symbol values. Since we are using BFD_ASSEMBLER, if we are - doing this relocation the code in write.c is going to call - bfd_perform_relocation, which is also going to use the symbol - value. That means that if the reloc is fully resolved we want to - use *valueP since bfd_perform_relocation is not being used. - However, if the reloc is not fully resolved we do not want to use - *valueP, and must use fx_offset instead. However, if the reloc - is PC relative, we do want to use *valueP since it includes the - result of md_pcrel_from. This is confusing. */ - - if (fixP->fx_addsy == (symbolS *) NULL) - { - value = *valueP; - fixP->fx_done = 1; - } - else if (fixP->fx_pcrel) - { - value = *valueP; - /* ELF relocations are against symbols. - If this symbol is in a different section then we need to leave it for - the linker to deal with. Unfortunately, md_pcrel_from can't tell, - so we have to undo it's effects here. */ - if (S_IS_DEFINED (fixP->fx_addsy) - && S_GET_SEGMENT (fixP->fx_addsy) != seg) - value += md_pcrel_from (fixP); - } - else - { - value = fixP->fx_offset; - if (fixP->fx_subsy != (symbolS *) NULL) - { - if (S_GET_SEGMENT (fixP->fx_subsy) == absolute_section) - value -= S_GET_VALUE (fixP->fx_subsy); - else - { - /* We can't actually support subtracting a symbol. */ - as_bad_where (fixP->fx_file, fixP->fx_line, - _("expression too complex")); - } - } - } - - if ((int) fixP->fx_r_type >= (int) BFD_RELOC_UNUSED) - { - int opindex; - const struct arc_operand *operand; - char *where; - arc_insn insn; - - opindex = (int) fixP->fx_r_type - (int) BFD_RELOC_UNUSED; - - operand = &arc_operands[opindex]; - - /* Fetch the instruction, insert the fully resolved operand - value, and stuff the instruction back again. */ - where = fixP->fx_frag->fr_literal + fixP->fx_where; - if (target_big_endian) - insn = bfd_getb32 ((unsigned char *) where); - else - insn = bfd_getl32 ((unsigned char *) where); - insn = arc_insert_operand (insn, operand, -1, NULL, (offsetT) value, - fixP->fx_file, fixP->fx_line); - if (target_big_endian) - bfd_putb32 ((bfd_vma) insn, (unsigned char *) where); - else - bfd_putl32 ((bfd_vma) insn, (unsigned char *) where); - - if (fixP->fx_done) - { - /* Nothing else to do here. */ - return 1; - } - - /* Determine a BFD reloc value based on the operand information. - We are only prepared to turn a few of the operands into relocs. - !!! Note that we can't handle limm values here. Since we're using - implicit addends the addend must be inserted into the instruction, - however, the opcode insertion routines currently do nothing with - limm values. */ - if (operand->fmt == 'B') - { - assert ((operand->flags & ARC_OPERAND_RELATIVE_BRANCH) != 0 - && operand->bits == 20 - && operand->shift == 7); - fixP->fx_r_type = BFD_RELOC_ARC_B22_PCREL; - } - else if (0 && operand->fmt == 'J') - { - assert ((operand->flags & ARC_OPERAND_ABSOLUTE_BRANCH) != 0 - && operand->bits == 24 - && operand->shift == 32); - fixP->fx_r_type = BFD_RELOC_ARC_B26; - } - else if (0 && operand->fmt == 'L') - { - assert ((operand->flags & ARC_OPERAND_LIMM) != 0 - && operand->bits == 32 - && operand->shift == 32); - fixP->fx_r_type = BFD_RELOC_32; - } - else - { - as_bad_where (fixP->fx_file, fixP->fx_line, - _("unresolved expression that must be resolved")); - fixP->fx_done = 1; - return 1; - } - } - else - { - switch (fixP->fx_r_type) - { - case BFD_RELOC_8: - md_number_to_chars (fixP->fx_frag->fr_literal + fixP->fx_where, - value, 1); - break; - case BFD_RELOC_16: - md_number_to_chars (fixP->fx_frag->fr_literal + fixP->fx_where, - value, 2); - break; - case BFD_RELOC_32: - md_number_to_chars (fixP->fx_frag->fr_literal + fixP->fx_where, - value, 4); - break; -#if 0 - case BFD_RELOC_64: - md_number_to_chars (fixP->fx_frag->fr_literal + fixP->fx_where, - value, 8); - break; -#endif - case BFD_RELOC_ARC_B26: - /* If !fixP->fx_done then `value' is an implicit addend. - We must shift it right by 2 in this case as well because the - linker performs the relocation and then adds this in (as opposed - to adding this in and then shifting right by 2). */ - value >>= 2; - md_number_to_chars (fixP->fx_frag->fr_literal + fixP->fx_where, - value, 4); - break; - default: - abort (); - } - } - - fixP->fx_addnumber = value; - - return 1; -} - -/* Translate internal representation of relocation info to BFD target - format. */ - -arelent * -tc_gen_reloc (section, fixP) - asection *section; - fixS *fixP; -{ - arelent *reloc; - - reloc = (arelent *) xmalloc (sizeof (arelent)); - - reloc->sym_ptr_ptr = (asymbol **) xmalloc (sizeof (asymbol *)); - *reloc->sym_ptr_ptr = symbol_get_bfdsym (fixP->fx_addsy); - reloc->address = fixP->fx_frag->fr_address + fixP->fx_where; - 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, - _("internal error: can't export reloc type %d (`%s')"), - fixP->fx_r_type, bfd_get_reloc_code_name (fixP->fx_r_type)); - return NULL; - } - - assert (!fixP->fx_pcrel == !reloc->howto->pc_relative); - - reloc->addend = fixP->fx_addnumber; - - return reloc; -} - -/* Frobbers. */ - -#if 0 -/* Set the real name if the .rename pseudo-op was used. - Return 1 if the symbol should not be included in the symbol table. */ - -int -arc_frob_symbol (sym) - symbolS *sym; -{ - if (symbol_get_tc (sym)->real_name != (char *) NULL) - S_SET_NAME (sym, symbol_get_tc (sym)->real_name); - - return 0; -} -#endif |