--- /dev/null
+/* DO NOT EDIT! -*- buffer-read-only: t -*- vi:set ro: */
+/* Assembler interface for targets using CGEN. -*- C -*-
+ CGEN: Cpu tools GENerator
+
+ THIS FILE IS MACHINE GENERATED WITH CGEN.
+ - the resultant file is machine generated, cgen-asm.in isn't
+
+ Copyright (C) 1996-2019 Free Software Foundation, Inc.
+
+ This file is part of libopcodes.
+
+ This library 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.
+
+ It 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 this program; if not, write to the Free Software Foundation, Inc.,
+ 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */
+
+
+/* ??? Eventually more and more of this stuff can go to cpu-independent files.
+ Keep that in mind. */
+
+#include "sysdep.h"
+#include <stdio.h>
+#include "ansidecl.h"
+#include "bfd.h"
+#include "symcat.h"
+#include "bpf-desc.h"
+#include "bpf-opc.h"
+#include "opintl.h"
+#include "xregex.h"
+#include "libiberty.h"
+#include "safe-ctype.h"
+
+#undef min
+#define min(a,b) ((a) < (b) ? (a) : (b))
+#undef max
+#define max(a,b) ((a) > (b) ? (a) : (b))
+
+static const char * parse_insn_normal
+ (CGEN_CPU_DESC, const CGEN_INSN *, const char **, CGEN_FIELDS *);
+\f
+/* -- assembler routines inserted here. */
+
+/* -- asm.c */
+
+/* Parse a signed 64-bit immediate. */
+
+static const char *
+parse_imm64 (CGEN_CPU_DESC cd,
+ const char **strp,
+ int opindex,
+ int64_t *valuep)
+{
+ bfd_vma value;
+ enum cgen_parse_operand_result result;
+ const char *errmsg;
+
+ errmsg = (* cd->parse_operand_fn)
+ (cd, CGEN_PARSE_OPERAND_INTEGER, strp, opindex, BFD_RELOC_NONE,
+ &result, &value);
+ if (!errmsg)
+ *valuep = value;
+
+ return errmsg;
+}
+
+/* Endianness size operands are integer immediates whose values can be
+ 16, 32 or 64. */
+
+static const char *
+parse_endsize (CGEN_CPU_DESC cd,
+ const char **strp,
+ int opindex,
+ unsigned long *valuep)
+{
+ const char *errmsg;
+
+ errmsg = cgen_parse_unsigned_integer (cd, strp, opindex, valuep);
+ if (errmsg)
+ return errmsg;
+
+ switch (*valuep)
+ {
+ case 16:
+ case 32:
+ case 64:
+ break;
+ default:
+ return _("expected 16, 32 or 64 in");
+ }
+
+ return NULL;
+}
+
+/* Special check to ensure that the right instruction variant is used
+ for the given endianness induced by the ISA selected in the CPU.
+ See bpf.cpu for a discussion on how eBPF is really two instruction
+ sets. */
+
+int
+bpf_cgen_insn_supported (CGEN_CPU_DESC cd, const CGEN_INSN *insn)
+{
+ CGEN_BITSET isas = CGEN_INSN_BITSET_ATTR_VALUE (insn, CGEN_INSN_ISA);
+
+ return cgen_bitset_intersect_p (&isas, cd->isas);
+}
+
+\f
+/* -- dis.c */
+
+const char * bpf_cgen_parse_operand
+ (CGEN_CPU_DESC, int, const char **, CGEN_FIELDS *);
+
+/* Main entry point for operand parsing.
+
+ This function is basically just a big switch statement. Earlier versions
+ used tables to look up the function to use, but
+ - if the table contains both assembler and disassembler functions then
+ the disassembler contains much of the assembler and vice-versa,
+ - there's a lot of inlining possibilities as things grow,
+ - using a switch statement avoids the function call overhead.
+
+ This function could be moved into `parse_insn_normal', but keeping it
+ separate makes clear the interface between `parse_insn_normal' and each of
+ the handlers. */
+
+const char *
+bpf_cgen_parse_operand (CGEN_CPU_DESC cd,
+ int opindex,
+ const char ** strp,
+ CGEN_FIELDS * fields)
+{
+ const char * errmsg = NULL;
+ /* Used by scalar operands that still need to be parsed. */
+ long junk ATTRIBUTE_UNUSED;
+
+ switch (opindex)
+ {
+ case BPF_OPERAND_DISP16 :
+ errmsg = cgen_parse_signed_integer (cd, strp, BPF_OPERAND_DISP16, (long *) (& fields->f_offset16));
+ break;
+ case BPF_OPERAND_DISP32 :
+ errmsg = cgen_parse_signed_integer (cd, strp, BPF_OPERAND_DISP32, (long *) (& fields->f_imm32));
+ break;
+ case BPF_OPERAND_DSTBE :
+ errmsg = cgen_parse_keyword (cd, strp, & bpf_cgen_opval_h_gpr, & fields->f_dstbe);
+ break;
+ case BPF_OPERAND_DSTLE :
+ errmsg = cgen_parse_keyword (cd, strp, & bpf_cgen_opval_h_gpr, & fields->f_dstle);
+ break;
+ case BPF_OPERAND_ENDSIZE :
+ errmsg = parse_endsize (cd, strp, BPF_OPERAND_ENDSIZE, (unsigned long *) (& fields->f_imm32));
+ break;
+ case BPF_OPERAND_IMM32 :
+ errmsg = cgen_parse_signed_integer (cd, strp, BPF_OPERAND_IMM32, (long *) (& fields->f_imm32));
+ break;
+ case BPF_OPERAND_IMM64 :
+ errmsg = parse_imm64 (cd, strp, BPF_OPERAND_IMM64, (int64_t *) (& fields->f_imm64));
+ break;
+ case BPF_OPERAND_OFFSET16 :
+ errmsg = cgen_parse_signed_integer (cd, strp, BPF_OPERAND_OFFSET16, (long *) (& fields->f_offset16));
+ break;
+ case BPF_OPERAND_SRCBE :
+ errmsg = cgen_parse_keyword (cd, strp, & bpf_cgen_opval_h_gpr, & fields->f_srcbe);
+ break;
+ case BPF_OPERAND_SRCLE :
+ errmsg = cgen_parse_keyword (cd, strp, & bpf_cgen_opval_h_gpr, & fields->f_srcle);
+ break;
+
+ default :
+ /* xgettext:c-format */
+ opcodes_error_handler
+ (_("internal error: unrecognized field %d while parsing"),
+ opindex);
+ abort ();
+ }
+
+ return errmsg;
+}
+
+cgen_parse_fn * const bpf_cgen_parse_handlers[] =
+{
+ parse_insn_normal,
+};
+
+void
+bpf_cgen_init_asm (CGEN_CPU_DESC cd)
+{
+ bpf_cgen_init_opcode_table (cd);
+ bpf_cgen_init_ibld_table (cd);
+ cd->parse_handlers = & bpf_cgen_parse_handlers[0];
+ cd->parse_operand = bpf_cgen_parse_operand;
+#ifdef CGEN_ASM_INIT_HOOK
+CGEN_ASM_INIT_HOOK
+#endif
+}
+
+\f
+
+/* Regex construction routine.
+
+ This translates an opcode syntax string into a regex string,
+ by replacing any non-character syntax element (such as an
+ opcode) with the pattern '.*'
+
+ It then compiles the regex and stores it in the opcode, for
+ later use by bpf_cgen_assemble_insn
+
+ Returns NULL for success, an error message for failure. */
+
+char *
+bpf_cgen_build_insn_regex (CGEN_INSN *insn)
+{
+ CGEN_OPCODE *opc = (CGEN_OPCODE *) CGEN_INSN_OPCODE (insn);
+ const char *mnem = CGEN_INSN_MNEMONIC (insn);
+ char rxbuf[CGEN_MAX_RX_ELEMENTS];
+ char *rx = rxbuf;
+ const CGEN_SYNTAX_CHAR_TYPE *syn;
+ int reg_err;
+
+ syn = CGEN_SYNTAX_STRING (CGEN_OPCODE_SYNTAX (opc));
+
+ /* Mnemonics come first in the syntax string. */
+ if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
+ return _("missing mnemonic in syntax string");
+ ++syn;
+
+ /* Generate a case sensitive regular expression that emulates case
+ insensitive matching in the "C" locale. We cannot generate a case
+ insensitive regular expression because in Turkish locales, 'i' and 'I'
+ are not equal modulo case conversion. */
+
+ /* Copy the literal mnemonic out of the insn. */
+ for (; *mnem; mnem++)
+ {
+ char c = *mnem;
+
+ if (ISALPHA (c))
+ {
+ *rx++ = '[';
+ *rx++ = TOLOWER (c);
+ *rx++ = TOUPPER (c);
+ *rx++ = ']';
+ }
+ else
+ *rx++ = c;
+ }
+
+ /* Copy any remaining literals from the syntax string into the rx. */
+ for(; * syn != 0 && rx <= rxbuf + (CGEN_MAX_RX_ELEMENTS - 7 - 4); ++syn)
+ {
+ if (CGEN_SYNTAX_CHAR_P (* syn))
+ {
+ char c = CGEN_SYNTAX_CHAR (* syn);
+
+ switch (c)
+ {
+ /* Escape any regex metacharacters in the syntax. */
+ case '.': case '[': case '\\':
+ case '*': case '^': case '$':
+
+#ifdef CGEN_ESCAPE_EXTENDED_REGEX
+ case '?': case '{': case '}':
+ case '(': case ')': case '*':
+ case '|': case '+': case ']':
+#endif
+ *rx++ = '\\';
+ *rx++ = c;
+ break;
+
+ default:
+ if (ISALPHA (c))
+ {
+ *rx++ = '[';
+ *rx++ = TOLOWER (c);
+ *rx++ = TOUPPER (c);
+ *rx++ = ']';
+ }
+ else
+ *rx++ = c;
+ break;
+ }
+ }
+ else
+ {
+ /* Replace non-syntax fields with globs. */
+ *rx++ = '.';
+ *rx++ = '*';
+ }
+ }
+
+ /* Trailing whitespace ok. */
+ * rx++ = '[';
+ * rx++ = ' ';
+ * rx++ = '\t';
+ * rx++ = ']';
+ * rx++ = '*';
+
+ /* But anchor it after that. */
+ * rx++ = '$';
+ * rx = '\0';
+
+ CGEN_INSN_RX (insn) = xmalloc (sizeof (regex_t));
+ reg_err = regcomp ((regex_t *) CGEN_INSN_RX (insn), rxbuf, REG_NOSUB);
+
+ if (reg_err == 0)
+ return NULL;
+ else
+ {
+ static char msg[80];
+
+ regerror (reg_err, (regex_t *) CGEN_INSN_RX (insn), msg, 80);
+ regfree ((regex_t *) CGEN_INSN_RX (insn));
+ free (CGEN_INSN_RX (insn));
+ (CGEN_INSN_RX (insn)) = NULL;
+ return msg;
+ }
+}
+
+\f
+/* Default insn parser.
+
+ The syntax string is scanned and operands are parsed and stored in FIELDS.
+ Relocs are queued as we go via other callbacks.
+
+ ??? Note that this is currently an all-or-nothing parser. If we fail to
+ parse the instruction, we return 0 and the caller will start over from
+ the beginning. Backtracking will be necessary in parsing subexpressions,
+ but that can be handled there. Not handling backtracking here may get
+ expensive in the case of the m68k. Deal with later.
+
+ Returns NULL for success, an error message for failure. */
+
+static const char *
+parse_insn_normal (CGEN_CPU_DESC cd,
+ const CGEN_INSN *insn,
+ const char **strp,
+ CGEN_FIELDS *fields)
+{
+ /* ??? Runtime added insns not handled yet. */
+ const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);
+ const char *str = *strp;
+ const char *errmsg;
+ const char *p;
+ const CGEN_SYNTAX_CHAR_TYPE * syn;
+#ifdef CGEN_MNEMONIC_OPERANDS
+ /* FIXME: wip */
+ int past_opcode_p;
+#endif
+
+ /* For now we assume the mnemonic is first (there are no leading operands).
+ We can parse it without needing to set up operand parsing.
+ GAS's input scrubber will ensure mnemonics are lowercase, but we may
+ not be called from GAS. */
+ p = CGEN_INSN_MNEMONIC (insn);
+ while (*p && TOLOWER (*p) == TOLOWER (*str))
+ ++p, ++str;
+
+ if (* p)
+ return _("unrecognized instruction");
+
+#ifndef CGEN_MNEMONIC_OPERANDS
+ if (* str && ! ISSPACE (* str))
+ return _("unrecognized instruction");
+#endif
+
+ CGEN_INIT_PARSE (cd);
+ cgen_init_parse_operand (cd);
+#ifdef CGEN_MNEMONIC_OPERANDS
+ past_opcode_p = 0;
+#endif
+
+ /* We don't check for (*str != '\0') here because we want to parse
+ any trailing fake arguments in the syntax string. */
+ syn = CGEN_SYNTAX_STRING (syntax);
+
+ /* Mnemonics come first for now, ensure valid string. */
+ if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
+ abort ();
+
+ ++syn;
+
+ while (* syn != 0)
+ {
+ /* Non operand chars must match exactly. */
+ if (CGEN_SYNTAX_CHAR_P (* syn))
+ {
+ /* FIXME: While we allow for non-GAS callers above, we assume the
+ first char after the mnemonic part is a space. */
+ /* FIXME: We also take inappropriate advantage of the fact that
+ GAS's input scrubber will remove extraneous blanks. */
+ if (TOLOWER (*str) == TOLOWER (CGEN_SYNTAX_CHAR (* syn)))
+ {
+#ifdef CGEN_MNEMONIC_OPERANDS
+ if (CGEN_SYNTAX_CHAR(* syn) == ' ')
+ past_opcode_p = 1;
+#endif
+ ++ syn;
+ ++ str;
+ }
+ else if (*str)
+ {
+ /* Syntax char didn't match. Can't be this insn. */
+ static char msg [80];
+
+ /* xgettext:c-format */
+ sprintf (msg, _("syntax error (expected char `%c', found `%c')"),
+ CGEN_SYNTAX_CHAR(*syn), *str);
+ return msg;
+ }
+ else
+ {
+ /* Ran out of input. */
+ static char msg [80];
+
+ /* xgettext:c-format */
+ sprintf (msg, _("syntax error (expected char `%c', found end of instruction)"),
+ CGEN_SYNTAX_CHAR(*syn));
+ return msg;
+ }
+ continue;
+ }
+
+#ifdef CGEN_MNEMONIC_OPERANDS
+ (void) past_opcode_p;
+#endif
+ /* We have an operand of some sort. */
+ errmsg = cd->parse_operand (cd, CGEN_SYNTAX_FIELD (*syn), &str, fields);
+ if (errmsg)
+ return errmsg;
+
+ /* Done with this operand, continue with next one. */
+ ++ syn;
+ }
+
+ /* If we're at the end of the syntax string, we're done. */
+ if (* syn == 0)
+ {
+ /* FIXME: 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')
+ return _("junk at end of line"); /* FIXME: would like to include `str' */
+
+ return NULL;
+ }
+
+ /* We couldn't parse it. */
+ return _("unrecognized instruction");
+}
+\f
+/* Main entry point.
+ This routine is called for each instruction to be assembled.
+ STR points to the insn to be assembled.
+ We assume all necessary tables have been initialized.
+ The assembled instruction, less any fixups, is stored in BUF.
+ Remember that if CGEN_INT_INSN_P then BUF is an int and thus the value
+ still needs to be converted to target byte order, otherwise BUF is an array
+ of bytes in target byte order.
+ The result is a pointer to the insn's entry in the opcode table,
+ or NULL if an error occured (an error message will have already been
+ printed).
+
+ Note that when processing (non-alias) macro-insns,
+ this function recurses.
+
+ ??? It's possible to make this cpu-independent.
+ One would have to deal with a few minor things.
+ At this point in time doing so would be more of a curiosity than useful
+ [for example this file isn't _that_ big], but keeping the possibility in
+ mind helps keep the design clean. */
+
+const CGEN_INSN *
+bpf_cgen_assemble_insn (CGEN_CPU_DESC cd,
+ const char *str,
+ CGEN_FIELDS *fields,
+ CGEN_INSN_BYTES_PTR buf,
+ char **errmsg)
+{
+ const char *start;
+ CGEN_INSN_LIST *ilist;
+ const char *parse_errmsg = NULL;
+ const char *insert_errmsg = NULL;
+ int recognized_mnemonic = 0;
+
+ /* Skip leading white space. */
+ while (ISSPACE (* str))
+ ++ str;
+
+ /* The instructions are stored in hashed lists.
+ Get the first in the list. */
+ ilist = CGEN_ASM_LOOKUP_INSN (cd, str);
+
+ /* Keep looking until we find a match. */
+ start = str;
+ for ( ; ilist != NULL ; ilist = CGEN_ASM_NEXT_INSN (ilist))
+ {
+ const CGEN_INSN *insn = ilist->insn;
+ recognized_mnemonic = 1;
+
+#ifdef CGEN_VALIDATE_INSN_SUPPORTED
+ /* Not usually needed as unsupported opcodes
+ shouldn't be in the hash lists. */
+ /* Is this insn supported by the selected cpu? */
+ if (! bpf_cgen_insn_supported (cd, insn))
+ continue;
+#endif
+ /* If the RELAXED attribute is set, this is an insn that shouldn't be
+ chosen immediately. Instead, it is used during assembler/linker
+ relaxation if possible. */
+ if (CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAXED) != 0)
+ continue;
+
+ str = start;
+
+ /* Skip this insn if str doesn't look right lexically. */
+ if (CGEN_INSN_RX (insn) != NULL &&
+ regexec ((regex_t *) CGEN_INSN_RX (insn), str, 0, NULL, 0) == REG_NOMATCH)
+ continue;
+
+ /* Allow parse/insert handlers to obtain length of insn. */
+ CGEN_FIELDS_BITSIZE (fields) = CGEN_INSN_BITSIZE (insn);
+
+ parse_errmsg = CGEN_PARSE_FN (cd, insn) (cd, insn, & str, fields);
+ if (parse_errmsg != NULL)
+ continue;
+
+ /* ??? 0 is passed for `pc'. */
+ insert_errmsg = CGEN_INSERT_FN (cd, insn) (cd, insn, fields, buf,
+ (bfd_vma) 0);
+ if (insert_errmsg != NULL)
+ continue;
+
+ /* It is up to the caller to actually output the insn and any
+ queued relocs. */
+ return insn;
+ }
+
+ {
+ static char errbuf[150];
+ const char *tmp_errmsg;
+#ifdef CGEN_VERBOSE_ASSEMBLER_ERRORS
+#define be_verbose 1
+#else
+#define be_verbose 0
+#endif
+
+ if (be_verbose)
+ {
+ /* If requesting verbose error messages, use insert_errmsg.
+ Failing that, use parse_errmsg. */
+ tmp_errmsg = (insert_errmsg ? insert_errmsg :
+ parse_errmsg ? parse_errmsg :
+ recognized_mnemonic ?
+ _("unrecognized form of instruction") :
+ _("unrecognized instruction"));
+
+ if (strlen (start) > 50)
+ /* xgettext:c-format */
+ sprintf (errbuf, "%s `%.50s...'", tmp_errmsg, start);
+ else
+ /* xgettext:c-format */
+ sprintf (errbuf, "%s `%.50s'", tmp_errmsg, start);
+ }
+ else
+ {
+ if (strlen (start) > 50)
+ /* xgettext:c-format */
+ sprintf (errbuf, _("bad instruction `%.50s...'"), start);
+ else
+ /* xgettext:c-format */
+ sprintf (errbuf, _("bad instruction `%.50s'"), start);
+ }
+
+ *errmsg = errbuf;
+ return NULL;
+ }
+}
projects / thirdparty / binutils-gdb.git / blobdiff