495 lines
11 KiB
C
495 lines
11 KiB
C
/* tc-pj.c -- Assemble code for Pico Java
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Copyright (C) 1999-2015 Free Software Foundation, Inc.
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This file is part of GAS, the GNU Assembler.
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GAS is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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GAS is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GAS; see the file COPYING. If not, write to
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the Free Software Foundation, 51 Franklin Street - Fifth Floor,
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Boston, MA 02110-1301, USA. */
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/* Contributed by Steve Chamberlain of Transmeta <sac@pobox.com>. */
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#include "as.h"
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#include "safe-ctype.h"
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#include "opcode/pj.h"
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extern const pj_opc_info_t pj_opc_info[512];
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const char comment_chars[] = "!/";
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const char line_separator_chars[] = ";";
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const char line_comment_chars[] = "/!#";
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static int pending_reloc;
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static struct hash_control *opcode_hash_control;
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static void
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little (int ignore ATTRIBUTE_UNUSED)
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{
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target_big_endian = 0;
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}
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static void
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big (int ignore ATTRIBUTE_UNUSED)
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{
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target_big_endian = 1;
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}
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const pseudo_typeS md_pseudo_table[] =
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{
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{"ml", little, 0},
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{"mb", big, 0},
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{0, 0, 0}
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};
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const char FLT_CHARS[] = "rRsSfFdDxXpP";
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const char EXP_CHARS[] = "eE";
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void
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md_operand (expressionS *op)
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{
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if (strncmp (input_line_pointer, "%hi16", 5) == 0)
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{
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if (pending_reloc)
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as_bad (_("confusing relocation expressions"));
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pending_reloc = BFD_RELOC_PJ_CODE_HI16;
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input_line_pointer += 5;
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expression (op);
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}
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if (strncmp (input_line_pointer, "%lo16", 5) == 0)
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{
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if (pending_reloc)
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as_bad (_("confusing relocation expressions"));
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pending_reloc = BFD_RELOC_PJ_CODE_LO16;
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input_line_pointer += 5;
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expression (op);
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}
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}
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/* Parse an expression and then restore the input line pointer. */
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static char *
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parse_exp_save_ilp (char *s, expressionS *op)
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{
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char *save = input_line_pointer;
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input_line_pointer = s;
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expression (op);
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s = input_line_pointer;
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input_line_pointer = save;
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return s;
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}
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/* This is called by emit_expr via TC_CONS_FIX_NEW when creating a
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reloc for a cons. We could use the definition there, except that
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we want to handle magic pending reloc expressions specially. */
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void
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pj_cons_fix_new_pj (fragS *frag, int where, int nbytes, expressionS *exp,
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bfd_reloc_code_real_type r ATTRIBUTE_UNUSED)
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{
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static int rv[5][2] =
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{ { 0, 0 },
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{ BFD_RELOC_8, BFD_RELOC_8 },
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{ BFD_RELOC_PJ_CODE_DIR16, BFD_RELOC_16 },
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{ 0, 0 },
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{ BFD_RELOC_PJ_CODE_DIR32, BFD_RELOC_32 }};
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fix_new_exp (frag, where, nbytes, exp, 0,
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pending_reloc ? pending_reloc
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: rv[nbytes][(now_seg->flags & SEC_CODE) ? 0 : 1]);
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pending_reloc = 0;
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}
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/* Turn a reloc description character from the pj-opc.h table into
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code which BFD can handle. */
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static int
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c_to_r (int x)
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{
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switch (x)
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{
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case O_R8:
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return BFD_RELOC_8_PCREL;
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case O_U8:
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case O_8:
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return BFD_RELOC_8;
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case O_R16:
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return BFD_RELOC_PJ_CODE_REL16;
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case O_U16:
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case O_16:
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return BFD_RELOC_PJ_CODE_DIR16;
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case O_R32:
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return BFD_RELOC_PJ_CODE_REL32;
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case O_32:
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return BFD_RELOC_PJ_CODE_DIR32;
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}
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abort ();
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return 0;
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}
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/* Handler for the ipush fake opcode,
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turns ipush <foo> into sipush lo16<foo>, sethi hi16<foo>. */
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static void
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ipush_code (pj_opc_info_t *opcode ATTRIBUTE_UNUSED, char *str)
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{
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char *b = frag_more (6);
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expressionS arg;
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b[0] = 0x11;
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b[3] = 0xed;
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parse_exp_save_ilp (str + 1, &arg);
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if (pending_reloc)
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{
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as_bad (_("can't have relocation for ipush"));
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pending_reloc = 0;
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}
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fix_new_exp (frag_now, b - frag_now->fr_literal + 1, 2,
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&arg, 0, BFD_RELOC_PJ_CODE_DIR16);
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fix_new_exp (frag_now, b - frag_now->fr_literal + 4, 2,
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&arg, 0, BFD_RELOC_PJ_CODE_HI16);
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}
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/* Insert names into the opcode table which are really mini macros,
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not opcodes. The fakeness is indicated with an opcode of -1. */
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static void
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fake_opcode (const char *name,
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void (*func) (struct pj_opc_info_t *, char *))
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{
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pj_opc_info_t * fake = xmalloc (sizeof (pj_opc_info_t));
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fake->opcode = -1;
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fake->opcode_next = -1;
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fake->u.func = func;
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hash_insert (opcode_hash_control, name, (char *) fake);
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}
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/* Enter another entry into the opcode hash table so the same opcode
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can have another name. */
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static void
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alias (const char *new_name, const char *old)
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{
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hash_insert (opcode_hash_control, new_name,
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(char *) hash_find (opcode_hash_control, old));
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}
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/* This function is called once, at assembler startup time. It sets
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up the hash table with all the opcodes in it, and also initializes
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some aliases for compatibility with other assemblers. */
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void
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md_begin (void)
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{
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const pj_opc_info_t *opcode;
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opcode_hash_control = hash_new ();
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/* Insert names into hash table. */
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for (opcode = pj_opc_info; opcode->u.name; opcode++)
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hash_insert (opcode_hash_control, opcode->u.name, (char *) opcode);
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/* Insert the only fake opcode. */
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fake_opcode ("ipush", ipush_code);
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/* Add some aliases for opcode names. */
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alias ("ifeq_s", "ifeq");
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alias ("ifne_s", "ifne");
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alias ("if_icmpge_s", "if_icmpge");
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alias ("if_icmpne_s", "if_icmpne");
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alias ("if_icmpeq_s", "if_icmpeq");
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alias ("if_icmpgt_s", "if_icmpgt");
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alias ("goto_s", "goto");
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bfd_set_arch_mach (stdoutput, TARGET_ARCH, 0);
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}
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/* This is the guts of the machine-dependent assembler. STR points to
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a machine dependent instruction. This function is supposed to emit
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the frags/bytes it assembles to. */
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void
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md_assemble (char *str)
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{
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char *op_start;
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char *op_end;
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pj_opc_info_t *opcode;
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char *output;
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int idx = 0;
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char pend;
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int nlen = 0;
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/* Drop leading whitespace. */
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while (*str == ' ')
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str++;
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/* Find the op code end. */
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op_start = str;
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for (op_end = str;
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*op_end && !is_end_of_line[*op_end & 0xff] && *op_end != ' ';
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op_end++)
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nlen++;
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pend = *op_end;
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*op_end = 0;
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if (nlen == 0)
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as_bad (_("can't find opcode "));
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opcode = (pj_opc_info_t *) hash_find (opcode_hash_control, op_start);
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*op_end = pend;
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if (opcode == NULL)
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{
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as_bad (_("unknown opcode %s"), op_start);
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return;
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}
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dwarf2_emit_insn (0);
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if (opcode->opcode == -1)
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{
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/* It's a fake opcode. Dig out the args and pretend that was
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what we were passed. */
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(*opcode->u.func) (opcode, op_end);
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}
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else
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{
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int an;
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output = frag_more (opcode->len);
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output[idx++] = opcode->opcode;
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if (opcode->opcode_next != -1)
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output[idx++] = opcode->opcode_next;
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for (an = 0; opcode->arg[an]; an++)
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{
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expressionS arg;
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if (*op_end == ',' && an != 0)
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op_end++;
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if (*op_end == 0)
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as_bad (_("expected expression"));
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op_end = parse_exp_save_ilp (op_end, &arg);
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fix_new_exp (frag_now,
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output - frag_now->fr_literal + idx,
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ASIZE (opcode->arg[an]),
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&arg,
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PCREL (opcode->arg[an]),
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pending_reloc ? pending_reloc : c_to_r (opcode->arg[an]));
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idx += ASIZE (opcode->arg[an]);
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pending_reloc = 0;
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}
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while (ISSPACE (*op_end))
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op_end++;
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if (*op_end != 0)
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as_warn (_("extra stuff on line ignored"));
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}
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if (pending_reloc)
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as_bad (_("Something forgot to clean up\n"));
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}
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char *
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md_atof (int type, char *litP, int *sizeP)
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{
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return ieee_md_atof (type, litP, sizeP, target_big_endian);
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}
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const char *md_shortopts = "";
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struct option md_longopts[] =
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{
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#define OPTION_LITTLE (OPTION_MD_BASE)
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#define OPTION_BIG (OPTION_LITTLE + 1)
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{"little", no_argument, NULL, OPTION_LITTLE},
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{"big", no_argument, NULL, OPTION_BIG},
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{NULL, no_argument, NULL, 0}
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};
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size_t md_longopts_size = sizeof (md_longopts);
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int
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md_parse_option (int c, char *arg ATTRIBUTE_UNUSED)
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{
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switch (c)
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{
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case OPTION_LITTLE:
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little (0);
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break;
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case OPTION_BIG:
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big (0);
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break;
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default:
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return 0;
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}
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return 1;
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}
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void
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md_show_usage (FILE *stream)
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{
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fprintf (stream, _("\
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PJ options:\n\
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-little generate little endian code\n\
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-big generate big endian code\n"));
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}
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/* Apply a fixup to the object file. */
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void
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md_apply_fix (fixS *fixP, valueT * valP, segT seg ATTRIBUTE_UNUSED)
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{
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char *buf = fixP->fx_where + fixP->fx_frag->fr_literal;
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long val = *valP;
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long max, min;
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max = min = 0;
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switch (fixP->fx_r_type)
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{
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case BFD_RELOC_VTABLE_INHERIT:
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case BFD_RELOC_VTABLE_ENTRY:
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fixP->fx_done = 0;
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return;
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case BFD_RELOC_PJ_CODE_REL16:
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if (val < -0x8000 || val >= 0x7fff)
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as_bad_where (fixP->fx_file, fixP->fx_line, _("pcrel too far"));
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buf[0] |= (val >> 8) & 0xff;
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buf[1] = val & 0xff;
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break;
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case BFD_RELOC_PJ_CODE_HI16:
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*buf++ = val >> 24;
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*buf++ = val >> 16;
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fixP->fx_addnumber = val & 0xffff;
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break;
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case BFD_RELOC_PJ_CODE_DIR16:
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case BFD_RELOC_PJ_CODE_LO16:
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*buf++ = val >> 8;
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*buf++ = val >> 0;
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max = 0xffff;
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min = -0xffff;
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break;
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case BFD_RELOC_8:
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max = 0xff;
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min = -0xff;
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*buf++ = val;
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break;
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case BFD_RELOC_PJ_CODE_DIR32:
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*buf++ = val >> 24;
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*buf++ = val >> 16;
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*buf++ = val >> 8;
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*buf++ = val >> 0;
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break;
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case BFD_RELOC_32:
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if (target_big_endian)
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{
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*buf++ = val >> 24;
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*buf++ = val >> 16;
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*buf++ = val >> 8;
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*buf++ = val >> 0;
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}
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else
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{
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*buf++ = val >> 0;
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*buf++ = val >> 8;
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*buf++ = val >> 16;
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*buf++ = val >> 24;
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}
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break;
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case BFD_RELOC_16:
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if (target_big_endian)
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{
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*buf++ = val >> 8;
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*buf++ = val >> 0;
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}
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else
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{
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*buf++ = val >> 0;
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*buf++ = val >> 8;
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}
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break;
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default:
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abort ();
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}
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if (max != 0 && (val < min || val > max))
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as_bad_where (fixP->fx_file, fixP->fx_line, _("offset out of range"));
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if (fixP->fx_addsy == NULL && fixP->fx_pcrel == 0)
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fixP->fx_done = 1;
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}
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/* Put number into target byte order. Always put values in an
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executable section into big endian order. */
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void
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md_number_to_chars (char *ptr, valueT use, int nbytes)
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{
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if (target_big_endian || now_seg->flags & SEC_CODE)
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number_to_chars_bigendian (ptr, use, nbytes);
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else
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number_to_chars_littleendian (ptr, use, nbytes);
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}
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/* Translate internal representation of relocation info to BFD target
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format. */
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arelent *
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tc_gen_reloc (asection *section ATTRIBUTE_UNUSED, fixS *fixp)
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{
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arelent *rel;
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bfd_reloc_code_real_type r_type;
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rel = xmalloc (sizeof (arelent));
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rel->sym_ptr_ptr = xmalloc (sizeof (asymbol *));
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*rel->sym_ptr_ptr = symbol_get_bfdsym (fixp->fx_addsy);
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rel->address = fixp->fx_frag->fr_address + fixp->fx_where;
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r_type = fixp->fx_r_type;
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rel->addend = fixp->fx_addnumber;
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rel->howto = bfd_reloc_type_lookup (stdoutput, r_type);
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if (rel->howto == NULL)
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{
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as_bad_where (fixp->fx_file, fixp->fx_line,
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_("Cannot represent relocation type %s"),
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bfd_get_reloc_code_name (r_type));
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/* Set howto to a garbage value so that we can keep going. */
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rel->howto = bfd_reloc_type_lookup (stdoutput, BFD_RELOC_32);
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gas_assert (rel->howto != NULL);
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}
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return rel;
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}
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