1274 lines
35 KiB
C
1274 lines
35 KiB
C
/* tc-m32c.c -- Assembler for the Renesas M32C.
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Copyright (C) 2005-2022 Free Software Foundation, Inc.
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Contributed by RedHat.
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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 this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
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MA 02110-1301, USA. */
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#include "as.h"
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#include "subsegs.h"
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#include "symcat.h"
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#include "opcodes/m32c-desc.h"
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#include "opcodes/m32c-opc.h"
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#include "cgen.h"
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#include "elf/common.h"
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#include "elf/m32c.h"
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#include "safe-ctype.h"
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/* Structure to hold all of the different components
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describing an individual instruction. */
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typedef struct
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{
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const CGEN_INSN * insn;
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const CGEN_INSN * orig_insn;
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CGEN_FIELDS fields;
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#if CGEN_INT_INSN_P
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CGEN_INSN_INT buffer [1];
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#define INSN_VALUE(buf) (*(buf))
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#else
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unsigned char buffer [CGEN_MAX_INSN_SIZE];
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#define INSN_VALUE(buf) (buf)
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#endif
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char * addr;
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fragS * frag;
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int num_fixups;
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fixS * fixups [GAS_CGEN_MAX_FIXUPS];
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int indices [MAX_OPERAND_INSTANCES];
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}
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m32c_insn;
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#define rl_for(_insn) (CGEN_ATTR_CGEN_INSN_RL_TYPE_VALUE (&((_insn).insn->base->attrs)))
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#define relaxable(_insn) (CGEN_ATTR_CGEN_INSN_RELAXABLE_VALUE (&((_insn).insn->base->attrs)))
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const char comment_chars[] = ";";
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const char line_comment_chars[] = "#";
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const char line_separator_chars[] = "|";
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const char EXP_CHARS[] = "eE";
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const char FLT_CHARS[] = "dD";
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#define M32C_SHORTOPTS ""
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const char * md_shortopts = M32C_SHORTOPTS;
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/* assembler options */
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#define OPTION_CPU_M16C (OPTION_MD_BASE)
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#define OPTION_CPU_M32C (OPTION_MD_BASE + 1)
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#define OPTION_LINKRELAX (OPTION_MD_BASE + 2)
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#define OPTION_H_TICK_HEX (OPTION_MD_BASE + 3)
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struct option md_longopts[] =
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{
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{ "m16c", no_argument, NULL, OPTION_CPU_M16C },
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{ "m32c", no_argument, NULL, OPTION_CPU_M32C },
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{ "relax", no_argument, NULL, OPTION_LINKRELAX },
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{ "h-tick-hex", no_argument, NULL, OPTION_H_TICK_HEX },
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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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/* Default machine */
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#define DEFAULT_MACHINE bfd_mach_m16c
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#define DEFAULT_FLAGS EF_M32C_CPU_M16C
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static unsigned long m32c_mach = bfd_mach_m16c;
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static int cpu_mach = (1 << MACH_M16C);
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static int m32c_relax = 0;
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/* Flags to set in the elf header */
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static flagword m32c_flags = DEFAULT_FLAGS;
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static char default_isa = 1 << (7 - ISA_M16C);
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static CGEN_BITSET m32c_isa = {1, & default_isa};
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static void
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set_isa (enum isa_attr isa_num)
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{
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cgen_bitset_set (& m32c_isa, isa_num);
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}
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static void s_bss (int);
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int
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md_parse_option (int c, const char * arg ATTRIBUTE_UNUSED)
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{
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switch (c)
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{
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case OPTION_CPU_M16C:
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m32c_flags = (m32c_flags & ~EF_M32C_CPU_MASK) | EF_M32C_CPU_M16C;
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m32c_mach = bfd_mach_m16c;
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cpu_mach = (1 << MACH_M16C);
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set_isa (ISA_M16C);
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break;
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case OPTION_CPU_M32C:
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m32c_flags = (m32c_flags & ~EF_M32C_CPU_MASK) | EF_M32C_CPU_M32C;
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m32c_mach = bfd_mach_m32c;
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cpu_mach = (1 << MACH_M32C);
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set_isa (ISA_M32C);
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break;
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case OPTION_LINKRELAX:
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m32c_relax = 1;
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break;
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case OPTION_H_TICK_HEX:
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enable_h_tick_hex = 1;
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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, _(" M32C specific command line options:\n"));
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}
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static void
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s_bss (int ignore ATTRIBUTE_UNUSED)
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{
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int temp;
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temp = get_absolute_expression ();
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subseg_set (bss_section, (subsegT) temp);
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demand_empty_rest_of_line ();
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}
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/* The target specific pseudo-ops which we support. */
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const pseudo_typeS md_pseudo_table[] =
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{
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{ "bss", s_bss, 0},
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{ "3byte", cons, 3 },
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{ "word", cons, 4 },
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{ NULL, NULL, 0 }
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};
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void
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md_begin (void)
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{
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/* Initialize the `cgen' interface. */
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/* Set the machine number and endian. */
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gas_cgen_cpu_desc = m32c_cgen_cpu_open (CGEN_CPU_OPEN_MACHS, cpu_mach,
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CGEN_CPU_OPEN_ENDIAN,
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CGEN_ENDIAN_BIG,
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CGEN_CPU_OPEN_ISAS, & m32c_isa,
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CGEN_CPU_OPEN_END);
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m32c_cgen_init_asm (gas_cgen_cpu_desc);
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/* This is a callback from cgen to gas to parse operands. */
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cgen_set_parse_operand_fn (gas_cgen_cpu_desc, gas_cgen_parse_operand);
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/* Set the ELF flags if desired. */
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if (m32c_flags)
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bfd_set_private_flags (stdoutput, m32c_flags);
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/* Set the machine type */
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bfd_default_set_arch_mach (stdoutput, bfd_arch_m32c, m32c_mach);
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}
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void
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m32c_start_line_hook (void)
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{
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#if 0 /* not necessary....handled in the .cpu file */
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char *s = input_line_pointer;
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char *sg;
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for (s = input_line_pointer ; s && s[0] != '\n'; s++)
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{
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if (s[0] == ':')
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{
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/* Remove :g suffix. Squeeze out blanks. */
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if (s[1] == 'g')
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{
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for (sg = s - 1; sg && sg >= input_line_pointer; sg--)
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{
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sg[2] = sg[0];
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}
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sg[1] = ' ';
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sg[2] = ' ';
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input_line_pointer += 2;
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}
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}
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}
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#endif
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}
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/* Process [[indirect-operands]] in instruction str. */
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static bool
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m32c_indirect_operand (char *str)
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{
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char *new_str;
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char *s;
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char *ns;
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int ns_len;
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char *ns_end;
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enum indirect_type {none, relative, absolute} ;
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enum indirect_type indirection [3] = { none, none, none };
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int brace_n [3] = { 0, 0, 0 };
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int operand;
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s = str;
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operand = 1;
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for (s = str; *s; s++)
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{
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if (s[0] == ',')
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operand = 2;
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/* [abs] where abs is not a0 or a1 */
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if (s[1] == '[' && ! (s[2] == 'a' && (s[3] == '0' || s[3] == '1'))
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&& (ISBLANK (s[0]) || s[0] == ','))
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indirection[operand] = absolute;
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if (s[0] == ']' && s[1] == ']')
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indirection[operand] = relative;
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if (s[0] == '[' && s[1] == '[')
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indirection[operand] = relative;
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}
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if (indirection[1] == none && indirection[2] == none)
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return false;
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operand = 1;
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ns_len = strlen (str);
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new_str = XNEWVEC (char, ns_len);
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ns = new_str;
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ns_end = ns + ns_len;
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for (s = str; *s; s++)
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{
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if (s[0] == ',')
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operand = 2;
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if (s[0] == '[' && ! brace_n[operand])
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{
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brace_n[operand] += 1;
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/* Squeeze [[ to [ if this is an indirect operand. */
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if (indirection[operand] != none)
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continue;
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}
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else if (s[0] == '[' && brace_n[operand])
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{
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brace_n[operand] += 1;
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}
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else if (s[0] == ']' && s[1] == ']' && indirection[operand] == relative)
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{
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s += 1; /* skip one ]. */
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brace_n[operand] -= 2; /* allow for 2 [. */
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}
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else if (s[0] == ']' && indirection[operand] == absolute)
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{
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brace_n[operand] -= 1;
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continue; /* skip closing ]. */
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}
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else if (s[0] == ']')
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{
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brace_n[operand] -= 1;
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}
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*ns = s[0];
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ns += 1;
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if (ns >= ns_end)
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return false;
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if (s[0] == 0)
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break;
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}
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*ns = '\0';
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for (operand = 1; operand <= 2; operand++)
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if (brace_n[operand])
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{
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fprintf (stderr, "Unmatched [[operand-%d]] %d\n", operand, brace_n[operand]);
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}
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if (indirection[1] != none && indirection[2] != none)
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md_assemble ((char *) "src-dest-indirect");
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else if (indirection[1] != none)
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md_assemble ((char *) "src-indirect");
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else if (indirection[2] != none)
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md_assemble ((char *) "dest-indirect");
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md_assemble (new_str);
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free (new_str);
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return true;
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}
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void
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md_assemble (char * str)
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{
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static int last_insn_had_delay_slot = 0;
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m32c_insn insn;
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char * errmsg;
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finished_insnS results;
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int rl_type;
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int insn_size;
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if (m32c_mach == bfd_mach_m32c && m32c_indirect_operand (str))
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return;
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/* Initialize GAS's cgen interface for a new instruction. */
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gas_cgen_init_parse ();
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insn.insn = m32c_cgen_assemble_insn
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(gas_cgen_cpu_desc, str, & insn.fields, insn.buffer, & errmsg);
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if (!insn.insn)
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{
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as_bad ("%s", errmsg);
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return;
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}
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results.num_fixups = 0;
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/* Doesn't really matter what we pass for RELAX_P here. */
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gas_cgen_finish_insn (insn.insn, insn.buffer,
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CGEN_FIELDS_BITSIZE (& insn.fields), 1, &results);
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last_insn_had_delay_slot
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= CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_DELAY_SLOT);
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(void) last_insn_had_delay_slot;
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insn_size = CGEN_INSN_BITSIZE(insn.insn);
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rl_type = rl_for (insn);
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/* We have to mark all the jumps, because we need to adjust them
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when we delete bytes, but we only need to mark the displacements
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if they're symbolic - if they're not, we've already picked the
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shortest opcode by now. The linker, however, will still have to
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check any operands to see if they're the displacement type, since
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we don't know (nor record) *which* operands are relaxable. */
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if (m32c_relax
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&& rl_type != RL_TYPE_NONE
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&& (rl_type == RL_TYPE_JUMP || results.num_fixups)
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&& !relaxable (insn))
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{
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int reloc = 0;
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int addend = results.num_fixups + 16 * insn_size/8;
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switch (rl_for (insn))
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{
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case RL_TYPE_JUMP: reloc = BFD_RELOC_M32C_RL_JUMP; break;
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case RL_TYPE_1ADDR: reloc = BFD_RELOC_M32C_RL_1ADDR; break;
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case RL_TYPE_2ADDR: reloc = BFD_RELOC_M32C_RL_2ADDR; break;
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}
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if (insn.insn->base->num == M32C_INSN_JMP16_S
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|| insn.insn->base->num == M32C_INSN_JMP32_S)
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addend = 0x10;
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fix_new (results.frag,
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results.addr - results.frag->fr_literal,
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0, abs_section_sym, addend, 0,
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reloc);
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}
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}
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/* The syntax in the manual says constants begin with '#'.
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We just ignore it. */
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void
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md_operand (expressionS * exp)
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{
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/* In case of a syntax error, escape back to try next syntax combo. */
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if (exp->X_op == O_absent)
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gas_cgen_md_operand (exp);
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}
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valueT
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md_section_align (segT segment, valueT size)
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{
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int align = bfd_section_alignment (segment);
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return ((size + (1 << align) - 1) & -(1 << align));
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}
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symbolS *
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md_undefined_symbol (char * name ATTRIBUTE_UNUSED)
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{
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return 0;
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}
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const relax_typeS md_relax_table[] =
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{
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/* The fields are:
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1) most positive reach of this state,
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2) most negative reach of this state,
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3) how many bytes this mode will have in the variable part of the frag
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4) which index into the table to try if we can't fit into this one. */
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/* 0 */ { 0, 0, 0, 0 }, /* unused */
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/* 1 */ { 0, 0, 0, 0 }, /* marker for "don't know yet" */
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||
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||
/* 2 */ { 127, -128, 2, 3 }, /* jcnd16_5.b */
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/* 3 */ { 32767, -32768, 5, 4 }, /* jcnd16_5.w */
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/* 4 */ { 0, 0, 6, 0 }, /* jcnd16_5.a */
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||
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/* 5 */ { 127, -128, 2, 6 }, /* jcnd16.b */
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/* 6 */ { 32767, -32768, 5, 7 }, /* jcnd16.w */
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/* 7 */ { 0, 0, 6, 0 }, /* jcnd16.a */
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||
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/* 8 */ { 8, 1, 1, 9 }, /* jmp16.s */
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/* 9 */ { 127, -128, 2, 10 }, /* jmp16.b */
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||
/* 10 */ { 32767, -32768, 3, 11 }, /* jmp16.w */
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||
/* 11 */ { 0, 0, 4, 0 }, /* jmp16.a */
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||
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||
/* 12 */ { 127, -128, 2, 13 }, /* jcnd32.b */
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||
/* 13 */ { 32767, -32768, 5, 14 }, /* jcnd32.w */
|
||
/* 14 */ { 0, 0, 6, 0 }, /* jcnd32.a */
|
||
|
||
/* 15 */ { 8, 1, 1, 16 }, /* jmp32.s */
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||
/* 16 */ { 127, -128, 2, 17 }, /* jmp32.b */
|
||
/* 17 */ { 32767, -32768, 3, 18 }, /* jmp32.w */
|
||
/* 18 */ { 0, 0, 4, 0 }, /* jmp32.a */
|
||
|
||
/* 19 */ { 32767, -32768, 3, 20 }, /* jsr16.w */
|
||
/* 20 */ { 0, 0, 4, 0 }, /* jsr16.a */
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||
/* 21 */ { 32767, -32768, 3, 11 }, /* jsr32.w */
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||
/* 22 */ { 0, 0, 4, 0 }, /* jsr32.a */
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||
|
||
/* 23 */ { 0, 0, 3, 0 }, /* adjnz pc8 */
|
||
/* 24 */ { 0, 0, 4, 0 }, /* adjnz disp8 pc8 */
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||
/* 25 */ { 0, 0, 5, 0 }, /* adjnz disp16 pc8 */
|
||
/* 26 */ { 0, 0, 6, 0 } /* adjnz disp24 pc8 */
|
||
};
|
||
|
||
enum {
|
||
M32C_MACRO_JCND16_5_W,
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||
M32C_MACRO_JCND16_5_A,
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||
M32C_MACRO_JCND16_W,
|
||
M32C_MACRO_JCND16_A,
|
||
M32C_MACRO_JCND32_W,
|
||
M32C_MACRO_JCND32_A,
|
||
/* the digit is the array index of the pcrel byte */
|
||
M32C_MACRO_ADJNZ_2,
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||
M32C_MACRO_ADJNZ_3,
|
||
M32C_MACRO_ADJNZ_4,
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||
M32C_MACRO_ADJNZ_5,
|
||
};
|
||
|
||
static struct {
|
||
int insn;
|
||
int bytes;
|
||
int insn_for_extern;
|
||
int pcrel_aim_offset;
|
||
} subtype_mappings[] = {
|
||
/* 0 */ { 0, 0, 0, 0 },
|
||
/* 1 */ { 0, 0, 0, 0 },
|
||
|
||
/* 2 */ { M32C_INSN_JCND16_5, 2, -M32C_MACRO_JCND16_5_A, 1 },
|
||
/* 3 */ { -M32C_MACRO_JCND16_5_W, 5, -M32C_MACRO_JCND16_5_A, 4 },
|
||
/* 4 */ { -M32C_MACRO_JCND16_5_A, 6, -M32C_MACRO_JCND16_5_A, 0 },
|
||
|
||
/* 5 */ { M32C_INSN_JCND16, 3, -M32C_MACRO_JCND16_A, 1 },
|
||
/* 6 */ { -M32C_MACRO_JCND16_W, 6, -M32C_MACRO_JCND16_A, 4 },
|
||
/* 7 */ { -M32C_MACRO_JCND16_A, 7, -M32C_MACRO_JCND16_A, 0 },
|
||
|
||
/* 8 */ { M32C_INSN_JMP16_S, 1, M32C_INSN_JMP16_A, 0 },
|
||
/* 9 */ { M32C_INSN_JMP16_B, 2, M32C_INSN_JMP16_A, 1 },
|
||
/* 10 */ { M32C_INSN_JMP16_W, 3, M32C_INSN_JMP16_A, 2 },
|
||
/* 11 */ { M32C_INSN_JMP16_A, 4, M32C_INSN_JMP16_A, 0 },
|
||
|
||
/* 12 */ { M32C_INSN_JCND32, 2, -M32C_MACRO_JCND32_A, 1 },
|
||
/* 13 */ { -M32C_MACRO_JCND32_W, 5, -M32C_MACRO_JCND32_A, 4 },
|
||
/* 14 */ { -M32C_MACRO_JCND32_A, 6, -M32C_MACRO_JCND32_A, 0 },
|
||
|
||
/* 15 */ { M32C_INSN_JMP32_S, 1, M32C_INSN_JMP32_A, 0 },
|
||
/* 16 */ { M32C_INSN_JMP32_B, 2, M32C_INSN_JMP32_A, 1 },
|
||
/* 17 */ { M32C_INSN_JMP32_W, 3, M32C_INSN_JMP32_A, 2 },
|
||
/* 18 */ { M32C_INSN_JMP32_A, 4, M32C_INSN_JMP32_A, 0 },
|
||
|
||
/* 19 */ { M32C_INSN_JSR16_W, 3, M32C_INSN_JSR16_A, 2 },
|
||
/* 20 */ { M32C_INSN_JSR16_A, 4, M32C_INSN_JSR16_A, 0 },
|
||
/* 21 */ { M32C_INSN_JSR32_W, 3, M32C_INSN_JSR32_A, 2 },
|
||
/* 22 */ { M32C_INSN_JSR32_A, 4, M32C_INSN_JSR32_A, 0 },
|
||
|
||
/* 23 */ { -M32C_MACRO_ADJNZ_2, 3, -M32C_MACRO_ADJNZ_2, 0 },
|
||
/* 24 */ { -M32C_MACRO_ADJNZ_3, 4, -M32C_MACRO_ADJNZ_3, 0 },
|
||
/* 25 */ { -M32C_MACRO_ADJNZ_4, 5, -M32C_MACRO_ADJNZ_4, 0 },
|
||
/* 26 */ { -M32C_MACRO_ADJNZ_5, 6, -M32C_MACRO_ADJNZ_5, 0 }
|
||
};
|
||
#define NUM_MAPPINGS (sizeof (subtype_mappings) / sizeof (subtype_mappings[0]))
|
||
|
||
void
|
||
m32c_prepare_relax_scan (fragS *fragP, offsetT *aim, relax_substateT this_state)
|
||
{
|
||
symbolS *symbolP = fragP->fr_symbol;
|
||
if (symbolP && !S_IS_DEFINED (symbolP))
|
||
*aim = 0;
|
||
/* Adjust for m32c pcrel not being relative to the next opcode. */
|
||
*aim += subtype_mappings[this_state].pcrel_aim_offset;
|
||
}
|
||
|
||
static int
|
||
insn_to_subtype (int inum, const CGEN_INSN *insn)
|
||
{
|
||
unsigned int i;
|
||
|
||
if (insn
|
||
&& (startswith (insn->base->mnemonic, "adjnz")
|
||
|| startswith (insn->base->mnemonic, "sbjnz")))
|
||
{
|
||
i = 23 + insn->base->bitsize/8 - 3;
|
||
/*printf("mapping %d used for %s\n", i, insn->base->mnemonic);*/
|
||
return i;
|
||
}
|
||
|
||
for (i=0; i<NUM_MAPPINGS; i++)
|
||
if (inum == subtype_mappings[i].insn)
|
||
{
|
||
/*printf("mapping %d used\n", i);*/
|
||
return i;
|
||
}
|
||
abort ();
|
||
}
|
||
|
||
/* Return an initial guess of the length by which a fragment must grow to
|
||
hold a branch to reach its destination.
|
||
Also updates fr_type/fr_subtype as necessary.
|
||
|
||
Called just before doing relaxation.
|
||
Any symbol that is now undefined will not become defined.
|
||
The guess for fr_var is ACTUALLY the growth beyond fr_fix.
|
||
Whatever we do to grow fr_fix or fr_var contributes to our returned value.
|
||
Although it may not be explicit in the frag, pretend fr_var starts with a
|
||
0 value. */
|
||
|
||
int
|
||
md_estimate_size_before_relax (fragS * fragP, segT segment ATTRIBUTE_UNUSED)
|
||
{
|
||
int where = fragP->fr_opcode - fragP->fr_literal;
|
||
|
||
if (fragP->fr_subtype == 1)
|
||
fragP->fr_subtype = insn_to_subtype (fragP->fr_cgen.insn->base->num, fragP->fr_cgen.insn);
|
||
|
||
if (S_GET_SEGMENT (fragP->fr_symbol) != segment)
|
||
{
|
||
int new_insn;
|
||
|
||
new_insn = subtype_mappings[fragP->fr_subtype].insn_for_extern;
|
||
fragP->fr_subtype = insn_to_subtype (new_insn, 0);
|
||
}
|
||
|
||
if (fragP->fr_cgen.insn->base
|
||
&& fragP->fr_cgen.insn->base->num
|
||
!= subtype_mappings[fragP->fr_subtype].insn
|
||
&& subtype_mappings[fragP->fr_subtype].insn > 0)
|
||
{
|
||
int new_insn= subtype_mappings[fragP->fr_subtype].insn;
|
||
if (new_insn >= 0)
|
||
{
|
||
fragP->fr_cgen.insn = (fragP->fr_cgen.insn
|
||
- fragP->fr_cgen.insn->base->num
|
||
+ new_insn);
|
||
}
|
||
}
|
||
|
||
return subtype_mappings[fragP->fr_subtype].bytes - (fragP->fr_fix - where);
|
||
}
|
||
|
||
/* *fragP has been relaxed to its final size, and now needs to have
|
||
the bytes inside it modified to conform to the new size.
|
||
|
||
Called after relaxation is finished.
|
||
fragP->fr_type == rs_machine_dependent.
|
||
fragP->fr_subtype is the subtype of what the address relaxed to. */
|
||
|
||
static int
|
||
target_address_for (fragS *frag)
|
||
{
|
||
int rv = frag->fr_offset;
|
||
symbolS *sym = frag->fr_symbol;
|
||
|
||
if (sym)
|
||
rv += S_GET_VALUE (sym);
|
||
|
||
/*printf("target_address_for returns %d\n", rv);*/
|
||
return rv;
|
||
}
|
||
|
||
void
|
||
md_convert_frag (bfd * abfd ATTRIBUTE_UNUSED,
|
||
segT sec ATTRIBUTE_UNUSED,
|
||
fragS * fragP ATTRIBUTE_UNUSED)
|
||
{
|
||
int addend;
|
||
int operand;
|
||
int where = fragP->fr_opcode - fragP->fr_literal;
|
||
int rl_where = fragP->fr_opcode - fragP->fr_literal;
|
||
unsigned char *op = (unsigned char *)fragP->fr_opcode;
|
||
int rl_addend = 0;
|
||
|
||
addend = target_address_for (fragP) - (fragP->fr_address + where);
|
||
|
||
fragP->fr_fix = where + subtype_mappings[fragP->fr_subtype].bytes;
|
||
|
||
switch (subtype_mappings[fragP->fr_subtype].insn)
|
||
{
|
||
case M32C_INSN_JCND16_5:
|
||
op[1] = addend - 1;
|
||
operand = M32C_OPERAND_LAB_8_8;
|
||
rl_addend = 0x21;
|
||
break;
|
||
|
||
case -M32C_MACRO_JCND16_5_W:
|
||
op[0] ^= 0x04;
|
||
op[1] = 4;
|
||
op[2] = 0xf4;
|
||
op[3] = addend - 3;
|
||
op[4] = (addend - 3) >> 8;
|
||
operand = M32C_OPERAND_LAB_8_16;
|
||
where += 2;
|
||
rl_addend = 0x51;
|
||
break;
|
||
|
||
case -M32C_MACRO_JCND16_5_A:
|
||
op[0] ^= 0x04;
|
||
op[1] = 5;
|
||
op[2] = 0xfc;
|
||
operand = M32C_OPERAND_LAB_8_24;
|
||
where += 2;
|
||
rl_addend = 0x61;
|
||
break;
|
||
|
||
|
||
case M32C_INSN_JCND16:
|
||
op[2] = addend - 2;
|
||
operand = M32C_OPERAND_LAB_16_8;
|
||
rl_addend = 0x31;
|
||
break;
|
||
|
||
case -M32C_MACRO_JCND16_W:
|
||
op[1] ^= 0x04;
|
||
op[2] = 4;
|
||
op[3] = 0xf4;
|
||
op[4] = addend - 4;
|
||
op[5] = (addend - 4) >> 8;
|
||
operand = M32C_OPERAND_LAB_8_16;
|
||
where += 3;
|
||
rl_addend = 0x61;
|
||
break;
|
||
|
||
case -M32C_MACRO_JCND16_A:
|
||
op[1] ^= 0x04;
|
||
op[2] = 5;
|
||
op[3] = 0xfc;
|
||
operand = M32C_OPERAND_LAB_8_24;
|
||
where += 3;
|
||
rl_addend = 0x71;
|
||
break;
|
||
|
||
case M32C_INSN_JMP16_S:
|
||
op[0] = 0x60 | ((addend-2) & 0x07);
|
||
operand = M32C_OPERAND_LAB_5_3;
|
||
rl_addend = 0x10;
|
||
break;
|
||
|
||
case M32C_INSN_JMP16_B:
|
||
op[0] = 0xfe;
|
||
op[1] = addend - 1;
|
||
operand = M32C_OPERAND_LAB_8_8;
|
||
rl_addend = 0x21;
|
||
break;
|
||
|
||
case M32C_INSN_JMP16_W:
|
||
op[0] = 0xf4;
|
||
op[1] = addend - 1;
|
||
op[2] = (addend - 1) >> 8;
|
||
operand = M32C_OPERAND_LAB_8_16;
|
||
rl_addend = 0x31;
|
||
break;
|
||
|
||
case M32C_INSN_JMP16_A:
|
||
op[0] = 0xfc;
|
||
op[1] = 0;
|
||
op[2] = 0;
|
||
op[3] = 0;
|
||
operand = M32C_OPERAND_LAB_8_24;
|
||
rl_addend = 0x41;
|
||
break;
|
||
|
||
case M32C_INSN_JCND32:
|
||
op[1] = addend - 1;
|
||
operand = M32C_OPERAND_LAB_8_8;
|
||
rl_addend = 0x21;
|
||
break;
|
||
|
||
case -M32C_MACRO_JCND32_W:
|
||
op[0] ^= 0x40;
|
||
op[1] = 4;
|
||
op[2] = 0xce;
|
||
op[3] = addend - 3;
|
||
op[4] = (addend - 3) >> 8;
|
||
operand = M32C_OPERAND_LAB_8_16;
|
||
where += 2;
|
||
rl_addend = 0x51;
|
||
break;
|
||
|
||
case -M32C_MACRO_JCND32_A:
|
||
op[0] ^= 0x40;
|
||
op[1] = 5;
|
||
op[2] = 0xcc;
|
||
operand = M32C_OPERAND_LAB_8_24;
|
||
where += 2;
|
||
rl_addend = 0x61;
|
||
break;
|
||
|
||
case M32C_INSN_JMP32_S:
|
||
addend = ((addend-2) & 0x07);
|
||
op[0] = 0x4a | (addend & 0x01) | ((addend << 3) & 0x30);
|
||
operand = M32C_OPERAND_LAB32_JMP_S;
|
||
rl_addend = 0x10;
|
||
break;
|
||
|
||
case M32C_INSN_JMP32_B:
|
||
op[0] = 0xbb;
|
||
op[1] = addend - 1;
|
||
operand = M32C_OPERAND_LAB_8_8;
|
||
rl_addend = 0x21;
|
||
break;
|
||
|
||
case M32C_INSN_JMP32_W:
|
||
op[0] = 0xce;
|
||
op[1] = addend - 1;
|
||
op[2] = (addend - 1) >> 8;
|
||
operand = M32C_OPERAND_LAB_8_16;
|
||
rl_addend = 0x31;
|
||
break;
|
||
|
||
case M32C_INSN_JMP32_A:
|
||
op[0] = 0xcc;
|
||
op[1] = 0;
|
||
op[2] = 0;
|
||
op[3] = 0;
|
||
operand = M32C_OPERAND_LAB_8_24;
|
||
rl_addend = 0x41;
|
||
break;
|
||
|
||
|
||
case M32C_INSN_JSR16_W:
|
||
op[0] = 0xf5;
|
||
op[1] = addend - 1;
|
||
op[2] = (addend - 1) >> 8;
|
||
operand = M32C_OPERAND_LAB_8_16;
|
||
rl_addend = 0x31;
|
||
break;
|
||
|
||
case M32C_INSN_JSR16_A:
|
||
op[0] = 0xfd;
|
||
op[1] = 0;
|
||
op[2] = 0;
|
||
op[3] = 0;
|
||
operand = M32C_OPERAND_LAB_8_24;
|
||
rl_addend = 0x41;
|
||
break;
|
||
|
||
case M32C_INSN_JSR32_W:
|
||
op[0] = 0xcf;
|
||
op[1] = addend - 1;
|
||
op[2] = (addend - 1) >> 8;
|
||
operand = M32C_OPERAND_LAB_8_16;
|
||
rl_addend = 0x31;
|
||
break;
|
||
|
||
case M32C_INSN_JSR32_A:
|
||
op[0] = 0xcd;
|
||
op[1] = 0;
|
||
op[2] = 0;
|
||
op[3] = 0;
|
||
operand = M32C_OPERAND_LAB_8_24;
|
||
rl_addend = 0x41;
|
||
break;
|
||
|
||
case -M32C_MACRO_ADJNZ_2:
|
||
rl_addend = 0x31;
|
||
op[2] = addend - 2;
|
||
operand = M32C_OPERAND_LAB_16_8;
|
||
break;
|
||
case -M32C_MACRO_ADJNZ_3:
|
||
rl_addend = 0x41;
|
||
op[3] = addend - 2;
|
||
operand = M32C_OPERAND_LAB_24_8;
|
||
break;
|
||
case -M32C_MACRO_ADJNZ_4:
|
||
rl_addend = 0x51;
|
||
op[4] = addend - 2;
|
||
operand = M32C_OPERAND_LAB_32_8;
|
||
break;
|
||
case -M32C_MACRO_ADJNZ_5:
|
||
rl_addend = 0x61;
|
||
op[5] = addend - 2;
|
||
operand = M32C_OPERAND_LAB_40_8;
|
||
break;
|
||
|
||
default:
|
||
printf("\nHey! Need more opcode converters! missing: %d %s\n\n",
|
||
fragP->fr_subtype,
|
||
fragP->fr_cgen.insn->base->name);
|
||
abort();
|
||
}
|
||
|
||
if (m32c_relax)
|
||
{
|
||
if (operand != M32C_OPERAND_LAB_8_24)
|
||
fragP->fr_offset = (fragP->fr_address + where);
|
||
|
||
fix_new (fragP,
|
||
rl_where,
|
||
0, abs_section_sym, rl_addend, 0,
|
||
BFD_RELOC_M32C_RL_JUMP);
|
||
}
|
||
|
||
if (S_GET_SEGMENT (fragP->fr_symbol) != sec
|
||
|| operand == M32C_OPERAND_LAB_8_24
|
||
|| (m32c_relax && (operand != M32C_OPERAND_LAB_5_3
|
||
&& operand != M32C_OPERAND_LAB32_JMP_S)))
|
||
{
|
||
gas_assert (fragP->fr_cgen.insn != 0);
|
||
gas_cgen_record_fixup (fragP,
|
||
where,
|
||
fragP->fr_cgen.insn,
|
||
(fragP->fr_fix - where) * 8,
|
||
cgen_operand_lookup_by_num (gas_cgen_cpu_desc,
|
||
operand),
|
||
fragP->fr_cgen.opinfo,
|
||
fragP->fr_symbol,
|
||
fragP->fr_offset);
|
||
}
|
||
}
|
||
|
||
/* Functions concerning relocs. */
|
||
|
||
/* The location from which a PC relative jump should be calculated,
|
||
given a PC relative reloc. */
|
||
|
||
long
|
||
md_pcrel_from_section (fixS * fixP, segT sec)
|
||
{
|
||
if (fixP->fx_addsy != (symbolS *) NULL
|
||
&& (! S_IS_DEFINED (fixP->fx_addsy)
|
||
|| S_GET_SEGMENT (fixP->fx_addsy) != sec))
|
||
/* The symbol is undefined (or is defined but not in this section).
|
||
Let the linker figure it out. */
|
||
return 0;
|
||
|
||
return (fixP->fx_frag->fr_address + fixP->fx_where);
|
||
}
|
||
|
||
/* Return the bfd reloc type for OPERAND of INSN at fixup FIXP.
|
||
Returns BFD_RELOC_NONE if no reloc type can be found.
|
||
*FIXP may be modified if desired. */
|
||
|
||
bfd_reloc_code_real_type
|
||
md_cgen_lookup_reloc (const CGEN_INSN * insn ATTRIBUTE_UNUSED,
|
||
const CGEN_OPERAND * operand,
|
||
fixS * fixP ATTRIBUTE_UNUSED)
|
||
{
|
||
static const struct op_reloc {
|
||
/* A CGEN operand type that can be a relocatable expression. */
|
||
CGEN_OPERAND_TYPE operand;
|
||
|
||
/* The appropriate BFD reloc type to use for that. */
|
||
bfd_reloc_code_real_type reloc;
|
||
|
||
/* The offset from the start of the instruction to the field to be
|
||
relocated, in bytes. */
|
||
int offset;
|
||
} op_reloc_table[] = {
|
||
|
||
/* PC-REL relocs for 8-bit fields. */
|
||
{ M32C_OPERAND_LAB_8_8, BFD_RELOC_8_PCREL, 1 },
|
||
{ M32C_OPERAND_LAB_16_8, BFD_RELOC_8_PCREL, 2 },
|
||
{ M32C_OPERAND_LAB_24_8, BFD_RELOC_8_PCREL, 3 },
|
||
{ M32C_OPERAND_LAB_32_8, BFD_RELOC_8_PCREL, 4 },
|
||
{ M32C_OPERAND_LAB_40_8, BFD_RELOC_8_PCREL, 5 },
|
||
|
||
/* PC-REL relocs for 16-bit fields. */
|
||
{ M32C_OPERAND_LAB_8_16, BFD_RELOC_16_PCREL, 1 },
|
||
|
||
/* Absolute relocs for 8-bit fields. */
|
||
{ M32C_OPERAND_IMM_8_QI, BFD_RELOC_8, 1 },
|
||
{ M32C_OPERAND_IMM_16_QI, BFD_RELOC_8, 2 },
|
||
{ M32C_OPERAND_IMM_24_QI, BFD_RELOC_8, 3 },
|
||
{ M32C_OPERAND_IMM_32_QI, BFD_RELOC_8, 4 },
|
||
{ M32C_OPERAND_IMM_40_QI, BFD_RELOC_8, 5 },
|
||
{ M32C_OPERAND_IMM_48_QI, BFD_RELOC_8, 6 },
|
||
{ M32C_OPERAND_IMM_56_QI, BFD_RELOC_8, 7 },
|
||
{ M32C_OPERAND_DSP_8_S8, BFD_RELOC_8, 1 },
|
||
{ M32C_OPERAND_DSP_16_S8, BFD_RELOC_8, 2 },
|
||
{ M32C_OPERAND_DSP_24_S8, BFD_RELOC_8, 3 },
|
||
{ M32C_OPERAND_DSP_32_S8, BFD_RELOC_8, 4 },
|
||
{ M32C_OPERAND_DSP_40_S8, BFD_RELOC_8, 5 },
|
||
{ M32C_OPERAND_DSP_48_S8, BFD_RELOC_8, 6 },
|
||
{ M32C_OPERAND_DSP_8_U8, BFD_RELOC_8, 1 },
|
||
{ M32C_OPERAND_DSP_16_U8, BFD_RELOC_8, 2 },
|
||
{ M32C_OPERAND_DSP_24_U8, BFD_RELOC_8, 3 },
|
||
{ M32C_OPERAND_DSP_32_U8, BFD_RELOC_8, 4 },
|
||
{ M32C_OPERAND_DSP_40_U8, BFD_RELOC_8, 5 },
|
||
{ M32C_OPERAND_DSP_48_U8, BFD_RELOC_8, 6 },
|
||
{ M32C_OPERAND_BITBASE32_16_S11_UNPREFIXED, BFD_RELOC_8, 2 },
|
||
{ M32C_OPERAND_BITBASE32_16_U11_UNPREFIXED, BFD_RELOC_8, 2 },
|
||
{ M32C_OPERAND_BITBASE32_24_S11_PREFIXED, BFD_RELOC_8, 3 },
|
||
{ M32C_OPERAND_BITBASE32_24_U11_PREFIXED, BFD_RELOC_8, 3 },
|
||
|
||
/* Absolute relocs for 16-bit fields. */
|
||
{ M32C_OPERAND_IMM_8_HI, BFD_RELOC_16, 1 },
|
||
{ M32C_OPERAND_IMM_16_HI, BFD_RELOC_16, 2 },
|
||
{ M32C_OPERAND_IMM_24_HI, BFD_RELOC_16, 3 },
|
||
{ M32C_OPERAND_IMM_32_HI, BFD_RELOC_16, 4 },
|
||
{ M32C_OPERAND_IMM_40_HI, BFD_RELOC_16, 5 },
|
||
{ M32C_OPERAND_IMM_48_HI, BFD_RELOC_16, 6 },
|
||
{ M32C_OPERAND_IMM_56_HI, BFD_RELOC_16, 7 },
|
||
{ M32C_OPERAND_IMM_64_HI, BFD_RELOC_16, 8 },
|
||
{ M32C_OPERAND_DSP_16_S16, BFD_RELOC_16, 2 },
|
||
{ M32C_OPERAND_DSP_24_S16, BFD_RELOC_16, 3 },
|
||
{ M32C_OPERAND_DSP_32_S16, BFD_RELOC_16, 4 },
|
||
{ M32C_OPERAND_DSP_40_S16, BFD_RELOC_16, 5 },
|
||
{ M32C_OPERAND_DSP_8_U16, BFD_RELOC_16, 1 },
|
||
{ M32C_OPERAND_DSP_16_U16, BFD_RELOC_16, 2 },
|
||
{ M32C_OPERAND_DSP_24_U16, BFD_RELOC_16, 3 },
|
||
{ M32C_OPERAND_DSP_32_U16, BFD_RELOC_16, 4 },
|
||
{ M32C_OPERAND_DSP_40_U16, BFD_RELOC_16, 5 },
|
||
{ M32C_OPERAND_DSP_48_U16, BFD_RELOC_16, 6 },
|
||
{ M32C_OPERAND_BITBASE32_16_S19_UNPREFIXED, BFD_RELOC_16, 2 },
|
||
{ M32C_OPERAND_BITBASE32_16_U19_UNPREFIXED, BFD_RELOC_16, 2 },
|
||
{ M32C_OPERAND_BITBASE32_24_S19_PREFIXED, BFD_RELOC_16, 3 },
|
||
{ M32C_OPERAND_BITBASE32_24_U19_PREFIXED, BFD_RELOC_16, 3 },
|
||
|
||
/* Absolute relocs for 24-bit fields. */
|
||
{ M32C_OPERAND_LAB_8_24, BFD_RELOC_24, 1 },
|
||
{ M32C_OPERAND_DSP_8_S24, BFD_RELOC_24, 1 },
|
||
{ M32C_OPERAND_DSP_8_U24, BFD_RELOC_24, 1 },
|
||
{ M32C_OPERAND_DSP_16_U24, BFD_RELOC_24, 2 },
|
||
{ M32C_OPERAND_DSP_24_U24, BFD_RELOC_24, 3 },
|
||
{ M32C_OPERAND_DSP_32_U24, BFD_RELOC_24, 4 },
|
||
{ M32C_OPERAND_DSP_40_U24, BFD_RELOC_24, 5 },
|
||
{ M32C_OPERAND_DSP_48_U24, BFD_RELOC_24, 6 },
|
||
{ M32C_OPERAND_DSP_16_U20, BFD_RELOC_24, 2 },
|
||
{ M32C_OPERAND_DSP_24_U20, BFD_RELOC_24, 3 },
|
||
{ M32C_OPERAND_DSP_32_U20, BFD_RELOC_24, 4 },
|
||
{ M32C_OPERAND_BITBASE32_16_U27_UNPREFIXED, BFD_RELOC_24, 2 },
|
||
{ M32C_OPERAND_BITBASE32_24_U27_PREFIXED, BFD_RELOC_24, 3 },
|
||
|
||
/* Absolute relocs for 32-bit fields. */
|
||
{ M32C_OPERAND_IMM_16_SI, BFD_RELOC_32, 2 },
|
||
{ M32C_OPERAND_IMM_24_SI, BFD_RELOC_32, 3 },
|
||
{ M32C_OPERAND_IMM_32_SI, BFD_RELOC_32, 4 },
|
||
{ M32C_OPERAND_IMM_40_SI, BFD_RELOC_32, 5 },
|
||
|
||
};
|
||
|
||
int i;
|
||
|
||
for (i = ARRAY_SIZE (op_reloc_table); --i >= 0; )
|
||
{
|
||
const struct op_reloc *or = &op_reloc_table[i];
|
||
|
||
if (or->operand == operand->type)
|
||
{
|
||
fixP->fx_where += or->offset;
|
||
fixP->fx_size -= or->offset;
|
||
|
||
if (fixP->fx_cgen.opinfo
|
||
&& fixP->fx_cgen.opinfo != BFD_RELOC_NONE)
|
||
return fixP->fx_cgen.opinfo;
|
||
|
||
return or->reloc;
|
||
}
|
||
}
|
||
|
||
fprintf
|
||
(stderr,
|
||
"Error: tc-m32c.c:md_cgen_lookup_reloc Unimplemented relocation for operand %s\n",
|
||
operand->name);
|
||
|
||
return BFD_RELOC_NONE;
|
||
}
|
||
|
||
void
|
||
m32c_cons_fix_new (fragS * frag,
|
||
int where,
|
||
int size,
|
||
expressionS *exp,
|
||
bfd_reloc_code_real_type type)
|
||
{
|
||
switch (size)
|
||
{
|
||
case 1:
|
||
type = BFD_RELOC_8;
|
||
break;
|
||
case 2:
|
||
type = BFD_RELOC_16;
|
||
break;
|
||
case 3:
|
||
type = BFD_RELOC_24;
|
||
break;
|
||
case 4:
|
||
default:
|
||
type = BFD_RELOC_32;
|
||
break;
|
||
case 8:
|
||
type = BFD_RELOC_64;
|
||
break;
|
||
}
|
||
|
||
fix_new_exp (frag, where, (int) size, exp, 0, type);
|
||
}
|
||
|
||
void
|
||
m32c_apply_fix (struct fix *f, valueT *t, segT s)
|
||
{
|
||
if (f->fx_r_type == BFD_RELOC_M32C_RL_JUMP
|
||
|| f->fx_r_type == BFD_RELOC_M32C_RL_1ADDR
|
||
|| f->fx_r_type == BFD_RELOC_M32C_RL_2ADDR)
|
||
return;
|
||
gas_cgen_md_apply_fix (f, t, s);
|
||
}
|
||
|
||
arelent *
|
||
tc_gen_reloc (asection *sec, fixS *fx)
|
||
{
|
||
if (fx->fx_r_type == BFD_RELOC_M32C_RL_JUMP
|
||
|| fx->fx_r_type == BFD_RELOC_M32C_RL_1ADDR
|
||
|| fx->fx_r_type == BFD_RELOC_M32C_RL_2ADDR)
|
||
{
|
||
arelent * reloc;
|
||
|
||
reloc = XNEW (arelent);
|
||
|
||
reloc->sym_ptr_ptr = XNEW (asymbol *);
|
||
*reloc->sym_ptr_ptr = symbol_get_bfdsym (fx->fx_addsy);
|
||
reloc->address = fx->fx_frag->fr_address + fx->fx_where;
|
||
reloc->howto = bfd_reloc_type_lookup (stdoutput, fx->fx_r_type);
|
||
reloc->addend = fx->fx_offset;
|
||
return reloc;
|
||
|
||
}
|
||
return gas_cgen_tc_gen_reloc (sec, fx);
|
||
}
|
||
|
||
/* See whether we need to force a relocation into the output file.
|
||
This is used to force out switch and PC relative relocations when
|
||
relaxing. */
|
||
|
||
int
|
||
m32c_force_relocation (fixS * fixp)
|
||
{
|
||
int reloc = fixp->fx_r_type;
|
||
|
||
if (reloc > (int)BFD_RELOC_UNUSED)
|
||
{
|
||
reloc -= (int)BFD_RELOC_UNUSED;
|
||
switch (reloc)
|
||
{
|
||
case M32C_OPERAND_DSP_32_S16:
|
||
case M32C_OPERAND_DSP_32_U16:
|
||
case M32C_OPERAND_IMM_32_HI:
|
||
case M32C_OPERAND_DSP_16_S16:
|
||
case M32C_OPERAND_DSP_16_U16:
|
||
case M32C_OPERAND_IMM_16_HI:
|
||
case M32C_OPERAND_DSP_24_S16:
|
||
case M32C_OPERAND_DSP_24_U16:
|
||
case M32C_OPERAND_IMM_24_HI:
|
||
return 1;
|
||
|
||
/* If we're doing linker relaxing, we need to keep all the
|
||
pc-relative jumps in case we need to fix them due to
|
||
deleted bytes between the jump and its destination. */
|
||
case M32C_OPERAND_LAB_8_8:
|
||
case M32C_OPERAND_LAB_8_16:
|
||
case M32C_OPERAND_LAB_8_24:
|
||
case M32C_OPERAND_LAB_16_8:
|
||
case M32C_OPERAND_LAB_24_8:
|
||
case M32C_OPERAND_LAB_32_8:
|
||
case M32C_OPERAND_LAB_40_8:
|
||
if (m32c_relax)
|
||
return 1;
|
||
default:
|
||
break;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
switch (fixp->fx_r_type)
|
||
{
|
||
case BFD_RELOC_16:
|
||
return 1;
|
||
|
||
case BFD_RELOC_M32C_RL_JUMP:
|
||
case BFD_RELOC_M32C_RL_1ADDR:
|
||
case BFD_RELOC_M32C_RL_2ADDR:
|
||
case BFD_RELOC_8_PCREL:
|
||
case BFD_RELOC_16_PCREL:
|
||
if (m32c_relax)
|
||
return 1;
|
||
default:
|
||
break;
|
||
}
|
||
}
|
||
|
||
return generic_force_reloc (fixp);
|
||
}
|
||
|
||
/* Write a value out to the object file, using the appropriate endianness. */
|
||
|
||
void
|
||
md_number_to_chars (char * buf, valueT val, int n)
|
||
{
|
||
number_to_chars_littleendian (buf, val, n);
|
||
}
|
||
|
||
/* Turn a string in input_line_pointer into a floating point constant of type
|
||
type, and store the appropriate bytes in *litP. The number of LITTLENUMS
|
||
emitted is stored in *sizeP . An error message is returned, or NULL on OK. */
|
||
|
||
const char *
|
||
md_atof (int type, char * litP, int * sizeP)
|
||
{
|
||
return ieee_md_atof (type, litP, sizeP, true);
|
||
}
|
||
|
||
bool
|
||
m32c_fix_adjustable (fixS * fixP)
|
||
{
|
||
int reloc;
|
||
if (fixP->fx_addsy == NULL)
|
||
return 1;
|
||
|
||
/* We need the symbol name for the VTABLE entries. */
|
||
reloc = fixP->fx_r_type;
|
||
if (reloc > (int)BFD_RELOC_UNUSED)
|
||
{
|
||
reloc -= (int)BFD_RELOC_UNUSED;
|
||
switch (reloc)
|
||
{
|
||
case M32C_OPERAND_DSP_32_S16:
|
||
case M32C_OPERAND_DSP_32_U16:
|
||
case M32C_OPERAND_IMM_32_HI:
|
||
case M32C_OPERAND_DSP_16_S16:
|
||
case M32C_OPERAND_DSP_16_U16:
|
||
case M32C_OPERAND_IMM_16_HI:
|
||
case M32C_OPERAND_DSP_24_S16:
|
||
case M32C_OPERAND_DSP_24_U16:
|
||
case M32C_OPERAND_IMM_24_HI:
|
||
return 0;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
if (fixP->fx_r_type == BFD_RELOC_16)
|
||
return 0;
|
||
}
|
||
|
||
/* Do not adjust relocations involving symbols in merged sections.
|
||
|
||
A reloc patching in the value of some symbol S plus some addend A
|
||
can be produced in different ways:
|
||
|
||
1) It might simply be a reference to the data at S + A. Clearly,
|
||
if linker merging shift that data around, the value patched in
|
||
by the reloc needs to be adjusted accordingly.
|
||
|
||
2) Or, it might be a reference to S, with A added in as a constant
|
||
bias. For example, given code like this:
|
||
|
||
static int S[100];
|
||
|
||
... S[i - 8] ...
|
||
|
||
it would be reasonable for the compiler to rearrange the array
|
||
reference to something like:
|
||
|
||
... (S-8)[i] ...
|
||
|
||
and emit assembly code that refers to S - (8 * sizeof (int)),
|
||
so the subtraction is done entirely at compile-time. In this
|
||
case, the reloc's addend A would be -(8 * sizeof (int)), and
|
||
shifting around code or data at S + A should not affect the
|
||
reloc: the reloc isn't referring to that code or data at all.
|
||
|
||
The linker has no way of knowing which case it has in hand. So,
|
||
to disambiguate, we have the linker always treat reloc addends as
|
||
in case 2): they're constants that should be simply added to the
|
||
symbol value, just like the reloc says. And we express case 1)
|
||
in different way: we have the compiler place a label at the real
|
||
target, and reference that label with an addend of zero. (The
|
||
compiler is unlikely to reference code using a label plus an
|
||
offset anyway, since it doesn't know the sizes of the
|
||
instructions.)
|
||
|
||
The simplification being done by gas/write.c:adjust_reloc_syms,
|
||
however, turns the explicit-label usage into the label-plus-
|
||
offset usage, re-introducing the ambiguity the compiler avoided.
|
||
So we need to disable that simplification for symbols referring
|
||
to merged data.
|
||
|
||
This only affects object size a little bit. */
|
||
if (S_GET_SEGMENT (fixP->fx_addsy)->flags & SEC_MERGE)
|
||
return 0;
|
||
|
||
if (m32c_relax)
|
||
return 0;
|
||
|
||
return 1;
|
||
}
|
||
|
||
/* Worker function for m32c_is_colon_insn(). */
|
||
static int
|
||
restore_colon (char *next_i_l_p, char *nul_char)
|
||
{
|
||
/* Restore the colon, and advance input_line_pointer to
|
||
the end of the new symbol. */
|
||
*input_line_pointer = *nul_char;
|
||
input_line_pointer = next_i_l_p;
|
||
*nul_char = *next_i_l_p;
|
||
*next_i_l_p = 0;
|
||
return 1;
|
||
}
|
||
|
||
/* Determines if the symbol starting at START and ending in
|
||
a colon that was at the location pointed to by INPUT_LINE_POINTER
|
||
(but which has now been replaced bu a NUL) is in fact an
|
||
:Z, :S, :Q, or :G suffix.
|
||
If it is, then it restores the colon, advances INPUT_LINE_POINTER
|
||
to the real end of the instruction/symbol, saves the char there to
|
||
NUL_CHAR and pokes a NUL, and returns 1. Otherwise it returns 0. */
|
||
int
|
||
m32c_is_colon_insn (char *start ATTRIBUTE_UNUSED, char *nul_char)
|
||
{
|
||
char * i_l_p = input_line_pointer;
|
||
|
||
if (*nul_char == '"')
|
||
++i_l_p;
|
||
|
||
/* Check to see if the text following the colon is 'G' */
|
||
if (TOLOWER (i_l_p[1]) == 'g' && (i_l_p[2] == ' ' || i_l_p[2] == '\t'))
|
||
return restore_colon (i_l_p + 2, nul_char);
|
||
|
||
/* Check to see if the text following the colon is 'Q' */
|
||
if (TOLOWER (i_l_p[1]) == 'q' && (i_l_p[2] == ' ' || i_l_p[2] == '\t'))
|
||
return restore_colon (i_l_p + 2, nul_char);
|
||
|
||
/* Check to see if the text following the colon is 'S' */
|
||
if (TOLOWER (i_l_p[1]) == 's' && (i_l_p[2] == ' ' || i_l_p[2] == '\t'))
|
||
return restore_colon (i_l_p + 2, nul_char);
|
||
|
||
/* Check to see if the text following the colon is 'Z' */
|
||
if (TOLOWER (i_l_p[1]) == 'z' && (i_l_p[2] == ' ' || i_l_p[2] == '\t'))
|
||
return restore_colon (i_l_p + 2, nul_char);
|
||
|
||
return 0;
|
||
}
|