650 lines
14 KiB
C
650 lines
14 KiB
C
/* Dwarf2 assembler output helper routines.
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Copyright (C) 2001 Free Software Foundation, Inc.
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This file is part of GNU CC.
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GNU CC 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 2, or (at your option)
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any later version.
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GNU CC 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 GNU CC; see the file COPYING. If not, write to
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the Free Software Foundation, 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include "config.h"
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#include "system.h"
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#include "flags.h"
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#include "rtl.h"
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#include "output.h"
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#include "dwarf2asm.h"
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#include "tm_p.h"
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/* How to start an assembler comment. */
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#ifndef ASM_COMMENT_START
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#define ASM_COMMENT_START ";#"
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#endif
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/* Definitions of defaults for assembler-dependent names of various
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pseudo-ops and section names. These may be overridden in the tm.h
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file (if necessary) for a particular assembler. */
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#ifdef OBJECT_FORMAT_ELF
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#ifndef UNALIGNED_SHORT_ASM_OP
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#define UNALIGNED_SHORT_ASM_OP "\t.2byte\t"
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#endif
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#ifndef UNALIGNED_INT_ASM_OP
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#define UNALIGNED_INT_ASM_OP "\t.4byte\t"
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#endif
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#ifndef UNALIGNED_DOUBLE_INT_ASM_OP
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#define UNALIGNED_DOUBLE_INT_ASM_OP "\t.8byte\t"
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#endif
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#endif /* OBJECT_FORMAT_ELF */
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#ifndef ASM_BYTE_OP
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#define ASM_BYTE_OP "\t.byte\t"
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#endif
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/* We don't have unaligned support, let's hope the normal output works for
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.debug_frame. But we know it won't work for .debug_info. */
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#if !defined(UNALIGNED_INT_ASM_OP) && defined(DWARF2_DEBUGGING_INFO)
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#error DWARF2_DEBUGGING_INFO requires UNALIGNED_INT_ASM_OP.
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#endif
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#ifdef UNALIGNED_INT_ASM_OP
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static const char * unaligned_integer_asm_op PARAMS ((int));
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static inline const char *
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unaligned_integer_asm_op (size)
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int size;
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{
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const char *op;
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switch (size)
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{
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case 1:
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op = ASM_BYTE_OP;
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break;
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case 2:
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op = UNALIGNED_SHORT_ASM_OP;
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break;
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case 4:
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op = UNALIGNED_INT_ASM_OP;
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break;
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case 8:
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#ifdef UNALIGNED_DOUBLE_INT_ASM_OP
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op = UNALIGNED_DOUBLE_INT_ASM_OP;
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break;
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#endif
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default:
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abort ();
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}
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return op;
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}
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#endif /* UNALIGNED_INT_ASM_OP */
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/* Output an immediate constant in a given size. */
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void
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dw2_asm_output_data VPARAMS ((int size, unsigned HOST_WIDE_INT value,
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const char *comment, ...))
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{
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#ifndef ANSI_PROTOTYPES
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int size;
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unsigned HOST_WIDE_INT value;
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const char *comment;
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#endif
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va_list ap;
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VA_START (ap, comment);
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#ifndef ANSI_PROTOTYPES
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size = va_arg (ap, int);
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value = va_arg (ap, unsigned HOST_WIDE_INT);
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comment = va_arg (ap, const char *);
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#endif
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if (size * 8 < HOST_BITS_PER_WIDE_INT)
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value &= ~(~(unsigned HOST_WIDE_INT)0 << (size * 8));
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#ifdef UNALIGNED_INT_ASM_OP
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fputs (unaligned_integer_asm_op (size), asm_out_file);
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fprintf (asm_out_file, HOST_WIDE_INT_PRINT_HEX, value);
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#else
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assemble_integer (GEN_INT (value), size, 1);
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#endif
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if (flag_debug_asm && comment)
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{
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fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
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vfprintf (asm_out_file, comment, ap);
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}
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fputc ('\n', asm_out_file);
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va_end (ap);
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}
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/* Output the difference between two symbols in a given size. */
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/* ??? There appear to be assemblers that do not like such
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subtraction, but do support ASM_SET_OP. It's unfortunately
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impossible to do here, since the ASM_SET_OP for the difference
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symbol must appear after both symbols are defined. */
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void
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dw2_asm_output_delta VPARAMS ((int size, const char *lab1, const char *lab2,
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const char *comment, ...))
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{
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#ifndef ANSI_PROTOTYPES
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int size;
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const char *lab1, *lab2;
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const char *comment;
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#endif
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va_list ap;
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VA_START (ap, comment);
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#ifndef ANSI_PROTOTYPES
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size = va_arg (ap, int);
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lab1 = va_arg (ap, const char *);
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lab2 = va_arg (ap, const char *);
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comment = va_arg (ap, const char *);
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#endif
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#ifdef UNALIGNED_INT_ASM_OP
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fputs (unaligned_integer_asm_op (size), asm_out_file);
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assemble_name (asm_out_file, lab1);
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fputc ('-', asm_out_file);
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assemble_name (asm_out_file, lab2);
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#else
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assemble_integer (gen_rtx_MINUS (smallest_mode_for_size (size, MODE_INT),
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gen_rtx_SYMBOL_REF (Pmode, lab1),
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gen_rtx_SYMBOL_REF (Pmode, lab2)),
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size, 1);
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#endif
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if (flag_debug_asm && comment)
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{
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fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
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vfprintf (asm_out_file, comment, ap);
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}
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fputc ('\n', asm_out_file);
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va_end (ap);
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}
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/* Output a section-relative reference to a label. In general this
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can only be done for debugging symbols. E.g. on most targets with
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the GNU linker, this is accomplished with a direct reference and
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the knowledge that the debugging section will be placed at VMA 0.
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Some targets have special relocations for this that we must use. */
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void
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dw2_asm_output_offset VPARAMS ((int size, const char *label,
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const char *comment, ...))
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{
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#ifndef ANSI_PROTOTYPES
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int size;
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const char *label;
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const char *comment;
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#endif
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va_list ap;
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VA_START (ap, comment);
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#ifndef ANSI_PROTOTYPES
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size = va_arg (ap, int);
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label = va_arg (ap, const char *);
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comment = va_arg (ap, const char *);
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#endif
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#ifdef ASM_OUTPUT_DWARF_OFFSET
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ASM_OUTPUT_DWARF_OFFSET (asm_out_file, size, label);
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#else
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#ifdef UNALIGNED_INT_ASM_OP
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fputs (unaligned_integer_asm_op (size), asm_out_file);
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assemble_name (asm_out_file, label);
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#else
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assemble_integer (gen_rtx_SYMBOL_REF (Pmode, label), size, 1);
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#endif
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#endif
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if (flag_debug_asm && comment)
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{
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fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
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vfprintf (asm_out_file, comment, ap);
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}
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fputc ('\n', asm_out_file);
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va_end (ap);
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}
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/* Output a self-relative reference to a label, possibly in a
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different section or object file. */
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void
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dw2_asm_output_pcrel VPARAMS ((int size, const char *label,
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const char *comment, ...))
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{
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#ifndef ANSI_PROTOTYPES
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int size;
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const char *label;
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const char *comment;
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#endif
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va_list ap;
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VA_START (ap, comment);
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#ifndef ANSI_PROTOTYPES
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size = va_arg (ap, int);
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label = va_arg (ap, const char *);
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comment = va_arg (ap, const char *);
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#endif
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#ifdef ASM_OUTPUT_DWARF_PCREL
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ASM_OUTPUT_DWARF_PCREL (asm_out_file, size, label);
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#else
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#ifdef UNALIGNED_INT_ASM_OP
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fputs (unaligned_integer_asm_op (size), asm_out_file);
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assemble_name (asm_out_file, label);
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fputc ('-', asm_out_file);
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fputc ('.', asm_out_file);
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#else
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abort ();
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#endif
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#endif
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if (flag_debug_asm && comment)
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{
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fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
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vfprintf (asm_out_file, comment, ap);
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}
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fputc ('\n', asm_out_file);
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va_end (ap);
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}
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/* Output an absolute reference to a label. */
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void
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dw2_asm_output_addr VPARAMS ((int size, const char *label,
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const char *comment, ...))
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{
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#ifndef ANSI_PROTOTYPES
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int size;
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const char *label;
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const char *comment;
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#endif
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va_list ap;
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VA_START (ap, comment);
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#ifndef ANSI_PROTOTYPES
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size = va_arg (ap, int);
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label = va_arg (ap, const char *);
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comment = va_arg (ap, const char *);
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#endif
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#ifdef UNALIGNED_INT_ASM_OP
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fputs (unaligned_integer_asm_op (size), asm_out_file);
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assemble_name (asm_out_file, label);
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#else
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assemble_integer (gen_rtx_SYMBOL_REF (Pmode, label), size, 1);
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#endif
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if (flag_debug_asm && comment)
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{
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fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
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vfprintf (asm_out_file, comment, ap);
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}
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fputc ('\n', asm_out_file);
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va_end (ap);
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}
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/* Similar, but use an RTX expression instead of a text label. */
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void
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dw2_asm_output_addr_rtx VPARAMS ((int size, rtx addr,
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const char *comment, ...))
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{
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#ifndef ANSI_PROTOTYPES
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int size;
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rtx addr;
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const char *comment;
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#endif
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va_list ap;
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VA_START (ap, comment);
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#ifndef ANSI_PROTOTYPES
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size = va_arg (ap, int);
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addr = va_arg (ap, rtx);
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comment = va_arg (ap, const char *);
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#endif
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#ifdef UNALIGNED_INT_ASM_OP
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fputs (unaligned_integer_asm_op (size), asm_out_file);
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output_addr_const (asm_out_file, addr);
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#else
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assemble_integer (addr, size, 1);
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#endif
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if (flag_debug_asm && comment)
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{
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fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
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vfprintf (asm_out_file, comment, ap);
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}
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fputc ('\n', asm_out_file);
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va_end (ap);
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}
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void
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dw2_asm_output_nstring VPARAMS ((const char *str, size_t orig_len,
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const char *comment, ...))
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{
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#ifndef ANSI_PROTOTYPES
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const char *str;
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size_t orig_len;
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const char *comment;
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#endif
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va_list ap;
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size_t i, len = orig_len;
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VA_START (ap, comment);
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#ifndef ANSI_PROTOTYPES
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str = va_arg (ap, const char *);
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len = va_arg (ap, size_t);
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comment = va_arg (ap, const char *);
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#endif
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if (len == (size_t) -1)
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len = strlen (str);
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if (flag_debug_asm && comment)
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{
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fputs ("\t.ascii \"", asm_out_file);
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for (i = 0; i < len; i++)
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{
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int c = str[i];
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if (c == '\"' || c == '\\')
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fputc ('\\', asm_out_file);
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if (ISPRINT(c))
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fputc (c, asm_out_file);
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else
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fprintf (asm_out_file, "\\%o", c);
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}
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fprintf (asm_out_file, "\\0\"\t%s ", ASM_COMMENT_START);
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vfprintf (asm_out_file, comment, ap);
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fputc ('\n', asm_out_file);
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}
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else
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{
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/* If an explicit length was given, we can't assume there
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is a null termination in the string buffer. */
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if (orig_len == (size_t) -1)
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len += 1;
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ASM_OUTPUT_ASCII (asm_out_file, str, len);
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if (orig_len != (size_t) -1)
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fprintf (asm_out_file, "%s0\n", ASM_BYTE_OP);
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}
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va_end (ap);
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}
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/* Return the size of an unsigned LEB128 quantity. */
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int
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size_of_uleb128 (value)
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unsigned HOST_WIDE_INT value;
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{
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int size = 0, byte;
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do
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{
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byte = (value & 0x7f);
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value >>= 7;
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size += 1;
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}
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while (value != 0);
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return size;
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}
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/* Return the size of a signed LEB128 quantity. */
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int
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size_of_sleb128 (value)
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HOST_WIDE_INT value;
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{
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int size = 0, byte;
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do
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{
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byte = (value & 0x7f);
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value >>= 7;
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size += 1;
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}
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while (!((value == 0 && (byte & 0x40) == 0)
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|| (value == -1 && (byte & 0x40) != 0)));
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return size;
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}
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/* Output an unsigned LEB128 quantity. */
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void
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dw2_asm_output_data_uleb128 VPARAMS ((unsigned HOST_WIDE_INT value,
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const char *comment, ...))
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{
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#ifndef ANSI_PROTOTYPES
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unsigned HOST_WIDE_INT value;
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const char *comment;
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#endif
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va_list ap;
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VA_START (ap, comment);
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#ifndef ANSI_PROTOTYPES
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value = va_arg (ap, unsigned HOST_WIDE_INT);
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comment = va_arg (ap, const char *);
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#endif
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#ifdef HAVE_AS_LEB128
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fputs ("\t.uleb128 ", asm_out_file);
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fprintf (asm_out_file, HOST_WIDE_INT_PRINT_HEX, value);
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if (flag_debug_asm && comment)
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{
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fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
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vfprintf (asm_out_file, comment, ap);
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}
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#else
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{
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unsigned HOST_WIDE_INT work = value;
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fputs (ASM_BYTE_OP, asm_out_file);
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do
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{
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int byte = (work & 0x7f);
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work >>= 7;
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if (work != 0)
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/* More bytes to follow. */
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byte |= 0x80;
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fprintf (asm_out_file, "0x%x", byte);
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if (work != 0)
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fputc (',', asm_out_file);
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}
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while (work != 0);
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if (flag_debug_asm)
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{
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fprintf (asm_out_file, "\t%s uleb128 ", ASM_COMMENT_START);
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fprintf (asm_out_file, HOST_WIDE_INT_PRINT_HEX, value);
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if (comment)
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{
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fputs ("; ", asm_out_file);
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vfprintf (asm_out_file, comment, ap);
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}
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}
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}
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#endif
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fputc ('\n', asm_out_file);
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va_end (ap);
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}
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/* Output an signed LEB128 quantity. */
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void
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dw2_asm_output_data_sleb128 VPARAMS ((HOST_WIDE_INT value,
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const char *comment, ...))
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{
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#ifndef ANSI_PROTOTYPES
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HOST_WIDE_INT value;
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const char *comment;
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#endif
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va_list ap;
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VA_START (ap, comment);
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#ifndef ANSI_PROTOTYPES
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value = va_arg (ap, HOST_WIDE_INT);
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comment = va_arg (ap, const char *);
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#endif
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#ifdef HAVE_AS_LEB128
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fputs ("\t.sleb128 ", asm_out_file);
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fprintf (asm_out_file, HOST_WIDE_INT_PRINT_DEC, value);
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if (flag_debug_asm && comment)
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{
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fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
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vfprintf (asm_out_file, comment, ap);
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}
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#else
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{
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HOST_WIDE_INT work = value;
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int more, byte;
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fputs (ASM_BYTE_OP, asm_out_file);
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do
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{
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byte = (work & 0x7f);
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/* arithmetic shift */
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work >>= 7;
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more = !((work == 0 && (byte & 0x40) == 0)
|
||
|| (work == -1 && (byte & 0x40) != 0));
|
||
if (more)
|
||
byte |= 0x80;
|
||
|
||
fprintf (asm_out_file, "0x%x", byte);
|
||
if (more)
|
||
fputc (',', asm_out_file);
|
||
}
|
||
while (more);
|
||
|
||
if (flag_debug_asm)
|
||
{
|
||
fprintf (asm_out_file, "\t%s sleb128 ", ASM_COMMENT_START);
|
||
fprintf (asm_out_file, HOST_WIDE_INT_PRINT_DEC, value);
|
||
if (comment)
|
||
{
|
||
fputs ("; ", asm_out_file);
|
||
vfprintf (asm_out_file, comment, ap);
|
||
}
|
||
}
|
||
}
|
||
#endif
|
||
fputc ('\n', asm_out_file);
|
||
|
||
va_end (ap);
|
||
}
|
||
|
||
void
|
||
dw2_asm_output_delta_uleb128 VPARAMS ((const char *lab1 ATTRIBUTE_UNUSED,
|
||
const char *lab2 ATTRIBUTE_UNUSED,
|
||
const char *comment, ...))
|
||
{
|
||
#ifndef ANSI_PROTOTYPES
|
||
const char *lab1, *lab2;
|
||
const char *comment;
|
||
#endif
|
||
va_list ap;
|
||
|
||
VA_START (ap, comment);
|
||
|
||
#ifndef ANSI_PROTOTYPES
|
||
lab1 = va_arg (ap, const char *);
|
||
lab2 = va_arg (ap, const char *);
|
||
comment = va_arg (ap, const char *);
|
||
#endif
|
||
|
||
#ifdef HAVE_AS_LEB128
|
||
fputs ("\t.uleb128 ", asm_out_file);
|
||
assemble_name (asm_out_file, lab1);
|
||
fputc ('-', asm_out_file);
|
||
assemble_name (asm_out_file, lab2);
|
||
#else
|
||
abort ();
|
||
#endif
|
||
|
||
if (flag_debug_asm && comment)
|
||
{
|
||
fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
|
||
vfprintf (asm_out_file, comment, ap);
|
||
}
|
||
fputc ('\n', asm_out_file);
|
||
|
||
va_end (ap);
|
||
}
|
||
|
||
void
|
||
dw2_asm_output_delta_sleb128 VPARAMS ((const char *lab1 ATTRIBUTE_UNUSED,
|
||
const char *lab2 ATTRIBUTE_UNUSED,
|
||
const char *comment, ...))
|
||
{
|
||
#ifndef ANSI_PROTOTYPES
|
||
const char *lab1, *lab2;
|
||
const char *comment;
|
||
#endif
|
||
va_list ap;
|
||
|
||
VA_START (ap, comment);
|
||
|
||
#ifndef ANSI_PROTOTYPES
|
||
lab1 = va_arg (ap, const char *);
|
||
lab2 = va_arg (ap, const char *);
|
||
comment = va_arg (ap, const char *);
|
||
#endif
|
||
|
||
#ifdef HAVE_AS_LEB128
|
||
fputs ("\t.sleb128 ", asm_out_file);
|
||
assemble_name (asm_out_file, lab1);
|
||
fputc ('-', asm_out_file);
|
||
assemble_name (asm_out_file, lab2);
|
||
#else
|
||
abort ();
|
||
#endif
|
||
|
||
if (flag_debug_asm && comment)
|
||
{
|
||
fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
|
||
vfprintf (asm_out_file, comment, ap);
|
||
}
|
||
fputc ('\n', asm_out_file);
|
||
|
||
va_end (ap);
|
||
}
|