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jlechner |
/* Definitions for SOM assembler support.
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Copyright (C) 1999, 2001, 2002, 2003, 2004, 2005 Free Software Foundation,
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Inc.
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This file is part of GCC.
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GCC 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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GCC 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 GCC; see the file COPYING. If not, write to
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the Free Software Foundation, 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA. */
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/* So we can conditionalize small amounts of code in pa.c or pa.md. */
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#undef TARGET_SOM
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#define TARGET_SOM 1
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/* We do not use BINCL stabs in SOM.
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??? If it does not hurt, we probably should to avoid useless divergence
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from other embedded stabs implementations. */
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#undef DBX_USE_BINCL
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#define DBX_LINES_FUNCTION_RELATIVE 1
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/* gdb needs a null N_SO at the end of each file for scattered loading. */
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#define DBX_OUTPUT_NULL_N_SO_AT_MAIN_SOURCE_FILE_END
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/* HPUX has a program 'chatr' to list the dependencies of dynamically
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linked executables and shared libraries. */
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#define LDD_SUFFIX "chatr"
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/* Look for lines like "dynamic /usr/lib/X11R5/libX11.sl"
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or "static /usr/lib/X11R5/libX11.sl".
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HPUX 10.20 also has lines like "static branch prediction ..."
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so we filter that out explicitly.
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We also try to bound our search for libraries with marker
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lines. What a pain. */
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#define PARSE_LDD_OUTPUT(PTR) \
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do { \
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static int in_shlib_list = 0; \
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while (*PTR == ' ') PTR++; \
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if (strncmp (PTR, "shared library list:", \
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sizeof ("shared library list:") - 1) == 0) \
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{ \
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PTR = 0; \
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in_shlib_list = 1; \
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} \
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else if (strncmp (PTR, "shared library binding:", \
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sizeof ("shared library binding:") - 1) == 0)\
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{ \
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PTR = 0; \
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in_shlib_list = 0; \
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} \
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else if (strncmp (PTR, "static branch prediction disabled", \
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sizeof ("static branch prediction disabled") - 1) == 0)\
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{ \
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PTR = 0; \
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in_shlib_list = 0; \
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} \
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else if (in_shlib_list \
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&& strncmp (PTR, "dynamic", sizeof ("dynamic") - 1) == 0) \
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{ \
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PTR += sizeof ("dynamic") - 1; \
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while (*p == ' ') PTR++; \
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} \
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else if (in_shlib_list \
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&& strncmp (PTR, "static", sizeof ("static") - 1) == 0) \
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{ \
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PTR += sizeof ("static") - 1; \
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while (*p == ' ') PTR++; \
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} \
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else \
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PTR = 0; \
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} while (0)
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/* Output the label for a function definition. */
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#ifndef HP_FP_ARG_DESCRIPTOR_REVERSED
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#define ASM_DOUBLE_ARG_DESCRIPTORS(FILE, ARG0, ARG1) \
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do { fprintf (FILE, ",ARGW%d=FR", (ARG0)); \
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fprintf (FILE, ",ARGW%d=FU", (ARG1));} while (0)
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#define DFMODE_RETURN_STRING ",RTNVAL=FU"
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#define SFMODE_RETURN_STRING ",RTNVAL=FR"
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#else
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#define ASM_DOUBLE_ARG_DESCRIPTORS(FILE, ARG0, ARG1) \
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do { fprintf (FILE, ",ARGW%d=FU", (ARG0)); \
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fprintf (FILE, ",ARGW%d=FR", (ARG1));} while (0)
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#define DFMODE_RETURN_STRING ",RTNVAL=FR"
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#define SFMODE_RETURN_STRING ",RTNVAL=FU"
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#endif
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#define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL) \
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do { tree fntype = TREE_TYPE (TREE_TYPE (DECL)); \
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tree tree_type = TREE_TYPE (DECL); \
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tree parm; \
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int i; \
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if (TREE_PUBLIC (DECL) || TARGET_GAS) \
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{ \
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if (TREE_PUBLIC (DECL)) \
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{ \
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fputs ("\t.EXPORT ", FILE); \
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assemble_name (FILE, NAME); \
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fputs (",ENTRY,PRIV_LEV=3", FILE); \
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} \
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else \
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{ \
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fputs ("\t.PARAM ", FILE); \
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assemble_name (FILE, NAME); \
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fputs (",PRIV_LEV=3", FILE); \
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} \
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for (parm = DECL_ARGUMENTS (DECL), i = 0; parm && i < 4; \
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parm = TREE_CHAIN (parm)) \
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{ \
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if (TYPE_MODE (DECL_ARG_TYPE (parm)) == SFmode \
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&& ! TARGET_SOFT_FLOAT) \
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fprintf (FILE, ",ARGW%d=FR", i++); \
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else if (TYPE_MODE (DECL_ARG_TYPE (parm)) == DFmode \
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&& ! TARGET_SOFT_FLOAT) \
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{ \
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if (i <= 2) \
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{ \
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if (i == 1) i++; \
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ASM_DOUBLE_ARG_DESCRIPTORS (FILE, i++, i++); \
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} \
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else \
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break; \
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} \
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else \
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{ \
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int arg_size = \
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FUNCTION_ARG_SIZE (TYPE_MODE (DECL_ARG_TYPE (parm)),\
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DECL_ARG_TYPE (parm)); \
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/* Passing structs by invisible reference uses \
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one general register. */ \
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if (arg_size > 2 \
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|| TREE_ADDRESSABLE (DECL_ARG_TYPE (parm))) \
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arg_size = 1; \
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if (arg_size == 2 && i <= 2) \
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{ \
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if (i == 1) i++; \
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fprintf (FILE, ",ARGW%d=GR", i++); \
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fprintf (FILE, ",ARGW%d=GR", i++); \
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} \
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else if (arg_size == 1) \
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fprintf (FILE, ",ARGW%d=GR", i++); \
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else \
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i += arg_size; \
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} \
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} \
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/* anonymous args */ \
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if (TYPE_ARG_TYPES (tree_type) != 0 \
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&& (TREE_VALUE (tree_last (TYPE_ARG_TYPES (tree_type)))\
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!= void_type_node)) \
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{ \
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for (; i < 4; i++) \
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fprintf (FILE, ",ARGW%d=GR", i); \
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} \
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if (TYPE_MODE (fntype) == DFmode && ! TARGET_SOFT_FLOAT) \
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fputs (DFMODE_RETURN_STRING, FILE); \
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else if (TYPE_MODE (fntype) == SFmode && ! TARGET_SOFT_FLOAT) \
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fputs (SFMODE_RETURN_STRING, FILE); \
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else if (fntype != void_type_node) \
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fputs (",RTNVAL=GR", FILE); \
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fputs ("\n", FILE); \
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}} while (0)
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#define TARGET_ASM_FILE_START pa_som_file_start
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/* String to output before text. */
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#define TEXT_SECTION_ASM_OP som_text_section_asm_op ()
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/* String to output before writable data. */
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#define DATA_SECTION_ASM_OP "\t.SPACE $PRIVATE$\n\t.SUBSPA $DATA$\n"
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/* String to output before uninitialized data. */
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#define BSS_SECTION_ASM_OP "\t.SPACE $PRIVATE$\n\t.SUBSPA $BSS$\n"
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/* FIXME: HPUX ld generates incorrect GOT entries for "T" fixups
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which reference data within the $TEXT$ space (for example constant
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strings in the $LIT$ subspace).
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The assemblers (GAS and HP as) both have problems with handling
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the difference of two symbols which is the other correct way to
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reference constant data during PIC code generation.
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So, there's no way to reference constant data which is in the
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$TEXT$ space during PIC generation. Instead place all constant
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data into the $PRIVATE$ subspace (this reduces sharing, but it
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works correctly). */
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#define READONLY_DATA_SECTION \
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(flag_pic ? data_section : som_readonly_data_section)
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/* We must not have a reference to an external symbol defined in a
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shared library in a readonly section, else the SOM linker will
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complain.
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So, we force exception information into the data section. */
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#define TARGET_ASM_EXCEPTION_SECTION data_section
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/* This is how to output a command to make the user-level label
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named NAME defined for reference from other files. We use
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assemble_name_raw instead of assemble_name since a symbol in
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a .IMPORT directive that isn't otherwise referenced is not
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placed in the symbol table of the assembled object.
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Failure to import a function reference can cause the HP linker
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to segmentation fault!
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Note that the SOM based tools need the symbol imported as a
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CODE symbol, while the ELF based tools require the symbol to
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be imported as an ENTRY symbol. */
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#define ASM_OUTPUT_EXTERNAL(FILE, DECL, NAME) \
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pa_hpux_asm_output_external ((FILE), (DECL), (NAME))
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#define ASM_OUTPUT_EXTERNAL_REAL(FILE, DECL, NAME) \
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do { fputs ("\t.IMPORT ", FILE); \
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assemble_name_raw (FILE, NAME); \
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if (FUNCTION_NAME_P (NAME)) \
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fputs (",CODE\n", FILE); \
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else \
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fputs (",DATA\n", FILE); \
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} while (0)
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/* The bogus HP assembler requires ALL external references to be
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"imported", even library calls. They look a bit different, so
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here's this macro.
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Also note not all libcall names are passed to pa_encode_section_info
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(__main for example). To make sure all libcall names have section
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info recorded in them, we do it here.
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We must also ensure that a libcall that has been previously
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exported is not subsequently imported since the HP assembler may
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change the type from an ENTRY to a CODE symbol. This would make
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the symbol local. We are forced to use the identifier node
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associated with the real assembler name for this check as the
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symbol_ref available in ASM_DECLARE_FUNCTION_NAME is not the
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same as the one used here. As a result, we can't use flags
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in the symbol_ref for this check. The identifier check assumes
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assemble_external_libcall is called before the symbol is used. */
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#define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, RTL) \
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do { const char *name; \
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tree id; \
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\
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| 256 |
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if (!function_label_operand (RTL, VOIDmode)) \
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hppa_encode_label (RTL); \
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\
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name = targetm.strip_name_encoding (XSTR ((RTL), 0)); \
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| 260 |
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id = maybe_get_identifier (name); \
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| 261 |
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if (!id || !TREE_SYMBOL_REFERENCED (id)) \
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{ \
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| 263 |
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fputs ("\t.IMPORT ", FILE); \
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assemble_name_raw (FILE, XSTR ((RTL), 0)); \
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fputs (",CODE\n", FILE); \
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| 266 |
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} \
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| 267 |
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} while (0)
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| 268 |
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| 269 |
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/* We want __gcc_plt_call to appear in every program built by
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gcc, so we make a reference to it out of __main.
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We use the asm statement to fool the optimizer into not
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removing the dead (but important) initialization of
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| 273 |
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REFERENCE. */
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| 274 |
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| 275 |
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#define DO_GLOBAL_DTORS_BODY \
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| 276 |
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do { \
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| 277 |
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extern void __gcc_plt_call (void); \
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| 278 |
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void (*reference)(void) = &__gcc_plt_call; \
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| 279 |
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func_ptr *p; \
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__asm__ ("" : : "r" (reference)); \
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| 281 |
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for (p = __DTOR_LIST__ + 1; *p; ) \
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(*p++) (); \
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| 283 |
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} while (0)
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| 284 |
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| 285 |
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/* This macro specifies the biggest alignment supported by the object
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file format of this machine.
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| 287 |
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The .align directive in the HP assembler allows alignments up to 4096
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| 289 |
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bytes. However, the maximum alignment of a global common symbol is 8
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bytes for objects smaller than the page size (4096 bytes). For larger
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| 291 |
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objects, the linker provides an alignment of 32 bytes. Unfortunately,
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| 292 |
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this macro doesn't provide a mechanism to test for common symbols. */
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| 293 |
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#define MAX_OFILE_ALIGNMENT 32768
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| 294 |
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| 295 |
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/* The SOM linker hardcodes paths into binaries. As a result, dotdots
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must be removed from library prefixes to prevent binaries from depending
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on the location of the GCC tool directory. The downside is GCC
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| 298 |
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cannot be moved after installation using a symlink. */
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| 299 |
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#define ALWAYS_STRIP_DOTDOT 1
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| 300 |
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| 301 |
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/* If GAS supports weak, we can support weak when we have working linker
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support for secondary definitions and are generating code for GAS. */
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| 303 |
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#ifdef HAVE_GAS_WEAK
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| 304 |
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#define SUPPORTS_WEAK (TARGET_SOM_SDEF && TARGET_GAS)
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#else
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| 306 |
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#define SUPPORTS_WEAK 0
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| 307 |
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#endif
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| 308 |
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| 309 |
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/* CVS GAS as of 4/28/04 supports a comdat parameter for the .nsubspa
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| 310 |
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directive. This provides one-only linkage semantics even though we
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| 311 |
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don't have weak support. */
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| 312 |
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#ifdef HAVE_GAS_NSUBSPA_COMDAT
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| 313 |
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#define SUPPORTS_SOM_COMDAT (TARGET_GAS)
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#else
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| 315 |
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#define SUPPORTS_SOM_COMDAT 0
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| 316 |
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#endif
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| 317 |
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| 318 |
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/* We can support one only if we support weak or comdat. */
|
| 319 |
|
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#define SUPPORTS_ONE_ONLY (SUPPORTS_WEAK || SUPPORTS_SOM_COMDAT)
|
| 320 |
|
|
|
| 321 |
|
|
/* We use DECL_COMMON for uninitialized one-only variables as we don't
|
| 322 |
|
|
have linkonce .bss. We use SOM secondary definitions or comdat for
|
| 323 |
|
|
initialized variables and functions. */
|
| 324 |
|
|
#define MAKE_DECL_ONE_ONLY(DECL) \
|
| 325 |
|
|
do { \
|
| 326 |
|
|
if (TREE_CODE (DECL) == VAR_DECL \
|
| 327 |
|
|
&& (DECL_INITIAL (DECL) == 0 \
|
| 328 |
|
|
|| DECL_INITIAL (DECL) == error_mark_node)) \
|
| 329 |
|
|
DECL_COMMON (DECL) = 1; \
|
| 330 |
|
|
else if (SUPPORTS_WEAK) \
|
| 331 |
|
|
DECL_WEAK (DECL) = 1; \
|
| 332 |
|
|
} while (0)
|
| 333 |
|
|
|
| 334 |
|
|
/* This is how we tell the assembler that a symbol is weak. The SOM
|
| 335 |
|
|
weak implementation uses the secondary definition (sdef) flag.
|
| 336 |
|
|
|
| 337 |
|
|
The behavior of sdef symbols is similar to ELF weak symbols in that
|
| 338 |
|
|
multiple definitions can occur without incurring a link error.
|
| 339 |
|
|
However, they differ in the following ways:
|
| 340 |
|
|
1) Undefined sdef symbols are not allowed.
|
| 341 |
|
|
2) The linker searches for undefined sdef symbols and will load an
|
| 342 |
|
|
archive library member to resolve an undefined sdef symbol.
|
| 343 |
|
|
3) The exported symbol from a shared library is a primary symbol
|
| 344 |
|
|
rather than a sdef symbol. Thus, more care is needed in the
|
| 345 |
|
|
ordering of libraries.
|
| 346 |
|
|
|
| 347 |
|
|
It appears that the linker discards extra copies of "weak" functions
|
| 348 |
|
|
when linking shared libraries, independent of whether or not they
|
| 349 |
|
|
are in their own section. In linking final executables, -Wl,-O can
|
| 350 |
|
|
be used to remove dead procedures. Thus, support for named sections
|
| 351 |
|
|
is not needed and in previous testing caused problems with various
|
| 352 |
|
|
HP tools. */
|
| 353 |
|
|
#define ASM_WEAKEN_LABEL(FILE,NAME) \
|
| 354 |
|
|
do { fputs ("\t.weak\t", FILE); \
|
| 355 |
|
|
assemble_name (FILE, NAME); \
|
| 356 |
|
|
fputc ('\n', FILE); \
|
| 357 |
|
|
targetm.asm_out.globalize_label (FILE, NAME); \
|
| 358 |
|
|
} while (0)
|
| 359 |
|
|
|
| 360 |
|
|
/* We can't handle weak aliases, and therefore can't support pragma weak.
|
| 361 |
|
|
Suppress the use of pragma weak in gthr-dce.h and gthr-posix.h. */
|
| 362 |
|
|
#define GTHREAD_USE_WEAK 0
|
