| /* Definitions for SOM assembler support. |
| Copyright (C) 1999, 2001, 2002, 2003 Free Software Foundation, Inc. |
| |
| This file is part of GCC. |
| |
| GCC is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2, or (at your option) |
| any later version. |
| |
| GCC is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GCC; see the file COPYING. If not, write to |
| the Free Software Foundation, 59 Temple Place - Suite 330, |
| Boston, MA 02111-1307, USA. */ |
| |
| /* So we can conditionalize small amounts of code in pa.c or pa.md. */ |
| #undef TARGET_SOM |
| #define TARGET_SOM 1 |
| |
| /* We do not use BINCL stabs in SOM. |
| ??? If it does not hurt, we probably should to avoid useless divergence |
| from other embedded stabs implementations. */ |
| #undef DBX_USE_BINCL |
| |
| /* We make the first line stab special to avoid adding several |
| gross hacks to GAS. */ |
| #undef ASM_OUTPUT_SOURCE_LINE |
| #define ASM_OUTPUT_SOURCE_LINE(file, line, counter) \ |
| { static tree last_function_decl = NULL; \ |
| if (current_function_decl == last_function_decl) \ |
| { \ |
| rtx func = DECL_RTL (current_function_decl); \ |
| const char *name = XSTR (XEXP (func, 0), 0); \ |
| fprintf (file, "\t.stabn 68,0,%d,L$M%d-%s\nL$M%d:\n", \ |
| line, counter, \ |
| (* targetm.strip_name_encoding) (name), \ |
| counter); \ |
| } \ |
| else \ |
| fprintf (file, "\t.stabn 68,0,%d,0\n", line); \ |
| last_function_decl = current_function_decl; \ |
| } |
| |
| /* gdb needs a null N_SO at the end of each file for scattered loading. */ |
| |
| #undef DBX_OUTPUT_MAIN_SOURCE_FILE_END |
| #define DBX_OUTPUT_MAIN_SOURCE_FILE_END(FILE, FILENAME) \ |
| text_section (); \ |
| fputs ("\t.SPACE $TEXT$\n\t.NSUBSPA $CODE$,QUAD=0,ALIGN=8,ACCESS=44,CODE_ONLY\n", FILE); \ |
| fprintf (FILE, \ |
| "\t.stabs \"\",%d,0,0,L$text_end0000\nL$text_end0000:\n", N_SO) |
| |
| /* Select a format to encode pointers in exception handling data. CODE |
| is 0 for data, 1 for code labels, 2 for function pointers. GLOBAL is |
| true if the symbol may be affected by dynamic relocations. Because |
| the HP assembler does auto alignment, it is necessary to use |
| DW_EH_PE_aligned instead of the default DW_EH_PE_absptr. */ |
| |
| #define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL) \ |
| (TARGET_GAS ? DW_EH_PE_absptr : DW_EH_PE_aligned) |
| |
| /* HPUX has a program 'chatr' to list the dependencies of dynamically |
| linked executables and shared libraries. */ |
| #define LDD_SUFFIX "chatr" |
| /* Look for lines like "dynamic /usr/lib/X11R5/libX11.sl" |
| or "static /usr/lib/X11R5/libX11.sl". |
| |
| HPUX 10.20 also has lines like "static branch prediction ..." |
| so we filter that out explicitly. |
| |
| We also try to bound our search for libraries with marker |
| lines. What a pain. */ |
| #define PARSE_LDD_OUTPUT(PTR) \ |
| do { \ |
| static int in_shlib_list = 0; \ |
| while (*PTR == ' ') PTR++; \ |
| if (strncmp (PTR, "shared library list:", \ |
| sizeof ("shared library list:") - 1) == 0) \ |
| { \ |
| PTR = 0; \ |
| in_shlib_list = 1; \ |
| } \ |
| else if (strncmp (PTR, "shared library binding:", \ |
| sizeof ("shared library binding:") - 1) == 0)\ |
| { \ |
| PTR = 0; \ |
| in_shlib_list = 0; \ |
| } \ |
| else if (strncmp (PTR, "static branch prediction disabled", \ |
| sizeof ("static branch prediction disabled") - 1) == 0)\ |
| { \ |
| PTR = 0; \ |
| in_shlib_list = 0; \ |
| } \ |
| else if (in_shlib_list \ |
| && strncmp (PTR, "dynamic", sizeof ("dynamic") - 1) == 0) \ |
| { \ |
| PTR += sizeof ("dynamic") - 1; \ |
| while (*p == ' ') PTR++; \ |
| } \ |
| else if (in_shlib_list \ |
| && strncmp (PTR, "static", sizeof ("static") - 1) == 0) \ |
| { \ |
| PTR += sizeof ("static") - 1; \ |
| while (*p == ' ') PTR++; \ |
| } \ |
| else \ |
| PTR = 0; \ |
| } while (0) |
| |
| /* Output the label for a function definition. */ |
| #ifndef HP_FP_ARG_DESCRIPTOR_REVERSED |
| #define ASM_DOUBLE_ARG_DESCRIPTORS(FILE, ARG0, ARG1) \ |
| do { fprintf (FILE, ",ARGW%d=FR", (ARG0)); \ |
| fprintf (FILE, ",ARGW%d=FU", (ARG1));} while (0) |
| #define DFMODE_RETURN_STRING ",RTNVAL=FU" |
| #define SFMODE_RETURN_STRING ",RTNVAL=FR" |
| #else |
| #define ASM_DOUBLE_ARG_DESCRIPTORS(FILE, ARG0, ARG1) \ |
| do { fprintf (FILE, ",ARGW%d=FU", (ARG0)); \ |
| fprintf (FILE, ",ARGW%d=FR", (ARG1));} while (0) |
| #define DFMODE_RETURN_STRING ",RTNVAL=FR" |
| #define SFMODE_RETURN_STRING ",RTNVAL=FU" |
| #endif |
| |
| |
| /* NAME refers to the function's name. If we are placing each function into |
| its own section, we need to switch to the section for this function. Note |
| that the section name will have a "." prefix. */ |
| #define ASM_OUTPUT_FUNCTION_PREFIX(FILE, NAME) \ |
| { \ |
| const char *name = (*targetm.strip_name_encoding) (NAME); \ |
| if (TARGET_GAS && in_section == in_text) \ |
| fputs ("\t.NSUBSPA $CODE$,QUAD=0,ALIGN=8,ACCESS=44,CODE_ONLY\n", FILE); \ |
| else if (TARGET_GAS) \ |
| fprintf (FILE, \ |
| "\t.SUBSPA .%s\n", name); \ |
| } |
| |
| #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL) \ |
| do { tree fntype = TREE_TYPE (TREE_TYPE (DECL)); \ |
| tree tree_type = TREE_TYPE (DECL); \ |
| tree parm; \ |
| int i; \ |
| if (TREE_PUBLIC (DECL) || TARGET_GAS) \ |
| { \ |
| if (TREE_PUBLIC (DECL)) \ |
| { \ |
| fputs ("\t.EXPORT ", FILE); \ |
| assemble_name (FILE, NAME); \ |
| fputs (",ENTRY,PRIV_LEV=3", FILE); \ |
| } \ |
| else \ |
| { \ |
| fputs ("\t.PARAM ", FILE); \ |
| assemble_name (FILE, NAME); \ |
| fputs (",PRIV_LEV=3", FILE); \ |
| } \ |
| for (parm = DECL_ARGUMENTS (DECL), i = 0; parm && i < 4; \ |
| parm = TREE_CHAIN (parm)) \ |
| { \ |
| if (TYPE_MODE (DECL_ARG_TYPE (parm)) == SFmode \ |
| && ! TARGET_SOFT_FLOAT) \ |
| fprintf (FILE, ",ARGW%d=FR", i++); \ |
| else if (TYPE_MODE (DECL_ARG_TYPE (parm)) == DFmode \ |
| && ! TARGET_SOFT_FLOAT) \ |
| { \ |
| if (i <= 2) \ |
| { \ |
| if (i == 1) i++; \ |
| ASM_DOUBLE_ARG_DESCRIPTORS (FILE, i++, i++); \ |
| } \ |
| else \ |
| break; \ |
| } \ |
| else \ |
| { \ |
| int arg_size = \ |
| FUNCTION_ARG_SIZE (TYPE_MODE (DECL_ARG_TYPE (parm)),\ |
| DECL_ARG_TYPE (parm)); \ |
| /* Passing structs by invisible reference uses \ |
| one general register. */ \ |
| if (arg_size > 2 \ |
| || TREE_ADDRESSABLE (DECL_ARG_TYPE (parm))) \ |
| arg_size = 1; \ |
| if (arg_size == 2 && i <= 2) \ |
| { \ |
| if (i == 1) i++; \ |
| fprintf (FILE, ",ARGW%d=GR", i++); \ |
| fprintf (FILE, ",ARGW%d=GR", i++); \ |
| } \ |
| else if (arg_size == 1) \ |
| fprintf (FILE, ",ARGW%d=GR", i++); \ |
| else \ |
| i += arg_size; \ |
| } \ |
| } \ |
| /* anonymous args */ \ |
| if (TYPE_ARG_TYPES (tree_type) != 0 \ |
| && (TREE_VALUE (tree_last (TYPE_ARG_TYPES (tree_type)))\ |
| != void_type_node)) \ |
| { \ |
| for (; i < 4; i++) \ |
| fprintf (FILE, ",ARGW%d=GR", i); \ |
| } \ |
| if (TYPE_MODE (fntype) == DFmode && ! TARGET_SOFT_FLOAT) \ |
| fputs (DFMODE_RETURN_STRING, FILE); \ |
| else if (TYPE_MODE (fntype) == SFmode && ! TARGET_SOFT_FLOAT) \ |
| fputs (SFMODE_RETURN_STRING, FILE); \ |
| else if (fntype != void_type_node) \ |
| fputs (",RTNVAL=GR", FILE); \ |
| fputs ("\n", FILE); \ |
| }} while (0) |
| |
| #define TARGET_ASM_FILE_START pa_som_file_start |
| |
| /* Output before code. */ |
| |
| /* Supposedly the assembler rejects the command if there is no tab! */ |
| #define TEXT_SECTION_ASM_OP "\t.SPACE $TEXT$\n\t.SUBSPA $CODE$\n" |
| |
| /* Output before read-only data. */ |
| |
| /* Supposedly the assembler rejects the command if there is no tab! */ |
| #define READONLY_DATA_ASM_OP "\t.SPACE $TEXT$\n\t.SUBSPA $LIT$\n" |
| |
| #define EXTRA_SECTIONS in_readonly_data |
| |
| #define EXTRA_SECTION_FUNCTIONS \ |
| extern void readonly_data (void); \ |
| void \ |
| readonly_data (void) \ |
| { \ |
| if (in_section != in_readonly_data) \ |
| { \ |
| in_section = in_readonly_data; \ |
| fprintf (asm_out_file, "%s\n", READONLY_DATA_ASM_OP); \ |
| } \ |
| } |
| |
| /* FIXME: HPUX ld generates incorrect GOT entries for "T" fixups |
| which reference data within the $TEXT$ space (for example constant |
| strings in the $LIT$ subspace). |
| |
| The assemblers (GAS and HP as) both have problems with handling |
| the difference of two symbols which is the other correct way to |
| reference constant data during PIC code generation. |
| |
| So, there's no way to reference constant data which is in the |
| $TEXT$ space during PIC generation. Instead place all constant |
| data into the $PRIVATE$ subspace (this reduces sharing, but it |
| works correctly). */ |
| |
| #define READONLY_DATA_SECTION (flag_pic ? data_section : readonly_data) |
| |
| /* Output before writable data. */ |
| |
| /* Supposedly the assembler rejects the command if there is no tab! */ |
| #define DATA_SECTION_ASM_OP "\t.SPACE $PRIVATE$\n\t.SUBSPA $DATA$\n" |
| |
| /* Output before uninitialized data. */ |
| |
| #define BSS_SECTION_ASM_OP "\t.SPACE $PRIVATE$\n\t.SUBSPA $BSS$\n" |
| |
| /* We must not have a reference to an external symbol defined in a |
| shared library in a readonly section, else the SOM linker will |
| complain. |
| |
| So, we force exception information into the data section. */ |
| #define TARGET_ASM_EXCEPTION_SECTION data_section |
| |
| /* This is how to output a command to make the user-level label named NAME |
| defined for reference from other files. |
| |
| We call assemble_name, which in turn sets TREE_SYMBOL_REFERENCED. This |
| macro will restore the original value of TREE_SYMBOL_REFERENCED to avoid |
| placing useless function definitions in the output file. |
| |
| Also note that the SOM based tools need the symbol imported as a CODE |
| symbol, while the ELF based tools require the symbol to be imported as |
| an ENTRY symbol. What a crock. */ |
| |
| #define ASM_OUTPUT_EXTERNAL(FILE, DECL, NAME) \ |
| do { int save_referenced; \ |
| save_referenced = TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (DECL)); \ |
| fputs ("\t.IMPORT ", FILE); \ |
| assemble_name (FILE, NAME); \ |
| if (FUNCTION_NAME_P (NAME)) \ |
| fputs (",CODE\n", FILE); \ |
| else \ |
| fputs (",DATA\n", FILE); \ |
| TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (DECL)) = save_referenced; \ |
| } while (0) |
| |
| /* The bogus HP assembler requires ALL external references to be |
| "imported", even library calls. They look a bit different, so |
| here's this macro. |
| |
| Also note not all libcall names are passed to pa_encode_section_info |
| (__main for example). To make sure all libcall names have section |
| info recorded in them, we do it here. We must also ensure that |
| we don't import a libcall that has been previously exported since |
| the HP assembler may change an ENTRY symbol to a CODE symbol. */ |
| |
| #define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, RTL) \ |
| do { const char *name; \ |
| tree id; \ |
| \ |
| if (!function_label_operand (RTL, VOIDmode)) \ |
| hppa_encode_label (RTL); \ |
| \ |
| name = (*targetm.strip_name_encoding) (XSTR ((RTL), 0)); \ |
| id = maybe_get_identifier (name); \ |
| if (! id || ! TREE_SYMBOL_REFERENCED (id)) \ |
| { \ |
| fputs ("\t.IMPORT ", FILE); \ |
| assemble_name (FILE, XSTR ((RTL), 0)); \ |
| fputs (",CODE\n", FILE); \ |
| } \ |
| } while (0) |
| |
| /* We want __gcc_plt_call to appear in every program built by |
| gcc, so we make a reference to it out of __main. |
| We use the asm statement to fool the optimizer into not |
| removing the dead (but important) initialization of |
| REFERENCE. */ |
| |
| #define DO_GLOBAL_DTORS_BODY \ |
| do { \ |
| extern void __gcc_plt_call (void); \ |
| void (*reference)(void) = &__gcc_plt_call; \ |
| func_ptr *p; \ |
| __asm__ ("" : : "r" (reference)); \ |
| for (p = __DTOR_LIST__ + 1; *p; ) \ |
| (*p++) (); \ |
| } while (0) |
| |
| /* The .align directive in the HP assembler allows up to a 32 alignment. */ |
| #define MAX_OFILE_ALIGNMENT 32768 |
| |
| /* The SOM linker hardcodes paths into binaries. As a result, dotdots |
| must be removed from library prefixes to prevent binaries from depending |
| on the location of the GCC tool directory. The downside is GCC |
| cannot be moved after installation using a symlink. */ |
| #define ALWAYS_STRIP_DOTDOT 1 |
| |
| /* Aggregates with a single float or double field should be passed and |
| returned in the general registers. */ |
| #define MEMBER_TYPE_FORCES_BLK(FIELD, MODE) (MODE==SFmode || MODE==DFmode) |
| |
| /* If GAS supports weak, we can support weak when we have working linker |
| support for secondary definitions and are generating code for GAS. */ |
| #ifdef HAVE_GAS_WEAK |
| #define SUPPORTS_WEAK (TARGET_SOM_SDEF && TARGET_GAS) |
| #else |
| #define SUPPORTS_WEAK 0 |
| #endif |
| |
| /* We can support one only if we support weak. */ |
| #define SUPPORTS_ONE_ONLY SUPPORTS_WEAK |
| |
| /* Use weak (secondary definitions) to make one only declarations. */ |
| #define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1) |
| |
| /* This is how we tell the assembler that a symbol is weak. The SOM |
| weak implementation uses the secondary definition (sdef) flag. |
| |
| The behavior of sdef symbols is similar to ELF weak symbols in that |
| multiple definitions can occur without incurring a link error. |
| However, they differ in the following ways: |
| 1) Undefined sdef symbols are not allowed. |
| 2) The linker searches for undefined sdef symbols and will load an |
| archive library member to resolve an undefined sdef symbol. |
| 3) The exported symbol from a shared library is a primary symbol |
| rather than a sdef symbol. Thus, more care is needed in the |
| ordering of libraries. |
| |
| It appears that the linker discards extra copies of "weak" functions |
| when linking shared libraries, independent of whether or not they |
| are in their own section. In linking final executables, -Wl,-O can |
| be used to remove dead procedures. Thus, support for named sections |
| is not needed and in previous testing caused problems with various |
| HP tools. */ |
| #define ASM_WEAKEN_LABEL(FILE,NAME) \ |
| do { fputs ("\t.weak\t", FILE); \ |
| assemble_name (FILE, NAME); \ |
| fputc ('\n', FILE); \ |
| if (! FUNCTION_NAME_P (NAME)) \ |
| { \ |
| fputs ("\t.EXPORT ", FILE); \ |
| assemble_name (FILE, NAME); \ |
| fputs (",DATA\n", FILE); \ |
| } \ |
| } while (0) |
| |
| /* We can't handle weak aliases, and therefore can't support pragma weak. |
| Suppress the use of pragma weak in gthr-dce.h and gthr-posix.h. */ |
| #define GTHREAD_USE_WEAK 0 |
