--- gcc/config/svr4.h 2018/04/24 17:55:17 1.1.1.2 +++ gcc/config/svr4.h 2018/04/24 18:27:35 1.1.1.8 @@ -1,8 +1,7 @@ -/* svr4.h -- operating system specific defines to be used when - targeting GCC for some generic System V Release 4 system. - Copyright (C) 1991 Free Software Foundation, Inc. - - Written by Ron Guilmette (rfg@ncd.com). +/* Operating system specific defines to be used when targeting GCC for some + generic System V Release 4 system. + Copyright (C) 1991, 1994, 1995 Free Software Foundation, Inc. + Contributed by Ron Guilmette (rfg@segfault.us.com). This file is part of GNU CC. @@ -18,7 +17,8 @@ GNU General Public License for more deta You should have received a copy of the GNU General Public License along with GNU CC; see the file COPYING. If not, write to -the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. +the Free Software Foundation, 59 Temple Place - Suite 330, +Boston, MA 02111-1307, USA. To use this file, make up a file with a name like: @@ -39,11 +39,8 @@ the Free Software Foundation, 675 Mass A appropriate define for the type of hardware that you are targeting. */ -/* Define a symbol so that libgcc* can know what sort of operating - environment and assembler syntax we are targeting for. */ -#ifndef SVR4 -#define SVR4 -#endif +/* Define a symbol indicating that we are using svr4.h. */ +#define USING_SVR4_H /* For the sake of libgcc2.c, indicate target supports atexit. */ #define HAVE_ATEXIT @@ -72,8 +69,9 @@ the Free Software Foundation, 675 Mass A there are no such switches except those implemented by GCC itself. */ #define WORD_SWITCH_TAKES_ARG(STR) \ - (!strcmp (STR, "include") || !strcmp (STR, "imacros") \ - || !strcmp (STR, "aux-info")) + (DEFAULT_WORD_SWITCH_TAKES_ARG (STR) \ + && strcmp (STR, "Tdata") && strcmp (STR, "Ttext") \ + && strcmp (STR, "Tbss")) /* You should redefine CPP_PREDEFINES in any file which includes this one. The definition should be appropriate for the type of target system @@ -112,6 +110,12 @@ the Free Software Foundation, 675 Mass A #undef ASM_FINAL_SPEC #define ASM_FINAL_SPEC "%{pipe:-}" +/* Under svr4, the normal location of the `ld' and `as' programs is the + /usr/ccs/bin directory. */ + +#undef MD_EXEC_PREFIX +#define MD_EXEC_PREFIX "/usr/ccs/bin/" + /* Under svr4, the normal location of the various *crt*.o files is the /usr/ccs/lib directory. */ @@ -119,17 +123,25 @@ the Free Software Foundation, 675 Mass A #define MD_STARTFILE_PREFIX "/usr/ccs/lib/" /* Provide a LIB_SPEC appropriate for svr4. Here we tack on the default - standard C library (unless we are building a shared library) followed by - our own magical crtend.o file (see crtstuff.c) which provides part of - the support for getting C++ file-scope static object constructed before + standard C library (unless we are building a shared library). */ + +#undef LIB_SPEC +#define LIB_SPEC "%{!shared:%{!symbolic:-lc}}" + +/* Provide a LIBGCC_SPEC appropriate for svr4. We also want to exclude + libgcc when -symbolic. */ + +#undef LIBGCC_SPEC +#define LIBGCC_SPEC "%{!shared:%{!symbolic:-lgcc}}" + +/* Provide an ENDFILE_SPEC appropriate for svr4. Here we tack on our own + magical crtend.o file (see crtstuff.c) which provides part of the + support for getting C++ file-scope static object constructed before entering `main', followed by the normal svr3/svr4 "finalizer" file, which is either `gcrtn.o' or `crtn.o'. */ -#undef LIB_SPEC -#define LIB_SPEC \ - "%{!shared:%{!symbolic:-lc}} \ - crtend.o%s \ - %{!shared:%{!symbolic:%{pg:gcrtn.o}%{!pg:crtn.o%s}}}" +#undef ENDFILE_SPEC +#define ENDFILE_SPEC "crtend.o%s %{pg:gcrtn.o}%{!pg:crtn.o%s}" /* Provide a LINK_SPEC appropriate for svr4. Here we provide support for the special GCC options -static, -shared, and -symbolic which @@ -158,8 +170,8 @@ the Free Software Foundation, 675 Mass A #define LINK_SPEC "%{h*} %{V} %{v:%{!V:-V}} \ %{b} %{Wl,*:%*} \ %{static:-dn -Bstatic} \ - %{shared:-G -dy} \ - %{symbolic:-Bsymbolic -G -dy} \ + %{shared:-G -dy -z text %{!h*:%{o*:-h %*}}} \ + %{symbolic:-Bsymbolic -G -dy -z text %{!h*:%{o*:-h %*}}} \ %{G:-G} \ %{YP,*} \ %{!YP,*:%{p:-Y P,/usr/ccs/lib/libp:/usr/lib/libp:/usr/ccs/lib:/usr/lib} \ @@ -181,22 +193,25 @@ the Free Software Foundation, 675 Mass A #undef STARTFILE_SPEC #define STARTFILE_SPEC "%{!shared: \ %{!symbolic: \ - %{pg:gcrt1.o%s}%{!pg:%{p:mcrt1.o%s}%{!p:crt1.o%s}} \ - %{pg:gcrti.o%s}%{!pg:crti.o%s} \ - %{ansi:values-Xc.o%s} \ - %{!ansi: \ - %{traditional:values-Xt.o%s} \ - %{!traditional:values-Xa.o%s}}}} crtbegin.o%s" + %{pg:gcrt1.o%s}%{!pg:%{p:mcrt1.o%s}%{!p:crt1.o%s}}}}\ + %{pg:gcrti.o%s}%{!pg:crti.o%s} \ + %{ansi:values-Xc.o%s} \ + %{!ansi: \ + %{traditional:values-Xt.o%s} \ + %{!traditional:values-Xa.o%s}} \ + crtbegin.o%s" /* Attach a special .ident directive to the end of the file to identify the version of GCC which compiled this code. The format of the .ident string is patterned after the ones produced by native svr4 C compilers. */ +#define IDENT_ASM_OP ".ident" + #define ASM_FILE_END(FILE) \ do { \ - fprintf ((FILE), "\t.ident\t\"GCC: (GNU) %s\"\n", \ - version_string); \ + fprintf ((FILE), "\t%s\t\"GCC: (GNU) %s\"\n", \ + IDENT_ASM_OP, version_string); \ } while (0) /* Allow #sccs in preprocessor. */ @@ -206,7 +221,7 @@ do { \ /* Output #ident as a .ident. */ #define ASM_OUTPUT_IDENT(FILE, NAME) \ - fprintf (FILE, "\t.ident \"%s\"\n", NAME); + fprintf (FILE, "\t%s\t\"%s\"\n", IDENT_ASM_OP, NAME); /* Use periods rather than dollar signs in special g++ assembler names. */ @@ -220,6 +235,10 @@ do { \ #define TARGET_MEM_FUNCTIONS +/* Handle #pragma weak and #pragma pack. */ + +#define HANDLE_SYSV_PRAGMA + /* System V Release 4 uses DWARF debugging info. */ #define DWARF_DEBUGGING_INFO @@ -235,6 +254,67 @@ do { \ #undef DBX_REGISTER_NUMBER +/* gas on SVR4 supports the use of .stabs. Permit -gstabs to be used + in general, although it will only work when using gas. */ + +#define DBX_DEBUGGING_INFO + +/* Use DWARF debugging info by default. */ + +#ifndef PREFERRED_DEBUGGING_TYPE +#define PREFERRED_DEBUGGING_TYPE DWARF_DEBUG +#endif + +/* Make LBRAC and RBRAC addresses relative to the start of the + function. The native Solaris stabs debugging format works this + way, gdb expects it, and it reduces the number of relocation + entries. */ + +#define DBX_BLOCKS_FUNCTION_RELATIVE 1 + +/* When using stabs, gcc2_compiled must be a stabs entry, not an + ordinary symbol, or gdb won't see it. The stabs entry must be + before the N_SO in order for gdb to find it. */ + +#define ASM_IDENTIFY_GCC(FILE) \ +do \ + { \ + if (write_symbols != DBX_DEBUG) \ + fputs ("gcc2_compiled.:\n", FILE); \ + else \ + fputs ("\t.stabs\t\"gcc2_compiled.\", 0x3c, 0, 0, 0\n", FILE); \ + } \ +while (0) + +/* Like block addresses, stabs line numbers are relative to the + current function. */ + +#define ASM_OUTPUT_SOURCE_LINE(file, line) \ +do \ + { \ + static int sym_lineno = 1; \ + fprintf (file, ".stabn 68,0,%d,.LM%d-", \ + line, sym_lineno); \ + assemble_name (file, \ + XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0));\ + fprintf (file, "\n.LM%d:\n", sym_lineno); \ + sym_lineno += 1; \ + } \ +while (0) + +/* In order for relative line numbers to work, we must output the + stabs entry for the function name first. */ + +#define DBX_FUNCTION_FIRST + +/* Generate a blank trailing N_SO to mark the end of the .o file, since + we can't depend upon the linker to mark .o file boundaries with + embedded stabs. */ + +#define DBX_OUTPUT_MAIN_SOURCE_FILE_END(FILE, FILENAME) \ + fprintf (FILE, \ + "\t.text\n\t.stabs \"\",%d,0,0,.Letext\n.Letext:\n", N_SO) + /* Define the actual types of some ANSI-mandated types. (These definitions should work for most SVR4 systems). */ @@ -250,10 +330,15 @@ do { \ #undef WCHAR_TYPE_SIZE #define WCHAR_TYPE_SIZE BITS_PER_WORD -#define MULTIBYTE_CHARS +/* This causes trouble, because it requires the host machine + to support ANSI C. */ +/* #define MULTIBYTE_CHARS */ #undef ASM_BYTE_OP -#define ASM_BYTE_OP "\t.byte" +#define ASM_BYTE_OP ".byte" + +#undef SET_ASM_OP +#define SET_ASM_OP ".set" /* This is how to begin an assembly language file. Most svr4 assemblers want at least a .file directive to come first, and some want to see a .version @@ -269,8 +354,11 @@ do { \ /* This is how to allocate empty space in some section. The .zero pseudo-op is used for this on most svr4 assemblers. */ +#define SKIP_ASM_OP ".zero" + #undef ASM_OUTPUT_SKIP -#define ASM_OUTPUT_SKIP(FILE,SIZE) fprintf (FILE, "\t.zero\t%u\n", (SIZE)) +#define ASM_OUTPUT_SKIP(FILE,SIZE) \ + fprintf (FILE, "\t%s\t%u\n", SKIP_ASM_OP, (SIZE)) /* This is how to output a reference to a user-level label named NAME. `assemble_name' uses this. @@ -281,6 +369,54 @@ do { \ #undef ASM_OUTPUT_LABELREF #define ASM_OUTPUT_LABELREF(FILE,NAME) fprintf (FILE, "%s", NAME) +/* This is how to output an internal numbered label where + PREFIX is the class of label and NUM is the number within the class. + + For most svr4 systems, the convention is that any symbol which begins + with a period is not put into the linker symbol table by the assembler. */ + +#undef ASM_OUTPUT_INTERNAL_LABEL +#define ASM_OUTPUT_INTERNAL_LABEL(FILE, PREFIX, NUM) \ +do { \ + fprintf (FILE, ".%s%d:\n", PREFIX, NUM); \ +} while (0) + +/* This is how to store into the string LABEL + the symbol_ref name of an internal numbered label where + PREFIX is the class of label and NUM is the number within the class. + This is suitable for output with `assemble_name'. + + For most svr4 systems, the convention is that any symbol which begins + with a period is not put into the linker symbol table by the assembler. */ + +#undef ASM_GENERATE_INTERNAL_LABEL +#define ASM_GENERATE_INTERNAL_LABEL(LABEL, PREFIX, NUM) \ +do { \ + sprintf (LABEL, "*.%s%d", PREFIX, NUM); \ +} while (0) + +/* Output the label which precedes a jumptable. Note that for all svr4 + systems where we actually generate jumptables (which is to say every + svr4 target except i386, where we use casesi instead) we put the jump- + tables into the .rodata section and since other stuff could have been + put into the .rodata section prior to any given jumptable, we have to + make sure that the location counter for the .rodata section gets pro- + perly re-aligned prior to the actual beginning of the jump table. */ + +#define ALIGN_ASM_OP ".align" + +#ifndef ASM_OUTPUT_BEFORE_CASE_LABEL +#define ASM_OUTPUT_BEFORE_CASE_LABEL(FILE,PREFIX,NUM,TABLE) \ + ASM_OUTPUT_ALIGN ((FILE), 2); +#endif + +#undef ASM_OUTPUT_CASE_LABEL +#define ASM_OUTPUT_CASE_LABEL(FILE,PREFIX,NUM,JUMPTABLE) \ + do { \ + ASM_OUTPUT_BEFORE_CASE_LABEL (FILE, PREFIX, NUM, JUMPTABLE) \ + ASM_OUTPUT_INTERNAL_LABEL (FILE, PREFIX, NUM); \ + } while (0) + /* The standard SVR4 assembler seems to require that certain builtin library routines (e.g. .udiv) be explicitly declared as .globl in each assembly file where they are referenced. */ @@ -293,10 +429,12 @@ do { \ the linker seems to want the alignment of data objects to depend on their types. We do exactly that here. */ +#define COMMON_ASM_OP ".comm" + #undef ASM_OUTPUT_ALIGNED_COMMON #define ASM_OUTPUT_ALIGNED_COMMON(FILE, NAME, SIZE, ALIGN) \ do { \ - fputs ("\t.comm\t", (FILE)); \ + fprintf ((FILE), "\t%s\t", COMMON_ASM_OP); \ assemble_name ((FILE), (NAME)); \ fprintf ((FILE), ",%u,%u\n", (SIZE), (ALIGN) / BITS_PER_UNIT); \ } while (0) @@ -306,13 +444,15 @@ do { \ the linker seems to want the alignment of data objects to depend on their types. We do exactly that here. */ -#define BSS_ASM_OP ".bss" +#define LOCAL_ASM_OP ".local" #undef ASM_OUTPUT_ALIGNED_LOCAL #define ASM_OUTPUT_ALIGNED_LOCAL(FILE, NAME, SIZE, ALIGN) \ do { \ - fprintf ((FILE), "\t%s\t%s,%u,%u\n", \ - BSS_ASM_OP, (NAME), (SIZE), (ALIGN) / BITS_PER_UNIT); \ + fprintf ((FILE), "\t%s\t", LOCAL_ASM_OP); \ + assemble_name ((FILE), (NAME)); \ + fprintf ((FILE), "\n"); \ + ASM_OUTPUT_ALIGNED_COMMON (FILE, NAME, SIZE, ALIGN); \ } while (0) /* This is the pseudo-op used to generate a 32-bit word of data with a @@ -339,16 +479,33 @@ do { \ #define USE_CONST_SECTION 1 #define CONST_SECTION_ASM_OP ".section\t.rodata" -#define CTORS_SECTION_ASM_OP ".section\t.ctors,\"a\",@progbits" -#define DTORS_SECTION_ASM_OP ".section\t.dtors,\"a\",@progbits" -/* On svr4, we *do* have support for the .init section, and we can put - stuff in there to be executed before `main'. We let crtstuff.c and - other files know this by defining the following symbol. The definition - says how to change sections to the .init section. This is the same - for all know svr4 assemblers. */ +/* Define the pseudo-ops used to switch to the .ctors and .dtors sections. + + Note that we want to give these sections the SHF_WRITE attribute + because these sections will actually contain data (i.e. tables of + addresses of functions in the current root executable or shared library + file) and, in the case of a shared library, the relocatable addresses + will have to be properly resolved/relocated (and then written into) by + the dynamic linker when it actually attaches the given shared library + to the executing process. (Note that on SVR4, you may wish to use the + `-z text' option to the ELF linker, when building a shared library, as + an additional check that you are doing everything right. But if you do + use the `-z text' option when building a shared library, you will get + errors unless the .ctors and .dtors sections are marked as writable + via the SHF_WRITE attribute.) */ + +#define CTORS_SECTION_ASM_OP ".section\t.ctors,\"aw\"" +#define DTORS_SECTION_ASM_OP ".section\t.dtors,\"aw\"" + +/* On svr4, we *do* have support for the .init and .fini sections, and we + can put stuff in there to be executed before and after `main'. We let + crtstuff.c and other files know this by defining the following symbols. + The definitions say how to change sections to the .init and .fini + sections. This is the same for all known svr4 assemblers. */ #define INIT_SECTION_ASM_OP ".section\t.init" +#define FINI_SECTION_ASM_OP ".section\t.fini" /* A default list of other sections which we might be "in" at any given time. For targets that use additional sections (e.g. .tdesc) you @@ -370,7 +527,7 @@ do { \ #define READONLY_DATA_SECTION() const_section () -extern void text_section(); +extern void text_section (); #define CONST_SECTION_FUNCTION \ void \ @@ -391,7 +548,7 @@ ctors_section () \ { \ if (in_section != in_ctors) \ { \ - fprintf (asm_out_file, CTORS_SECTION_ASM_OP); \ + fprintf (asm_out_file, "%s\n", CTORS_SECTION_ASM_OP); \ in_section = in_ctors; \ } \ } @@ -402,11 +559,22 @@ dtors_section () \ { \ if (in_section != in_dtors) \ { \ - fprintf (asm_out_file, DTORS_SECTION_ASM_OP); \ + fprintf (asm_out_file, "%s\n", DTORS_SECTION_ASM_OP); \ in_section = in_dtors; \ } \ } +/* Switch into a generic section. + This is currently only used to support section attributes. + + We make the section read-only and executable for a function decl, + read-only for a const data decl, and writable for a non-const data decl. */ +#define ASM_OUTPUT_SECTION_NAME(FILE, DECL, NAME) \ + fprintf (FILE, ".section\t%s,\"%s\",@progbits\n", NAME, \ + (DECL) && TREE_CODE (DECL) == FUNCTION_DECL ? "ax" : \ + (DECL) && TREE_READONLY (DECL) ? "a" : "aw") + + /* A C statement (sans semicolon) to output an element in the table of global constructors. */ #define ASM_OUTPUT_CONSTRUCTOR(FILE,NAME) \ @@ -444,7 +612,10 @@ dtors_section () \ else if (TREE_CODE (DECL) == VAR_DECL) \ { \ if ((flag_pic && RELOC) \ - || !TREE_READONLY (DECL) || TREE_SIDE_EFFECTS (DECL)) \ + || !TREE_READONLY (DECL) || TREE_SIDE_EFFECTS (DECL) \ + || !DECL_INITIAL (DECL) \ + || (DECL_INITIAL (DECL) != error_mark_node \ + && !TREE_CONSTANT (DECL_INITIAL (DECL)))) \ data_section (); \ else \ const_section (); \ @@ -471,6 +642,12 @@ dtors_section () \ #define TYPE_ASM_OP ".type" #define SIZE_ASM_OP ".size" +/* This is how we tell the assembler that a symbol is weak. */ + +#define ASM_WEAKEN_LABEL(FILE,NAME) \ + do { fputs ("\t.weak\t", FILE); assemble_name (FILE, NAME); \ + fputc ('\n', FILE); } while (0) + /* The following macro defines the format used to output the second operand of the .type assembler directive. Different svr4 assemblers expect various different forms for this operand. The one given here @@ -479,11 +656,22 @@ dtors_section () \ #define TYPE_OPERAND_FMT "@%s" +/* Write the extra assembler code needed to declare a function's result. + Most svr4 assemblers don't require any special declaration of the + result value, but there are exceptions. */ + +#ifndef ASM_DECLARE_RESULT +#define ASM_DECLARE_RESULT(FILE, RESULT) +#endif + /* These macros generate the special .type and .size directives which are used to set the corresponding fields of the linker symbol table - entries in an ELF object file under SVR4. */ + entries in an ELF object file under SVR4. These macros also output + the starting labels for the relevant functions/objects. */ -/* Write the extra assembler code needed to declare a function properly. */ +/* Write the extra assembler code needed to declare a function properly. + Some svr4 assemblers need to also have something extra said about the + function's return value. We allow for that here. */ #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL) \ do { \ @@ -492,6 +680,7 @@ dtors_section () \ putc (',', FILE); \ fprintf (FILE, TYPE_OPERAND_FMT, "function"); \ putc ('\n', FILE); \ + ASM_DECLARE_RESULT (FILE, DECL_RESULT (DECL)); \ ASM_OUTPUT_LABEL(FILE, NAME); \ } while (0) @@ -504,15 +693,38 @@ dtors_section () \ putc (',', FILE); \ fprintf (FILE, TYPE_OPERAND_FMT, "object"); \ putc ('\n', FILE); \ - if (!flag_inhibit_size_directive) \ + size_directive_output = 0; \ + if (!flag_inhibit_size_directive && DECL_SIZE (DECL)) \ { \ + size_directive_output = 1; \ fprintf (FILE, "\t%s\t ", SIZE_ASM_OP); \ assemble_name (FILE, NAME); \ - fprintf (FILE, ",%d\n", int_size_in_bytes (TREE_TYPE (decl))); \ + fprintf (FILE, ",%d\n", int_size_in_bytes (TREE_TYPE (DECL))); \ } \ ASM_OUTPUT_LABEL(FILE, NAME); \ } while (0) +/* Output the size directive for a decl in rest_of_decl_compilation + in the case where we did not do so before the initializer. + Once we find the error_mark_node, we know that the value of + size_directive_output was set + by ASM_DECLARE_OBJECT_NAME when it was run for the same decl. */ + +#define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP_LEVEL, AT_END) \ +do { \ + char *name = XSTR (XEXP (DECL_RTL (DECL), 0), 0); \ + if (!flag_inhibit_size_directive && DECL_SIZE (DECL) \ + && ! AT_END && TOP_LEVEL \ + && DECL_INITIAL (DECL) == error_mark_node \ + && !size_directive_output) \ + { \ + size_directive_output = 1; \ + fprintf (FILE, "\t%s\t ", SIZE_ASM_OP); \ + assemble_name (FILE, name); \ + fprintf (FILE, ",%d\n", int_size_in_bytes (TREE_TYPE (DECL))); \ + } \ + } while (0) + /* This is how to declare the size of a function. */ #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL) \ @@ -529,7 +741,7 @@ dtors_section () \ fprintf (FILE, ","); \ assemble_name (FILE, label); \ fprintf (FILE, "-"); \ - ASM_OUTPUT_LABELREF (FILE, (FNAME)); \ + assemble_name (FILE, (FNAME)); \ putc ('\n', FILE); \ } \ } while (0) @@ -545,10 +757,11 @@ dtors_section () \ in the table. Note that we can use standard UN*X escape sequences for many control characters, but we don't use \a to represent BEL because some svr4 assemblers (e.g. on - the i386) don't know about that. */ + the i386) don't know about that. Also, we don't use \v + since some versions of gas, such as 2.2 did not accept it. */ #define ESCAPES \ -"\1\1\1\1\1\1\1\1btnvfr\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\ +"\1\1\1\1\1\1\1\1btn\1fr\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\ \0\0\"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\ \0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\\\0\0\0\ \0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\ @@ -669,3 +882,6 @@ dtors_section () \ fprintf ((FILE), "\"\n"); \ } \ while (0) + +/* All SVR4 targets use the ELF object file format. */ +#define OBJECT_FORMAT_ELF