--- gcc/config/svr4.h 2018/04/24 18:06:14 1.1.1.4 +++ gcc/config/svr4.h 2018/04/24 18:33:34 1.1.1.9 @@ -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: @@ -69,8 +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 @@ -122,17 +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 @@ -161,8 +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} \ @@ -184,12 +193,13 @@ 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 @@ -244,6 +254,75 @@ 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. Furthermore, since gdb reads + the input piecemeal, starting with each N_SO, it's a lot easier if + the gcc2 flag symbol is *after* the N_SO rather than before it. So + we emit an N_OPT stab there. */ + +#define ASM_IDENTIFY_GCC(FILE) \ +do \ + { \ + if (write_symbols != DBX_DEBUG) \ + fputs ("gcc2_compiled.:\n", FILE); \ + } \ +while (0) + +#define ASM_IDENTIFY_GCC_AFTER_SOURCE(FILE) \ +do \ + { \ + if (write_symbols == DBX_DEBUG) \ + 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). */ @@ -324,7 +403,7 @@ do { \ sprintf (LABEL, "*.%s%d", PREFIX, NUM); \ } while (0) -/* Output the label which preceeds a jumptable. Note that for all svr4 +/* 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 @@ -408,16 +487,33 @@ 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 @@ -439,7 +535,7 @@ do { \ #define READONLY_DATA_SECTION() const_section () -extern void text_section(); +extern void text_section (); #define CONST_SECTION_FUNCTION \ void \ @@ -476,6 +572,17 @@ dtors_section () \ } \ } +/* 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) \ @@ -513,7 +620,10 @@ 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 (); \ @@ -539,7 +649,12 @@ dtors_section () \ #define TYPE_ASM_OP ".type" #define SIZE_ASM_OP ".size" -#define WEAK_ASM_OP ".weak" + +/* 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 @@ -586,15 +701,38 @@ 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) \ @@ -627,10 +765,11 @@ 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\ @@ -751,3 +890,6 @@ dtors_section () \ fprintf ((FILE), "\"\n"); \ } \ while (0) + +/* All SVR4 targets use the ELF object file format. */ +#define OBJECT_FORMAT_ELF