339 lines
11 KiB
C
339 lines
11 KiB
C
/* NETBSD_NATIVE is defined when gcc is integrated into the NetBSD
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source tree so it can be configured appropriately without using
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the GNU configure/build mechanism. */
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#ifdef NETBSD_NATIVE
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/* Look for the include files in the system-defined places. */
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#undef GPLUSPLUS_INCLUDE_DIR
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#define GPLUSPLUS_INCLUDE_DIR "/usr/include/g++"
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#undef STANDARD_INCLUDE_DIR
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#define STANDARD_INCLUDE_DIR "/usr/include"
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#undef INCLUDE_DEFAULTS
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#define INCLUDE_DEFAULTS \
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{ \
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{ GPLUSPLUS_INCLUDE_DIR, "G++", 1, 1 }, \
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{ STANDARD_INCLUDE_DIR, 0, 0, 0 }, \
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{ 0, 0, 0, 0 } \
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}
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/* Under NetBSD, the normal location of the compiler back ends is the
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/usr/libexec directory. */
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#undef MD_EXEC_PREFIX
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#define MD_EXEC_PREFIX "/usr/libexec/"
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/* Under NetBSD, the normal location of the various *crt*.o files is the
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/usr/lib directory. */
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#undef STANDARD_STARTFILE_PREFIX
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#define STANDARD_STARTFILE_PREFIX "/usr/lib/"
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#endif /* NETBSD_NATIVE */
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/* Provide a CPP_SPEC appropriate for NetBSD. Current we just deal with
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the GCC option `-posix'. We also deal with -pthread, which is required
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for the 2.95.3 STL to work. */
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#undef CPP_SPEC
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#define CPP_SPEC \
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"%(cpp_cpu) %{posix:-D_POSIX_SOURCE} \
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%{pthread:-D_REENTRANT -D_PTHREADS}"
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/* Provide an ASM_SPEC appropriate for NetBSD. Currently we only deal
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with the options for generating PIC code. */
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#undef ASM_SPEC
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#define ASM_SPEC " %| %{fpic:-k} %{fPIC:-k -K}"
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/* Provide a LIB_SPEC appropriate for NetBSD. Just select the appropriate
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libc, depending on whether we're doing profiling; if `-posix' is specified,
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link against the appropriate libposix first. Don't include libc when
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linking a shared library. */
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#undef LIB_SPEC
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#define LIB_SPEC \
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"%{pthread:%{!p:%{!pg:-lpthread}}%{p:-lpthread_p}%{pg:-lpthread_p}} \
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%{posix:%{!p:%{!pg:-lposix}}%{p:-lposix_p}%{pg:-lposix_p}} \
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%{!shared:%{!symbolic:%{!p:%{!pg:-lc}}%{p:-lc_p}%{pg:-lc_p}}}"
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/* Provide a LIBGCC_SPEC appropriate for NetBSD. We also want to exclude
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libgcc when -symbolic. */
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#undef LIBGCC_SPEC
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#ifdef NETBSD_NATIVE
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#define LIBGCC_SPEC "%{!symbolic:%{!shared:%{!p:%{!pg:-lgcc}}}%{shared:-lgcc_pic}%{p:-lgcc_p}%{pg:-lgcc_p}}"
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#else
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#define LIBGCC_SPEC "%{!symbolic:%{!shared:-lgcc}%{shared:-lgcc_pic}}"
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#endif
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/* #ifdef NETBSD_AOUT */
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/* Provide a STARTFILE_SPEC appropriate for NetBSD a.out. Here we
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provide support for the special GCC option -static. */
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#undef STARTFILE_SPEC
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#define STARTFILE_SPEC \
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"%{!shared:%{pg:gcrt0%O%s}%{!pg:%{p:mcrt0%O%s}%{!p:%{!static:crt0%O%s}%{static:scrt0%O%s}}}} %{shared:c++rt0%O%s}"
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/* Provide a LINK_SPEC appropriate for NetBSD. Here we provide support
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for the special GCC options -static, -assert, and -nostdlib. */
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#undef LINK_SPEC
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#define LINK_SPEC \
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"%{nostdlib:-nostdlib} %{!shared:%{!nostdlib:%{!r*:%{!e*:-e start}}} -dc -dp %{static:-Bstatic}} %{shared:-Bshareable} %{R*} %{assert*}"
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/* #endif NETBSD_AOUT */
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/* This defines which switch letters take arguments. */
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#undef SWITCH_TAKES_ARG
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#define SWITCH_TAKES_ARG(CHAR) \
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(DEFAULT_SWITCH_TAKES_ARG(CHAR) \
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|| (CHAR) == 'R')
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/* We have atexit(3). */
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#define HAVE_ATEXIT
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/* Implicit library calls should use memcpy, not bcopy, etc. */
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#define TARGET_MEM_FUNCTIONS
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/* Handle #pragma weak and #pragma pack. */
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#define HANDLE_SYSV_PRAGMA
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/*
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* Some imports from svr4.h in support of shared libraries.
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* Currently, we need the DECLARE_OBJECT_SIZE stuff.
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*/
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/* Define the strings used for the .type, .size, and .set directives.
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These strings generally do not vary from one system running netbsd
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to another, but if a given system needs to use different pseudo-op
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names for these, they may be overridden in the file which includes
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this one. */
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#undef TYPE_ASM_OP
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#undef SIZE_ASM_OP
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#undef SET_ASM_OP
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#define TYPE_ASM_OP ".type"
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#define SIZE_ASM_OP ".size"
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#define SET_ASM_OP ".set"
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/* This is how we tell the assembler that a symbol is weak. */
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#undef ASM_WEAKEN_LABEL
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#define ASM_WEAKEN_LABEL(FILE,NAME) \
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do { fputs ("\t.globl\t", FILE); assemble_name (FILE, NAME); \
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fputc ('\n', FILE); \
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fputs ("\t.weak\t", FILE); assemble_name (FILE, NAME); \
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fputc ('\n', FILE); } while (0)
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/* The following macro defines the format used to output the second
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operand of the .type assembler directive. Different svr4 assemblers
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expect various different forms for this operand. The one given here
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is just a default. You may need to override it in your machine-
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specific tm.h file (depending upon the particulars of your assembler). */
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#undef TYPE_OPERAND_FMT
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#define TYPE_OPERAND_FMT "@%s"
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/* Write the extra assembler code needed to declare a function's result.
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Most svr4 assemblers don't require any special declaration of the
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result value, but there are exceptions. */
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#ifndef ASM_DECLARE_RESULT
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#define ASM_DECLARE_RESULT(FILE, RESULT)
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#endif
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/* NetBSD a.out support begins here. */
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#ifndef NETBSD_ELF
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#undef DWARF_DEBUGGING_INFO /* XXX */
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#undef DWARF2_DEBUGGING_INFO /* XXX */
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/* Write the extra assembler code needed to declare a function properly.
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Some svr4 assemblers need to also have something extra said about the
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function's return value. We allow for that here. */
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#undef ASM_DECLARE_FUNCTION_NAME
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#define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL) \
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do { \
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fprintf (FILE, "\t%s\t ", TYPE_ASM_OP); \
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assemble_name (FILE, NAME); \
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putc (',', FILE); \
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fprintf (FILE, TYPE_OPERAND_FMT, "function"); \
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putc ('\n', FILE); \
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ASM_DECLARE_RESULT (FILE, DECL_RESULT (DECL)); \
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ASM_OUTPUT_LABEL(FILE, NAME); \
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} while (0)
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/* Write the extra assembler code needed to declare an object properly. */
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#undef ASM_DECLARE_OBJECT_NAME
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#define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL) \
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do { \
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fprintf (FILE, "\t%s\t ", TYPE_ASM_OP); \
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assemble_name (FILE, NAME); \
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putc (',', FILE); \
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fprintf (FILE, TYPE_OPERAND_FMT, "object"); \
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putc ('\n', FILE); \
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size_directive_output = 0; \
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if (!flag_inhibit_size_directive && DECL_SIZE (DECL)) \
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{ \
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size_directive_output = 1; \
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fprintf (FILE, "\t%s\t ", SIZE_ASM_OP); \
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assemble_name (FILE, NAME); \
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fprintf (FILE, ",%d\n", int_size_in_bytes (TREE_TYPE (DECL))); \
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} \
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ASM_OUTPUT_LABEL(FILE, NAME); \
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} while (0)
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/* Output the size directive for a decl in rest_of_decl_compilation
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in the case where we did not do so before the initializer.
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Once we find the error_mark_node, we know that the value of
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size_directive_output was set
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by ASM_DECLARE_OBJECT_NAME when it was run for the same decl. */
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#undef ASM_FINISH_DECLARE_OBJECT
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#define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP_LEVEL, AT_END) \
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do { \
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char *name = XSTR (XEXP (DECL_RTL (DECL), 0), 0); \
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if (!flag_inhibit_size_directive && DECL_SIZE (DECL) \
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&& ! AT_END && TOP_LEVEL \
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&& DECL_INITIAL (DECL) == error_mark_node \
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&& !size_directive_output) \
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{ \
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size_directive_output = 1; \
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fprintf (FILE, "\t%s\t ", SIZE_ASM_OP); \
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assemble_name (FILE, name); \
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fprintf (FILE, ",%d\n", int_size_in_bytes (TREE_TYPE (DECL))); \
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} \
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} while (0)
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/* This is how to declare the size of a function. */
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#undef ASM_DECLARE_FUNCTION_SIZE
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#define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL) \
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do { \
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if (!flag_inhibit_size_directive) \
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{ \
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char label[256]; \
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static int labelno; \
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labelno++; \
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ASM_GENERATE_INTERNAL_LABEL (label, "Lfe", labelno); \
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ASM_OUTPUT_INTERNAL_LABEL (FILE, "Lfe", labelno); \
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fprintf (FILE, "\t%s\t ", SIZE_ASM_OP); \
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assemble_name (FILE, (FNAME)); \
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fprintf (FILE, ","); \
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assemble_name (FILE, label); \
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fprintf (FILE, "-"); \
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assemble_name (FILE, (FNAME)); \
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putc ('\n', FILE); \
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} \
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} while (0)
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#endif
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/* NetBSD ELF support begins here. */
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#ifdef NETBSD_ELF
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#undef DWARF_DEBUGGING_INFO /* XXX */
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#undef DWARF2_DEBUGGING_INFO /* XXX */
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/* Provide a STARTFILE_SPEC appropriate for NetBSD ELF targets. Here we
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provide support for the special GCC option -static. On ELF targets,
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we also add the crtbegin.o file which provides part of the support
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for getting C++ file-scope static objects constructed before entering
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`main'. */
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#undef STARTFILE_SPEC
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#define STARTFILE_SPEC \
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"%{!shared: \
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%{pg:gcrt0%O%s} \
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%{!pg: \
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%{p:gcrt0%O%s} \
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%{!p:crt0%O%s}}} \
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%:if-exists(crti%O%s) \
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%{!shared:crtbegin%O%s} %{shared:crtbeginS%O%s}"
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/* Provide an ENDFILE_SPEC appropriate for NetBSD ELF targets. Here we
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add crtend.o, which provides part of the support for getting C++
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file-scope static objects deconstructed after exiting `main'. */
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#undef ENDFILE_SPEC
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#define ENDFILE_SPEC \
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"%{!shared:crtend%O%s} %{shared:crtendS%O%s} \
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%:if-exists(crtn%O%s)"
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/* Provide a LINK_SPEC appropriate for a NetBSD ELF target. */
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#undef LINK_SPEC
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#define LINK_SPEC \
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"%{assert*} %{R*} \
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%{shared:-shared} \
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%{!shared: \
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-dc -dp \
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%{!nostdlib:%{!r*:%{!e*:-e __start}}} \
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%{!static: \
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%{rdynamic:-export-dynamic} \
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%{!dynamic-linker:-dynamic-linker /usr/libexec/ld.elf_so}} \
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%{static:-static}}"
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#endif /* NETBSD_ELF */
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/* Attempt to turn on execute permission for the stack. This may be
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used by TRANSFER_FROM_TRAMPOLINE of the target needs it (that is,
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if the target machine can change execute permissions on a page).
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There is no way to query the execute permission of the stack, so
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we always issue the mprotect() call.
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Note that we go out of our way to use namespace-non-invasive calls
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here. Unfortunately, there is no libc-internal name for mprotect().
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Also note that no errors should be emitted by this code; it is considered
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dangerous for library calls to send messages to stdout/stderr. */
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#define NETBSD_ENABLE_EXECUTE_STACK \
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extern void __enable_execute_stack (void *); \
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void \
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__enable_execute_stack (addr) \
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void *addr; \
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{ \
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extern int mprotect (void *, size_t, int); \
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extern int __sysctl (int *, unsigned int, void *, size_t *, \
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void *, size_t); \
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\
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static int size; \
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static long mask; \
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\
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char *page, *end; \
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\
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if (size == 0) \
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{ \
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int mib[2]; \
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size_t len; \
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\
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mib[0] = 6; /* CTL_HW */ \
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mib[1] = 7; /* HW_PAGESIZE */ \
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len = sizeof (size); \
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(void) __sysctl (mib, 2, &size, &len, NULL, 0); \
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mask = ~((long) size - 1); \
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} \
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\
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page = (char *) (((long) addr) & mask); \
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end = (char *) ((((long) (addr + TRAMPOLINE_SIZE)) & mask) + size); \
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\
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/* 7 == PROT_READ | PROT_WRITE | PROT_EXEC */ \
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(void) mprotect (page, end - page, 7); \
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}
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