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/* Definitions of target machine for GNU compiler, for DEC Alpha w/ELF.
Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2007, 2008,
2009, 2010 Free Software Foundation, Inc.
Contributed by Richard Henderson (rth@tamu.edu).
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 3, 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 COPYING3. If not see
<http://www.gnu.org/licenses/>. */
#undef OBJECT_FORMAT_COFF
#undef EXTENDED_COFF
#define OBJECT_FORMAT_ELF
/* ??? Move all SDB stuff from alpha.h to osf.h. */
#undef SDB_DEBUGGING_INFO
#define DBX_DEBUGGING_INFO 1
#define DWARF2_DEBUGGING_INFO 1
#undef PREFERRED_DEBUGGING_TYPE
#define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
#undef ASM_FINAL_SPEC
/* alpha/ doesn't use elfos.h for some reason. */
#define TARGET_OBJFMT_CPP_BUILTINS() \
do \
{ \
builtin_define ("__ELF__"); \
} \
while (0)
#undef CC1_SPEC
#define CC1_SPEC "%{G*}"
#undef ASM_SPEC
#define ASM_SPEC "%{G*} %{relax:-relax} %{!gstabs*:-no-mdebug}%{gstabs*:-mdebug}"
#undef IDENT_ASM_OP
#define IDENT_ASM_OP "\t.ident\t"
/* Output #ident as a .ident. */
#undef ASM_OUTPUT_IDENT
#define ASM_OUTPUT_IDENT(FILE, NAME) \
fprintf (FILE, "%s\"%s\"\n", IDENT_ASM_OP, NAME);
/* This is how to allocate empty space in some section. The .zero
pseudo-op is used for this on most svr4 assemblers. */
#undef SKIP_ASM_OP
#define SKIP_ASM_OP "\t.zero\t"
#undef ASM_OUTPUT_SKIP
#define ASM_OUTPUT_SKIP(FILE, SIZE) \
fprintf (FILE, "%s"HOST_WIDE_INT_PRINT_UNSIGNED"\n", SKIP_ASM_OP, (SIZE))
/* 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. */
#undef ALIGN_ASM_OP
#define ALIGN_ASM_OP "\t.align\t"
#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) \
(*targetm.asm_out.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. */
#undef ASM_OUTPUT_EXTERNAL_LIBCALL
#define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, FUN) \
(*targetm.asm_out.globalize_label) (FILE, XSTR (FUN, 0))
/* This says how to output assembler code to declare an
uninitialized external linkage data object. Under SVR4,
the linker seems to want the alignment of data objects
to depend on their types. We do exactly that here. */
#undef COMMON_ASM_OP
#define COMMON_ASM_OP "\t.comm\t"
#undef ASM_OUTPUT_ALIGNED_COMMON
#define ASM_OUTPUT_ALIGNED_COMMON(FILE, NAME, SIZE, ALIGN) \
do { \
fprintf ((FILE), "%s", COMMON_ASM_OP); \
assemble_name ((FILE), (NAME)); \
fprintf ((FILE), "," HOST_WIDE_INT_PRINT_UNSIGNED ",%u\n", (SIZE), (ALIGN) / BITS_PER_UNIT); \
} while (0)
/* This says how to output assembler code to declare an
uninitialized internal linkage data object. Under SVR4,
the linker seems to want the alignment of data objects
to depend on their types. We do exactly that here. */
#undef ASM_OUTPUT_ALIGNED_LOCAL
#define ASM_OUTPUT_ALIGNED_LOCAL(FILE, NAME, SIZE, ALIGN) \
do { \
if ((SIZE) <= (unsigned HOST_WIDE_INT) g_switch_value) \
switch_to_section (sbss_section); \
else \
switch_to_section (bss_section); \
ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "object"); \
if (!flag_inhibit_size_directive) \
ASM_OUTPUT_SIZE_DIRECTIVE (FILE, NAME, SIZE); \
ASM_OUTPUT_ALIGN ((FILE), exact_log2((ALIGN) / BITS_PER_UNIT)); \
ASM_OUTPUT_LABEL(FILE, NAME); \
ASM_OUTPUT_SKIP((FILE), (SIZE) ? (SIZE) : 1); \
} while (0)
/* This says how to output assembler code to declare an
uninitialized external linkage data object. */
#undef ASM_OUTPUT_ALIGNED_BSS
#define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
do { \
ASM_OUTPUT_ALIGNED_LOCAL (FILE, NAME, SIZE, ALIGN); \
} while (0)
/* The biggest alignment supported by ELF in bits. 32-bit ELF
supports section alignment up to (0x80000000 * 8), while
64-bit ELF supports (0x8000000000000000 * 8). If this macro
is not defined, the default is the largest alignment supported
by 32-bit ELF and representable on a 32-bit host. Use this
macro to limit the alignment which can be specified using
the `__attribute__ ((aligned (N)))' construct.
This value is really 2^63. Since gcc figures the alignment in bits,
we could only potentially get to 2^60 on suitable hosts. Due to other
considerations in varasm, we must restrict this to what fits in an int. */
#undef MAX_OFILE_ALIGNMENT
#define MAX_OFILE_ALIGNMENT (((unsigned int) 1 << 28) * 8)
/* This is the pseudo-op used to generate a contiguous sequence of byte
values from a double-quoted string WITHOUT HAVING A TERMINATING NUL
AUTOMATICALLY APPENDED. This is the same for most svr4 assemblers. */
#undef ASCII_DATA_ASM_OP
#define ASCII_DATA_ASM_OP "\t.ascii\t"
#undef READONLY_DATA_SECTION_ASM_OP
#define READONLY_DATA_SECTION_ASM_OP "\t.section\t.rodata"
#undef BSS_SECTION_ASM_OP
#define BSS_SECTION_ASM_OP "\t.section\t.bss"
#undef SBSS_SECTION_ASM_OP
#define SBSS_SECTION_ASM_OP "\t.section\t.sbss,\"aw\""
#undef SDATA_SECTION_ASM_OP
#define SDATA_SECTION_ASM_OP "\t.section\t.sdata,\"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. */
#undef INIT_SECTION_ASM_OP
#define INIT_SECTION_ASM_OP "\t.section\t.init"
#undef FINI_SECTION_ASM_OP
#define FINI_SECTION_ASM_OP "\t.section\t.fini"
#ifdef HAVE_GAS_SUBSECTION_ORDERING
#define ASM_SECTION_START_OP "\t.subsection\t-1"
/* Output assembly directive to move to the beginning of current section. */
#define ASM_OUTPUT_SECTION_START(FILE) \
fprintf ((FILE), "%s\n", ASM_SECTION_START_OP)
#endif
/* Switch into a generic section. */
#define TARGET_ASM_NAMED_SECTION default_elf_asm_named_section
#define TARGET_ASM_SELECT_SECTION default_elf_select_section
#define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1)
/* Define the strings used for the special svr4 .type and .size directives.
These strings generally do not vary from one system running svr4 to
another, but if a given system (e.g. m88k running svr) needs to use
different pseudo-op names for these, they may be overridden in the
file which includes this one. */
#undef TYPE_ASM_OP
#define TYPE_ASM_OP "\t.type\t"
#undef SIZE_ASM_OP
#define SIZE_ASM_OP "\t.size\t"
/* This is how we tell the assembler that a symbol is weak. */
#undef ASM_WEAKEN_LABEL
#define ASM_WEAKEN_LABEL(FILE, NAME) \
do { fputs ("\t.weak\t", FILE); assemble_name (FILE, NAME); \
fputc ('\n', FILE); } while (0)
/* This is how we tell the assembler that two symbols have the same value. */
#undef ASM_OUTPUT_DEF
#define ASM_OUTPUT_DEF(FILE, ALIAS, NAME) \
do { \
assemble_name(FILE, ALIAS); \
fputs(" = ", FILE); \
assemble_name(FILE, NAME); \
fputc('\n', FILE); \
} while (0)
#undef ASM_OUTPUT_DEF_FROM_DECLS
#define ASM_OUTPUT_DEF_FROM_DECLS(FILE, DECL, TARGET) \
do { \
const char *alias = XSTR (XEXP (DECL_RTL (DECL), 0), 0); \
const char *name = IDENTIFIER_POINTER (TARGET); \
if (TREE_CODE (DECL) == FUNCTION_DECL) \
{ \
fputc ('$', FILE); \
assemble_name (FILE, alias); \
fputs ("..ng = $", FILE); \
assemble_name (FILE, name); \
fputs ("..ng\n", FILE); \
} \
assemble_name(FILE, alias); \
fputs(" = ", 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
is just a default. You may need to override it in your machine-
specific tm.h file (depending upon the particulars of your assembler). */
#undef TYPE_OPERAND_FMT
#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. These macros also output
the starting labels for the relevant functions/objects. */
/* Write the extra assembler code needed to declare an object properly. */
#ifdef HAVE_GAS_GNU_UNIQUE_OBJECT
#define USE_GNU_UNIQUE_OBJECT 1
#else
#define USE_GNU_UNIQUE_OBJECT 0
#endif
#undef ASM_DECLARE_OBJECT_NAME
#define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL) \
do { \
HOST_WIDE_INT size; \
\
/* For template static data member instantiations or \
inline fn local statics and their guard variables, use \
gnu_unique_object so that they will be combined even under \
RTLD_LOCAL. Don't use gnu_unique_object for typeinfo, \
vtables and other read-only artificial decls. */ \
if (USE_GNU_UNIQUE_OBJECT && DECL_ONE_ONLY (DECL) \
&& (!DECL_ARTIFICIAL (DECL) || !TREE_READONLY (DECL))) \
ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "gnu_unique_object"); \
else \
ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "object"); \
\
size_directive_output = 0; \
if (!flag_inhibit_size_directive \
&& (DECL) && DECL_SIZE (DECL)) \
{ \
size_directive_output = 1; \
size = int_size_in_bytes (TREE_TYPE (DECL)); \
ASM_OUTPUT_SIZE_DIRECTIVE (FILE, NAME, size); \
} \
\
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. */
#undef ASM_FINISH_DECLARE_OBJECT
#define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP_LEVEL, AT_END) \
do { \
const char *name = XSTR (XEXP (DECL_RTL (DECL), 0), 0); \
HOST_WIDE_INT size; \
if (!flag_inhibit_size_directive \
&& DECL_SIZE (DECL) \
&& ! AT_END && TOP_LEVEL \
&& DECL_INITIAL (DECL) == error_mark_node \
&& !size_directive_output \
&& (size = int_size_in_bytes (TREE_TYPE (DECL))) > 0) \
{ \
size_directive_output = 1; \
ASM_OUTPUT_SIZE_DIRECTIVE (FILE, name, size); \
} \
} while (0)
/* A table of bytes codes used by the ASM_OUTPUT_ASCII and
ASM_OUTPUT_LIMITED_STRING macros. Each byte in the table
corresponds to a particular byte value [0..255]. For any
given byte value, if the value in the corresponding table
position is zero, the given character can be output directly.
If the table value is 1, the byte must be output as a \ooo
octal escape. If the tables value is anything else, then the
byte value should be output as a \ followed by the value
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. Also, we don't use \v
since some versions of gas, such as 2.2 did not accept it. */
#undef ESCAPES
#define ESCAPES \
"\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\
\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\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\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\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\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\1\1\1"
/* Some svr4 assemblers have a limit on the number of characters which
can appear in the operand of a .string directive. If your assembler
has such a limitation, you should define STRING_LIMIT to reflect that
limit. Note that at least some svr4 assemblers have a limit on the
actual number of bytes in the double-quoted string, and that they
count each character in an escape sequence as one byte. Thus, an
escape sequence like \377 would count as four bytes.
If your target assembler doesn't support the .string directive, you
should define this to zero. */
#undef STRING_LIMIT
#define STRING_LIMIT ((unsigned) 256)
#undef STRING_ASM_OP
#define STRING_ASM_OP "\t.string\t"
/* GAS is the only Alpha/ELF assembler. */
#undef TARGET_GAS
#define TARGET_GAS (1)
/* Provide a STARTFILE_SPEC appropriate for ELF. Here we add the
(even more) magical crtbegin.o file which provides part of the
support for getting C++ file-scope static object constructed
before entering `main'. */
#undef STARTFILE_SPEC
#ifdef HAVE_LD_PIE
#define STARTFILE_SPEC \
"%{!shared: %{pg|p:gcrt1.o%s;pie:Scrt1.o%s;:crt1.o%s}}\
crti.o%s %{static:crtbeginT.o%s;shared|pie:crtbeginS.o%s;:crtbegin.o%s}"
#else
#define STARTFILE_SPEC \
"%{!shared: %{pg|p:gcrt1.o%s;:crt1.o%s}}\
crti.o%s %{static:crtbeginT.o%s;shared|pie:crtbeginS.o%s;:crtbegin.o%s}"
#endif
/* Provide a ENDFILE_SPEC appropriate for ELF. Here we tack on the
magical crtend.o file which provides part of the support for
getting C++ file-scope static object constructed before entering
`main', followed by a normal ELF "finalizer" file, `crtn.o'. */
#undef ENDFILE_SPEC
#define ENDFILE_SPEC \
"%{Ofast|ffast-math|funsafe-math-optimizations:crtfastmath.o%s} \
%{shared|pie:crtendS.o%s;:crtend.o%s} crtn.o%s"
/* 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.
Since application size is already constrained to <2GB by the form of
the ldgp relocation, we can use a 32-bit pc-relative relocation to
static data. Dynamic data is accessed indirectly to allow for read
only EH sections. */
#define ASM_PREFERRED_EH_DATA_FORMAT(CODE,GLOBAL) \
(((GLOBAL) ? DW_EH_PE_indirect : 0) | DW_EH_PE_pcrel | DW_EH_PE_sdata4)
/* If defined, a C statement to be executed just prior to the output of
assembler code for INSN. */
#define FINAL_PRESCAN_INSN(INSN, OPVEC, NOPERANDS) \
(alpha_this_literal_sequence_number = 0, \
alpha_this_gpdisp_sequence_number = 0)
extern int alpha_this_literal_sequence_number;
extern int alpha_this_gpdisp_sequence_number;
/* Since the bits of the _init and _fini function is spread across
many object files, each potentially with its own GP, we must assume
we need to load our GP. Further, the .init/.fini section can
easily be more than 4MB away from the function to call so we can't
use bsr. */
#define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC) \
asm (SECTION_OP "\n" \
" br $29,1f\n" \
"1: ldgp $29,0($29)\n" \
" unop\n" \
" jsr $26," USER_LABEL_PREFIX #FUNC "\n" \
" .align 3\n" \
" .previous");
/* If we have the capability create headers for efficient EH lookup.
As of Jan 2002, only glibc 2.2.4 can actually make use of this, but
I imagine that other systems will catch up. In the meantime, it
doesn't harm to make sure that the data exists to be used later. */
#if defined(HAVE_LD_EH_FRAME_HDR)
#define LINK_EH_SPEC "%{!static:--eh-frame-hdr} "
#endif
/* A C statement (sans semicolon) to output to the stdio stream STREAM
any text necessary for declaring the name of an external symbol
named NAME which is referenced in this compilation but not defined.
It is needed to properly support non-default visibility. */
#ifndef ASM_OUTPUT_EXTERNAL
#define ASM_OUTPUT_EXTERNAL(FILE, DECL, NAME) \
default_elf_asm_output_external (FILE, DECL, NAME)
#endif
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