289 lines
11 KiB
C
289 lines
11 KiB
C
/* Definitions of target machine for GNU compiler,
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for IBM RS/6000 POWER running AIX.
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Copyright (C) 2000-2021 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published
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by the Free Software Foundation; either version 3, or (at your
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option) any later version.
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GCC is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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License for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING3. If not see
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<http://www.gnu.org/licenses/>. */
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/* Yes! We are AIX! */
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#define DEFAULT_ABI ABI_AIX
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#undef TARGET_AIX
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#define TARGET_AIX 1
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/* System headers are not C++-aware. */
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#define SYSTEM_IMPLICIT_EXTERN_C 1
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/* Linux64.h wants to redefine TARGET_AIX based on -m64, but it can't be used
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in the #if conditional in options-default.h, so provide another macro. */
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#undef TARGET_AIX_OS
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#define TARGET_AIX_OS 1
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/* AIX always has a TOC. */
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#define TARGET_HAS_TOC 1
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#define FIXED_R2 1
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/* AIX allows r13 to be used in 32-bit mode. */
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#define FIXED_R13 0
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/* 32-bit and 64-bit AIX stack boundary is 128. */
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#undef STACK_BOUNDARY
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#define STACK_BOUNDARY 128
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/* Offset within stack frame to start allocating local variables at.
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If FRAME_GROWS_DOWNWARD, this is the offset to the END of the
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first local allocated. Otherwise, it is the offset to the BEGINNING
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of the first local allocated.
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On the RS/6000, the frame pointer is the same as the stack pointer,
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except for dynamic allocations. So we start after the fixed area and
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outgoing parameter area.
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If the function uses dynamic stack space (CALLS_ALLOCA is set), that
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space needs to be aligned to STACK_BOUNDARY, i.e. the sum of the
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sizes of the fixed area and the parameter area must be a multiple of
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STACK_BOUNDARY. */
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#undef RS6000_STARTING_FRAME_OFFSET
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#define RS6000_STARTING_FRAME_OFFSET \
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(cfun->calls_alloca \
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? RS6000_ALIGN (crtl->outgoing_args_size + RS6000_SAVE_AREA, 16) \
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: (RS6000_ALIGN (crtl->outgoing_args_size, 16) + RS6000_SAVE_AREA))
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/* Offset from the stack pointer register to an item dynamically
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allocated on the stack, e.g., by `alloca'.
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The default value for this macro is `STACK_POINTER_OFFSET' plus the
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length of the outgoing arguments. The default is correct for most
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machines. See `function.c' for details.
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This value must be a multiple of STACK_BOUNDARY (hard coded in
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`emit-rtl.c'). */
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#undef STACK_DYNAMIC_OFFSET
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#define STACK_DYNAMIC_OFFSET(FUNDECL) \
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RS6000_ALIGN (crtl->outgoing_args_size.to_constant () \
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+ STACK_POINTER_OFFSET, 16)
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#undef TARGET_IEEEQUAD
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#define TARGET_IEEEQUAD 0
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#undef TARGET_IEEEQUAD_DEFAULT
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#define TARGET_IEEEQUAD_DEFAULT 0
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/* The AIX linker will discard static constructors in object files before
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collect has a chance to see them, so scan the object files directly. */
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#define COLLECT_EXPORT_LIST
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/* On AIX, initialisers specified with -binitfini are called in breadth-first
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order.
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e.g. if a.out depends on lib1.so, the init function for a.out is called before
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the init function for lib1.so.
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To ensure global C++ constructors in linked libraries are run before global
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C++ constructors from the current module, there is additional symbol scanning
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logic in collect2.
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The global initialiser/finaliser functions are named __GLOBAL_AIXI_{libname}
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and __GLOBAL_AIXD_{libname} and are exported from each shared library.
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collect2 will detect these symbols when they exist in shared libraries that
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the current program is being linked against. All such initiliser functions
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will be called prior to the constructors of the current program, and
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finaliser functions called after destructors.
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Reference counting generated by collect2 will ensure that constructors are
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only invoked once in the case of multiple dependencies on a library.
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-binitfini is still used in parallel to this solution.
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This handles the case where a library is loaded through dlopen(), and also
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handles the option -blazy.
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*/
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#define COLLECT_SHARED_INIT_FUNC(STREAM, FUNC) \
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fprintf ((STREAM), "void %s() {\n\t%s();\n}\n", aix_shared_initname, (FUNC))
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#define COLLECT_SHARED_FINI_FUNC(STREAM, FUNC) \
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fprintf ((STREAM), "void %s() {\n\t%s();\n}\n", aix_shared_fininame, (FUNC))
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#if HAVE_AS_REF
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/* Issue assembly directives that create a reference to the given DWARF table
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identifier label from the current function section. This is defined to
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ensure we drag frame tables associated with needed function bodies in
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a link with garbage collection activated. */
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#define ASM_OUTPUT_DWARF_TABLE_REF rs6000_aix_asm_output_dwarf_table_ref
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#endif
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/* This is the only version of nm that collect2 can work with. */
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#define REAL_NM_FILE_NAME "/usr/ucb/nm"
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#define USER_LABEL_PREFIX ""
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/* Don't turn -B into -L if the argument specifies a relative file name. */
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#define RELATIVE_PREFIX_NOT_LINKDIR
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/* Because of the above, we must have gcc search itself to find libgcc.a. */
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#define LINK_LIBGCC_SPECIAL_1
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/* Names to predefine in the preprocessor for this target machine. */
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#define TARGET_OS_AIX_CPP_BUILTINS() \
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do \
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{ \
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builtin_define ("_IBMR2"); \
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builtin_define ("_POWER"); \
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builtin_define ("__unix__"); \
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builtin_define ("_AIX"); \
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builtin_define ("_AIX32"); \
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builtin_define ("_AIX41"); \
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builtin_define ("_LONG_LONG"); \
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if (TARGET_LONG_DOUBLE_128) \
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builtin_define ("__LONGDOUBLE128"); \
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builtin_assert ("system=unix"); \
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builtin_assert ("system=aix"); \
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if (TARGET_64BIT) \
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{ \
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builtin_define ("__PPC__"); \
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builtin_define ("__PPC64__"); \
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builtin_define ("__powerpc__"); \
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builtin_define ("__powerpc64__"); \
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builtin_assert ("cpu=powerpc64"); \
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builtin_assert ("machine=powerpc64"); \
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} \
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else \
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{ \
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builtin_define ("__PPC__"); \
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builtin_define ("__powerpc__"); \
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builtin_assert ("cpu=powerpc"); \
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builtin_assert ("machine=powerpc"); \
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} \
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} \
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while (0)
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/* Define appropriate architecture macros for preprocessor depending on
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target switches. */
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#define CPP_SPEC "%{posix: -D_POSIX_SOURCE}\
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%{ansi: -D_ANSI_C_SOURCE}"
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#define CC1_SPEC "%(cc1_cpu)"
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#undef ASM_DEFAULT_SPEC
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#define ASM_DEFAULT_SPEC ""
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/* Tell the assembler to assume that all undefined names are external.
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Don't do this until the fixed IBM assembler is more generally available.
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When this becomes permanently defined, the ASM_OUTPUT_EXTERNAL,
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ASM_OUTPUT_EXTERNAL_LIBCALL, and RS6000_OUTPUT_BASENAME macros will no
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longer be needed. Also, the extern declaration of mcount in
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rs6000_xcoff_file_start will no longer be needed. */
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/* #define ASM_SPEC "-u %(asm_cpu)" */
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/* Default location of syscalls.exp under AIX */
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#define LINK_SYSCALLS_SPEC "-bI:%R/lib/syscalls.exp"
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/* Default location of libg.exp under AIX */
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#define LINK_LIBG_SPEC "-bexport:%R/usr/lib/libg.exp"
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/* Define the options for the binder: Start text at 512, align all segments
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to 512 bytes, and warn if there is text relocation.
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The -bhalt:4 option supposedly changes the level at which ld will abort,
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but it also suppresses warnings about multiply defined symbols and is
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used by the AIX cc command. So we use it here.
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-bnodelcsect undoes a poor choice of default relating to multiply-defined
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csects. See AIX documentation for more information about this.
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-bM:SRE tells the linker that the output file is Shared REusable. Note
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that to actually build a shared library you will also need to specify an
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export list with the -Wl,-bE option. */
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#define LINK_SPEC "-T512 -H512 %{!r:-btextro} -bhalt:4 -bnodelcsect\
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%{static:-bnso %(link_syscalls) } \
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%{!shared:%{g*: %(link_libg) }} %{shared:-bM:SRE}"
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/* Profiled library versions are used by linking with special directories. */
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#define LIB_SPEC "%{pg:-L%R/lib/profiled -L%R/usr/lib/profiled}\
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%{p:-L%R/lib/profiled -L%R/usr/lib/profiled} %{!shared:%{g*:-lg}} -lc"
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/* Static linking with shared libstdc++ requires libsupc++ as well. */
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#define LIBSTDCXX_STATIC "supc++"
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/* This now supports a natural alignment mode. */
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/* AIX word-aligns FP doubles but doubleword-aligns 64-bit ints. */
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#define ADJUST_FIELD_ALIGN(FIELD, TYPE, COMPUTED) \
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(TARGET_ALIGN_NATURAL == 0 \
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? rs6000_special_adjust_field_align (TYPE, COMPUTED) \
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: (COMPUTED))
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/* AIX increases natural record alignment to doubleword if the first
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field is an FP double while the FP fields remain word aligned. */
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#define ROUND_TYPE_ALIGN(STRUCT, COMPUTED, SPECIFIED) \
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((TREE_CODE (STRUCT) == RECORD_TYPE \
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|| TREE_CODE (STRUCT) == UNION_TYPE \
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|| TREE_CODE (STRUCT) == QUAL_UNION_TYPE) \
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&& TARGET_ALIGN_NATURAL == 0 \
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? rs6000_special_round_type_align (STRUCT, COMPUTED, SPECIFIED) \
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: MAX ((COMPUTED), (SPECIFIED)))
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/* The AIX ABI isn't explicit on whether aggregates smaller than a
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word/doubleword should be padded upward or downward. One could
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reasonably assume that they follow the normal rules for structure
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layout treating the parameter area as any other block of memory,
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then map the reg param area to registers, i.e., pad upward, which
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is the way IBM Compilers for AIX behave.
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Setting both of the following defines results in this behavior. */
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#define AGGREGATE_PADDING_FIXED 1
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#define AGGREGATES_PAD_UPWARD_ALWAYS 1
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/* Specify padding for the last element of a block move between
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registers and memory. FIRST is nonzero if this is the only
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element. */
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#define BLOCK_REG_PADDING(MODE, TYPE, FIRST) \
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(!(FIRST) ? PAD_UPWARD : targetm.calls.function_arg_padding (MODE, TYPE))
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/* Indicate that jump tables go in the text section. */
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#define JUMP_TABLES_IN_TEXT_SECTION 1
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/* Define any extra SPECS that the compiler needs to generate. */
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#undef SUBTARGET_EXTRA_SPECS
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#define SUBTARGET_EXTRA_SPECS \
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{ "link_syscalls", LINK_SYSCALLS_SPEC }, \
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{ "link_libg", LINK_LIBG_SPEC }
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#define PROFILE_HOOK(LABEL) output_profile_hook (LABEL)
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/* No version of AIX fully supports AltiVec or 64-bit instructions in
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32-bit mode. */
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#define OS_MISSING_POWERPC64 1
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#define OS_MISSING_ALTIVEC 1
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/* WINT_TYPE */
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#define WINT_TYPE "int"
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/* Static stack checking is supported by means of probes. */
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#define STACK_CHECK_STATIC_BUILTIN 1
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/* Use standard DWARF numbering for DWARF debugging information. */
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#define RS6000_USE_DWARF_NUMBERING
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#define TARGET_PRECOMPUTE_TLS_P rs6000_aix_precompute_tls_p
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/* Replace -m64 with -maix64 and -m32 with -maix32. */
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#undef SUBTARGET_DRIVER_SELF_SPECS
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#define SUBTARGET_DRIVER_SELF_SPECS \
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"%{m64:-maix64} %<m64", \
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"%{m32:-maix32} %<m32"
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