1/* Definitions of target machine for GNU compiler,
2   for PowerPC machines running Linux.
3   Copyright (C) 1996-2020 Free Software Foundation, Inc.
4   Contributed by Michael Meissner (meissner@cygnus.com).
5
6   This file is part of GCC.
7
8   GCC is free software; you can redistribute it and/or modify it
9   under the terms of the GNU General Public License as published
10   by the Free Software Foundation; either version 3, or (at your
11   option) any later version.
12
13   GCC is distributed in the hope that it will be useful, but WITHOUT
14   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
15   or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
16   License for more details.
17
18   You should have received a copy of the GNU General Public License
19   along with GCC; see the file COPYING3.  If not see
20   <http://www.gnu.org/licenses/>.  */
21
22/* Linux doesn't support saving and restoring 64-bit regs in a 32-bit
23   process.  */
24#define OS_MISSING_POWERPC64 1
25
26/* We use glibc _mcount for profiling.  */
27#define NO_PROFILE_COUNTERS 1
28
29#ifdef SINGLE_LIBC
30#define OPTION_GLIBC  (DEFAULT_LIBC == LIBC_GLIBC)
31#define OPTION_UCLIBC (DEFAULT_LIBC == LIBC_UCLIBC)
32#define OPTION_BIONIC (DEFAULT_LIBC == LIBC_BIONIC)
33#undef OPTION_MUSL
34#define OPTION_MUSL   (DEFAULT_LIBC == LIBC_MUSL)
35#else
36#define OPTION_GLIBC  (linux_libc == LIBC_GLIBC)
37#define OPTION_UCLIBC (linux_libc == LIBC_UCLIBC)
38#define OPTION_BIONIC (linux_libc == LIBC_BIONIC)
39#undef OPTION_MUSL
40#define OPTION_MUSL   (linux_libc == LIBC_MUSL)
41#endif
42
43/* Determine what functions are present at the runtime;
44   this includes full c99 runtime and sincos.  */
45#undef TARGET_LIBC_HAS_FUNCTION
46#define TARGET_LIBC_HAS_FUNCTION linux_libc_has_function
47
48#undef  TARGET_OS_CPP_BUILTINS
49#define TARGET_OS_CPP_BUILTINS()			\
50  do							\
51    {							\
52      if (strcmp (rs6000_abi_name, "linux") == 0)	\
53	GNU_USER_TARGET_OS_CPP_BUILTINS();		\
54      builtin_define_std ("PPC");			\
55      builtin_define_std ("powerpc");			\
56      builtin_assert ("cpu=powerpc");			\
57      builtin_assert ("machine=powerpc");		\
58      TARGET_OS_SYSV_CPP_BUILTINS ();			\
59    }							\
60  while (0)
61
62#undef	CPP_OS_DEFAULT_SPEC
63#define CPP_OS_DEFAULT_SPEC "%(cpp_os_linux)"
64
65#undef  LINK_SHLIB_SPEC
66#define LINK_SHLIB_SPEC "%{shared:-shared} %{!shared: %{static:-static}} \
67  %{static-pie:-static -pie --no-dynamic-linker -z text}"
68
69#undef	LIB_DEFAULT_SPEC
70#define LIB_DEFAULT_SPEC "%(lib_linux)"
71
72#undef	STARTFILE_DEFAULT_SPEC
73#define STARTFILE_DEFAULT_SPEC "%(startfile_linux)"
74
75#undef	ENDFILE_DEFAULT_SPEC
76#define ENDFILE_DEFAULT_SPEC "%(endfile_linux)"
77
78#undef	LINK_START_DEFAULT_SPEC
79#define LINK_START_DEFAULT_SPEC "%(link_start_linux)"
80
81#undef	LINK_OS_DEFAULT_SPEC
82#define LINK_OS_DEFAULT_SPEC "%(link_os_linux)"
83
84#undef  DEFAULT_ASM_ENDIAN
85#if (TARGET_DEFAULT & MASK_LITTLE_ENDIAN)
86#define DEFAULT_ASM_ENDIAN " -mlittle"
87#define LINK_OS_LINUX_EMUL ENDIAN_SELECT(" -m elf32ppclinux",	\
88					 " -m elf32lppclinux",	\
89					 " -m elf32lppclinux")
90#else
91#define DEFAULT_ASM_ENDIAN " -mbig"
92#define LINK_OS_LINUX_EMUL ENDIAN_SELECT(" -m elf32ppclinux",	\
93					 " -m elf32lppclinux",	\
94					 " -m elf32ppclinux")
95#endif
96
97#undef LINK_OS_LINUX_SPEC
98#define LINK_OS_LINUX_SPEC LINK_OS_LINUX_EMUL " %{!shared: %{!static: \
99  %{!static-pie: \
100    %{rdynamic:-export-dynamic} \
101    -dynamic-linker " GNU_USER_DYNAMIC_LINKER "}}}"
102
103/* For backward compatibility, we must continue to use the AIX
104   structure return convention.  */
105#undef  DRAFT_V4_STRUCT_RET
106#define DRAFT_V4_STRUCT_RET 1
107
108/* We are 32-bit all the time, so optimize a little.  */
109#undef TARGET_64BIT
110#define TARGET_64BIT 0
111
112/* We don't need to generate entries in .fixup, except when
113   -mrelocatable or -mrelocatable-lib is given.  */
114#undef RELOCATABLE_NEEDS_FIXUP
115#define RELOCATABLE_NEEDS_FIXUP \
116  (rs6000_isa_flags & rs6000_isa_flags_explicit & OPTION_MASK_RELOCATABLE)
117
118#undef	RS6000_ABI_NAME
119#define	RS6000_ABI_NAME "linux"
120
121#ifdef TARGET_LIBC_PROVIDES_SSP
122/* ppc32 glibc provides __stack_chk_guard in -0x7008(2).  */
123#define TARGET_THREAD_SSP_OFFSET	-0x7008
124#endif
125
126#define POWERPC_LINUX
127
128/* ppc linux has 128-bit long double support in glibc 2.4 and later.  */
129#ifdef TARGET_DEFAULT_LONG_DOUBLE_128
130#define RS6000_DEFAULT_LONG_DOUBLE_SIZE 128
131#endif
132
133/* Static stack checking is supported by means of probes.  */
134#define STACK_CHECK_STATIC_BUILTIN 1
135
136/* Software floating point support for exceptions and rounding modes
137   depends on the C library in use.  */
138#undef TARGET_FLOAT_EXCEPTIONS_ROUNDING_SUPPORTED_P
139#define TARGET_FLOAT_EXCEPTIONS_ROUNDING_SUPPORTED_P \
140  rs6000_linux_float_exceptions_rounding_supported_p
141
142/* Support for TARGET_ATOMIC_ASSIGN_EXPAND_FENV without FPRs depends
143   on glibc 2.19 or greater.  */
144#if TARGET_GLIBC_MAJOR > 2 \
145  || (TARGET_GLIBC_MAJOR == 2 && TARGET_GLIBC_MINOR >= 19)
146#define RS6000_GLIBC_ATOMIC_FENV 1
147#endif
148