linux.h revision 1.1.1.3 
1/* Target macros for arc*-*-linux targets.
2
3   Copyright (C) 2017-2019 Free Software Foundation, Inc.
4
5This file is part of GCC.
6
7GCC is free software; you can redistribute it and/or modify
8it under the terms of the GNU General Public License as published by
9the Free Software Foundation; either version 3, or (at your option)
10any later version.
11
12GCC is distributed in the hope that it will be useful,
13but WITHOUT ANY WARRANTY; without even the implied warranty of
14MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15GNU General Public License for more details.
16
17You should have received a copy of the GNU General Public License
18along with GCC; see the file COPYING3.  If not see
19<http://www.gnu.org/licenses/>.  */
20
21/* Enable DWARF 2 exceptions.  */
22#undef DWARF2_UNWIND_INFO
23#define DWARF2_UNWIND_INFO 1
24
25#define TARGET_OS_CPP_BUILTINS()		\
26  do						\
27    {						\
28      GNU_USER_TARGET_OS_CPP_BUILTINS ();	\
29    }						\
30  while (0)
31
32#define GLIBC_DYNAMIC_LINKER   "/lib/ld-linux-arc.so.2"
33#define UCLIBC_DYNAMIC_LINKER  "/lib/ld-uClibc.so.0"
34
35/* Note that the default is to link against dynamic libraries, if they are
36   available.  Override with -static.  */
37#undef LINK_SPEC
38#define LINK_SPEC "%{h*} \
39  %{static:-Bstatic} \
40  %{shared:-shared} \
41  %{symbolic:-Bsymbolic} \
42  %{!static: \
43    %{rdynamic:-export-dynamic} \
44    %{!shared:-dynamic-linker " GNU_USER_DYNAMIC_LINKER "}} \
45  -X \
46  %{mbig-endian:-EB} %{EB} %{EL} \
47  %{!z:-z max-page-size=0x2000 -z common-page-size=0x2000} \
48  %{mcpu=nps400:-marclinux_nps; :-marclinux}"
49
50#undef STARTFILE_SPEC
51#define STARTFILE_SPEC							\
52  LINUX_OR_ANDROID_LD (GNU_USER_TARGET_STARTFILE_SPEC, ANDROID_STARTFILE_SPEC)
53
54#undef ENDFILE_SPEC
55#define ENDFILE_SPEC							\
56  LINUX_OR_ANDROID_LD (GNU_USER_TARGET_ENDFILE_SPEC, ANDROID_ENDFILE_SPEC)
57
58#undef LIB_SPEC
59#define LIB_SPEC  \
60  "%{pthread:-lpthread} \
61   %{shared:-lc} \
62   %{!shared:%{profile:-lc_p}%{!profile:-lc}}"
63
64#undef TARGET_ASM_FILE_END
65#define TARGET_ASM_FILE_END file_end_indicate_exec_stack
66
67/* No SDATA default for linux.  */
68#undef TARGET_SDATA_DEFAULT
69#define TARGET_SDATA_DEFAULT 0
70
71/* We have medium calls.  */
72#undef TARGET_MMEDIUM_CALLS_DEFAULT
73#define TARGET_MMEDIUM_CALLS_DEFAULT 1
74
75/* We do not have any MULTILIB_OPTIONS specified, so there are no
76   MULTILIB_DEFAULTS.  */
77#undef  MULTILIB_DEFAULTS
78
79/* Linux toolchains use r25 as the thread pointer register.  */
80#undef TARGET_ARC_TP_REGNO_DEFAULT
81#define TARGET_ARC_TP_REGNO_DEFAULT 25
82
83#undef SUBTARGET_CPP_SPEC
84#define SUBTARGET_CPP_SPEC "\
85   %{pthread:-D_REENTRANT} \
86"
87
88/* Indexed loads are default off.  */
89#undef TARGET_INDEXED_LOADS_DEFAULT
90#define TARGET_INDEXED_LOADS_DEFAULT 0
91
92/* Pre/post modify with register displacement are default off.  */
93#undef TARGET_AUTO_MODIFY_REG_DEFAULT
94#define TARGET_AUTO_MODIFY_REG_DEFAULT 0
95
96#if DEFAULT_LIBC == LIBC_GLIBC
97/* Override linux.h LINK_EH_SPEC definition.
98   Signalize that because we have fde-glibc, we don't need all C shared libs
99   linked against -lgcc_s.  */
100#undef LINK_EH_SPEC
101#define LINK_EH_SPEC "--eh-frame-hdr "
102#endif
103
104#undef SUBTARGET_CPP_SPEC
105#define SUBTARGET_CPP_SPEC "\
106   %{pthread:-D_REENTRANT} \
107"
108
109/* Build attribute: procedure call standard.  */
110#undef ATTRIBUTE_PCS
111#define ATTRIBUTE_PCS 3
112
113/* Clear the instruction cache from `beg' to `end'.  This makes an
114   inline system call to SYS_cacheflush.  */
115#undef CLEAR_INSN_CACHE
116#define CLEAR_INSN_CACHE(beg, end)					\
117{									\
118  register unsigned long _beg __asm ("r0") = (unsigned long) (beg);	\
119  register unsigned long _end __asm ("r1") = (unsigned long) (end);	\
120  register unsigned long _xtr __asm ("r2") = 0;				\
121  register unsigned long _scno __asm ("r8") = 244;			\
122  __asm __volatile ("trap_s 0		; sys_cache_sync"		\
123		    : "=r" (_beg)					\
124		    : "0" (_beg), "r" (_end), "r" (_xtr), "r" (_scno));	\
125}
126
127/* Emit rtl for profiling.  Output assembler code to FILE
128   to call "_mcount" for profiling a function entry.  */
129#define PROFILE_HOOK(LABEL)					\
130  {								\
131   rtx fun, rt;							\
132   rt = get_hard_reg_initial_val (Pmode, RETURN_ADDR_REGNUM);	\
133   fun = gen_rtx_SYMBOL_REF (Pmode, "_mcount");			\
134   emit_library_call (fun, LCT_NORMAL, VOIDmode, rt, Pmode);	\
135  }
136
137/* Enter/Leave ops are default off for linux targets.  */
138#undef TARGET_CODE_DENSITY_FRAME_DEFAULT
139#define TARGET_CODE_DENSITY_FRAME_DEFAULT 0
140