1/* Target macros for arc*-*-linux targets.
2
3   Copyright (C) 2017-2020 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					\
33  "/lib/ld-linux-arc%{mbig-endian:eb}%{mcpu=arc700:700}.so.2"
34#define UCLIBC_DYNAMIC_LINKER  "/lib/ld-uClibc.so.0"
35
36/* Note that the default is to link against dynamic libraries, if they are
37   available.  Override with -static.  */
38#undef LINK_SPEC
39#define LINK_SPEC "%{h*} \
40  %{static:-Bstatic} \
41  %{shared:-shared} \
42  %{symbolic:-Bsymbolic} \
43  %{!static: \
44    %{rdynamic:-export-dynamic} \
45    %{!shared:-dynamic-linker " GNU_USER_DYNAMIC_LINKER "}} \
46  -X \
47  %{mbig-endian:-EB} %{EB} %{EL} \
48  %{!z:-z max-page-size=0x2000 -z common-page-size=0x2000} \
49  %{mcpu=nps400:-marclinux_nps; :-marclinux}"
50
51#undef STARTFILE_SPEC
52#define STARTFILE_SPEC							\
53  LINUX_OR_ANDROID_LD (GNU_USER_TARGET_STARTFILE_SPEC, ANDROID_STARTFILE_SPEC)
54
55#undef ENDFILE_SPEC
56#define ENDFILE_SPEC							\
57  LINUX_OR_ANDROID_LD (GNU_USER_TARGET_ENDFILE_SPEC, ANDROID_ENDFILE_SPEC)
58
59#undef LIB_SPEC
60#define LIB_SPEC  \
61  "%{pthread:-lpthread} \
62   %{shared:-lc} \
63   %{!shared:%{profile:-lc_p}%{!profile:-lc}}"
64
65#undef TARGET_ASM_FILE_END
66#define TARGET_ASM_FILE_END file_end_indicate_exec_stack
67
68/* No SDATA default for linux.  */
69#undef TARGET_SDATA_DEFAULT
70#define TARGET_SDATA_DEFAULT 0
71
72/* We have medium calls.  */
73#undef TARGET_MMEDIUM_CALLS_DEFAULT
74#define TARGET_MMEDIUM_CALLS_DEFAULT 1
75
76/* We do not have any MULTILIB_OPTIONS specified, so there are no
77   MULTILIB_DEFAULTS.  */
78#undef  MULTILIB_DEFAULTS
79
80/* Linux toolchains use r25 as the thread pointer register.  */
81#undef TARGET_ARC_TP_REGNO_DEFAULT
82#define TARGET_ARC_TP_REGNO_DEFAULT 25
83
84#undef SUBTARGET_CPP_SPEC
85#define SUBTARGET_CPP_SPEC "\
86   %{pthread:-D_REENTRANT} \
87"
88
89/* Indexed loads are default off.  */
90#undef TARGET_INDEXED_LOADS_DEFAULT
91#define TARGET_INDEXED_LOADS_DEFAULT 0
92
93/* Pre/post modify with register displacement are default off.  */
94#undef TARGET_AUTO_MODIFY_REG_DEFAULT
95#define TARGET_AUTO_MODIFY_REG_DEFAULT 0
96
97#if DEFAULT_LIBC == LIBC_GLIBC
98/* Override linux.h LINK_EH_SPEC definition.
99   Signalize that because we have fde-glibc, we don't need all C shared libs
100   linked against -lgcc_s.  */
101#undef LINK_EH_SPEC
102#define LINK_EH_SPEC "--eh-frame-hdr "
103#endif
104
105#undef SUBTARGET_CPP_SPEC
106#define SUBTARGET_CPP_SPEC "\
107   %{pthread:-D_REENTRANT} \
108"
109
110/* Build attribute: procedure call standard.  */
111#undef ATTRIBUTE_PCS
112#define ATTRIBUTE_PCS 3
113
114/* Clear the instruction cache from `beg' to `end'.  This makes an
115   inline system call to SYS_cacheflush.  */
116#undef CLEAR_INSN_CACHE
117#define CLEAR_INSN_CACHE(beg, end)					\
118{									\
119  register unsigned long _beg __asm ("r0") = (unsigned long) (beg);	\
120  register unsigned long _end __asm ("r1") = (unsigned long) (end);	\
121  register unsigned long _xtr __asm ("r2") = 0;				\
122  register unsigned long _scno __asm ("r8") = 244;			\
123  __asm __volatile ("trap_s 0		; sys_cache_sync"		\
124		    : "=r" (_beg)					\
125		    : "0" (_beg), "r" (_end), "r" (_xtr), "r" (_scno));	\
126}
127
128/* Emit rtl for profiling.  Output assembler code to FILE
129   to call "_mcount" for profiling a function entry.  */
130#define PROFILE_HOOK(LABEL)					\
131  {								\
132   rtx fun, rt;							\
133   rt = get_hard_reg_initial_val (Pmode, RETURN_ADDR_REGNUM);	\
134   fun = gen_rtx_SYMBOL_REF (Pmode, "_mcount");			\
135   emit_library_call (fun, LCT_NORMAL, VOIDmode, rt, Pmode);	\
136  }
137
138/* Enter/Leave ops are default off for linux targets.  */
139#undef TARGET_CODE_DENSITY_FRAME_DEFAULT
140#define TARGET_CODE_DENSITY_FRAME_DEFAULT 0
141