1 /* Definitions of ELF target support for Altera Nios II. 2 Copyright (C) 2012-2020 Free Software Foundation, Inc. 3 Contributed by Jonah Graham (jgraham@altera.com), 4 Will Reece (wreece@altera.com), and Jeff DaSilva (jdasilva@altera.com). 5 Contributed by Mentor Graphics, Inc. 6 7 This file is part of GCC. 8 9 GCC is free software; you can redistribute it and/or modify it 10 under the terms of the GNU General Public License as published 11 by the Free Software Foundation; either version 3, or (at your 12 option) any later version. 13 14 GCC is distributed in the hope that it will be useful, but WITHOUT 15 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 16 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public 17 License for more details. 18 19 You should have received a copy of the GNU General Public License 20 along with GCC; see the file COPYING3. If not see 21 <http://www.gnu.org/licenses/>. */ 22 23 24 /* Specs to support the additional command-line options for Nios II ELF 25 toolchains. */ 26 27 /* -msmallc chooses an alternate C library. 28 -msys-lib= specifies an additional low-level system/hosting library and 29 is typically used to suck in a library provided by a HAL BSP. */ 30 #undef LIB_SPEC 31 #define LIB_SPEC \ 32 "--start-group %{msmallc: -lsmallc} %{!msmallc: -lc} -lgcc \ 33 %{msys-lib=*: -l%*} \ 34 --end-group \ 35 " 36 37 /* Linking with -mhal suppresses inclusion of the GCC-provided crt* begin/end 38 code. Normally in this case you also link with -msys-crt0= to specify 39 the startup code provided by the HAL BSP instead. */ 40 #undef STARTFILE_SPEC 41 #define STARTFILE_SPEC \ 42 "%{mhal:" \ 43 "%{msys-crt0=*:%*} %{!msys-crt0=*:crt0%O%s} " \ 44 "%{msys-crt0=:%eYou need a C startup file for -msys-crt0=};" \ 45 ":crti%O%s crtbegin%O%s}" 46 47 #undef ENDFILE_SPEC 48 #define ENDFILE_SPEC "%{!mhal:crtend%O%s crtn%O%s}" 49 50 /* The ELF target doesn't support the Nios II Linux ABI. */ 51 #define TARGET_LINUX_ABI 0 52 53 /* Default -fdelete-null-pointer-checks to off, to prevent the compiler 54 from treating accesses to address zero as traps. On bare-metal Nios II 55 targets address zero may legitimately be mapped to memory (e.g., the 56 hardware description may specify this as the address of the interrupt 57 vector). Users can override this on the command line to get the 58 additional optimizations it enables. */ 59 #define SUBTARGET_OVERRIDE_OPTIONS \ 60 if (flag_delete_null_pointer_checks < 0) \ 61 flag_delete_null_pointer_checks = 0 62