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picocrt: Add SuperH support
Signed-off-by: Keith Packard <[email protected]>
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‎picocrt/machine/sh/CMakeLists.txt

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#
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# SPDX-License-Identifier: BSD-3-Clause
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#
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# Copyright © 2022 Keith Packard
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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#
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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#
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# 2. Redistributions in binary form must reproduce the above
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# copyright notice, this list of conditions and the following
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# disclaimer in the documentation and/or other materials provided
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# with the distribution.
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#
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# 3. Neither the name of the copyright holder nor the names of its
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# contributors may be used to endorse or promote products derived
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# from this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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# COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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# INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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# STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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# OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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add_library(picocrt OBJECT crt0.c)
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add_library(picocrt-semihost OBJECT crt0.c)
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target_compile_options(picocrt PRIVATE ${PICOLIBC_COMPILE_OPTIONS})
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target_compile_options(picocrt-semihost PRIVATE -DCRT0_EXIT -DCRT0_SEMIHOST ${PICOLIBC_COMPILE_OPTIONS})
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target_include_directories(picocrt SYSTEM PUBLIC ${PICOLIBC_INCLUDE_DIRECTORIES})
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target_include_directories(picocrt-semihost SYSTEM PUBLIC ${PICOLIBC_INCLUDE_DIRECTORIES})
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‎picocrt/machine/sh/crt0.c

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/*
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright © 2019 Keith Packard
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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*
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* 3. Neither the name of the copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "../../crt0.h"
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static void __attribute__((used)) __section(".text.startup")
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_cstart(void)
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{
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__start();
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}
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extern char __stack[];
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#define FPSCR_FR (1 << 21)
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#define FPSCR_SZ (1 << 20)
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#define FPSCR_PR (1 << 19)
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#define FPSCR_DN (1 << 18)
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#define FPSCR_RN (0 << 0)
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#define FPSCR_RM (3 << 0)
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void __section(".init") __attribute__((used))
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_start(void)
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{
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/* Set up the stack pointer */
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__asm__("mov %0, r15" : : "r" (__stack));
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/* Initialize the FPU */
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#ifdef __SH_FPU_ANY__
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long fpscr;
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__asm__("sts fpscr,%0" : "=r" (fpscr));
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/* enable denorms */
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fpscr &= ~FPSCR_DN;
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/* set round to nearest */
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fpscr &= ~FPSCR_RM;
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fpscr |= FPSCR_RN;
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#ifdef __SH4__
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fpscr |= FPSCR_PR;
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#elif defined(__SH4_SINGLE_ONLY__)
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fpscr &= ~FPSCR_PR;
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#endif
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__asm__("lds %0,fpscr" : : "r" (fpscr));
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#endif
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/* Branch to C code */
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__asm__("jmp @%0" : : "r" (_cstart));
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/* Fill in any delay slot */
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__asm__("nop");
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}

‎picocrt/machine/sh/meson.build

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#
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# SPDX-License-Identifier: BSD-3-Clause
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#
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# Copyright © 2021 Keith Packard
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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#
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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#
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# 2. Redistributions in binary form must reproduce the above
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# copyright notice, this list of conditions and the following
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# disclaimer in the documentation and/or other materials provided
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# with the distribution.
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#
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# 3. Neither the name of the copyright holder nor the names of its
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# contributors may be used to endorse or promote products derived
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# from this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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# COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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# INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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# STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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# OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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src_picocrt += files('crt0.c')

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