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semihost: Add rudimentary support for openrisc
This has basic stdio support and _exit, with stdio using the 16550 uart and _exit using the sifive_test device. Signed-off-by: Keith Packard <[email protected]>
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‎semihost/machine/or1k/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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lib_semihost_srcs = [
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'or1k_stub.c',
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'or1k_exit.c',
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'or1k_iob.c',
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]
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has_semihost = true
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foreach params : targets
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target = params['name']
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target_dir = params['dir']
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target_c_args = params['c_args']
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target_lib_prefix = params['lib_prefix']
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instdir = join_paths(lib_dir, target_dir)
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libsemihost_name = 'semihost'
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local_lib_semihost_target = static_library(join_paths(target_dir, target_lib_prefix + libsemihost_name),
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lib_semihost_srcs,
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install : true,
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install_dir : instdir,
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include_directories : inc,
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c_args : target_c_args + c_args,
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pic: false)
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set_variable('lib_semihost' + target, local_lib_semihost_target)
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endforeach
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‎semihost/machine/or1k/or1k_exit.c‎

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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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#include "or1k_semihost.h"
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#define sifive_test (*((volatile uint32_t*) 0x96000000))
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#define FINISHER_FAIL 0x3333
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#define FINISHER_PASS 0x5555
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#define FINISHER_RESET 0x7777
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_Noreturn void
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_exit(int code)
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{
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uint32_t val;
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if (code == 0)
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val = FINISHER_PASS;
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else
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val = FINISHER_FAIL | (code << 16);
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sifive_test = val;
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while (1);
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}

‎semihost/machine/or1k/or1k_iob.c‎

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/*
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright © 2023 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 "or1k_semihost.h"
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typedef volatile uint8_t vuint8_t;
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struct uart_16550 {
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vuint8_t data;
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vuint8_t ier;
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vuint8_t iir;
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vuint8_t lcr;
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vuint8_t mcr;
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vuint8_t lsr;
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vuint8_t msr;
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vuint8_t scr;
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};
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/* openrisc virt serial port */
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#define uart (*((struct uart_16550 *) 0x90000000))
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#define UART_LSR_FIFOE 0x80 /* Fifo error */
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#define UART_LSR_TEMT 0x40 /* Transmitter empty */
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#define UART_LSR_THRE 0x20 /* Transmit-hold-register empty */
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#define UART_LSR_BI 0x10 /* Break interrupt indicator */
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#define UART_LSR_FE 0x08 /* Frame error indicator */
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#define UART_LSR_PE 0x04 /* Parity error indicator */
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#define UART_LSR_OE 0x02 /* Overrun error indicator */
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#define UART_LSR_DR 0x01 /* Receiver data ready */
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int
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or1k_putc(char c, FILE *file)
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{
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(void) file;
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while ((uart.lsr & (UART_LSR_TEMT|UART_LSR_THRE)) != (UART_LSR_TEMT|UART_LSR_THRE))
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;
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uart.data = (uint8_t) c;
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return (unsigned char) c;
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}
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#ifdef TINY_STDIO
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static int
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or1k_getc(FILE *file)
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{
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(void) file;
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return EOF;
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}
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static FILE __stdio = FDEV_SETUP_STREAM(or1k_putc, or1k_getc, NULL, _FDEV_SETUP_RW);
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#ifdef __strong_reference
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#define STDIO_ALIAS(x) __strong_reference(stdin, x);
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#else
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#define STDIO_ALIAS(x) FILE *const x = &__stdio;
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#endif
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FILE *const stdin = &__stdio;
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STDIO_ALIAS(stdout);
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STDIO_ALIAS(stderr);
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#endif

‎semihost/machine/or1k/or1k_semihost.h‎

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/*
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright © 2023 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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#ifndef _OR1K_SEMIHOST_H_
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#define _OR1K_SEMIHOST_H_
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/stat.h>
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int
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or1k_putc(char c, FILE *file);
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#endif /* _OR1K_SEMIHOST_H_ */

‎semihost/machine/or1k/or1k_stub.c‎

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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:
9+
*
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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
14+
* copyright notice, this list of conditions and the following
15+
* disclaimer in the documentation and/or other materials provided
16+
* with the distribution.
17+
*
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* 3. Neither the name of the copyright holder nor the names of its
19+
* contributors may be used to endorse or promote products derived
20+
* from this software without specific prior written permission.
21+
*
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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
28+
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
29+
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30+
* 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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#define _GNU_SOURCE
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#include "or1k_semihost.h"
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ssize_t
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read(int fd, void *buf, size_t count)
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{
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(void) fd;
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(void) buf;
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(void) count;
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return 0;
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}
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ssize_t
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write(int fd, const void *buf, size_t count)
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{
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const char *b = buf;
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size_t c = count;
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(void) fd;
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while (c--)
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or1k_putc(*b++, NULL);
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return count;
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}
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int
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open(const char *pathname, int flags, ...)
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{
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(void) pathname;
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(void) flags;
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return -1;
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}
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int
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close(int fd)
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{
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(void) fd;
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return 0;
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}
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off_t lseek(int fd, off_t offset, int whence)
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{
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(void) fd;
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(void) offset;
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(void) whence;
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return (off_t) -1;
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}
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_off64_t lseek64(int fd, _off64_t offset, int whence)
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{
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return (_off64_t) lseek(fd, (off_t) offset, whence);
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}
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int
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unlink(const char *pathname)
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{
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(void) pathname;
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return 0;
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}
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int
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fstat (int fd, struct stat *sbuf)
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{
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(void) fd;
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(void) sbuf;
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return -1;
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}
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int
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isatty (int fd)
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{
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(void) fd;
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return 1;
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}

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