shared/runtime/semihosting: Rename ARM semihosting files.

Make room for RISC-V semihosting code, by renaming the existing
`semihosting.[ch]` files into `semihosting_arm.[ch]`.

Signed-off-by: Alessandro Gatti <a.gatti@frob.it>

1 files changed, 0 insertions, 132 deletions

diff --git a/shared/runtime/semihosting.c b/shared/runtime/semihosting.c
deleted file mode 100644
index 18c7f5d57a..0000000000
--- a/shared/runtime/semihosting.c
+++ /dev/null
@@ -1,132 +0,0 @@
-/*
- * This file is part of the MicroPython project, http://micropython.org/
- *
- * The MIT License (MIT)
- *
- * Copyright (c) 2018 Ayke van Laethem
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- */
-
-#include "semihosting.h"
-
-// Resources:
-// http://embed.rs/articles/2016/semi-hosting-rust/
-// https://wiki.dlang.org/Minimal_semihosted_ARM_Cortex-M_%22Hello_World%22
-// https://github.com/arduino/OpenOCD/blob/master/src/target/arm_semihosting.c
-
-#define SYS_OPEN   0x01
-#define SYS_WRITEC 0x03
-#define SYS_WRITE  0x05
-#define SYS_READC  0x07
-
-// Constants:
-#define OPEN_MODE_READ  (0) // mode "r"
-#define OPEN_MODE_WRITE (4) // mode "w"
-
-#ifndef __thumb__
-#error Semihosting is only implemented for ARM microcontrollers.
-#endif
-
-static int mp_semihosting_stdout;
-
-static uint32_t mp_semihosting_call(uint32_t num, const void *arg) {
-    // A semihosting call works as follows, similar to a SVCall:
-    //   * the call is invoked by a special breakpoint: 0xAB
-    //   * the command is placed in r0
-    //   * a pointer to the arguments is placed in r1
-    //   * the return value is placed in r0
-    // Note that because it uses the breakpoint instruction, applications
-    // will hang if they're not connected to a debugger. And they'll be
-    // stuck in a breakpoint if semihosting is not specifically enabled in
-    // the debugger.
-    // Also note that semihosting is extremely slow (sometimes >100ms per
-    // call).
-    register uint32_t num_reg __asm__ ("r0") = num;
-    register const void *args_reg __asm__ ("r1") = arg;
-    __asm__ __volatile__ (
-        "bkpt 0xAB\n"         // invoke semihosting call
-        : "+r" (num_reg)      // call number and result
-        : "r" (args_reg)      // arguments
-        : "memory");          // make sure args aren't optimized away
-    return num_reg; // r0, which became the result
-}
-
-static int mp_semihosting_open_console(uint32_t mode) {
-    struct {
-        char *name;
-        uint32_t mode;
-        uint32_t name_len;
-    } args = {
-        .name = ":tt",     // magic path to console
-        .mode = mode,      // e.g. "r", "w" (see OPEN_MODE_* constants)
-        .name_len = 3,     // strlen(":tt")
-    };
-    return mp_semihosting_call(SYS_OPEN, &args);
-}
-
-void mp_semihosting_init() {
-    mp_semihosting_stdout = mp_semihosting_open_console(OPEN_MODE_WRITE);
-}
-
-int mp_semihosting_rx_char() {
-    return mp_semihosting_call(SYS_READC, NULL);
-}
-
-static void mp_semihosting_tx_char(char c) {
-    mp_semihosting_call(SYS_WRITEC, &c);
-}
-
-uint32_t mp_semihosting_tx_strn(const char *str, size_t len) {
-    if (len == 0) {
-        return 0; // nothing to do
-    }
-    if (len == 1) {
-        mp_semihosting_tx_char(*str); // maybe faster?
-        return 0;
-    }
-
-    struct {
-        uint32_t fd;
-        const char *str;
-        uint32_t len;
-    } args = {
-        .fd = mp_semihosting_stdout,
-        .str = str,
-        .len = len,
-    };
-    return mp_semihosting_call(SYS_WRITE, &args);
-}
-
-uint32_t mp_semihosting_tx_strn_cooked(const char *str, size_t len) {
-    // Write chunks of data until (excluding) the first '\n' character,
-    // insert a '\r' character, and then continue with the next chunk
-    // (starting with '\n').
-    // Doing byte-by-byte writes would be easier to implement but is far
-    // too slow.
-    size_t start = 0;
-    for (size_t i = 0; i < len; i++) {
-        if (str[i] == '\n') {
-            mp_semihosting_tx_strn(str + start, i - start);
-            mp_semihosting_tx_char('\r');
-            start = i;
-        }
-    }
-    return mp_semihosting_tx_strn(str + start, len - start);
-}