semihosting: Move ARM semihosting code to shared directories

This commit renames two files which provide ARM semihosting support so
that they can be shared by other architectures:

 1. target/arm/arm-semi.c     -> hw/semihosting/common-semi.c
 2. linux-user/arm/semihost.c -> linux-user/semihost.c

The build system was modified use a new config variable,
CONFIG_ARM_COMPATIBLE_SEMIHOSTING, which has been added to the ARM
softmmu and linux-user default configs. The contents of the source
files has not been changed in this patch.

Signed-off-by: Keith Packard <keithp@keithp.com>
[AJB: rename arm-compat-semi, select SEMIHOSTING]
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20210107170717.2098982-2-keithp@keithp.com>
Message-Id: <20210108224256.2321-13-alex.bennee@linaro.org>

2 files changed, 0 insertions, 79 deletions

diff --git a/linux-user/arm/meson.build b/linux-user/arm/meson.build
index 432984b..5a93c92 100644
--- a/linux-user/arm/meson.build
+++ b/linux-user/arm/meson.build
@@ -1,6 +1,3 @@
-linux_user_ss.add(when: 'TARGET_AARCH64', if_true: files('semihost.c'))
-linux_user_ss.add(when: 'TARGET_ARM', if_true: files('semihost.c'))
-
 subdir('nwfpe')
 
 syscall_nr_generators += {
diff --git a/linux-user/arm/semihost.c b/linux-user/arm/semihost.c
deleted file mode 100644
index a1f0f60..0000000
--- a/linux-user/arm/semihost.c
+++ /dev/null
@@ -1,76 +0,0 @@
-/*
- * ARM Semihosting Console Support
- *
- * Copyright (c) 2019 Linaro Ltd
- *
- * Currently ARM is unique in having support for semihosting support
- * in linux-user. So for now we implement the common console API but
- * just for arm linux-user.
- *
- * SPDX-License-Identifier: GPL-2.0-or-later
- */
-
-#include "qemu/osdep.h"
-#include "cpu.h"
-#include "hw/semihosting/console.h"
-#include "qemu.h"
-#include <termios.h>
-
-int qemu_semihosting_console_outs(CPUArchState *env, target_ulong addr)
-{
-    int len = target_strlen(addr);
-    void *s;
-    if (len < 0){
-       qemu_log_mask(LOG_GUEST_ERROR,
-                     "%s: passed inaccessible address " TARGET_FMT_lx,
-                     __func__, addr);
-       return 0;
-    }
-    s = lock_user(VERIFY_READ, addr, (long)(len + 1), 1);
-    g_assert(s);  /* target_strlen has already verified this will work */
-    len = write(STDERR_FILENO, s, len);
-    unlock_user(s, addr, 0);
-    return len;
-}
-
-void qemu_semihosting_console_outc(CPUArchState *env, target_ulong addr)
-{
-    char c;
-
-    if (get_user_u8(c, addr)) {
-        qemu_log_mask(LOG_GUEST_ERROR,
-                      "%s: passed inaccessible address " TARGET_FMT_lx,
-                      __func__, addr);
-    } else {
-        if (write(STDERR_FILENO, &c, 1) != 1) {
-            qemu_log_mask(LOG_UNIMP, "%s: unexpected write to stdout failure",
-                          __func__);
-        }
-    }
-}
-
-/*
- * For linux-user we can safely block. However as we want to return as
- * soon as a character is read we need to tweak the termio to disable
- * line buffering. We restore the old mode afterwards in case the
- * program is expecting more normal behaviour. This is slow but
- * nothing using semihosting console reading is expecting to be fast.
- */
-target_ulong qemu_semihosting_console_inc(CPUArchState *env)
-{
-    uint8_t c;
-    struct termios old_tio, new_tio;
-
-    /* Disable line-buffering and echo */
-    tcgetattr(STDIN_FILENO, &old_tio);
-    new_tio = old_tio;
-    new_tio.c_lflag &= (~ICANON & ~ECHO);
-    tcsetattr(STDIN_FILENO, TCSANOW, &new_tio);
-
-    c = getchar();
-
-    /* restore config */
-    tcsetattr(STDIN_FILENO, TCSANOW, &old_tio);
-
-    return (target_ulong) c;
-}