mirror of https://gitee.com/openkylin/qemu.git
77 lines
2.2 KiB
C
77 lines
2.2 KiB
C
/*
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* ARM Compatible Semihosting Console Support.
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*
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* Copyright (c) 2019 Linaro Ltd
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*
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* Currently ARM and RISC-V are unique in having support for
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* semihosting support in linux-user. So for now we implement the
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* common console API but just for arm and risc-v linux-user.
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "qemu/osdep.h"
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#include "cpu.h"
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#include "hw/semihosting/console.h"
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#include "qemu.h"
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#include <termios.h>
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int qemu_semihosting_console_outs(CPUArchState *env, target_ulong addr)
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{
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int len = target_strlen(addr);
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void *s;
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if (len < 0){
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qemu_log_mask(LOG_GUEST_ERROR,
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"%s: passed inaccessible address " TARGET_FMT_lx,
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__func__, addr);
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return 0;
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}
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s = lock_user(VERIFY_READ, addr, (long)(len + 1), 1);
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g_assert(s); /* target_strlen has already verified this will work */
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len = write(STDERR_FILENO, s, len);
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unlock_user(s, addr, 0);
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return len;
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}
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void qemu_semihosting_console_outc(CPUArchState *env, target_ulong addr)
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{
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char c;
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if (get_user_u8(c, addr)) {
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qemu_log_mask(LOG_GUEST_ERROR,
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"%s: passed inaccessible address " TARGET_FMT_lx,
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__func__, addr);
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} else {
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if (write(STDERR_FILENO, &c, 1) != 1) {
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qemu_log_mask(LOG_UNIMP, "%s: unexpected write to stdout failure",
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__func__);
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}
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}
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}
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/*
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* For linux-user we can safely block. However as we want to return as
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* soon as a character is read we need to tweak the termio to disable
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* line buffering. We restore the old mode afterwards in case the
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* program is expecting more normal behaviour. This is slow but
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* nothing using semihosting console reading is expecting to be fast.
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*/
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target_ulong qemu_semihosting_console_inc(CPUArchState *env)
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{
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uint8_t c;
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struct termios old_tio, new_tio;
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/* Disable line-buffering and echo */
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tcgetattr(STDIN_FILENO, &old_tio);
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new_tio = old_tio;
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new_tio.c_lflag &= (~ICANON & ~ECHO);
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tcsetattr(STDIN_FILENO, TCSANOW, &new_tio);
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c = getchar();
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/* restore config */
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tcsetattr(STDIN_FILENO, TCSANOW, &old_tio);
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return (target_ulong) c;
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}
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