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Commit | Line | Data |
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0dc07721 | 1 | /* |
a10b9d93 | 2 | * ARM Compatible Semihosting Console Support. |
0dc07721 AB |
3 | * |
4 | * Copyright (c) 2019 Linaro Ltd | |
5 | * | |
a10b9d93 KP |
6 | * Currently ARM and RISC-V are unique in having support for |
7 | * semihosting support in linux-user. So for now we implement the | |
8 | * common console API but just for arm and risc-v linux-user. | |
0dc07721 AB |
9 | * |
10 | * SPDX-License-Identifier: GPL-2.0-or-later | |
11 | */ | |
12 | ||
13 | #include "qemu/osdep.h" | |
6b5fe137 | 14 | #include "semihosting/console.h" |
0dc07721 | 15 | #include "qemu.h" |
3b249d26 | 16 | #include "user-internals.h" |
8de702cb | 17 | #include <termios.h> |
0dc07721 | 18 | |
8de702cb KP |
19 | /* |
20 | * For linux-user we can safely block. However as we want to return as | |
21 | * soon as a character is read we need to tweak the termio to disable | |
22 | * line buffering. We restore the old mode afterwards in case the | |
23 | * program is expecting more normal behaviour. This is slow but | |
24 | * nothing using semihosting console reading is expecting to be fast. | |
25 | */ | |
e7fb6f32 | 26 | int qemu_semihosting_console_read(CPUState *cs, void *buf, int len) |
8de702cb | 27 | { |
e7fb6f32 | 28 | int ret; |
8de702cb KP |
29 | struct termios old_tio, new_tio; |
30 | ||
31 | /* Disable line-buffering and echo */ | |
32 | tcgetattr(STDIN_FILENO, &old_tio); | |
33 | new_tio = old_tio; | |
34 | new_tio.c_lflag &= (~ICANON & ~ECHO); | |
e7fb6f32 RH |
35 | new_tio.c_cc[VMIN] = 1; |
36 | new_tio.c_cc[VTIME] = 0; | |
8de702cb KP |
37 | tcsetattr(STDIN_FILENO, TCSANOW, &new_tio); |
38 | ||
e7fb6f32 | 39 | ret = fread(buf, 1, len, stdin); |
8de702cb KP |
40 | |
41 | /* restore config */ | |
42 | tcsetattr(STDIN_FILENO, TCSANOW, &old_tio); | |
43 | ||
e7fb6f32 | 44 | return ret; |
8de702cb | 45 | } |
cd66f20f RH |
46 | |
47 | int qemu_semihosting_console_write(void *buf, int len) | |
48 | { | |
49 | return fwrite(buf, 1, len, stderr); | |
50 | } |