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0dc07721 AB |
1 | /* |
2 | * ARM Semihosting Console Support | |
3 | * | |
4 | * Copyright (c) 2019 Linaro Ltd | |
5 | * | |
6 | * Currently ARM is unique in having support for semihosting support | |
7 | * in linux-user. So for now we implement the common console API but | |
8 | * just for arm linux-user. | |
9 | * | |
10 | * SPDX-License-Identifier: GPL-2.0-or-later | |
11 | */ | |
12 | ||
13 | #include "qemu/osdep.h" | |
14 | #include "cpu.h" | |
15 | #include "hw/semihosting/console.h" | |
16 | #include "qemu.h" | |
8de702cb | 17 | #include <termios.h> |
0dc07721 | 18 | |
78e24848 | 19 | int qemu_semihosting_console_outs(CPUArchState *env, target_ulong addr) |
0dc07721 | 20 | { |
78e24848 AB |
21 | int len = target_strlen(addr); |
22 | void *s; | |
23 | if (len < 0){ | |
24 | qemu_log_mask(LOG_GUEST_ERROR, | |
25 | "%s: passed inaccessible address " TARGET_FMT_lx, | |
26 | __func__, addr); | |
27 | return 0; | |
28 | } | |
29 | s = lock_user(VERIFY_READ, addr, (long)(len + 1), 1); | |
30 | g_assert(s); /* target_strlen has already verified this will work */ | |
31 | len = write(STDERR_FILENO, s, len); | |
0dc07721 AB |
32 | unlock_user(s, addr, 0); |
33 | return len; | |
34 | } | |
78e24848 AB |
35 | |
36 | void qemu_semihosting_console_outc(CPUArchState *env, target_ulong addr) | |
37 | { | |
38 | char c; | |
39 | ||
40 | if (get_user_u8(c, addr)) { | |
41 | qemu_log_mask(LOG_GUEST_ERROR, | |
42 | "%s: passed inaccessible address " TARGET_FMT_lx, | |
43 | __func__, addr); | |
44 | } else { | |
45 | if (write(STDERR_FILENO, &c, 1) != 1) { | |
46 | qemu_log_mask(LOG_UNIMP, "%s: unexpected write to stdout failure", | |
47 | __func__); | |
48 | } | |
49 | } | |
50 | } | |
8de702cb KP |
51 | |
52 | /* | |
53 | * For linux-user we can safely block. However as we want to return as | |
54 | * soon as a character is read we need to tweak the termio to disable | |
55 | * line buffering. We restore the old mode afterwards in case the | |
56 | * program is expecting more normal behaviour. This is slow but | |
57 | * nothing using semihosting console reading is expecting to be fast. | |
58 | */ | |
59 | target_ulong qemu_semihosting_console_inc(CPUArchState *env) | |
60 | { | |
61 | uint8_t c; | |
62 | struct termios old_tio, new_tio; | |
63 | ||
64 | /* Disable line-buffering and echo */ | |
65 | tcgetattr(STDIN_FILENO, &old_tio); | |
66 | new_tio = old_tio; | |
67 | new_tio.c_lflag &= (~ICANON & ~ECHO); | |
68 | tcsetattr(STDIN_FILENO, TCSANOW, &new_tio); | |
69 | ||
70 | c = getchar(); | |
71 | ||
72 | /* restore config */ | |
73 | tcsetattr(STDIN_FILENO, TCSANOW, &old_tio); | |
74 | ||
75 | return (target_ulong) c; | |
76 | } |