156b5170cSKeith Packard /* 2a10b9d93SKeith Packard * ARM Compatible Semihosting Console Support. 356b5170cSKeith Packard * 456b5170cSKeith Packard * Copyright (c) 2019 Linaro Ltd 556b5170cSKeith Packard * 6a10b9d93SKeith Packard * Currently ARM and RISC-V are unique in having support for 7a10b9d93SKeith Packard * semihosting support in linux-user. So for now we implement the 8a10b9d93SKeith Packard * common console API but just for arm and risc-v linux-user. 956b5170cSKeith Packard * 1056b5170cSKeith Packard * SPDX-License-Identifier: GPL-2.0-or-later 1156b5170cSKeith Packard */ 1256b5170cSKeith Packard 1356b5170cSKeith Packard #include "qemu/osdep.h" 146b5fe137SPhilippe Mathieu-Daudé #include "semihosting/console.h" 1556b5170cSKeith Packard #include "qemu.h" 16*3b249d26SPeter Maydell #include "user-internals.h" 1756b5170cSKeith Packard #include <termios.h> 1856b5170cSKeith Packard 1956b5170cSKeith Packard int qemu_semihosting_console_outs(CPUArchState *env, target_ulong addr) 2056b5170cSKeith Packard { 2156b5170cSKeith Packard int len = target_strlen(addr); 2256b5170cSKeith Packard void *s; 2356b5170cSKeith Packard if (len < 0){ 2456b5170cSKeith Packard qemu_log_mask(LOG_GUEST_ERROR, 2556b5170cSKeith Packard "%s: passed inaccessible address " TARGET_FMT_lx, 2656b5170cSKeith Packard __func__, addr); 2756b5170cSKeith Packard return 0; 2856b5170cSKeith Packard } 2956b5170cSKeith Packard s = lock_user(VERIFY_READ, addr, (long)(len + 1), 1); 3056b5170cSKeith Packard g_assert(s); /* target_strlen has already verified this will work */ 3156b5170cSKeith Packard len = write(STDERR_FILENO, s, len); 3256b5170cSKeith Packard unlock_user(s, addr, 0); 3356b5170cSKeith Packard return len; 3456b5170cSKeith Packard } 3556b5170cSKeith Packard 3656b5170cSKeith Packard void qemu_semihosting_console_outc(CPUArchState *env, target_ulong addr) 3756b5170cSKeith Packard { 3856b5170cSKeith Packard char c; 3956b5170cSKeith Packard 4056b5170cSKeith Packard if (get_user_u8(c, addr)) { 4156b5170cSKeith Packard qemu_log_mask(LOG_GUEST_ERROR, 4256b5170cSKeith Packard "%s: passed inaccessible address " TARGET_FMT_lx, 4356b5170cSKeith Packard __func__, addr); 4456b5170cSKeith Packard } else { 4556b5170cSKeith Packard if (write(STDERR_FILENO, &c, 1) != 1) { 4656b5170cSKeith Packard qemu_log_mask(LOG_UNIMP, "%s: unexpected write to stdout failure", 4756b5170cSKeith Packard __func__); 4856b5170cSKeith Packard } 4956b5170cSKeith Packard } 5056b5170cSKeith Packard } 5156b5170cSKeith Packard 5256b5170cSKeith Packard /* 5356b5170cSKeith Packard * For linux-user we can safely block. However as we want to return as 5456b5170cSKeith Packard * soon as a character is read we need to tweak the termio to disable 5556b5170cSKeith Packard * line buffering. We restore the old mode afterwards in case the 5656b5170cSKeith Packard * program is expecting more normal behaviour. This is slow but 5756b5170cSKeith Packard * nothing using semihosting console reading is expecting to be fast. 5856b5170cSKeith Packard */ 5956b5170cSKeith Packard target_ulong qemu_semihosting_console_inc(CPUArchState *env) 6056b5170cSKeith Packard { 6156b5170cSKeith Packard uint8_t c; 6256b5170cSKeith Packard struct termios old_tio, new_tio; 6356b5170cSKeith Packard 6456b5170cSKeith Packard /* Disable line-buffering and echo */ 6556b5170cSKeith Packard tcgetattr(STDIN_FILENO, &old_tio); 6656b5170cSKeith Packard new_tio = old_tio; 6756b5170cSKeith Packard new_tio.c_lflag &= (~ICANON & ~ECHO); 6856b5170cSKeith Packard tcsetattr(STDIN_FILENO, TCSANOW, &new_tio); 6956b5170cSKeith Packard 7056b5170cSKeith Packard c = getchar(); 7156b5170cSKeith Packard 7256b5170cSKeith Packard /* restore config */ 7356b5170cSKeith Packard tcsetattr(STDIN_FILENO, TCSANOW, &old_tio); 7456b5170cSKeith Packard 7556b5170cSKeith Packard return (target_ulong) c; 7656b5170cSKeith Packard } 77