a10b9d93ec
Adapt the arm semihosting support code for RISCV. This implementation is based on the standard for RISC-V semihosting version 0.2 as documented in https://github.com/riscv/riscv-semihosting-spec/releases/tag/0.2 Signed-off-by: Keith Packard <keithp@keithp.com> Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Reviewed-by: Alistair Francis <alistair.francis@wdc.com> Message-Id: <20210107170717.2098982-6-keithp@keithp.com> Message-Id: <20210108224256.2321-17-alex.bennee@linaro.org>
77 lines
2.2 KiB
C
77 lines
2.2 KiB
C
/*
|
|
* ARM Compatible Semihosting Console Support.
|
|
*
|
|
* Copyright (c) 2019 Linaro Ltd
|
|
*
|
|
* Currently ARM and RISC-V are unique in having support for
|
|
* semihosting support in linux-user. So for now we implement the
|
|
* common console API but just for arm and risc-v 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;
|
|
}
|