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-rw-r--r--linux-user/arm/semihost.c27
1 files changed, 27 insertions, 0 deletions
diff --git a/linux-user/arm/semihost.c b/linux-user/arm/semihost.c
index a16b525..a1f0f60 100644
--- a/linux-user/arm/semihost.c
+++ b/linux-user/arm/semihost.c
@@ -14,6 +14,7 @@
#include "cpu.h"
#include "hw/semihosting/console.h"
#include "qemu.h"
+#include <termios.h>
int qemu_semihosting_console_outs(CPUArchState *env, target_ulong addr)
{
@@ -47,3 +48,29 @@ void qemu_semihosting_console_outc(CPUArchState *env, target_ulong addr)
}
}
}
+
+/*
+ * 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;
+}