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+
+RISC-V exit via sifive_test does not work in scripts with -serial stdio
+Description of problem:
+
+Steps to reproduce:
+1. Create assembly file `hello.s`:
+```as
+.section .text
+.globl _start
+_start: csrr t0, mhartid
+        bnez t0, _start
+        li t0, 0x100000
+        li t1, 0x5555
+        sw t1, 0(t0)
+halt:   j halt
+```
+2. Create linker script `link.ld`:
+```ld
+OUTPUT_ARCH( "riscv" )
+ENTRY(_start)
+SECTIONS
+{
+    . = 0x80000000;
+}
+```
+3. Create runner script `./run.sh` (don't forget to `chmod +x`)
+```sh
+#!/usr/bin/env bash
+timeout 10 qemu-system-riscv64 -M virt -display none -serial stdio -bios none -kernel hello
+```
+4. Compile into executable:
+```sh
+riscv64-unknown-elf-gcc -c -mcmodel=medany -fvisibility=hidden -nostartfiles -march=rv64g -mabi=lp64 -o hello.o hello.s
+riscv64-unknown-elf-ld hello.o -nostdlib -T link.ld -o hello
+```
+5. Dot-source the script - it will immediately exit cleanly
+6. Execute the script - it will timeout with exit code 124
+7. Execute the script with redirected stdin, e.g. `./run.sh < ./run.sh` or `echo | ./run.sh` - it will immediately exit cleanly
+Additional information:
+This issue happens only with `-serial stdio`. Using `chardev:file` or `chardev:null` does not reproduce the issue. Process substitution like `<(echo 'test')` does not seem to work. `cat | ./run.sh` will wait until any line is send, then exit cleanly. This is mainly an issue when using helper test scripts which want to interact with user, as proper CI/UT would redirect serial anyways.
+
+I have noticed similar behavior with other RISC-V UART device - when running from scripts, there is no output, as if QEMU was waiting for something, even if there is only UART TX, not RX. It does not matter if I actually type in anything or not.