arm: 0.905
graphic: 0.900
architecture: 0.863
performance: 0.850
device: 0.834
files: 0.713
permissions: 0.616
debug: 0.600
semantic: 0.599
vnc: 0.531
network: 0.513
ppc: 0.502
socket: 0.452
PID: 0.357
TCG: 0.352
mistranslation: 0.340
risc-v: 0.330
kernel: 0.324
boot: 0.319
peripherals: 0.314
VMM: 0.305
x86: 0.281
user-level: 0.278
i386: 0.276
virtual: 0.211
hypervisor: 0.194
register: 0.185
KVM: 0.093
assembly: 0.073
--------------------
arm: 0.978
debug: 0.592
register: 0.498
assembly: 0.484
virtual: 0.258
TCG: 0.071
files: 0.068
semantic: 0.039
user-level: 0.023
performance: 0.020
PID: 0.012
kernel: 0.009
network: 0.008
device: 0.006
hypervisor: 0.004
graphic: 0.004
peripherals: 0.003
architecture: 0.003
boot: 0.003
socket: 0.002
permissions: 0.001
VMM: 0.001
risc-v: 0.001
ppc: 0.001
mistranslation: 0.001
x86: 0.001
vnc: 0.001
i386: 0.000
KVM: 0.000

EOF is not detected, when semihosting is reading from stdin
Description of problem:
QEMU hangs.
Steps to reproduce:
1. Run the program with stdin from a pipe.
Additional information:
The code is compiled from this source:
```
#include <stdio.h>

int main(int argc, char** argv) {
    int i = -1;
    int result = scanf("%d", &i);
    printf("result = %d, i = %d\n", result, i);
    return 0;
}
```
compiled with GCC and picolibc:
```
arm-none-eabi-gcc --specs=picolibc.specs -march=armv7-m ~/sources/picolibc/git/test-stdin.c -o test-stdin -lc -lsemihost --crt0=hosted -O0 -g
```
[test-stdin](/uploads/dbd2650c8e0aaca353fd7630ac9c8440/test-stdin)
The execution hangs at semihosting SYS_READC(0x7) call:
```
	movs r0, #7
(...)
	bkpt #0xab
```