Thanks a lot! I will check it out.

----
Bruno Prado


On Wed, Oct 21, 2020 at 12:45 PM Alex Bennée <alex.bennee@linaro.org> wrote:

>
> Bruno Prado <bruno@dcomp.ufs.br> writes:
>
> > Hello, is it really a bug?
> >
> > ----
> > Bruno Prado
> >
> >
> > On Fri, Oct 2, 2020 at 8:09 AM Bruno Prado <bruno@dcomp.ufs.br> wrote:
> >
> >> I am including some syscall functions:
> >>
> >> int _fstat(int file, struct stat* st) {
> >>        register int value asm("r0");
> >>        uint32_t p[] = { file };
> >>        R0(0x0C);
> >>        R1(p);
> >>        BKPT();
> >>        return value;
> >> }
> >>
> >> int _read(int file, char* ptr, int len) {
> >>        register int value asm("r0");
> >>        uint32_t p[] = { file, (uint32_t)(ptr), len };
> >>        R0(0x06);
> >>        R1(p);
> >>        BKPT();
> >>        return value;
> >> }
> >>
> >> int _write(int file, char* ptr, int len) {
> >>        register int value asm("r0");
> >>        uint32_t p[] = { file, (uint32_t)(ptr), len };
> >>        R0(0x05);
> >>        R1(p);
> >>        BKPT();
> >>        return value;
> >> }
> >>
> >> Also the interruption output from execution:
> >>
> >> $ qemu-system-arm -M netduino2 -nographic -semihosting -kernel vp2.bin
> -d
> >> int
> >> Taking exception 16 [Semihosting call]
> >> ...handling as semihosting call 0x1
> >> Taking exception 16 [Semihosting call]
> >> ...handling as semihosting call 0x1
> >> Taking exception 16 [Semihosting call]
> >> ...handling as semihosting call 0x1
> >> Taking exception 16 [Semihosting call]
> >> ...handling as semihosting call 0x1
> >> Taking exception 16 [Semihosting call]
> >> ...handling as semihosting call 0xc
> >> Taking exception 16 [Semihosting call]
> >> ...handling as semihosting call 0x5
> >> What is your name?
> >> Taking exception 16 [Semihosting call]
> >> ...handling as semihosting call 0x5
> >> Reading from file...
> >> Taking exception 16 [Semihosting call]
> >> ...handling as semihosting call 0xc
> >> Taking exception 16 [Semihosting call]
> >> ...handling as semihosting call 0x6
> >> Taking exception 16 [Semihosting call]
> >> ...handling as semihosting call 0xc
> >> Taking exception 16 [Semihosting call]
> >> ...handling as semihosting call 0x6
> >> Taking exception 16 [Semihosting call]
> >> ...handling as semihosting call 0x5
> >> My name is Turing
> >> Taking exception 16 [Semihosting call]
> >> ...handling as semihosting call 0x5
> >> I am alive!!!
> >> Taking exception 16 [Semihosting call]
> >> ...handling as semihosting call 0xa
> >> Taking exception 16 [Semihosting call]
> >> ...handling as semihosting call 0xa
> >> Taking exception 16 [Semihosting call]
> >> ...handling as semihosting call 0x2
> >> Taking exception 16 [Semihosting call]
> >> ...handling as semihosting call 0x20
> >>
> >> Could you please provide any working example using ARM semihosting on
> >> stdin?
>
> We have a test which you can run by hand:
>
>    ./tests/tcg/arm-linux-user/semiconsole
>
> >>
> >> Thanks,
> >> ----
> >> Bruno Prado
> >>
> >>
> >> On Fri, Oct 2, 2020 at 7:25 AM Peter Maydell <peter.maydell@linaro.org>
> >> wrote:
> >>
> >>> On Thu, 1 Oct 2020 at 22:21, Bruno Prado <bruno@dcomp.ufs.br> wrote:
> >>> > Thanks for the reply... I am attaching some code and output:
> >>> >
> >>> > #include <stdio.h>
> >>> > int main() {
> >>> >        char name[50] = "Nobody";
> >>> >        FILE* file = fopen("name", "r");
> >>> >        printf("What is your name?\n");
> >>> >        fprintf(stdout, "Reading from file...\n");
> >>> >        fscanf(file, "%s", name);
> >>> >        fscanf(stdin, "%s", name);
> >>> >        printf("My name is %s\n", name);
> >>> >        fprintf(stderr, "I am alive!!!\n");
> >>> >        fclose(file);
> >>> >        return 0;
> >>> > }
> >>>
> >>> This is not making direct semihosting calls. The behaviour
> >>> of these function calls will depend on whatever the C
> >>> standard library implementation you're linking with is doing.
> >>>
> >>> You're not checking for errors from any of your function
> >>> calls, incidentally.
> >>>
> >>> thanks
> >>> -- PMM
> >>>
> >>
>
>
> --
> Alex Bennée
>