* ARM semihosting issue @ 2020-10-01 18:19 Bruno Prado 2020-10-01 20:38 ` Peter Maydell 0 siblings, 1 reply; 8+ messages in thread From: Bruno Prado @ 2020-10-01 18:19 UTC (permalink / raw) To: qemu-devel [-- Attachment #1: Type: text/plain, Size: 305 bytes --] Hi, I was able to use stdout, stderr for output and files for both input and output in qemu-system-arm, but stdin is not working (always returns -1 from syscall). I found no information and have already checked the code for possible hints. I am on Arch Linux LTS + QEMU 5.1.0. Thanks, ---- Bruno Prado [-- Attachment #2: Type: text/html, Size: 507 bytes --] ^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: ARM semihosting issue 2020-10-01 18:19 ARM semihosting issue Bruno Prado @ 2020-10-01 20:38 ` Peter Maydell 2020-10-01 21:20 ` Bruno Prado 0 siblings, 1 reply; 8+ messages in thread From: Peter Maydell @ 2020-10-01 20:38 UTC (permalink / raw) To: Bruno Prado; +Cc: QEMU Developers On Thu, 1 Oct 2020 at 21:33, Bruno Prado <bruno@dcomp.ufs.br> wrote: > I was able to use stdout, stderr for output and files for > both input and output in qemu-system-arm, but stdin is not > working (always returns -1 from syscall). I found no > information and have already checked the code for possible hints. Rather hard to say what might be going on with this little information... what semihosting calls are you making, what do you expect them to do and what do they actually do? Do you have a minimal test case we can reproduce with? thanks -- PMM ^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: ARM semihosting issue 2020-10-01 20:38 ` Peter Maydell @ 2020-10-01 21:20 ` Bruno Prado 2020-10-02 10:25 ` Peter Maydell 0 siblings, 1 reply; 8+ messages in thread From: Bruno Prado @ 2020-10-01 21:20 UTC (permalink / raw) To: Peter Maydell; +Cc: QEMU Developers [-- Attachment #1: Type: text/plain, Size: 1420 bytes --] 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; } $ cat name Turing $ qemu-system-arm -M netduino2 -nographic -semihosting -kernel vp2.bin What is your name? Reading from file... My name is Turing I am alive!!! $ Basically the scanf call has no effect. I was expecting a pause in execution to input a string, but nothing happens. Regards, ---- Bruno Prado On Thu, Oct 1, 2020 at 5:38 PM Peter Maydell <peter.maydell@linaro.org> wrote: > On Thu, 1 Oct 2020 at 21:33, Bruno Prado <bruno@dcomp.ufs.br> wrote: > > I was able to use stdout, stderr for output and files for > > both input and output in qemu-system-arm, but stdin is not > > working (always returns -1 from syscall). I found no > > information and have already checked the code for possible hints. > > Rather hard to say what might be going on with this little > information... what semihosting calls are you making, what > do you expect them to do and what do they actually do? > Do you have a minimal test case we can reproduce with? > > thanks > -- PMM > [-- Attachment #2: Type: text/html, Size: 2940 bytes --] ^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: ARM semihosting issue 2020-10-01 21:20 ` Bruno Prado @ 2020-10-02 10:25 ` Peter Maydell 2020-10-02 11:09 ` Bruno Prado 0 siblings, 1 reply; 8+ messages in thread From: Peter Maydell @ 2020-10-02 10:25 UTC (permalink / raw) To: Bruno Prado; +Cc: QEMU Developers 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 ^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: ARM semihosting issue 2020-10-02 10:25 ` Peter Maydell @ 2020-10-02 11:09 ` Bruno Prado 2020-10-21 14:16 ` Bruno Prado 0 siblings, 1 reply; 8+ messages in thread From: Bruno Prado @ 2020-10-02 11:09 UTC (permalink / raw) To: Peter Maydell; +Cc: QEMU Developers [-- Attachment #1: Type: text/plain, Size: 3149 bytes --] 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? 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 > [-- Attachment #2: Type: text/html, Size: 5306 bytes --] ^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: ARM semihosting issue 2020-10-02 11:09 ` Bruno Prado @ 2020-10-21 14:16 ` Bruno Prado 2020-10-21 15:45 ` Alex Bennée 0 siblings, 1 reply; 8+ messages in thread From: Bruno Prado @ 2020-10-21 14:16 UTC (permalink / raw) To: Peter Maydell; +Cc: QEMU Developers [-- Attachment #1: Type: text/plain, Size: 3453 bytes --] 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? > > 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 >> > [-- Attachment #2: Type: text/html, Size: 5326 bytes --] ^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: ARM semihosting issue 2020-10-21 14:16 ` Bruno Prado @ 2020-10-21 15:45 ` Alex Bennée 2020-10-21 17:51 ` Bruno Prado 0 siblings, 1 reply; 8+ messages in thread From: Alex Bennée @ 2020-10-21 15:45 UTC (permalink / raw) To: Bruno Prado; +Cc: Peter Maydell, qemu-devel 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 ^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: ARM semihosting issue 2020-10-21 15:45 ` Alex Bennée @ 2020-10-21 17:51 ` Bruno Prado 0 siblings, 0 replies; 8+ messages in thread From: Bruno Prado @ 2020-10-21 17:51 UTC (permalink / raw) To: Alex Bennée; +Cc: Peter Maydell, QEMU Developers [-- Attachment #1: Type: text/plain, Size: 4258 bytes --] 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 > [-- Attachment #2: Type: text/html, Size: 6234 bytes --] ^ permalink raw reply [flat|nested] 8+ messages in thread
end of thread, other threads:[~2020-10-21 18:15 UTC | newest] Thread overview: 8+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 2020-10-01 18:19 ARM semihosting issue Bruno Prado 2020-10-01 20:38 ` Peter Maydell 2020-10-01 21:20 ` Bruno Prado 2020-10-02 10:25 ` Peter Maydell 2020-10-02 11:09 ` Bruno Prado 2020-10-21 14:16 ` Bruno Prado 2020-10-21 15:45 ` Alex Bennée 2020-10-21 17:51 ` Bruno Prado
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