On 5/14/19 5:52 PM, Alex Bennée wrote:
> The documentation says the write should return the number of bytes not
> written on an error (0 means everything was written). Read provides a
> buffer length and the return value should be the buffer length - bytes
> actually read. Remove the incorrect FIXME's and return the correct
> values.
>
> Signed-off-by: Alex Bennée <alex.ben...@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <phi...@redhat.com>
> ---
> target/arm/arm-semi.c | 20 ++++++++++++--------
> 1 file changed, 12 insertions(+), 8 deletions(-)
>
> diff --git a/target/arm/arm-semi.c b/target/arm/arm-semi.c
> index a3bbef18ef7..3ae8f05d51b 100644
> --- a/target/arm/arm-semi.c
> +++ b/target/arm/arm-semi.c
> @@ -334,13 +334,15 @@ target_ulong do_arm_semihosting(CPUARMState *env)
> } else {
> s = lock_user(VERIFY_READ, arg1, len, 1);
> if (!s) {
> - /* FIXME - should this error code be -TARGET_EFAULT ? */
> - return (uint32_t)-1;
> + /* Return bytes not written on error */
> + return len;
> }
> ret = set_swi_errno(ts, write(arg0, s, len));
> unlock_user(s, arg1, 0);
> - if (ret == (uint32_t)-1)
> - return -1;
> + if (ret == (uint32_t)-1) {
> + ret = 0;
> + }
> + /* Return bytes not written */
> return len - ret;
> }
> case TARGET_SYS_READ:
> @@ -355,15 +357,17 @@ target_ulong do_arm_semihosting(CPUARMState *env)
> } else {
> s = lock_user(VERIFY_WRITE, arg1, len, 0);
> if (!s) {
> - /* FIXME - should this error code be -TARGET_EFAULT ? */
> - return (uint32_t)-1;
> + /* return bytes not read */
> + return len;
> }
> do {
> ret = set_swi_errno(ts, read(arg0, s, len));
> } while (ret == -1 && errno == EINTR);
> unlock_user(s, arg1, len);
> - if (ret == (uint32_t)-1)
> - return -1;
> + if (ret == (uint32_t)-1) {
> + ret = 0;
> + }
> + /* Return bytes not read */
> return len - ret;
> }
> case TARGET_SYS_READC:
>
