Re: [PATCH 02/14] linux-user/sparc: Tidy syscall trap

[Richard Henderson]

On 2/1/23 14:51, Richard Henderson wrote:
> Use TT_TRAP.
>
> For sparc32, 0x88 is the "Slowaris" system call, currently
> BAD_TRAP in the kernel's ttable_32.S.
>
> For sparc64, 0x110 is tl0_linux32, the sparc32 trap, as also
> seen in the adjacent code.  We do not implement multiple abis,
> so treat this as !defined(CONFIG_COMPAT), which vectors this
> case to BTRAP.  This was presumably a typo for 0x111, which is
> the "old" linux64 syscall number.  Both old and new linux64
> syscalls traps vector to LINUX_64BIT_SYSCALL_TRAP.
>
> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
> ---
>   linux-user/sparc/cpu_loop.c | 9 ++++-----
>   1 file changed, 4 insertions(+), 5 deletions(-)
>
> diff --git a/linux-user/sparc/cpu_loop.c b/linux-user/sparc/cpu_loop.c
> index c120c42278..18d5c24af1 100644
> --- a/linux-user/sparc/cpu_loop.c
> +++ b/linux-user/sparc/cpu_loop.c
> @@ -167,12 +167,11 @@ void cpu_loop (CPUSPARCState *env)
>           }
>   
>           switch (trapnr) {
> -#ifndef TARGET_SPARC64
> -        case 0x88:
> -        case 0x90:
> +#ifdef TARGET_SPARC64
> +        case TT_TRAP + 0x11: /* tl0_oldlinux64 */
> +        case TT_TRAP + 0x6d: /* tl0_linux64 */
>   #else
> -        case 0x110:
> -        case 0x16d:
> +        case TT_TRAP + 0x10: /* t_linux */


Bah.  I just realized this is wrong.  This breaks v8plus.
What's needed is


#ifdef TARGET_ABI32
#define TARGET_TT_SYSCALL  TT_TRAP + 0x10
#else
#define TARGET_TT_SYSCALL  TT_TRAP + 0x6d
#endif

and ignore tl0_oldlinux64 (0x111), which must be so old
that we've never missed it.


r~