Commit 89aaf1a6 authored by Riku Voipio's avatar Riku Voipio
Browse files

[v2] linux-user: implement m68k atomic syscalls 



With nptl enabled, atomic_cmpxchg_32 and atomic_barrier
system calls are needed. This patch enabled really dummy
versions of the system calls, modeled after the m68k
kernel code.

With this patch I am able to execute m68k binaries
with qemu linux-user (busybox compiled for coldfire).

[v2] que an segfault instead of returning a EFAULT
to keep in line with kernel code.

Cc: Laurent Vivier <laurent@vivier.eu>
Signed-off-by: default avatarRiku Voipio <riku.voipio@linaro.org>
parent 1308c464

linux-user/strace.list

+6 −0
Original line number Diff line number Diff line
@@ -1521,3 +1521,9 @@ 
#ifdef TARGET_NR_pipe2

{ TARGET_NR_pipe2, "pipe2", NULL, NULL, NULL },

#endif

#ifdef TARGET_NR_atomic_cmpxchg_32

{ TARGET_NR_atomic_cmpxchg_32, "atomic_cmpxchg_32", NULL, NULL, NULL },

#endif

#ifdef TARGET_NR_atomic_barrier

{ TARGET_NR_atomic_barrier, "atomic_barrier", NULL, NULL, NULL },

#endif

linux-user/syscall.c

+28 −0
Original line number Diff line number Diff line
@@ -9132,6 +9132,34 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1, 
        }

        break;

    }

#endif

#ifdef TARGET_NR_atomic_cmpxchg_32

    case TARGET_NR_atomic_cmpxchg_32:

    {

        /* should use start_exclusive from main.c */

        abi_ulong mem_value;

        if (get_user_u32(mem_value, arg6)) {

            target_siginfo_t info;

            info.si_signo = SIGSEGV;

            info.si_errno = 0;

            info.si_code = TARGET_SEGV_MAPERR;

            info._sifields._sigfault._addr = arg6;

            queue_signal((CPUArchState *)cpu_env, info.si_signo, &info);

            ret = 0xdeadbeef;



        }

        if (mem_value == arg2)

            put_user_u32(arg1, arg6);

        ret = mem_value;

        break;

    }

#endif

#ifdef TARGET_NR_atomic_barrier

    case TARGET_NR_atomic_barrier:

    {

        /* Like the kernel implementation and the qemu arm barrier, no-op this? */

        break;

    }

#endif

    default:

    unimplemented: