[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: Riku Voipio <riku.voipio@linaro.org>
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@ -1521,3 +1521,9 @@
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#ifdef TARGET_NR_pipe2
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{ TARGET_NR_pipe2, "pipe2", NULL, NULL, NULL },
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#endif
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#ifdef TARGET_NR_atomic_cmpxchg_32
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{ TARGET_NR_atomic_cmpxchg_32, "atomic_cmpxchg_32", NULL, NULL, NULL },
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#endif
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#ifdef TARGET_NR_atomic_barrier
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{ TARGET_NR_atomic_barrier, "atomic_barrier", NULL, NULL, NULL },
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#endif
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@ -9132,6 +9132,34 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
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}
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break;
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}
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#endif
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#ifdef TARGET_NR_atomic_cmpxchg_32
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case TARGET_NR_atomic_cmpxchg_32:
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{
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/* should use start_exclusive from main.c */
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abi_ulong mem_value;
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if (get_user_u32(mem_value, arg6)) {
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target_siginfo_t info;
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info.si_signo = SIGSEGV;
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info.si_errno = 0;
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info.si_code = TARGET_SEGV_MAPERR;
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info._sifields._sigfault._addr = arg6;
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queue_signal((CPUArchState *)cpu_env, info.si_signo, &info);
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ret = 0xdeadbeef;
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}
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if (mem_value == arg2)
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put_user_u32(arg1, arg6);
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ret = mem_value;
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break;
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}
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#endif
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#ifdef TARGET_NR_atomic_barrier
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case TARGET_NR_atomic_barrier:
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{
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/* Like the kernel implementation and the qemu arm barrier, no-op this? */
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break;
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}
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#endif
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default:
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unimplemented:
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