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[v2] linux-user: implement m68k atomic syscalls

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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>
This commit is contained in:
Riku Voipio 2013-07-24 09:44:26 +03:00
parent 1308c464a8
commit 89aaf1a6ad
2 changed files with 34 additions and 0 deletions
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6
linux-user/strace.list
View file

@ -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

28
linux-user/syscall.c
View file

@ -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: