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linux-user: register align p{read, write}64

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pread64 and pwrite64 pass 64bit parameters which for some architectures need
to be aligned to special argument pairs, creating a gap argument.

Handle this special case the same way we handle it in other places of the code.

Reported-by: Alex Barcelo <abarcelo@ac.upc.edu>
Signed-off-by: Alexander Graf <agraf@suse.de>
Tested-by: Alex Barcelo <abarcelo@ac.upc.edu>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
This commit is contained in:
Alexander Graf 2012-09-29 15:32:39 +00:00 committed by Riku Voipio
parent 4a1def4e4e
commit ae017a5b95
1 changed files with 8 additions and 0 deletions
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8
linux-user/syscall.c
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@ -7467,12 +7467,20 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
#endif
#ifdef TARGET_NR_pread64
case TARGET_NR_pread64:
if (regpairs_aligned(cpu_env)) {
arg4 = arg5;
arg5 = arg6;
}
if (!(p = lock_user(VERIFY_WRITE, arg2, arg3, 0)))
goto efault;
ret = get_errno(pread64(arg1, p, arg3, target_offset64(arg4, arg5)));
unlock_user(p, arg2, ret);
break;
case TARGET_NR_pwrite64:
if (regpairs_aligned(cpu_env)) {
arg4 = arg5;
arg5 = arg6;
}
if (!(p = lock_user(VERIFY_READ, arg2, arg3, 1)))
goto efault;
ret = get_errno(pwrite64(arg1, p, arg3, target_offset64(arg4, arg5)));