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linux-user: Allow getdents to be provided by getdents64

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Newer architectures may only implement the getdents64 syscall, not
getdents. Provide an implementation of getdents in terms of getdents64
so that we can run getdents-using targets on a getdents64-only host.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Tested-by: Claudio Fontana <claudio.fontana@huawei.com>
Message-id: 1370344377-27445-1-git-send-email-peter.maydell@linaro.org
Message-id: 1370193044-24535-1-git-send-email-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2013-06-12 16:20:21 +01:00
parent bd5c51ee6c
commit 3307e2363a
1 changed files with 60 additions and 1 deletions
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61
linux-user/syscall.c
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@ -223,8 +223,11 @@ static int gettid(void) {
return -ENOSYS;
}
#endif
#ifdef __NR_getdents
_syscall3(int, sys_getdents, uint, fd, struct linux_dirent *, dirp, uint, count);
#if defined(TARGET_NR_getdents64) && defined(__NR_getdents64)
#endif
#if !defined(__NR_getdents) || \
(defined(TARGET_NR_getdents64) && defined(__NR_getdents64))
_syscall3(int, sys_getdents64, uint, fd, struct linux_dirent64 *, dirp, uint, count);
#endif
#if defined(TARGET_NR__llseek) && defined(__NR_llseek)
@ -7123,6 +7126,7 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
break;
#endif
case TARGET_NR_getdents:
#ifdef __NR_getdents
#if TARGET_ABI_BITS == 32 && HOST_LONG_BITS == 64
{
struct target_dirent *target_dirp;
@ -7194,6 +7198,61 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
}
unlock_user(dirp, arg2, ret);
}
#endif
#else
/* Implement getdents in terms of getdents64 */
{
struct linux_dirent64 *dirp;
abi_long count = arg3;
dirp = lock_user(VERIFY_WRITE, arg2, count, 0);
if (!dirp) {
goto efault;
}
ret = get_errno(sys_getdents64(arg1, dirp, count));
if (!is_error(ret)) {
/* Convert the dirent64 structs to target dirent. We do this
* in-place, since we can guarantee that a target_dirent is no
* larger than a dirent64; however this means we have to be
* careful to read everything before writing in the new format.
*/
struct linux_dirent64 *de;
struct target_dirent *tde;
int len = ret;
int tlen = 0;
de = dirp;
tde = (struct target_dirent *)dirp;
while (len > 0) {
int namelen, treclen;
int reclen = de->d_reclen;
uint64_t ino = de->d_ino;
int64_t off = de->d_off;
uint8_t type = de->d_type;
namelen = strlen(de->d_name);
treclen = offsetof(struct target_dirent, d_name)
+ namelen + 2;
treclen = QEMU_ALIGN_UP(treclen, sizeof(abi_long));
memmove(tde->d_name, de->d_name, namelen + 1);
tde->d_ino = tswapal(ino);
tde->d_off = tswapal(off);
tde->d_reclen = tswap16(treclen);
/* The target_dirent type is in what was formerly a padding
* byte at the end of the structure:
*/
*(((char *)tde) + treclen - 1) = type;
de = (struct linux_dirent64 *)((char *)de + reclen);
tde = (struct target_dirent *)((char *)tde + treclen);
len -= reclen;
tlen += treclen;
}
ret = tlen;
}
unlock_user(dirp, arg2, ret);
}
#endif
break;
#if defined(TARGET_NR_getdents64) && defined(__NR_getdents64)