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bsd-user: Implement symlink, symlinkat, readlink and readlinkat

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Signed-off-by: Stacey Son <sson@FreeBSD.org>
Signed-off-by: Jung-uk Kim <jkim@FreeBSD.org>
Signed-off-by: Warner Losh <imp@bsdimp.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Warner Losh 2022-06-14 14:44:10 -06:00
parent af2ae2e8ac
commit c7b62b4a87
2 changed files with 90 additions and 0 deletions
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74
bsd-user/bsd-file.h
View File

@ -601,4 +601,78 @@ static abi_long do_bsd_nmount(abi_long arg1, abi_long count,
return ret;
}
/* symlink(2) */
static abi_long do_bsd_symlink(abi_long arg1, abi_long arg2)
{
abi_long ret;
void *p1, *p2;
LOCK_PATH2(p1, arg1, p2, arg2);
ret = get_errno(symlink(p1, p2)); /* XXX path(p1), path(p2) */
UNLOCK_PATH2(p1, arg1, p2, arg2);
return ret;
}
/* symlinkat(2) */
static abi_long do_bsd_symlinkat(abi_long arg1, abi_long arg2,
abi_long arg3)
{
abi_long ret;
void *p1, *p2;
LOCK_PATH2(p1, arg1, p2, arg3);
ret = get_errno(symlinkat(p1, arg2, p2)); /* XXX path(p1), path(p2) */
UNLOCK_PATH2(p1, arg1, p2, arg3);
return ret;
}
/* readlink(2) */
static abi_long do_bsd_readlink(CPUArchState *env, abi_long arg1,
abi_long arg2, abi_long arg3)
{
abi_long ret;
void *p1, *p2;
LOCK_PATH(p1, arg1);
p2 = lock_user(VERIFY_WRITE, arg2, arg3, 0);
if (p2 == NULL) {
UNLOCK_PATH(p1, arg1);
return -TARGET_EFAULT;
}
if (strcmp(p1, "/proc/curproc/file") == 0) {
CPUState *cpu = env_cpu(env);
TaskState *ts = (TaskState *)cpu->opaque;
strncpy(p2, ts->bprm->fullpath, arg3);
ret = MIN((abi_long)strlen(ts->bprm->fullpath), arg3);
} else {
ret = get_errno(readlink(path(p1), p2, arg3));
}
unlock_user(p2, arg2, ret);
UNLOCK_PATH(p1, arg1);
return ret;
}
/* readlinkat(2) */
static abi_long do_bsd_readlinkat(abi_long arg1, abi_long arg2,
abi_long arg3, abi_long arg4)
{
abi_long ret;
void *p1, *p2;
LOCK_PATH(p1, arg2);
p2 = lock_user(VERIFY_WRITE, arg3, arg4, 0);
if (p2 == NULL) {
UNLOCK_PATH(p1, arg2);
return -TARGET_EFAULT;
}
ret = get_errno(readlinkat(arg1, p1, p2, arg4));
unlock_user(p2, arg3, ret);
UNLOCK_PATH(p1, arg2);
return ret;
}
#endif /* BSD_FILE_H */

16
bsd-user/freebsd/os-syscall.c
View File

@ -386,6 +386,22 @@ static abi_long freebsd_syscall(void *cpu_env, int num, abi_long arg1,
ret = do_bsd_nmount(arg1, arg2, arg3);
break;
case TARGET_FREEBSD_NR_symlink: /* symlink(2) */
ret = do_bsd_symlink(arg1, arg2);
break;
case TARGET_FREEBSD_NR_symlinkat: /* symlinkat(2) */
ret = do_bsd_symlinkat(arg1, arg2, arg3);
break;
case TARGET_FREEBSD_NR_readlink: /* readlink(2) */
ret = do_bsd_readlink(cpu_env, arg1, arg2, arg3);
break;
case TARGET_FREEBSD_NR_readlinkat: /* readlinkat(2) */
ret = do_bsd_readlinkat(arg1, arg2, arg3, arg4);
break;
default:
qemu_log_mask(LOG_UNIMP, "Unsupported syscall: %d\n", num);
ret = -TARGET_ENOSYS;