1 /* SPDX-License-Identifier: GPL-2.0 */ <<
2 /* SunOS's execv() call only specifies 1 /* SunOS's execv() call only specifies the argv argument, the
3 * environment settings are the same a 2 * environment settings are the same as the calling processes.
4 */ 3 */
5 sys64_execve: 4 sys64_execve:
6 set sys_execve, %g1 5 set sys_execve, %g1
7 jmpl %g1, %g0 6 jmpl %g1, %g0
8 flushw 7 flushw
9 8
10 sys64_execveat: 9 sys64_execveat:
11 set sys_execveat, %g1 10 set sys_execveat, %g1
12 jmpl %g1, %g0 11 jmpl %g1, %g0
13 flushw 12 flushw
14 13
15 #ifdef CONFIG_COMPAT 14 #ifdef CONFIG_COMPAT
16 sunos_execv: 15 sunos_execv:
17 mov %g0, %o2 16 mov %g0, %o2
18 sys32_execve: 17 sys32_execve:
19 set compat_sys_execve, %g1 18 set compat_sys_execve, %g1
20 jmpl %g1, %g0 19 jmpl %g1, %g0
21 flushw 20 flushw
22 21
23 sys32_execveat: 22 sys32_execveat:
24 set compat_sys_execveat, %g1 23 set compat_sys_execveat, %g1
25 jmpl %g1, %g0 24 jmpl %g1, %g0
26 flushw 25 flushw
27 #endif 26 #endif
28 27
29 .align 32 28 .align 32
>> 29 sys_sparc_pipe:
>> 30 ba,pt %xcc, sys_sparc_pipe_real
>> 31 add %sp, PTREGS_OFF, %o0
>> 32 sys_nis_syscall:
>> 33 ba,pt %xcc, c_sys_nis_syscall
>> 34 add %sp, PTREGS_OFF, %o0
>> 35 sys_memory_ordering:
>> 36 ba,pt %xcc, sparc_memory_ordering
>> 37 add %sp, PTREGS_OFF, %o1
30 #ifdef CONFIG_COMPAT 38 #ifdef CONFIG_COMPAT
31 sys32_sigstack: 39 sys32_sigstack:
32 ba,pt %xcc, do_sys32_sigstack 40 ba,pt %xcc, do_sys32_sigstack
33 mov %i6, %o2 41 mov %i6, %o2
34 #endif 42 #endif
35 .align 32 43 .align 32
36 #ifdef CONFIG_COMPAT 44 #ifdef CONFIG_COMPAT
37 sys32_sigreturn: 45 sys32_sigreturn:
38 add %sp, PTREGS_OFF, %o0 46 add %sp, PTREGS_OFF, %o0
39 call do_sigreturn32 47 call do_sigreturn32
40 add %o7, 1f-.-4, %o7 48 add %o7, 1f-.-4, %o7
41 nop 49 nop
42 #endif 50 #endif
43 sys_rt_sigreturn: 51 sys_rt_sigreturn:
44 add %sp, PTREGS_OFF, %o0 52 add %sp, PTREGS_OFF, %o0
45 call do_rt_sigreturn 53 call do_rt_sigreturn
46 add %o7, 1f-.-4, %o7 54 add %o7, 1f-.-4, %o7
47 nop 55 nop
48 #ifdef CONFIG_COMPAT 56 #ifdef CONFIG_COMPAT
49 sys32_rt_sigreturn: 57 sys32_rt_sigreturn:
50 add %sp, PTREGS_OFF, %o0 58 add %sp, PTREGS_OFF, %o0
51 call do_rt_sigreturn32 59 call do_rt_sigreturn32
52 add %o7, 1f-.-4, %o7 60 add %o7, 1f-.-4, %o7
53 nop 61 nop
54 #endif 62 #endif
55 .align 32 63 .align 32
56 1: ldx [%g6 + TI_FLAGS], %l5 64 1: ldx [%g6 + TI_FLAGS], %l5
57 andcc %l5, (_TIF_SYSCALL_TRACE|_TIF_ 65 andcc %l5, (_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT|_TIF_SYSCALL_TRACEPOINT|_TIF_NOHZ), %g0
58 be,pt %icc, rtrap 66 be,pt %icc, rtrap
59 nop 67 nop
60 call syscall_trace_leave 68 call syscall_trace_leave
61 add %sp, PTREGS_OFF, %o0 69 add %sp, PTREGS_OFF, %o0
62 ba,pt %xcc, rtrap 70 ba,pt %xcc, rtrap
63 nop 71 nop
64 72
65 /* This is how fork() was meant to be 73 /* This is how fork() was meant to be done, 8 instruction entry.
66 * 74 *
67 * I questioned the following code bri 75 * I questioned the following code briefly, let me clear things
68 * up so you must not reason on it lik 76 * up so you must not reason on it like I did.
69 * 77 *
70 * Know the fork_kpsr etc. we use in t 78 * Know the fork_kpsr etc. we use in the sparc32 port? We don't
71 * need it here because the only piece 79 * need it here because the only piece of window state we copy to
72 * the child is the CWP register. Eve 80 * the child is the CWP register. Even if the parent sleeps,
73 * we are safe because we stuck it int 81 * we are safe because we stuck it into pt_regs of the parent
74 * so it will not change. 82 * so it will not change.
75 * 83 *
76 * XXX This raises the question, wheth 84 * XXX This raises the question, whether we can do the same on
77 * XXX sparc32 to get rid of fork_kpsr 85 * XXX sparc32 to get rid of fork_kpsr _and_ fork_kwim. The
78 * XXX answer is yes. We stick fork_k 86 * XXX answer is yes. We stick fork_kpsr in UREG_G0 and
79 * XXX fork_kwim in UREG_G1 (global re 87 * XXX fork_kwim in UREG_G1 (global registers are considered
80 * XXX volatile across a system call i 88 * XXX volatile across a system call in the sparc ABI I think
81 * XXX if it isn't we can use regs->y 89 * XXX if it isn't we can use regs->y instead, anyone who depends
82 * XXX upon the Y register being prese 90 * XXX upon the Y register being preserved across a fork deserves
83 * XXX to lose). 91 * XXX to lose).
84 * 92 *
85 * In fact we should take advantage of 93 * In fact we should take advantage of that fact for other things
86 * during system calls... 94 * during system calls...
87 */ 95 */
88 .align 32 96 .align 32
89 sys_vfork: !! 97 sys_vfork: /* Under Linux, vfork and fork are just special cases of clone. */
90 flushw !! 98 sethi %hi(0x4000 | 0x0100 | SIGCHLD), %o0
91 ba,pt %xcc, sparc_vfork !! 99 or %o0, %lo(0x4000 | 0x0100 | SIGCHLD), %o0
92 add %sp, PTREGS_OFF, %o0 !! 100 ba,pt %xcc, sys_clone
93 <<
94 .align 32 <<
95 sys_fork: 101 sys_fork:
96 flushw !! 102 clr %o1
97 ba,pt %xcc, sparc_fork !! 103 mov SIGCHLD, %o0
98 add %sp, PTREGS_OFF, %o0 <<
99 <<
100 .align 32 <<
101 sys_clone: 104 sys_clone:
102 flushw 105 flushw
103 ba,pt %xcc, sparc_clone !! 106 movrz %o1, %fp, %o1
104 add %sp, PTREGS_OFF, %o0 !! 107 mov 0, %o3
>> 108 ba,pt %xcc, sparc_do_fork
>> 109 add %sp, PTREGS_OFF, %o2
105 110
106 .globl ret_from_fork 111 .globl ret_from_fork
107 ret_from_fork: 112 ret_from_fork:
108 /* Clear current_thread_info()->new_ch 113 /* Clear current_thread_info()->new_child. */
109 stb %g0, [%g6 + TI_NEW_CHILD] 114 stb %g0, [%g6 + TI_NEW_CHILD]
110 call schedule_tail 115 call schedule_tail
111 mov %g7, %o0 116 mov %g7, %o0
112 ldx [%sp + PTREGS_OFF + PT_V9_I0], 117 ldx [%sp + PTREGS_OFF + PT_V9_I0], %o0
113 brnz,pt %o0, ret_sys_call 118 brnz,pt %o0, ret_sys_call
114 ldx [%g6 + TI_FLAGS], %l0 119 ldx [%g6 + TI_FLAGS], %l0
115 ldx [%sp + PTREGS_OFF + PT_V9_G1], 120 ldx [%sp + PTREGS_OFF + PT_V9_G1], %l1
116 call %l1 121 call %l1
117 ldx [%sp + PTREGS_OFF + PT_V9_G2], 122 ldx [%sp + PTREGS_OFF + PT_V9_G2], %o0
118 ba,pt %xcc, ret_sys_call 123 ba,pt %xcc, ret_sys_call
119 mov 0, %o0 124 mov 0, %o0
120 125
121 .globl sparc_exit_group 126 .globl sparc_exit_group
122 .type sparc_exit_group,#function 127 .type sparc_exit_group,#function
123 sparc_exit_group: 128 sparc_exit_group:
124 sethi %hi(sys_exit_group), %g7 129 sethi %hi(sys_exit_group), %g7
125 ba,pt %xcc, 1f 130 ba,pt %xcc, 1f
126 or %g7, %lo(sys_exit_group), %g7 131 or %g7, %lo(sys_exit_group), %g7
127 .size sparc_exit_group,.-sparc_exit_ 132 .size sparc_exit_group,.-sparc_exit_group
128 133
129 .globl sparc_exit 134 .globl sparc_exit
130 .type sparc_exit,#function 135 .type sparc_exit,#function
131 sparc_exit: 136 sparc_exit:
132 sethi %hi(sys_exit), %g7 137 sethi %hi(sys_exit), %g7
133 or %g7, %lo(sys_exit), %g7 138 or %g7, %lo(sys_exit), %g7
134 1: rdpr %pstate, %g2 139 1: rdpr %pstate, %g2
135 wrpr %g2, PSTATE_IE, %pstate 140 wrpr %g2, PSTATE_IE, %pstate
136 rdpr %otherwin, %g1 141 rdpr %otherwin, %g1
137 rdpr %cansave, %g3 142 rdpr %cansave, %g3
138 add %g3, %g1, %g3 143 add %g3, %g1, %g3
139 wrpr %g3, 0x0, %cansave 144 wrpr %g3, 0x0, %cansave
140 wrpr %g0, 0x0, %otherwin 145 wrpr %g0, 0x0, %otherwin
141 wrpr %g2, 0x0, %pstate 146 wrpr %g2, 0x0, %pstate
142 jmpl %g7, %g0 147 jmpl %g7, %g0
143 stb %g0, [%g6 + TI_WSAVED] 148 stb %g0, [%g6 + TI_WSAVED]
144 .size sparc_exit,.-sparc_exit 149 .size sparc_exit,.-sparc_exit
145 150
146 linux_sparc_ni_syscall: 151 linux_sparc_ni_syscall:
147 sethi %hi(sys_ni_syscall), %l7 152 sethi %hi(sys_ni_syscall), %l7
148 ba,pt %xcc, 4f 153 ba,pt %xcc, 4f
149 or %l7, %lo(sys_ni_syscall), %l7 154 or %l7, %lo(sys_ni_syscall), %l7
150 155
151 linux_syscall_trace32: 156 linux_syscall_trace32:
152 call syscall_trace_enter 157 call syscall_trace_enter
153 add %sp, PTREGS_OFF, %o0 158 add %sp, PTREGS_OFF, %o0
154 brnz,pn %o0, 3f 159 brnz,pn %o0, 3f
155 mov -ENOSYS, %o0 160 mov -ENOSYS, %o0
156 161
157 /* Syscall tracing can modify the regi 162 /* Syscall tracing can modify the registers. */
158 ldx [%sp + PTREGS_OFF + PT_V9_G1], 163 ldx [%sp + PTREGS_OFF + PT_V9_G1], %g1
159 sethi %hi(sys_call_table32), %l7 164 sethi %hi(sys_call_table32), %l7
160 ldx [%sp + PTREGS_OFF + PT_V9_I0], 165 ldx [%sp + PTREGS_OFF + PT_V9_I0], %i0
161 or %l7, %lo(sys_call_table32), %l 166 or %l7, %lo(sys_call_table32), %l7
162 ldx [%sp + PTREGS_OFF + PT_V9_I1], 167 ldx [%sp + PTREGS_OFF + PT_V9_I1], %i1
163 ldx [%sp + PTREGS_OFF + PT_V9_I2], 168 ldx [%sp + PTREGS_OFF + PT_V9_I2], %i2
164 ldx [%sp + PTREGS_OFF + PT_V9_I3], 169 ldx [%sp + PTREGS_OFF + PT_V9_I3], %i3
165 ldx [%sp + PTREGS_OFF + PT_V9_I4], 170 ldx [%sp + PTREGS_OFF + PT_V9_I4], %i4
166 ldx [%sp + PTREGS_OFF + PT_V9_I5], 171 ldx [%sp + PTREGS_OFF + PT_V9_I5], %i5
167 172
168 cmp %g1, NR_syscalls 173 cmp %g1, NR_syscalls
169 bgeu,pn %xcc, 3f 174 bgeu,pn %xcc, 3f
170 mov -ENOSYS, %o0 175 mov -ENOSYS, %o0
171 176
172 sll %g1, 2, %l4 177 sll %g1, 2, %l4
173 srl %i0, 0, %o0 178 srl %i0, 0, %o0
174 lduw [%l7 + %l4], %l7 179 lduw [%l7 + %l4], %l7
175 srl %i4, 0, %o4 180 srl %i4, 0, %o4
176 srl %i1, 0, %o1 181 srl %i1, 0, %o1
177 srl %i2, 0, %o2 182 srl %i2, 0, %o2
178 ba,pt %xcc, 5f 183 ba,pt %xcc, 5f
179 srl %i3, 0, %o3 184 srl %i3, 0, %o3
180 185
181 linux_syscall_trace: 186 linux_syscall_trace:
182 call syscall_trace_enter 187 call syscall_trace_enter
183 add %sp, PTREGS_OFF, %o0 188 add %sp, PTREGS_OFF, %o0
184 brnz,pn %o0, 3f 189 brnz,pn %o0, 3f
185 mov -ENOSYS, %o0 190 mov -ENOSYS, %o0
186 191
187 /* Syscall tracing can modify the regi 192 /* Syscall tracing can modify the registers. */
188 ldx [%sp + PTREGS_OFF + PT_V9_G1], 193 ldx [%sp + PTREGS_OFF + PT_V9_G1], %g1
189 sethi %hi(sys_call_table64), %l7 194 sethi %hi(sys_call_table64), %l7
190 ldx [%sp + PTREGS_OFF + PT_V9_I0], 195 ldx [%sp + PTREGS_OFF + PT_V9_I0], %i0
191 or %l7, %lo(sys_call_table64), %l 196 or %l7, %lo(sys_call_table64), %l7
192 ldx [%sp + PTREGS_OFF + PT_V9_I1], 197 ldx [%sp + PTREGS_OFF + PT_V9_I1], %i1
193 ldx [%sp + PTREGS_OFF + PT_V9_I2], 198 ldx [%sp + PTREGS_OFF + PT_V9_I2], %i2
194 ldx [%sp + PTREGS_OFF + PT_V9_I3], 199 ldx [%sp + PTREGS_OFF + PT_V9_I3], %i3
195 ldx [%sp + PTREGS_OFF + PT_V9_I4], 200 ldx [%sp + PTREGS_OFF + PT_V9_I4], %i4
196 ldx [%sp + PTREGS_OFF + PT_V9_I5], 201 ldx [%sp + PTREGS_OFF + PT_V9_I5], %i5
197 202
198 cmp %g1, NR_syscalls 203 cmp %g1, NR_syscalls
199 bgeu,pn %xcc, 3f 204 bgeu,pn %xcc, 3f
200 mov -ENOSYS, %o0 205 mov -ENOSYS, %o0
201 206
202 sll %g1, 2, %l4 207 sll %g1, 2, %l4
203 mov %i0, %o0 208 mov %i0, %o0
204 lduw [%l7 + %l4], %l7 209 lduw [%l7 + %l4], %l7
205 mov %i1, %o1 210 mov %i1, %o1
206 mov %i2, %o2 211 mov %i2, %o2
207 mov %i3, %o3 212 mov %i3, %o3
208 b,pt %xcc, 2f 213 b,pt %xcc, 2f
209 mov %i4, %o4 214 mov %i4, %o4
210 215
211 216
212 /* Linux 32-bit system calls enter her 217 /* Linux 32-bit system calls enter here... */
213 .align 32 218 .align 32
214 .globl linux_sparc_syscall32 219 .globl linux_sparc_syscall32
215 linux_sparc_syscall32: 220 linux_sparc_syscall32:
216 /* Direct access to user regs, much fa 221 /* Direct access to user regs, much faster. */
217 cmp %g1, NR_syscalls 222 cmp %g1, NR_syscalls ! IEU1 Group
218 bgeu,pn %xcc, linux_sparc_ni_syscall 223 bgeu,pn %xcc, linux_sparc_ni_syscall ! CTI
219 srl %i0, 0, %o0 224 srl %i0, 0, %o0 ! IEU0
220 sll %g1, 2, %l4 225 sll %g1, 2, %l4 ! IEU0 Group
221 srl %i4, 0, %o4 226 srl %i4, 0, %o4 ! IEU1
222 lduw [%l7 + %l4], %l7 227 lduw [%l7 + %l4], %l7 ! Load
223 srl %i1, 0, %o1 228 srl %i1, 0, %o1 ! IEU0 Group
224 ldx [%g6 + TI_FLAGS], %l0 229 ldx [%g6 + TI_FLAGS], %l0 ! Load
225 230
226 srl %i3, 0, %o3 231 srl %i3, 0, %o3 ! IEU0
227 srl %i2, 0, %o2 232 srl %i2, 0, %o2 ! IEU0 Group
228 andcc %l0, (_TIF_SYSCALL_TRACE|_TIF_ 233 andcc %l0, (_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT|_TIF_SYSCALL_TRACEPOINT|_TIF_NOHZ), %g0
229 bne,pn %icc, linux_syscall_trace32 234 bne,pn %icc, linux_syscall_trace32 ! CTI
230 mov %i0, %l5 235 mov %i0, %l5 ! IEU1
231 5: call %l7 236 5: call %l7 ! CTI Group brk forced
232 srl %i5, 0, %o5 237 srl %i5, 0, %o5 ! IEU1
233 ba,pt %xcc, 3f 238 ba,pt %xcc, 3f
234 sra %o0, 0, %o0 239 sra %o0, 0, %o0
235 240
236 /* Linux native system calls enter her 241 /* Linux native system calls enter here... */
237 .align 32 242 .align 32
238 .globl linux_sparc_syscall 243 .globl linux_sparc_syscall
239 linux_sparc_syscall: 244 linux_sparc_syscall:
240 /* Direct access to user regs, much fa 245 /* Direct access to user regs, much faster. */
241 cmp %g1, NR_syscalls 246 cmp %g1, NR_syscalls ! IEU1 Group
242 bgeu,pn %xcc, linux_sparc_ni_syscall 247 bgeu,pn %xcc, linux_sparc_ni_syscall ! CTI
243 mov %i0, %o0 248 mov %i0, %o0 ! IEU0
244 sll %g1, 2, %l4 249 sll %g1, 2, %l4 ! IEU0 Group
245 mov %i1, %o1 250 mov %i1, %o1 ! IEU1
246 lduw [%l7 + %l4], %l7 251 lduw [%l7 + %l4], %l7 ! Load
247 4: mov %i2, %o2 252 4: mov %i2, %o2 ! IEU0 Group
248 ldx [%g6 + TI_FLAGS], %l0 253 ldx [%g6 + TI_FLAGS], %l0 ! Load
249 254
250 mov %i3, %o3 255 mov %i3, %o3 ! IEU1
251 mov %i4, %o4 256 mov %i4, %o4 ! IEU0 Group
252 andcc %l0, (_TIF_SYSCALL_TRACE|_TIF_ 257 andcc %l0, (_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT|_TIF_SYSCALL_TRACEPOINT|_TIF_NOHZ), %g0
253 bne,pn %icc, linux_syscall_trace 258 bne,pn %icc, linux_syscall_trace ! CTI Group
254 mov %i0, %l5 259 mov %i0, %l5 ! IEU0
255 2: call %l7 260 2: call %l7 ! CTI Group brk forced
256 mov %i5, %o5 261 mov %i5, %o5 ! IEU0
257 nop 262 nop
258 263
259 3: stx %o0, [%sp + PTREGS_OFF + PT_V9 264 3: stx %o0, [%sp + PTREGS_OFF + PT_V9_I0]
260 ret_sys_call: 265 ret_sys_call:
261 ldx [%sp + PTREGS_OFF + PT_V9_TSTA 266 ldx [%sp + PTREGS_OFF + PT_V9_TSTATE], %g3
262 mov %ulo(TSTATE_XCARRY | TSTATE_IC 267 mov %ulo(TSTATE_XCARRY | TSTATE_ICARRY), %g2
263 sllx %g2, 32, %g2 268 sllx %g2, 32, %g2
264 269
265 cmp %o0, -ERESTART_RESTARTBLOCK 270 cmp %o0, -ERESTART_RESTARTBLOCK
266 bgeu,pn %xcc, 1f 271 bgeu,pn %xcc, 1f
267 andcc %l0, (_TIF_SYSCALL_TRACE|_TIF_ 272 andcc %l0, (_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT|_TIF_SYSCALL_TRACEPOINT|_TIF_NOHZ), %g0
268 ldx [%sp + PTREGS_OFF + PT_V9_TNPC 273 ldx [%sp + PTREGS_OFF + PT_V9_TNPC], %l1 ! pc = npc
269 274
270 2: 275 2:
271 /* System call success, clear Carry co 276 /* System call success, clear Carry condition code. */
272 andn %g3, %g2, %g3 277 andn %g3, %g2, %g3
273 3: 278 3:
274 stx %g3, [%sp + PTREGS_OFF + PT_V9 279 stx %g3, [%sp + PTREGS_OFF + PT_V9_TSTATE]
275 bne,pn %icc, linux_syscall_trace2 280 bne,pn %icc, linux_syscall_trace2
276 add %l1, 0x4, %l2 281 add %l1, 0x4, %l2 ! npc = npc+4
277 stx %l1, [%sp + PTREGS_OFF + PT_V9 282 stx %l1, [%sp + PTREGS_OFF + PT_V9_TPC]
278 ba,pt %xcc, rtrap 283 ba,pt %xcc, rtrap
279 stx %l2, [%sp + PTREGS_OFF + PT_V9 284 stx %l2, [%sp + PTREGS_OFF + PT_V9_TNPC]
280 285
281 1: 286 1:
282 /* Check if force_successful_syscall_r 287 /* Check if force_successful_syscall_return()
283 * was invoked. 288 * was invoked.
284 */ 289 */
285 ldub [%g6 + TI_SYS_NOERROR], %l2 290 ldub [%g6 + TI_SYS_NOERROR], %l2
286 brnz,pn %l2, 2b 291 brnz,pn %l2, 2b
287 ldx [%sp + PTREGS_OFF + PT_V9_TNPC 292 ldx [%sp + PTREGS_OFF + PT_V9_TNPC], %l1 ! pc = npc
288 /* System call failure, set Carry cond 293 /* System call failure, set Carry condition code.
289 * Also, get abs(errno) to return to t 294 * Also, get abs(errno) to return to the process.
290 */ 295 */
291 sub %g0, %o0, %o0 296 sub %g0, %o0, %o0
292 stx %o0, [%sp + PTREGS_OFF + PT_V9 297 stx %o0, [%sp + PTREGS_OFF + PT_V9_I0]
293 ba,pt %xcc, 3b 298 ba,pt %xcc, 3b
294 or %g3, %g2, %g3 299 or %g3, %g2, %g3
295 300
296 linux_syscall_trace2: 301 linux_syscall_trace2:
297 call syscall_trace_leave 302 call syscall_trace_leave
298 add %sp, PTREGS_OFF, %o0 303 add %sp, PTREGS_OFF, %o0
299 stx %l1, [%sp + PTREGS_OFF + PT_V9 304 stx %l1, [%sp + PTREGS_OFF + PT_V9_TPC]
300 ba,pt %xcc, rtrap 305 ba,pt %xcc, rtrap
301 stx %l2, [%sp + PTREGS_OFF + PT_V9 306 stx %l2, [%sp + PTREGS_OFF + PT_V9_TNPC]
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.