1/* SPDX-License-Identifier: GPL-2.0 */ 2 /* SunOS's execv() call only specifies the argv argument, the 3 * environment settings are the same as the calling processes. 4 */ 5sys64_execve: 6 set sys_execve, %g1 7 jmpl %g1, %g0 8 flushw 9 10sys64_execveat: 11 set sys_execveat, %g1 12 jmpl %g1, %g0 13 flushw 14 15#ifdef CONFIG_COMPAT 16sunos_execv: 17 mov %g0, %o2 18sys32_execve: 19 set compat_sys_execve, %g1 20 jmpl %g1, %g0 21 flushw 22 23sys32_execveat: 24 set compat_sys_execveat, %g1 25 jmpl %g1, %g0 26 flushw 27#endif 28 29 .align 32 30#ifdef CONFIG_COMPAT 31sys32_sigstack: 32 ba,pt %xcc, do_sys32_sigstack 33 mov %i6, %o2 34#endif 35 .align 32 36#ifdef CONFIG_COMPAT 37sys32_sigreturn: 38 add %sp, PTREGS_OFF, %o0 39 call do_sigreturn32 40 add %o7, 1f-.-4, %o7 41 nop 42#endif 43sys_rt_sigreturn: 44 add %sp, PTREGS_OFF, %o0 45 call do_rt_sigreturn 46 add %o7, 1f-.-4, %o7 47 nop 48#ifdef CONFIG_COMPAT 49sys32_rt_sigreturn: 50 add %sp, PTREGS_OFF, %o0 51 call do_rt_sigreturn32 52 add %o7, 1f-.-4, %o7 53 nop 54#endif 55 .align 32 561: ldx [%g6 + TI_FLAGS], %l5 57 andcc %l5, (_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT|_TIF_SYSCALL_TRACEPOINT|_TIF_NOHZ), %g0 58 be,pt %icc, rtrap 59 nop 60 call syscall_trace_leave 61 add %sp, PTREGS_OFF, %o0 62 ba,pt %xcc, rtrap 63 nop 64 65 /* This is how fork() was meant to be done, 8 instruction entry. 66 * 67 * I questioned the following code briefly, let me clear things 68 * up so you must not reason on it like I did. 69 * 70 * Know the fork_kpsr etc. we use in the sparc32 port? We don't 71 * need it here because the only piece of window state we copy to 72 * the child is the CWP register. Even if the parent sleeps, 73 * we are safe because we stuck it into pt_regs of the parent 74 * so it will not change. 75 * 76 * XXX This raises the question, whether we can do the same on 77 * XXX sparc32 to get rid of fork_kpsr _and_ fork_kwim. The 78 * XXX answer is yes. We stick fork_kpsr in UREG_G0 and 79 * XXX fork_kwim in UREG_G1 (global registers are considered 80 * XXX volatile across a system call in the sparc ABI I think 81 * XXX if it isn't we can use regs->y instead, anyone who depends 82 * XXX upon the Y register being preserved across a fork deserves 83 * XXX to lose). 84 * 85 * In fact we should take advantage of that fact for other things 86 * during system calls... 87 */ 88 .align 32 89sys_vfork: /* Under Linux, vfork and fork are just special cases of clone. */ 90 sethi %hi(0x4000 | 0x0100 | SIGCHLD), %o0 91 or %o0, %lo(0x4000 | 0x0100 | SIGCHLD), %o0 92 ba,pt %xcc, sys_clone 93sys_fork: 94 clr %o1 95 mov SIGCHLD, %o0 96sys_clone: 97 flushw 98 movrz %o1, %fp, %o1 99 mov 0, %o3 100 ba,pt %xcc, sparc_do_fork 101 add %sp, PTREGS_OFF, %o2 102 103 .globl ret_from_fork 104ret_from_fork: 105 /* Clear current_thread_info()->new_child. */ 106 stb %g0, [%g6 + TI_NEW_CHILD] 107 call schedule_tail 108 mov %g7, %o0 109 ldx [%sp + PTREGS_OFF + PT_V9_I0], %o0 110 brnz,pt %o0, ret_sys_call 111 ldx [%g6 + TI_FLAGS], %l0 112 ldx [%sp + PTREGS_OFF + PT_V9_G1], %l1 113 call %l1 114 ldx [%sp + PTREGS_OFF + PT_V9_G2], %o0 115 ba,pt %xcc, ret_sys_call 116 mov 0, %o0 117 118 .globl sparc_exit_group 119 .type sparc_exit_group,#function 120sparc_exit_group: 121 sethi %hi(sys_exit_group), %g7 122 ba,pt %xcc, 1f 123 or %g7, %lo(sys_exit_group), %g7 124 .size sparc_exit_group,.-sparc_exit_group 125 126 .globl sparc_exit 127 .type sparc_exit,#function 128sparc_exit: 129 sethi %hi(sys_exit), %g7 130 or %g7, %lo(sys_exit), %g7 1311: rdpr %pstate, %g2 132 wrpr %g2, PSTATE_IE, %pstate 133 rdpr %otherwin, %g1 134 rdpr %cansave, %g3 135 add %g3, %g1, %g3 136 wrpr %g3, 0x0, %cansave 137 wrpr %g0, 0x0, %otherwin 138 wrpr %g2, 0x0, %pstate 139 jmpl %g7, %g0 140 stb %g0, [%g6 + TI_WSAVED] 141 .size sparc_exit,.-sparc_exit 142 143linux_sparc_ni_syscall: 144 sethi %hi(sys_ni_syscall), %l7 145 ba,pt %xcc, 4f 146 or %l7, %lo(sys_ni_syscall), %l7 147 148linux_syscall_trace32: 149 call syscall_trace_enter 150 add %sp, PTREGS_OFF, %o0 151 brnz,pn %o0, 3f 152 mov -ENOSYS, %o0 153 154 /* Syscall tracing can modify the registers. */ 155 ldx [%sp + PTREGS_OFF + PT_V9_G1], %g1 156 sethi %hi(sys_call_table32), %l7 157 ldx [%sp + PTREGS_OFF + PT_V9_I0], %i0 158 or %l7, %lo(sys_call_table32), %l7 159 ldx [%sp + PTREGS_OFF + PT_V9_I1], %i1 160 ldx [%sp + PTREGS_OFF + PT_V9_I2], %i2 161 ldx [%sp + PTREGS_OFF + PT_V9_I3], %i3 162 ldx [%sp + PTREGS_OFF + PT_V9_I4], %i4 163 ldx [%sp + PTREGS_OFF + PT_V9_I5], %i5 164 165 cmp %g1, NR_syscalls 166 bgeu,pn %xcc, 3f 167 mov -ENOSYS, %o0 168 169 sll %g1, 2, %l4 170 srl %i0, 0, %o0 171 lduw [%l7 + %l4], %l7 172 srl %i4, 0, %o4 173 srl %i1, 0, %o1 174 srl %i2, 0, %o2 175 ba,pt %xcc, 5f 176 srl %i3, 0, %o3 177 178linux_syscall_trace: 179 call syscall_trace_enter 180 add %sp, PTREGS_OFF, %o0 181 brnz,pn %o0, 3f 182 mov -ENOSYS, %o0 183 184 /* Syscall tracing can modify the registers. */ 185 ldx [%sp + PTREGS_OFF + PT_V9_G1], %g1 186 sethi %hi(sys_call_table64), %l7 187 ldx [%sp + PTREGS_OFF + PT_V9_I0], %i0 188 or %l7, %lo(sys_call_table64), %l7 189 ldx [%sp + PTREGS_OFF + PT_V9_I1], %i1 190 ldx [%sp + PTREGS_OFF + PT_V9_I2], %i2 191 ldx [%sp + PTREGS_OFF + PT_V9_I3], %i3 192 ldx [%sp + PTREGS_OFF + PT_V9_I4], %i4 193 ldx [%sp + PTREGS_OFF + PT_V9_I5], %i5 194 195 cmp %g1, NR_syscalls 196 bgeu,pn %xcc, 3f 197 mov -ENOSYS, %o0 198 199 sll %g1, 2, %l4 200 mov %i0, %o0 201 lduw [%l7 + %l4], %l7 202 mov %i1, %o1 203 mov %i2, %o2 204 mov %i3, %o3 205 b,pt %xcc, 2f 206 mov %i4, %o4 207 208 209 /* Linux 32-bit system calls enter here... */ 210 .align 32 211 .globl linux_sparc_syscall32 212linux_sparc_syscall32: 213 /* Direct access to user regs, much faster. */ 214 cmp %g1, NR_syscalls ! IEU1 Group 215 bgeu,pn %xcc, linux_sparc_ni_syscall ! CTI 216 srl %i0, 0, %o0 ! IEU0 217 sll %g1, 2, %l4 ! IEU0 Group 218 srl %i4, 0, %o4 ! IEU1 219 lduw [%l7 + %l4], %l7 ! Load 220 srl %i1, 0, %o1 ! IEU0 Group 221 ldx [%g6 + TI_FLAGS], %l0 ! Load 222 223 srl %i3, 0, %o3 ! IEU0 224 srl %i2, 0, %o2 ! IEU0 Group 225 andcc %l0, (_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT|_TIF_SYSCALL_TRACEPOINT|_TIF_NOHZ), %g0 226 bne,pn %icc, linux_syscall_trace32 ! CTI 227 mov %i0, %l5 ! IEU1 2285: call %l7 ! CTI Group brk forced 229 srl %i5, 0, %o5 ! IEU1 230 ba,pt %xcc, 3f 231 sra %o0, 0, %o0 232 233 /* Linux native system calls enter here... */ 234 .align 32 235 .globl linux_sparc_syscall 236linux_sparc_syscall: 237 /* Direct access to user regs, much faster. */ 238 cmp %g1, NR_syscalls ! IEU1 Group 239 bgeu,pn %xcc, linux_sparc_ni_syscall ! CTI 240 mov %i0, %o0 ! IEU0 241 sll %g1, 2, %l4 ! IEU0 Group 242 mov %i1, %o1 ! IEU1 243 lduw [%l7 + %l4], %l7 ! Load 2444: mov %i2, %o2 ! IEU0 Group 245 ldx [%g6 + TI_FLAGS], %l0 ! Load 246 247 mov %i3, %o3 ! IEU1 248 mov %i4, %o4 ! IEU0 Group 249 andcc %l0, (_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT|_TIF_SYSCALL_TRACEPOINT|_TIF_NOHZ), %g0 250 bne,pn %icc, linux_syscall_trace ! CTI Group 251 mov %i0, %l5 ! IEU0 2522: call %l7 ! CTI Group brk forced 253 mov %i5, %o5 ! IEU0 254 nop 255 2563: stx %o0, [%sp + PTREGS_OFF + PT_V9_I0] 257ret_sys_call: 258 ldx [%sp + PTREGS_OFF + PT_V9_TSTATE], %g3 259 mov %ulo(TSTATE_XCARRY | TSTATE_ICARRY), %g2 260 sllx %g2, 32, %g2 261 262 cmp %o0, -ERESTART_RESTARTBLOCK 263 bgeu,pn %xcc, 1f 264 andcc %l0, (_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT|_TIF_SYSCALL_TRACEPOINT|_TIF_NOHZ), %g0 265 ldx [%sp + PTREGS_OFF + PT_V9_TNPC], %l1 ! pc = npc 266 2672: 268 /* System call success, clear Carry condition code. */ 269 andn %g3, %g2, %g3 2703: 271 stx %g3, [%sp + PTREGS_OFF + PT_V9_TSTATE] 272 bne,pn %icc, linux_syscall_trace2 273 add %l1, 0x4, %l2 ! npc = npc+4 274 stx %l1, [%sp + PTREGS_OFF + PT_V9_TPC] 275 ba,pt %xcc, rtrap 276 stx %l2, [%sp + PTREGS_OFF + PT_V9_TNPC] 277 2781: 279 /* Check if force_successful_syscall_return() 280 * was invoked. 281 */ 282 ldub [%g6 + TI_SYS_NOERROR], %l2 283 brnz,pn %l2, 2b 284 ldx [%sp + PTREGS_OFF + PT_V9_TNPC], %l1 ! pc = npc 285 /* System call failure, set Carry condition code. 286 * Also, get abs(errno) to return to the process. 287 */ 288 sub %g0, %o0, %o0 289 stx %o0, [%sp + PTREGS_OFF + PT_V9_I0] 290 ba,pt %xcc, 3b 291 or %g3, %g2, %g3 292 293linux_syscall_trace2: 294 call syscall_trace_leave 295 add %sp, PTREGS_OFF, %o0 296 stx %l1, [%sp + PTREGS_OFF + PT_V9_TPC] 297 ba,pt %xcc, rtrap 298 stx %l2, [%sp + PTREGS_OFF + PT_V9_TNPC] 299