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: 90 flushw 91 ba,pt %xcc, sparc_vfork 92 add %sp, PTREGS_OFF, %o0 93 94 .align 32 95sys_fork: 96 flushw 97 ba,pt %xcc, sparc_fork 98 add %sp, PTREGS_OFF, %o0 99 100 .align 32 101sys_clone: 102 flushw 103 ba,pt %xcc, sparc_clone 104 add %sp, PTREGS_OFF, %o0 105 106 .align 32 107__sys_clone3: 108 flushw 109 ba,pt %xcc, sparc_clone3 110 add %sp, PTREGS_OFF, %o0 111 112 .globl ret_from_fork 113ret_from_fork: 114 /* Clear current_thread_info()->new_child. */ 115 stb %g0, [%g6 + TI_NEW_CHILD] 116 call schedule_tail 117 mov %g7, %o0 118 ldx [%sp + PTREGS_OFF + PT_V9_I0], %o0 119 brnz,pt %o0, ret_sys_call 120 ldx [%g6 + TI_FLAGS], %l0 121 ldx [%sp + PTREGS_OFF + PT_V9_G1], %l1 122 brz,pt %l1, ret_sys_call 123 nop 124 call %l1 125 ldx [%sp + PTREGS_OFF + PT_V9_G2], %o0 126 ba,pt %xcc, ret_sys_call 127 mov 0, %o0 128 129 .globl sparc_exit_group 130 .type sparc_exit_group,#function 131sparc_exit_group: 132 sethi %hi(sys_exit_group), %g7 133 ba,pt %xcc, 1f 134 or %g7, %lo(sys_exit_group), %g7 135 .size sparc_exit_group,.-sparc_exit_group 136 137 .globl sparc_exit 138 .type sparc_exit,#function 139sparc_exit: 140 sethi %hi(sys_exit), %g7 141 or %g7, %lo(sys_exit), %g7 1421: rdpr %pstate, %g2 143 wrpr %g2, PSTATE_IE, %pstate 144 rdpr %otherwin, %g1 145 rdpr %cansave, %g3 146 add %g3, %g1, %g3 147 wrpr %g3, 0x0, %cansave 148 wrpr %g0, 0x0, %otherwin 149 wrpr %g2, 0x0, %pstate 150 jmpl %g7, %g0 151 stb %g0, [%g6 + TI_WSAVED] 152 .size sparc_exit,.-sparc_exit 153 154linux_sparc_ni_syscall: 155 sethi %hi(sys_ni_syscall), %l7 156 ba,pt %xcc, 4f 157 or %l7, %lo(sys_ni_syscall), %l7 158 159linux_syscall_trace32: 160 call syscall_trace_enter 161 add %sp, PTREGS_OFF, %o0 162 brnz,pn %o0, 3f 163 mov -ENOSYS, %o0 164 165 /* Syscall tracing can modify the registers. */ 166 ldx [%sp + PTREGS_OFF + PT_V9_G1], %g1 167 sethi %hi(sys_call_table32), %l7 168 ldx [%sp + PTREGS_OFF + PT_V9_I0], %i0 169 or %l7, %lo(sys_call_table32), %l7 170 ldx [%sp + PTREGS_OFF + PT_V9_I1], %i1 171 ldx [%sp + PTREGS_OFF + PT_V9_I2], %i2 172 ldx [%sp + PTREGS_OFF + PT_V9_I3], %i3 173 ldx [%sp + PTREGS_OFF + PT_V9_I4], %i4 174 ldx [%sp + PTREGS_OFF + PT_V9_I5], %i5 175 176 cmp %g1, NR_syscalls 177 bgeu,pn %xcc, 3f 178 mov -ENOSYS, %o0 179 180 sll %g1, 2, %l4 181 srl %i0, 0, %o0 182 lduw [%l7 + %l4], %l7 183 srl %i4, 0, %o4 184 srl %i1, 0, %o1 185 srl %i2, 0, %o2 186 ba,pt %xcc, 5f 187 srl %i3, 0, %o3 188 189linux_syscall_trace: 190 call syscall_trace_enter 191 add %sp, PTREGS_OFF, %o0 192 brnz,pn %o0, 3f 193 mov -ENOSYS, %o0 194 195 /* Syscall tracing can modify the registers. */ 196 ldx [%sp + PTREGS_OFF + PT_V9_G1], %g1 197 sethi %hi(sys_call_table64), %l7 198 ldx [%sp + PTREGS_OFF + PT_V9_I0], %i0 199 or %l7, %lo(sys_call_table64), %l7 200 ldx [%sp + PTREGS_OFF + PT_V9_I1], %i1 201 ldx [%sp + PTREGS_OFF + PT_V9_I2], %i2 202 ldx [%sp + PTREGS_OFF + PT_V9_I3], %i3 203 ldx [%sp + PTREGS_OFF + PT_V9_I4], %i4 204 ldx [%sp + PTREGS_OFF + PT_V9_I5], %i5 205 206 cmp %g1, NR_syscalls 207 bgeu,pn %xcc, 3f 208 mov -ENOSYS, %o0 209 210 sll %g1, 2, %l4 211 mov %i0, %o0 212 lduw [%l7 + %l4], %l7 213 mov %i1, %o1 214 mov %i2, %o2 215 mov %i3, %o3 216 b,pt %xcc, 2f 217 mov %i4, %o4 218 219 220 /* Linux 32-bit system calls enter here... */ 221 .align 32 222 .globl linux_sparc_syscall32 223linux_sparc_syscall32: 224 /* Direct access to user regs, much faster. */ 225 cmp %g1, NR_syscalls ! IEU1 Group 226 bgeu,pn %xcc, linux_sparc_ni_syscall ! CTI 227 srl %i0, 0, %o0 ! IEU0 228 sll %g1, 2, %l4 ! IEU0 Group 229 srl %i4, 0, %o4 ! IEU1 230 lduw [%l7 + %l4], %l7 ! Load 231 srl %i1, 0, %o1 ! IEU0 Group 232 ldx [%g6 + TI_FLAGS], %l0 ! Load 233 234 srl %i3, 0, %o3 ! IEU0 235 srl %i2, 0, %o2 ! IEU0 Group 236 andcc %l0, (_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT|_TIF_SYSCALL_TRACEPOINT|_TIF_NOHZ), %g0 237 bne,pn %icc, linux_syscall_trace32 ! CTI 238 mov %i0, %l5 ! IEU1 2395: call %l7 ! CTI Group brk forced 240 srl %i5, 0, %o5 ! IEU1 241 ba,pt %xcc, 3f 242 sra %o0, 0, %o0 243 244 /* Linux native system calls enter here... */ 245 .align 32 246 .globl linux_sparc_syscall 247linux_sparc_syscall: 248 /* Direct access to user regs, much faster. */ 249 cmp %g1, NR_syscalls ! IEU1 Group 250 bgeu,pn %xcc, linux_sparc_ni_syscall ! CTI 251 mov %i0, %o0 ! IEU0 252 sll %g1, 2, %l4 ! IEU0 Group 253 mov %i1, %o1 ! IEU1 254 lduw [%l7 + %l4], %l7 ! Load 2554: mov %i2, %o2 ! IEU0 Group 256 ldx [%g6 + TI_FLAGS], %l0 ! Load 257 258 mov %i3, %o3 ! IEU1 259 mov %i4, %o4 ! IEU0 Group 260 andcc %l0, (_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT|_TIF_SYSCALL_TRACEPOINT|_TIF_NOHZ), %g0 261 bne,pn %icc, linux_syscall_trace ! CTI Group 262 mov %i0, %l5 ! IEU0 2632: call %l7 ! CTI Group brk forced 264 mov %i5, %o5 ! IEU0 265 nop 266 2673: stx %o0, [%sp + PTREGS_OFF + PT_V9_I0] 268ret_sys_call: 269 ldx [%sp + PTREGS_OFF + PT_V9_TSTATE], %g3 270 mov %ulo(TSTATE_XCARRY | TSTATE_ICARRY), %g2 271 sllx %g2, 32, %g2 272 273 cmp %o0, -ERESTART_RESTARTBLOCK 274 bgeu,pn %xcc, 1f 275 andcc %l0, (_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT|_TIF_SYSCALL_TRACEPOINT|_TIF_NOHZ), %g0 276 ldx [%sp + PTREGS_OFF + PT_V9_TNPC], %l1 ! pc = npc 277 2782: 279 /* System call success, clear Carry condition code. */ 280 andn %g3, %g2, %g3 2813: 282 stx %g3, [%sp + PTREGS_OFF + PT_V9_TSTATE] 283 bne,pn %icc, linux_syscall_trace2 284 add %l1, 0x4, %l2 ! npc = npc+4 285 stx %l1, [%sp + PTREGS_OFF + PT_V9_TPC] 286 ba,pt %xcc, rtrap 287 stx %l2, [%sp + PTREGS_OFF + PT_V9_TNPC] 288 2891: 290 /* Check if force_successful_syscall_return() 291 * was invoked. 292 */ 293 ldub [%g6 + TI_SYS_NOERROR], %l2 294 brnz,pn %l2, 2b 295 ldx [%sp + PTREGS_OFF + PT_V9_TNPC], %l1 ! pc = npc 296 /* System call failure, set Carry condition code. 297 * Also, get abs(errno) to return to the process. 298 */ 299 sub %g0, %o0, %o0 300 stx %o0, [%sp + PTREGS_OFF + PT_V9_I0] 301 ba,pt %xcc, 3b 302 or %g3, %g2, %g3 303 304linux_syscall_trace2: 305 call syscall_trace_leave 306 add %sp, PTREGS_OFF, %o0 307 stx %l1, [%sp + PTREGS_OFF + PT_V9_TPC] 308 ba,pt %xcc, rtrap 309 stx %l2, [%sp + PTREGS_OFF + PT_V9_TNPC] 310