1 /* SunOS's execv() call only specifies the argv argument, the 2 * environment settings are the same as the calling processes. 3 */ 4sys64_execve: 5 set sys_execve, %g1 6 jmpl %g1, %g0 7 flushw 8 9#ifdef CONFIG_COMPAT 10sunos_execv: 11 mov %g0, %o2 12sys32_execve: 13 set compat_sys_execve, %g1 14 jmpl %g1, %g0 15 flushw 16#endif 17 18 .align 32 19sys_sparc_pipe: 20 ba,pt %xcc, sys_sparc_pipe_real 21 add %sp, PTREGS_OFF, %o0 22sys_nis_syscall: 23 ba,pt %xcc, c_sys_nis_syscall 24 add %sp, PTREGS_OFF, %o0 25sys_memory_ordering: 26 ba,pt %xcc, sparc_memory_ordering 27 add %sp, PTREGS_OFF, %o1 28#ifdef CONFIG_COMPAT 29sys32_sigstack: 30 ba,pt %xcc, do_sys32_sigstack 31 mov %i6, %o2 32#endif 33 .align 32 34#ifdef CONFIG_COMPAT 35sys32_sigreturn: 36 add %sp, PTREGS_OFF, %o0 37 call do_sigreturn32 38 add %o7, 1f-.-4, %o7 39 nop 40#endif 41sys_rt_sigreturn: 42 add %sp, PTREGS_OFF, %o0 43 call do_rt_sigreturn 44 add %o7, 1f-.-4, %o7 45 nop 46#ifdef CONFIG_COMPAT 47sys32_rt_sigreturn: 48 add %sp, PTREGS_OFF, %o0 49 call do_rt_sigreturn32 50 add %o7, 1f-.-4, %o7 51 nop 52#endif 53 .align 32 541: ldx [%g6 + TI_FLAGS], %l5 55 andcc %l5, (_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT|_TIF_SYSCALL_TRACEPOINT|_TIF_NOHZ), %g0 56 be,pt %icc, rtrap 57 nop 58 call syscall_trace_leave 59 add %sp, PTREGS_OFF, %o0 60 ba,pt %xcc, rtrap 61 nop 62 63 /* This is how fork() was meant to be done, 8 instruction entry. 64 * 65 * I questioned the following code briefly, let me clear things 66 * up so you must not reason on it like I did. 67 * 68 * Know the fork_kpsr etc. we use in the sparc32 port? We don't 69 * need it here because the only piece of window state we copy to 70 * the child is the CWP register. Even if the parent sleeps, 71 * we are safe because we stuck it into pt_regs of the parent 72 * so it will not change. 73 * 74 * XXX This raises the question, whether we can do the same on 75 * XXX sparc32 to get rid of fork_kpsr _and_ fork_kwim. The 76 * XXX answer is yes. We stick fork_kpsr in UREG_G0 and 77 * XXX fork_kwim in UREG_G1 (global registers are considered 78 * XXX volatile across a system call in the sparc ABI I think 79 * XXX if it isn't we can use regs->y instead, anyone who depends 80 * XXX upon the Y register being preserved across a fork deserves 81 * XXX to lose). 82 * 83 * In fact we should take advantage of that fact for other things 84 * during system calls... 85 */ 86 .align 32 87sys_vfork: /* Under Linux, vfork and fork are just special cases of clone. */ 88 sethi %hi(0x4000 | 0x0100 | SIGCHLD), %o0 89 or %o0, %lo(0x4000 | 0x0100 | SIGCHLD), %o0 90 ba,pt %xcc, sys_clone 91sys_fork: 92 clr %o1 93 mov SIGCHLD, %o0 94sys_clone: 95 flushw 96 movrz %o1, %fp, %o1 97 mov 0, %o3 98 ba,pt %xcc, sparc_do_fork 99 add %sp, PTREGS_OFF, %o2 100 101 .globl ret_from_fork 102ret_from_fork: 103 /* Clear current_thread_info()->new_child. */ 104 stb %g0, [%g6 + TI_NEW_CHILD] 105 call schedule_tail 106 mov %g7, %o0 107 ldx [%sp + PTREGS_OFF + PT_V9_I0], %o0 108 brnz,pt %o0, ret_sys_call 109 ldx [%g6 + TI_FLAGS], %l0 110 ldx [%sp + PTREGS_OFF + PT_V9_G1], %l1 111 call %l1 112 ldx [%sp + PTREGS_OFF + PT_V9_G2], %o0 113 ba,pt %xcc, ret_sys_call 114 mov 0, %o0 115 116 .globl sparc_exit_group 117 .type sparc_exit_group,#function 118sparc_exit_group: 119 sethi %hi(sys_exit_group), %g7 120 ba,pt %xcc, 1f 121 or %g7, %lo(sys_exit_group), %g7 122 .size sparc_exit_group,.-sparc_exit_group 123 124 .globl sparc_exit 125 .type sparc_exit,#function 126sparc_exit: 127 sethi %hi(sys_exit), %g7 128 or %g7, %lo(sys_exit), %g7 1291: rdpr %pstate, %g2 130 wrpr %g2, PSTATE_IE, %pstate 131 rdpr %otherwin, %g1 132 rdpr %cansave, %g3 133 add %g3, %g1, %g3 134 wrpr %g3, 0x0, %cansave 135 wrpr %g0, 0x0, %otherwin 136 wrpr %g2, 0x0, %pstate 137 jmpl %g7, %g0 138 stb %g0, [%g6 + TI_WSAVED] 139 .size sparc_exit,.-sparc_exit 140 141linux_sparc_ni_syscall: 142 sethi %hi(sys_ni_syscall), %l7 143 ba,pt %xcc, 4f 144 or %l7, %lo(sys_ni_syscall), %l7 145 146linux_syscall_trace32: 147 call syscall_trace_enter 148 add %sp, PTREGS_OFF, %o0 149 brnz,pn %o0, 3f 150 mov -ENOSYS, %o0 151 srl %i0, 0, %o0 152 srl %i4, 0, %o4 153 srl %i1, 0, %o1 154 srl %i2, 0, %o2 155 ba,pt %xcc, 5f 156 srl %i3, 0, %o3 157 158linux_syscall_trace: 159 call syscall_trace_enter 160 add %sp, PTREGS_OFF, %o0 161 brnz,pn %o0, 3f 162 mov -ENOSYS, %o0 163 mov %i0, %o0 164 mov %i1, %o1 165 mov %i2, %o2 166 mov %i3, %o3 167 b,pt %xcc, 2f 168 mov %i4, %o4 169 170 171 /* Linux 32-bit system calls enter here... */ 172 .align 32 173 .globl linux_sparc_syscall32 174linux_sparc_syscall32: 175 /* Direct access to user regs, much faster. */ 176 cmp %g1, NR_syscalls ! IEU1 Group 177 bgeu,pn %xcc, linux_sparc_ni_syscall ! CTI 178 srl %i0, 0, %o0 ! IEU0 179 sll %g1, 2, %l4 ! IEU0 Group 180 srl %i4, 0, %o4 ! IEU1 181 lduw [%l7 + %l4], %l7 ! Load 182 srl %i1, 0, %o1 ! IEU0 Group 183 ldx [%g6 + TI_FLAGS], %l0 ! Load 184 185 srl %i3, 0, %o3 ! IEU0 186 srl %i2, 0, %o2 ! IEU0 Group 187 andcc %l0, (_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT|_TIF_SYSCALL_TRACEPOINT|_TIF_NOHZ), %g0 188 bne,pn %icc, linux_syscall_trace32 ! CTI 189 mov %i0, %l5 ! IEU1 1905: call %l7 ! CTI Group brk forced 191 srl %i5, 0, %o5 ! IEU1 192 ba,pt %xcc, 3f 193 sra %o0, 0, %o0 194 195 /* Linux native system calls enter here... */ 196 .align 32 197 .globl linux_sparc_syscall 198linux_sparc_syscall: 199 /* Direct access to user regs, much faster. */ 200 cmp %g1, NR_syscalls ! IEU1 Group 201 bgeu,pn %xcc, linux_sparc_ni_syscall ! CTI 202 mov %i0, %o0 ! IEU0 203 sll %g1, 2, %l4 ! IEU0 Group 204 mov %i1, %o1 ! IEU1 205 lduw [%l7 + %l4], %l7 ! Load 2064: mov %i2, %o2 ! IEU0 Group 207 ldx [%g6 + TI_FLAGS], %l0 ! Load 208 209 mov %i3, %o3 ! IEU1 210 mov %i4, %o4 ! IEU0 Group 211 andcc %l0, (_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT|_TIF_SYSCALL_TRACEPOINT|_TIF_NOHZ), %g0 212 bne,pn %icc, linux_syscall_trace ! CTI Group 213 mov %i0, %l5 ! IEU0 2142: call %l7 ! CTI Group brk forced 215 mov %i5, %o5 ! IEU0 216 nop 217 2183: stx %o0, [%sp + PTREGS_OFF + PT_V9_I0] 219ret_sys_call: 220 ldx [%sp + PTREGS_OFF + PT_V9_TSTATE], %g3 221 mov %ulo(TSTATE_XCARRY | TSTATE_ICARRY), %g2 222 sllx %g2, 32, %g2 223 224 cmp %o0, -ERESTART_RESTARTBLOCK 225 bgeu,pn %xcc, 1f 226 andcc %l0, (_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT|_TIF_SYSCALL_TRACEPOINT|_TIF_NOHZ), %g0 227 ldx [%sp + PTREGS_OFF + PT_V9_TNPC], %l1 ! pc = npc 228 2292: 230 /* System call success, clear Carry condition code. */ 231 andn %g3, %g2, %g3 2323: 233 stx %g3, [%sp + PTREGS_OFF + PT_V9_TSTATE] 234 bne,pn %icc, linux_syscall_trace2 235 add %l1, 0x4, %l2 ! npc = npc+4 236 stx %l1, [%sp + PTREGS_OFF + PT_V9_TPC] 237 ba,pt %xcc, rtrap 238 stx %l2, [%sp + PTREGS_OFF + PT_V9_TNPC] 239 2401: 241 /* Check if force_successful_syscall_return() 242 * was invoked. 243 */ 244 ldub [%g6 + TI_SYS_NOERROR], %l2 245 brnz,pn %l2, 2b 246 ldx [%sp + PTREGS_OFF + PT_V9_TNPC], %l1 ! pc = npc 247 /* System call failure, set Carry condition code. 248 * Also, get abs(errno) to return to the process. 249 */ 250 sub %g0, %o0, %o0 251 stx %o0, [%sp + PTREGS_OFF + PT_V9_I0] 252 ba,pt %xcc, 3b 253 or %g3, %g2, %g3 254 255linux_syscall_trace2: 256 call syscall_trace_leave 257 add %sp, PTREGS_OFF, %o0 258 stx %l1, [%sp + PTREGS_OFF + PT_V9_TPC] 259 ba,pt %xcc, rtrap 260 stx %l2, [%sp + PTREGS_OFF + PT_V9_TNPC] 261