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 9sys64_execveat: 10 set sys_execveat, %g1 11 jmpl %g1, %g0 12 flushw 13 14#ifdef CONFIG_COMPAT 15sunos_execv: 16 mov %g0, %o2 17sys32_execve: 18 set compat_sys_execve, %g1 19 jmpl %g1, %g0 20 flushw 21 22sys32_execveat: 23 set compat_sys_execveat, %g1 24 jmpl %g1, %g0 25 flushw 26#endif 27 28 .align 32 29sys_sparc_pipe: 30 ba,pt %xcc, sys_sparc_pipe_real 31 add %sp, PTREGS_OFF, %o0 32sys_nis_syscall: 33 ba,pt %xcc, c_sys_nis_syscall 34 add %sp, PTREGS_OFF, %o0 35sys_memory_ordering: 36 ba,pt %xcc, sparc_memory_ordering 37 add %sp, PTREGS_OFF, %o1 38#ifdef CONFIG_COMPAT 39sys32_sigstack: 40 ba,pt %xcc, do_sys32_sigstack 41 mov %i6, %o2 42#endif 43 .align 32 44#ifdef CONFIG_COMPAT 45sys32_sigreturn: 46 add %sp, PTREGS_OFF, %o0 47 call do_sigreturn32 48 add %o7, 1f-.-4, %o7 49 nop 50#endif 51sys_rt_sigreturn: 52 add %sp, PTREGS_OFF, %o0 53 call do_rt_sigreturn 54 add %o7, 1f-.-4, %o7 55 nop 56#ifdef CONFIG_COMPAT 57sys32_rt_sigreturn: 58 add %sp, PTREGS_OFF, %o0 59 call do_rt_sigreturn32 60 add %o7, 1f-.-4, %o7 61 nop 62#endif 63 .align 32 641: ldx [%g6 + TI_FLAGS], %l5 65 andcc %l5, (_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT|_TIF_SYSCALL_TRACEPOINT|_TIF_NOHZ), %g0 66 be,pt %icc, rtrap 67 nop 68 call syscall_trace_leave 69 add %sp, PTREGS_OFF, %o0 70 ba,pt %xcc, rtrap 71 nop 72 73 /* This is how fork() was meant to be done, 8 instruction entry. 74 * 75 * I questioned the following code briefly, let me clear things 76 * up so you must not reason on it like I did. 77 * 78 * Know the fork_kpsr etc. we use in the sparc32 port? We don't 79 * need it here because the only piece of window state we copy to 80 * the child is the CWP register. Even if the parent sleeps, 81 * we are safe because we stuck it into pt_regs of the parent 82 * so it will not change. 83 * 84 * XXX This raises the question, whether we can do the same on 85 * XXX sparc32 to get rid of fork_kpsr _and_ fork_kwim. The 86 * XXX answer is yes. We stick fork_kpsr in UREG_G0 and 87 * XXX fork_kwim in UREG_G1 (global registers are considered 88 * XXX volatile across a system call in the sparc ABI I think 89 * XXX if it isn't we can use regs->y instead, anyone who depends 90 * XXX upon the Y register being preserved across a fork deserves 91 * XXX to lose). 92 * 93 * In fact we should take advantage of that fact for other things 94 * during system calls... 95 */ 96 .align 32 97sys_vfork: /* Under Linux, vfork and fork are just special cases of clone. */ 98 sethi %hi(0x4000 | 0x0100 | SIGCHLD), %o0 99 or %o0, %lo(0x4000 | 0x0100 | SIGCHLD), %o0 100 ba,pt %xcc, sys_clone 101sys_fork: 102 clr %o1 103 mov SIGCHLD, %o0 104sys_clone: 105 flushw 106 movrz %o1, %fp, %o1 107 mov 0, %o3 108 ba,pt %xcc, sparc_do_fork 109 add %sp, PTREGS_OFF, %o2 110 111 .globl ret_from_fork 112ret_from_fork: 113 /* Clear current_thread_info()->new_child. */ 114 stb %g0, [%g6 + TI_NEW_CHILD] 115 call schedule_tail 116 mov %g7, %o0 117 ldx [%sp + PTREGS_OFF + PT_V9_I0], %o0 118 brnz,pt %o0, ret_sys_call 119 ldx [%g6 + TI_FLAGS], %l0 120 ldx [%sp + PTREGS_OFF + PT_V9_G1], %l1 121 call %l1 122 ldx [%sp + PTREGS_OFF + PT_V9_G2], %o0 123 ba,pt %xcc, ret_sys_call 124 mov 0, %o0 125 126 .globl sparc_exit_group 127 .type sparc_exit_group,#function 128sparc_exit_group: 129 sethi %hi(sys_exit_group), %g7 130 ba,pt %xcc, 1f 131 or %g7, %lo(sys_exit_group), %g7 132 .size sparc_exit_group,.-sparc_exit_group 133 134 .globl sparc_exit 135 .type sparc_exit,#function 136sparc_exit: 137 sethi %hi(sys_exit), %g7 138 or %g7, %lo(sys_exit), %g7 1391: rdpr %pstate, %g2 140 wrpr %g2, PSTATE_IE, %pstate 141 rdpr %otherwin, %g1 142 rdpr %cansave, %g3 143 add %g3, %g1, %g3 144 wrpr %g3, 0x0, %cansave 145 wrpr %g0, 0x0, %otherwin 146 wrpr %g2, 0x0, %pstate 147 jmpl %g7, %g0 148 stb %g0, [%g6 + TI_WSAVED] 149 .size sparc_exit,.-sparc_exit 150 151linux_sparc_ni_syscall: 152 sethi %hi(sys_ni_syscall), %l7 153 ba,pt %xcc, 4f 154 or %l7, %lo(sys_ni_syscall), %l7 155 156linux_syscall_trace32: 157 call syscall_trace_enter 158 add %sp, PTREGS_OFF, %o0 159 brnz,pn %o0, 3f 160 mov -ENOSYS, %o0 161 srl %i0, 0, %o0 162 srl %i4, 0, %o4 163 srl %i1, 0, %o1 164 srl %i2, 0, %o2 165 ba,pt %xcc, 5f 166 srl %i3, 0, %o3 167 168linux_syscall_trace: 169 call syscall_trace_enter 170 add %sp, PTREGS_OFF, %o0 171 brnz,pn %o0, 3f 172 mov -ENOSYS, %o0 173 mov %i0, %o0 174 mov %i1, %o1 175 mov %i2, %o2 176 mov %i3, %o3 177 b,pt %xcc, 2f 178 mov %i4, %o4 179 180 181 /* Linux 32-bit system calls enter here... */ 182 .align 32 183 .globl linux_sparc_syscall32 184linux_sparc_syscall32: 185 /* Direct access to user regs, much faster. */ 186 cmp %g1, NR_syscalls ! IEU1 Group 187 bgeu,pn %xcc, linux_sparc_ni_syscall ! CTI 188 srl %i0, 0, %o0 ! IEU0 189 sll %g1, 2, %l4 ! IEU0 Group 190 srl %i4, 0, %o4 ! IEU1 191 lduw [%l7 + %l4], %l7 ! Load 192 srl %i1, 0, %o1 ! IEU0 Group 193 ldx [%g6 + TI_FLAGS], %l0 ! Load 194 195 srl %i3, 0, %o3 ! IEU0 196 srl %i2, 0, %o2 ! IEU0 Group 197 andcc %l0, (_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT|_TIF_SYSCALL_TRACEPOINT|_TIF_NOHZ), %g0 198 bne,pn %icc, linux_syscall_trace32 ! CTI 199 mov %i0, %l5 ! IEU1 2005: call %l7 ! CTI Group brk forced 201 srl %i5, 0, %o5 ! IEU1 202 ba,pt %xcc, 3f 203 sra %o0, 0, %o0 204 205 /* Linux native system calls enter here... */ 206 .align 32 207 .globl linux_sparc_syscall 208linux_sparc_syscall: 209 /* Direct access to user regs, much faster. */ 210 cmp %g1, NR_syscalls ! IEU1 Group 211 bgeu,pn %xcc, linux_sparc_ni_syscall ! CTI 212 mov %i0, %o0 ! IEU0 213 sll %g1, 2, %l4 ! IEU0 Group 214 mov %i1, %o1 ! IEU1 215 lduw [%l7 + %l4], %l7 ! Load 2164: mov %i2, %o2 ! IEU0 Group 217 ldx [%g6 + TI_FLAGS], %l0 ! Load 218 219 mov %i3, %o3 ! IEU1 220 mov %i4, %o4 ! IEU0 Group 221 andcc %l0, (_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT|_TIF_SYSCALL_TRACEPOINT|_TIF_NOHZ), %g0 222 bne,pn %icc, linux_syscall_trace ! CTI Group 223 mov %i0, %l5 ! IEU0 2242: call %l7 ! CTI Group brk forced 225 mov %i5, %o5 ! IEU0 226 nop 227 2283: stx %o0, [%sp + PTREGS_OFF + PT_V9_I0] 229ret_sys_call: 230 ldx [%sp + PTREGS_OFF + PT_V9_TSTATE], %g3 231 mov %ulo(TSTATE_XCARRY | TSTATE_ICARRY), %g2 232 sllx %g2, 32, %g2 233 234 cmp %o0, -ERESTART_RESTARTBLOCK 235 bgeu,pn %xcc, 1f 236 andcc %l0, (_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT|_TIF_SYSCALL_TRACEPOINT|_TIF_NOHZ), %g0 237 ldx [%sp + PTREGS_OFF + PT_V9_TNPC], %l1 ! pc = npc 238 2392: 240 /* System call success, clear Carry condition code. */ 241 andn %g3, %g2, %g3 2423: 243 stx %g3, [%sp + PTREGS_OFF + PT_V9_TSTATE] 244 bne,pn %icc, linux_syscall_trace2 245 add %l1, 0x4, %l2 ! npc = npc+4 246 stx %l1, [%sp + PTREGS_OFF + PT_V9_TPC] 247 ba,pt %xcc, rtrap 248 stx %l2, [%sp + PTREGS_OFF + PT_V9_TNPC] 249 2501: 251 /* Check if force_successful_syscall_return() 252 * was invoked. 253 */ 254 ldub [%g6 + TI_SYS_NOERROR], %l2 255 brnz,pn %l2, 2b 256 ldx [%sp + PTREGS_OFF + PT_V9_TNPC], %l1 ! pc = npc 257 /* System call failure, set Carry condition code. 258 * Also, get abs(errno) to return to the process. 259 */ 260 sub %g0, %o0, %o0 261 stx %o0, [%sp + PTREGS_OFF + PT_V9_I0] 262 ba,pt %xcc, 3b 263 or %g3, %g2, %g3 264 265linux_syscall_trace2: 266 call syscall_trace_leave 267 add %sp, PTREGS_OFF, %o0 268 stx %l1, [%sp + PTREGS_OFF + PT_V9_TPC] 269 ba,pt %xcc, rtrap 270 stx %l2, [%sp + PTREGS_OFF + PT_V9_TNPC] 271