1 /* SunOS's execv() call only specifies the argv argument, the 2 * environment settings are the same as the calling processes. 3 */ 4sys_execve: 5 sethi %hi(sparc_execve), %g1 6 ba,pt %xcc, execve_merge 7 or %g1, %lo(sparc_execve), %g1 8 9#ifdef CONFIG_COMPAT 10sunos_execv: 11 stx %g0, [%sp + PTREGS_OFF + PT_V9_I2] 12sys32_execve: 13 sethi %hi(sparc32_execve), %g1 14 or %g1, %lo(sparc32_execve), %g1 15#endif 16 17execve_merge: 18 flushw 19 jmpl %g1, %g0 20 add %sp, PTREGS_OFF, %o0 21 22 .align 32 23sys_sparc_pipe: 24 ba,pt %xcc, sys_sparc_pipe_real 25 add %sp, PTREGS_OFF, %o0 26sys_nis_syscall: 27 ba,pt %xcc, c_sys_nis_syscall 28 add %sp, PTREGS_OFF, %o0 29sys_memory_ordering: 30 ba,pt %xcc, sparc_memory_ordering 31 add %sp, PTREGS_OFF, %o1 32sys_sigaltstack: 33 ba,pt %xcc, do_sigaltstack 34 add %i6, STACK_BIAS, %o2 35#ifdef CONFIG_COMPAT 36sys32_sigstack: 37 ba,pt %xcc, do_sys32_sigstack 38 mov %i6, %o2 39sys32_sigaltstack: 40 ba,pt %xcc, do_sys32_sigaltstack 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), %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_syscall 112ret_from_syscall: 113 /* Clear current_thread_info()->new_child. */ 114 stb %g0, [%g6 + TI_NEW_CHILD] 115 ldx [%g6 + TI_FLAGS], %l0 116 call schedule_tail 117 mov %g7, %o0 118 ba,pt %xcc, ret_sys_call 119 ldx [%sp + PTREGS_OFF + PT_V9_I0], %o0 120 121 .globl sparc_exit 122 .type sparc_exit,#function 123sparc_exit: 124 rdpr %pstate, %g2 125 wrpr %g2, PSTATE_IE, %pstate 126 rdpr %otherwin, %g1 127 rdpr %cansave, %g3 128 add %g3, %g1, %g3 129 wrpr %g3, 0x0, %cansave 130 wrpr %g0, 0x0, %otherwin 131 wrpr %g2, 0x0, %pstate 132 ba,pt %xcc, sys_exit 133 stb %g0, [%g6 + TI_WSAVED] 134 .size sparc_exit,.-sparc_exit 135 136linux_sparc_ni_syscall: 137 sethi %hi(sys_ni_syscall), %l7 138 ba,pt %xcc, 4f 139 or %l7, %lo(sys_ni_syscall), %l7 140 141linux_syscall_trace32: 142 call syscall_trace_enter 143 add %sp, PTREGS_OFF, %o0 144 brnz,pn %o0, 3f 145 mov -ENOSYS, %o0 146 srl %i0, 0, %o0 147 srl %i4, 0, %o4 148 srl %i1, 0, %o1 149 srl %i2, 0, %o2 150 ba,pt %xcc, 2f 151 srl %i3, 0, %o3 152 153linux_syscall_trace: 154 call syscall_trace_enter 155 add %sp, PTREGS_OFF, %o0 156 brnz,pn %o0, 3f 157 mov -ENOSYS, %o0 158 mov %i0, %o0 159 mov %i1, %o1 160 mov %i2, %o2 161 mov %i3, %o3 162 b,pt %xcc, 2f 163 mov %i4, %o4 164 165 166 /* Linux 32-bit system calls enter here... */ 167 .align 32 168 .globl linux_sparc_syscall32 169linux_sparc_syscall32: 170 /* Direct access to user regs, much faster. */ 171 cmp %g1, NR_syscalls ! IEU1 Group 172 bgeu,pn %xcc, linux_sparc_ni_syscall ! CTI 173 srl %i0, 0, %o0 ! IEU0 174 sll %g1, 2, %l4 ! IEU0 Group 175 srl %i4, 0, %o4 ! IEU1 176 lduw [%l7 + %l4], %l7 ! Load 177 srl %i1, 0, %o1 ! IEU0 Group 178 ldx [%g6 + TI_FLAGS], %l0 ! Load 179 180 srl %i5, 0, %o5 ! IEU1 181 srl %i2, 0, %o2 ! IEU0 Group 182 andcc %l0, (_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT|_TIF_SYSCALL_TRACEPOINT), %g0 183 bne,pn %icc, linux_syscall_trace32 ! CTI 184 mov %i0, %l5 ! IEU1 185 call %l7 ! CTI Group brk forced 186 srl %i3, 0, %o3 ! IEU0 187 ba,a,pt %xcc, 3f 188 189 /* Linux native system calls enter here... */ 190 .align 32 191 .globl linux_sparc_syscall 192linux_sparc_syscall: 193 /* Direct access to user regs, much faster. */ 194 cmp %g1, NR_syscalls ! IEU1 Group 195 bgeu,pn %xcc, linux_sparc_ni_syscall ! CTI 196 mov %i0, %o0 ! IEU0 197 sll %g1, 2, %l4 ! IEU0 Group 198 mov %i1, %o1 ! IEU1 199 lduw [%l7 + %l4], %l7 ! Load 2004: mov %i2, %o2 ! IEU0 Group 201 ldx [%g6 + TI_FLAGS], %l0 ! Load 202 203 mov %i3, %o3 ! IEU1 204 mov %i4, %o4 ! IEU0 Group 205 andcc %l0, (_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT|_TIF_SYSCALL_TRACEPOINT), %g0 206 bne,pn %icc, linux_syscall_trace ! CTI Group 207 mov %i0, %l5 ! IEU0 2082: call %l7 ! CTI Group brk forced 209 mov %i5, %o5 ! IEU0 210 nop 211 2123: stx %o0, [%sp + PTREGS_OFF + PT_V9_I0] 213ret_sys_call: 214 ldx [%sp + PTREGS_OFF + PT_V9_TSTATE], %g3 215 ldx [%sp + PTREGS_OFF + PT_V9_TNPC], %l1 ! pc = npc 216 sra %o0, 0, %o0 217 mov %ulo(TSTATE_XCARRY | TSTATE_ICARRY), %g2 218 sllx %g2, 32, %g2 219 220 /* Check if force_successful_syscall_return() 221 * was invoked. 222 */ 223 ldub [%g6 + TI_SYS_NOERROR], %l2 224 brnz,a,pn %l2, 80f 225 stb %g0, [%g6 + TI_SYS_NOERROR] 226 227 cmp %o0, -ERESTART_RESTARTBLOCK 228 bgeu,pn %xcc, 1f 229 andcc %l0, (_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT|_TIF_SYSCALL_TRACEPOINT), %l6 23080: 231 /* System call success, clear Carry condition code. */ 232 andn %g3, %g2, %g3 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 /* System call failure, set Carry condition code. 242 * Also, get abs(errno) to return to the process. 243 */ 244 andcc %l0, (_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT|_TIF_SYSCALL_TRACEPOINT), %l6 245 sub %g0, %o0, %o0 246 or %g3, %g2, %g3 247 stx %o0, [%sp + PTREGS_OFF + PT_V9_I0] 248 stx %g3, [%sp + PTREGS_OFF + PT_V9_TSTATE] 249 bne,pn %icc, linux_syscall_trace2 250 add %l1, 0x4, %l2 ! npc = npc+4 251 stx %l1, [%sp + PTREGS_OFF + PT_V9_TPC] 252 253 b,pt %xcc, rtrap 254 stx %l2, [%sp + PTREGS_OFF + PT_V9_TNPC] 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