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_group 122 .type sparc_exit_group,#function 123sparc_exit_group: 124 sethi %hi(sys_exit_group), %g7 125 ba,pt %xcc, 1f 126 or %g7, %lo(sys_exit_group), %g7 127 .size sparc_exit_group,.-sparc_exit_group 128 129 .globl sparc_exit 130 .type sparc_exit,#function 131sparc_exit: 132 sethi %hi(sys_exit), %g7 133 or %g7, %lo(sys_exit), %g7 1341: rdpr %pstate, %g2 135 wrpr %g2, PSTATE_IE, %pstate 136 rdpr %otherwin, %g1 137 rdpr %cansave, %g3 138 add %g3, %g1, %g3 139 wrpr %g3, 0x0, %cansave 140 wrpr %g0, 0x0, %otherwin 141 wrpr %g2, 0x0, %pstate 142 jmpl %g7, %g0 143 stb %g0, [%g6 + TI_WSAVED] 144 .size sparc_exit,.-sparc_exit 145 146linux_sparc_ni_syscall: 147 sethi %hi(sys_ni_syscall), %l7 148 ba,pt %xcc, 4f 149 or %l7, %lo(sys_ni_syscall), %l7 150 151linux_syscall_trace32: 152 call syscall_trace_enter 153 add %sp, PTREGS_OFF, %o0 154 brnz,pn %o0, 3f 155 mov -ENOSYS, %o0 156 srl %i0, 0, %o0 157 srl %i4, 0, %o4 158 srl %i1, 0, %o1 159 srl %i2, 0, %o2 160 ba,pt %xcc, 2f 161 srl %i3, 0, %o3 162 163linux_syscall_trace: 164 call syscall_trace_enter 165 add %sp, PTREGS_OFF, %o0 166 brnz,pn %o0, 3f 167 mov -ENOSYS, %o0 168 mov %i0, %o0 169 mov %i1, %o1 170 mov %i2, %o2 171 mov %i3, %o3 172 b,pt %xcc, 2f 173 mov %i4, %o4 174 175 176 /* Linux 32-bit system calls enter here... */ 177 .align 32 178 .globl linux_sparc_syscall32 179linux_sparc_syscall32: 180 /* Direct access to user regs, much faster. */ 181 cmp %g1, NR_syscalls ! IEU1 Group 182 bgeu,pn %xcc, linux_sparc_ni_syscall ! CTI 183 srl %i0, 0, %o0 ! IEU0 184 sll %g1, 2, %l4 ! IEU0 Group 185 srl %i4, 0, %o4 ! IEU1 186 lduw [%l7 + %l4], %l7 ! Load 187 srl %i1, 0, %o1 ! IEU0 Group 188 ldx [%g6 + TI_FLAGS], %l0 ! Load 189 190 srl %i5, 0, %o5 ! IEU1 191 srl %i2, 0, %o2 ! IEU0 Group 192 andcc %l0, (_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT|_TIF_SYSCALL_TRACEPOINT), %g0 193 bne,pn %icc, linux_syscall_trace32 ! CTI 194 mov %i0, %l5 ! IEU1 195 call %l7 ! CTI Group brk forced 196 srl %i3, 0, %o3 ! IEU0 197 ba,a,pt %xcc, 3f 198 199 /* Linux native system calls enter here... */ 200 .align 32 201 .globl linux_sparc_syscall 202linux_sparc_syscall: 203 /* Direct access to user regs, much faster. */ 204 cmp %g1, NR_syscalls ! IEU1 Group 205 bgeu,pn %xcc, linux_sparc_ni_syscall ! CTI 206 mov %i0, %o0 ! IEU0 207 sll %g1, 2, %l4 ! IEU0 Group 208 mov %i1, %o1 ! IEU1 209 lduw [%l7 + %l4], %l7 ! Load 2104: mov %i2, %o2 ! IEU0 Group 211 ldx [%g6 + TI_FLAGS], %l0 ! Load 212 213 mov %i3, %o3 ! IEU1 214 mov %i4, %o4 ! IEU0 Group 215 andcc %l0, (_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT|_TIF_SYSCALL_TRACEPOINT), %g0 216 bne,pn %icc, linux_syscall_trace ! CTI Group 217 mov %i0, %l5 ! IEU0 2182: call %l7 ! CTI Group brk forced 219 mov %i5, %o5 ! IEU0 220 nop 221 2223: stx %o0, [%sp + PTREGS_OFF + PT_V9_I0] 223ret_sys_call: 224 ldx [%sp + PTREGS_OFF + PT_V9_TSTATE], %g3 225 sra %o0, 0, %o0 226 mov %ulo(TSTATE_XCARRY | TSTATE_ICARRY), %g2 227 sllx %g2, 32, %g2 228 229 cmp %o0, -ERESTART_RESTARTBLOCK 230 bgeu,pn %xcc, 1f 231 andcc %l0, (_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT|_TIF_SYSCALL_TRACEPOINT), %g0 232 ldx [%sp + PTREGS_OFF + PT_V9_TNPC], %l1 ! pc = npc 233 2342: 235 stb %g0, [%g6 + TI_SYS_NOERROR] 236 /* System call success, clear Carry condition code. */ 237 andn %g3, %g2, %g3 2383: 239 stx %g3, [%sp + PTREGS_OFF + PT_V9_TSTATE] 240 bne,pn %icc, linux_syscall_trace2 241 add %l1, 0x4, %l2 ! npc = npc+4 242 stx %l1, [%sp + PTREGS_OFF + PT_V9_TPC] 243 ba,pt %xcc, rtrap 244 stx %l2, [%sp + PTREGS_OFF + PT_V9_TNPC] 245 2461: 247 /* Check if force_successful_syscall_return() 248 * was invoked. 249 */ 250 ldub [%g6 + TI_SYS_NOERROR], %l2 251 brnz,pn %l2, 2b 252 ldx [%sp + PTREGS_OFF + PT_V9_TNPC], %l1 ! pc = npc 253 /* System call failure, set Carry condition code. 254 * Also, get abs(errno) to return to the process. 255 */ 256 sub %g0, %o0, %o0 257 stx %o0, [%sp + PTREGS_OFF + PT_V9_I0] 258 ba,pt %xcc, 3b 259 or %g3, %g2, %g3 260 261linux_syscall_trace2: 262 call syscall_trace_leave 263 add %sp, PTREGS_OFF, %o0 264 stx %l1, [%sp + PTREGS_OFF + PT_V9_TPC] 265 ba,pt %xcc, rtrap 266 stx %l2, [%sp + PTREGS_OFF + PT_V9_TNPC] 267