arch/sparc/kernel/syscalls.S

   1         /* SunOS's execv() call only specifies the argv argument, the
   2          * environment settings are the same as the calling processes.
   3          */
   4 sys64_execve:
   5         set     sys_execve, %g1
   6         jmpl    %g1, %g0
   7          flushw
   8
   9 #ifdef CONFIG_COMPAT
  10 sunos_execv:
  11         mov     %g0, %o2
  12 sys32_execve:
  13         set     compat_sys_execve, %g1
  14         jmpl    %g1, %g0
  15          flushw
  16 #endif
  17
  18         .align  32
  19 sys_sparc_pipe:
  20         ba,pt   %xcc, sys_sparc_pipe_real
  21          add    %sp, PTREGS_OFF, %o0
  22 sys_nis_syscall:
  23         ba,pt   %xcc, c_sys_nis_syscall
  24          add    %sp, PTREGS_OFF, %o0
  25 sys_memory_ordering:
  26         ba,pt   %xcc, sparc_memory_ordering
  27          add    %sp, PTREGS_OFF, %o1
  28 sys_sigaltstack:
  29         ba,pt   %xcc, do_sigaltstack
  30          add    %i6, STACK_BIAS, %o2
  31 #ifdef CONFIG_COMPAT
  32 sys32_sigstack:
  33         ba,pt   %xcc, do_sys32_sigstack
  34          mov    %i6, %o2
  35 sys32_sigaltstack:
  36         ba,pt   %xcc, do_sys32_sigaltstack
  37          mov    %i6, %o2
  38 #endif
  39         .align  32
  40 #ifdef CONFIG_COMPAT
  41 sys32_sigreturn:
  42         add     %sp, PTREGS_OFF, %o0
  43         call    do_sigreturn32
  44          add    %o7, 1f-.-4, %o7
  45         nop
  46 #endif
  47 sys_rt_sigreturn:
  48         add     %sp, PTREGS_OFF, %o0
  49         call    do_rt_sigreturn
  50          add    %o7, 1f-.-4, %o7
  51         nop
  52 #ifdef CONFIG_COMPAT
  53 sys32_rt_sigreturn:
  54         add     %sp, PTREGS_OFF, %o0
  55         call    do_rt_sigreturn32
  56          add    %o7, 1f-.-4, %o7
  57         nop
  58 #endif
  59         .align  32
  60 1:      ldx     [%g6 + TI_FLAGS], %l5
  61         andcc   %l5, (_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT|_TIF_SYSCALL_TRACEPOINT), %g0
  62         be,pt   %icc, rtrap
  63          nop
  64         call    syscall_trace_leave
  65          add    %sp, PTREGS_OFF, %o0
  66         ba,pt   %xcc, rtrap
  67          nop
  68
  69         /* This is how fork() was meant to be done, 8 instruction entry.
  70          *
  71          * I questioned the following code briefly, let me clear things
  72          * up so you must not reason on it like I did.
  73          *
  74          * Know the fork_kpsr etc. we use in the sparc32 port?  We don't
  75          * need it here because the only piece of window state we copy to
  76          * the child is the CWP register.  Even if the parent sleeps,
  77          * we are safe because we stuck it into pt_regs of the parent
  78          * so it will not change.
  79          *
  80          * XXX This raises the question, whether we can do the same on
  81          * XXX sparc32 to get rid of fork_kpsr _and_ fork_kwim.  The
  82          * XXX answer is yes.  We stick fork_kpsr in UREG_G0 and
  83          * XXX fork_kwim in UREG_G1 (global registers are considered
  84          * XXX volatile across a system call in the sparc ABI I think
  85          * XXX if it isn't we can use regs->y instead, anyone who depends
  86          * XXX upon the Y register being preserved across a fork deserves
  87          * XXX to lose).
  88          *
  89          * In fact we should take advantage of that fact for other things
  90          * during system calls...
  91          */
  92         .align  32
  93 sys_vfork: /* Under Linux, vfork and fork are just special cases of clone. */
  94         sethi   %hi(0x4000 | 0x0100 | SIGCHLD), %o0
  95         or      %o0, %lo(0x4000 | 0x0100 | SIGCHLD), %o0
  96         ba,pt   %xcc, sys_clone
  97 sys_fork:
  98          clr    %o1
  99         mov     SIGCHLD, %o0
 100 sys_clone:
 101         flushw
 102         movrz   %o1, %fp, %o1
 103         mov     0, %o3
 104         ba,pt   %xcc, sparc_do_fork
 105          add    %sp, PTREGS_OFF, %o2
 106
 107         .globl  ret_from_syscall
 108 ret_from_syscall:
 109         /* Clear current_thread_info()->new_child. */
 110         stb     %g0, [%g6 + TI_NEW_CHILD]
 111         call    schedule_tail
 112          mov    %g7, %o0
 113         ldx     [%sp + PTREGS_OFF + PT_V9_I0], %o0
 114         brnz,pt %o0, ret_sys_call
 115          ldx    [%g6 + TI_FLAGS], %l0
 116         ldx     [%sp + PTREGS_OFF + PT_V9_G1], %l1
 117         call    %l1
 118          ldx    [%sp + PTREGS_OFF + PT_V9_G2], %o0
 119         ba,pt   %xcc, ret_sys_call
 120          mov    0, %o0
 121
 122         .globl  sparc_exit_group
 123         .type   sparc_exit_group,#function
 124 sparc_exit_group:
 125         sethi   %hi(sys_exit_group), %g7
 126         ba,pt   %xcc, 1f
 127          or     %g7, %lo(sys_exit_group), %g7
 128         .size   sparc_exit_group,.-sparc_exit_group
 129
 130         .globl  sparc_exit
 131         .type   sparc_exit,#function
 132 sparc_exit:
 133         sethi   %hi(sys_exit), %g7
 134         or      %g7, %lo(sys_exit), %g7
 135 1:      rdpr    %pstate, %g2
 136         wrpr    %g2, PSTATE_IE, %pstate
 137         rdpr    %otherwin, %g1
 138         rdpr    %cansave, %g3
 139         add     %g3, %g1, %g3
 140         wrpr    %g3, 0x0, %cansave
 141         wrpr    %g0, 0x0, %otherwin
 142         wrpr    %g2, 0x0, %pstate
 143         jmpl    %g7, %g0
 144          stb    %g0, [%g6 + TI_WSAVED]
 145         .size   sparc_exit,.-sparc_exit
 146
 147 linux_sparc_ni_syscall:
 148         sethi   %hi(sys_ni_syscall), %l7
 149         ba,pt   %xcc, 4f
 150          or     %l7, %lo(sys_ni_syscall), %l7
 151
 152 linux_syscall_trace32:
 153         call    syscall_trace_enter
 154          add    %sp, PTREGS_OFF, %o0
 155         brnz,pn %o0, 3f
 156          mov    -ENOSYS, %o0
 157         srl     %i0, 0, %o0
 158         srl     %i4, 0, %o4
 159         srl     %i1, 0, %o1
 160         srl     %i2, 0, %o2
 161         ba,pt   %xcc, 2f
 162          srl    %i3, 0, %o3
 163
 164 linux_syscall_trace:
 165         call    syscall_trace_enter
 166          add    %sp, PTREGS_OFF, %o0
 167         brnz,pn %o0, 3f
 168          mov    -ENOSYS, %o0
 169         mov     %i0, %o0
 170         mov     %i1, %o1
 171         mov     %i2, %o2
 172         mov     %i3, %o3
 173         b,pt    %xcc, 2f
 174          mov    %i4, %o4
 175
 176
 177         /* Linux 32-bit system calls enter here... */
 178         .align  32
 179         .globl  linux_sparc_syscall32
 180 linux_sparc_syscall32:
 181         /* Direct access to user regs, much faster. */
 182         cmp     %g1, NR_syscalls                        ! IEU1  Group
 183         bgeu,pn %xcc, linux_sparc_ni_syscall            ! CTI
 184          srl    %i0, 0, %o0                             ! IEU0
 185         sll     %g1, 2, %l4                             ! IEU0  Group
 186         srl     %i4, 0, %o4                             ! IEU1
 187         lduw    [%l7 + %l4], %l7                        ! Load
 188         srl     %i1, 0, %o1                             ! IEU0  Group
 189         ldx     [%g6 + TI_FLAGS], %l0           ! Load
 190
 191         srl     %i5, 0, %o5                             ! IEU1
 192         srl     %i2, 0, %o2                             ! IEU0  Group
 193         andcc   %l0, (_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT|_TIF_SYSCALL_TRACEPOINT), %g0
 194         bne,pn  %icc, linux_syscall_trace32             ! CTI
 195          mov    %i0, %l5                                ! IEU1
 196         call    %l7                                     ! CTI   Group brk forced
 197          srl    %i3, 0, %o3                             ! IEU0
 198         ba,a,pt %xcc, 3f
 199
 200         /* Linux native system calls enter here... */
 201         .align  32
 202         .globl  linux_sparc_syscall
 203 linux_sparc_syscall:
 204         /* Direct access to user regs, much faster. */
 205         cmp     %g1, NR_syscalls                        ! IEU1  Group
 206         bgeu,pn %xcc, linux_sparc_ni_syscall            ! CTI
 207          mov    %i0, %o0                                ! IEU0
 208         sll     %g1, 2, %l4                             ! IEU0  Group
 209         mov     %i1, %o1                                ! IEU1
 210         lduw    [%l7 + %l4], %l7                        ! Load
 211 4:      mov     %i2, %o2                                ! IEU0  Group
 212         ldx     [%g6 + TI_FLAGS], %l0           ! Load
 213
 214         mov     %i3, %o3                                ! IEU1
 215         mov     %i4, %o4                                ! IEU0  Group
 216         andcc   %l0, (_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT|_TIF_SYSCALL_TRACEPOINT), %g0
 217         bne,pn  %icc, linux_syscall_trace               ! CTI   Group
 218          mov    %i0, %l5                                ! IEU0
 219 2:      call    %l7                                     ! CTI   Group brk forced
 220          mov    %i5, %o5                                ! IEU0
 221         nop
 222
 223 3:      stx     %o0, [%sp + PTREGS_OFF + PT_V9_I0]
 224 ret_sys_call:
 225         ldx     [%sp + PTREGS_OFF + PT_V9_TSTATE], %g3
 226         sra     %o0, 0, %o0
 227         mov     %ulo(TSTATE_XCARRY | TSTATE_ICARRY), %g2
 228         sllx    %g2, 32, %g2
 229
 230         cmp     %o0, -ERESTART_RESTARTBLOCK
 231         bgeu,pn %xcc, 1f
 232          andcc  %l0, (_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT|_TIF_SYSCALL_TRACEPOINT), %g0
 233         ldx     [%sp + PTREGS_OFF + PT_V9_TNPC], %l1 ! pc = npc
 234
 235 2:
 236         /* System call success, clear Carry condition code. */
 237         andn    %g3, %g2, %g3
 238 3:
 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
 246 1:
 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
 261 linux_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]