linux/arch/sparc/kernel/syscalls.S
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   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,a,pt %xcc, 3f
 193
 194        /* Linux native system calls enter here... */
 195        .align  32
 196        .globl  linux_sparc_syscall
 197linux_sparc_syscall:
 198        /* Direct access to user regs, much faster. */
 199        cmp     %g1, NR_syscalls                        ! IEU1  Group
 200        bgeu,pn %xcc, linux_sparc_ni_syscall            ! CTI
 201         mov    %i0, %o0                                ! IEU0
 202        sll     %g1, 2, %l4                             ! IEU0  Group
 203        mov     %i1, %o1                                ! IEU1
 204        lduw    [%l7 + %l4], %l7                        ! Load
 2054:      mov     %i2, %o2                                ! IEU0  Group
 206        ldx     [%g6 + TI_FLAGS], %l0           ! Load
 207
 208        mov     %i3, %o3                                ! IEU1
 209        mov     %i4, %o4                                ! IEU0  Group
 210        andcc   %l0, (_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT|_TIF_SYSCALL_TRACEPOINT|_TIF_NOHZ), %g0
 211        bne,pn  %icc, linux_syscall_trace               ! CTI   Group
 212         mov    %i0, %l5                                ! IEU0
 2132:      call    %l7                                     ! CTI   Group brk forced
 214         mov    %i5, %o5                                ! IEU0
 215        nop
 216
 2173:      stx     %o0, [%sp + PTREGS_OFF + PT_V9_I0]
 218ret_sys_call:
 219        ldx     [%sp + PTREGS_OFF + PT_V9_TSTATE], %g3
 220        sra     %o0, 0, %o0
 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
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