LXR linux/arch/sparc/kernel/syscalls.S

   1/* SPDX-License-Identifier: GPL-2.0 */
   2        /* SunOS's execv() call only specifies the argv argument, the
   3         * environment settings are the same as the calling processes.
   4         */
   5sys64_execve:
   6        set     sys_execve, %g1
   7        jmpl    %g1, %g0
   8         flushw
   9
  10sys64_execveat:
  11        set     sys_execveat, %g1
  12        jmpl    %g1, %g0
  13         flushw
  14
  15#ifdef CONFIG_COMPAT
  16sunos_execv:
  17        mov     %g0, %o2
  18sys32_execve:
  19        set     compat_sys_execve, %g1
  20        jmpl    %g1, %g0
  21         flushw
  22
  23sys32_execveat:
  24        set     compat_sys_execveat, %g1
  25        jmpl    %g1, %g0
  26         flushw
  27#endif
  28
  29        .align  32
  30#ifdef CONFIG_COMPAT
  31sys32_sigstack:
  32        ba,pt   %xcc, do_sys32_sigstack
  33         mov    %i6, %o2
  34#endif
  35        .align  32
  36#ifdef CONFIG_COMPAT
  37sys32_sigreturn:
  38        add     %sp, PTREGS_OFF, %o0
  39        call    do_sigreturn32
  40         add    %o7, 1f-.-4, %o7
  41        nop
  42#endif
  43sys_rt_sigreturn:
  44        add     %sp, PTREGS_OFF, %o0
  45        call    do_rt_sigreturn
  46         add    %o7, 1f-.-4, %o7
  47        nop
  48#ifdef CONFIG_COMPAT
  49sys32_rt_sigreturn:
  50        add     %sp, PTREGS_OFF, %o0
  51        call    do_rt_sigreturn32
  52         add    %o7, 1f-.-4, %o7
  53        nop
  54#endif
  55        .align  32
  561:      ldx     [%g6 + TI_FLAGS], %l5
  57        andcc   %l5, (_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT|_TIF_SYSCALL_TRACEPOINT|_TIF_NOHZ), %g0
  58        be,pt   %icc, rtrap
  59         nop
  60        call    syscall_trace_leave
  61         add    %sp, PTREGS_OFF, %o0
  62        ba,pt   %xcc, rtrap
  63         nop
  64
  65        /* This is how fork() was meant to be done, 8 instruction entry.
  66         *
  67         * I questioned the following code briefly, let me clear things
  68         * up so you must not reason on it like I did.
  69         *
  70         * Know the fork_kpsr etc. we use in the sparc32 port?  We don't
  71         * need it here because the only piece of window state we copy to
  72         * the child is the CWP register.  Even if the parent sleeps,
  73         * we are safe because we stuck it into pt_regs of the parent
  74         * so it will not change.
  75         *
  76         * XXX This raises the question, whether we can do the same on
  77         * XXX sparc32 to get rid of fork_kpsr _and_ fork_kwim.  The
  78         * XXX answer is yes.  We stick fork_kpsr in UREG_G0 and
  79         * XXX fork_kwim in UREG_G1 (global registers are considered
  80         * XXX volatile across a system call in the sparc ABI I think
  81         * XXX if it isn't we can use regs->y instead, anyone who depends
  82         * XXX upon the Y register being preserved across a fork deserves
  83         * XXX to lose).
  84         *
  85         * In fact we should take advantage of that fact for other things
  86         * during system calls...
  87         */
  88        .align  32
  89sys_vfork:
  90        flushw
  91        ba,pt   %xcc, sparc_vfork
  92         add    %sp, PTREGS_OFF, %o0
  93
  94        .align  32
  95sys_fork:
  96        flushw
  97        ba,pt   %xcc, sparc_fork
  98         add    %sp, PTREGS_OFF, %o0
  99
 100        .align  32
 101sys_clone:
 102        flushw
 103        ba,pt   %xcc, sparc_clone
 104         add    %sp, PTREGS_OFF, %o0
 105
 106        .globl  ret_from_fork
 107ret_from_fork:
 108        /* Clear current_thread_info()->new_child. */
 109        stb     %g0, [%g6 + TI_NEW_CHILD]
 110        call    schedule_tail
 111         mov    %g7, %o0
 112        ldx     [%sp + PTREGS_OFF + PT_V9_I0], %o0
 113        brnz,pt %o0, ret_sys_call
 114         ldx    [%g6 + TI_FLAGS], %l0
 115        ldx     [%sp + PTREGS_OFF + PT_V9_G1], %l1
 116        call    %l1
 117         ldx    [%sp + PTREGS_OFF + PT_V9_G2], %o0
 118        ba,pt   %xcc, ret_sys_call
 119         mov    0, %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
 157        /* Syscall tracing can modify the registers.  */
 158        ldx     [%sp + PTREGS_OFF + PT_V9_G1], %g1
 159        sethi   %hi(sys_call_table32), %l7
 160        ldx     [%sp + PTREGS_OFF + PT_V9_I0], %i0
 161        or      %l7, %lo(sys_call_table32), %l7
 162        ldx     [%sp + PTREGS_OFF + PT_V9_I1], %i1
 163        ldx     [%sp + PTREGS_OFF + PT_V9_I2], %i2
 164        ldx     [%sp + PTREGS_OFF + PT_V9_I3], %i3
 165        ldx     [%sp + PTREGS_OFF + PT_V9_I4], %i4
 166        ldx     [%sp + PTREGS_OFF + PT_V9_I5], %i5
 167
 168        cmp     %g1, NR_syscalls
 169        bgeu,pn %xcc, 3f
 170         mov    -ENOSYS, %o0
 171
 172        sll     %g1, 2, %l4
 173        srl     %i0, 0, %o0
 174        lduw    [%l7 + %l4], %l7
 175        srl     %i4, 0, %o4
 176        srl     %i1, 0, %o1
 177        srl     %i2, 0, %o2
 178        ba,pt   %xcc, 5f
 179         srl    %i3, 0, %o3
 180
 181linux_syscall_trace:
 182        call    syscall_trace_enter
 183         add    %sp, PTREGS_OFF, %o0
 184        brnz,pn %o0, 3f
 185         mov    -ENOSYS, %o0
 186
 187        /* Syscall tracing can modify the registers.  */
 188        ldx     [%sp + PTREGS_OFF + PT_V9_G1], %g1
 189        sethi   %hi(sys_call_table64), %l7
 190        ldx     [%sp + PTREGS_OFF + PT_V9_I0], %i0
 191        or      %l7, %lo(sys_call_table64), %l7
 192        ldx     [%sp + PTREGS_OFF + PT_V9_I1], %i1
 193        ldx     [%sp + PTREGS_OFF + PT_V9_I2], %i2
 194        ldx     [%sp + PTREGS_OFF + PT_V9_I3], %i3
 195        ldx     [%sp + PTREGS_OFF + PT_V9_I4], %i4
 196        ldx     [%sp + PTREGS_OFF + PT_V9_I5], %i5
 197
 198        cmp     %g1, NR_syscalls
 199        bgeu,pn %xcc, 3f
 200         mov    -ENOSYS, %o0
 201
 202        sll     %g1, 2, %l4
 203        mov     %i0, %o0
 204        lduw    [%l7 + %l4], %l7
 205        mov     %i1, %o1
 206        mov     %i2, %o2
 207        mov     %i3, %o3
 208        b,pt    %xcc, 2f
 209         mov    %i4, %o4
 210
 211
 212        /* Linux 32-bit system calls enter here... */
 213        .align  32
 214        .globl  linux_sparc_syscall32
 215linux_sparc_syscall32:
 216        /* Direct access to user regs, much faster. */
 217        cmp     %g1, NR_syscalls                        ! IEU1  Group
 218        bgeu,pn %xcc, linux_sparc_ni_syscall            ! CTI
 219         srl    %i0, 0, %o0                             ! IEU0
 220        sll     %g1, 2, %l4                             ! IEU0  Group
 221        srl     %i4, 0, %o4                             ! IEU1
 222        lduw    [%l7 + %l4], %l7                        ! Load
 223        srl     %i1, 0, %o1                             ! IEU0  Group
 224        ldx     [%g6 + TI_FLAGS], %l0           ! Load
 225
 226        srl     %i3, 0, %o3                             ! IEU0
 227        srl     %i2, 0, %o2                             ! IEU0  Group
 228        andcc   %l0, (_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT|_TIF_SYSCALL_TRACEPOINT|_TIF_NOHZ), %g0
 229        bne,pn  %icc, linux_syscall_trace32             ! CTI
 230         mov    %i0, %l5                                ! IEU1
 2315:      call    %l7                                     ! CTI   Group brk forced
 232         srl    %i5, 0, %o5                             ! IEU1
 233        ba,pt   %xcc, 3f
 234         sra    %o0, 0, %o0
 235
 236        /* Linux native system calls enter here... */
 237        .align  32
 238        .globl  linux_sparc_syscall
 239linux_sparc_syscall:
 240        /* Direct access to user regs, much faster. */
 241        cmp     %g1, NR_syscalls                        ! IEU1  Group
 242        bgeu,pn %xcc, linux_sparc_ni_syscall            ! CTI
 243         mov    %i0, %o0                                ! IEU0
 244        sll     %g1, 2, %l4                             ! IEU0  Group
 245        mov     %i1, %o1                                ! IEU1
 246        lduw    [%l7 + %l4], %l7                        ! Load
 2474:      mov     %i2, %o2                                ! IEU0  Group
 248        ldx     [%g6 + TI_FLAGS], %l0           ! Load
 249
 250        mov     %i3, %o3                                ! IEU1
 251        mov     %i4, %o4                                ! IEU0  Group
 252        andcc   %l0, (_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT|_TIF_SYSCALL_TRACEPOINT|_TIF_NOHZ), %g0
 253        bne,pn  %icc, linux_syscall_trace               ! CTI   Group
 254         mov    %i0, %l5                                ! IEU0
 2552:      call    %l7                                     ! CTI   Group brk forced
 256         mov    %i5, %o5                                ! IEU0
 257        nop
 258
 2593:      stx     %o0, [%sp + PTREGS_OFF + PT_V9_I0]
 260ret_sys_call:
 261        ldx     [%sp + PTREGS_OFF + PT_V9_TSTATE], %g3
 262        mov     %ulo(TSTATE_XCARRY | TSTATE_ICARRY), %g2
 263        sllx    %g2, 32, %g2
 264
 265        cmp     %o0, -ERESTART_RESTARTBLOCK
 266        bgeu,pn %xcc, 1f
 267         andcc  %l0, (_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT|_TIF_SYSCALL_TRACEPOINT|_TIF_NOHZ), %g0
 268        ldx     [%sp + PTREGS_OFF + PT_V9_TNPC], %l1 ! pc = npc
 269
 2702:
 271        /* System call success, clear Carry condition code. */
 272        andn    %g3, %g2, %g3
 2733:
 274        stx     %g3, [%sp + PTREGS_OFF + PT_V9_TSTATE]  
 275        bne,pn  %icc, linux_syscall_trace2
 276         add    %l1, 0x4, %l2                   ! npc = npc+4
 277        stx     %l1, [%sp + PTREGS_OFF + PT_V9_TPC]
 278        ba,pt   %xcc, rtrap
 279         stx    %l2, [%sp + PTREGS_OFF + PT_V9_TNPC]
 280
 2811:
 282        /* Check if force_successful_syscall_return()
 283         * was invoked.
 284         */
 285        ldub    [%g6 + TI_SYS_NOERROR], %l2
 286        brnz,pn %l2, 2b
 287         ldx    [%sp + PTREGS_OFF + PT_V9_TNPC], %l1 ! pc = npc
 288        /* System call failure, set Carry condition code.
 289         * Also, get abs(errno) to return to the process.
 290         */
 291        sub     %g0, %o0, %o0
 292        stx     %o0, [%sp + PTREGS_OFF + PT_V9_I0]
 293        ba,pt   %xcc, 3b
 294         or     %g3, %g2, %g3
 295
 296linux_syscall_trace2:
 297        call    syscall_trace_leave
 298         add    %sp, PTREGS_OFF, %o0
 299        stx     %l1, [%sp + PTREGS_OFF + PT_V9_TPC]
 300        ba,pt   %xcc, rtrap
 301         stx    %l2, [%sp + PTREGS_OFF + PT_V9_TNPC]
 302