| /* SunOS's execv() call only specifies the argv argument, the |
| * environment settings are the same as the calling processes. |
| */ |
| sys_execve: |
| sethi %hi(sparc_execve), %g1 |
| ba,pt %xcc, execve_merge |
| or %g1, %lo(sparc_execve), %g1 |
| |
| #ifdef CONFIG_COMPAT |
| sunos_execv: |
| stx %g0, [%sp + PTREGS_OFF + PT_V9_I2] |
| sys32_execve: |
| sethi %hi(sparc32_execve), %g1 |
| or %g1, %lo(sparc32_execve), %g1 |
| #endif |
| |
| execve_merge: |
| flushw |
| jmpl %g1, %g0 |
| add %sp, PTREGS_OFF, %o0 |
| |
| .align 32 |
| sys_pipe: |
| ba,pt %xcc, sparc_pipe |
| add %sp, PTREGS_OFF, %o0 |
| sys_nis_syscall: |
| ba,pt %xcc, c_sys_nis_syscall |
| add %sp, PTREGS_OFF, %o0 |
| sys_memory_ordering: |
| ba,pt %xcc, sparc_memory_ordering |
| add %sp, PTREGS_OFF, %o1 |
| sys_sigaltstack: |
| ba,pt %xcc, do_sigaltstack |
| add %i6, STACK_BIAS, %o2 |
| #ifdef CONFIG_COMPAT |
| sys32_sigstack: |
| ba,pt %xcc, do_sys32_sigstack |
| mov %i6, %o2 |
| sys32_sigaltstack: |
| ba,pt %xcc, do_sys32_sigaltstack |
| mov %i6, %o2 |
| #endif |
| .align 32 |
| #ifdef CONFIG_COMPAT |
| sys32_sigreturn: |
| add %sp, PTREGS_OFF, %o0 |
| call do_sigreturn32 |
| add %o7, 1f-.-4, %o7 |
| nop |
| #endif |
| sys_rt_sigreturn: |
| add %sp, PTREGS_OFF, %o0 |
| call do_rt_sigreturn |
| add %o7, 1f-.-4, %o7 |
| nop |
| #ifdef CONFIG_COMPAT |
| sys32_rt_sigreturn: |
| add %sp, PTREGS_OFF, %o0 |
| call do_rt_sigreturn32 |
| add %o7, 1f-.-4, %o7 |
| nop |
| #endif |
| .align 32 |
| 1: ldx [%g6 + TI_FLAGS], %l5 |
| andcc %l5, (_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT), %g0 |
| be,pt %icc, rtrap |
| nop |
| add %sp, PTREGS_OFF, %o0 |
| call syscall_trace |
| mov 1, %o1 |
| ba,pt %xcc, rtrap |
| nop |
| |
| /* This is how fork() was meant to be done, 8 instruction entry. |
| * |
| * I questioned the following code briefly, let me clear things |
| * up so you must not reason on it like I did. |
| * |
| * Know the fork_kpsr etc. we use in the sparc32 port? We don't |
| * need it here because the only piece of window state we copy to |
| * the child is the CWP register. Even if the parent sleeps, |
| * we are safe because we stuck it into pt_regs of the parent |
| * so it will not change. |
| * |
| * XXX This raises the question, whether we can do the same on |
| * XXX sparc32 to get rid of fork_kpsr _and_ fork_kwim. The |
| * XXX answer is yes. We stick fork_kpsr in UREG_G0 and |
| * XXX fork_kwim in UREG_G1 (global registers are considered |
| * XXX volatile across a system call in the sparc ABI I think |
| * XXX if it isn't we can use regs->y instead, anyone who depends |
| * XXX upon the Y register being preserved across a fork deserves |
| * XXX to lose). |
| * |
| * In fact we should take advantage of that fact for other things |
| * during system calls... |
| */ |
| .align 32 |
| sys_vfork: /* Under Linux, vfork and fork are just special cases of clone. */ |
| sethi %hi(0x4000 | 0x0100 | SIGCHLD), %o0 |
| or %o0, %lo(0x4000 | 0x0100 | SIGCHLD), %o0 |
| ba,pt %xcc, sys_clone |
| sys_fork: |
| clr %o1 |
| mov SIGCHLD, %o0 |
| sys_clone: |
| flushw |
| movrz %o1, %fp, %o1 |
| mov 0, %o3 |
| ba,pt %xcc, sparc_do_fork |
| add %sp, PTREGS_OFF, %o2 |
| |
| .globl ret_from_syscall |
| ret_from_syscall: |
| /* Clear current_thread_info()->new_child, and |
| * check performance counter stuff too. |
| */ |
| stb %g0, [%g6 + TI_NEW_CHILD] |
| ldx [%g6 + TI_FLAGS], %l0 |
| call schedule_tail |
| mov %g7, %o0 |
| andcc %l0, _TIF_PERFCTR, %g0 |
| be,pt %icc, 1f |
| nop |
| ldx [%g6 + TI_PCR], %o7 |
| wr %g0, %o7, %pcr |
| |
| /* Blackbird errata workaround. See commentary in |
| * smp.c:smp_percpu_timer_interrupt() for more |
| * information. |
| */ |
| ba,pt %xcc, 99f |
| nop |
| |
| .align 64 |
| 99: wr %g0, %g0, %pic |
| rd %pic, %g0 |
| |
| 1: ba,pt %xcc, ret_sys_call |
| ldx [%sp + PTREGS_OFF + PT_V9_I0], %o0 |
| |
| .globl sparc_exit |
| .type sparc_exit,#function |
| sparc_exit: |
| rdpr %pstate, %g2 |
| wrpr %g2, PSTATE_IE, %pstate |
| rdpr %otherwin, %g1 |
| rdpr %cansave, %g3 |
| add %g3, %g1, %g3 |
| wrpr %g3, 0x0, %cansave |
| wrpr %g0, 0x0, %otherwin |
| wrpr %g2, 0x0, %pstate |
| ba,pt %xcc, sys_exit |
| stb %g0, [%g6 + TI_WSAVED] |
| .size sparc_exit,.-sparc_exit |
| |
| linux_sparc_ni_syscall: |
| sethi %hi(sys_ni_syscall), %l7 |
| ba,pt %xcc, 4f |
| or %l7, %lo(sys_ni_syscall), %l7 |
| |
| linux_syscall_trace32: |
| add %sp, PTREGS_OFF, %o0 |
| call syscall_trace |
| clr %o1 |
| srl %i0, 0, %o0 |
| srl %i4, 0, %o4 |
| srl %i1, 0, %o1 |
| srl %i2, 0, %o2 |
| ba,pt %xcc, 2f |
| srl %i3, 0, %o3 |
| |
| linux_syscall_trace: |
| add %sp, PTREGS_OFF, %o0 |
| call syscall_trace |
| clr %o1 |
| mov %i0, %o0 |
| mov %i1, %o1 |
| mov %i2, %o2 |
| mov %i3, %o3 |
| b,pt %xcc, 2f |
| mov %i4, %o4 |
| |
| |
| /* Linux 32-bit system calls enter here... */ |
| .align 32 |
| .globl linux_sparc_syscall32 |
| linux_sparc_syscall32: |
| /* Direct access to user regs, much faster. */ |
| cmp %g1, NR_SYSCALLS ! IEU1 Group |
| bgeu,pn %xcc, linux_sparc_ni_syscall ! CTI |
| srl %i0, 0, %o0 ! IEU0 |
| sll %g1, 2, %l4 ! IEU0 Group |
| srl %i4, 0, %o4 ! IEU1 |
| lduw [%l7 + %l4], %l7 ! Load |
| srl %i1, 0, %o1 ! IEU0 Group |
| ldx [%g6 + TI_FLAGS], %l0 ! Load |
| |
| srl %i5, 0, %o5 ! IEU1 |
| srl %i2, 0, %o2 ! IEU0 Group |
| andcc %l0, (_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT), %g0 |
| bne,pn %icc, linux_syscall_trace32 ! CTI |
| mov %i0, %l5 ! IEU1 |
| call %l7 ! CTI Group brk forced |
| srl %i3, 0, %o3 ! IEU0 |
| ba,a,pt %xcc, 3f |
| |
| /* Linux native system calls enter here... */ |
| .align 32 |
| .globl linux_sparc_syscall |
| linux_sparc_syscall: |
| /* Direct access to user regs, much faster. */ |
| cmp %g1, NR_SYSCALLS ! IEU1 Group |
| bgeu,pn %xcc, linux_sparc_ni_syscall ! CTI |
| mov %i0, %o0 ! IEU0 |
| sll %g1, 2, %l4 ! IEU0 Group |
| mov %i1, %o1 ! IEU1 |
| lduw [%l7 + %l4], %l7 ! Load |
| 4: mov %i2, %o2 ! IEU0 Group |
| ldx [%g6 + TI_FLAGS], %l0 ! Load |
| |
| mov %i3, %o3 ! IEU1 |
| mov %i4, %o4 ! IEU0 Group |
| andcc %l0, (_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT), %g0 |
| bne,pn %icc, linux_syscall_trace ! CTI Group |
| mov %i0, %l5 ! IEU0 |
| 2: call %l7 ! CTI Group brk forced |
| mov %i5, %o5 ! IEU0 |
| nop |
| |
| 3: stx %o0, [%sp + PTREGS_OFF + PT_V9_I0] |
| ret_sys_call: |
| ldx [%sp + PTREGS_OFF + PT_V9_TSTATE], %g3 |
| ldx [%sp + PTREGS_OFF + PT_V9_TNPC], %l1 ! pc = npc |
| sra %o0, 0, %o0 |
| mov %ulo(TSTATE_XCARRY | TSTATE_ICARRY), %g2 |
| sllx %g2, 32, %g2 |
| |
| /* Check if force_successful_syscall_return() |
| * was invoked. |
| */ |
| ldub [%g6 + TI_SYS_NOERROR], %l2 |
| brnz,a,pn %l2, 80f |
| stb %g0, [%g6 + TI_SYS_NOERROR] |
| |
| cmp %o0, -ERESTART_RESTARTBLOCK |
| bgeu,pn %xcc, 1f |
| andcc %l0, (_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT), %l6 |
| 80: |
| /* System call success, clear Carry condition code. */ |
| andn %g3, %g2, %g3 |
| stx %g3, [%sp + PTREGS_OFF + PT_V9_TSTATE] |
| bne,pn %icc, linux_syscall_trace2 |
| add %l1, 0x4, %l2 ! npc = npc+4 |
| stx %l1, [%sp + PTREGS_OFF + PT_V9_TPC] |
| ba,pt %xcc, rtrap |
| stx %l2, [%sp + PTREGS_OFF + PT_V9_TNPC] |
| |
| 1: |
| /* System call failure, set Carry condition code. |
| * Also, get abs(errno) to return to the process. |
| */ |
| andcc %l0, (_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT), %l6 |
| sub %g0, %o0, %o0 |
| or %g3, %g2, %g3 |
| stx %o0, [%sp + PTREGS_OFF + PT_V9_I0] |
| stx %g3, [%sp + PTREGS_OFF + PT_V9_TSTATE] |
| bne,pn %icc, linux_syscall_trace2 |
| add %l1, 0x4, %l2 ! npc = npc+4 |
| stx %l1, [%sp + PTREGS_OFF + PT_V9_TPC] |
| |
| b,pt %xcc, rtrap |
| stx %l2, [%sp + PTREGS_OFF + PT_V9_TNPC] |
| linux_syscall_trace2: |
| add %sp, PTREGS_OFF, %o0 |
| call syscall_trace |
| mov 1, %o1 |
| stx %l1, [%sp + PTREGS_OFF + PT_V9_TPC] |
| ba,pt %xcc, rtrap |
| stx %l2, [%sp + PTREGS_OFF + PT_V9_TNPC] |
