mirror of
https://github.com/torvalds/linux
synced 2024-10-23 19:57:28 +00:00
2863bc54ec
This reverts commit40138249c3andffa9009c98. There are problems with how the flag bytes were rearranged, in particular we really can't move values down into the lowest 16 bits since those are used for individual state bits. Signed-off-by: David S. Miller <davem@davemloft.net>
261 lines
6.8 KiB
ArmAsm
261 lines
6.8 KiB
ArmAsm
/* SunOS's execv() call only specifies the argv argument, the
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* environment settings are the same as the calling processes.
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*/
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sys_execve:
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sethi %hi(sparc_execve), %g1
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ba,pt %xcc, execve_merge
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or %g1, %lo(sparc_execve), %g1
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#ifdef CONFIG_COMPAT
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sunos_execv:
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stx %g0, [%sp + PTREGS_OFF + PT_V9_I2]
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sys32_execve:
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sethi %hi(sparc32_execve), %g1
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or %g1, %lo(sparc32_execve), %g1
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#endif
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execve_merge:
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flushw
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jmpl %g1, %g0
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add %sp, PTREGS_OFF, %o0
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.align 32
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sys_sparc_pipe:
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ba,pt %xcc, sys_sparc_pipe_real
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add %sp, PTREGS_OFF, %o0
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sys_nis_syscall:
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ba,pt %xcc, c_sys_nis_syscall
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add %sp, PTREGS_OFF, %o0
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sys_memory_ordering:
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ba,pt %xcc, sparc_memory_ordering
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add %sp, PTREGS_OFF, %o1
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sys_sigaltstack:
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ba,pt %xcc, do_sigaltstack
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add %i6, STACK_BIAS, %o2
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#ifdef CONFIG_COMPAT
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sys32_sigstack:
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ba,pt %xcc, do_sys32_sigstack
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mov %i6, %o2
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sys32_sigaltstack:
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ba,pt %xcc, do_sys32_sigaltstack
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mov %i6, %o2
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#endif
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.align 32
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#ifdef CONFIG_COMPAT
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sys32_sigreturn:
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add %sp, PTREGS_OFF, %o0
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call do_sigreturn32
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add %o7, 1f-.-4, %o7
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nop
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#endif
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sys_rt_sigreturn:
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add %sp, PTREGS_OFF, %o0
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call do_rt_sigreturn
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add %o7, 1f-.-4, %o7
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nop
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#ifdef CONFIG_COMPAT
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sys32_rt_sigreturn:
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add %sp, PTREGS_OFF, %o0
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call do_rt_sigreturn32
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add %o7, 1f-.-4, %o7
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nop
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#endif
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.align 32
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1: ldx [%g6 + TI_FLAGS], %l5
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andcc %l5, (_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT|_TIF_SYSCALL_TRACEPOINT), %g0
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be,pt %icc, rtrap
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nop
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call syscall_trace_leave
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add %sp, PTREGS_OFF, %o0
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ba,pt %xcc, rtrap
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nop
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/* This is how fork() was meant to be done, 8 instruction entry.
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*
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* I questioned the following code briefly, let me clear things
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* up so you must not reason on it like I did.
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*
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* Know the fork_kpsr etc. we use in the sparc32 port? We don't
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* need it here because the only piece of window state we copy to
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* the child is the CWP register. Even if the parent sleeps,
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* we are safe because we stuck it into pt_regs of the parent
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* so it will not change.
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*
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* XXX This raises the question, whether we can do the same on
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* XXX sparc32 to get rid of fork_kpsr _and_ fork_kwim. The
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* XXX answer is yes. We stick fork_kpsr in UREG_G0 and
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* XXX fork_kwim in UREG_G1 (global registers are considered
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* XXX volatile across a system call in the sparc ABI I think
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* XXX if it isn't we can use regs->y instead, anyone who depends
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* XXX upon the Y register being preserved across a fork deserves
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* XXX to lose).
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*
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* In fact we should take advantage of that fact for other things
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* during system calls...
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*/
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.align 32
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sys_vfork: /* Under Linux, vfork and fork are just special cases of clone. */
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sethi %hi(0x4000 | 0x0100 | SIGCHLD), %o0
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or %o0, %lo(0x4000 | 0x0100 | SIGCHLD), %o0
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ba,pt %xcc, sys_clone
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sys_fork:
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clr %o1
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mov SIGCHLD, %o0
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sys_clone:
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flushw
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movrz %o1, %fp, %o1
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mov 0, %o3
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ba,pt %xcc, sparc_do_fork
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add %sp, PTREGS_OFF, %o2
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.globl ret_from_syscall
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ret_from_syscall:
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/* Clear current_thread_info()->new_child. */
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stb %g0, [%g6 + TI_NEW_CHILD]
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ldx [%g6 + TI_FLAGS], %l0
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call schedule_tail
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mov %g7, %o0
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ba,pt %xcc, ret_sys_call
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ldx [%sp + PTREGS_OFF + PT_V9_I0], %o0
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.globl sparc_exit
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.type sparc_exit,#function
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sparc_exit:
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rdpr %pstate, %g2
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wrpr %g2, PSTATE_IE, %pstate
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rdpr %otherwin, %g1
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rdpr %cansave, %g3
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add %g3, %g1, %g3
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wrpr %g3, 0x0, %cansave
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wrpr %g0, 0x0, %otherwin
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wrpr %g2, 0x0, %pstate
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ba,pt %xcc, sys_exit
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stb %g0, [%g6 + TI_WSAVED]
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.size sparc_exit,.-sparc_exit
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linux_sparc_ni_syscall:
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sethi %hi(sys_ni_syscall), %l7
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ba,pt %xcc, 4f
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or %l7, %lo(sys_ni_syscall), %l7
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linux_syscall_trace32:
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call syscall_trace_enter
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add %sp, PTREGS_OFF, %o0
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brnz,pn %o0, 3f
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mov -ENOSYS, %o0
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srl %i0, 0, %o0
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srl %i4, 0, %o4
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srl %i1, 0, %o1
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srl %i2, 0, %o2
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ba,pt %xcc, 2f
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srl %i3, 0, %o3
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linux_syscall_trace:
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call syscall_trace_enter
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add %sp, PTREGS_OFF, %o0
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brnz,pn %o0, 3f
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mov -ENOSYS, %o0
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mov %i0, %o0
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mov %i1, %o1
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mov %i2, %o2
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mov %i3, %o3
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b,pt %xcc, 2f
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mov %i4, %o4
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/* Linux 32-bit system calls enter here... */
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.align 32
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.globl linux_sparc_syscall32
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linux_sparc_syscall32:
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/* Direct access to user regs, much faster. */
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cmp %g1, NR_syscalls ! IEU1 Group
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bgeu,pn %xcc, linux_sparc_ni_syscall ! CTI
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srl %i0, 0, %o0 ! IEU0
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sll %g1, 2, %l4 ! IEU0 Group
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srl %i4, 0, %o4 ! IEU1
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lduw [%l7 + %l4], %l7 ! Load
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srl %i1, 0, %o1 ! IEU0 Group
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ldx [%g6 + TI_FLAGS], %l0 ! Load
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srl %i5, 0, %o5 ! IEU1
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srl %i2, 0, %o2 ! IEU0 Group
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andcc %l0, (_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT|_TIF_SYSCALL_TRACEPOINT), %g0
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bne,pn %icc, linux_syscall_trace32 ! CTI
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mov %i0, %l5 ! IEU1
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call %l7 ! CTI Group brk forced
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srl %i3, 0, %o3 ! IEU0
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ba,a,pt %xcc, 3f
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/* Linux native system calls enter here... */
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.align 32
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.globl linux_sparc_syscall
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linux_sparc_syscall:
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/* Direct access to user regs, much faster. */
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cmp %g1, NR_syscalls ! IEU1 Group
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bgeu,pn %xcc, linux_sparc_ni_syscall ! CTI
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mov %i0, %o0 ! IEU0
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sll %g1, 2, %l4 ! IEU0 Group
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mov %i1, %o1 ! IEU1
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lduw [%l7 + %l4], %l7 ! Load
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4: mov %i2, %o2 ! IEU0 Group
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ldx [%g6 + TI_FLAGS], %l0 ! Load
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mov %i3, %o3 ! IEU1
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mov %i4, %o4 ! IEU0 Group
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andcc %l0, (_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT|_TIF_SYSCALL_TRACEPOINT), %g0
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bne,pn %icc, linux_syscall_trace ! CTI Group
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mov %i0, %l5 ! IEU0
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2: call %l7 ! CTI Group brk forced
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mov %i5, %o5 ! IEU0
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nop
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3: stx %o0, [%sp + PTREGS_OFF + PT_V9_I0]
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ret_sys_call:
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ldx [%sp + PTREGS_OFF + PT_V9_TSTATE], %g3
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ldx [%sp + PTREGS_OFF + PT_V9_TNPC], %l1 ! pc = npc
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sra %o0, 0, %o0
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mov %ulo(TSTATE_XCARRY | TSTATE_ICARRY), %g2
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sllx %g2, 32, %g2
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/* Check if force_successful_syscall_return()
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* was invoked.
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*/
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ldub [%g6 + TI_SYS_NOERROR], %l2
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brnz,a,pn %l2, 80f
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stb %g0, [%g6 + TI_SYS_NOERROR]
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cmp %o0, -ERESTART_RESTARTBLOCK
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bgeu,pn %xcc, 1f
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andcc %l0, (_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT|_TIF_SYSCALL_TRACEPOINT), %l6
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80:
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/* System call success, clear Carry condition code. */
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andn %g3, %g2, %g3
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stx %g3, [%sp + PTREGS_OFF + PT_V9_TSTATE]
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bne,pn %icc, linux_syscall_trace2
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add %l1, 0x4, %l2 ! npc = npc+4
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stx %l1, [%sp + PTREGS_OFF + PT_V9_TPC]
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ba,pt %xcc, rtrap
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stx %l2, [%sp + PTREGS_OFF + PT_V9_TNPC]
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1:
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/* System call failure, set Carry condition code.
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* Also, get abs(errno) to return to the process.
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*/
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andcc %l0, (_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT|_TIF_SYSCALL_TRACEPOINT), %l6
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sub %g0, %o0, %o0
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or %g3, %g2, %g3
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stx %o0, [%sp + PTREGS_OFF + PT_V9_I0]
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stx %g3, [%sp + PTREGS_OFF + PT_V9_TSTATE]
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bne,pn %icc, linux_syscall_trace2
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add %l1, 0x4, %l2 ! npc = npc+4
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stx %l1, [%sp + PTREGS_OFF + PT_V9_TPC]
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b,pt %xcc, rtrap
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stx %l2, [%sp + PTREGS_OFF + PT_V9_TNPC]
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linux_syscall_trace2:
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call syscall_trace_leave
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add %sp, PTREGS_OFF, %o0
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stx %l1, [%sp + PTREGS_OFF + PT_V9_TPC]
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ba,pt %xcc, rtrap
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stx %l2, [%sp + PTREGS_OFF + PT_V9_TNPC]
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