mirror of
https://github.com/torvalds/linux.git
synced 2024-12-27 05:11:48 +00:00
261 lines
6.6 KiB
ArmAsm
261 lines
6.6 KiB
ArmAsm
/* SunOS's execv() call only specifies the argv argument, the
|
|
* environment settings are the same as the calling processes.
|
|
*/
|
|
sys64_execve:
|
|
set sys_execve, %g1
|
|
jmpl %g1, %g0
|
|
flushw
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
sunos_execv:
|
|
mov %g0, %o2
|
|
sys32_execve:
|
|
set compat_sys_execve, %g1
|
|
jmpl %g1, %g0
|
|
flushw
|
|
#endif
|
|
|
|
.align 32
|
|
sys_sparc_pipe:
|
|
ba,pt %xcc, sys_sparc_pipe_real
|
|
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
|
|
#ifdef CONFIG_COMPAT
|
|
sys32_sigstack:
|
|
ba,pt %xcc, do_sys32_sigstack
|
|
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|_TIF_SYSCALL_TRACEPOINT), %g0
|
|
be,pt %icc, rtrap
|
|
nop
|
|
call syscall_trace_leave
|
|
add %sp, PTREGS_OFF, %o0
|
|
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. */
|
|
stb %g0, [%g6 + TI_NEW_CHILD]
|
|
call schedule_tail
|
|
mov %g7, %o0
|
|
ldx [%sp + PTREGS_OFF + PT_V9_I0], %o0
|
|
brnz,pt %o0, ret_sys_call
|
|
ldx [%g6 + TI_FLAGS], %l0
|
|
ldx [%sp + PTREGS_OFF + PT_V9_G1], %l1
|
|
call %l1
|
|
ldx [%sp + PTREGS_OFF + PT_V9_G2], %o0
|
|
ba,pt %xcc, ret_sys_call
|
|
mov 0, %o0
|
|
|
|
.globl sparc_exit_group
|
|
.type sparc_exit_group,#function
|
|
sparc_exit_group:
|
|
sethi %hi(sys_exit_group), %g7
|
|
ba,pt %xcc, 1f
|
|
or %g7, %lo(sys_exit_group), %g7
|
|
.size sparc_exit_group,.-sparc_exit_group
|
|
|
|
.globl sparc_exit
|
|
.type sparc_exit,#function
|
|
sparc_exit:
|
|
sethi %hi(sys_exit), %g7
|
|
or %g7, %lo(sys_exit), %g7
|
|
1: 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
|
|
jmpl %g7, %g0
|
|
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:
|
|
call syscall_trace_enter
|
|
add %sp, PTREGS_OFF, %o0
|
|
brnz,pn %o0, 3f
|
|
mov -ENOSYS, %o0
|
|
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:
|
|
call syscall_trace_enter
|
|
add %sp, PTREGS_OFF, %o0
|
|
brnz,pn %o0, 3f
|
|
mov -ENOSYS, %o0
|
|
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|_TIF_SYSCALL_TRACEPOINT), %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|_TIF_SYSCALL_TRACEPOINT), %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
|
|
sra %o0, 0, %o0
|
|
mov %ulo(TSTATE_XCARRY | TSTATE_ICARRY), %g2
|
|
sllx %g2, 32, %g2
|
|
|
|
cmp %o0, -ERESTART_RESTARTBLOCK
|
|
bgeu,pn %xcc, 1f
|
|
andcc %l0, (_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT|_TIF_SYSCALL_TRACEPOINT), %g0
|
|
ldx [%sp + PTREGS_OFF + PT_V9_TNPC], %l1 ! pc = npc
|
|
|
|
2:
|
|
/* System call success, clear Carry condition code. */
|
|
andn %g3, %g2, %g3
|
|
3:
|
|
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:
|
|
/* Check if force_successful_syscall_return()
|
|
* was invoked.
|
|
*/
|
|
ldub [%g6 + TI_SYS_NOERROR], %l2
|
|
brnz,pn %l2, 2b
|
|
ldx [%sp + PTREGS_OFF + PT_V9_TNPC], %l1 ! pc = npc
|
|
/* System call failure, set Carry condition code.
|
|
* Also, get abs(errno) to return to the process.
|
|
*/
|
|
sub %g0, %o0, %o0
|
|
stx %o0, [%sp + PTREGS_OFF + PT_V9_I0]
|
|
ba,pt %xcc, 3b
|
|
or %g3, %g2, %g3
|
|
|
|
linux_syscall_trace2:
|
|
call syscall_trace_leave
|
|
add %sp, PTREGS_OFF, %o0
|
|
stx %l1, [%sp + PTREGS_OFF + PT_V9_TPC]
|
|
ba,pt %xcc, rtrap
|
|
stx %l2, [%sp + PTREGS_OFF + PT_V9_TNPC]
|