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kernel-ark/arch/sparc/kernel/syscalls.S
Sam Ravnborg a88b5ba8bd sparc,sparc64: unify kernel/ 
o Move all files from sparc64/kernel/ to sparc/kernel
  - rename as appropriate
o Update sparc/Makefile to the changes
o Update sparc/kernel/Makefile to include the sparc64 files

NOTE: This commit changes link order on sparc64!

Link order had to change for either of sparc32 and sparc64.
And assuming sparc64 see more testing than sparc32 change link
order on sparc64 where issues will be caught faster.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2008-12-04 09:17:21 -08:00

280 lines
7.0 KiB
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/* 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
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, 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:
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), %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:
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]
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