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/* $Id: rtrap.S,v 1.47 1999/07/30 09:35:23 davem Exp $
* rtrap.S: Preparing for return from trap on Sparc V9.
*
* Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
* Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
*/
#include <asm/asi.h>
#include <asm/pstate.h>
#include <asm/ptrace.h>
#include <asm/spitfire.h>
#include <asm/head.h>
#include <asm/visasm.h>
#include <asm/processor.h>
#define PTREGS_OFF (STACK_BIAS + REGWIN_SZ)
.text
.align 32
.globl rtrap_clr_l6, rtrap
rtrap_clr_l6: clr %l6
/* Fall through */
rtrap: sethi %hi(bh_active), %l2
sethi %hi(bh_mask), %l1
ldx [%l2 + %lo(bh_active)], %l4
ldx [%l1 + %lo(bh_mask)], %l7
andcc %l4, %l7, %g0
be,pt %xcc, 2f
nop
call do_bottom_half
nop
2: ldx [%sp + PTREGS_OFF + PT_V9_TSTATE], %l1
sethi %hi(0xf << 20), %l4
andcc %l1, TSTATE_PRIV, %l3
and %l1, %l4, %l4
rdpr %pstate, %l7
andn %l1, %l4, %l1
be,pt %icc, to_user
andn %l7, PSTATE_IE, %l7
ldub [%g6 + AOFF_task_thread + AOFF_thread_fpdepth], %l5
brz,pt %l5, rt_continue
srl %l5, 1, %o0
add %g6, AOFF_task_thread + AOFF_thread_fpsaved, %l6
ldub [%l6 + %o0], %l2
sub %l5, 2, %l5
add %g6, AOFF_task_thread + AOFF_thread_gsr, %o1
andcc %l2, (FPRS_FEF|FPRS_DU), %g0
be,pt %icc, 2f
and %l2, FPRS_DL, %l6
andcc %l2, FPRS_FEF, %g0
be,pn %icc, 5f
sll %o0, 3, %o5
rd %fprs, %g5
wr %g5, FPRS_FEF, %fprs
ldub [%o1 + %o0], %g5
add %g6, AOFF_task_thread + AOFF_thread_xfsr, %o1
membar #StoreLoad | #LoadLoad
sll %o0, 8, %o2
add %g6, AOFF_task_fpregs, %o3
brz,pn %l6, 1f
add %g6, AOFF_task_fpregs+0x40, %o4
ldda [%o3 + %o2] ASI_BLK_P, %f0
ldda [%o4 + %o2] ASI_BLK_P, %f16
1: andcc %l2, FPRS_DU, %g0
be,pn %icc, 1f
wr %g5, 0, %gsr
add %o2, 0x80, %o2
ldda [%o3 + %o2] ASI_BLK_P, %f32
ldda [%o4 + %o2] ASI_BLK_P, %f48
1: membar #Sync
ldx [%o1 + %o5], %fsr
2: stb %l5, [%g6 + AOFF_task_thread + AOFF_thread_fpdepth]
rt_continue: ldx [%sp + PTREGS_OFF + PT_V9_G1], %g1
ldx [%sp + PTREGS_OFF + PT_V9_G2], %g2
ldx [%sp + PTREGS_OFF + PT_V9_G3], %g3
mov %g6, %o5
ldx [%sp + PTREGS_OFF + PT_V9_G4], %g4
ldx [%sp + PTREGS_OFF + PT_V9_G5], %g5
ldx [%sp + PTREGS_OFF + PT_V9_G6], %g6
ldx [%sp + PTREGS_OFF + PT_V9_G7], %g7
wrpr %l7, PSTATE_AG, %pstate
ldx [%sp + PTREGS_OFF + PT_V9_I0], %i0
ldx [%sp + PTREGS_OFF + PT_V9_I1], %i1
ldx [%sp + PTREGS_OFF + PT_V9_I2], %i2
ldx [%sp + PTREGS_OFF + PT_V9_I3], %i3
ldx [%sp + PTREGS_OFF + PT_V9_I4], %i4
ldx [%sp + PTREGS_OFF + PT_V9_I5], %i5
ldx [%sp + PTREGS_OFF + PT_V9_I6], %i6
ldx [%sp + PTREGS_OFF + PT_V9_I7], %i7
ld [%sp + PTREGS_OFF + PT_V9_Y], %o3
ldx [%sp + PTREGS_OFF + PT_V9_TPC], %l2
ldx [%sp + PTREGS_OFF + PT_V9_TNPC], %o2
wr %o3, %g0, %y
srl %l4, 20, %l4
wrpr %l4, 0x0, %pil
wrpr %g0, 0x1, %tl
wrpr %l1, %g0, %tstate
wrpr %l2, %g0, %tpc
wrpr %o2, %g0, %tnpc
brnz,pn %l3, kern_rtt
mov PRIMARY_CONTEXT, %l7
ldxa [%l7 + %l7] ASI_DMMU, %l0
stxa %l0, [%l7] ASI_DMMU
flush %o5
rdpr %wstate, %l1
rdpr %otherwin, %l2
srl %l1, 3, %l1
wrpr %l2, %g0, %canrestore
wrpr %l1, %g0, %wstate
wrpr %g0, %g0, %otherwin
restore
rdpr %canrestore, %g1
wrpr %g1, 0x0, %cleanwin
retry
kern_rtt: restore
retry
to_user: ldx [%g6 + AOFF_task_need_resched], %l0
wrpr %l7, PSTATE_IE, %pstate
orcc %g0, %l0, %g0
be,a,pt %xcc, check_signal
lduw [%g6 + AOFF_task_sigpending], %l0
call schedule
nop
lduw [%g6 + AOFF_task_sigpending], %l0
check_signal: brz,a,pt %l0, check_user_wins
nop
clr %o0
mov %l5, %o2
mov %l6, %o3
call do_signal
add %sp, STACK_BIAS + REGWIN_SZ, %o1
clr %l6
/* We must not take any traps between here and the actual
* return to user-space. If we do we risk having windows
* saved to the thread struct between the test and the
* actual return from trap. --DaveM
*/
check_user_wins:
wrpr %l7, 0x0, %pstate
ldub [%g6 + AOFF_task_thread + AOFF_thread_w_saved], %o2
brz,pt %o2, 1f
sethi %hi(TSTATE_PEF), %l6
wrpr %l7, PSTATE_IE, %pstate
call fault_in_user_windows
add %sp, STACK_BIAS + REGWIN_SZ, %o0
/* It is OK to leave interrupts on now because if
* fault_in_user_windows has returned it has left us
* with a clean user stack state.
*/
1:
#if 0
call rtrap_check
add %sp, STACK_BIAS + REGWIN_SZ, %o0
#endif
ldub [%g6 + AOFF_task_thread + AOFF_thread_flags], %l5
andcc %l5, SPARC_FLAG_PERFCTR, %g0
be,pt %xcc, 1f
nop
/* Don't forget to preserve user window invariants. */
wrpr %l7, PSTATE_IE, %pstate
call update_perfctrs
nop
wrpr %l7, 0x0, %pstate
ldub [%g6 + AOFF_task_thread + AOFF_thread_w_saved], %o2
brz,pt %o2, 1f
sethi %hi(TSTATE_PEF), %l6
wrpr %l7, PSTATE_IE, %pstate
call fault_in_user_windows
add %sp, STACK_BIAS + REGWIN_SZ, %o0
1:
andcc %l1, %l6, %g0
be,pt %xcc, rt_continue
stb %g0, [%g6 + AOFF_task_thread + AOFF_thread_fpdepth] ! This is neccessary for non-syscall rtraps only
rd %fprs, %l5
andcc %l5, FPRS_FEF, %g0
be,a,pn %icc, rt_continue
andn %l1, %l6, %l1
ba,pt %xcc, rt_continue
nop
5: wr %g0, FPRS_FEF, %fprs
membar #StoreLoad | #LoadLoad
sll %o0, 8, %o2
add %g6, AOFF_task_fpregs+0x80, %o3
add %g6, AOFF_task_fpregs+0xc0, %o4
ldda [%o3 + %o2] ASI_BLK_P, %f32
ldda [%o4 + %o2] ASI_BLK_P, %f48
1: membar #Sync
wr %g0, FPRS_DU, %fprs
ba,pt %xcc, rt_continue
stb %l5, [%g6 + AOFF_task_thread + AOFF_thread_fpdepth]
#undef PTREGS_OFF
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