mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-30 14:36:46 +07:00
2d7d5f0511
This also includes by necessity _TIF_RESTORE_SIGMASK support, which actually resulted in a lot of cleanups. The sparc signal handling code is quite a mess and I should clean it up some day. Signed-off-by: David S. Miller <davem@davemloft.net>
345 lines
9.3 KiB
ArmAsm
345 lines
9.3 KiB
ArmAsm
/* $Id: rtrap.S,v 1.61 2002/02/09 19:49:31 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 <linux/config.h>
|
|
|
|
#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 RTRAP_PSTATE (PSTATE_RMO|PSTATE_PEF|PSTATE_PRIV|PSTATE_IE)
|
|
#define RTRAP_PSTATE_IRQOFF (PSTATE_RMO|PSTATE_PEF|PSTATE_PRIV)
|
|
#define RTRAP_PSTATE_AG_IRQOFF (PSTATE_RMO|PSTATE_PEF|PSTATE_PRIV|PSTATE_AG)
|
|
|
|
/* Register %l6 keeps track of whether we are returning
|
|
* from a system call or not. It is cleared if we call
|
|
* do_notify_resume, and it must not be otherwise modified
|
|
* until we fully commit to returning to userspace.
|
|
*/
|
|
|
|
.text
|
|
.align 32
|
|
__handle_softirq:
|
|
call do_softirq
|
|
nop
|
|
ba,a,pt %xcc, __handle_softirq_continue
|
|
nop
|
|
__handle_preemption:
|
|
call schedule
|
|
wrpr %g0, RTRAP_PSTATE, %pstate
|
|
ba,pt %xcc, __handle_preemption_continue
|
|
wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
|
|
|
|
__handle_user_windows:
|
|
call fault_in_user_windows
|
|
wrpr %g0, RTRAP_PSTATE, %pstate
|
|
wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
|
|
/* Redo sched+sig checks */
|
|
ldx [%g6 + TI_FLAGS], %l0
|
|
andcc %l0, _TIF_NEED_RESCHED, %g0
|
|
|
|
be,pt %xcc, 1f
|
|
nop
|
|
call schedule
|
|
wrpr %g0, RTRAP_PSTATE, %pstate
|
|
wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
|
|
ldx [%g6 + TI_FLAGS], %l0
|
|
|
|
1: andcc %l0, (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK), %g0
|
|
be,pt %xcc, __handle_user_windows_continue
|
|
nop
|
|
mov %l5, %o1
|
|
mov %l6, %o2
|
|
add %sp, PTREGS_OFF, %o0
|
|
mov %l0, %o3
|
|
|
|
call do_notify_resume
|
|
wrpr %g0, RTRAP_PSTATE, %pstate
|
|
wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
|
|
clr %l6
|
|
/* Signal delivery can modify pt_regs tstate, so we must
|
|
* reload it.
|
|
*/
|
|
ldx [%sp + PTREGS_OFF + PT_V9_TSTATE], %l1
|
|
sethi %hi(0xf << 20), %l4
|
|
and %l1, %l4, %l4
|
|
ba,pt %xcc, __handle_user_windows_continue
|
|
|
|
andn %l1, %l4, %l1
|
|
__handle_perfctrs:
|
|
call update_perfctrs
|
|
wrpr %g0, RTRAP_PSTATE, %pstate
|
|
wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
|
|
ldub [%g6 + TI_WSAVED], %o2
|
|
brz,pt %o2, 1f
|
|
nop
|
|
/* Redo userwin+sched+sig checks */
|
|
call fault_in_user_windows
|
|
|
|
wrpr %g0, RTRAP_PSTATE, %pstate
|
|
wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
|
|
ldx [%g6 + TI_FLAGS], %l0
|
|
andcc %l0, _TIF_NEED_RESCHED, %g0
|
|
be,pt %xcc, 1f
|
|
|
|
nop
|
|
call schedule
|
|
wrpr %g0, RTRAP_PSTATE, %pstate
|
|
wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
|
|
ldx [%g6 + TI_FLAGS], %l0
|
|
1: andcc %l0, (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK), %g0
|
|
|
|
be,pt %xcc, __handle_perfctrs_continue
|
|
sethi %hi(TSTATE_PEF), %o0
|
|
mov %l5, %o1
|
|
mov %l6, %o2
|
|
add %sp, PTREGS_OFF, %o0
|
|
mov %l0, %o3
|
|
call do_notify_resume
|
|
|
|
wrpr %g0, RTRAP_PSTATE, %pstate
|
|
wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
|
|
clr %l6
|
|
/* Signal delivery can modify pt_regs tstate, so we must
|
|
* reload it.
|
|
*/
|
|
ldx [%sp + PTREGS_OFF + PT_V9_TSTATE], %l1
|
|
sethi %hi(0xf << 20), %l4
|
|
and %l1, %l4, %l4
|
|
andn %l1, %l4, %l1
|
|
ba,pt %xcc, __handle_perfctrs_continue
|
|
|
|
sethi %hi(TSTATE_PEF), %o0
|
|
__handle_userfpu:
|
|
rd %fprs, %l5
|
|
andcc %l5, FPRS_FEF, %g0
|
|
sethi %hi(TSTATE_PEF), %o0
|
|
be,a,pn %icc, __handle_userfpu_continue
|
|
andn %l1, %o0, %l1
|
|
ba,a,pt %xcc, __handle_userfpu_continue
|
|
|
|
__handle_signal:
|
|
mov %l5, %o1
|
|
mov %l6, %o2
|
|
add %sp, PTREGS_OFF, %o0
|
|
mov %l0, %o3
|
|
call do_notify_resume
|
|
wrpr %g0, RTRAP_PSTATE, %pstate
|
|
wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
|
|
clr %l6
|
|
|
|
/* Signal delivery can modify pt_regs tstate, so we must
|
|
* reload it.
|
|
*/
|
|
ldx [%sp + PTREGS_OFF + PT_V9_TSTATE], %l1
|
|
sethi %hi(0xf << 20), %l4
|
|
and %l1, %l4, %l4
|
|
ba,pt %xcc, __handle_signal_continue
|
|
andn %l1, %l4, %l1
|
|
|
|
.align 64
|
|
.globl rtrap_irq, rtrap_clr_l6, rtrap, irqsz_patchme, rtrap_xcall
|
|
rtrap_irq:
|
|
rtrap_clr_l6: clr %l6
|
|
rtrap:
|
|
#ifndef CONFIG_SMP
|
|
sethi %hi(per_cpu____cpu_data), %l0
|
|
lduw [%l0 + %lo(per_cpu____cpu_data)], %l1
|
|
#else
|
|
sethi %hi(per_cpu____cpu_data), %l0
|
|
or %l0, %lo(per_cpu____cpu_data), %l0
|
|
lduw [%l0 + %g5], %l1
|
|
#endif
|
|
cmp %l1, 0
|
|
|
|
/* mm/ultra.S:xcall_report_regs KNOWS about this load. */
|
|
bne,pn %icc, __handle_softirq
|
|
ldx [%sp + PTREGS_OFF + PT_V9_TSTATE], %l1
|
|
__handle_softirq_continue:
|
|
rtrap_xcall:
|
|
sethi %hi(0xf << 20), %l4
|
|
andcc %l1, TSTATE_PRIV, %l3
|
|
and %l1, %l4, %l4
|
|
bne,pn %icc, to_kernel
|
|
andn %l1, %l4, %l1
|
|
|
|
/* We must hold IRQs off and atomically test schedule+signal
|
|
* state, then hold them off all the way back to userspace.
|
|
* If we are returning to kernel, none of this matters.
|
|
*
|
|
* If we do not do this, there is a window where we would do
|
|
* the tests, later the signal/resched event arrives but we do
|
|
* not process it since we are still in kernel mode. It would
|
|
* take until the next local IRQ before the signal/resched
|
|
* event would be handled.
|
|
*
|
|
* This also means that if we have to deal with performance
|
|
* counters or user windows, we have to redo all of these
|
|
* sched+signal checks with IRQs disabled.
|
|
*/
|
|
to_user: wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
|
|
wrpr 0, %pil
|
|
__handle_preemption_continue:
|
|
ldx [%g6 + TI_FLAGS], %l0
|
|
sethi %hi(_TIF_USER_WORK_MASK), %o0
|
|
or %o0, %lo(_TIF_USER_WORK_MASK), %o0
|
|
andcc %l0, %o0, %g0
|
|
sethi %hi(TSTATE_PEF), %o0
|
|
be,pt %xcc, user_nowork
|
|
andcc %l1, %o0, %g0
|
|
andcc %l0, _TIF_NEED_RESCHED, %g0
|
|
bne,pn %xcc, __handle_preemption
|
|
andcc %l0, (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK), %g0
|
|
bne,pn %xcc, __handle_signal
|
|
__handle_signal_continue:
|
|
ldub [%g6 + TI_WSAVED], %o2
|
|
brnz,pn %o2, __handle_user_windows
|
|
nop
|
|
__handle_user_windows_continue:
|
|
ldx [%g6 + TI_FLAGS], %l5
|
|
andcc %l5, _TIF_PERFCTR, %g0
|
|
sethi %hi(TSTATE_PEF), %o0
|
|
bne,pn %xcc, __handle_perfctrs
|
|
__handle_perfctrs_continue:
|
|
andcc %l1, %o0, %g0
|
|
|
|
/* This fpdepth clear is necessary for non-syscall rtraps only */
|
|
user_nowork:
|
|
bne,pn %xcc, __handle_userfpu
|
|
stb %g0, [%g6 + TI_FPDEPTH]
|
|
__handle_userfpu_continue:
|
|
|
|
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
|
|
ldx [%sp + PTREGS_OFF + PT_V9_G4], %g4
|
|
ldx [%sp + PTREGS_OFF + PT_V9_G5], %g5
|
|
mov TSB_REG, %g6
|
|
brnz,a,pn %l3, 1f
|
|
ldxa [%g6] ASI_IMMU, %g5
|
|
1: ldx [%sp + PTREGS_OFF + PT_V9_G6], %g6
|
|
ldx [%sp + PTREGS_OFF + PT_V9_G7], %g7
|
|
wrpr %g0, RTRAP_PSTATE_AG_IRQOFF, %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
|
|
ldx [%sp + PTREGS_OFF + PT_V9_TPC], %l2
|
|
ldx [%sp + PTREGS_OFF + PT_V9_TNPC], %o2
|
|
|
|
ld [%sp + PTREGS_OFF + PT_V9_Y], %o3
|
|
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
|
|
sethi %hi(sparc64_kern_pri_nuc_bits), %l1
|
|
ldx [%l1 + %lo(sparc64_kern_pri_nuc_bits)], %l1
|
|
or %l0, %l1, %l0
|
|
stxa %l0, [%l7] ASI_DMMU
|
|
flush %g6
|
|
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
|
|
nop
|
|
|
|
kern_rtt: restore
|
|
retry
|
|
to_kernel:
|
|
#ifdef CONFIG_PREEMPT
|
|
ldsw [%g6 + TI_PRE_COUNT], %l5
|
|
brnz %l5, kern_fpucheck
|
|
ldx [%g6 + TI_FLAGS], %l5
|
|
andcc %l5, _TIF_NEED_RESCHED, %g0
|
|
be,pt %xcc, kern_fpucheck
|
|
srl %l4, 20, %l5
|
|
cmp %l5, 0
|
|
bne,pn %xcc, kern_fpucheck
|
|
sethi %hi(PREEMPT_ACTIVE), %l6
|
|
stw %l6, [%g6 + TI_PRE_COUNT]
|
|
call schedule
|
|
nop
|
|
ba,pt %xcc, rtrap
|
|
stw %g0, [%g6 + TI_PRE_COUNT]
|
|
#endif
|
|
kern_fpucheck: ldub [%g6 + TI_FPDEPTH], %l5
|
|
brz,pt %l5, rt_continue
|
|
srl %l5, 1, %o0
|
|
add %g6, TI_FPSAVED, %l6
|
|
ldub [%l6 + %o0], %l2
|
|
sub %l5, 2, %l5
|
|
|
|
add %g6, TI_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, %g1
|
|
|
|
wr %g1, FPRS_FEF, %fprs
|
|
ldx [%o1 + %o5], %g1
|
|
add %g6, TI_XFSR, %o1
|
|
sll %o0, 8, %o2
|
|
add %g6, TI_FPREGS, %o3
|
|
brz,pn %l6, 1f
|
|
add %g6, TI_FPREGS+0x40, %o4
|
|
|
|
membar #Sync
|
|
ldda [%o3 + %o2] ASI_BLK_P, %f0
|
|
ldda [%o4 + %o2] ASI_BLK_P, %f16
|
|
membar #Sync
|
|
1: andcc %l2, FPRS_DU, %g0
|
|
be,pn %icc, 1f
|
|
wr %g1, 0, %gsr
|
|
add %o2, 0x80, %o2
|
|
membar #Sync
|
|
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 + TI_FPDEPTH]
|
|
ba,pt %xcc, rt_continue
|
|
nop
|
|
5: wr %g0, FPRS_FEF, %fprs
|
|
sll %o0, 8, %o2
|
|
|
|
add %g6, TI_FPREGS+0x80, %o3
|
|
add %g6, TI_FPREGS+0xc0, %o4
|
|
membar #Sync
|
|
ldda [%o3 + %o2] ASI_BLK_P, %f32
|
|
ldda [%o4 + %o2] ASI_BLK_P, %f48
|
|
membar #Sync
|
|
wr %g0, FPRS_DU, %fprs
|
|
ba,pt %xcc, rt_continue
|
|
stb %l5, [%g6 + TI_FPDEPTH]
|