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linux/arch/sparc64/kernel/etrap.S
David S. Miller 0835ae0f27 [SPARC64]: Replace cheetah+ code patching with variables. 
Instead of code patching to handle the page size fields in
the context registers, just use variables from which we get
the proper values.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-10-04 15:23:20 -07:00

259 lines
6.3 KiB
ArmAsm
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/* $Id: etrap.S,v 1.46 2002/02/09 19:49:30 davem Exp $
* etrap.S: Preparing for entry into the kernel on Sparc V9.
*
* Copyright (C) 1996, 1997 David S. Miller (davem@caip.rutgers.edu)
* Copyright (C) 1997, 1998, 1999 Jakub Jelinek (jj@ultra.linux.cz)
*/
#include <linux/config.h>
#include <asm/asi.h>
#include <asm/pstate.h>
#include <asm/ptrace.h>
#include <asm/page.h>
#include <asm/spitfire.h>
#include <asm/head.h>
#include <asm/processor.h>
#include <asm/mmu.h>
#define TASK_REGOFF (THREAD_SIZE-TRACEREG_SZ-STACKFRAME_SZ)
#define ETRAP_PSTATE1 (PSTATE_RMO | PSTATE_PRIV)
#define ETRAP_PSTATE2 \
(PSTATE_RMO | PSTATE_PEF | PSTATE_PRIV | PSTATE_IE)
/*
* On entry, %g7 is return address - 0x4.
* %g4 and %g5 will be preserved %l4 and %l5 respectively.
*/
.text
.align 64
.globl etrap, etrap_irq, etraptl1
etrap: rdpr %pil, %g2
etrap_irq:
rdpr %tstate, %g1
sllx %g2, 20, %g3
andcc %g1, TSTATE_PRIV, %g0
or %g1, %g3, %g1
bne,pn %xcc, 1f
sub %sp, STACKFRAME_SZ+TRACEREG_SZ-STACK_BIAS, %g2
wrpr %g0, 7, %cleanwin
sethi %hi(TASK_REGOFF), %g2
sethi %hi(TSTATE_PEF), %g3
or %g2, %lo(TASK_REGOFF), %g2
and %g1, %g3, %g3
brnz,pn %g3, 1f
add %g6, %g2, %g2
wr %g0, 0, %fprs
1: rdpr %tpc, %g3
stx %g1, [%g2 + STACKFRAME_SZ + PT_V9_TSTATE]
rdpr %tnpc, %g1
stx %g3, [%g2 + STACKFRAME_SZ + PT_V9_TPC]
rd %y, %g3
stx %g1, [%g2 + STACKFRAME_SZ + PT_V9_TNPC]
st %g3, [%g2 + STACKFRAME_SZ + PT_V9_Y]
save %g2, -STACK_BIAS, %sp ! Ordering here is critical
mov %g6, %l6
bne,pn %xcc, 3f
mov PRIMARY_CONTEXT, %l4
rdpr %canrestore, %g3
rdpr %wstate, %g2
wrpr %g0, 0, %canrestore
sll %g2, 3, %g2
mov 1, %l5
stb %l5, [%l6 + TI_FPDEPTH]
wrpr %g3, 0, %otherwin
wrpr %g2, 0, %wstate
sethi %hi(sparc64_kern_pri_context), %g2
ldx [%g2 + %lo(sparc64_kern_pri_context)], %g3
stxa %g3, [%l4] ASI_DMMU
flush %l6
wr %g0, ASI_AIUS, %asi
2: wrpr %g0, 0x0, %tl
mov %g4, %l4
mov %g5, %l5
mov %g7, %l2
wrpr %g0, ETRAP_PSTATE1, %pstate
stx %g1, [%sp + PTREGS_OFF + PT_V9_G1]
stx %g2, [%sp + PTREGS_OFF + PT_V9_G2]
stx %g3, [%sp + PTREGS_OFF + PT_V9_G3]
stx %g4, [%sp + PTREGS_OFF + PT_V9_G4]
stx %g5, [%sp + PTREGS_OFF + PT_V9_G5]
stx %g6, [%sp + PTREGS_OFF + PT_V9_G6]
stx %g7, [%sp + PTREGS_OFF + PT_V9_G7]
stx %i0, [%sp + PTREGS_OFF + PT_V9_I0]
stx %i1, [%sp + PTREGS_OFF + PT_V9_I1]
stx %i2, [%sp + PTREGS_OFF + PT_V9_I2]
stx %i3, [%sp + PTREGS_OFF + PT_V9_I3]
stx %i4, [%sp + PTREGS_OFF + PT_V9_I4]
stx %i5, [%sp + PTREGS_OFF + PT_V9_I5]
stx %i6, [%sp + PTREGS_OFF + PT_V9_I6]
stx %i7, [%sp + PTREGS_OFF + PT_V9_I7]
wrpr %g0, ETRAP_PSTATE2, %pstate
mov %l6, %g6
#ifdef CONFIG_SMP
mov TSB_REG, %g3
ldxa [%g3] ASI_IMMU, %g5
#endif
jmpl %l2 + 0x4, %g0
ldx [%g6 + TI_TASK], %g4
3: ldub [%l6 + TI_FPDEPTH], %l5
add %l6, TI_FPSAVED + 1, %l4
srl %l5, 1, %l3
add %l5, 2, %l5
stb %l5, [%l6 + TI_FPDEPTH]
ba,pt %xcc, 2b
stb %g0, [%l4 + %l3]
nop
etraptl1: /* Save tstate/tpc/tnpc of TL 1-->4 and the tl register itself.
* We place this right after pt_regs on the trap stack.
* The layout is:
* 0x00 TL1's TSTATE
* 0x08 TL1's TPC
* 0x10 TL1's TNPC
* 0x18 TL1's TT
* ...
* 0x58 TL4's TT
* 0x60 TL
*/
sub %sp, ((4 * 8) * 4) + 8, %g2
rdpr %tl, %g1
wrpr %g0, 1, %tl
rdpr %tstate, %g3
stx %g3, [%g2 + STACK_BIAS + 0x00]
rdpr %tpc, %g3
stx %g3, [%g2 + STACK_BIAS + 0x08]
rdpr %tnpc, %g3
stx %g3, [%g2 + STACK_BIAS + 0x10]
rdpr %tt, %g3
stx %g3, [%g2 + STACK_BIAS + 0x18]
wrpr %g0, 2, %tl
rdpr %tstate, %g3
stx %g3, [%g2 + STACK_BIAS + 0x20]
rdpr %tpc, %g3
stx %g3, [%g2 + STACK_BIAS + 0x28]
rdpr %tnpc, %g3
stx %g3, [%g2 + STACK_BIAS + 0x30]
rdpr %tt, %g3
stx %g3, [%g2 + STACK_BIAS + 0x38]
wrpr %g0, 3, %tl
rdpr %tstate, %g3
stx %g3, [%g2 + STACK_BIAS + 0x40]
rdpr %tpc, %g3
stx %g3, [%g2 + STACK_BIAS + 0x48]
rdpr %tnpc, %g3
stx %g3, [%g2 + STACK_BIAS + 0x50]
rdpr %tt, %g3
stx %g3, [%g2 + STACK_BIAS + 0x58]
wrpr %g0, 4, %tl
rdpr %tstate, %g3
stx %g3, [%g2 + STACK_BIAS + 0x60]
rdpr %tpc, %g3
stx %g3, [%g2 + STACK_BIAS + 0x68]
rdpr %tnpc, %g3
stx %g3, [%g2 + STACK_BIAS + 0x70]
rdpr %tt, %g3
stx %g3, [%g2 + STACK_BIAS + 0x78]
wrpr %g1, %tl
stx %g1, [%g2 + STACK_BIAS + 0x80]
rdpr %tstate, %g1
sub %g2, STACKFRAME_SZ + TRACEREG_SZ - STACK_BIAS, %g2
ba,pt %xcc, 1b
andcc %g1, TSTATE_PRIV, %g0
.align 64
.globl scetrap
scetrap: rdpr %pil, %g2
rdpr %tstate, %g1
sllx %g2, 20, %g3
andcc %g1, TSTATE_PRIV, %g0
or %g1, %g3, %g1
bne,pn %xcc, 1f
sub %sp, (STACKFRAME_SZ+TRACEREG_SZ-STACK_BIAS), %g2
wrpr %g0, 7, %cleanwin
sllx %g1, 51, %g3
sethi %hi(TASK_REGOFF), %g2
or %g2, %lo(TASK_REGOFF), %g2
brlz,pn %g3, 1f
add %g6, %g2, %g2
wr %g0, 0, %fprs
1: rdpr %tpc, %g3
stx %g1, [%g2 + STACKFRAME_SZ + PT_V9_TSTATE]
rdpr %tnpc, %g1
stx %g3, [%g2 + STACKFRAME_SZ + PT_V9_TPC]
stx %g1, [%g2 + STACKFRAME_SZ + PT_V9_TNPC]
save %g2, -STACK_BIAS, %sp ! Ordering here is critical
mov %g6, %l6
bne,pn %xcc, 2f
mov ASI_P, %l7
rdpr %canrestore, %g3
rdpr %wstate, %g2
wrpr %g0, 0, %canrestore
sll %g2, 3, %g2
mov PRIMARY_CONTEXT, %l4
wrpr %g3, 0, %otherwin
wrpr %g2, 0, %wstate
sethi %hi(sparc64_kern_pri_context), %g2
ldx [%g2 + %lo(sparc64_kern_pri_context)], %g3
stxa %g3, [%l4] ASI_DMMU
flush %l6
mov ASI_AIUS, %l7
2: mov %g4, %l4
mov %g5, %l5
add %g7, 0x4, %l2
wrpr %g0, ETRAP_PSTATE1, %pstate
stx %g1, [%sp + PTREGS_OFF + PT_V9_G1]
stx %g2, [%sp + PTREGS_OFF + PT_V9_G2]
sllx %l7, 24, %l7
stx %g3, [%sp + PTREGS_OFF + PT_V9_G3]
rdpr %cwp, %l0
stx %g4, [%sp + PTREGS_OFF + PT_V9_G4]
stx %g5, [%sp + PTREGS_OFF + PT_V9_G5]
stx %g6, [%sp + PTREGS_OFF + PT_V9_G6]
stx %g7, [%sp + PTREGS_OFF + PT_V9_G7]
or %l7, %l0, %l7
sethi %hi(TSTATE_RMO | TSTATE_PEF), %l0
or %l7, %l0, %l7
wrpr %l2, %tnpc
wrpr %l7, (TSTATE_PRIV | TSTATE_IE), %tstate
stx %i0, [%sp + PTREGS_OFF + PT_V9_I0]
stx %i1, [%sp + PTREGS_OFF + PT_V9_I1]
stx %i2, [%sp + PTREGS_OFF + PT_V9_I2]
stx %i3, [%sp + PTREGS_OFF + PT_V9_I3]
stx %i4, [%sp + PTREGS_OFF + PT_V9_I4]
stx %i5, [%sp + PTREGS_OFF + PT_V9_I5]
stx %i6, [%sp + PTREGS_OFF + PT_V9_I6]
mov %l6, %g6
stx %i7, [%sp + PTREGS_OFF + PT_V9_I7]
#ifdef CONFIG_SMP
mov TSB_REG, %g3
ldxa [%g3] ASI_IMMU, %g5
#endif
ldx [%g6 + TI_TASK], %g4
done
#undef TASK_REGOFF
#undef ETRAP_PSTATE1
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