etrap.S
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- /* $Id: etrap.S,v 1.45 2001/09/07 21:04:40 kanoj 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 <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>
- #define TASK_REGOFF (THREAD_SIZE-TRACEREG_SZ-REGWIN_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 ! Single Group
- etrap_irq: rdpr %tstate, %g1 ! Single Group
- sllx %g2, 20, %g3 ! IEU0 Group
- andcc %g1, TSTATE_PRIV, %g0 ! IEU1
- or %g1, %g3, %g1 ! IEU0 Group
- bne,pn %xcc, 1f ! CTI
- sub %sp, REGWIN_SZ+TRACEREG_SZ-STACK_BIAS, %g2 ! IEU1
- wrpr %g0, 7, %cleanwin ! Single Group+4bubbles
- sethi %hi(TASK_REGOFF), %g2 ! IEU0 Group
- sethi %hi(TSTATE_PEF), %g3 ! IEU1
- or %g2, %lo(TASK_REGOFF), %g2 ! IEU0 Group
- and %g1, %g3, %g3 ! IEU1
- brnz,pn %g3, 1f ! CTI+IEU1 Group
- add %g6, %g2, %g2 ! IEU0
- wr %g0, 0, %fprs ! Single Group+4bubbles
- 1: rdpr %tpc, %g3 ! Single Group
- stx %g1, [%g2 + REGWIN_SZ + PT_V9_TSTATE] ! Store Group
- rdpr %tnpc, %g1 ! Single Group
- stx %g3, [%g2 + REGWIN_SZ + PT_V9_TPC] ! Store Group
- rd %y, %g3 ! Single Group+4bubbles
- stx %g1, [%g2 + REGWIN_SZ + PT_V9_TNPC] ! Store Group
- st %g3, [%g2 + REGWIN_SZ + PT_V9_Y] ! Store Group
- save %g2, -STACK_BIAS, %sp ! Ordering here is critical ! Single Group
- mov %g6, %l6 ! IEU0 Group
- bne,pn %xcc, 3f ! CTI
- mov PRIMARY_CONTEXT, %l4 ! IEU1
- rdpr %canrestore, %g3 ! Single Group+4bubbles
- rdpr %wstate, %g2 ! Single Group+4bubbles
- wrpr %g0, 0, %canrestore ! Single Group+4bubbles
- sll %g2, 3, %g2 ! IEU0 Group
- mov 1, %l5 ! IEU1
- stb %l5, [%l6 + AOFF_task_thread + AOFF_thread_fpdepth] ! Store
- wrpr %g3, 0, %otherwin ! Single Group+4bubbles
- wrpr %g2, 0, %wstate ! Single Group+4bubbles
- stxa %g0, [%l4] ASI_DMMU ! Store Group
- flush %l6 ! Single Group+9bubbles
- wr %g0, ASI_AIUS, %asi ! Single Group+4bubbles
- 2: wrpr %g0, 0x0, %tl ! Single Group+4bubbles
- mov %g4, %l4 ! IEU1
- mov %g5, %l5 ! IEU0 Group
- mov %g7, %l2 ! IEU1
- wrpr %g0, ETRAP_PSTATE1, %pstate ! Single Group+4bubbles
- stx %g1, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_G1] ! Store Group
- stx %g2, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_G2] ! Store Group
- stx %g3, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_G3] ! Store Group
- stx %g4, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_G4] ! Store Group
- stx %g5, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_G5] ! Store Group
- stx %g6, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_G6] ! Store Group
- stx %g7, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_G7] ! Store Group
- stx %i0, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_I0] ! Store Group
- stx %i1, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_I1] ! Store Group
- stx %i2, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_I2] ! Store Group
- stx %i3, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_I3] ! Store Group
- stx %i4, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_I4] ! Store Group
- sethi %uhi(PAGE_OFFSET), %g4 ! IEU0
- stx %i5, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_I5] ! Store Group
- stx %i6, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_I6] ! Store Group
- sllx %g4, 32, %g4 ! IEU0
- stx %i7, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_I7] ! Store Group
- wrpr %g0, ETRAP_PSTATE2, %pstate ! Single Group+4bubbles
- jmpl %l2 + 0x4, %g0 ! CTI Group
- mov %l6, %g6 ! IEU0
- nop
- nop
- 3: ldub [%l6 + AOFF_task_thread + AOFF_thread_fpdepth], %l5 ! Load Group
- add %l6, AOFF_task_thread + AOFF_thread_fpsaved + 1, %l4 ! IEU0
- srl %l5, 1, %l3 ! IEU0 Group
- add %l5, 2, %l5 ! IEU1
- stb %l5, [%l6 + AOFF_task_thread + AOFF_thread_fpdepth] ! Store
- ba,pt %xcc, 2b ! CTI
- stb %g0, [%l4 + %l3] ! Store Group
- 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 ! Single Group+4bubbles
- sub %g2, REGWIN_SZ + TRACEREG_SZ - STACK_BIAS, %g2 ! IEU1
- ba,pt %xcc, 1b ! CTI Group
- andcc %g1, TSTATE_PRIV, %g0 ! IEU0
- .align 64
- .globl scetrap
- scetrap: rdpr %pil, %g2 ! Single Group
- rdpr %tstate, %g1 ! Single Group
- sllx %g2, 20, %g3 ! IEU0 Group
- andcc %g1, TSTATE_PRIV, %g0 ! IEU1
- or %g1, %g3, %g1 ! IEU0 Group
- bne,pn %xcc, 1f ! CTI
- sub %sp, (REGWIN_SZ+TRACEREG_SZ-STACK_BIAS), %g2 ! IEU1
- wrpr %g0, 7, %cleanwin ! Single Group+4bubbles
- sllx %g1, 51, %g3 ! IEU0 Group
- sethi %hi(TASK_REGOFF), %g2 ! IEU1
- or %g2, %lo(TASK_REGOFF), %g2 ! IEU0 Group
- brlz,pn %g3, 1f ! CTI+IEU1
- add %g6, %g2, %g2 ! IEU0 Group
- wr %g0, 0, %fprs ! Single Group+4bubbles
- 1: rdpr %tpc, %g3 ! Single Group
- stx %g1, [%g2 + REGWIN_SZ + PT_V9_TSTATE] ! Store Group
- rdpr %tnpc, %g1 ! Single Group
- stx %g3, [%g2 + REGWIN_SZ + PT_V9_TPC] ! Store Group
- stx %g1, [%g2 + REGWIN_SZ + PT_V9_TNPC] ! Store Group
- save %g2, -STACK_BIAS, %sp ! Ordering here is critical ! Single Group
- mov %g6, %l6 ! IEU0 Group
- bne,pn %xcc, 2f ! CTI
- mov ASI_P, %l7 ! IEU1
- rdpr %canrestore, %g3 ! Single Group+4bubbles
- rdpr %wstate, %g2 ! Single Group+4bubbles
- wrpr %g0, 0, %canrestore ! Single Group+4bubbles
- sll %g2, 3, %g2 ! IEU0 Group
- mov PRIMARY_CONTEXT, %l4 ! IEU1
- wrpr %g3, 0, %otherwin ! Single Group+4bubbles
- wrpr %g2, 0, %wstate ! Single Group+4bubbles
- stxa %g0, [%l4] ASI_DMMU ! Store
- flush %l6 ! Single Group+9bubbles
- mov ASI_AIUS, %l7 ! IEU0 Group
- 2: mov %g4, %l4 ! IEU1
- mov %g5, %l5 ! IEU0 Group
- add %g7, 0x4, %l2 ! IEU1
- wrpr %g0, ETRAP_PSTATE1, %pstate ! Single Group+4bubbles
- stx %g1, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_G1] ! Store Group
- stx %g2, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_G2] ! Store Group
- sllx %l7, 24, %l7 ! IEU0
- stx %g3, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_G3] ! Store Group
- rdpr %cwp, %l0 ! Single Group
- stx %g4, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_G4] ! Store Group
- stx %g5, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_G5] ! Store Group
- stx %g6, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_G6] ! Store Group
- stx %g7, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_G7] ! Store Group
- or %l7, %l0, %l7 ! IEU0
- sethi %hi(TSTATE_RMO | TSTATE_PEF), %l0 ! IEU1
- or %l7, %l0, %l7 ! IEU0 Group
- wrpr %l2, %tnpc ! Single Group+4bubbles
- wrpr %l7, (TSTATE_PRIV | TSTATE_IE), %tstate ! Single Group+4bubbles
- stx %i0, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_I0] ! Store Group
- stx %i1, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_I1] ! Store Group
- stx %i2, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_I2] ! Store Group
- stx %i3, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_I3] ! Store Group
- stx %i4, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_I4] ! Store Group
- sethi %uhi(PAGE_OFFSET), %g4 ! IEU0
- stx %i5, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_I5] ! Store Group
- stx %i6, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_I6] ! Store Group
- sllx %g4, 32, %g4 ! IEU0
- mov %l6, %g6 ! IEU1
- stx %i7, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_I7] ! Store Group
- done
- nop
- #undef TASK_REGOFF
- #undef ETRAP_PSTATE1
- #undef ETRAP_PSTATE2