/* $Id$ * 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 #include #include #include #include #include #include #include #include #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