/* $Id: rtrap.S,v 1.46 1999/05/25 16:53:20 jj 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 #include #include #include #include #include #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_tss + AOFF_thread_fpdepth], %l5 brz,pt %l5, rt_continue srl %l5, 1, %o0 add %g6, AOFF_task_tss + AOFF_thread_fpsaved, %l6 ldub [%l6 + %o0], %l2 sub %l5, 2, %l5 add %g6, AOFF_task_tss + 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_tss + 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_tss + AOFF_thread_fpdepth] rt_continue: lduh [%g6 + AOFF_task_tss + AOFF_thread_ctx], %l0 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 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 lduh [%g6 + AOFF_task_tss + 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 lduh [%g6 + AOFF_task_tss + AOFF_thread_flags], %l5 andcc %l5, 0x200, %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 lduh [%g6 + AOFF_task_tss + 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_tss + 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+4 lduh [%g6 + AOFF_task_tss + AOFF_thread_ctx], %l0 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_tss + AOFF_thread_fpdepth] #undef PTREGS_OFF