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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 | /* $Id: rtrap.S,v 1.45 1998/11/09 15:33:29 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 <asm/asi.h> #include <asm/pstate.h> #include <asm/ptrace.h> #include <asm/spitfire.h> #include <asm/head.h> #include <asm/visasm.h> #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 stxa %l0, [%l7 + %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 |