1/* winfixup.S: Handle cases where user stack pointer is found to be bogus. 2 * 3 * Copyright (C) 1997, 2006 David S. Miller (davem@davemloft.net) 4 */ 5 6#include <asm/asi.h> 7#include <asm/head.h> 8#include <asm/page.h> 9#include <asm/ptrace.h> 10#include <asm/processor.h> 11#include <asm/spitfire.h> 12#include <asm/thread_info.h> 13 14 .text 15 16 /* It used to be the case that these register window fault 17 * handlers could run via the save and restore instructions 18 * done by the trap entry and exit code. They now do the 19 * window spill/fill by hand, so that case no longer can occur. 20 */ 21 22 .align 32 23fill_fixup: 24 TRAP_LOAD_THREAD_REG(%g6, %g1) 25 rdpr %tstate, %g1 26 and %g1, TSTATE_CWP, %g1 27 or %g4, FAULT_CODE_WINFIXUP, %g4 28 stb %g4, [%g6 + TI_FAULT_CODE] 29 stx %g5, [%g6 + TI_FAULT_ADDR] 30 wrpr %g1, %cwp 31 ba,pt %xcc, etrap 32 rd %pc, %g7 33 call do_sparc64_fault 34 add %sp, PTREGS_OFF, %o0 35 ba,pt %xcc, rtrap 36 nop 37 38 /* Be very careful about usage of the trap globals here. 39 * You cannot touch %g5 as that has the fault information. 40 */ 41spill_fixup: 42spill_fixup_mna: 43spill_fixup_dax: 44 TRAP_LOAD_THREAD_REG(%g6, %g1) 45 ldx [%g6 + TI_FLAGS], %g1 46 andcc %sp, 0x1, %g0 47 movne %icc, 0, %g1 48 andcc %g1, _TIF_32BIT, %g0 49 ldub [%g6 + TI_WSAVED], %g1 50 sll %g1, 3, %g3 51 add %g6, %g3, %g3 52 stx %sp, [%g3 + TI_RWIN_SPTRS] 53 sll %g1, 7, %g3 54 bne,pt %xcc, 1f 55 add %g6, %g3, %g3 56 stx %l0, [%g3 + TI_REG_WINDOW + 0x00] 57 stx %l1, [%g3 + TI_REG_WINDOW + 0x08] 58 stx %l2, [%g3 + TI_REG_WINDOW + 0x10] 59 stx %l3, [%g3 + TI_REG_WINDOW + 0x18] 60 stx %l4, [%g3 + TI_REG_WINDOW + 0x20] 61 stx %l5, [%g3 + TI_REG_WINDOW + 0x28] 62 stx %l6, [%g3 + TI_REG_WINDOW + 0x30] 63 stx %l7, [%g3 + TI_REG_WINDOW + 0x38] 64 stx %i0, [%g3 + TI_REG_WINDOW + 0x40] 65 stx %i1, [%g3 + TI_REG_WINDOW + 0x48] 66 stx %i2, [%g3 + TI_REG_WINDOW + 0x50] 67 stx %i3, [%g3 + TI_REG_WINDOW + 0x58] 68 stx %i4, [%g3 + TI_REG_WINDOW + 0x60] 69 stx %i5, [%g3 + TI_REG_WINDOW + 0x68] 70 stx %i6, [%g3 + TI_REG_WINDOW + 0x70] 71 ba,pt %xcc, 2f 72 stx %i7, [%g3 + TI_REG_WINDOW + 0x78] 731: stw %l0, [%g3 + TI_REG_WINDOW + 0x00] 74 stw %l1, [%g3 + TI_REG_WINDOW + 0x04] 75 stw %l2, [%g3 + TI_REG_WINDOW + 0x08] 76 stw %l3, [%g3 + TI_REG_WINDOW + 0x0c] 77 stw %l4, [%g3 + TI_REG_WINDOW + 0x10] 78 stw %l5, [%g3 + TI_REG_WINDOW + 0x14] 79 stw %l6, [%g3 + TI_REG_WINDOW + 0x18] 80 stw %l7, [%g3 + TI_REG_WINDOW + 0x1c] 81 stw %i0, [%g3 + TI_REG_WINDOW + 0x20] 82 stw %i1, [%g3 + TI_REG_WINDOW + 0x24] 83 stw %i2, [%g3 + TI_REG_WINDOW + 0x28] 84 stw %i3, [%g3 + TI_REG_WINDOW + 0x2c] 85 stw %i4, [%g3 + TI_REG_WINDOW + 0x30] 86 stw %i5, [%g3 + TI_REG_WINDOW + 0x34] 87 stw %i6, [%g3 + TI_REG_WINDOW + 0x38] 88 stw %i7, [%g3 + TI_REG_WINDOW + 0x3c] 892: add %g1, 1, %g1 90 stb %g1, [%g6 + TI_WSAVED] 91 rdpr %tstate, %g1 92 andcc %g1, TSTATE_PRIV, %g0 93 saved 94 be,pn %xcc, 1f 95 and %g1, TSTATE_CWP, %g1 96 retry 971: mov FAULT_CODE_WRITE | FAULT_CODE_DTLB | FAULT_CODE_WINFIXUP, %g4 98 stb %g4, [%g6 + TI_FAULT_CODE] 99 stx %g5, [%g6 + TI_FAULT_ADDR] 100 wrpr %g1, %cwp 101 ba,pt %xcc, etrap 102 rd %pc, %g7 103 call do_sparc64_fault 104 add %sp, PTREGS_OFF, %o0 105 ba,a,pt %xcc, rtrap 106 107winfix_mna: 108 andn %g3, 0x7f, %g3 109 add %g3, 0x78, %g3 110 wrpr %g3, %tnpc 111 done 112 113fill_fixup_mna: 114 rdpr %tstate, %g1 115 and %g1, TSTATE_CWP, %g1 116 wrpr %g1, %cwp 117 ba,pt %xcc, etrap 118 rd %pc, %g7 119 sethi %hi(tlb_type), %g1 120 lduw [%g1 + %lo(tlb_type)], %g1 121 cmp %g1, 3 122 bne,pt %icc, 1f 123 add %sp, PTREGS_OFF, %o0 124 mov %l4, %o2 125 call sun4v_do_mna 126 mov %l5, %o1 127 ba,a,pt %xcc, rtrap 1281: mov %l4, %o1 129 mov %l5, %o2 130 call mem_address_unaligned 131 nop 132 ba,a,pt %xcc, rtrap 133 134winfix_dax: 135 andn %g3, 0x7f, %g3 136 add %g3, 0x74, %g3 137 wrpr %g3, %tnpc 138 done 139 140fill_fixup_dax: 141 rdpr %tstate, %g1 142 and %g1, TSTATE_CWP, %g1 143 wrpr %g1, %cwp 144 ba,pt %xcc, etrap 145 rd %pc, %g7 146 sethi %hi(tlb_type), %g1 147 mov %l4, %o1 148 lduw [%g1 + %lo(tlb_type)], %g1 149 mov %l5, %o2 150 cmp %g1, 3 151 bne,pt %icc, 1f 152 add %sp, PTREGS_OFF, %o0 153 call sun4v_data_access_exception 154 nop 155 ba,a,pt %xcc, rtrap 1561: call spitfire_data_access_exception 157 nop 158 ba,a,pt %xcc, rtrap 159