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_clr_l6 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 %g1, _TIF_32BIT, %g0 47 ldub [%g6 + TI_WSAVED], %g1 48 sll %g1, 3, %g3 49 add %g6, %g3, %g3 50 stx %sp, [%g3 + TI_RWIN_SPTRS] 51 sll %g1, 7, %g3 52 bne,pt %xcc, 1f 53 add %g6, %g3, %g3 54 stx %l0, [%g3 + TI_REG_WINDOW + 0x00] 55 stx %l1, [%g3 + TI_REG_WINDOW + 0x08] 56 stx %l2, [%g3 + TI_REG_WINDOW + 0x10] 57 stx %l3, [%g3 + TI_REG_WINDOW + 0x18] 58 stx %l4, [%g3 + TI_REG_WINDOW + 0x20] 59 stx %l5, [%g3 + TI_REG_WINDOW + 0x28] 60 stx %l6, [%g3 + TI_REG_WINDOW + 0x30] 61 stx %l7, [%g3 + TI_REG_WINDOW + 0x38] 62 stx %i0, [%g3 + TI_REG_WINDOW + 0x40] 63 stx %i1, [%g3 + TI_REG_WINDOW + 0x48] 64 stx %i2, [%g3 + TI_REG_WINDOW + 0x50] 65 stx %i3, [%g3 + TI_REG_WINDOW + 0x58] 66 stx %i4, [%g3 + TI_REG_WINDOW + 0x60] 67 stx %i5, [%g3 + TI_REG_WINDOW + 0x68] 68 stx %i6, [%g3 + TI_REG_WINDOW + 0x70] 69 ba,pt %xcc, 2f 70 stx %i7, [%g3 + TI_REG_WINDOW + 0x78] 711: stw %l0, [%g3 + TI_REG_WINDOW + 0x00] 72 stw %l1, [%g3 + TI_REG_WINDOW + 0x04] 73 stw %l2, [%g3 + TI_REG_WINDOW + 0x08] 74 stw %l3, [%g3 + TI_REG_WINDOW + 0x0c] 75 stw %l4, [%g3 + TI_REG_WINDOW + 0x10] 76 stw %l5, [%g3 + TI_REG_WINDOW + 0x14] 77 stw %l6, [%g3 + TI_REG_WINDOW + 0x18] 78 stw %l7, [%g3 + TI_REG_WINDOW + 0x1c] 79 stw %i0, [%g3 + TI_REG_WINDOW + 0x20] 80 stw %i1, [%g3 + TI_REG_WINDOW + 0x24] 81 stw %i2, [%g3 + TI_REG_WINDOW + 0x28] 82 stw %i3, [%g3 + TI_REG_WINDOW + 0x2c] 83 stw %i4, [%g3 + TI_REG_WINDOW + 0x30] 84 stw %i5, [%g3 + TI_REG_WINDOW + 0x34] 85 stw %i6, [%g3 + TI_REG_WINDOW + 0x38] 86 stw %i7, [%g3 + TI_REG_WINDOW + 0x3c] 872: add %g1, 1, %g1 88 stb %g1, [%g6 + TI_WSAVED] 89 rdpr %tstate, %g1 90 andcc %g1, TSTATE_PRIV, %g0 91 saved 92 be,pn %xcc, 1f 93 and %g1, TSTATE_CWP, %g1 94 retry 951: mov FAULT_CODE_WRITE | FAULT_CODE_DTLB | FAULT_CODE_WINFIXUP, %g4 96 stb %g4, [%g6 + TI_FAULT_CODE] 97 stx %g5, [%g6 + TI_FAULT_ADDR] 98 wrpr %g1, %cwp 99 ba,pt %xcc, etrap 100 rd %pc, %g7 101 call do_sparc64_fault 102 add %sp, PTREGS_OFF, %o0 103 ba,a,pt %xcc, rtrap_clr_l6 104 105winfix_mna: 106 andn %g3, 0x7f, %g3 107 add %g3, 0x78, %g3 108 wrpr %g3, %tnpc 109 done 110 111fill_fixup_mna: 112 rdpr %tstate, %g1 113 and %g1, TSTATE_CWP, %g1 114 wrpr %g1, %cwp 115 ba,pt %xcc, etrap 116 rd %pc, %g7 117 sethi %hi(tlb_type), %g1 118 lduw [%g1 + %lo(tlb_type)], %g1 119 cmp %g1, 3 120 bne,pt %icc, 1f 121 add %sp, PTREGS_OFF, %o0 122 mov %l4, %o2 123 call sun4v_do_mna 124 mov %l5, %o1 125 ba,a,pt %xcc, rtrap_clr_l6 1261: mov %l4, %o1 127 mov %l5, %o2 128 call mem_address_unaligned 129 nop 130 ba,a,pt %xcc, rtrap_clr_l6 131 132winfix_dax: 133 andn %g3, 0x7f, %g3 134 add %g3, 0x74, %g3 135 wrpr %g3, %tnpc 136 done 137 138fill_fixup_dax: 139 rdpr %tstate, %g1 140 and %g1, TSTATE_CWP, %g1 141 wrpr %g1, %cwp 142 ba,pt %xcc, etrap 143 rd %pc, %g7 144 sethi %hi(tlb_type), %g1 145 mov %l4, %o1 146 lduw [%g1 + %lo(tlb_type)], %g1 147 mov %l5, %o2 148 cmp %g1, 3 149 bne,pt %icc, 1f 150 add %sp, PTREGS_OFF, %o0 151 call sun4v_data_access_exception 152 nop 153 ba,a,pt %xcc, rtrap_clr_l6 1541: call spitfire_data_access_exception 155 nop 156 ba,a,pt %xcc, rtrap_clr_l6 157