1/* SPDX-License-Identifier: GPL-2.0 */ 2/* 3 * etrap.S: Preparing for entry into the kernel on Sparc V9. 4 * 5 * Copyright (C) 1996, 1997 David S. Miller (davem@caip.rutgers.edu) 6 * Copyright (C) 1997, 1998, 1999 Jakub Jelinek (jj@ultra.linux.cz) 7 */ 8 9 10#include <asm/asi.h> 11#include <asm/pstate.h> 12#include <asm/ptrace.h> 13#include <asm/page.h> 14#include <asm/spitfire.h> 15#include <asm/head.h> 16#include <asm/processor.h> 17#include <asm/mmu.h> 18 19#define TASK_REGOFF (THREAD_SIZE-TRACEREG_SZ-STACKFRAME_SZ) 20#define ETRAP_PSTATE1 (PSTATE_TSO | PSTATE_PRIV) 21#define ETRAP_PSTATE2 \ 22 (PSTATE_TSO | PSTATE_PEF | PSTATE_PRIV | PSTATE_IE) 23 24/* 25 * On entry, %g7 is return address - 0x4. 26 * %g4 and %g5 will be preserved %l4 and %l5 respectively. 27 */ 28 29 .text 30 .align 64 31 .globl etrap_syscall, etrap, etrap_irq, etraptl1 32etrap: rdpr %pil, %g2 33etrap_irq: clr %g3 34etrap_syscall: TRAP_LOAD_THREAD_REG(%g6, %g1) 35 rdpr %tstate, %g1 36 or %g1, %g3, %g1 37 sllx %g2, 20, %g3 38 andcc %g1, TSTATE_PRIV, %g0 39 or %g1, %g3, %g1 40 bne,pn %xcc, 1f 41 sub %sp, STACKFRAME_SZ+TRACEREG_SZ-STACK_BIAS, %g2 42661: wrpr %g0, 7, %cleanwin 43 .section .fast_win_ctrl_1insn_patch, "ax" 44 .word 661b 45 .word 0x85880000 ! allclean 46 .previous 47 48 sethi %hi(TASK_REGOFF), %g2 49 sethi %hi(TSTATE_PEF), %g3 50 or %g2, %lo(TASK_REGOFF), %g2 51 and %g1, %g3, %g3 52 brnz,pn %g3, 1f 53 add %g6, %g2, %g2 54 wr %g0, 0, %fprs 551: rdpr %tpc, %g3 56 57 stx %g1, [%g2 + STACKFRAME_SZ + PT_V9_TSTATE] 58 rdpr %tnpc, %g1 59 stx %g3, [%g2 + STACKFRAME_SZ + PT_V9_TPC] 60 rd %y, %g3 61 stx %g1, [%g2 + STACKFRAME_SZ + PT_V9_TNPC] 62 rdpr %tt, %g1 63 st %g3, [%g2 + STACKFRAME_SZ + PT_V9_Y] 64 sethi %hi(PT_REGS_MAGIC), %g3 65 or %g3, %g1, %g1 66 st %g1, [%g2 + STACKFRAME_SZ + PT_V9_MAGIC] 67 68 rdpr %cansave, %g1 69 brnz,pt %g1, etrap_save 70 nop 71 72 rdpr %cwp, %g1 73 add %g1, 2, %g1 74 wrpr %g1, %cwp 75 be,pt %xcc, etrap_user_spill 76 mov ASI_AIUP, %g3 77 78 rdpr %otherwin, %g3 79 brz %g3, etrap_kernel_spill 80 mov ASI_AIUS, %g3 81 82etrap_user_spill: 83 84 wr %g3, 0x0, %asi 85 ldx [%g6 + TI_FLAGS], %g3 86 and %g3, _TIF_32BIT, %g3 87 brnz,pt %g3, etrap_user_spill_32bit 88 nop 89 ba,a,pt %xcc, etrap_user_spill_64bit 90 91etrap_save: save %g2, -STACK_BIAS, %sp 92 mov %g6, %l6 93 94 bne,pn %xcc, 3f 95 mov PRIMARY_CONTEXT, %l4 96661: rdpr %canrestore, %g3 97 .section .fast_win_ctrl_1insn_patch, "ax" 98 .word 661b 99 nop 100 .previous 101 102 rdpr %wstate, %g2 103661: wrpr %g0, 0, %canrestore 104 .section .fast_win_ctrl_1insn_patch, "ax" 105 .word 661b 106 nop 107 .previous 108 sll %g2, 3, %g2 109 110 /* Set TI_SYS_FPDEPTH to 1 and clear TI_SYS_NOERROR. */ 111 mov 1, %l5 112 sth %l5, [%l6 + TI_SYS_NOERROR] 113 114661: wrpr %g3, 0, %otherwin 115 .section .fast_win_ctrl_1insn_patch, "ax" 116 .word 661b 117 .word 0x87880000 ! otherw 118 .previous 119 120 wrpr %g2, 0, %wstate 121 sethi %hi(sparc64_kern_pri_context), %g2 122 ldx [%g2 + %lo(sparc64_kern_pri_context)], %g3 123 124661: stxa %g3, [%l4] ASI_DMMU 125 .section .sun4v_1insn_patch, "ax" 126 .word 661b 127 stxa %g3, [%l4] ASI_MMU 128 .previous 129 130 sethi %hi(KERNBASE), %l4 131 flush %l4 132 mov ASI_AIUS, %l7 1332: mov %g4, %l4 134 mov %g5, %l5 135 add %g7, 4, %l2 136 137 /* Go to trap time globals so we can save them. */ 138661: wrpr %g0, ETRAP_PSTATE1, %pstate 139 .section .sun4v_1insn_patch, "ax" 140 .word 661b 141 SET_GL(0) 142 .previous 143 144 stx %g1, [%sp + PTREGS_OFF + PT_V9_G1] 145 stx %g2, [%sp + PTREGS_OFF + PT_V9_G2] 146 sllx %l7, 24, %l7 147 stx %g3, [%sp + PTREGS_OFF + PT_V9_G3] 148 rdpr %cwp, %l0 149 stx %g4, [%sp + PTREGS_OFF + PT_V9_G4] 150 stx %g5, [%sp + PTREGS_OFF + PT_V9_G5] 151 stx %g6, [%sp + PTREGS_OFF + PT_V9_G6] 152 stx %g7, [%sp + PTREGS_OFF + PT_V9_G7] 153 or %l7, %l0, %l7 154661: sethi %hi(TSTATE_TSO | TSTATE_PEF), %l0 155 /* If userspace is using ADI, it could potentially pass 156 * a pointer with version tag embedded in it. To maintain 157 * the ADI security, we must enable PSTATE.mcde. Userspace 158 * would have already set TTE.mcd in an earlier call to 159 * kernel and set the version tag for the address being 160 * dereferenced. Setting PSTATE.mcde would ensure any 161 * access to userspace data through a system call honors 162 * ADI and does not allow a rogue app to bypass ADI by 163 * using system calls. Setting PSTATE.mcde only affects 164 * accesses to virtual addresses that have TTE.mcd set. 165 * Set PMCDPER to ensure any exceptions caused by ADI 166 * version tag mismatch are exposed before system call 167 * returns to userspace. Setting PMCDPER affects only 168 * writes to virtual addresses that have TTE.mcd set and 169 * have a version tag set as well. 170 */ 171 .section .sun_m7_1insn_patch, "ax" 172 .word 661b 173 sethi %hi(TSTATE_TSO | TSTATE_PEF | TSTATE_MCDE), %l0 174 .previous 175661: nop 176 .section .sun_m7_1insn_patch, "ax" 177 .word 661b 178 .word 0xaf902001 /* wrpr %g0, 1, %pmcdper */ 179 .previous 180 or %l7, %l0, %l7 181 wrpr %l2, %tnpc 182 wrpr %l7, (TSTATE_PRIV | TSTATE_IE), %tstate 183 stx %i0, [%sp + PTREGS_OFF + PT_V9_I0] 184 stx %i1, [%sp + PTREGS_OFF + PT_V9_I1] 185 stx %i2, [%sp + PTREGS_OFF + PT_V9_I2] 186 stx %i3, [%sp + PTREGS_OFF + PT_V9_I3] 187 stx %i4, [%sp + PTREGS_OFF + PT_V9_I4] 188 stx %i5, [%sp + PTREGS_OFF + PT_V9_I5] 189 stx %i6, [%sp + PTREGS_OFF + PT_V9_I6] 190 mov %l6, %g6 191 stx %i7, [%sp + PTREGS_OFF + PT_V9_I7] 192 LOAD_PER_CPU_BASE(%g5, %g6, %g4, %g3, %l1) 193 ldx [%g6 + TI_TASK], %g4 194 done 195 1963: mov ASI_P, %l7 197 ldub [%l6 + TI_FPDEPTH], %l5 198 add %l6, TI_FPSAVED + 1, %l4 199 srl %l5, 1, %l3 200 add %l5, 2, %l5 201 202 /* Set TI_SYS_FPDEPTH to %l5 and clear TI_SYS_NOERROR. */ 203 sth %l5, [%l6 + TI_SYS_NOERROR] 204 ba,pt %xcc, 2b 205 stb %g0, [%l4 + %l3] 206 nop 207 208etraptl1: /* Save tstate/tpc/tnpc of TL 1-->4 and the tl register itself. 209 * We place this right after pt_regs on the trap stack. 210 * The layout is: 211 * 0x00 TL1's TSTATE 212 * 0x08 TL1's TPC 213 * 0x10 TL1's TNPC 214 * 0x18 TL1's TT 215 * ... 216 * 0x58 TL4's TT 217 * 0x60 TL 218 */ 219 TRAP_LOAD_THREAD_REG(%g6, %g1) 220 sub %sp, ((4 * 8) * 4) + 8, %g2 221 rdpr %tl, %g1 222 223 wrpr %g0, 1, %tl 224 rdpr %tstate, %g3 225 stx %g3, [%g2 + STACK_BIAS + 0x00] 226 rdpr %tpc, %g3 227 stx %g3, [%g2 + STACK_BIAS + 0x08] 228 rdpr %tnpc, %g3 229 stx %g3, [%g2 + STACK_BIAS + 0x10] 230 rdpr %tt, %g3 231 stx %g3, [%g2 + STACK_BIAS + 0x18] 232 233 wrpr %g0, 2, %tl 234 rdpr %tstate, %g3 235 stx %g3, [%g2 + STACK_BIAS + 0x20] 236 rdpr %tpc, %g3 237 stx %g3, [%g2 + STACK_BIAS + 0x28] 238 rdpr %tnpc, %g3 239 stx %g3, [%g2 + STACK_BIAS + 0x30] 240 rdpr %tt, %g3 241 stx %g3, [%g2 + STACK_BIAS + 0x38] 242 243 sethi %hi(is_sun4v), %g3 244 lduw [%g3 + %lo(is_sun4v)], %g3 245 brnz,pn %g3, finish_tl1_capture 246 nop 247 248 wrpr %g0, 3, %tl 249 rdpr %tstate, %g3 250 stx %g3, [%g2 + STACK_BIAS + 0x40] 251 rdpr %tpc, %g3 252 stx %g3, [%g2 + STACK_BIAS + 0x48] 253 rdpr %tnpc, %g3 254 stx %g3, [%g2 + STACK_BIAS + 0x50] 255 rdpr %tt, %g3 256 stx %g3, [%g2 + STACK_BIAS + 0x58] 257 258 wrpr %g0, 4, %tl 259 rdpr %tstate, %g3 260 stx %g3, [%g2 + STACK_BIAS + 0x60] 261 rdpr %tpc, %g3 262 stx %g3, [%g2 + STACK_BIAS + 0x68] 263 rdpr %tnpc, %g3 264 stx %g3, [%g2 + STACK_BIAS + 0x70] 265 rdpr %tt, %g3 266 stx %g3, [%g2 + STACK_BIAS + 0x78] 267 268 stx %g1, [%g2 + STACK_BIAS + 0x80] 269 270finish_tl1_capture: 271 wrpr %g0, 1, %tl 272661: nop 273 .section .sun4v_1insn_patch, "ax" 274 .word 661b 275 SET_GL(1) 276 .previous 277 278 rdpr %tstate, %g1 279 sub %g2, STACKFRAME_SZ + TRACEREG_SZ - STACK_BIAS, %g2 280 ba,pt %xcc, 1b 281 andcc %g1, TSTATE_PRIV, %g0 282 283#undef TASK_REGOFF 284#undef ETRAP_PSTATE1 285