/* SPDX-License-Identifier: GPL-2.0 */ /* * etrap.S: Preparing for entry into the kernel on Sparc V9. * * Copyright (C) 1996, 1997 David S. Miller (davem@caip.rutgers.edu) * Copyright (C) 1997, 1998, 1999 Jakub Jelinek (jj@ultra.linux.cz) */ #include <asm/asi.h> #include <asm/pstate.h> #include <asm/ptrace.h> #include <asm/page.h> #include <asm/spitfire.h> #include <asm/head.h> #include <asm/processor.h> #include <asm/mmu.h> #define TASK_REGOFF (THREAD_SIZE-TRACEREG_SZ-STACKFRAME_SZ) #define ETRAP_PSTATE1 (PSTATE_TSO | PSTATE_PRIV) #define ETRAP_PSTATE2 \ (PSTATE_TSO | PSTATE_PEF | PSTATE_PRIV | PSTATE_IE) /* * On entry, %g7 is return address - 0x4. * %g4 and %g5 will be preserved %l4 and %l5 respectively. */ .text .align 64 .globl etrap_syscall, etrap, etrap_irq, etraptl1 etrap: rdpr %pil, %g2 etrap_irq: clr %g3 etrap_syscall: TRAP_LOAD_THREAD_REG(%g6, %g1) rdpr %tstate, %g1 or %g1, %g3, %g1 sllx %g2, 20, %g3 andcc %g1, TSTATE_PRIV, %g0 or %g1, %g3, %g1 bne,pn %xcc, 1f sub %sp, STACKFRAME_SZ+TRACEREG_SZ-STACK_BIAS, %g2 661: wrpr %g0, 7, %cleanwin .section .fast_win_ctrl_1insn_patch, "ax" .word 661b .word 0x85880000 ! allclean .previous sethi %hi(TASK_REGOFF), %g2 sethi %hi(TSTATE_PEF), %g3 or %g2, %lo(TASK_REGOFF), %g2 and %g1, %g3, %g3 brnz,pn %g3, 1f add %g6, %g2, %g2 wr %g0, 0, %fprs 1: rdpr %tpc, %g3 stx %g1, [%g2 + STACKFRAME_SZ + PT_V9_TSTATE] rdpr %tnpc, %g1 stx %g3, [%g2 + STACKFRAME_SZ + PT_V9_TPC] rd %y, %g3 stx %g1, [%g2 + STACKFRAME_SZ + PT_V9_TNPC] rdpr %tt, %g1 st %g3, [%g2 + STACKFRAME_SZ + PT_V9_Y] sethi %hi(PT_REGS_MAGIC), %g3 or %g3, %g1, %g1 st %g1, [%g2 + STACKFRAME_SZ + PT_V9_MAGIC] rdpr %cansave, %g1 brnz,pt %g1, etrap_save nop rdpr %cwp, %g1 add %g1, 2, %g1 wrpr %g1, %cwp be,pt %xcc, etrap_user_spill mov ASI_AIUP, %g3 rdpr %otherwin, %g3 brz %g3, etrap_kernel_spill mov ASI_AIUS, %g3 etrap_user_spill: wr %g3, 0x0, %asi ldx [%g6 + TI_FLAGS], %g3 and %g3, _TIF_32BIT, %g3 brnz,pt %g3, etrap_user_spill_32bit nop ba,a,pt %xcc, etrap_user_spill_64bit etrap_save: save %g2, -STACK_BIAS, %sp mov %g6, %l6 bne,pn %xcc, 3f mov PRIMARY_CONTEXT, %l4 661: rdpr %canrestore, %g3 .section .fast_win_ctrl_1insn_patch, "ax" .word 661b nop .previous rdpr %wstate, %g2 661: wrpr %g0, 0, %canrestore .section .fast_win_ctrl_1insn_patch, "ax" .word 661b nop .previous sll %g2, 3, %g2 /* Set TI_SYS_FPDEPTH to 1 and clear TI_SYS_NOERROR. */ mov 1, %l5 sth %l5, [%l6 + TI_SYS_NOERROR] 661: wrpr %g3, 0, %otherwin .section .fast_win_ctrl_1insn_patch, "ax" .word 661b .word 0x87880000 ! otherw .previous wrpr %g2, 0, %wstate sethi %hi(sparc64_kern_pri_context), %g2 ldx [%g2 + %lo(sparc64_kern_pri_context)], %g3 661: stxa %g3, [%l4] ASI_DMMU .section .sun4v_1insn_patch, "ax" .word 661b stxa %g3, [%l4] ASI_MMU .previous sethi %hi(KERNBASE), %l4 flush %l4 mov ASI_AIUS, %l7 2: mov %g4, %l4 mov %g5, %l5 add %g7, 4, %l2 /* Go to trap time globals so we can save them. */ 661: wrpr %g0, ETRAP_PSTATE1, %pstate .section .sun4v_1insn_patch, "ax" .word 661b SET_GL(0) .previous stx %g1, [%sp + PTREGS_OFF + PT_V9_G1] stx %g2, [%sp + PTREGS_OFF + PT_V9_G2] sllx %l7, 24, %l7 stx %g3, [%sp + PTREGS_OFF + PT_V9_G3] rdpr %cwp, %l0 stx %g4, [%sp + PTREGS_OFF + PT_V9_G4] stx %g5, [%sp + PTREGS_OFF + PT_V9_G5] stx %g6, [%sp + PTREGS_OFF + PT_V9_G6] stx %g7, [%sp + PTREGS_OFF + PT_V9_G7] or %l7, %l0, %l7 661: sethi %hi(TSTATE_TSO | TSTATE_PEF), %l0 /* If userspace is using ADI, it could potentially pass * a pointer with version tag embedded in it. To maintain * the ADI security, we must enable PSTATE.mcde. Userspace * would have already set TTE.mcd in an earlier call to * kernel and set the version tag for the address being * dereferenced. Setting PSTATE.mcde would ensure any * access to userspace data through a system call honors * ADI and does not allow a rogue app to bypass ADI by * using system calls. Setting PSTATE.mcde only affects * accesses to virtual addresses that have TTE.mcd set. * Set PMCDPER to ensure any exceptions caused by ADI * version tag mismatch are exposed before system call * returns to userspace. Setting PMCDPER affects only * writes to virtual addresses that have TTE.mcd set and * have a version tag set as well. */ .section .sun_m7_1insn_patch, "ax" .word 661b sethi %hi(TSTATE_TSO | TSTATE_PEF | TSTATE_MCDE), %l0 .previous 661: nop .section .sun_m7_1insn_patch, "ax" .word 661b .word 0xaf902001 /* wrpr %g0, 1, %pmcdper */ .previous or %l7, %l0, %l7 wrpr %l2, %tnpc wrpr %l7, (TSTATE_PRIV | TSTATE_IE), %tstate stx %i0, [%sp + PTREGS_OFF + PT_V9_I0] stx %i1, [%sp + PTREGS_OFF + PT_V9_I1] stx %i2, [%sp + PTREGS_OFF + PT_V9_I2] stx %i3, [%sp + PTREGS_OFF + PT_V9_I3] stx %i4, [%sp + PTREGS_OFF + PT_V9_I4] stx %i5, [%sp + PTREGS_OFF + PT_V9_I5] stx %i6, [%sp + PTREGS_OFF + PT_V9_I6] mov %l6, %g6 stx %i7, [%sp + PTREGS_OFF + PT_V9_I7] LOAD_PER_CPU_BASE(%g5, %g6, %g4, %g3, %l1) ldx [%g6 + TI_TASK], %g4 done 3: mov ASI_P, %l7 ldub [%l6 + TI_FPDEPTH], %l5 add %l6, TI_FPSAVED + 1, %l4 srl %l5, 1, %l3 add %l5, 2, %l5 /* Set TI_SYS_FPDEPTH to %l5 and clear TI_SYS_NOERROR. */ sth %l5, [%l6 + TI_SYS_NOERROR] ba,pt %xcc, 2b stb %g0, [%l4 + %l3] nop etraptl1: /* Save tstate/tpc/tnpc of TL 1-->4 and the tl register itself. * We place this right after pt_regs on the trap stack. * The layout is: * 0x00 TL1's TSTATE * 0x08 TL1's TPC * 0x10 TL1's TNPC * 0x18 TL1's TT * ... * 0x58 TL4's TT * 0x60 TL */ TRAP_LOAD_THREAD_REG(%g6, %g1) sub %sp, ((4 * 8) * 4) + 8, %g2 rdpr %tl, %g1 wrpr %g0, 1, %tl rdpr %tstate, %g3 stx %g3, [%g2 + STACK_BIAS + 0x00] rdpr %tpc, %g3 stx %g3, [%g2 + STACK_BIAS + 0x08] rdpr %tnpc, %g3 stx %g3, [%g2 + STACK_BIAS + 0x10] rdpr %tt, %g3 stx %g3, [%g2 + STACK_BIAS + 0x18] wrpr %g0, 2, %tl rdpr %tstate, %g3 stx %g3, [%g2 + STACK_BIAS + 0x20] rdpr %tpc, %g3 stx %g3, [%g2 + STACK_BIAS + 0x28] rdpr %tnpc, %g3 stx %g3, [%g2 + STACK_BIAS + 0x30] rdpr %tt, %g3 stx %g3, [%g2 + STACK_BIAS + 0x38] sethi %hi(is_sun4v), %g3 lduw [%g3 + %lo(is_sun4v)], %g3 brnz,pn %g3, finish_tl1_capture nop wrpr %g0, 3, %tl rdpr %tstate, %g3 stx %g3, [%g2 + STACK_BIAS + 0x40] rdpr %tpc, %g3 stx %g3, [%g2 + STACK_BIAS + 0x48] rdpr %tnpc, %g3 stx %g3, [%g2 + STACK_BIAS + 0x50] rdpr %tt, %g3 stx %g3, [%g2 + STACK_BIAS + 0x58] wrpr %g0, 4, %tl rdpr %tstate, %g3 stx %g3, [%g2 + STACK_BIAS + 0x60] rdpr %tpc, %g3 stx %g3, [%g2 + STACK_BIAS + 0x68] rdpr %tnpc, %g3 stx %g3, [%g2 + STACK_BIAS + 0x70] rdpr %tt, %g3 stx %g3, [%g2 + STACK_BIAS + 0x78] stx %g1, [%g2 + STACK_BIAS + 0x80] finish_tl1_capture: wrpr %g0, 1, %tl 661: nop .section .sun4v_1insn_patch, "ax" .word 661b SET_GL(1) .previous rdpr %tstate, %g1 sub %g2, STACKFRAME_SZ + TRACEREG_SZ - STACK_BIAS, %g2 ba,pt %xcc, 1b andcc %g1, TSTATE_PRIV, %g0 #undef TASK_REGOFF #undef ETRAP_PSTATE1