| /* 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 |
