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