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160 lines
3.9 KiB
160 lines
3.9 KiB
/* SPDX-License-Identifier: GPL-2.0 */
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/* winfixup.S: Handle cases where user stack pointer is found to be bogus.
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*
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* Copyright (C) 1997, 2006 David S. Miller (davem@davemloft.net)
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*/
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#include <asm/asi.h>
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#include <asm/head.h>
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#include <asm/page.h>
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#include <asm/ptrace.h>
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#include <asm/processor.h>
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#include <asm/spitfire.h>
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#include <asm/thread_info.h>
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.text
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/* It used to be the case that these register window fault
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* handlers could run via the save and restore instructions
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* done by the trap entry and exit code. They now do the
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* window spill/fill by hand, so that case no longer can occur.
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*/
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.align 32
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fill_fixup:
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TRAP_LOAD_THREAD_REG(%g6, %g1)
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rdpr %tstate, %g1
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and %g1, TSTATE_CWP, %g1
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or %g4, FAULT_CODE_WINFIXUP, %g4
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stb %g4, [%g6 + TI_FAULT_CODE]
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stx %g5, [%g6 + TI_FAULT_ADDR]
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wrpr %g1, %cwp
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ba,pt %xcc, etrap
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rd %pc, %g7
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call do_sparc64_fault
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add %sp, PTREGS_OFF, %o0
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ba,a,pt %xcc, rtrap
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/* Be very careful about usage of the trap globals here.
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* You cannot touch %g5 as that has the fault information.
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*/
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spill_fixup:
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spill_fixup_mna:
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spill_fixup_dax:
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TRAP_LOAD_THREAD_REG(%g6, %g1)
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ldx [%g6 + TI_FLAGS], %g1
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andcc %sp, 0x1, %g0
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movne %icc, 0, %g1
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andcc %g1, _TIF_32BIT, %g0
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ldub [%g6 + TI_WSAVED], %g1
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sll %g1, 3, %g3
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add %g6, %g3, %g3
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stx %sp, [%g3 + TI_RWIN_SPTRS]
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sll %g1, 7, %g3
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bne,pt %xcc, 1f
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add %g6, %g3, %g3
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stx %l0, [%g3 + TI_REG_WINDOW + 0x00]
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stx %l1, [%g3 + TI_REG_WINDOW + 0x08]
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stx %l2, [%g3 + TI_REG_WINDOW + 0x10]
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stx %l3, [%g3 + TI_REG_WINDOW + 0x18]
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stx %l4, [%g3 + TI_REG_WINDOW + 0x20]
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stx %l5, [%g3 + TI_REG_WINDOW + 0x28]
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stx %l6, [%g3 + TI_REG_WINDOW + 0x30]
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stx %l7, [%g3 + TI_REG_WINDOW + 0x38]
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stx %i0, [%g3 + TI_REG_WINDOW + 0x40]
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stx %i1, [%g3 + TI_REG_WINDOW + 0x48]
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stx %i2, [%g3 + TI_REG_WINDOW + 0x50]
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stx %i3, [%g3 + TI_REG_WINDOW + 0x58]
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stx %i4, [%g3 + TI_REG_WINDOW + 0x60]
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stx %i5, [%g3 + TI_REG_WINDOW + 0x68]
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stx %i6, [%g3 + TI_REG_WINDOW + 0x70]
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ba,pt %xcc, 2f
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stx %i7, [%g3 + TI_REG_WINDOW + 0x78]
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1: stw %l0, [%g3 + TI_REG_WINDOW + 0x00]
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stw %l1, [%g3 + TI_REG_WINDOW + 0x04]
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stw %l2, [%g3 + TI_REG_WINDOW + 0x08]
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stw %l3, [%g3 + TI_REG_WINDOW + 0x0c]
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stw %l4, [%g3 + TI_REG_WINDOW + 0x10]
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stw %l5, [%g3 + TI_REG_WINDOW + 0x14]
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stw %l6, [%g3 + TI_REG_WINDOW + 0x18]
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stw %l7, [%g3 + TI_REG_WINDOW + 0x1c]
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stw %i0, [%g3 + TI_REG_WINDOW + 0x20]
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stw %i1, [%g3 + TI_REG_WINDOW + 0x24]
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stw %i2, [%g3 + TI_REG_WINDOW + 0x28]
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stw %i3, [%g3 + TI_REG_WINDOW + 0x2c]
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stw %i4, [%g3 + TI_REG_WINDOW + 0x30]
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stw %i5, [%g3 + TI_REG_WINDOW + 0x34]
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stw %i6, [%g3 + TI_REG_WINDOW + 0x38]
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stw %i7, [%g3 + TI_REG_WINDOW + 0x3c]
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2: add %g1, 1, %g1
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stb %g1, [%g6 + TI_WSAVED]
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rdpr %tstate, %g1
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andcc %g1, TSTATE_PRIV, %g0
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saved
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be,pn %xcc, 1f
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and %g1, TSTATE_CWP, %g1
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retry
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1: mov FAULT_CODE_WRITE | FAULT_CODE_DTLB | FAULT_CODE_WINFIXUP, %g4
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stb %g4, [%g6 + TI_FAULT_CODE]
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stx %g5, [%g6 + TI_FAULT_ADDR]
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wrpr %g1, %cwp
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ba,pt %xcc, etrap
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rd %pc, %g7
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call do_sparc64_fault
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add %sp, PTREGS_OFF, %o0
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ba,a,pt %xcc, rtrap
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winfix_mna:
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andn %g3, 0x7f, %g3
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add %g3, 0x78, %g3
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wrpr %g3, %tnpc
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done
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fill_fixup_mna:
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rdpr %tstate, %g1
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and %g1, TSTATE_CWP, %g1
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wrpr %g1, %cwp
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ba,pt %xcc, etrap
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rd %pc, %g7
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sethi %hi(tlb_type), %g1
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lduw [%g1 + %lo(tlb_type)], %g1
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cmp %g1, 3
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bne,pt %icc, 1f
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add %sp, PTREGS_OFF, %o0
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mov %l4, %o2
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call sun4v_do_mna
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mov %l5, %o1
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ba,a,pt %xcc, rtrap
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1: mov %l4, %o1
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mov %l5, %o2
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call mem_address_unaligned
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nop
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ba,a,pt %xcc, rtrap
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winfix_dax:
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andn %g3, 0x7f, %g3
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add %g3, 0x74, %g3
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wrpr %g3, %tnpc
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done
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fill_fixup_dax:
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rdpr %tstate, %g1
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and %g1, TSTATE_CWP, %g1
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wrpr %g1, %cwp
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ba,pt %xcc, etrap
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rd %pc, %g7
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sethi %hi(tlb_type), %g1
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mov %l4, %o1
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lduw [%g1 + %lo(tlb_type)], %g1
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mov %l5, %o2
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cmp %g1, 3
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bne,pt %icc, 1f
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add %sp, PTREGS_OFF, %o0
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call sun4v_data_access_exception
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nop
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ba,a,pt %xcc, rtrap
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nop
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1: call spitfire_data_access_exception
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nop
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ba,a,pt %xcc, rtrap
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nop
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