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Diffstat (limited to '')
| -rw-r--r-- | arch/sparc/kernel/winfixup.S | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/arch/sparc/kernel/winfixup.S b/arch/sparc/kernel/winfixup.S new file mode 100644 index 000000000..448accee0 --- /dev/null +++ b/arch/sparc/kernel/winfixup.S @@ -0,0 +1,160 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* winfixup.S: Handle cases where user stack pointer is found to be bogus. + * + * Copyright (C) 1997, 2006 David S. Miller (davem@davemloft.net) + */ + +#include <asm/asi.h> +#include <asm/head.h> +#include <asm/page.h> +#include <asm/ptrace.h> +#include <asm/processor.h> +#include <asm/spitfire.h> +#include <asm/thread_info.h> + + .text + + /* It used to be the case that these register window fault + * handlers could run via the save and restore instructions + * done by the trap entry and exit code. They now do the + * window spill/fill by hand, so that case no longer can occur. + */ + + .align 32 +fill_fixup: + TRAP_LOAD_THREAD_REG(%g6, %g1) + rdpr %tstate, %g1 + and %g1, TSTATE_CWP, %g1 + or %g4, FAULT_CODE_WINFIXUP, %g4 + stb %g4, [%g6 + TI_FAULT_CODE] + stx %g5, [%g6 + TI_FAULT_ADDR] + wrpr %g1, %cwp + ba,pt %xcc, etrap + rd %pc, %g7 + call do_sparc64_fault + add %sp, PTREGS_OFF, %o0 + ba,a,pt %xcc, rtrap + + /* Be very careful about usage of the trap globals here. + * You cannot touch %g5 as that has the fault information. + */ +spill_fixup: +spill_fixup_mna: +spill_fixup_dax: + TRAP_LOAD_THREAD_REG(%g6, %g1) + ldx [%g6 + TI_FLAGS], %g1 + andcc %sp, 0x1, %g0 + movne %icc, 0, %g1 + andcc %g1, _TIF_32BIT, %g0 + ldub [%g6 + TI_WSAVED], %g1 + sll %g1, 3, %g3 + add %g6, %g3, %g3 + stx %sp, [%g3 + TI_RWIN_SPTRS] + sll %g1, 7, %g3 + bne,pt %xcc, 1f + add %g6, %g3, %g3 + stx %l0, [%g3 + TI_REG_WINDOW + 0x00] + stx %l1, [%g3 + TI_REG_WINDOW + 0x08] + stx %l2, [%g3 + TI_REG_WINDOW + 0x10] + stx %l3, [%g3 + TI_REG_WINDOW + 0x18] + stx %l4, [%g3 + TI_REG_WINDOW + 0x20] + stx %l5, [%g3 + TI_REG_WINDOW + 0x28] + stx %l6, [%g3 + TI_REG_WINDOW + 0x30] + stx %l7, [%g3 + TI_REG_WINDOW + 0x38] + stx %i0, [%g3 + TI_REG_WINDOW + 0x40] + stx %i1, [%g3 + TI_REG_WINDOW + 0x48] + stx %i2, [%g3 + TI_REG_WINDOW + 0x50] + stx %i3, [%g3 + TI_REG_WINDOW + 0x58] + stx %i4, [%g3 + TI_REG_WINDOW + 0x60] + stx %i5, [%g3 + TI_REG_WINDOW + 0x68] + stx %i6, [%g3 + TI_REG_WINDOW + 0x70] + ba,pt %xcc, 2f + stx %i7, [%g3 + TI_REG_WINDOW + 0x78] +1: stw %l0, [%g3 + TI_REG_WINDOW + 0x00] + stw %l1, [%g3 + TI_REG_WINDOW + 0x04] + stw %l2, [%g3 + TI_REG_WINDOW + 0x08] + stw %l3, [%g3 + TI_REG_WINDOW + 0x0c] + stw %l4, [%g3 + TI_REG_WINDOW + 0x10] + stw %l5, [%g3 + TI_REG_WINDOW + 0x14] + stw %l6, [%g3 + TI_REG_WINDOW + 0x18] + stw %l7, [%g3 + TI_REG_WINDOW + 0x1c] + stw %i0, [%g3 + TI_REG_WINDOW + 0x20] + stw %i1, [%g3 + TI_REG_WINDOW + 0x24] + stw %i2, [%g3 + TI_REG_WINDOW + 0x28] + stw %i3, [%g3 + TI_REG_WINDOW + 0x2c] + stw %i4, [%g3 + TI_REG_WINDOW + 0x30] + stw %i5, [%g3 + TI_REG_WINDOW + 0x34] + stw %i6, [%g3 + TI_REG_WINDOW + 0x38] + stw %i7, [%g3 + TI_REG_WINDOW + 0x3c] +2: add %g1, 1, %g1 + stb %g1, [%g6 + TI_WSAVED] + rdpr %tstate, %g1 + andcc %g1, TSTATE_PRIV, %g0 + saved + be,pn %xcc, 1f + and %g1, TSTATE_CWP, %g1 + retry +1: mov FAULT_CODE_WRITE | FAULT_CODE_DTLB | FAULT_CODE_WINFIXUP, %g4 + stb %g4, [%g6 + TI_FAULT_CODE] + stx %g5, [%g6 + TI_FAULT_ADDR] + wrpr %g1, %cwp + ba,pt %xcc, etrap + rd %pc, %g7 + call do_sparc64_fault + add %sp, PTREGS_OFF, %o0 + ba,a,pt %xcc, rtrap + +winfix_mna: + andn %g3, 0x7f, %g3 + add %g3, 0x78, %g3 + wrpr %g3, %tnpc + done + +fill_fixup_mna: + rdpr %tstate, %g1 + and %g1, TSTATE_CWP, %g1 + wrpr %g1, %cwp + ba,pt %xcc, etrap + rd %pc, %g7 + sethi %hi(tlb_type), %g1 + lduw [%g1 + %lo(tlb_type)], %g1 + cmp %g1, 3 + bne,pt %icc, 1f + add %sp, PTREGS_OFF, %o0 + mov %l4, %o2 + call sun4v_do_mna + mov %l5, %o1 + ba,a,pt %xcc, rtrap +1: mov %l4, %o1 + mov %l5, %o2 + call mem_address_unaligned + nop + ba,a,pt %xcc, rtrap + +winfix_dax: + andn %g3, 0x7f, %g3 + add %g3, 0x74, %g3 + wrpr %g3, %tnpc + done + +fill_fixup_dax: + rdpr %tstate, %g1 + and %g1, TSTATE_CWP, %g1 + wrpr %g1, %cwp + ba,pt %xcc, etrap + rd %pc, %g7 + sethi %hi(tlb_type), %g1 + mov %l4, %o1 + lduw [%g1 + %lo(tlb_type)], %g1 + mov %l5, %o2 + cmp %g1, 3 + bne,pt %icc, 1f + add %sp, PTREGS_OFF, %o0 + call sun4v_data_access_exception + nop + ba,a,pt %xcc, rtrap + nop +1: call spitfire_data_access_exception + nop + ba,a,pt %xcc, rtrap + nop |