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-rw-r--r--arch/sparc/kernel/winfixup.S160
1 files changed, 160 insertions, 0 deletions
diff --git a/arch/sparc/kernel/winfixup.S b/arch/sparc/kernel/winfixup.S
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+++ b/arch/sparc/kernel/winfixup.S
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+/* 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