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review.evervolv.com / android_kernel_oneplus_msm8996 / a40a1bafe7da0afe61b1c20fc50e18c07ce724f9 / . / arch / sparc / kernel / winfixup.S
blob: a6b0863c27df48e12bfa656a83783fee6ecfa05c [file] [log] [blame]
David S. Miller314ef682006-02-04 00:10:01 -0800[diff] [blame]1/* winfixup.S: Handle cases where user stack pointer is found to be bogus.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]2 *
David S. Miller314ef682006-02-04 00:10:01 -0800[diff] [blame]3 * Copyright (C) 1997, 2006 David S. Miller (davem@davemloft.net)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]4 */
5
6#include <asm/asi.h>
7#include <asm/head.h>
8#include <asm/page.h>
9#include <asm/ptrace.h>
10#include <asm/processor.h>
11#include <asm/spitfire.h>
12#include <asm/thread_info.h>
13
14 .text
15
David S. Miller314ef682006-02-04 00:10:01 -0800[diff] [blame]16 /* It used to be the case that these register window fault
17 * handlers could run via the save and restore instructions
18 * done by the trap entry and exit code. They now do the
19 * window spill/fill by hand, so that case no longer can occur.
20 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]21
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]22 .align 32
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]23fill_fixup:
David S. Millerffe483d2006-02-02 21:55:10 -0800[diff] [blame]24 TRAP_LOAD_THREAD_REG(%g6, %g1)
David S. Miller314ef682006-02-04 00:10:01 -0800[diff] [blame]25 rdpr %tstate, %g1
26 and %g1, TSTATE_CWP, %g1
27 or %g4, FAULT_CODE_WINFIXUP, %g4
28 stb %g4, [%g6 + TI_FAULT_CODE]
29 stx %g5, [%g6 + TI_FAULT_ADDR]
30 wrpr %g1, %cwp
31 ba,pt %xcc, etrap
32 rd %pc, %g7
33 call do_sparc64_fault
34 add %sp, PTREGS_OFF, %o0
David S. Miller7697daa2008-04-24 03:15:22 -0700[diff] [blame]35 ba,pt %xcc, rtrap
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]36 nop
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]37
David S. Miller314ef682006-02-04 00:10:01 -0800[diff] [blame]38 /* Be very careful about usage of the trap globals here.
39 * You cannot touch %g5 as that has the fault information.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]40 */
41spill_fixup:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]42spill_fixup_mna:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]43spill_fixup_dax:
David S. Millerffe483d2006-02-02 21:55:10 -0800[diff] [blame]44 TRAP_LOAD_THREAD_REG(%g6, %g1)
David S. Miller314ef682006-02-04 00:10:01 -0800[diff] [blame]45 ldx [%g6 + TI_FLAGS], %g1
46 andcc %g1, _TIF_32BIT, %g0
47 ldub [%g6 + TI_WSAVED], %g1
48 sll %g1, 3, %g3
49 add %g6, %g3, %g3
50 stx %sp, [%g3 + TI_RWIN_SPTRS]
51 sll %g1, 7, %g3
52 bne,pt %xcc, 1f
53 add %g6, %g3, %g3
54 stx %l0, [%g3 + TI_REG_WINDOW + 0x00]
55 stx %l1, [%g3 + TI_REG_WINDOW + 0x08]
56 stx %l2, [%g3 + TI_REG_WINDOW + 0x10]
57 stx %l3, [%g3 + TI_REG_WINDOW + 0x18]
58 stx %l4, [%g3 + TI_REG_WINDOW + 0x20]
59 stx %l5, [%g3 + TI_REG_WINDOW + 0x28]
60 stx %l6, [%g3 + TI_REG_WINDOW + 0x30]
61 stx %l7, [%g3 + TI_REG_WINDOW + 0x38]
62 stx %i0, [%g3 + TI_REG_WINDOW + 0x40]
63 stx %i1, [%g3 + TI_REG_WINDOW + 0x48]
64 stx %i2, [%g3 + TI_REG_WINDOW + 0x50]
65 stx %i3, [%g3 + TI_REG_WINDOW + 0x58]
66 stx %i4, [%g3 + TI_REG_WINDOW + 0x60]
67 stx %i5, [%g3 + TI_REG_WINDOW + 0x68]
68 stx %i6, [%g3 + TI_REG_WINDOW + 0x70]
69 ba,pt %xcc, 2f
70 stx %i7, [%g3 + TI_REG_WINDOW + 0x78]
711: stw %l0, [%g3 + TI_REG_WINDOW + 0x00]
72 stw %l1, [%g3 + TI_REG_WINDOW + 0x04]
73 stw %l2, [%g3 + TI_REG_WINDOW + 0x08]
74 stw %l3, [%g3 + TI_REG_WINDOW + 0x0c]
75 stw %l4, [%g3 + TI_REG_WINDOW + 0x10]
76 stw %l5, [%g3 + TI_REG_WINDOW + 0x14]
77 stw %l6, [%g3 + TI_REG_WINDOW + 0x18]
78 stw %l7, [%g3 + TI_REG_WINDOW + 0x1c]
79 stw %i0, [%g3 + TI_REG_WINDOW + 0x20]
80 stw %i1, [%g3 + TI_REG_WINDOW + 0x24]
81 stw %i2, [%g3 + TI_REG_WINDOW + 0x28]
82 stw %i3, [%g3 + TI_REG_WINDOW + 0x2c]
83 stw %i4, [%g3 + TI_REG_WINDOW + 0x30]
84 stw %i5, [%g3 + TI_REG_WINDOW + 0x34]
85 stw %i6, [%g3 + TI_REG_WINDOW + 0x38]
86 stw %i7, [%g3 + TI_REG_WINDOW + 0x3c]
872: add %g1, 1, %g1
88 stb %g1, [%g6 + TI_WSAVED]
89 rdpr %tstate, %g1
90 andcc %g1, TSTATE_PRIV, %g0
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]91 saved
David S. Miller314ef682006-02-04 00:10:01 -0800[diff] [blame]92 be,pn %xcc, 1f
93 and %g1, TSTATE_CWP, %g1
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]94 retry
David S. Miller314ef682006-02-04 00:10:01 -0800[diff] [blame]951: mov FAULT_CODE_WRITE | FAULT_CODE_DTLB | FAULT_CODE_WINFIXUP, %g4
96 stb %g4, [%g6 + TI_FAULT_CODE]
97 stx %g5, [%g6 + TI_FAULT_ADDR]
98 wrpr %g1, %cwp
99 ba,pt %xcc, etrap
100 rd %pc, %g7
101 call do_sparc64_fault
102 add %sp, PTREGS_OFF, %o0
David S. Miller7697daa2008-04-24 03:15:22 -0700[diff] [blame]103 ba,a,pt %xcc, rtrap
David S. Miller314ef682006-02-04 00:10:01 -0800[diff] [blame]104
105winfix_mna:
106 andn %g3, 0x7f, %g3
107 add %g3, 0x78, %g3
108 wrpr %g3, %tnpc
109 done
110
111fill_fixup_mna:
David S. Miller314ef682006-02-04 00:10:01 -0800[diff] [blame]112 rdpr %tstate, %g1
113 and %g1, TSTATE_CWP, %g1
114 wrpr %g1, %cwp
115 ba,pt %xcc, etrap
116 rd %pc, %g7
David S. Millered6b0b42006-02-09 20:20:34 -0800[diff] [blame]117 sethi %hi(tlb_type), %g1
David S. Millered6b0b42006-02-09 20:20:34 -0800[diff] [blame]118 lduw [%g1 + %lo(tlb_type)], %g1
David S. Millered6b0b42006-02-09 20:20:34 -0800[diff] [blame]119 cmp %g1, 3
120 bne,pt %icc, 1f
David S. Miller314ef682006-02-04 00:10:01 -0800[diff] [blame]121 add %sp, PTREGS_OFF, %o0
David S. Miller24c523ec2006-02-18 16:39:39 -0800[diff] [blame]122 mov %l4, %o2
David S. Miller9b6b4642006-02-16 01:45:49 -0800[diff] [blame]123 call sun4v_do_mna
David S. Miller24c523ec2006-02-18 16:39:39 -0800[diff] [blame]124 mov %l5, %o1
David S. Miller7697daa2008-04-24 03:15:22 -0700[diff] [blame]125 ba,a,pt %xcc, rtrap
David S. Miller24c523ec2006-02-18 16:39:39 -0800[diff] [blame]1261: mov %l4, %o1
127 mov %l5, %o2
128 call mem_address_unaligned
David S. Millered6b0b42006-02-09 20:20:34 -0800[diff] [blame]129 nop
David S. Miller7697daa2008-04-24 03:15:22 -0700[diff] [blame]130 ba,a,pt %xcc, rtrap
David S. Miller314ef682006-02-04 00:10:01 -0800[diff] [blame]131
132winfix_dax:
133 andn %g3, 0x7f, %g3
134 add %g3, 0x74, %g3
135 wrpr %g3, %tnpc
136 done
137
138fill_fixup_dax:
David S. Miller314ef682006-02-04 00:10:01 -0800[diff] [blame]139 rdpr %tstate, %g1
140 and %g1, TSTATE_CWP, %g1
141 wrpr %g1, %cwp
142 ba,pt %xcc, etrap
143 rd %pc, %g7
David S. Millered6b0b42006-02-09 20:20:34 -0800[diff] [blame]144 sethi %hi(tlb_type), %g1
David S. Miller314ef682006-02-04 00:10:01 -0800[diff] [blame]145 mov %l4, %o1
David S. Millered6b0b42006-02-09 20:20:34 -0800[diff] [blame]146 lduw [%g1 + %lo(tlb_type)], %g1
David S. Miller314ef682006-02-04 00:10:01 -0800[diff] [blame]147 mov %l5, %o2
David S. Millered6b0b42006-02-09 20:20:34 -0800[diff] [blame]148 cmp %g1, 3
149 bne,pt %icc, 1f
David S. Miller314ef682006-02-04 00:10:01 -0800[diff] [blame]150 add %sp, PTREGS_OFF, %o0
David S. Millered6b0b42006-02-09 20:20:34 -0800[diff] [blame]151 call sun4v_data_access_exception
152 nop
David S. Miller7697daa2008-04-24 03:15:22 -0700[diff] [blame]153 ba,a,pt %xcc, rtrap
David S. Millered6b0b42006-02-09 20:20:34 -0800[diff] [blame]1541: call spitfire_data_access_exception
155 nop
David S. Miller7697daa2008-04-24 03:15:22 -0700[diff] [blame]156 ba,a,pt %xcc, rtrap