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1/* winfixup.S: Handle cases where user stack pointer is found to be bogus.
2 *
3 * Copyright (C) 1997, 2006 David S. Miller (davem@davemloft.net)
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
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 */
21
22 .align 32
23fill_fixup:
24 TRAP_LOAD_THREAD_REG(%g6, %g1)
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
35 ba,pt %xcc, rtrap
36 nop
37
38 /* Be very careful about usage of the trap globals here.
39 * You cannot touch %g5 as that has the fault information.
40 */
41spill_fixup:
42spill_fixup_mna:
43spill_fixup_dax:
44 TRAP_LOAD_THREAD_REG(%g6, %g1)
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
91 saved
92 be,pn %xcc, 1f
93 and %g1, TSTATE_CWP, %g1
94 retry
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
103 ba,a,pt %xcc, rtrap
104
105winfix_mna:
106 andn %g3, 0x7f, %g3
107 add %g3, 0x78, %g3
108 wrpr %g3, %tnpc
109 done
110
111fill_fixup_mna:
112 rdpr %tstate, %g1
113 and %g1, TSTATE_CWP, %g1
114 wrpr %g1, %cwp
115 ba,pt %xcc, etrap
116 rd %pc, %g7
117 sethi %hi(tlb_type), %g1
118 lduw [%g1 + %lo(tlb_type)], %g1
119 cmp %g1, 3
120 bne,pt %icc, 1f
121 add %sp, PTREGS_OFF, %o0
122 mov %l4, %o2
123 call sun4v_do_mna
124 mov %l5, %o1
125 ba,a,pt %xcc, rtrap
1261: mov %l4, %o1
127 mov %l5, %o2
128 call mem_address_unaligned
129 nop
130 ba,a,pt %xcc, rtrap
131
132winfix_dax:
133 andn %g3, 0x7f, %g3
134 add %g3, 0x74, %g3
135 wrpr %g3, %tnpc
136 done
137
138fill_fixup_dax:
139 rdpr %tstate, %g1
140 and %g1, TSTATE_CWP, %g1
141 wrpr %g1, %cwp
142 ba,pt %xcc, etrap
143 rd %pc, %g7
144 sethi %hi(tlb_type), %g1
145 mov %l4, %o1
146 lduw [%g1 + %lo(tlb_type)], %g1
147 mov %l5, %o2
148 cmp %g1, 3
149 bne,pt %icc, 1f
150 add %sp, PTREGS_OFF, %o0
151 call sun4v_data_access_exception
152 nop
153 ba,a,pt %xcc, rtrap
1541: call spitfire_data_access_exception
155 nop
156 ba,a,pt %xcc, rtrap
1/* winfixup.S: Handle cases where user stack pointer is found to be bogus.
2 *
3 * Copyright (C) 1997, 2006 David S. Miller (davem@davemloft.net)
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
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 */
21
22 .align 32
23fill_fixup:
24 TRAP_LOAD_THREAD_REG(%g6, %g1)
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
35 ba,a,pt %xcc, rtrap
36
37 /* Be very careful about usage of the trap globals here.
38 * You cannot touch %g5 as that has the fault information.
39 */
40spill_fixup:
41spill_fixup_mna:
42spill_fixup_dax:
43 TRAP_LOAD_THREAD_REG(%g6, %g1)
44 ldx [%g6 + TI_FLAGS], %g1
45 andcc %sp, 0x1, %g0
46 movne %icc, 0, %g1
47 andcc %g1, _TIF_32BIT, %g0
48 ldub [%g6 + TI_WSAVED], %g1
49 sll %g1, 3, %g3
50 add %g6, %g3, %g3
51 stx %sp, [%g3 + TI_RWIN_SPTRS]
52 sll %g1, 7, %g3
53 bne,pt %xcc, 1f
54 add %g6, %g3, %g3
55 stx %l0, [%g3 + TI_REG_WINDOW + 0x00]
56 stx %l1, [%g3 + TI_REG_WINDOW + 0x08]
57 stx %l2, [%g3 + TI_REG_WINDOW + 0x10]
58 stx %l3, [%g3 + TI_REG_WINDOW + 0x18]
59 stx %l4, [%g3 + TI_REG_WINDOW + 0x20]
60 stx %l5, [%g3 + TI_REG_WINDOW + 0x28]
61 stx %l6, [%g3 + TI_REG_WINDOW + 0x30]
62 stx %l7, [%g3 + TI_REG_WINDOW + 0x38]
63 stx %i0, [%g3 + TI_REG_WINDOW + 0x40]
64 stx %i1, [%g3 + TI_REG_WINDOW + 0x48]
65 stx %i2, [%g3 + TI_REG_WINDOW + 0x50]
66 stx %i3, [%g3 + TI_REG_WINDOW + 0x58]
67 stx %i4, [%g3 + TI_REG_WINDOW + 0x60]
68 stx %i5, [%g3 + TI_REG_WINDOW + 0x68]
69 stx %i6, [%g3 + TI_REG_WINDOW + 0x70]
70 ba,pt %xcc, 2f
71 stx %i7, [%g3 + TI_REG_WINDOW + 0x78]
721: stw %l0, [%g3 + TI_REG_WINDOW + 0x00]
73 stw %l1, [%g3 + TI_REG_WINDOW + 0x04]
74 stw %l2, [%g3 + TI_REG_WINDOW + 0x08]
75 stw %l3, [%g3 + TI_REG_WINDOW + 0x0c]
76 stw %l4, [%g3 + TI_REG_WINDOW + 0x10]
77 stw %l5, [%g3 + TI_REG_WINDOW + 0x14]
78 stw %l6, [%g3 + TI_REG_WINDOW + 0x18]
79 stw %l7, [%g3 + TI_REG_WINDOW + 0x1c]
80 stw %i0, [%g3 + TI_REG_WINDOW + 0x20]
81 stw %i1, [%g3 + TI_REG_WINDOW + 0x24]
82 stw %i2, [%g3 + TI_REG_WINDOW + 0x28]
83 stw %i3, [%g3 + TI_REG_WINDOW + 0x2c]
84 stw %i4, [%g3 + TI_REG_WINDOW + 0x30]
85 stw %i5, [%g3 + TI_REG_WINDOW + 0x34]
86 stw %i6, [%g3 + TI_REG_WINDOW + 0x38]
87 stw %i7, [%g3 + TI_REG_WINDOW + 0x3c]
882: add %g1, 1, %g1
89 stb %g1, [%g6 + TI_WSAVED]
90 rdpr %tstate, %g1
91 andcc %g1, TSTATE_PRIV, %g0
92 saved
93 be,pn %xcc, 1f
94 and %g1, TSTATE_CWP, %g1
95 retry
961: mov FAULT_CODE_WRITE | FAULT_CODE_DTLB | FAULT_CODE_WINFIXUP, %g4
97 stb %g4, [%g6 + TI_FAULT_CODE]
98 stx %g5, [%g6 + TI_FAULT_ADDR]
99 wrpr %g1, %cwp
100 ba,pt %xcc, etrap
101 rd %pc, %g7
102 call do_sparc64_fault
103 add %sp, PTREGS_OFF, %o0
104 ba,a,pt %xcc, rtrap
105
106winfix_mna:
107 andn %g3, 0x7f, %g3
108 add %g3, 0x78, %g3
109 wrpr %g3, %tnpc
110 done
111
112fill_fixup_mna:
113 rdpr %tstate, %g1
114 and %g1, TSTATE_CWP, %g1
115 wrpr %g1, %cwp
116 ba,pt %xcc, etrap
117 rd %pc, %g7
118 sethi %hi(tlb_type), %g1
119 lduw [%g1 + %lo(tlb_type)], %g1
120 cmp %g1, 3
121 bne,pt %icc, 1f
122 add %sp, PTREGS_OFF, %o0
123 mov %l4, %o2
124 call sun4v_do_mna
125 mov %l5, %o1
126 ba,a,pt %xcc, rtrap
1271: mov %l4, %o1
128 mov %l5, %o2
129 call mem_address_unaligned
130 nop
131 ba,a,pt %xcc, rtrap
132
133winfix_dax:
134 andn %g3, 0x7f, %g3
135 add %g3, 0x74, %g3
136 wrpr %g3, %tnpc
137 done
138
139fill_fixup_dax:
140 rdpr %tstate, %g1
141 and %g1, TSTATE_CWP, %g1
142 wrpr %g1, %cwp
143 ba,pt %xcc, etrap
144 rd %pc, %g7
145 sethi %hi(tlb_type), %g1
146 mov %l4, %o1
147 lduw [%g1 + %lo(tlb_type)], %g1
148 mov %l5, %o2
149 cmp %g1, 3
150 bne,pt %icc, 1f
151 add %sp, PTREGS_OFF, %o0
152 call sun4v_data_access_exception
153 nop
154 ba,a,pt %xcc, rtrap
1551: call spitfire_data_access_exception
156 nop
157 ba,a,pt %xcc, rtrap