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
157