Root/arch/sparc/kernel/etrap_64.S

1/*
2 * etrap.S: Preparing for entry into the kernel on Sparc V9.
3 *
4 * Copyright (C) 1996, 1997 David S. Miller (davem@caip.rutgers.edu)
5 * Copyright (C) 1997, 1998, 1999 Jakub Jelinek (jj@ultra.linux.cz)
6 */
7
8
9#include <asm/asi.h>
10#include <asm/pstate.h>
11#include <asm/ptrace.h>
12#include <asm/page.h>
13#include <asm/spitfire.h>
14#include <asm/head.h>
15#include <asm/processor.h>
16#include <asm/mmu.h>
17
18#define TASK_REGOFF (THREAD_SIZE-TRACEREG_SZ-STACKFRAME_SZ)
19#define ETRAP_PSTATE1 (PSTATE_TSO | PSTATE_PRIV)
20#define ETRAP_PSTATE2 \
21        (PSTATE_TSO | PSTATE_PEF | PSTATE_PRIV | PSTATE_IE)
22
23/*
24 * On entry, %g7 is return address - 0x4.
25 * %g4 and %g5 will be preserved %l4 and %l5 respectively.
26 */
27
28        .text
29        .align 64
30        .globl etrap_syscall, etrap, etrap_irq, etraptl1
31etrap: rdpr %pil, %g2
32etrap_irq: clr %g3
33etrap_syscall: TRAP_LOAD_THREAD_REG(%g6, %g1)
34        rdpr %tstate, %g1
35        or %g1, %g3, %g1
36        sllx %g2, 20, %g3
37        andcc %g1, TSTATE_PRIV, %g0
38        or %g1, %g3, %g1
39        bne,pn %xcc, 1f
40         sub %sp, STACKFRAME_SZ+TRACEREG_SZ-STACK_BIAS, %g2
41        wrpr %g0, 7, %cleanwin
42
43        sethi %hi(TASK_REGOFF), %g2
44        sethi %hi(TSTATE_PEF), %g3
45        or %g2, %lo(TASK_REGOFF), %g2
46        and %g1, %g3, %g3
47        brnz,pn %g3, 1f
48         add %g6, %g2, %g2
49        wr %g0, 0, %fprs
501: rdpr %tpc, %g3
51
52        stx %g1, [%g2 + STACKFRAME_SZ + PT_V9_TSTATE]
53        rdpr %tnpc, %g1
54        stx %g3, [%g2 + STACKFRAME_SZ + PT_V9_TPC]
55        rd %y, %g3
56        stx %g1, [%g2 + STACKFRAME_SZ + PT_V9_TNPC]
57        rdpr %tt, %g1
58        st %g3, [%g2 + STACKFRAME_SZ + PT_V9_Y]
59        sethi %hi(PT_REGS_MAGIC), %g3
60        or %g3, %g1, %g1
61        st %g1, [%g2 + STACKFRAME_SZ + PT_V9_MAGIC]
62
63        rdpr %cansave, %g1
64        brnz,pt %g1, etrap_save
65         nop
66
67        rdpr %cwp, %g1
68        add %g1, 2, %g1
69        wrpr %g1, %cwp
70        be,pt %xcc, etrap_user_spill
71         mov ASI_AIUP, %g3
72
73        rdpr %otherwin, %g3
74        brz %g3, etrap_kernel_spill
75         mov ASI_AIUS, %g3
76
77etrap_user_spill:
78
79        wr %g3, 0x0, %asi
80        ldx [%g6 + TI_FLAGS], %g3
81        and %g3, _TIF_32BIT, %g3
82        brnz,pt %g3, etrap_user_spill_32bit
83         nop
84        ba,a,pt %xcc, etrap_user_spill_64bit
85
86etrap_save: save %g2, -STACK_BIAS, %sp
87        mov %g6, %l6
88
89        bne,pn %xcc, 3f
90         mov PRIMARY_CONTEXT, %l4
91        rdpr %canrestore, %g3
92        rdpr %wstate, %g2
93        wrpr %g0, 0, %canrestore
94        sll %g2, 3, %g2
95        mov 1, %l5
96        stb %l5, [%l6 + TI_FPDEPTH]
97
98        wrpr %g3, 0, %otherwin
99        wrpr %g2, 0, %wstate
100        sethi %hi(sparc64_kern_pri_context), %g2
101        ldx [%g2 + %lo(sparc64_kern_pri_context)], %g3
102
103661: stxa %g3, [%l4] ASI_DMMU
104        .section .sun4v_1insn_patch, "ax"
105        .word 661b
106        stxa %g3, [%l4] ASI_MMU
107        .previous
108
109        sethi %hi(KERNBASE), %l4
110        flush %l4
111        mov ASI_AIUS, %l7
1122: mov %g4, %l4
113        mov %g5, %l5
114        add %g7, 4, %l2
115
116        /* Go to trap time globals so we can save them. */
117661: wrpr %g0, ETRAP_PSTATE1, %pstate
118        .section .sun4v_1insn_patch, "ax"
119        .word 661b
120        SET_GL(0)
121        .previous
122
123        stx %g1, [%sp + PTREGS_OFF + PT_V9_G1]
124        stx %g2, [%sp + PTREGS_OFF + PT_V9_G2]
125        sllx %l7, 24, %l7
126        stx %g3, [%sp + PTREGS_OFF + PT_V9_G3]
127        rdpr %cwp, %l0
128        stx %g4, [%sp + PTREGS_OFF + PT_V9_G4]
129        stx %g5, [%sp + PTREGS_OFF + PT_V9_G5]
130        stx %g6, [%sp + PTREGS_OFF + PT_V9_G6]
131        stx %g7, [%sp + PTREGS_OFF + PT_V9_G7]
132        or %l7, %l0, %l7
133        sethi %hi(TSTATE_TSO | TSTATE_PEF), %l0
134        or %l7, %l0, %l7
135        wrpr %l2, %tnpc
136        wrpr %l7, (TSTATE_PRIV | TSTATE_IE), %tstate
137        stx %i0, [%sp + PTREGS_OFF + PT_V9_I0]
138        stx %i1, [%sp + PTREGS_OFF + PT_V9_I1]
139        stx %i2, [%sp + PTREGS_OFF + PT_V9_I2]
140        stx %i3, [%sp + PTREGS_OFF + PT_V9_I3]
141        stx %i4, [%sp + PTREGS_OFF + PT_V9_I4]
142        stx %i5, [%sp + PTREGS_OFF + PT_V9_I5]
143        stx %i6, [%sp + PTREGS_OFF + PT_V9_I6]
144        mov %l6, %g6
145        stx %i7, [%sp + PTREGS_OFF + PT_V9_I7]
146        LOAD_PER_CPU_BASE(%g5, %g6, %g4, %g3, %l1)
147        ldx [%g6 + TI_TASK], %g4
148        done
149
1503: mov ASI_P, %l7
151        ldub [%l6 + TI_FPDEPTH], %l5
152        add %l6, TI_FPSAVED + 1, %l4
153        srl %l5, 1, %l3
154        add %l5, 2, %l5
155        stb %l5, [%l6 + TI_FPDEPTH]
156        ba,pt %xcc, 2b
157         stb %g0, [%l4 + %l3]
158        nop
159
160etraptl1: /* Save tstate/tpc/tnpc of TL 1-->4 and the tl register itself.
161         * We place this right after pt_regs on the trap stack.
162         * The layout is:
163         * 0x00 TL1's TSTATE
164         * 0x08 TL1's TPC
165         * 0x10 TL1's TNPC
166         * 0x18 TL1's TT
167         * ...
168         * 0x58 TL4's TT
169         * 0x60 TL
170         */
171        TRAP_LOAD_THREAD_REG(%g6, %g1)
172        sub %sp, ((4 * 8) * 4) + 8, %g2
173        rdpr %tl, %g1
174
175        wrpr %g0, 1, %tl
176        rdpr %tstate, %g3
177        stx %g3, [%g2 + STACK_BIAS + 0x00]
178        rdpr %tpc, %g3
179        stx %g3, [%g2 + STACK_BIAS + 0x08]
180        rdpr %tnpc, %g3
181        stx %g3, [%g2 + STACK_BIAS + 0x10]
182        rdpr %tt, %g3
183        stx %g3, [%g2 + STACK_BIAS + 0x18]
184
185        wrpr %g0, 2, %tl
186        rdpr %tstate, %g3
187        stx %g3, [%g2 + STACK_BIAS + 0x20]
188        rdpr %tpc, %g3
189        stx %g3, [%g2 + STACK_BIAS + 0x28]
190        rdpr %tnpc, %g3
191        stx %g3, [%g2 + STACK_BIAS + 0x30]
192        rdpr %tt, %g3
193        stx %g3, [%g2 + STACK_BIAS + 0x38]
194
195        sethi %hi(is_sun4v), %g3
196        lduw [%g3 + %lo(is_sun4v)], %g3
197        brnz,pn %g3, finish_tl1_capture
198         nop
199
200        wrpr %g0, 3, %tl
201        rdpr %tstate, %g3
202        stx %g3, [%g2 + STACK_BIAS + 0x40]
203        rdpr %tpc, %g3
204        stx %g3, [%g2 + STACK_BIAS + 0x48]
205        rdpr %tnpc, %g3
206        stx %g3, [%g2 + STACK_BIAS + 0x50]
207        rdpr %tt, %g3
208        stx %g3, [%g2 + STACK_BIAS + 0x58]
209
210        wrpr %g0, 4, %tl
211        rdpr %tstate, %g3
212        stx %g3, [%g2 + STACK_BIAS + 0x60]
213        rdpr %tpc, %g3
214        stx %g3, [%g2 + STACK_BIAS + 0x68]
215        rdpr %tnpc, %g3
216        stx %g3, [%g2 + STACK_BIAS + 0x70]
217        rdpr %tt, %g3
218        stx %g3, [%g2 + STACK_BIAS + 0x78]
219
220        stx %g1, [%g2 + STACK_BIAS + 0x80]
221
222finish_tl1_capture:
223        wrpr %g0, 1, %tl
224661: nop
225        .section .sun4v_1insn_patch, "ax"
226        .word 661b
227        SET_GL(1)
228        .previous
229
230        rdpr %tstate, %g1
231        sub %g2, STACKFRAME_SZ + TRACEREG_SZ - STACK_BIAS, %g2
232        ba,pt %xcc, 1b
233         andcc %g1, TSTATE_PRIV, %g0
234
235#undef TASK_REGOFF
236#undef ETRAP_PSTATE1
237

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