1/* entry-table.S: main trap vector tables and exception jump table
2 *
3 * Copyright (C) 2003 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 *
11 */
12
13#include <linux/sys.h>
14#include <linux/linkage.h>
15#include <asm/spr-regs.h>
16
17###############################################################################
18#
19# Declare the main trap and vector tables
20#
21# There are six tables:
22#
23# (1) The trap table for debug mode
24# (2) The trap table for kernel mode
25# (3) The trap table for user mode
26#
27#     The CPU jumps to an appropriate slot in the appropriate table to perform
28#     exception processing. We have three different tables for the three
29#     different CPU modes because there is no hardware differentiation between
30#     stack pointers for these three modes, and so we have to invent one when
31#     crossing mode boundaries.
32#
33# (4) The exception handler vector table
34#
35#     The user and kernel trap tables use the same prologue for normal
36#     exception processing. The prologue then jumps to the handler in this
37#     table, as indexed by the exception ID from the TBR.
38#
39# (5) The fixup table for kernel-trap single-step
40# (6) The fixup table for user-trap single-step
41#
42#     Due to the way single-stepping works on this CPU (single-step is not
43#     disabled when crossing exception boundaries, only when in debug mode),
44#     we have to catch the single-step event in break.S and jump to the fixup
45#     routine pointed to by this table.
46#
47# The linker script places the user mode and kernel mode trap tables on to
48# the same 8Kb page, so that break.S can be more efficient when performing
49# single-step bypass management
50#
51###############################################################################
52
53	# trap table for entry from debug mode
54	.section	.trap.break,"ax"
55	.balign		256*16
56	.globl		__entry_breaktrap_table
57__entry_breaktrap_table:
58
59	# trap table for entry from user mode
60	.section	.trap.user,"ax"
61	.balign		256*16
62	.globl		__entry_usertrap_table
63__entry_usertrap_table:
64
65	# trap table for entry from kernel mode
66	.section	.trap.kernel,"ax"
67	.balign		256*16
68	.globl		__entry_kerneltrap_table
69__entry_kerneltrap_table:
70
71	# exception handler jump table
72	.section	.trap.vector,"ax"
73	.balign		256*4
74	.globl		__entry_vector_table
75__entry_vector_table:
76
77	# trap fixup table for single-stepping in user mode
78	.section	.trap.fixup.user,"a"
79	.balign		256*4
80	.globl		__break_usertrap_fixup_table
81__break_usertrap_fixup_table:
82
83	# trap fixup table for single-stepping in user mode
84	.section	.trap.fixup.kernel,"a"
85	.balign		256*4
86	.globl		__break_kerneltrap_fixup_table
87__break_kerneltrap_fixup_table:
88
89	# handler declaration for a software or program interrupt
90.macro VECTOR_SOFTPROG tbr_tt, vec
91	.section .trap.user
92	.org		\tbr_tt
93	bra		__entry_uspace_softprog_interrupt
94	.section .trap.fixup.user
95	.org		\tbr_tt >> 2
96	.long		__break_step_uspace_softprog_interrupt
97	.section .trap.kernel
98	.org		\tbr_tt
99	bra		__entry_kernel_softprog_interrupt
100	.section .trap.fixup.kernel
101	.org		\tbr_tt >> 2
102	.long		__break_step_kernel_softprog_interrupt
103	.section .trap.vector
104	.org		\tbr_tt >> 2
105	.long		\vec
106.endm
107
108	# handler declaration for a maskable external interrupt
109.macro VECTOR_IRQ tbr_tt, vec
110	.section .trap.user
111	.org		\tbr_tt
112	bra		__entry_uspace_external_interrupt
113	.section .trap.fixup.user
114	.org		\tbr_tt >> 2
115	.long		__break_step_uspace_external_interrupt
116	.section .trap.kernel
117	.org		\tbr_tt
118	# deal with virtual interrupt disablement
119	beq		icc2,#0,__entry_kernel_external_interrupt_virtually_disabled
120	bra		__entry_kernel_external_interrupt
121	.section .trap.fixup.kernel
122	.org		\tbr_tt >> 2
123	.long		__break_step_kernel_external_interrupt
124	.section .trap.vector
125	.org		\tbr_tt >> 2
126	.long		\vec
127.endm
128
129	# handler declaration for an NMI external interrupt
130.macro VECTOR_NMI tbr_tt, vec
131	.section .trap.user
132	.org		\tbr_tt
133	break
134	break
135	break
136	break
137	.section .trap.kernel
138	.org		\tbr_tt
139	break
140	break
141	break
142	break
143	.section .trap.vector
144	.org		\tbr_tt >> 2
145	.long		\vec
146.endm
147
148	# handler declaration for an MMU only software or program interrupt
149.macro VECTOR_SP_MMU tbr_tt, vec
150#ifdef CONFIG_MMU
151 	VECTOR_SOFTPROG	\tbr_tt, \vec
152#else
153	VECTOR_NMI	\tbr_tt, 0
154#endif
155.endm
156
157
158###############################################################################
159#
160# specification of the vectors
161# - note: each macro inserts code into multiple sections
162#
163###############################################################################
164	VECTOR_SP_MMU	TBR_TT_INSTR_MMU_MISS,	__entry_insn_mmu_miss
165	VECTOR_SOFTPROG	TBR_TT_INSTR_ACC_ERROR,	__entry_insn_access_error
166	VECTOR_SOFTPROG	TBR_TT_INSTR_ACC_EXCEP,	__entry_insn_access_exception
167	VECTOR_SOFTPROG	TBR_TT_PRIV_INSTR,	__entry_privileged_instruction
168	VECTOR_SOFTPROG	TBR_TT_ILLEGAL_INSTR,	__entry_illegal_instruction
169	VECTOR_SOFTPROG	TBR_TT_FP_EXCEPTION,	__entry_media_exception
170	VECTOR_SOFTPROG	TBR_TT_MP_EXCEPTION,	__entry_media_exception
171	VECTOR_SOFTPROG	TBR_TT_DATA_ACC_ERROR,	__entry_data_access_error
172	VECTOR_SP_MMU	TBR_TT_DATA_MMU_MISS,	__entry_data_mmu_miss
173	VECTOR_SOFTPROG	TBR_TT_DATA_ACC_EXCEP,	__entry_data_access_exception
174	VECTOR_SOFTPROG	TBR_TT_DATA_STR_ERROR,	__entry_data_store_error
175	VECTOR_SOFTPROG	TBR_TT_DIVISION_EXCEP,	__entry_division_exception
176
177#ifdef CONFIG_MMU
178	.section .trap.user
179	.org		TBR_TT_INSTR_TLB_MISS
180	.globl		__trap_user_insn_tlb_miss
181__trap_user_insn_tlb_miss:
182	movsg		ear0,gr28			/* faulting address */
183	movsg		scr0,gr31			/* get mapped PTD coverage start address */
184	xor.p		gr28,gr31,gr31			/* compare addresses */
185	bra		__entry_user_insn_tlb_miss
186
187	.org		TBR_TT_DATA_TLB_MISS
188	.globl		__trap_user_data_tlb_miss
189__trap_user_data_tlb_miss:
190	movsg		ear0,gr28			/* faulting address */
191	movsg		scr1,gr31			/* get mapped PTD coverage start address */
192	xor.p		gr28,gr31,gr31			/* compare addresses */
193	bra		__entry_user_data_tlb_miss
194
195	.section .trap.kernel
196	.org		TBR_TT_INSTR_TLB_MISS
197	.globl		__trap_kernel_insn_tlb_miss
198__trap_kernel_insn_tlb_miss:
199	movsg		ear0,gr29			/* faulting address */
200	movsg		scr0,gr31			/* get mapped PTD coverage start address */
201	xor.p		gr29,gr31,gr31			/* compare addresses */
202	bra		__entry_kernel_insn_tlb_miss
203
204	.org		TBR_TT_DATA_TLB_MISS
205	.globl		__trap_kernel_data_tlb_miss
206__trap_kernel_data_tlb_miss:
207	movsg		ear0,gr29			/* faulting address */
208	movsg		scr1,gr31			/* get mapped PTD coverage start address */
209	xor.p		gr29,gr31,gr31			/* compare addresses */
210	bra		__entry_kernel_data_tlb_miss
211
212	.section .trap.fixup.user
213	.org		TBR_TT_INSTR_TLB_MISS >> 2
214	.globl		__trap_fixup_user_insn_tlb_miss
215__trap_fixup_user_insn_tlb_miss:
216	.long		__break_user_insn_tlb_miss
217	.org		TBR_TT_DATA_TLB_MISS >> 2
218	.globl		__trap_fixup_user_data_tlb_miss
219__trap_fixup_user_data_tlb_miss:
220	.long		__break_user_data_tlb_miss
221
222	.section .trap.fixup.kernel
223	.org		TBR_TT_INSTR_TLB_MISS >> 2
224	.globl		__trap_fixup_kernel_insn_tlb_miss
225__trap_fixup_kernel_insn_tlb_miss:
226	.long		__break_kernel_insn_tlb_miss
227	.org		TBR_TT_DATA_TLB_MISS >> 2
228	.globl		__trap_fixup_kernel_data_tlb_miss
229__trap_fixup_kernel_data_tlb_miss:
230	.long		__break_kernel_data_tlb_miss
231
232	.section .trap.vector
233	.org		TBR_TT_INSTR_TLB_MISS >> 2
234	.long		__entry_insn_mmu_fault
235	.org		TBR_TT_DATA_TLB_MISS >> 2
236	.long		__entry_data_mmu_fault
237#endif
238
239	VECTOR_SP_MMU	TBR_TT_DATA_DAT_EXCEP,	__entry_data_dat_fault
240	VECTOR_NMI	TBR_TT_DECREMENT_TIMER,	__entry_do_NMI
241	VECTOR_SOFTPROG	TBR_TT_COMPOUND_EXCEP,	__entry_compound_exception
242	VECTOR_IRQ	TBR_TT_INTERRUPT_1,	__entry_do_IRQ
243	VECTOR_IRQ	TBR_TT_INTERRUPT_2,	__entry_do_IRQ
244	VECTOR_IRQ	TBR_TT_INTERRUPT_3,	__entry_do_IRQ
245	VECTOR_IRQ	TBR_TT_INTERRUPT_4,	__entry_do_IRQ
246	VECTOR_IRQ	TBR_TT_INTERRUPT_5,	__entry_do_IRQ
247	VECTOR_IRQ	TBR_TT_INTERRUPT_6,	__entry_do_IRQ
248	VECTOR_IRQ	TBR_TT_INTERRUPT_7,	__entry_do_IRQ
249	VECTOR_IRQ	TBR_TT_INTERRUPT_8,	__entry_do_IRQ
250	VECTOR_IRQ	TBR_TT_INTERRUPT_9,	__entry_do_IRQ
251	VECTOR_IRQ	TBR_TT_INTERRUPT_10,	__entry_do_IRQ
252	VECTOR_IRQ	TBR_TT_INTERRUPT_11,	__entry_do_IRQ
253	VECTOR_IRQ	TBR_TT_INTERRUPT_12,	__entry_do_IRQ
254	VECTOR_IRQ	TBR_TT_INTERRUPT_13,	__entry_do_IRQ
255	VECTOR_IRQ	TBR_TT_INTERRUPT_14,	__entry_do_IRQ
256	VECTOR_NMI	TBR_TT_INTERRUPT_15,	__entry_do_NMI
257
258	# miscellaneous user mode entry points
259	.section	.trap.user
260	.org		TBR_TT_TRAP0
261	.rept		127
262	bra		__entry_uspace_softprog_interrupt
263	.long		0,0,0
264	.endr
265	.org		TBR_TT_BREAK
266	bra		__entry_break
267	.long		0,0,0
268
269	.section	.trap.fixup.user
270	.org		TBR_TT_TRAP0 >> 2
271	.rept		127
272	.long		__break_step_uspace_softprog_interrupt
273	.endr
274	.org		TBR_TT_BREAK >> 2
275	.long		0
276
277	# miscellaneous kernel mode entry points
278	.section	.trap.kernel
279	.org		TBR_TT_TRAP0
280	bra		__entry_kernel_softprog_interrupt
281	.org		TBR_TT_TRAP1
282	bra		__entry_kernel_softprog_interrupt
283
284	# trap #2 in kernel - reenable interrupts
285	.org		TBR_TT_TRAP2
286	bra		__entry_kernel_external_interrupt_virtual_reenable
287
288	# miscellaneous kernel traps
289	.org		TBR_TT_TRAP3
290	.rept		124
291	bra		__entry_kernel_softprog_interrupt
292	.long		0,0,0
293	.endr
294	.org		TBR_TT_BREAK
295	bra		__entry_break
296	.long		0,0,0
297
298	.section	.trap.fixup.kernel
299	.org		TBR_TT_TRAP0 >> 2
300	.long		__break_step_kernel_softprog_interrupt
301	.long		__break_step_kernel_softprog_interrupt
302	.long		__break_step_kernel_external_interrupt_virtual_reenable
303	.rept		124
304	.long		__break_step_kernel_softprog_interrupt
305	.endr
306	.org		TBR_TT_BREAK >> 2
307	.long		0
308
309	# miscellaneous debug mode entry points
310	.section	.trap.break
311	.org		TBR_TT_BREAK
312	movsg		bpcsr,gr30
313	jmpl		@(gr30,gr0)
314
315	# miscellaneous vectors
316	.section	.trap.vector
317	.org		TBR_TT_TRAP0 >> 2
318	.long		system_call
319	.rept		119
320	.long		__entry_unsupported_trap
321	.endr
322
323	# userspace atomic op emulation, traps 120-126
324	.rept		7
325	.long		__entry_atomic_op
326	.endr
327
328	.org		TBR_TT_BREAK >> 2
329	.long		__entry_debug_exception
330