xref: /openbmc/u-boot/arch/arc/lib/ints_low.S (revision 7c4213f6)
1/*
2 * Copyright (C) 2013-2015 Synopsys, Inc. All rights reserved.
3 *
4 * SPDX-License-Identifier:	GPL-2.0+
5 */
6
7#include <linux/linkage.h>
8
9/*
10 * Note on the LD/ST addressing modes with address register write-back
11 *
12 * LD.a same as LD.aw
13 *
14 * LD.a    reg1, [reg2, x]  => Pre Incr
15 *      Eff Addr for load = [reg2 + x]
16 *
17 * LD.ab   reg1, [reg2, x]  => Post Incr
18 *      Eff Addr for load = [reg2]
19 */
20
21.macro PUSH reg
22	st.a	\reg, [%sp, -4]
23.endm
24
25.macro PUSHAX aux
26	lr	%r9, [\aux]
27	PUSH	%r9
28.endm
29
30.macro  SAVE_R1_TO_R24
31	PUSH	%r1
32	PUSH	%r2
33	PUSH	%r3
34	PUSH	%r4
35	PUSH	%r5
36	PUSH	%r6
37	PUSH	%r7
38	PUSH	%r8
39	PUSH	%r9
40	PUSH	%r10
41	PUSH	%r11
42	PUSH	%r12
43	PUSH	%r13
44	PUSH	%r14
45	PUSH	%r15
46	PUSH	%r16
47	PUSH	%r17
48	PUSH	%r18
49	PUSH	%r19
50	PUSH	%r20
51	PUSH	%r21
52	PUSH	%r22
53	PUSH	%r23
54	PUSH	%r24
55.endm
56
57.macro SAVE_ALL_SYS
58	/* saving %r0 to reg->r0 in advance since we read %ecr into it */
59	st	%r0, [%sp, -8]
60	lr	%r0, [%ecr]	/* all stack addressing is manual so far */
61	st	%r0, [%sp]
62	st	%sp, [%sp, -4]
63	/* now move %sp to reg->r0 position so we can do "push" automatically */
64	sub	%sp, %sp, 8
65
66	SAVE_R1_TO_R24
67	PUSH	%r25
68	PUSH	%gp
69	PUSH	%fp
70	PUSH	%blink
71	PUSHAX	%eret
72	PUSHAX	%erstatus
73	PUSH	%lp_count
74	PUSHAX	%lp_end
75	PUSHAX	%lp_start
76	PUSHAX	%erbta
77.endm
78
79.macro SAVE_EXCEPTION_SOURCE
80#ifdef CONFIG_MMU
81	/* If MMU exists exception faulting address is loaded in EFA reg */
82	lr	%r0, [%efa]
83#else
84	/* Otherwise in ERET (exception return) reg */
85	lr	%r0, [%eret]
86#endif
87.endm
88
89ENTRY(memory_error)
90	SAVE_ALL_SYS
91	SAVE_EXCEPTION_SOURCE
92	mov	%r1, %sp
93	j	do_memory_error
94ENDPROC(memory_error)
95
96ENTRY(instruction_error)
97	SAVE_ALL_SYS
98	SAVE_EXCEPTION_SOURCE
99	mov	%r1, %sp
100	j	do_instruction_error
101ENDPROC(instruction_error)
102
103ENTRY(interrupt_handler)
104	/* Todo - save and restore CPU context when interrupts will be in use */
105	bl	do_interrupt_handler
106	rtie
107ENDPROC(interrupt_handler)
108
109ENTRY(EV_MachineCheck)
110	SAVE_ALL_SYS
111	SAVE_EXCEPTION_SOURCE
112	mov	%r1, %sp
113	j	do_machine_check_fault
114ENDPROC(EV_MachineCheck)
115
116ENTRY(EV_TLBMissI)
117	SAVE_ALL_SYS
118	mov	%r0, %sp
119	j	do_itlb_miss
120ENDPROC(EV_TLBMissI)
121
122ENTRY(EV_TLBMissD)
123	SAVE_ALL_SYS
124	mov	%r0, %sp
125	j	do_dtlb_miss
126ENDPROC(EV_TLBMissD)
127
128ENTRY(EV_TLBProtV)
129	SAVE_ALL_SYS
130	SAVE_EXCEPTION_SOURCE
131	mov	%r1, %sp
132	j	do_tlb_prot_violation
133ENDPROC(EV_TLBProtV)
134
135ENTRY(EV_PrivilegeV)
136	SAVE_ALL_SYS
137	mov	%r0, %sp
138	j	do_privilege_violation
139ENDPROC(EV_PrivilegeV)
140
141ENTRY(EV_Trap)
142	SAVE_ALL_SYS
143	mov	%r0, %sp
144	j	do_trap
145ENDPROC(EV_Trap)
146
147ENTRY(EV_Extension)
148	SAVE_ALL_SYS
149	mov	%r0, %sp
150	j	do_extension
151ENDPROC(EV_Extension)
152