1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
|
/******************************************************************************
* Copyright (c) 2004, 2008 IBM Corporation
* All rights reserved.
* This program and the accompanying materials
* are made available under the terms of the BSD License
* which accompanies this distribution, and is available at
* http://www.opensource.org/licenses/bsd-license.php
*
* Contributors:
* IBM Corporation - initial implementation
*****************************************************************************/
#include <macros.h>
#define STACKSIZE 0x2000
#
# The generic exception code.
#
# Enter with GPR0 = vector, SPRG0 = saved GPR0
#
.section ".entry_text"
the_handler:
.quad handler
eregs:
/* the_exception_frame is a C variable which is usually
* defined in $(TARG).c
* the_exception_frame can be accessed from paflof through
* the word eregs
* in the case an excpetion is handled paflof will read
* from eregs the values of all registers and print them
* out in the exception handler */
.quad the_exception_frame
handler:
mtsprg 1,1 # SPRG1 = saved GPR1
bcl 20,31,$+4
mflr 1
ld 1,eregs-$+4(1) # GPR1 = address of register save area
.irp i, 2,3,4,5,6,7,8,9,10,11,12,13,14,15, \
16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31
std \i,\i*8(1)
.endr # save GPR2..GPR31
li r3, 3 // GPR3 = mode (param_1, param_2)
mr 4,0 // GPR4 = vector
mfsprg 0,0
std 0,0(1) # save GPR0
mfsprg 0,1
std 0,8(1) # save GPR1
cmpwi r4, 0x900 # Decrementer interrupt
bne 0f
mfdec r5 # Save old value of decrementer as reason
lis r0,0x7fff # Set decrementer to highest value
mtdec r0
0:
mfcr 0
std 0,0x100(1)
mfxer 0
std 0,0x108(1)
mfsprg 0,3 # save lr
std 0,0x110(1)
mfsprg 0,2 # save ctr
std 0,0x118(1)
mfsrr0 0
std 0,0x120(1)
mfsrr1 0
std 0,0x128(1)
mfdar 0
std 0,0x130(1)
mfdsisr 0
std 0,0x138(1) # save special regs
bcl 20, 31, over
base:
.align 3
.the_system_stack:
.quad the_system_stack+STACKSIZE-base
over:
mflr r2 /* gpr 2 is the base */
ld r1, .the_system_stack-base(r2) /* load stack pointer */
add r1, r1, r2 /* add base */
li r0, 0
stdu r0, -0x10(r1)
stdu r1, -0x100(r1)
lis 2,engine@ha
ld 0,engine@l(2) # set up entry
mtsrr0 0
ld 2,8+engine@l(2) # set up TOC pointer
rfid
# b .engine # ...and run!
#
# Swap non-volatile client interface regs, plus GPR3..GPR7.
#
swap_ci_regs:
/* save lr */
mflr r0
/* let's find out where our client stack is */
bcl 20, 31, client_over
client_base:
.align 3
.the_client_frame:
.quad the_client_frame-client_base
client_over:
mflr r8 /* gpr 2 is the client_base */
mtlr r0 /* restore the original lr */
ld r0, .the_client_frame-client_base(r8)
add r8, r0, r8 /* add the client_base */
/* r8 now contains the address of the_client_frame */
.irp i, 1,2,3,4,5,6,7, \
13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31
ld 0,\i*8(8)
std \i,\i*8(8)
mr \i,0
.endr # swap GPR1..7, GPR13..31
ld 0,0x100(8)
mfcr 9
mtcrf 0xff,0
std 9,0x100(8) # swap CR
ld 0,0x128(8)
mfmsr 9
mtmsrd 0
sync
isync
std 9,0x128(8) # swap MSR
blr
#
# Entry point for the OF client interface.
#
.globl client_entry_point
.section ".opd","aw"
.align 3
client_entry_point:
.quad .client_entry_point,.TOC.@tocbase,0
.previous
.type .client_entry_point,@function
.globl .client_entry_point
.client_entry_point:
mflr 4
bl swap_ci_regs # swap regs
mtlr 4
li 3, 0 # client call
blr
#
# Start the client.
#
.globl call_client
.section ".opd","aw"
.align 3
call_client:
.quad .call_client,.TOC.@tocbase,0
.previous
.type .call_client,@function
.globl .call_client
.call_client: # called with r3 = address, returns r3
mflr 4
mtctr 3
bl swap_ci_regs
/* Check if LE loading */
cmpwi 0,13,1
beq 0f
bctrl
b 1f
0: /* handle LE */
mfmsr 13
xori 13,13,1
mtsrr1 13
mfctr 13
mr 12,13
mtsrr0 13
rfid
#if 0 /* in case we return back, still to be tested */
.long 0x05009f42; /* bcl 20,31,$+4 */
.long 0xa602c87d; /* mflr r14 */
.long 0x1c00ce39; /* addi r14,r14,28 */
.long 0xa600e07d; /* mfmsr r15 */
.long 0x0100ef69; /* xori r15,r15,1 */
.long 0xa603da7d; /* mtsrr0 r14 */
.long 0xa603fb7d; /* mtsrr1 r15 */
.long 0x2400004c; /* rfid */
#endif
1:
bl swap_ci_regs
mtlr 4
li 3, -1 # client app return
blr
.lcomm the_system_stack, STACKSIZE, 16
|
