1 | /* |
---|
2 | * Copyright (c) 2011 Aeroflex Gaisler |
---|
3 | * |
---|
4 | * BSD license: |
---|
5 | * |
---|
6 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
---|
7 | * of this software and associated documentation files (the "Software"), to deal |
---|
8 | * in the Software without restriction, including without limitation the rights |
---|
9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
---|
10 | * copies of the Software, and to permit persons to whom the Software is |
---|
11 | * furnished to do so, subject to the following conditions: |
---|
12 | * |
---|
13 | * The above copyright notice and this permission notice shall be included in |
---|
14 | * all copies or substantial portions of the Software. |
---|
15 | * |
---|
16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
---|
17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
---|
18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
---|
19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
---|
20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
---|
21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
---|
22 | * THE SOFTWARE. |
---|
23 | */ |
---|
24 | |
---|
25 | |
---|
26 | /* The traptable has to be the first code in a boot PROM. */ |
---|
27 | |
---|
28 | #include <asm-leon/head.h> |
---|
29 | |
---|
30 | #define TRAP(H) mov %psr, %l0; sethi %hi(H), %l4; jmp %l4+%lo(H); nop; |
---|
31 | #define TRAPL(H) mov %g0, %l0; sethi %hi(H), %l4; jmp %l4+%lo(H); nop; |
---|
32 | #define TRAP_ENTRY(H) rd %psr, %l0; b H; rd %wim, %l3; nop; |
---|
33 | |
---|
34 | #define WIM_INIT 2 |
---|
35 | #ifdef _SOFT_FLOAT |
---|
36 | #define PSR_INIT 0x0e0 |
---|
37 | #else |
---|
38 | #define PSR_INIT 0x10e0 |
---|
39 | #endif |
---|
40 | |
---|
41 | #define NUMREGWINDOWS 8 |
---|
42 | |
---|
43 | /* Unexcpected trap will halt the processor by forcing it to error state */ |
---|
44 | #define BAD_TRAP ta 0; nop; nop; nop; |
---|
45 | |
---|
46 | /* Software trap. Treat as BAD_TRAP */ |
---|
47 | #define SOFT_TRAP BAD_TRAP |
---|
48 | |
---|
49 | #define TT_MASK 0xff0 // trap type mask from tbr |
---|
50 | #define TT_SHL 4 // shift to get a tbr value |
---|
51 | |
---|
52 | .seg "text" |
---|
53 | |
---|
54 | /* ------- */ |
---|
55 | .weak _start_svt_weak |
---|
56 | .set _start_svt_weak,_start_svt_disp |
---|
57 | /* ------- */ |
---|
58 | |
---|
59 | .global _trap_table, cpuinit, _hardreset, _hardreset_svt |
---|
60 | .global _fpdis_enable_svt,_fpdis_svt,_window_overflow_svt,_window_underflow_svt |
---|
61 | .global _leonbare_irq_entry_svt,_irqcall_svt,_flush_windows_svt,_srmmu_fault_svt,_irqcall_disableirq_svt |
---|
62 | .global start, _start_svt_real |
---|
63 | |
---|
64 | _start_svt_real: |
---|
65 | nop |
---|
66 | |
---|
67 | _start_svt_disp: |
---|
68 | rd %tbr, %l3 |
---|
69 | rd %psr, %l0 |
---|
70 | ! here,locals have been set up as follows: |
---|
71 | ! %l0 = psr |
---|
72 | ! %l1 = pc |
---|
73 | ! %l2 = npc |
---|
74 | ! %l3 = tbr |
---|
75 | and %l3,TT_MASK,%l3 |
---|
76 | srl %l3,TT_SHL,%l3 |
---|
77 | |
---|
78 | /* |
---|
79 | struct get { |
---|
80 | int start,end,func; |
---|
81 | }; |
---|
82 | |
---|
83 | struct get table[3] = { |
---|
84 | {0,1,..}, |
---|
85 | {0,0,0}, |
---|
86 | }; |
---|
87 | |
---|
88 | int gettrap(int nr){ |
---|
89 | struct get *p = table; |
---|
90 | while((p->start) || (p->end) || (p->func)) { |
---|
91 | if (p->start <= nr && p->end >= nr) { |
---|
92 | return p->func; |
---|
93 | } |
---|
94 | p++; |
---|
95 | } |
---|
96 | return 0; |
---|
97 | } |
---|
98 | |
---|
99 | $sparc-elf-gcc -S gettrap.c -o test.S -O2 |
---|
100 | */ |
---|
101 | |
---|
102 | #define loc_o0 l3 |
---|
103 | #define loc_o1 l4 |
---|
104 | #define loc_o2 l5 |
---|
105 | #define loc_o3 l6 |
---|
106 | |
---|
107 | sethi %hi(trap_table), %loc_o2 |
---|
108 | or %loc_o2, %lo(trap_table), %loc_o2 |
---|
109 | mov %loc_o0, %loc_o3 |
---|
110 | ld [%loc_o2], %loc_o1 |
---|
111 | .LL13: |
---|
112 | cmp %loc_o1, %loc_o3 |
---|
113 | .LL12: |
---|
114 | bg,a .LL11 |
---|
115 | add %loc_o2, 12, %loc_o2 |
---|
116 | ld [%loc_o2+4], %loc_o0 |
---|
117 | cmp %loc_o0, %loc_o3 |
---|
118 | bge,a .LL1 |
---|
119 | ld [%loc_o2+8], %loc_o0 |
---|
120 | add %loc_o2, 12, %loc_o2 |
---|
121 | .LL11: |
---|
122 | ld [%loc_o2], %loc_o0 |
---|
123 | orcc %loc_o0, 0, %loc_o1 |
---|
124 | bne .LL12 |
---|
125 | cmp %loc_o1, %loc_o3 |
---|
126 | ld [%loc_o2+4], %loc_o0 |
---|
127 | cmp %loc_o0, 0 |
---|
128 | bne .LL12 |
---|
129 | cmp %loc_o1, %loc_o3 |
---|
130 | ld [%loc_o2+8], %loc_o0 |
---|
131 | cmp %loc_o0, 0 |
---|
132 | bne .LL12 |
---|
133 | cmp %loc_o1, %loc_o3 |
---|
134 | |
---|
135 | !not in table |
---|
136 | BAD_TRAP |
---|
137 | |
---|
138 | .LL1: |
---|
139 | jmp %loc_o0 |
---|
140 | nop |
---|
141 | |
---|
142 | |
---|
143 | .global trap_table,svt_trap_table_ext,svt_trap_table_ext_end |
---|
144 | .section ".rodata" |
---|
145 | .align 4 |
---|
146 | trap_table: |
---|
147 | .long 0,0, _hardreset_svt |
---|
148 | .long 1,1, _srmmu_fault_svt ! 01 instruction_access_exception (in mmu_asm.S) |
---|
149 | .long 4,4 |
---|
150 | #ifndef _SOFT_FLOAT |
---|
151 | .long _fpdis_enable_svt ! 04 fp_disabled |
---|
152 | #else |
---|
153 | .long _fpdis_svt ! 04 fp_disabled |
---|
154 | #endif |
---|
155 | #ifndef _FLAT |
---|
156 | .long 5, 5, _window_overflow_svt ! 05 window_overflow |
---|
157 | .long 6, 6, _window_underflow_svt ! 06 window_underflow |
---|
158 | #endif |
---|
159 | .long 9,9, _srmmu_fault_svt ! 09 data_access_exception (in mmu_asm.S) |
---|
160 | .long 0x11,0x1f, _leonbare_irq_entry_svt ! 11-1f interrupt level |
---|
161 | .long 0x82,0x82, _irqcall_svt ! 82 |
---|
162 | #ifndef _FLAT |
---|
163 | .long 0x83,0x83, _flush_windows_svt ! 83 |
---|
164 | #endif |
---|
165 | .long 0x85,0x85, _irqcall_disableirq_svt ! 85 |
---|
166 | svt_trap_table_ext: |
---|
167 | .long 0,0,0 |
---|
168 | .long 0,0,0 |
---|
169 | .long 0,0,0 |
---|
170 | .long 0,0,0 |
---|
171 | .long 0,0,0 |
---|
172 | .long 0,0,0 |
---|
173 | .long 0,0,0 |
---|
174 | .long 0,0,0 |
---|
175 | .long 0,0,0 |
---|
176 | .long 0,0,0 |
---|
177 | .long 0,0,0 |
---|
178 | .long 0,0,0 |
---|
179 | .long 0,0,0 |
---|
180 | .long 0,0,0 |
---|
181 | .long 0,0,0 |
---|
182 | .long 0,0,0 |
---|
183 | .long 0,0,0 |
---|
184 | svt_trap_table_ext_end: |
---|
185 | .long 0,0,0 |
---|
186 | |
---|