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authorAurelien Jacquiot <a-jacquiot@ti.com>2011-10-04 11:10:02 -0400
committerMark Salter <msalter@redhat.com>2011-10-06 19:48:02 -0400
commite94e668251ab31b17ef6dcd16ba7fe05ffc1917a (patch)
treeb0024e31bb2a321ccea190d66be4d91f4bc39d29 /arch/c6x/kernel
parent8a0c9e0348479f1b85c640da4795bdd775970bf3 (diff)
C6X: build infrastructure
Original port to early 2.6 kernel using TI COFF toolchain. Brought up to date by Mark Salter <msalter@redhat.com> Signed-off-by: Aurelien Jacquiot <a-jacquiot@ti.com> Signed-off-by: Mark Salter <msalter@redhat.com> Acked-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'arch/c6x/kernel')
-rw-r--r--arch/c6x/kernel/asm-offsets.c123
-rw-r--r--arch/c6x/kernel/entry.S803
-rw-r--r--arch/c6x/kernel/traps.c423
3 files changed, 1349 insertions, 0 deletions
diff --git a/arch/c6x/kernel/asm-offsets.c b/arch/c6x/kernel/asm-offsets.c
new file mode 100644
index 000000000000..759ad6d207b6
--- /dev/null
+++ b/arch/c6x/kernel/asm-offsets.c
@@ -0,0 +1,123 @@
1/*
2 * Generate definitions needed by assembly language modules.
3 * This code generates raw asm output which is post-processed
4 * to extract and format the required data.
5 */
6
7#include <linux/sched.h>
8#include <linux/thread_info.h>
9#include <asm/procinfo.h>
10#include <linux/kbuild.h>
11#include <linux/unistd.h>
12
13void foo(void)
14{
15 OFFSET(REGS_A16, pt_regs, a16);
16 OFFSET(REGS_A17, pt_regs, a17);
17 OFFSET(REGS_A18, pt_regs, a18);
18 OFFSET(REGS_A19, pt_regs, a19);
19 OFFSET(REGS_A20, pt_regs, a20);
20 OFFSET(REGS_A21, pt_regs, a21);
21 OFFSET(REGS_A22, pt_regs, a22);
22 OFFSET(REGS_A23, pt_regs, a23);
23 OFFSET(REGS_A24, pt_regs, a24);
24 OFFSET(REGS_A25, pt_regs, a25);
25 OFFSET(REGS_A26, pt_regs, a26);
26 OFFSET(REGS_A27, pt_regs, a27);
27 OFFSET(REGS_A28, pt_regs, a28);
28 OFFSET(REGS_A29, pt_regs, a29);
29 OFFSET(REGS_A30, pt_regs, a30);
30 OFFSET(REGS_A31, pt_regs, a31);
31
32 OFFSET(REGS_B16, pt_regs, b16);
33 OFFSET(REGS_B17, pt_regs, b17);
34 OFFSET(REGS_B18, pt_regs, b18);
35 OFFSET(REGS_B19, pt_regs, b19);
36 OFFSET(REGS_B20, pt_regs, b20);
37 OFFSET(REGS_B21, pt_regs, b21);
38 OFFSET(REGS_B22, pt_regs, b22);
39 OFFSET(REGS_B23, pt_regs, b23);
40 OFFSET(REGS_B24, pt_regs, b24);
41 OFFSET(REGS_B25, pt_regs, b25);
42 OFFSET(REGS_B26, pt_regs, b26);
43 OFFSET(REGS_B27, pt_regs, b27);
44 OFFSET(REGS_B28, pt_regs, b28);
45 OFFSET(REGS_B29, pt_regs, b29);
46 OFFSET(REGS_B30, pt_regs, b30);
47 OFFSET(REGS_B31, pt_regs, b31);
48
49 OFFSET(REGS_A0, pt_regs, a0);
50 OFFSET(REGS_A1, pt_regs, a1);
51 OFFSET(REGS_A2, pt_regs, a2);
52 OFFSET(REGS_A3, pt_regs, a3);
53 OFFSET(REGS_A4, pt_regs, a4);
54 OFFSET(REGS_A5, pt_regs, a5);
55 OFFSET(REGS_A6, pt_regs, a6);
56 OFFSET(REGS_A7, pt_regs, a7);
57 OFFSET(REGS_A8, pt_regs, a8);
58 OFFSET(REGS_A9, pt_regs, a9);
59 OFFSET(REGS_A10, pt_regs, a10);
60 OFFSET(REGS_A11, pt_regs, a11);
61 OFFSET(REGS_A12, pt_regs, a12);
62 OFFSET(REGS_A13, pt_regs, a13);
63 OFFSET(REGS_A14, pt_regs, a14);
64 OFFSET(REGS_A15, pt_regs, a15);
65
66 OFFSET(REGS_B0, pt_regs, b0);
67 OFFSET(REGS_B1, pt_regs, b1);
68 OFFSET(REGS_B2, pt_regs, b2);
69 OFFSET(REGS_B3, pt_regs, b3);
70 OFFSET(REGS_B4, pt_regs, b4);
71 OFFSET(REGS_B5, pt_regs, b5);
72 OFFSET(REGS_B6, pt_regs, b6);
73 OFFSET(REGS_B7, pt_regs, b7);
74 OFFSET(REGS_B8, pt_regs, b8);
75 OFFSET(REGS_B9, pt_regs, b9);
76 OFFSET(REGS_B10, pt_regs, b10);
77 OFFSET(REGS_B11, pt_regs, b11);
78 OFFSET(REGS_B12, pt_regs, b12);
79 OFFSET(REGS_B13, pt_regs, b13);
80 OFFSET(REGS_DP, pt_regs, dp);
81 OFFSET(REGS_SP, pt_regs, sp);
82
83 OFFSET(REGS_TSR, pt_regs, tsr);
84 OFFSET(REGS_ORIG_A4, pt_regs, orig_a4);
85
86 DEFINE(REGS__END, sizeof(struct pt_regs));
87 BLANK();
88
89 OFFSET(THREAD_PC, thread_struct, pc);
90 OFFSET(THREAD_B15_14, thread_struct, b15_14);
91 OFFSET(THREAD_A15_14, thread_struct, a15_14);
92 OFFSET(THREAD_B13_12, thread_struct, b13_12);
93 OFFSET(THREAD_A13_12, thread_struct, a13_12);
94 OFFSET(THREAD_B11_10, thread_struct, b11_10);
95 OFFSET(THREAD_A11_10, thread_struct, a11_10);
96 OFFSET(THREAD_RICL_ICL, thread_struct, ricl_icl);
97 BLANK();
98
99 OFFSET(TASK_STATE, task_struct, state);
100 BLANK();
101
102 OFFSET(THREAD_INFO_FLAGS, thread_info, flags);
103 OFFSET(THREAD_INFO_PREEMPT_COUNT, thread_info, preempt_count);
104 BLANK();
105
106 /* These would be unneccessary if we ran asm files
107 * through the preprocessor.
108 */
109 DEFINE(KTHREAD_SIZE, THREAD_SIZE);
110 DEFINE(KTHREAD_SHIFT, THREAD_SHIFT);
111 DEFINE(KTHREAD_START_SP, THREAD_START_SP);
112 DEFINE(ENOSYS_, ENOSYS);
113 DEFINE(NR_SYSCALLS_, __NR_syscalls);
114
115 DEFINE(_TIF_SYSCALL_TRACE, (1<<TIF_SYSCALL_TRACE));
116 DEFINE(_TIF_NOTIFY_RESUME, (1<<TIF_NOTIFY_RESUME));
117 DEFINE(_TIF_SIGPENDING, (1<<TIF_SIGPENDING));
118 DEFINE(_TIF_NEED_RESCHED, (1<<TIF_NEED_RESCHED));
119 DEFINE(_TIF_POLLING_NRFLAG, (1<<TIF_POLLING_NRFLAG));
120
121 DEFINE(_TIF_ALLWORK_MASK, TIF_ALLWORK_MASK);
122 DEFINE(_TIF_WORK_MASK, TIF_WORK_MASK);
123}
diff --git a/arch/c6x/kernel/entry.S b/arch/c6x/kernel/entry.S
new file mode 100644
index 000000000000..3e977ccda827
--- /dev/null
+++ b/arch/c6x/kernel/entry.S
@@ -0,0 +1,803 @@
1;
2; Port on Texas Instruments TMS320C6x architecture
3;
4; Copyright (C) 2004-2011 Texas Instruments Incorporated
5; Author: Aurelien Jacquiot (aurelien.jacquiot@virtuallogix.com)
6; Updated for 2.6.34: Mark Salter <msalter@redhat.com>
7;
8; This program is free software; you can redistribute it and/or modify
9; it under the terms of the GNU General Public License version 2 as
10; published by the Free Software Foundation.
11;
12
13#include <linux/sys.h>
14#include <linux/linkage.h>
15#include <asm/thread_info.h>
16#include <asm/asm-offsets.h>
17#include <asm/unistd.h>
18#include <asm/errno.h>
19
20; Registers naming
21#define DP B14
22#define SP B15
23
24#ifndef CONFIG_PREEMPT
25#define resume_kernel restore_all
26#endif
27
28 .altmacro
29
30 .macro MASK_INT reg
31 MVC .S2 CSR,reg
32 CLR .S2 reg,0,0,reg
33 MVC .S2 reg,CSR
34 .endm
35
36 .macro UNMASK_INT reg
37 MVC .S2 CSR,reg
38 SET .S2 reg,0,0,reg
39 MVC .S2 reg,CSR
40 .endm
41
42 .macro GET_THREAD_INFO reg
43 SHR .S1X SP,THREAD_SHIFT,reg
44 SHL .S1 reg,THREAD_SHIFT,reg
45 .endm
46
47 ;;
48 ;; This defines the normal kernel pt_regs layout.
49 ;;
50 .macro SAVE_ALL __rp __tsr
51 STW .D2T2 B0,*SP--[2] ; save original B0
52 MVKL .S2 current_ksp,B0
53 MVKH .S2 current_ksp,B0
54 LDW .D2T2 *B0,B1 ; KSP
55
56 NOP 3
57 STW .D2T2 B1,*+SP[1] ; save original B1
58 XOR .D2 SP,B1,B0 ; (SP ^ KSP)
59 LDW .D2T2 *+SP[1],B1 ; restore B0/B1
60 LDW .D2T2 *++SP[2],B0
61 SHR .S2 B0,THREAD_SHIFT,B0 ; 0 if already using kstack
62 [B0] STDW .D2T2 SP:DP,*--B1[1] ; user: save user sp/dp kstack
63 [B0] MV .S2 B1,SP ; and switch to kstack
64||[!B0] STDW .D2T2 SP:DP,*--SP[1] ; kernel: save on current stack
65
66 SUBAW .D2 SP,2,SP
67
68 ADD .D1X SP,-8,A15
69 || STDW .D2T1 A15:A14,*SP--[16] ; save A15:A14
70
71 STDW .D2T2 B13:B12,*SP--[1]
72 || STDW .D1T1 A13:A12,*A15--[1]
73 || MVC .S2 __rp,B13
74
75 STDW .D2T2 B11:B10,*SP--[1]
76 || STDW .D1T1 A11:A10,*A15--[1]
77 || MVC .S2 CSR,B12
78
79 STDW .D2T2 B9:B8,*SP--[1]
80 || STDW .D1T1 A9:A8,*A15--[1]
81 || MVC .S2 RILC,B11
82 STDW .D2T2 B7:B6,*SP--[1]
83 || STDW .D1T1 A7:A6,*A15--[1]
84 || MVC .S2 ILC,B10
85
86 STDW .D2T2 B5:B4,*SP--[1]
87 || STDW .D1T1 A5:A4,*A15--[1]
88
89 STDW .D2T2 B3:B2,*SP--[1]
90 || STDW .D1T1 A3:A2,*A15--[1]
91 || MVC .S2 __tsr,B5
92
93 STDW .D2T2 B1:B0,*SP--[1]
94 || STDW .D1T1 A1:A0,*A15--[1]
95 || MV .S1X B5,A5
96
97 STDW .D2T2 B31:B30,*SP--[1]
98 || STDW .D1T1 A31:A30,*A15--[1]
99 STDW .D2T2 B29:B28,*SP--[1]
100 || STDW .D1T1 A29:A28,*A15--[1]
101 STDW .D2T2 B27:B26,*SP--[1]
102 || STDW .D1T1 A27:A26,*A15--[1]
103 STDW .D2T2 B25:B24,*SP--[1]
104 || STDW .D1T1 A25:A24,*A15--[1]
105 STDW .D2T2 B23:B22,*SP--[1]
106 || STDW .D1T1 A23:A22,*A15--[1]
107 STDW .D2T2 B21:B20,*SP--[1]
108 || STDW .D1T1 A21:A20,*A15--[1]
109 STDW .D2T2 B19:B18,*SP--[1]
110 || STDW .D1T1 A19:A18,*A15--[1]
111 STDW .D2T2 B17:B16,*SP--[1]
112 || STDW .D1T1 A17:A16,*A15--[1]
113
114 STDW .D2T2 B13:B12,*SP--[1] ; save PC and CSR
115
116 STDW .D2T2 B11:B10,*SP--[1] ; save RILC and ILC
117 STDW .D2T1 A5:A4,*SP--[1] ; save TSR and orig A4
118
119 ;; We left an unused word on the stack just above pt_regs.
120 ;; It is used to save whether or not this frame is due to
121 ;; a syscall. It is cleared here, but the syscall handler
122 ;; sets it to a non-zero value.
123 MVK .L2 0,B1
124 STW .D2T2 B1,*+SP(REGS__END+8) ; clear syscall flag
125 .endm
126
127 .macro RESTORE_ALL __rp __tsr
128 LDDW .D2T2 *++SP[1],B9:B8 ; get TSR (B9)
129 LDDW .D2T2 *++SP[1],B11:B10 ; get RILC (B11) and ILC (B10)
130 LDDW .D2T2 *++SP[1],B13:B12 ; get PC (B13) and CSR (B12)
131
132 ADDAW .D1X SP,30,A15
133
134 LDDW .D1T1 *++A15[1],A17:A16
135 || LDDW .D2T2 *++SP[1],B17:B16
136 LDDW .D1T1 *++A15[1],A19:A18
137 || LDDW .D2T2 *++SP[1],B19:B18
138 LDDW .D1T1 *++A15[1],A21:A20
139 || LDDW .D2T2 *++SP[1],B21:B20
140 LDDW .D1T1 *++A15[1],A23:A22
141 || LDDW .D2T2 *++SP[1],B23:B22
142 LDDW .D1T1 *++A15[1],A25:A24
143 || LDDW .D2T2 *++SP[1],B25:B24
144 LDDW .D1T1 *++A15[1],A27:A26
145 || LDDW .D2T2 *++SP[1],B27:B26
146 LDDW .D1T1 *++A15[1],A29:A28
147 || LDDW .D2T2 *++SP[1],B29:B28
148 LDDW .D1T1 *++A15[1],A31:A30
149 || LDDW .D2T2 *++SP[1],B31:B30
150
151 LDDW .D1T1 *++A15[1],A1:A0
152 || LDDW .D2T2 *++SP[1],B1:B0
153
154 LDDW .D1T1 *++A15[1],A3:A2
155 || LDDW .D2T2 *++SP[1],B3:B2
156 || MVC .S2 B9,__tsr
157 LDDW .D1T1 *++A15[1],A5:A4
158 || LDDW .D2T2 *++SP[1],B5:B4
159 || MVC .S2 B11,RILC
160 LDDW .D1T1 *++A15[1],A7:A6
161 || LDDW .D2T2 *++SP[1],B7:B6
162 || MVC .S2 B10,ILC
163
164 LDDW .D1T1 *++A15[1],A9:A8
165 || LDDW .D2T2 *++SP[1],B9:B8
166 || MVC .S2 B13,__rp
167
168 LDDW .D1T1 *++A15[1],A11:A10
169 || LDDW .D2T2 *++SP[1],B11:B10
170 || MVC .S2 B12,CSR
171
172 LDDW .D1T1 *++A15[1],A13:A12
173 || LDDW .D2T2 *++SP[1],B13:B12
174
175 MV .D2X A15,SP
176 || MVKL .S1 current_ksp,A15
177 MVKH .S1 current_ksp,A15
178 || ADDAW .D1X SP,6,A14
179 STW .D1T1 A14,*A15 ; save kernel stack pointer
180
181 LDDW .D2T1 *++SP[1],A15:A14
182
183 B .S2 __rp ; return from interruption
184 LDDW .D2T2 *+SP[1],SP:DP
185 NOP 4
186 .endm
187
188 .section .text
189
190 ;;
191 ;; Jump to schedule() then return to ret_from_exception
192 ;;
193_reschedule:
194#ifdef CONFIG_C6X_BIG_KERNEL
195 MVKL .S1 schedule,A0
196 MVKH .S1 schedule,A0
197 B .S2X A0
198#else
199 B .S1 schedule
200#endif
201 ADDKPC .S2 ret_from_exception,B3,4
202
203 ;;
204 ;; Called before syscall handler when process is being debugged
205 ;;
206tracesys_on:
207#ifdef CONFIG_C6X_BIG_KERNEL
208 MVKL .S1 syscall_trace_entry,A0
209 MVKH .S1 syscall_trace_entry,A0
210 B .S2X A0
211#else
212 B .S1 syscall_trace_entry
213#endif
214 ADDKPC .S2 ret_from_syscall_trace,B3,3
215 ADD .S1X 8,SP,A4
216
217ret_from_syscall_trace:
218 ;; tracing returns (possibly new) syscall number
219 MV .D2X A4,B0
220 || MVK .S2 __NR_syscalls,B1
221 CMPLTU .L2 B0,B1,B1
222
223 [!B1] BNOP .S2 ret_from_syscall_function,5
224 || MVK .S1 -ENOSYS,A4
225
226 ;; reload syscall args from (possibly modified) stack frame
227 ;; and get syscall handler addr from sys_call_table:
228 LDW .D2T2 *+SP(REGS_B4+8),B4
229 || MVKL .S2 sys_call_table,B1
230 LDW .D2T1 *+SP(REGS_A6+8),A6
231 || MVKH .S2 sys_call_table,B1
232 LDW .D2T2 *+B1[B0],B0
233 || MVKL .S2 ret_from_syscall_function,B3
234 LDW .D2T2 *+SP(REGS_B6+8),B6
235 || MVKH .S2 ret_from_syscall_function,B3
236 LDW .D2T1 *+SP(REGS_A8+8),A8
237 LDW .D2T2 *+SP(REGS_B8+8),B8
238 NOP
239 ; B0 = sys_call_table[__NR_*]
240 BNOP .S2 B0,5 ; branch to syscall handler
241 || LDW .D2T1 *+SP(REGS_ORIG_A4+8),A4
242
243syscall_exit_work:
244 AND .D1 _TIF_SYSCALL_TRACE,A2,A0
245 [!A0] BNOP .S1 work_pending,5
246 [A0] B .S2 syscall_trace_exit
247 ADDKPC .S2 resume_userspace,B3,1
248 MVC .S2 CSR,B1
249 SET .S2 B1,0,0,B1
250 MVC .S2 B1,CSR ; enable ints
251
252work_pending:
253 AND .D1 _TIF_NEED_RESCHED,A2,A0
254 [!A0] BNOP .S1 work_notifysig,5
255
256work_resched:
257#ifdef CONFIG_C6X_BIG_KERNEL
258 MVKL .S1 schedule,A1
259 MVKH .S1 schedule,A1
260 B .S2X A1
261#else
262 B .S2 schedule
263#endif
264 ADDKPC .S2 work_rescheduled,B3,4
265work_rescheduled:
266 ;; make sure we don't miss an interrupt setting need_resched or
267 ;; sigpending between sampling and the rti
268 MASK_INT B2
269 GET_THREAD_INFO A12
270 LDW .D1T1 *+A12(THREAD_INFO_FLAGS),A2
271 MVK .S1 _TIF_WORK_MASK,A1
272 MVK .S1 _TIF_NEED_RESCHED,A3
273 NOP 2
274 AND .D1 A1,A2,A0
275 || AND .S1 A3,A2,A1
276 [!A0] BNOP .S1 restore_all,5
277 [A1] BNOP .S1 work_resched,5
278
279work_notifysig:
280 B .S2 do_notify_resume
281 LDW .D2T1 *+SP(REGS__END+8),A6 ; syscall flag
282 ADDKPC .S2 resume_userspace,B3,1
283 ADD .S1X 8,SP,A4 ; pt_regs pointer is first arg
284 MV .D2X A2,B4 ; thread_info flags is second arg
285
286 ;;
287 ;; On C64x+, the return way from exception and interrupt
288 ;; is a little bit different
289 ;;
290ENTRY(ret_from_exception)
291#ifdef CONFIG_PREEMPT
292 MASK_INT B2
293#endif
294
295ENTRY(ret_from_interrupt)
296 ;;
297 ;; Check if we are comming from user mode.
298 ;;
299 LDW .D2T2 *+SP(REGS_TSR+8),B0
300 MVK .S2 0x40,B1
301 NOP 3
302 AND .D2 B0,B1,B0
303 [!B0] BNOP .S2 resume_kernel,5
304
305resume_userspace:
306 ;; make sure we don't miss an interrupt setting need_resched or
307 ;; sigpending between sampling and the rti
308 MASK_INT B2
309 GET_THREAD_INFO A12
310 LDW .D1T1 *+A12(THREAD_INFO_FLAGS),A2
311 MVK .S1 _TIF_WORK_MASK,A1
312 MVK .S1 _TIF_NEED_RESCHED,A3
313 NOP 2
314 AND .D1 A1,A2,A0
315 [A0] BNOP .S1 work_pending,5
316 BNOP .S1 restore_all,5
317
318 ;;
319 ;; System call handling
320 ;; B0 = syscall number (in sys_call_table)
321 ;; A4,B4,A6,B6,A8,B8 = arguments of the syscall function
322 ;; A4 is the return value register
323 ;;
324system_call_saved:
325 MVK .L2 1,B2
326 STW .D2T2 B2,*+SP(REGS__END+8) ; set syscall flag
327 MVC .S2 B2,ECR ; ack the software exception
328
329 UNMASK_INT B2 ; re-enable global IT
330
331system_call_saved_noack:
332 ;; Check system call number
333 MVK .S2 __NR_syscalls,B1
334#ifdef CONFIG_C6X_BIG_KERNEL
335 || MVKL .S1 sys_ni_syscall,A0
336#endif
337 CMPLTU .L2 B0,B1,B1
338#ifdef CONFIG_C6X_BIG_KERNEL
339 || MVKH .S1 sys_ni_syscall,A0
340#endif
341
342 ;; Check for ptrace
343 GET_THREAD_INFO A12
344
345#ifdef CONFIG_C6X_BIG_KERNEL
346 [!B1] B .S2X A0
347#else
348 [!B1] B .S2 sys_ni_syscall
349#endif
350 [!B1] ADDKPC .S2 ret_from_syscall_function,B3,4
351
352 ;; Get syscall handler addr from sys_call_table
353 ;; call tracesys_on or call syscall handler
354 LDW .D1T1 *+A12(THREAD_INFO_FLAGS),A2
355 || MVKL .S2 sys_call_table,B1
356 MVKH .S2 sys_call_table,B1
357 LDW .D2T2 *+B1[B0],B0
358 NOP 2
359 ; A2 = thread_info flags
360 AND .D1 _TIF_SYSCALL_TRACE,A2,A2
361 [A2] BNOP .S1 tracesys_on,5
362 ;; B0 = _sys_call_table[__NR_*]
363 B .S2 B0
364 ADDKPC .S2 ret_from_syscall_function,B3,4
365
366ret_from_syscall_function:
367 STW .D2T1 A4,*+SP(REGS_A4+8) ; save return value in A4
368 ; original A4 is in orig_A4
369syscall_exit:
370 ;; make sure we don't miss an interrupt setting need_resched or
371 ;; sigpending between sampling and the rti
372 MASK_INT B2
373 LDW .D1T1 *+A12(THREAD_INFO_FLAGS),A2
374 MVK .S1 _TIF_ALLWORK_MASK,A1
375 NOP 3
376 AND .D1 A1,A2,A2 ; check for work to do
377 [A2] BNOP .S1 syscall_exit_work,5
378
379restore_all:
380 RESTORE_ALL NRP,NTSR
381
382 ;;
383 ;; After a fork we jump here directly from resume,
384 ;; so that A4 contains the previous task structure.
385 ;;
386ENTRY(ret_from_fork)
387#ifdef CONFIG_C6X_BIG_KERNEL
388 MVKL .S1 schedule_tail,A0
389 MVKH .S1 schedule_tail,A0
390 B .S2X A0
391#else
392 B .S2 schedule_tail
393#endif
394 ADDKPC .S2 ret_from_fork_2,B3,4
395ret_from_fork_2:
396 ;; return 0 in A4 for child process
397 GET_THREAD_INFO A12
398 BNOP .S2 syscall_exit,3
399 MVK .L2 0,B0
400 STW .D2T2 B0,*+SP(REGS_A4+8)
401ENDPROC(ret_from_fork)
402
403 ;;
404 ;; These are the interrupt handlers, responsible for calling __do_IRQ()
405 ;; int6 is used for syscalls (see _system_call entry)
406 ;;
407 .macro SAVE_ALL_INT
408 SAVE_ALL IRP,ITSR
409 .endm
410
411 .macro CALL_INT int
412#ifdef CONFIG_C6X_BIG_KERNEL
413 MVKL .S1 c6x_do_IRQ,A0
414 MVKH .S1 c6x_do_IRQ,A0
415 BNOP .S2X A0,1
416 MVK .S1 int,A4
417 ADDAW .D2 SP,2,B4
418 MVKL .S2 ret_from_interrupt,B3
419 MVKH .S2 ret_from_interrupt,B3
420#else
421 CALLP .S2 c6x_do_IRQ,B3
422 || MVK .S1 int,A4
423 || ADDAW .D2 SP,2,B4
424 B .S1 ret_from_interrupt
425 NOP 5
426#endif
427 .endm
428
429ENTRY(_int4_handler)
430 SAVE_ALL_INT
431 CALL_INT 4
432ENDPROC(_int4_handler)
433
434ENTRY(_int5_handler)
435 SAVE_ALL_INT
436 CALL_INT 5
437ENDPROC(_int5_handler)
438
439ENTRY(_int6_handler)
440 SAVE_ALL_INT
441 CALL_INT 6
442ENDPROC(_int6_handler)
443
444ENTRY(_int7_handler)
445 SAVE_ALL_INT
446 CALL_INT 7
447ENDPROC(_int7_handler)
448
449ENTRY(_int8_handler)
450 SAVE_ALL_INT
451 CALL_INT 8
452ENDPROC(_int8_handler)
453
454ENTRY(_int9_handler)
455 SAVE_ALL_INT
456 CALL_INT 9
457ENDPROC(_int9_handler)
458
459ENTRY(_int10_handler)
460 SAVE_ALL_INT
461 CALL_INT 10
462ENDPROC(_int10_handler)
463
464ENTRY(_int11_handler)
465 SAVE_ALL_INT
466 CALL_INT 11
467ENDPROC(_int11_handler)
468
469ENTRY(_int12_handler)
470 SAVE_ALL_INT
471 CALL_INT 12
472ENDPROC(_int12_handler)
473
474ENTRY(_int13_handler)
475 SAVE_ALL_INT
476 CALL_INT 13
477ENDPROC(_int13_handler)
478
479ENTRY(_int14_handler)
480 SAVE_ALL_INT
481 CALL_INT 14
482ENDPROC(_int14_handler)
483
484ENTRY(_int15_handler)
485 SAVE_ALL_INT
486 CALL_INT 15
487ENDPROC(_int15_handler)
488
489 ;;
490 ;; Handler for uninitialized and spurious interrupts
491 ;;
492ENTRY(_bad_interrupt)
493 B .S2 IRP
494 NOP 5
495ENDPROC(_bad_interrupt)
496
497 ;;
498 ;; Entry for NMI/exceptions/syscall
499 ;;
500ENTRY(_nmi_handler)
501 SAVE_ALL NRP,NTSR
502
503 MVC .S2 EFR,B2
504 CMPEQ .L2 1,B2,B2
505 || MVC .S2 TSR,B1
506 CLR .S2 B1,10,10,B1
507 MVC .S2 B1,TSR
508#ifdef CONFIG_C6X_BIG_KERNEL
509 [!B2] MVKL .S1 process_exception,A0
510 [!B2] MVKH .S1 process_exception,A0
511 [!B2] B .S2X A0
512#else
513 [!B2] B .S2 process_exception
514#endif
515 [B2] B .S2 system_call_saved
516 [!B2] ADDAW .D2 SP,2,B1
517 [!B2] MV .D1X B1,A4
518 ADDKPC .S2 ret_from_trap,B3,2
519
520ret_from_trap:
521 MV .D2X A4,B0
522 [!B0] BNOP .S2 ret_from_exception,5
523
524#ifdef CONFIG_C6X_BIG_KERNEL
525 MVKL .S2 system_call_saved_noack,B3
526 MVKH .S2 system_call_saved_noack,B3
527#endif
528 LDW .D2T2 *+SP(REGS_B0+8),B0
529 LDW .D2T1 *+SP(REGS_A4+8),A4
530 LDW .D2T2 *+SP(REGS_B4+8),B4
531 LDW .D2T1 *+SP(REGS_A6+8),A6
532 LDW .D2T2 *+SP(REGS_B6+8),B6
533 LDW .D2T1 *+SP(REGS_A8+8),A8
534#ifdef CONFIG_C6X_BIG_KERNEL
535 || B .S2 B3
536#else
537 || B .S2 system_call_saved_noack
538#endif
539 LDW .D2T2 *+SP(REGS_B8+8),B8
540 NOP 4
541ENDPROC(_nmi_handler)
542
543 ;;
544 ;; Jump to schedule() then return to ret_from_isr
545 ;;
546#ifdef CONFIG_PREEMPT
547resume_kernel:
548 GET_THREAD_INFO A12
549 LDW .D1T1 *+A12(THREAD_INFO_PREEMPT_COUNT),A1
550 NOP 4
551 [A1] BNOP .S2 restore_all,5
552
553preempt_schedule:
554 GET_THREAD_INFO A2
555 LDW .D1T1 *+A2(THREAD_INFO_FLAGS),A1
556#ifdef CONFIG_C6X_BIG_KERNEL
557 MVKL .S2 preempt_schedule_irq,B0
558 MVKH .S2 preempt_schedule_irq,B0
559 NOP 2
560#else
561 NOP 4
562#endif
563 AND .D1 _TIF_NEED_RESCHED,A1,A1
564 [!A1] BNOP .S2 restore_all,5
565#ifdef CONFIG_C6X_BIG_KERNEL
566 B .S2 B0
567#else
568 B .S2 preempt_schedule_irq
569#endif
570 ADDKPC .S2 preempt_schedule,B3,4
571#endif /* CONFIG_PREEMPT */
572
573ENTRY(enable_exception)
574 DINT
575 MVC .S2 TSR,B0
576 MVC .S2 B3,NRP
577 MVK .L2 0xc,B1
578 OR .D2 B0,B1,B0
579 MVC .S2 B0,TSR ; Set GEE and XEN in TSR
580 B .S2 NRP
581 NOP 5
582ENDPROC(enable_exception)
583
584ENTRY(sys_sigaltstack)
585#ifdef CONFIG_C6X_BIG_KERNEL
586 MVKL .S1 do_sigaltstack,A0 ; branch to do_sigaltstack
587 MVKH .S1 do_sigaltstack,A0
588 B .S2X A0
589#else
590 B .S2 do_sigaltstack
591#endif
592 LDW .D2T1 *+SP(REGS_SP+8),A6
593 NOP 4
594ENDPROC(sys_sigaltstack)
595
596 ;; kernel_execve
597ENTRY(kernel_execve)
598 MVK .S2 __NR_execve,B0
599 SWE
600 BNOP .S2 B3,5
601ENDPROC(kernel_execve)
602
603 ;;
604 ;; Special system calls
605 ;; return address is in B3
606 ;;
607ENTRY(sys_clone)
608 ADD .D1X SP,8,A4
609#ifdef CONFIG_C6X_BIG_KERNEL
610 || MVKL .S1 sys_c6x_clone,A0
611 MVKH .S1 sys_c6x_clone,A0
612 BNOP .S2X A0,5
613#else
614 || B .S2 sys_c6x_clone
615 NOP 5
616#endif
617ENDPROC(sys_clone)
618
619ENTRY(sys_rt_sigreturn)
620 ADD .D1X SP,8,A4
621#ifdef CONFIG_C6X_BIG_KERNEL
622 || MVKL .S1 do_rt_sigreturn,A0
623 MVKH .S1 do_rt_sigreturn,A0
624 BNOP .S2X A0,5
625#else
626 || B .S2 do_rt_sigreturn
627 NOP 5
628#endif
629ENDPROC(sys_rt_sigreturn)
630
631ENTRY(sys_execve)
632 ADDAW .D2 SP,2,B6 ; put regs addr in 4th parameter
633 ; & adjust regs stack addr
634 LDW .D2T2 *+SP(REGS_B4+8),B4
635
636 ;; c6x_execve(char *name, char **argv,
637 ;; char **envp, struct pt_regs *regs)
638#ifdef CONFIG_C6X_BIG_KERNEL
639 || MVKL .S1 sys_c6x_execve,A0
640 MVKH .S1 sys_c6x_execve,A0
641 B .S2X A0
642#else
643 || B .S2 sys_c6x_execve
644#endif
645 STW .D2T2 B3,*SP--[2]
646 ADDKPC .S2 ret_from_c6x_execve,B3,3
647
648ret_from_c6x_execve:
649 LDW .D2T2 *++SP[2],B3
650 NOP 4
651 BNOP .S2 B3,5
652ENDPROC(sys_execve)
653
654ENTRY(sys_pread_c6x)
655 MV .D2X A8,B7
656#ifdef CONFIG_C6X_BIG_KERNEL
657 || MVKL .S1 sys_pread64,A0
658 MVKH .S1 sys_pread64,A0
659 BNOP .S2X A0,5
660#else
661 || B .S2 sys_pread64
662 NOP 5
663#endif
664ENDPROC(sys_pread_c6x)
665
666ENTRY(sys_pwrite_c6x)
667 MV .D2X A8,B7
668#ifdef CONFIG_C6X_BIG_KERNEL
669 || MVKL .S1 sys_pwrite64,A0
670 MVKH .S1 sys_pwrite64,A0
671 BNOP .S2X A0,5
672#else
673 || B .S2 sys_pwrite64
674 NOP 5
675#endif
676ENDPROC(sys_pwrite_c6x)
677
678;; On Entry
679;; A4 - path
680;; B4 - offset_lo (LE), offset_hi (BE)
681;; A6 - offset_lo (BE), offset_hi (LE)
682ENTRY(sys_truncate64_c6x)
683#ifdef CONFIG_CPU_BIG_ENDIAN
684 MV .S2 B4,B5
685 MV .D2X A6,B4
686#else
687 MV .D2X A6,B5
688#endif
689#ifdef CONFIG_C6X_BIG_KERNEL
690 || MVKL .S1 sys_truncate64,A0
691 MVKH .S1 sys_truncate64,A0
692 BNOP .S2X A0,5
693#else
694 || B .S2 sys_truncate64
695 NOP 5
696#endif
697ENDPROC(sys_truncate64_c6x)
698
699;; On Entry
700;; A4 - fd
701;; B4 - offset_lo (LE), offset_hi (BE)
702;; A6 - offset_lo (BE), offset_hi (LE)
703ENTRY(sys_ftruncate64_c6x)
704#ifdef CONFIG_CPU_BIG_ENDIAN
705 MV .S2 B4,B5
706 MV .D2X A6,B4
707#else
708 MV .D2X A6,B5
709#endif
710#ifdef CONFIG_C6X_BIG_KERNEL
711 || MVKL .S1 sys_ftruncate64,A0
712 MVKH .S1 sys_ftruncate64,A0
713 BNOP .S2X A0,5
714#else
715 || B .S2 sys_ftruncate64
716 NOP 5
717#endif
718ENDPROC(sys_ftruncate64_c6x)
719
720#ifdef __ARCH_WANT_SYSCALL_OFF_T
721;; On Entry
722;; A4 - fd
723;; B4 - offset_lo (LE), offset_hi (BE)
724;; A6 - offset_lo (BE), offset_hi (LE)
725;; B6 - len
726;; A8 - advice
727ENTRY(sys_fadvise64_c6x)
728#ifdef CONFIG_C6X_BIG_KERNEL
729 MVKL .S1 sys_fadvise64,A0
730 MVKH .S1 sys_fadvise64,A0
731 BNOP .S2X A0,2
732#else
733 B .S2 sys_fadvise64
734 NOP 2
735#endif
736#ifdef CONFIG_CPU_BIG_ENDIAN
737 MV .L2 B4,B5
738 || MV .D2X A6,B4
739#else
740 MV .D2X A6,B5
741#endif
742 MV .D1X B6,A6
743 MV .D2X A8,B6
744#endif
745ENDPROC(sys_fadvise64_c6x)
746
747;; On Entry
748;; A4 - fd
749;; B4 - offset_lo (LE), offset_hi (BE)
750;; A6 - offset_lo (BE), offset_hi (LE)
751;; B6 - len_lo (LE), len_hi (BE)
752;; A8 - len_lo (BE), len_hi (LE)
753;; B8 - advice
754ENTRY(sys_fadvise64_64_c6x)
755#ifdef CONFIG_C6X_BIG_KERNEL
756 MVKL .S1 sys_fadvise64_64,A0
757 MVKH .S1 sys_fadvise64_64,A0
758 BNOP .S2X A0,2
759#else
760 B .S2 sys_fadvise64_64
761 NOP 2
762#endif
763#ifdef CONFIG_CPU_BIG_ENDIAN
764 MV .L2 B4,B5
765 || MV .D2X A6,B4
766 MV .L1 A8,A6
767 || MV .D1X B6,A7
768#else
769 MV .D2X A6,B5
770 MV .L1 A8,A7
771 || MV .D1X B6,A6
772#endif
773 MV .L2 B8,B6
774ENDPROC(sys_fadvise64_64_c6x)
775
776;; On Entry
777;; A4 - fd
778;; B4 - mode
779;; A6 - offset_hi
780;; B6 - offset_lo
781;; A8 - len_hi
782;; B8 - len_lo
783ENTRY(sys_fallocate_c6x)
784#ifdef CONFIG_C6X_BIG_KERNEL
785 MVKL .S1 sys_fallocate,A0
786 MVKH .S1 sys_fallocate,A0
787 BNOP .S2X A0,1
788#else
789 B .S2 sys_fallocate
790 NOP
791#endif
792 MV .D1 A6,A7
793 MV .D1X B6,A6
794 MV .D2X A8,B7
795 MV .D2 B8,B6
796ENDPROC(sys_fallocate_c6x)
797
798 ;; put this in .neardata for faster access when using DSBT mode
799 .section .neardata,"aw",@progbits
800 .global current_ksp
801 .hidden current_ksp
802current_ksp:
803 .word init_thread_union + THREAD_START_SP
diff --git a/arch/c6x/kernel/traps.c b/arch/c6x/kernel/traps.c
new file mode 100644
index 000000000000..f50e3edd6dad
--- /dev/null
+++ b/arch/c6x/kernel/traps.c
@@ -0,0 +1,423 @@
1/*
2 * Port on Texas Instruments TMS320C6x architecture
3 *
4 * Copyright (C) 2004, 2006, 2009, 2010, 2011 Texas Instruments Incorporated
5 * Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11#include <linux/module.h>
12#include <linux/ptrace.h>
13#include <linux/kallsyms.h>
14#include <linux/bug.h>
15
16#include <asm/soc.h>
17#include <asm/traps.h>
18
19int (*c6x_nmi_handler)(struct pt_regs *regs);
20
21void __init trap_init(void)
22{
23 ack_exception(EXCEPT_TYPE_NXF);
24 ack_exception(EXCEPT_TYPE_EXC);
25 ack_exception(EXCEPT_TYPE_IXF);
26 ack_exception(EXCEPT_TYPE_SXF);
27 enable_exception();
28}
29
30void show_regs(struct pt_regs *regs)
31{
32 pr_err("\n");
33 pr_err("PC: %08lx SP: %08lx\n", regs->pc, regs->sp);
34 pr_err("Status: %08lx ORIG_A4: %08lx\n", regs->csr, regs->orig_a4);
35 pr_err("A0: %08lx B0: %08lx\n", regs->a0, regs->b0);
36 pr_err("A1: %08lx B1: %08lx\n", regs->a1, regs->b1);
37 pr_err("A2: %08lx B2: %08lx\n", regs->a2, regs->b2);
38 pr_err("A3: %08lx B3: %08lx\n", regs->a3, regs->b3);
39 pr_err("A4: %08lx B4: %08lx\n", regs->a4, regs->b4);
40 pr_err("A5: %08lx B5: %08lx\n", regs->a5, regs->b5);
41 pr_err("A6: %08lx B6: %08lx\n", regs->a6, regs->b6);
42 pr_err("A7: %08lx B7: %08lx\n", regs->a7, regs->b7);
43 pr_err("A8: %08lx B8: %08lx\n", regs->a8, regs->b8);
44 pr_err("A9: %08lx B9: %08lx\n", regs->a9, regs->b9);
45 pr_err("A10: %08lx B10: %08lx\n", regs->a10, regs->b10);
46 pr_err("A11: %08lx B11: %08lx\n", regs->a11, regs->b11);
47 pr_err("A12: %08lx B12: %08lx\n", regs->a12, regs->b12);
48 pr_err("A13: %08lx B13: %08lx\n", regs->a13, regs->b13);
49 pr_err("A14: %08lx B14: %08lx\n", regs->a14, regs->dp);
50 pr_err("A15: %08lx B15: %08lx\n", regs->a15, regs->sp);
51 pr_err("A16: %08lx B16: %08lx\n", regs->a16, regs->b16);
52 pr_err("A17: %08lx B17: %08lx\n", regs->a17, regs->b17);
53 pr_err("A18: %08lx B18: %08lx\n", regs->a18, regs->b18);
54 pr_err("A19: %08lx B19: %08lx\n", regs->a19, regs->b19);
55 pr_err("A20: %08lx B20: %08lx\n", regs->a20, regs->b20);
56 pr_err("A21: %08lx B21: %08lx\n", regs->a21, regs->b21);
57 pr_err("A22: %08lx B22: %08lx\n", regs->a22, regs->b22);
58 pr_err("A23: %08lx B23: %08lx\n", regs->a23, regs->b23);
59 pr_err("A24: %08lx B24: %08lx\n", regs->a24, regs->b24);
60 pr_err("A25: %08lx B25: %08lx\n", regs->a25, regs->b25);
61 pr_err("A26: %08lx B26: %08lx\n", regs->a26, regs->b26);
62 pr_err("A27: %08lx B27: %08lx\n", regs->a27, regs->b27);
63 pr_err("A28: %08lx B28: %08lx\n", regs->a28, regs->b28);
64 pr_err("A29: %08lx B29: %08lx\n", regs->a29, regs->b29);
65 pr_err("A30: %08lx B30: %08lx\n", regs->a30, regs->b30);
66 pr_err("A31: %08lx B31: %08lx\n", regs->a31, regs->b31);
67}
68
69void dump_stack(void)
70{
71 unsigned long stack;
72
73 show_stack(current, &stack);
74}
75EXPORT_SYMBOL(dump_stack);
76
77
78void die(char *str, struct pt_regs *fp, int nr)
79{
80 console_verbose();
81 pr_err("%s: %08x\n", str, nr);
82 show_regs(fp);
83
84 pr_err("Process %s (pid: %d, stackpage=%08lx)\n",
85 current->comm, current->pid, (PAGE_SIZE +
86 (unsigned long) current));
87
88 dump_stack();
89 while (1)
90 ;
91}
92
93static void die_if_kernel(char *str, struct pt_regs *fp, int nr)
94{
95 if (user_mode(fp))
96 return;
97
98 die(str, fp, nr);
99}
100
101
102/* Internal exceptions */
103static struct exception_info iexcept_table[10] = {
104 { "Oops - instruction fetch", SIGBUS, BUS_ADRERR },
105 { "Oops - fetch packet", SIGBUS, BUS_ADRERR },
106 { "Oops - execute packet", SIGILL, ILL_ILLOPC },
107 { "Oops - undefined instruction", SIGILL, ILL_ILLOPC },
108 { "Oops - resource conflict", SIGILL, ILL_ILLOPC },
109 { "Oops - resource access", SIGILL, ILL_PRVREG },
110 { "Oops - privilege", SIGILL, ILL_PRVOPC },
111 { "Oops - loops buffer", SIGILL, ILL_ILLOPC },
112 { "Oops - software exception", SIGILL, ILL_ILLTRP },
113 { "Oops - unknown exception", SIGILL, ILL_ILLOPC }
114};
115
116/* External exceptions */
117static struct exception_info eexcept_table[128] = {
118 { "Oops - external exception", SIGBUS, BUS_ADRERR },
119 { "Oops - external exception", SIGBUS, BUS_ADRERR },
120 { "Oops - external exception", SIGBUS, BUS_ADRERR },
121 { "Oops - external exception", SIGBUS, BUS_ADRERR },
122 { "Oops - external exception", SIGBUS, BUS_ADRERR },
123 { "Oops - external exception", SIGBUS, BUS_ADRERR },
124 { "Oops - external exception", SIGBUS, BUS_ADRERR },
125 { "Oops - external exception", SIGBUS, BUS_ADRERR },
126 { "Oops - external exception", SIGBUS, BUS_ADRERR },
127 { "Oops - external exception", SIGBUS, BUS_ADRERR },
128 { "Oops - external exception", SIGBUS, BUS_ADRERR },
129 { "Oops - external exception", SIGBUS, BUS_ADRERR },
130 { "Oops - external exception", SIGBUS, BUS_ADRERR },
131 { "Oops - external exception", SIGBUS, BUS_ADRERR },
132 { "Oops - external exception", SIGBUS, BUS_ADRERR },
133 { "Oops - external exception", SIGBUS, BUS_ADRERR },
134 { "Oops - external exception", SIGBUS, BUS_ADRERR },
135 { "Oops - external exception", SIGBUS, BUS_ADRERR },
136 { "Oops - external exception", SIGBUS, BUS_ADRERR },
137 { "Oops - external exception", SIGBUS, BUS_ADRERR },
138 { "Oops - external exception", SIGBUS, BUS_ADRERR },
139 { "Oops - external exception", SIGBUS, BUS_ADRERR },
140 { "Oops - external exception", SIGBUS, BUS_ADRERR },
141 { "Oops - external exception", SIGBUS, BUS_ADRERR },
142 { "Oops - external exception", SIGBUS, BUS_ADRERR },
143 { "Oops - external exception", SIGBUS, BUS_ADRERR },
144 { "Oops - external exception", SIGBUS, BUS_ADRERR },
145 { "Oops - external exception", SIGBUS, BUS_ADRERR },
146 { "Oops - external exception", SIGBUS, BUS_ADRERR },
147 { "Oops - external exception", SIGBUS, BUS_ADRERR },
148 { "Oops - external exception", SIGBUS, BUS_ADRERR },
149 { "Oops - external exception", SIGBUS, BUS_ADRERR },
150
151 { "Oops - external exception", SIGBUS, BUS_ADRERR },
152 { "Oops - external exception", SIGBUS, BUS_ADRERR },
153 { "Oops - external exception", SIGBUS, BUS_ADRERR },
154 { "Oops - external exception", SIGBUS, BUS_ADRERR },
155 { "Oops - external exception", SIGBUS, BUS_ADRERR },
156 { "Oops - external exception", SIGBUS, BUS_ADRERR },
157 { "Oops - external exception", SIGBUS, BUS_ADRERR },
158 { "Oops - external exception", SIGBUS, BUS_ADRERR },
159 { "Oops - external exception", SIGBUS, BUS_ADRERR },
160 { "Oops - external exception", SIGBUS, BUS_ADRERR },
161 { "Oops - external exception", SIGBUS, BUS_ADRERR },
162 { "Oops - external exception", SIGBUS, BUS_ADRERR },
163 { "Oops - external exception", SIGBUS, BUS_ADRERR },
164 { "Oops - external exception", SIGBUS, BUS_ADRERR },
165 { "Oops - external exception", SIGBUS, BUS_ADRERR },
166 { "Oops - external exception", SIGBUS, BUS_ADRERR },
167 { "Oops - external exception", SIGBUS, BUS_ADRERR },
168 { "Oops - external exception", SIGBUS, BUS_ADRERR },
169 { "Oops - external exception", SIGBUS, BUS_ADRERR },
170 { "Oops - external exception", SIGBUS, BUS_ADRERR },
171 { "Oops - external exception", SIGBUS, BUS_ADRERR },
172 { "Oops - external exception", SIGBUS, BUS_ADRERR },
173 { "Oops - external exception", SIGBUS, BUS_ADRERR },
174 { "Oops - external exception", SIGBUS, BUS_ADRERR },
175 { "Oops - external exception", SIGBUS, BUS_ADRERR },
176 { "Oops - external exception", SIGBUS, BUS_ADRERR },
177 { "Oops - external exception", SIGBUS, BUS_ADRERR },
178 { "Oops - external exception", SIGBUS, BUS_ADRERR },
179 { "Oops - external exception", SIGBUS, BUS_ADRERR },
180 { "Oops - external exception", SIGBUS, BUS_ADRERR },
181 { "Oops - external exception", SIGBUS, BUS_ADRERR },
182 { "Oops - external exception", SIGBUS, BUS_ADRERR },
183
184 { "Oops - external exception", SIGBUS, BUS_ADRERR },
185 { "Oops - external exception", SIGBUS, BUS_ADRERR },
186 { "Oops - external exception", SIGBUS, BUS_ADRERR },
187 { "Oops - external exception", SIGBUS, BUS_ADRERR },
188 { "Oops - external exception", SIGBUS, BUS_ADRERR },
189 { "Oops - external exception", SIGBUS, BUS_ADRERR },
190 { "Oops - external exception", SIGBUS, BUS_ADRERR },
191 { "Oops - external exception", SIGBUS, BUS_ADRERR },
192 { "Oops - external exception", SIGBUS, BUS_ADRERR },
193 { "Oops - external exception", SIGBUS, BUS_ADRERR },
194 { "Oops - external exception", SIGBUS, BUS_ADRERR },
195 { "Oops - external exception", SIGBUS, BUS_ADRERR },
196 { "Oops - external exception", SIGBUS, BUS_ADRERR },
197 { "Oops - external exception", SIGBUS, BUS_ADRERR },
198 { "Oops - external exception", SIGBUS, BUS_ADRERR },
199 { "Oops - external exception", SIGBUS, BUS_ADRERR },
200 { "Oops - external exception", SIGBUS, BUS_ADRERR },
201 { "Oops - external exception", SIGBUS, BUS_ADRERR },
202 { "Oops - external exception", SIGBUS, BUS_ADRERR },
203 { "Oops - external exception", SIGBUS, BUS_ADRERR },
204 { "Oops - external exception", SIGBUS, BUS_ADRERR },
205 { "Oops - external exception", SIGBUS, BUS_ADRERR },
206 { "Oops - external exception", SIGBUS, BUS_ADRERR },
207 { "Oops - external exception", SIGBUS, BUS_ADRERR },
208 { "Oops - external exception", SIGBUS, BUS_ADRERR },
209 { "Oops - external exception", SIGBUS, BUS_ADRERR },
210 { "Oops - external exception", SIGBUS, BUS_ADRERR },
211 { "Oops - external exception", SIGBUS, BUS_ADRERR },
212 { "Oops - external exception", SIGBUS, BUS_ADRERR },
213 { "Oops - external exception", SIGBUS, BUS_ADRERR },
214 { "Oops - external exception", SIGBUS, BUS_ADRERR },
215 { "Oops - external exception", SIGBUS, BUS_ADRERR },
216
217 { "Oops - external exception", SIGBUS, BUS_ADRERR },
218 { "Oops - external exception", SIGBUS, BUS_ADRERR },
219 { "Oops - external exception", SIGBUS, BUS_ADRERR },
220 { "Oops - external exception", SIGBUS, BUS_ADRERR },
221 { "Oops - external exception", SIGBUS, BUS_ADRERR },
222 { "Oops - external exception", SIGBUS, BUS_ADRERR },
223 { "Oops - external exception", SIGBUS, BUS_ADRERR },
224 { "Oops - external exception", SIGBUS, BUS_ADRERR },
225 { "Oops - external exception", SIGBUS, BUS_ADRERR },
226 { "Oops - external exception", SIGBUS, BUS_ADRERR },
227 { "Oops - external exception", SIGBUS, BUS_ADRERR },
228 { "Oops - external exception", SIGBUS, BUS_ADRERR },
229 { "Oops - external exception", SIGBUS, BUS_ADRERR },
230 { "Oops - external exception", SIGBUS, BUS_ADRERR },
231 { "Oops - external exception", SIGBUS, BUS_ADRERR },
232 { "Oops - external exception", SIGBUS, BUS_ADRERR },
233 { "Oops - external exception", SIGBUS, BUS_ADRERR },
234 { "Oops - external exception", SIGBUS, BUS_ADRERR },
235 { "Oops - external exception", SIGBUS, BUS_ADRERR },
236 { "Oops - external exception", SIGBUS, BUS_ADRERR },
237 { "Oops - external exception", SIGBUS, BUS_ADRERR },
238 { "Oops - external exception", SIGBUS, BUS_ADRERR },
239 { "Oops - external exception", SIGBUS, BUS_ADRERR },
240 { "Oops - CPU memory protection fault", SIGSEGV, SEGV_ACCERR },
241 { "Oops - CPU memory protection fault in L1P", SIGSEGV, SEGV_ACCERR },
242 { "Oops - DMA memory protection fault in L1P", SIGSEGV, SEGV_ACCERR },
243 { "Oops - CPU memory protection fault in L1D", SIGSEGV, SEGV_ACCERR },
244 { "Oops - DMA memory protection fault in L1D", SIGSEGV, SEGV_ACCERR },
245 { "Oops - CPU memory protection fault in L2", SIGSEGV, SEGV_ACCERR },
246 { "Oops - DMA memory protection fault in L2", SIGSEGV, SEGV_ACCERR },
247 { "Oops - EMC CPU memory protection fault", SIGSEGV, SEGV_ACCERR },
248 { "Oops - EMC bus error", SIGBUS, BUS_ADRERR }
249};
250
251static void do_trap(struct exception_info *except_info, struct pt_regs *regs)
252{
253 unsigned long addr = instruction_pointer(regs);
254 siginfo_t info;
255
256 if (except_info->code != TRAP_BRKPT)
257 pr_err("TRAP: %s PC[0x%lx] signo[%d] code[%d]\n",
258 except_info->kernel_str, regs->pc,
259 except_info->signo, except_info->code);
260
261 die_if_kernel(except_info->kernel_str, regs, addr);
262
263 info.si_signo = except_info->signo;
264 info.si_errno = 0;
265 info.si_code = except_info->code;
266 info.si_addr = (void __user *)addr;
267
268 force_sig_info(except_info->signo, &info, current);
269}
270
271/*
272 * Process an internal exception (non maskable)
273 */
274static int process_iexcept(struct pt_regs *regs)
275{
276 unsigned int iexcept_report = get_iexcept();
277 unsigned int iexcept_num;
278
279 ack_exception(EXCEPT_TYPE_IXF);
280
281 pr_err("IEXCEPT: PC[0x%lx]\n", regs->pc);
282
283 while (iexcept_report) {
284 iexcept_num = __ffs(iexcept_report);
285 iexcept_report &= ~(1 << iexcept_num);
286 set_iexcept(iexcept_report);
287 if (*(unsigned int *)regs->pc == BKPT_OPCODE) {
288 /* This is a breakpoint */
289 struct exception_info bkpt_exception = {
290 "Oops - undefined instruction",
291 SIGTRAP, TRAP_BRKPT
292 };
293 do_trap(&bkpt_exception, regs);
294 iexcept_report &= ~(0xFF);
295 set_iexcept(iexcept_report);
296 continue;
297 }
298
299 do_trap(&iexcept_table[iexcept_num], regs);
300 }
301 return 0;
302}
303
304/*
305 * Process an external exception (maskable)
306 */
307static void process_eexcept(struct pt_regs *regs)
308{
309 int evt;
310
311 pr_err("EEXCEPT: PC[0x%lx]\n", regs->pc);
312
313 while ((evt = soc_get_exception()) >= 0)
314 do_trap(&eexcept_table[evt], regs);
315
316 ack_exception(EXCEPT_TYPE_EXC);
317}
318
319/*
320 * Main exception processing
321 */
322asmlinkage int process_exception(struct pt_regs *regs)
323{
324 unsigned int type;
325 unsigned int type_num;
326 unsigned int ie_num = 9; /* default is unknown exception */
327
328 while ((type = get_except_type()) != 0) {
329 type_num = fls(type) - 1;
330
331 switch (type_num) {
332 case EXCEPT_TYPE_NXF:
333 ack_exception(EXCEPT_TYPE_NXF);
334 if (c6x_nmi_handler)
335 (c6x_nmi_handler)(regs);
336 else
337 pr_alert("NMI interrupt!\n");
338 break;
339
340 case EXCEPT_TYPE_IXF:
341 if (process_iexcept(regs))
342 return 1;
343 break;
344
345 case EXCEPT_TYPE_EXC:
346 process_eexcept(regs);
347 break;
348
349 case EXCEPT_TYPE_SXF:
350 ie_num = 8;
351 default:
352 ack_exception(type_num);
353 do_trap(&iexcept_table[ie_num], regs);
354 break;
355 }
356 }
357 return 0;
358}
359
360static int kstack_depth_to_print = 48;
361
362static void show_trace(unsigned long *stack, unsigned long *endstack)
363{
364 unsigned long addr;
365 int i;
366
367 pr_debug("Call trace:");
368 i = 0;
369 while (stack + 1 <= endstack) {
370 addr = *stack++;
371 /*
372 * If the address is either in the text segment of the
373 * kernel, or in the region which contains vmalloc'ed
374 * memory, it *may* be the address of a calling
375 * routine; if so, print it so that someone tracing
376 * down the cause of the crash will be able to figure
377 * out the call path that was taken.
378 */
379 if (__kernel_text_address(addr)) {
380#ifndef CONFIG_KALLSYMS
381 if (i % 5 == 0)
382 pr_debug("\n ");
383#endif
384 pr_debug(" [<%08lx>]", addr);
385 print_symbol(" %s\n", addr);
386 i++;
387 }
388 }
389 pr_debug("\n");
390}
391
392void show_stack(struct task_struct *task, unsigned long *stack)
393{
394 unsigned long *p, *endstack;
395 int i;
396
397 if (!stack) {
398 if (task && task != current)
399 /* We know this is a kernel stack,
400 so this is the start/end */
401 stack = (unsigned long *)thread_saved_ksp(task);
402 else
403 stack = (unsigned long *)&stack;
404 }
405 endstack = (unsigned long *)(((unsigned long)stack + THREAD_SIZE - 1)
406 & -THREAD_SIZE);
407
408 pr_debug("Stack from %08lx:", (unsigned long)stack);
409 for (i = 0, p = stack; i < kstack_depth_to_print; i++) {
410 if (p + 1 > endstack)
411 break;
412 if (i % 8 == 0)
413 pr_cont("\n ");
414 pr_cont(" %08lx", *p++);
415 }
416 pr_cont("\n");
417 show_trace(stack, endstack);
418}
419
420int is_valid_bugaddr(unsigned long addr)
421{
422 return __kernel_text_address(addr);
423}
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-21 04:27:28 -0500