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-rw-r--r--arch/blackfin/kernel/traps.c875
1 files changed, 40 insertions, 835 deletions
diff --git a/arch/blackfin/kernel/traps.c b/arch/blackfin/kernel/traps.c
index ba70c4bc2699..891cc39f7eec 100644
--- a/arch/blackfin/kernel/traps.c
+++ b/arch/blackfin/kernel/traps.c
@@ -1,20 +1,16 @@
1/* 1/*
2 * Copyright 2004-2009 Analog Devices Inc. 2 * Main exception handling logic.
3 *
4 * Copyright 2004-2010 Analog Devices Inc.
3 * 5 *
4 * Licensed under the GPL-2 or later 6 * Licensed under the GPL-2 or later
5 */ 7 */
6 8
7#include <linux/bug.h> 9#include <linux/bug.h>
8#include <linux/uaccess.h> 10#include <linux/uaccess.h>
9#include <linux/interrupt.h>
10#include <linux/module.h> 11#include <linux/module.h>
11#include <linux/kallsyms.h>
12#include <linux/fs.h>
13#include <linux/rbtree.h>
14#include <asm/traps.h> 12#include <asm/traps.h>
15#include <asm/cacheflush.h>
16#include <asm/cplb.h> 13#include <asm/cplb.h>
17#include <asm/dma.h>
18#include <asm/blackfin.h> 14#include <asm/blackfin.h>
19#include <asm/irq_handler.h> 15#include <asm/irq_handler.h>
20#include <linux/irq.h> 16#include <linux/irq.h>
@@ -62,194 +58,6 @@ void __init trap_init(void)
62 CSYNC(); 58 CSYNC();
63} 59}
64 60
65static void decode_address(char *buf, unsigned long address)
66{
67#ifdef CONFIG_DEBUG_VERBOSE
68 struct task_struct *p;
69 struct mm_struct *mm;
70 unsigned long flags, offset;
71 unsigned char in_atomic = (bfin_read_IPEND() & 0x10) || in_atomic();
72 struct rb_node *n;
73
74#ifdef CONFIG_KALLSYMS
75 unsigned long symsize;
76 const char *symname;
77 char *modname;
78 char *delim = ":";
79 char namebuf[128];
80#endif
81
82 buf += sprintf(buf, "<0x%08lx> ", address);
83
84#ifdef CONFIG_KALLSYMS
85 /* look up the address and see if we are in kernel space */
86 symname = kallsyms_lookup(address, &symsize, &offset, &modname, namebuf);
87
88 if (symname) {
89 /* yeah! kernel space! */
90 if (!modname)
91 modname = delim = "";
92 sprintf(buf, "{ %s%s%s%s + 0x%lx }",
93 delim, modname, delim, symname,
94 (unsigned long)offset);
95 return;
96 }
97#endif
98
99 if (address >= FIXED_CODE_START && address < FIXED_CODE_END) {
100 /* Problem in fixed code section? */
101 strcat(buf, "/* Maybe fixed code section */");
102 return;
103
104 } else if (address < CONFIG_BOOT_LOAD) {
105 /* Problem somewhere before the kernel start address */
106 strcat(buf, "/* Maybe null pointer? */");
107 return;
108
109 } else if (address >= COREMMR_BASE) {
110 strcat(buf, "/* core mmrs */");
111 return;
112
113 } else if (address >= SYSMMR_BASE) {
114 strcat(buf, "/* system mmrs */");
115 return;
116
117 } else if (address >= L1_ROM_START && address < L1_ROM_START + L1_ROM_LENGTH) {
118 strcat(buf, "/* on-chip L1 ROM */");
119 return;
120 }
121
122 /*
123 * Don't walk any of the vmas if we are oopsing, it has been known
124 * to cause problems - corrupt vmas (kernel crashes) cause double faults
125 */
126 if (oops_in_progress) {
127 strcat(buf, "/* kernel dynamic memory (maybe user-space) */");
128 return;
129 }
130
131 /* looks like we're off in user-land, so let's walk all the
132 * mappings of all our processes and see if we can't be a whee
133 * bit more specific
134 */
135 write_lock_irqsave(&tasklist_lock, flags);
136 for_each_process(p) {
137 mm = (in_atomic ? p->mm : get_task_mm(p));
138 if (!mm)
139 continue;
140
141 if (!down_read_trylock(&mm->mmap_sem)) {
142 if (!in_atomic)
143 mmput(mm);
144 continue;
145 }
146
147 for (n = rb_first(&mm->mm_rb); n; n = rb_next(n)) {
148 struct vm_area_struct *vma;
149
150 vma = rb_entry(n, struct vm_area_struct, vm_rb);
151
152 if (address >= vma->vm_start && address < vma->vm_end) {
153 char _tmpbuf[256];
154 char *name = p->comm;
155 struct file *file = vma->vm_file;
156
157 if (file) {
158 char *d_name = d_path(&file->f_path, _tmpbuf,
159 sizeof(_tmpbuf));
160 if (!IS_ERR(d_name))
161 name = d_name;
162 }
163
164 /* FLAT does not have its text aligned to the start of
165 * the map while FDPIC ELF does ...
166 */
167
168 /* before we can check flat/fdpic, we need to
169 * make sure current is valid
170 */
171 if ((unsigned long)current >= FIXED_CODE_START &&
172 !((unsigned long)current & 0x3)) {
173 if (current->mm &&
174 (address > current->mm->start_code) &&
175 (address < current->mm->end_code))
176 offset = address - current->mm->start_code;
177 else
178 offset = (address - vma->vm_start) +
179 (vma->vm_pgoff << PAGE_SHIFT);
180
181 sprintf(buf, "[ %s + 0x%lx ]", name, offset);
182 } else
183 sprintf(buf, "[ %s vma:0x%lx-0x%lx]",
184 name, vma->vm_start, vma->vm_end);
185
186 up_read(&mm->mmap_sem);
187 if (!in_atomic)
188 mmput(mm);
189
190 if (buf[0] == '\0')
191 sprintf(buf, "[ %s ] dynamic memory", name);
192
193 goto done;
194 }
195 }
196
197 up_read(&mm->mmap_sem);
198 if (!in_atomic)
199 mmput(mm);
200 }
201
202 /*
203 * we were unable to find this address anywhere,
204 * or some MMs were skipped because they were in use.
205 */
206 sprintf(buf, "/* kernel dynamic memory */");
207
208done:
209 write_unlock_irqrestore(&tasklist_lock, flags);
210#else
211 sprintf(buf, " ");
212#endif
213}
214
215asmlinkage void double_fault_c(struct pt_regs *fp)
216{
217#ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
218 int j;
219 trace_buffer_save(j);
220#endif
221
222 console_verbose();
223 oops_in_progress = 1;
224#ifdef CONFIG_DEBUG_VERBOSE
225 printk(KERN_EMERG "Double Fault\n");
226#ifdef CONFIG_DEBUG_DOUBLEFAULT_PRINT
227 if (((long)fp->seqstat & SEQSTAT_EXCAUSE) == VEC_UNCOV) {
228 unsigned int cpu = raw_smp_processor_id();
229 char buf[150];
230 decode_address(buf, cpu_pda[cpu].retx_doublefault);
231 printk(KERN_EMERG "While handling exception (EXCAUSE = 0x%x) at %s:\n",
232 (unsigned int)cpu_pda[cpu].seqstat_doublefault & SEQSTAT_EXCAUSE, buf);
233 decode_address(buf, cpu_pda[cpu].dcplb_doublefault_addr);
234 printk(KERN_NOTICE " DCPLB_FAULT_ADDR: %s\n", buf);
235 decode_address(buf, cpu_pda[cpu].icplb_doublefault_addr);
236 printk(KERN_NOTICE " ICPLB_FAULT_ADDR: %s\n", buf);
237
238 decode_address(buf, fp->retx);
239 printk(KERN_NOTICE "The instruction at %s caused a double exception\n", buf);
240 } else
241#endif
242 {
243 dump_bfin_process(fp);
244 dump_bfin_mem(fp);
245 show_regs(fp);
246 dump_bfin_trace_buffer();
247 }
248#endif
249 panic("Double Fault - unrecoverable event");
250
251}
252
253static int kernel_mode_regs(struct pt_regs *regs) 61static int kernel_mode_regs(struct pt_regs *regs)
254{ 62{
255 return regs->ipend & 0xffc0; 63 return regs->ipend & 0xffc0;
@@ -672,659 +480,44 @@ asmlinkage notrace void trap_c(struct pt_regs *fp)
672 trace_buffer_restore(j); 480 trace_buffer_restore(j);
673} 481}
674 482
675/* Typical exception handling routines */ 483asmlinkage void double_fault_c(struct pt_regs *fp)
676
677#define EXPAND_LEN ((1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 256 - 1)
678
679/*
680 * Similar to get_user, do some address checking, then dereference
681 * Return true on success, false on bad address
682 */
683static bool get_instruction(unsigned short *val, unsigned short *address)
684{
685 unsigned long addr = (unsigned long)address;
686
687 /* Check for odd addresses */
688 if (addr & 0x1)
689 return false;
690
691 /* MMR region will never have instructions */
692 if (addr >= SYSMMR_BASE)
693 return false;
694
695 switch (bfin_mem_access_type(addr, 2)) {
696 case BFIN_MEM_ACCESS_CORE:
697 case BFIN_MEM_ACCESS_CORE_ONLY:
698 *val = *address;
699 return true;
700 case BFIN_MEM_ACCESS_DMA:
701 dma_memcpy(val, address, 2);
702 return true;
703 case BFIN_MEM_ACCESS_ITEST:
704 isram_memcpy(val, address, 2);
705 return true;
706 default: /* invalid access */
707 return false;
708 }
709}
710
711/*
712 * decode the instruction if we are printing out the trace, as it
713 * makes things easier to follow, without running it through objdump
714 * These are the normal instructions which cause change of flow, which
715 * would be at the source of the trace buffer
716 */
717#if defined(CONFIG_DEBUG_VERBOSE) && defined(CONFIG_DEBUG_BFIN_HWTRACE_ON)
718static void decode_instruction(unsigned short *address)
719{
720 unsigned short opcode;
721
722 if (get_instruction(&opcode, address)) {
723 if (opcode == 0x0010)
724 verbose_printk("RTS");
725 else if (opcode == 0x0011)
726 verbose_printk("RTI");
727 else if (opcode == 0x0012)
728 verbose_printk("RTX");
729 else if (opcode == 0x0013)
730 verbose_printk("RTN");
731 else if (opcode == 0x0014)
732 verbose_printk("RTE");
733 else if (opcode == 0x0025)
734 verbose_printk("EMUEXCPT");
735 else if (opcode >= 0x0040 && opcode <= 0x0047)
736 verbose_printk("STI R%i", opcode & 7);
737 else if (opcode >= 0x0050 && opcode <= 0x0057)
738 verbose_printk("JUMP (P%i)", opcode & 7);
739 else if (opcode >= 0x0060 && opcode <= 0x0067)
740 verbose_printk("CALL (P%i)", opcode & 7);
741 else if (opcode >= 0x0070 && opcode <= 0x0077)
742 verbose_printk("CALL (PC+P%i)", opcode & 7);
743 else if (opcode >= 0x0080 && opcode <= 0x0087)
744 verbose_printk("JUMP (PC+P%i)", opcode & 7);
745 else if (opcode >= 0x0090 && opcode <= 0x009F)
746 verbose_printk("RAISE 0x%x", opcode & 0xF);
747 else if (opcode >= 0x00A0 && opcode <= 0x00AF)
748 verbose_printk("EXCPT 0x%x", opcode & 0xF);
749 else if ((opcode >= 0x1000 && opcode <= 0x13FF) || (opcode >= 0x1800 && opcode <= 0x1BFF))
750 verbose_printk("IF !CC JUMP");
751 else if ((opcode >= 0x1400 && opcode <= 0x17ff) || (opcode >= 0x1c00 && opcode <= 0x1fff))
752 verbose_printk("IF CC JUMP");
753 else if (opcode >= 0x2000 && opcode <= 0x2fff)
754 verbose_printk("JUMP.S");
755 else if (opcode >= 0xe080 && opcode <= 0xe0ff)
756 verbose_printk("LSETUP");
757 else if (opcode >= 0xe200 && opcode <= 0xe2ff)
758 verbose_printk("JUMP.L");
759 else if (opcode >= 0xe300 && opcode <= 0xe3ff)
760 verbose_printk("CALL pcrel");
761 else
762 verbose_printk("0x%04x", opcode);
763 }
764
765}
766#endif
767
768void dump_bfin_trace_buffer(void)
769{
770#ifdef CONFIG_DEBUG_VERBOSE
771#ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
772 int tflags, i = 0;
773 char buf[150];
774 unsigned short *addr;
775#ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
776 int j, index;
777#endif
778
779 trace_buffer_save(tflags);
780
781 printk(KERN_NOTICE "Hardware Trace:\n");
782
783#ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
784 printk(KERN_NOTICE "WARNING: Expanded trace turned on - can not trace exceptions\n");
785#endif
786
787 if (likely(bfin_read_TBUFSTAT() & TBUFCNT)) {
788 for (; bfin_read_TBUFSTAT() & TBUFCNT; i++) {
789 decode_address(buf, (unsigned long)bfin_read_TBUF());
790 printk(KERN_NOTICE "%4i Target : %s\n", i, buf);
791 addr = (unsigned short *)bfin_read_TBUF();
792 decode_address(buf, (unsigned long)addr);
793 printk(KERN_NOTICE " Source : %s ", buf);
794 decode_instruction(addr);
795 printk("\n");
796 }
797 }
798
799#ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
800 if (trace_buff_offset)
801 index = trace_buff_offset / 4;
802 else
803 index = EXPAND_LEN;
804
805 j = (1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 128;
806 while (j) {
807 decode_address(buf, software_trace_buff[index]);
808 printk(KERN_NOTICE "%4i Target : %s\n", i, buf);
809 index -= 1;
810 if (index < 0 )
811 index = EXPAND_LEN;
812 decode_address(buf, software_trace_buff[index]);
813 printk(KERN_NOTICE " Source : %s ", buf);
814 decode_instruction((unsigned short *)software_trace_buff[index]);
815 printk("\n");
816 index -= 1;
817 if (index < 0)
818 index = EXPAND_LEN;
819 j--;
820 i++;
821 }
822#endif
823
824 trace_buffer_restore(tflags);
825#endif
826#endif
827}
828EXPORT_SYMBOL(dump_bfin_trace_buffer);
829
830#ifdef CONFIG_BUG
831int is_valid_bugaddr(unsigned long addr)
832{
833 unsigned short opcode;
834
835 if (!get_instruction(&opcode, (unsigned short *)addr))
836 return 0;
837
838 return opcode == BFIN_BUG_OPCODE;
839}
840#endif
841
842/*
843 * Checks to see if the address pointed to is either a
844 * 16-bit CALL instruction, or a 32-bit CALL instruction
845 */
846static bool is_bfin_call(unsigned short *addr)
847{
848 unsigned short opcode = 0, *ins_addr;
849 ins_addr = (unsigned short *)addr;
850
851 if (!get_instruction(&opcode, ins_addr))
852 return false;
853
854 if ((opcode >= 0x0060 && opcode <= 0x0067) ||
855 (opcode >= 0x0070 && opcode <= 0x0077))
856 return true;
857
858 ins_addr--;
859 if (!get_instruction(&opcode, ins_addr))
860 return false;
861
862 if (opcode >= 0xE300 && opcode <= 0xE3FF)
863 return true;
864
865 return false;
866
867}
868
869void show_stack(struct task_struct *task, unsigned long *stack)
870{
871#ifdef CONFIG_PRINTK
872 unsigned int *addr, *endstack, *fp = 0, *frame;
873 unsigned short *ins_addr;
874 char buf[150];
875 unsigned int i, j, ret_addr, frame_no = 0;
876
877 /*
878 * If we have been passed a specific stack, use that one otherwise
879 * if we have been passed a task structure, use that, otherwise
880 * use the stack of where the variable "stack" exists
881 */
882
883 if (stack == NULL) {
884 if (task) {
885 /* We know this is a kernel stack, so this is the start/end */
886 stack = (unsigned long *)task->thread.ksp;
887 endstack = (unsigned int *)(((unsigned int)(stack) & ~(THREAD_SIZE - 1)) + THREAD_SIZE);
888 } else {
889 /* print out the existing stack info */
890 stack = (unsigned long *)&stack;
891 endstack = (unsigned int *)PAGE_ALIGN((unsigned int)stack);
892 }
893 } else
894 endstack = (unsigned int *)PAGE_ALIGN((unsigned int)stack);
895
896 printk(KERN_NOTICE "Stack info:\n");
897 decode_address(buf, (unsigned int)stack);
898 printk(KERN_NOTICE " SP: [0x%p] %s\n", stack, buf);
899
900 if (!access_ok(VERIFY_READ, stack, (unsigned int)endstack - (unsigned int)stack)) {
901 printk(KERN_NOTICE "Invalid stack pointer\n");
902 return;
903 }
904
905 /* First thing is to look for a frame pointer */
906 for (addr = (unsigned int *)((unsigned int)stack & ~0xF); addr < endstack; addr++) {
907 if (*addr & 0x1)
908 continue;
909 ins_addr = (unsigned short *)*addr;
910 ins_addr--;
911 if (is_bfin_call(ins_addr))
912 fp = addr - 1;
913
914 if (fp) {
915 /* Let's check to see if it is a frame pointer */
916 while (fp >= (addr - 1) && fp < endstack
917 && fp && ((unsigned int) fp & 0x3) == 0)
918 fp = (unsigned int *)*fp;
919 if (fp == 0 || fp == endstack) {
920 fp = addr - 1;
921 break;
922 }
923 fp = 0;
924 }
925 }
926 if (fp) {
927 frame = fp;
928 printk(KERN_NOTICE " FP: (0x%p)\n", fp);
929 } else
930 frame = 0;
931
932 /*
933 * Now that we think we know where things are, we
934 * walk the stack again, this time printing things out
935 * incase there is no frame pointer, we still look for
936 * valid return addresses
937 */
938
939 /* First time print out data, next time, print out symbols */
940 for (j = 0; j <= 1; j++) {
941 if (j)
942 printk(KERN_NOTICE "Return addresses in stack:\n");
943 else
944 printk(KERN_NOTICE " Memory from 0x%08lx to %p", ((long unsigned int)stack & ~0xF), endstack);
945
946 fp = frame;
947 frame_no = 0;
948
949 for (addr = (unsigned int *)((unsigned int)stack & ~0xF), i = 0;
950 addr < endstack; addr++, i++) {
951
952 ret_addr = 0;
953 if (!j && i % 8 == 0)
954 printk(KERN_NOTICE "%p:",addr);
955
956 /* if it is an odd address, or zero, just skip it */
957 if (*addr & 0x1 || !*addr)
958 goto print;
959
960 ins_addr = (unsigned short *)*addr;
961
962 /* Go back one instruction, and see if it is a CALL */
963 ins_addr--;
964 ret_addr = is_bfin_call(ins_addr);
965 print:
966 if (!j && stack == (unsigned long *)addr)
967 printk("[%08x]", *addr);
968 else if (ret_addr)
969 if (j) {
970 decode_address(buf, (unsigned int)*addr);
971 if (frame == addr) {
972 printk(KERN_NOTICE " frame %2i : %s\n", frame_no, buf);
973 continue;
974 }
975 printk(KERN_NOTICE " address : %s\n", buf);
976 } else
977 printk("<%08x>", *addr);
978 else if (fp == addr) {
979 if (j)
980 frame = addr+1;
981 else
982 printk("(%08x)", *addr);
983
984 fp = (unsigned int *)*addr;
985 frame_no++;
986
987 } else if (!j)
988 printk(" %08x ", *addr);
989 }
990 if (!j)
991 printk("\n");
992 }
993#endif
994}
995EXPORT_SYMBOL(show_stack);
996
997void dump_stack(void)
998{ 484{
999 unsigned long stack;
1000#ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON 485#ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
1001 int tflags; 486 int j;
487 trace_buffer_save(j);
1002#endif 488#endif
1003 trace_buffer_save(tflags);
1004 dump_bfin_trace_buffer();
1005 show_stack(current, &stack);
1006 trace_buffer_restore(tflags);
1007}
1008EXPORT_SYMBOL(dump_stack);
1009 489
1010void dump_bfin_process(struct pt_regs *fp) 490 console_verbose();
1011{ 491 oops_in_progress = 1;
1012#ifdef CONFIG_DEBUG_VERBOSE 492#ifdef CONFIG_DEBUG_VERBOSE
1013 /* We should be able to look at fp->ipend, but we don't push it on the 493 printk(KERN_EMERG "Double Fault\n");
1014 * stack all the time, so do this until we fix that */ 494#ifdef CONFIG_DEBUG_DOUBLEFAULT_PRINT
1015 unsigned int context = bfin_read_IPEND(); 495 if (((long)fp->seqstat & SEQSTAT_EXCAUSE) == VEC_UNCOV) {
1016 496 unsigned int cpu = raw_smp_processor_id();
1017 if (oops_in_progress) 497 char buf[150];
1018 verbose_printk(KERN_EMERG "Kernel OOPS in progress\n"); 498 decode_address(buf, cpu_pda[cpu].retx_doublefault);
1019 499 printk(KERN_EMERG "While handling exception (EXCAUSE = 0x%x) at %s:\n",
1020 if (context & 0x0020 && (fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR) 500 (unsigned int)cpu_pda[cpu].seqstat_doublefault & SEQSTAT_EXCAUSE, buf);
1021 verbose_printk(KERN_NOTICE "HW Error context\n"); 501 decode_address(buf, cpu_pda[cpu].dcplb_doublefault_addr);
1022 else if (context & 0x0020) 502 printk(KERN_NOTICE " DCPLB_FAULT_ADDR: %s\n", buf);
1023 verbose_printk(KERN_NOTICE "Deferred Exception context\n"); 503 decode_address(buf, cpu_pda[cpu].icplb_doublefault_addr);
1024 else if (context & 0x3FC0) 504 printk(KERN_NOTICE " ICPLB_FAULT_ADDR: %s\n", buf);
1025 verbose_printk(KERN_NOTICE "Interrupt context\n");
1026 else if (context & 0x4000)
1027 verbose_printk(KERN_NOTICE "Deferred Interrupt context\n");
1028 else if (context & 0x8000)
1029 verbose_printk(KERN_NOTICE "Kernel process context\n");
1030
1031 /* Because we are crashing, and pointers could be bad, we check things
1032 * pretty closely before we use them
1033 */
1034 if ((unsigned long)current >= FIXED_CODE_START &&
1035 !((unsigned long)current & 0x3) && current->pid) {
1036 verbose_printk(KERN_NOTICE "CURRENT PROCESS:\n");
1037 if (current->comm >= (char *)FIXED_CODE_START)
1038 verbose_printk(KERN_NOTICE "COMM=%s PID=%d",
1039 current->comm, current->pid);
1040 else
1041 verbose_printk(KERN_NOTICE "COMM= invalid");
1042 505
1043 printk(KERN_CONT " CPU=%d\n", current_thread_info()->cpu); 506 decode_address(buf, fp->retx);
1044 if (!((unsigned long)current->mm & 0x3) && (unsigned long)current->mm >= FIXED_CODE_START) 507 printk(KERN_NOTICE "The instruction at %s caused a double exception\n", buf);
1045 verbose_printk(KERN_NOTICE
1046 "TEXT = 0x%p-0x%p DATA = 0x%p-0x%p\n"
1047 " BSS = 0x%p-0x%p USER-STACK = 0x%p\n\n",
1048 (void *)current->mm->start_code,
1049 (void *)current->mm->end_code,
1050 (void *)current->mm->start_data,
1051 (void *)current->mm->end_data,
1052 (void *)current->mm->end_data,
1053 (void *)current->mm->brk,
1054 (void *)current->mm->start_stack);
1055 else
1056 verbose_printk(KERN_NOTICE "invalid mm\n");
1057 } else 508 } else
1058 verbose_printk(KERN_NOTICE
1059 "No Valid process in current context\n");
1060#endif
1061}
1062
1063void dump_bfin_mem(struct pt_regs *fp)
1064{
1065#ifdef CONFIG_DEBUG_VERBOSE
1066 unsigned short *addr, *erraddr, val = 0, err = 0;
1067 char sti = 0, buf[6];
1068
1069 erraddr = (void *)fp->pc;
1070
1071 verbose_printk(KERN_NOTICE "return address: [0x%p]; contents of:", erraddr);
1072
1073 for (addr = (unsigned short *)((unsigned long)erraddr & ~0xF) - 0x10;
1074 addr < (unsigned short *)((unsigned long)erraddr & ~0xF) + 0x10;
1075 addr++) {
1076 if (!((unsigned long)addr & 0xF))
1077 verbose_printk(KERN_NOTICE "0x%p: ", addr);
1078
1079 if (!get_instruction(&val, addr)) {
1080 val = 0;
1081 sprintf(buf, "????");
1082 } else
1083 sprintf(buf, "%04x", val);
1084
1085 if (addr == erraddr) {
1086 verbose_printk("[%s]", buf);
1087 err = val;
1088 } else
1089 verbose_printk(" %s ", buf);
1090
1091 /* Do any previous instructions turn on interrupts? */
1092 if (addr <= erraddr && /* in the past */
1093 ((val >= 0x0040 && val <= 0x0047) || /* STI instruction */
1094 val == 0x017b)) /* [SP++] = RETI */
1095 sti = 1;
1096 }
1097
1098 verbose_printk("\n");
1099
1100 /* Hardware error interrupts can be deferred */
1101 if (unlikely(sti && (fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR &&
1102 oops_in_progress)){
1103 verbose_printk(KERN_NOTICE "Looks like this was a deferred error - sorry\n");
1104#ifndef CONFIG_DEBUG_HWERR
1105 verbose_printk(KERN_NOTICE
1106"The remaining message may be meaningless\n"
1107"You should enable CONFIG_DEBUG_HWERR to get a better idea where it came from\n");
1108#else
1109 /* If we are handling only one peripheral interrupt
1110 * and current mm and pid are valid, and the last error
1111 * was in that user space process's text area
1112 * print it out - because that is where the problem exists
1113 */
1114 if ((!(((fp)->ipend & ~0x30) & (((fp)->ipend & ~0x30) - 1))) &&
1115 (current->pid && current->mm)) {
1116 /* And the last RETI points to the current userspace context */
1117 if ((fp + 1)->pc >= current->mm->start_code &&
1118 (fp + 1)->pc <= current->mm->end_code) {
1119 verbose_printk(KERN_NOTICE "It might be better to look around here :\n");
1120 verbose_printk(KERN_NOTICE "-------------------------------------------\n");
1121 show_regs(fp + 1);
1122 verbose_printk(KERN_NOTICE "-------------------------------------------\n");
1123 }
1124 }
1125#endif
1126 }
1127#endif
1128}
1129
1130void show_regs(struct pt_regs *fp)
1131{
1132#ifdef CONFIG_DEBUG_VERBOSE
1133 char buf [150];
1134 struct irqaction *action;
1135 unsigned int i;
1136 unsigned long flags = 0;
1137 unsigned int cpu = raw_smp_processor_id();
1138 unsigned char in_atomic = (bfin_read_IPEND() & 0x10) || in_atomic();
1139
1140 verbose_printk(KERN_NOTICE "\n");
1141 if (CPUID != bfin_cpuid())
1142 verbose_printk(KERN_NOTICE "Compiled for cpu family 0x%04x (Rev %d), "
1143 "but running on:0x%04x (Rev %d)\n",
1144 CPUID, bfin_compiled_revid(), bfin_cpuid(), bfin_revid());
1145
1146 verbose_printk(KERN_NOTICE "ADSP-%s-0.%d",
1147 CPU, bfin_compiled_revid());
1148
1149 if (bfin_compiled_revid() != bfin_revid())
1150 verbose_printk("(Detected 0.%d)", bfin_revid());
1151
1152 verbose_printk(" %lu(MHz CCLK) %lu(MHz SCLK) (%s)\n",
1153 get_cclk()/1000000, get_sclk()/1000000,
1154#ifdef CONFIG_MPU
1155 "mpu on"
1156#else
1157 "mpu off"
1158#endif 509#endif
1159 ); 510 {
1160 511 dump_bfin_process(fp);
1161 verbose_printk(KERN_NOTICE "%s", linux_banner); 512 dump_bfin_mem(fp);
1162 513 show_regs(fp);
1163 verbose_printk(KERN_NOTICE "\nSEQUENCER STATUS:\t\t%s\n", print_tainted()); 514 dump_bfin_trace_buffer();
1164 verbose_printk(KERN_NOTICE " SEQSTAT: %08lx IPEND: %04lx IMASK: %04lx SYSCFG: %04lx\n",
1165 (long)fp->seqstat, fp->ipend, cpu_pda[raw_smp_processor_id()].ex_imask, fp->syscfg);
1166 if (fp->ipend & EVT_IRPTEN)
1167 verbose_printk(KERN_NOTICE " Global Interrupts Disabled (IPEND[4])\n");
1168 if (!(cpu_pda[raw_smp_processor_id()].ex_imask & (EVT_IVG13 | EVT_IVG12 | EVT_IVG11 |
1169 EVT_IVG10 | EVT_IVG9 | EVT_IVG8 | EVT_IVG7 | EVT_IVTMR)))
1170 verbose_printk(KERN_NOTICE " Peripheral interrupts masked off\n");
1171 if (!(cpu_pda[raw_smp_processor_id()].ex_imask & (EVT_IVG15 | EVT_IVG14)))
1172 verbose_printk(KERN_NOTICE " Kernel interrupts masked off\n");
1173 if ((fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR) {
1174 verbose_printk(KERN_NOTICE " HWERRCAUSE: 0x%lx\n",
1175 (fp->seqstat & SEQSTAT_HWERRCAUSE) >> 14);
1176#ifdef EBIU_ERRMST
1177 /* If the error was from the EBIU, print it out */
1178 if (bfin_read_EBIU_ERRMST() & CORE_ERROR) {
1179 verbose_printk(KERN_NOTICE " EBIU Error Reason : 0x%04x\n",
1180 bfin_read_EBIU_ERRMST());
1181 verbose_printk(KERN_NOTICE " EBIU Error Address : 0x%08x\n",
1182 bfin_read_EBIU_ERRADD());
1183 }
1184#endif
1185 }
1186 verbose_printk(KERN_NOTICE " EXCAUSE : 0x%lx\n",
1187 fp->seqstat & SEQSTAT_EXCAUSE);
1188 for (i = 2; i <= 15 ; i++) {
1189 if (fp->ipend & (1 << i)) {
1190 if (i != 4) {
1191 decode_address(buf, bfin_read32(EVT0 + 4*i));
1192 verbose_printk(KERN_NOTICE " physical IVG%i asserted : %s\n", i, buf);
1193 } else
1194 verbose_printk(KERN_NOTICE " interrupts disabled\n");
1195 }
1196 }
1197
1198 /* if no interrupts are going off, don't print this out */
1199 if (fp->ipend & ~0x3F) {
1200 for (i = 0; i < (NR_IRQS - 1); i++) {
1201 if (!in_atomic)
1202 raw_spin_lock_irqsave(&irq_desc[i].lock, flags);
1203
1204 action = irq_desc[i].action;
1205 if (!action)
1206 goto unlock;
1207
1208 decode_address(buf, (unsigned int)action->handler);
1209 verbose_printk(KERN_NOTICE " logical irq %3d mapped : %s", i, buf);
1210 for (action = action->next; action; action = action->next) {
1211 decode_address(buf, (unsigned int)action->handler);
1212 verbose_printk(", %s", buf);
1213 }
1214 verbose_printk("\n");
1215unlock:
1216 if (!in_atomic)
1217 raw_spin_unlock_irqrestore(&irq_desc[i].lock, flags);
1218 }
1219 }
1220
1221 decode_address(buf, fp->rete);
1222 verbose_printk(KERN_NOTICE " RETE: %s\n", buf);
1223 decode_address(buf, fp->retn);
1224 verbose_printk(KERN_NOTICE " RETN: %s\n", buf);
1225 decode_address(buf, fp->retx);
1226 verbose_printk(KERN_NOTICE " RETX: %s\n", buf);
1227 decode_address(buf, fp->rets);
1228 verbose_printk(KERN_NOTICE " RETS: %s\n", buf);
1229 decode_address(buf, fp->pc);
1230 verbose_printk(KERN_NOTICE " PC : %s\n", buf);
1231
1232 if (((long)fp->seqstat & SEQSTAT_EXCAUSE) &&
1233 (((long)fp->seqstat & SEQSTAT_EXCAUSE) != VEC_HWERR)) {
1234 decode_address(buf, cpu_pda[cpu].dcplb_fault_addr);
1235 verbose_printk(KERN_NOTICE "DCPLB_FAULT_ADDR: %s\n", buf);
1236 decode_address(buf, cpu_pda[cpu].icplb_fault_addr);
1237 verbose_printk(KERN_NOTICE "ICPLB_FAULT_ADDR: %s\n", buf);
1238 } 515 }
1239
1240 verbose_printk(KERN_NOTICE "PROCESSOR STATE:\n");
1241 verbose_printk(KERN_NOTICE " R0 : %08lx R1 : %08lx R2 : %08lx R3 : %08lx\n",
1242 fp->r0, fp->r1, fp->r2, fp->r3);
1243 verbose_printk(KERN_NOTICE " R4 : %08lx R5 : %08lx R6 : %08lx R7 : %08lx\n",
1244 fp->r4, fp->r5, fp->r6, fp->r7);
1245 verbose_printk(KERN_NOTICE " P0 : %08lx P1 : %08lx P2 : %08lx P3 : %08lx\n",
1246 fp->p0, fp->p1, fp->p2, fp->p3);
1247 verbose_printk(KERN_NOTICE " P4 : %08lx P5 : %08lx FP : %08lx SP : %08lx\n",
1248 fp->p4, fp->p5, fp->fp, (long)fp);
1249 verbose_printk(KERN_NOTICE " LB0: %08lx LT0: %08lx LC0: %08lx\n",
1250 fp->lb0, fp->lt0, fp->lc0);
1251 verbose_printk(KERN_NOTICE " LB1: %08lx LT1: %08lx LC1: %08lx\n",
1252 fp->lb1, fp->lt1, fp->lc1);
1253 verbose_printk(KERN_NOTICE " B0 : %08lx L0 : %08lx M0 : %08lx I0 : %08lx\n",
1254 fp->b0, fp->l0, fp->m0, fp->i0);
1255 verbose_printk(KERN_NOTICE " B1 : %08lx L1 : %08lx M1 : %08lx I1 : %08lx\n",
1256 fp->b1, fp->l1, fp->m1, fp->i1);
1257 verbose_printk(KERN_NOTICE " B2 : %08lx L2 : %08lx M2 : %08lx I2 : %08lx\n",
1258 fp->b2, fp->l2, fp->m2, fp->i2);
1259 verbose_printk(KERN_NOTICE " B3 : %08lx L3 : %08lx M3 : %08lx I3 : %08lx\n",
1260 fp->b3, fp->l3, fp->m3, fp->i3);
1261 verbose_printk(KERN_NOTICE "A0.w: %08lx A0.x: %08lx A1.w: %08lx A1.x: %08lx\n",
1262 fp->a0w, fp->a0x, fp->a1w, fp->a1x);
1263
1264 verbose_printk(KERN_NOTICE "USP : %08lx ASTAT: %08lx\n",
1265 rdusp(), fp->astat);
1266
1267 verbose_printk(KERN_NOTICE "\n");
1268#endif
1269}
1270
1271#ifdef CONFIG_SYS_BFIN_SPINLOCK_L1
1272asmlinkage int sys_bfin_spinlock(int *spinlock)__attribute__((l1_text));
1273#endif 516#endif
517 panic("Double Fault - unrecoverable event");
1274 518
1275static DEFINE_SPINLOCK(bfin_spinlock_lock);
1276
1277asmlinkage int sys_bfin_spinlock(int *p)
1278{
1279 int ret, tmp = 0;
1280
1281 spin_lock(&bfin_spinlock_lock); /* This would also hold kernel preemption. */
1282 ret = get_user(tmp, p);
1283 if (likely(ret == 0)) {
1284 if (unlikely(tmp))
1285 ret = 1;
1286 else
1287 put_user(1, p);
1288 }
1289 spin_unlock(&bfin_spinlock_lock);
1290 return ret;
1291} 519}
1292 520
1293int bfin_request_exception(unsigned int exception, void (*handler)(void))
1294{
1295 void (*curr_handler)(void);
1296
1297 if (exception > 0x3F)
1298 return -EINVAL;
1299
1300 curr_handler = ex_table[exception];
1301
1302 if (curr_handler != ex_replaceable)
1303 return -EBUSY;
1304
1305 ex_table[exception] = handler;
1306
1307 return 0;
1308}
1309EXPORT_SYMBOL(bfin_request_exception);
1310
1311int bfin_free_exception(unsigned int exception, void (*handler)(void))
1312{
1313 void (*curr_handler)(void);
1314
1315 if (exception > 0x3F)
1316 return -EINVAL;
1317
1318 curr_handler = ex_table[exception];
1319
1320 if (curr_handler != handler)
1321 return -EBUSY;
1322
1323 ex_table[exception] = ex_replaceable;
1324
1325 return 0;
1326}
1327EXPORT_SYMBOL(bfin_free_exception);
1328 521
1329void panic_cplb_error(int cplb_panic, struct pt_regs *fp) 522void panic_cplb_error(int cplb_panic, struct pt_regs *fp)
1330{ 523{
@@ -1349,3 +542,15 @@ void panic_cplb_error(int cplb_panic, struct pt_regs *fp)
1349 dump_stack(); 542 dump_stack();
1350 panic("Unrecoverable event"); 543 panic("Unrecoverable event");
1351} 544}
545
546#ifdef CONFIG_BUG
547int is_valid_bugaddr(unsigned long addr)
548{
549 unsigned short opcode;
550
551 if (!get_instruction(&opcode, (unsigned short *)addr))
552 return 0;
553
554 return opcode == BFIN_BUG_OPCODE;
555}
556#endif
generated by cgit v1.2.2 (git 2.25.0) at 2025-09-11 12:03:51 -0400