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Linux/arch/metag/kernel/stacktrace.c

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  1 #include <linux/export.h>
  2 #include <linux/sched.h>
  3 #include <linux/sched/debug.h>
  4 #include <linux/sched/task_stack.h>
  5 #include <linux/stacktrace.h>
  6 
  7 #include <asm/stacktrace.h>
  8 
  9 #if defined(CONFIG_FRAME_POINTER)
 10 
 11 #ifdef CONFIG_KALLSYMS
 12 #include <linux/kallsyms.h>
 13 #include <linux/module.h>
 14 
 15 static unsigned long tbi_boing_addr;
 16 static unsigned long tbi_boing_size;
 17 
 18 static void tbi_boing_init(void)
 19 {
 20         /* We need to know where TBIBoingVec is and it's size */
 21         unsigned long size;
 22         unsigned long offset;
 23         char modname[MODULE_NAME_LEN];
 24         char name[KSYM_NAME_LEN];
 25         tbi_boing_addr = kallsyms_lookup_name("___TBIBoingVec");
 26         if (!tbi_boing_addr)
 27                 tbi_boing_addr = 1;
 28         else if (!lookup_symbol_attrs(tbi_boing_addr, &size,
 29                                       &offset, modname, name))
 30                 tbi_boing_size = size;
 31 }
 32 #endif
 33 
 34 /*
 35  * Unwind the current stack frame and store the new register values in the
 36  * structure passed as argument. Unwinding is equivalent to a function return,
 37  * hence the new PC value rather than LR should be used for backtrace.
 38  */
 39 int notrace unwind_frame(struct stackframe *frame)
 40 {
 41         struct metag_frame *fp = (struct metag_frame *)frame->fp;
 42         unsigned long lr;
 43         unsigned long fpnew;
 44 
 45         if (frame->fp & 0x7)
 46                 return -EINVAL;
 47 
 48         fpnew = fp->fp;
 49         lr = fp->lr - 4;
 50 
 51 #ifdef CONFIG_KALLSYMS
 52         /* If we've reached TBIBoingVec then we're at an interrupt
 53          * entry point or a syscall entry point. The frame pointer
 54          * points to a pt_regs which can be used to continue tracing on
 55          * the other side of the boing.
 56          */
 57         if (!tbi_boing_addr)
 58                 tbi_boing_init();
 59         if (tbi_boing_size && lr >= tbi_boing_addr &&
 60             lr < tbi_boing_addr + tbi_boing_size) {
 61                 struct pt_regs *regs = (struct pt_regs *)fpnew;
 62                 if (user_mode(regs))
 63                         return -EINVAL;
 64                 fpnew = regs->ctx.AX[1].U0;
 65                 lr = regs->ctx.DX[4].U1;
 66         }
 67 #endif
 68 
 69         /* stack grows up, so frame pointers must decrease */
 70         if (fpnew < (ALIGN_DOWN((unsigned long)fp, THREAD_SIZE) +
 71                      sizeof(struct thread_info)) || fpnew >= (unsigned long)fp)
 72                 return -EINVAL;
 73 
 74         /* restore the registers from the stack frame */
 75         frame->fp = fpnew;
 76         frame->pc = lr;
 77 
 78         return 0;
 79 }
 80 #else
 81 int notrace unwind_frame(struct stackframe *frame)
 82 {
 83         struct metag_frame *sp = (struct metag_frame *)frame->sp;
 84 
 85         if (frame->sp & 0x7)
 86                 return -EINVAL;
 87 
 88         while (!kstack_end(sp)) {
 89                 unsigned long addr = sp->lr - 4;
 90                 sp--;
 91 
 92                 if (__kernel_text_address(addr)) {
 93                         frame->sp = (unsigned long)sp;
 94                         frame->pc = addr;
 95                         return 0;
 96                 }
 97         }
 98         return -EINVAL;
 99 }
100 #endif
101 
102 void notrace walk_stackframe(struct stackframe *frame,
103                      int (*fn)(struct stackframe *, void *), void *data)
104 {
105         while (1) {
106                 int ret;
107 
108                 if (fn(frame, data))
109                         break;
110                 ret = unwind_frame(frame);
111                 if (ret < 0)
112                         break;
113         }
114 }
115 EXPORT_SYMBOL(walk_stackframe);
116 
117 #ifdef CONFIG_STACKTRACE
118 struct stack_trace_data {
119         struct stack_trace *trace;
120         unsigned int no_sched_functions;
121         unsigned int skip;
122 };
123 
124 static int save_trace(struct stackframe *frame, void *d)
125 {
126         struct stack_trace_data *data = d;
127         struct stack_trace *trace = data->trace;
128         unsigned long addr = frame->pc;
129 
130         if (data->no_sched_functions && in_sched_functions(addr))
131                 return 0;
132         if (data->skip) {
133                 data->skip--;
134                 return 0;
135         }
136 
137         trace->entries[trace->nr_entries++] = addr;
138 
139         return trace->nr_entries >= trace->max_entries;
140 }
141 
142 void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
143 {
144         struct stack_trace_data data;
145         struct stackframe frame;
146 
147         data.trace = trace;
148         data.skip = trace->skip;
149 
150         if (tsk != current) {
151 #ifdef CONFIG_SMP
152                 /*
153                  * What guarantees do we have here that 'tsk' is not
154                  * running on another CPU?  For now, ignore it as we
155                  * can't guarantee we won't explode.
156                  */
157                 if (trace->nr_entries < trace->max_entries)
158                         trace->entries[trace->nr_entries++] = ULONG_MAX;
159                 return;
160 #else
161                 data.no_sched_functions = 1;
162                 frame.fp = thread_saved_fp(tsk);
163                 frame.sp = thread_saved_sp(tsk);
164                 frame.lr = 0;           /* recovered from the stack */
165                 frame.pc = thread_saved_pc(tsk);
166 #endif
167         } else {
168                 register unsigned long current_sp asm ("A0StP");
169 
170                 data.no_sched_functions = 0;
171                 frame.fp = (unsigned long)__builtin_frame_address(0);
172                 frame.sp = current_sp;
173                 frame.lr = (unsigned long)__builtin_return_address(0);
174                 frame.pc = (unsigned long)save_stack_trace_tsk;
175         }
176 
177         walk_stackframe(&frame, save_trace, &data);
178         if (trace->nr_entries < trace->max_entries)
179                 trace->entries[trace->nr_entries++] = ULONG_MAX;
180 }
181 
182 void save_stack_trace(struct stack_trace *trace)
183 {
184         save_stack_trace_tsk(current, trace);
185 }
186 EXPORT_SYMBOL_GPL(save_stack_trace);
187 #endif
188 

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