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TOMOYO Linux Cross Reference
Linux/arch/x86/kernel/unwind_guess.c

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  1 #include <linux/sched.h>
  2 #include <linux/ftrace.h>
  3 #include <asm/ptrace.h>
  4 #include <asm/bitops.h>
  5 #include <asm/stacktrace.h>
  6 #include <asm/unwind.h>
  7 
  8 unsigned long unwind_get_return_address(struct unwind_state *state)
  9 {
 10         unsigned long addr;
 11 
 12         if (unwind_done(state))
 13                 return 0;
 14 
 15         addr = READ_ONCE_NOCHECK(*state->sp);
 16 
 17         return ftrace_graph_ret_addr(state->task, &state->graph_idx,
 18                                      addr, state->sp);
 19 }
 20 EXPORT_SYMBOL_GPL(unwind_get_return_address);
 21 
 22 unsigned long *unwind_get_return_address_ptr(struct unwind_state *state)
 23 {
 24         return NULL;
 25 }
 26 
 27 bool unwind_next_frame(struct unwind_state *state)
 28 {
 29         struct stack_info *info = &state->stack_info;
 30 
 31         if (unwind_done(state))
 32                 return false;
 33 
 34         do {
 35                 for (state->sp++; state->sp < info->end; state->sp++) {
 36                         unsigned long addr = READ_ONCE_NOCHECK(*state->sp);
 37 
 38                         if (__kernel_text_address(addr))
 39                                 return true;
 40                 }
 41 
 42                 state->sp = PTR_ALIGN(info->next_sp, sizeof(long));
 43 
 44         } while (!get_stack_info(state->sp, state->task, info,
 45                                  &state->stack_mask));
 46 
 47         return false;
 48 }
 49 EXPORT_SYMBOL_GPL(unwind_next_frame);
 50 
 51 void __unwind_start(struct unwind_state *state, struct task_struct *task,
 52                     struct pt_regs *regs, unsigned long *first_frame)
 53 {
 54         memset(state, 0, sizeof(*state));
 55 
 56         state->task = task;
 57         state->sp   = PTR_ALIGN(first_frame, sizeof(long));
 58 
 59         get_stack_info(first_frame, state->task, &state->stack_info,
 60                        &state->stack_mask);
 61 
 62         /*
 63          * The caller can provide the address of the first frame directly
 64          * (first_frame) or indirectly (regs->sp) to indicate which stack frame
 65          * to start unwinding at.  Skip ahead until we reach it.
 66          */
 67         if (!unwind_done(state) &&
 68             (!on_stack(&state->stack_info, first_frame, sizeof(long)) ||
 69             !__kernel_text_address(*first_frame)))
 70                 unwind_next_frame(state);
 71 }
 72 EXPORT_SYMBOL_GPL(__unwind_start);
 73 

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