73 // cell in stack to be a saved frame pointer. GetCanonicFrame returns the
74 // pointer to saved frame pointer in any case.
83   // The next frame pointer does not look right. This could be a GCC frame, step  in GetCanonicFrame()
87   // Nope, this does not look right either. This means the frame after next does  in GetCanonicFrame()
88   // not have a valid frame pointer, but we can still extract the caller PC.  in GetCanonicFrame()
89   // Unfortunately, there is no way to decide between GCC and LLVM frame  in GetCanonicFrame()
105   uhwptr *frame = GetCanonicFrame(bp, stack_top, stack_bottom);  in UnwindFast()  local
106   // Lowest possible address that makes sense as the next frame pointer.  in UnwindFast()
109   // Avoid infinite loop when frame == frame[0] by using frame > prev_frame.  in UnwindFast()
110   while (IsValidFrame((uptr)frame, stack_top, bottom) &&  in UnwindFast()
111          IsAligned((uptr)frame, sizeof(*frame)) &&  in UnwindFast()
115     // 16 of the *caller's* stack frame.  Thus we must dereference the  in UnwindFast()
116     // back chain to find the caller frame before extracting it.  in UnwindFast()
117     uhwptr *caller_frame = (uhwptr*)frame[0];  in UnwindFast()
123     uhwptr pc1 = frame[14];  in UnwindFast()
125     // frame[-1] contains the return address  in UnwindFast()
126     uhwptr pc1 = frame[-1];  in UnwindFast()
128     uhwptr pc1 = STRIP_PAC_PC((void *)frame[1]);  in UnwindFast()
138     bottom = (uptr)frame;  in UnwindFast()
140     // frame[-2] contain fp of the previous frame  in UnwindFast()
141     uptr new_bp = (uptr)frame[-2];  in UnwindFast()
143     uptr new_bp = (uptr)frame[0];  in UnwindFast()
145     frame = GetCanonicFrame(new_bp, stack_top, bottom);  in UnwindFast()