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X86-64 kernel backtrace#4

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Commits on Dec 23, 2016

• x86_64 | paging: expose the PDE.PS bit and the leaf-ness test

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• x86: add rdrip() and rdrsp()

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• x86_64 | mem_to_local_phys: fix docstring

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• x86_64 | kernel | debug: recognize non-4k pages in debug_vaddr_identify

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• kernel | hake: drop an apparently obsolete comment

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• kernel | x86-64: provide _start_kernel_text

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Commits on Jan 12, 2017

• hake: add a config option for stack trace functionality

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• kernel | x86: provide all symbols in .dynsyms, if Config.stack_trace

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• kernel | x86: compile with frame pointer, if Config.stack_trace

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• kernel: add qsort.c, if Config.stack_trace

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• kernel | x86-64 | debug: backtrace implementation

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• kernel | x86-64 | init: enable stack tracing, if Config.stack_trace

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• kernel | x86: print backtrace on __stack_chk_fail()

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• nix: provisionally switch to gdb-multitarget

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• qemu-wrapper: use gdb-multiarch where available, fall back to plain gdb

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• kernel | x86_64 | init: relocate dynsyms later

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• x86 | debug: qemu_debug_puts()

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• x86 | debug: qemu_debug_printf ()

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• kernel | x86_64 | debug: IDT dumping facility

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• kernel | x86_64 | stackwalker: print the address delta

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• kernel | x86_64 | stackwalker: avoid misattributions due to local symbols missing from .dynsyms

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• qemu-wrapper: write QEMU debug port output to debugcon.out

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• qemu-wrapper: --display option to allow QEMU show target display

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• kernel | x86_64 | stackwalker: use more specific address types, as per code review

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• kernel | x86.h: use more specific address types for rdr{i,s}p(), as per review

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