101 lines
2.1 KiB
Plaintext
101 lines
2.1 KiB
Plaintext
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#!/usr/bin/tclsh
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################################################################################
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#
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# Given a path to a mach-o binary and input that includes stack backtraces in
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# the format printed by iBoot's arch_backtrace_task, annotate the backtraces
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# with symbol names
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#
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# Lines in the backtrace have the form
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#
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# <whitespace><token><whitespace><hex number><hex number><newline>
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# or
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# <whitespace><hex number><hex number><newline>
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#
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proc main { } {
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global argv
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set binfile [lindex $argv 0]
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if {![file readable $binfile]} {
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puts "can't read '$binfile'"
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exit 1
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}
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# run nm and parse the output
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do_nm $binfile
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# read input lines
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while {[gets stdin line] != -1} {
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puts -nonewline $line
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if {([scan $line " %s %x %x%n" pad pc lr len] == 4) || ([scan $line " %x %x%n" pc lr len] == 3)} {
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if {$len == [string length $line]} {
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set detail [find_sym $pc]
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if {$detail != ""} {
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puts -nonewline " ($detail)"
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}
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}
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}
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puts ""
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}
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}
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proc do_nm {binfile} {
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global symbols
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global symbol_index
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# puts "reading symbols from $binfile"
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set lines [exec nm -n $binfile]
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foreach {_addr type _sym} $lines {
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set sym [string range $_sym 1 end]
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set addr "0x$_addr"
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set symbols($addr) $sym
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}
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set symbol_index [lsort -integer [array names symbols]]
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# puts "[llength [array names symbols]] symbols"
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}
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proc find_sym {pc} {
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global symbols
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global symbol_index
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# puts "looking for $pc"
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set candidate [lindex $symbol_index 0]
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# if the pc is before the first symbol, it's not in the object file
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if {$pc < $candidate} {
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# puts "too low (less than $candidate)"
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return ""
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}
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foreach addr [lrange $symbol_index 1 end] {
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# puts "trying $addr"
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# if the next symbol is above the pc, the candidate is where we are
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if {$pc < $addr} {
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break
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}
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# advance the candidate
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set candidate $addr
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}
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# the last symbol is a sentinel, if the PC is above it, it's not in the object file
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if {$pc > $addr} {
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# puts "too high"
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return ""
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}
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set key [format 0x%08x $candidate]
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set offset [format 0x%x [expr $addr - $key]]
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return "$symbols($key)+$offset"
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}
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main
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