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LibSymbolication: Unbreak symbolication with -z separate-code linking

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We were incorrectly assuming that the mapped .text segment for an ELF
image was always at the base of the image mapping. Now that we have
.rodata mappings as well, it's possible for one of them to come before
the .text.
This commit is contained in:
Andreas Kling 2021-09-04 20:29:06 +02:00
parent b7ee0191ea
commit 24ef8b118a
1 changed files with 14 additions and 2 deletions
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16
Userland/Libraries/LibSymbolication/Symbolication.cpp
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@ -169,7 +169,7 @@ Vector<Symbol> symbolicate_thread(pid_t pid, pid_t tid)
String path;
if (name == "/usr/lib/Loader.so") {
path = name;
} else if (name.ends_with(": .text")) {
} else if (name.ends_with(": .text") || name.ends_with(": .rodata")) {
auto parts = name.split_view(':');
path = parts[0];
if (!path.starts_with('/'))
@ -208,7 +208,19 @@ Vector<Symbol> symbolicate_thread(pid_t pid, pid_t tid)
continue;
}
FlatPtr adjusted_address = address - found_region->base;
// We found an address inside of a region, but the base of that region
// may not be the base of the ELF image. For example, there could be an
// .rodata mapping at a lower address than the first .text mapping from
// the same image. look for the lowest address region with the same path.
RegionWithSymbols const* base_region = nullptr;
for (auto& region : regions) {
if (region.path != found_region->path)
continue;
if (!base_region || region.base <= base_region->base)
base_region = &region;
}
FlatPtr adjusted_address = address - base_region->base;
// We're subtracting 1 from the address because this is the return address,
// i.e. it is one instruction past the call instruction.