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GP-2241: Fix issue with GDB and non-64-bit targets without info proc mappings

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This commit is contained in:
Dan
2022-08-22 15:07:40 -04:00
parent db3ced7f96
commit 75691a0f0e
7 changed files with 106 additions and 42 deletions
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Ghidra/Debug/Debugger-agent-gdb/src/main/java/agent/gdb/model/impl/GdbModelTargetProcessMemory.java
+48 -31
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@@ -62,41 +62,58 @@ public class GdbModelTargetProcessMemory
this.inferior = inferior.inferior;
}
protected CompletableFuture<Map<BigInteger, GdbMemoryMapping>> defaultUsingAddressSize() {
return inferior.evaluate("sizeof(int*)").thenApply(sizeStr -> {
int size;
try {
size = Integer.parseInt(sizeStr);
}
catch (NumberFormatException e) {
throw new GdbCommandError("Couldn't determine address size: " + e);
}
BigInteger start = BigInteger.ZERO;
BigInteger end = BigInteger.ONE.shiftLeft(size * 8);
if (size >= 0 && size < 8) {
GdbMemoryMapping mapping = new GdbMemoryMapping(start, end,
end.subtract(start), BigInteger.ZERO, "rwx", "default");
return Map.of(start, mapping);
}
if (size == 8) {
// TODO: This split shouldn't be necessary.
BigInteger split = BigInteger.valueOf(Long.MAX_VALUE);
GdbMemoryMapping lowMapping = new GdbMemoryMapping(start, split,
split.subtract(start), BigInteger.ZERO, "rwx", "defaultLow");
GdbMemoryMapping highMapping = new GdbMemoryMapping(split, end,
end.subtract(split), BigInteger.ZERO, "rwx", "defaultHigh");
return Map.of(start, lowMapping, split, highMapping);
}
throw new GdbCommandError("Unexpected address size: " + size);
});
}
protected void updateUsingMappings(Map<BigInteger, GdbMemoryMapping> byStart) {
List<GdbModelTargetMemoryRegion> regions;
synchronized (this) {
regions =
byStart.values().stream().map(this::getTargetRegion).collect(Collectors.toList());
if (regions.isEmpty() && valid) {
Map<BigInteger, GdbMemoryMapping> defaultMap =
new HashMap<BigInteger, GdbMemoryMapping>();
AddressSet addressSet = impl.getAddressFactory().getAddressSet();
BigInteger start = addressSet.getMinAddress().getOffsetAsBigInteger();
BigInteger end = addressSet.getMaxAddress().getOffsetAsBigInteger();
if (end.longValue() < 0) {
BigInteger split = BigInteger.valueOf(Long.MAX_VALUE);
GdbMemoryMapping lmem = new GdbMemoryMapping(start, split,
split.subtract(start), start.subtract(start), "rwx", "defaultLow");
defaultMap.put(start, lmem);
split = split.add(BigInteger.valueOf(1));
GdbMemoryMapping hmem = new GdbMemoryMapping(split, end,
end.subtract(split), split.subtract(split), "rwx", "defaultHigh");
defaultMap.put(split, hmem);
}
else {
GdbMemoryMapping mem = new GdbMemoryMapping(start, end,
end.subtract(start), start.subtract(start), "rwx", "default");
defaultMap.put(start, mem);
}
regions =
defaultMap.values()
.stream()
.map(this::getTargetRegion)
.collect(Collectors.toList());
if (!valid) {
setElements(List.of(), "Refreshed");
}
}
setElements(regions, "Refreshed");
CompletableFuture<Map<BigInteger, GdbMemoryMapping>> maybeDefault =
byStart.isEmpty() ? defaultUsingAddressSize()
: CompletableFuture.completedFuture(byStart);
maybeDefault.thenAccept(mappings -> {
List<GdbModelTargetMemoryRegion> regions;
synchronized (this) {
regions = mappings.values()
.stream()
.map(this::getTargetRegion)
.collect(Collectors.toList());
}
setElements(regions, "Refreshed");
}).exceptionally(ex -> {
Msg.info(this, "Failed to update regions: " + ex);
return null;
});
}
@Override