forked from OSchip/llvm-project
88fdce5be6
Addresses on AArch64 can have top byte tags, memory tags and pointer authentication signatures in the upper bits. While testing memory tagging I found that memory read couldn't read a range if the two addresses had different tags. The same could apply to signed pointers given the right circumstance. (lldb) memory read mte_buf_alt_tag mte_buf+16 error: end address (0x900fffff7ff8010) must be greater than the start address (0xa00fffff7ff8000). Or it would try to read a lot more memory than expected. (lldb) memory read mte_buf mte_buf_alt_tag+16 error: Normally, 'memory read' will not read over 1024 bytes of data. error: Please use --force to override this restriction just once. error: or set target.max-memory-read-size if you will often need a larger limit. Fix this by removing non address bits before we calculate the read range. A test is added for AArch64 Linux that confirms this by using the top byte ignore feature. This means that if you do read with a tagged pointer the output does not include those tags. This is potentially confusing but I think overall it's better that we don't pretend that we're reading memory from a range that the process is unable to map. (lldb) p ptr1 (char *) $4 = 0x3400fffffffff140 "\x80\xf1\xff\xff\xff\xff" (lldb) p ptr2 (char *) $5 = 0x5600fffffffff140 "\x80\xf1\xff\xff\xff\xff" (lldb) memory read ptr1 ptr2+16 0xfffffffff140: 80 f1 ff ff ff ff 00 00 38 70 bc f7 ff ff 00 00 ........8p...... Reviewed By: omjavaid, danielkiss Differential Revision: https://reviews.llvm.org/D103626 |
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| .. | ||
| CMakeLists.txt | ||
| CommandCompletions.cpp | ||
| CommandObjectApropos.cpp | ||
| CommandObjectApropos.h | ||
| CommandObjectBreakpoint.cpp | ||
| CommandObjectBreakpoint.h | ||
| CommandObjectBreakpointCommand.cpp | ||
| CommandObjectBreakpointCommand.h | ||
| CommandObjectCommands.cpp | ||
| CommandObjectCommands.h | ||
| CommandObjectDisassemble.cpp | ||
| CommandObjectDisassemble.h | ||
| CommandObjectExpression.cpp | ||
| CommandObjectExpression.h | ||
| CommandObjectFrame.cpp | ||
| CommandObjectFrame.h | ||
| CommandObjectGUI.cpp | ||
| CommandObjectGUI.h | ||
| CommandObjectHelp.cpp | ||
| CommandObjectHelp.h | ||
| CommandObjectLanguage.cpp | ||
| CommandObjectLanguage.h | ||
| CommandObjectLog.cpp | ||
| CommandObjectLog.h | ||
| CommandObjectMemory.cpp | ||
| CommandObjectMemory.h | ||
| CommandObjectMemoryTag.cpp | ||
| CommandObjectMemoryTag.h | ||
| CommandObjectMultiword.cpp | ||
| CommandObjectPlatform.cpp | ||
| CommandObjectPlatform.h | ||
| CommandObjectPlugin.cpp | ||
| CommandObjectPlugin.h | ||
| CommandObjectProcess.cpp | ||
| CommandObjectProcess.h | ||
| CommandObjectQuit.cpp | ||
| CommandObjectQuit.h | ||
| CommandObjectRegexCommand.cpp | ||
| CommandObjectRegexCommand.h | ||
| CommandObjectRegister.cpp | ||
| CommandObjectRegister.h | ||
| CommandObjectReproducer.cpp | ||
| CommandObjectReproducer.h | ||
| CommandObjectScript.cpp | ||
| CommandObjectScript.h | ||
| CommandObjectSession.cpp | ||
| CommandObjectSession.h | ||
| CommandObjectSettings.cpp | ||
| CommandObjectSettings.h | ||
| CommandObjectSource.cpp | ||
| CommandObjectSource.h | ||
| CommandObjectStats.cpp | ||
| CommandObjectStats.h | ||
| CommandObjectTarget.cpp | ||
| CommandObjectTarget.h | ||
| CommandObjectThread.cpp | ||
| CommandObjectThread.h | ||
| CommandObjectThreadUtil.cpp | ||
| CommandObjectThreadUtil.h | ||
| CommandObjectTrace.cpp | ||
| CommandObjectTrace.h | ||
| CommandObjectType.cpp | ||
| CommandObjectType.h | ||
| CommandObjectVersion.cpp | ||
| CommandObjectVersion.h | ||
| CommandObjectWatchpoint.cpp | ||
| CommandObjectWatchpoint.h | ||
| CommandObjectWatchpointCommand.cpp | ||
| CommandObjectWatchpointCommand.h | ||
| CommandOptionsProcessLaunch.cpp | ||
| CommandOptionsProcessLaunch.h | ||
| Options.td | ||
| OptionsBase.td | ||