https://bugs.llvm.org/show_bug.cgi?id=37485
Bug ID: 37485
Summary: LLDB reads wrong registers on 64bit Windows
Product: lldb
Version: 6.0
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: All Bugs
Assignee: lldb-dev@lists.llvm.org
Reporter: kenji.koyan...@gmail.com
CC: llvm-b...@lists.llvm.org
LLDB reads wrong registers on 64bit Windows because
RegisterContextWindows_x64::GetRegisterInfoAtIndex returns wrong reference.
I encountered broken backtrace when the program stopped at function which does
not have prologue code, such as compiled with '-fomit-frame-pointer'.
In this situation, CFA is equal to rsp but LLDB reads r9.
I investigated the cause.
RegisterContextWindows_x64::GetRegisterInfoAtIndex depends the order of
lldb_XXX_x86_64 values, but RegisterIndex/g_register_infos/g_gpr_reg_indices
does not follow order.
In source/Plugins/Process/Utility/lldb-x86-register-enums.h
The order of GPRs is rax, rbx, rcx, rdx, rdi, rsi, rbp, rsp, r8, ...
In source/Plugins/Process/Windows/Common/x64/RegisterContextWindows_x64.cpp
The order of GPRs is rax, rbx, rcx, rdx, rdi, rsi, r8, r9, r10, ...
I am using is what I built by myself on MinGW.
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