[lldb-dev] Adding lldb support for ppc64le

[Alexandre Yukio Yamashita via lldb-dev]

Hi,

I am new to the lldb development and trying to add support for ppc64le.

Now, I am having some problems to handle the breakpoints.
In the file /lldb/source/Plugins/Process/gdb-remote/ProcessGDBRemote.cpp:1868, 
I am not able to get the PC address.

I created a new file (NativeRegisterContextLinux_ppc64le.cpp), modifying the 
file /lldb/source/Plugins/Process/Linux/NativeRegisterContextLinux_arm64.cpp to 
implement a function to read the register values.

In the function DoReadRegisterValue 
(NativeRegisterContextLinux_ppc64le.cpp:856), I am trying to map the PC value 
using the NIP register. But the NIP is coming with a zero value.
Does anyone have an idea about why this is happening?
I am sending the code of the DoReadRegisterValue function below.

Alexandre.

------------------------------------------------------------
Status NativeRegisterContextLinux_ppc64le::DoReadRegisterValue(
    uint32_t offset, const char *reg_name, uint32_t size,
    RegisterValue &value) {
    Status error;

    elf_gregset_t regs;
    int regset = NT_PRSTATUS;
    struct iovec ioVec;
    struct pt_regs regs_p;
    ioVec.iov_base = &regs;
    ioVec.iov_len = sizeof regs;

    bool isPc = strcmp(reg_name, "pc") == 0;
    if (isPc) {
    error = NativeProcessLinux::PtraceWrapper(PTRACE_GETREGSET,
            m_thread.GetID(), &regset, &regs_p, sizeof regs_p);
    } else {
    error = NativeProcessLinux::PtraceWrapper(PTRACE_GETREGSET,
            m_thread.GetID(), &regset, &ioVec, sizeof regs);
    }

    if (error.Success()) {
      ArchSpec arch;
      if (m_thread.GetProcess()->GetArchitecture(arch))
    if (isPc) {
        value.SetBytes(&regs_p.nip, 8, arch.GetByteOrder());
    } else {
        value.SetBytes((void *) (((unsigned char *) (regs)) + offset), 8,
                arch.GetByteOrder());
    }
      else
        error.SetErrorString("failed to get architecture");
    }
  return error;
}

--
Alexandre Yukio Yamashita
Eldorado Research Institute
www.eldorado.org.br<http://www.eldorado.org.br/>

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