[Lldb-commits] [PATCH] D98529: [lldb] Strip pointer authentication codes from aarch64 pc.

[Jason Molenda via Phabricator via lldb-commits]

jasonmolenda added a comment.

In D98529#2631860 <https://reviews.llvm.org/D98529#2631860>, @justincohen wrote:

> In the meantime, I'll look into adding something to the Crashpad minidump format to store an `addrable bits` mask, although I'm not clear how to grab this in userspace.  Should `sysctl machdep.virtual_address_size` work on iOS?  Can I grab TCR_ELx.T0SZ directly?

fwiw debugserver's code to provide the `addressing_bits:` in qHostInfo is upstreamed to the llvm.org sources, and it works on iOS as well,

  static bool GetAddressingBits(uint32_t &addressing_bits) {
    static uint32_t g_addressing_bits = 0;
    static bool g_tried_addressing_bits_syscall = false;
    if (g_tried_addressing_bits_syscall == false) {
      size_t len = sizeof (uint32_t);
      if (::sysctlbyname("machdep.virtual_address_size",
            &g_addressing_bits, &len, NULL, 0) != 0) {
        g_addressing_bits = 0;
      }
    }


Repository:
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  https://reviews.llvm.org/D98529/new/

https://reviews.llvm.org/D98529