<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/54664>54664</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [PowerPC] crash in libunwind/src/AddressSpace.hpp:164 on powerpc after running cargo (from rust)
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            new issue
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          pkubaj
      </td>
    </tr>
</table>

<pre>
    On FreeBSD 13.1-RC1/powerpc (32-bits):
```
cargo new hello_cargo
cd hello_cargo
env RUST_BACKTRACE=1 cargo build
<segfault>
```

Backtrace:
```
Program terminated with signal SIGSEGV, Segmentation fault.
Address not mapped to object.
#0  libunwind::LocalAddressSpace::get32 (addr=431585656, this=<optimized out>) at /usr/src/contrib/llvm-project/libunwind/src/AddressSpace.hpp:164
164         memcpy(&val, (void *)addr, sizeof(val));
(gdb) bt
#0  libunwind::LocalAddressSpace::get32 (addr=431585656, this=<optimized out>) at /usr/src/contrib/llvm-project/libunwind/src/AddressSpace.hpp:164
#1  libunwind::CFI_Parser<libunwind::LocalAddressSpace>::parseCIE (addressSpace=..., cie=431585656, cieInfo=0xffff82e8)
    at /usr/src/contrib/llvm-project/libunwind/src/DwarfParser.hpp:319
#2  0x421bf76c in libunwind::CFI_Parser<libunwind::LocalAddressSpace>::findFDE (addressSpace=..., pc=18016363, ehSectionStart=28326632,
    sectionLength=<optimized out>, fdeHint=<optimized out>, fdeInfo=0xffff8308, cieInfo=0xffff82e8)
    at /usr/src/contrib/llvm-project/libunwind/src/DwarfParser.hpp:252
#3  0x421bf458 in libunwind::UnwindCursor<libunwind::LocalAddressSpace, libunwind::Registers_ppc>::getInfoFromDwarfSection (this=0xffff9848,
    pc=18016363, sects=..., fdeSectionOffsetHint=0) at /usr/src/contrib/llvm-project/libunwind/src/UnwindCursor.hpp:1566
#4  0x421bb658 in libunwind::UnwindCursor<libunwind::LocalAddressSpace, libunwind::Registers_ppc>::setInfoBasedOnIPRegister (this=0xffff9848,
    isReturnAddress=<optimized out>) at /usr/src/contrib/llvm-project/libunwind/src/UnwindCursor.hpp:1960
#5  0x421bb418 in libunwind::UnwindCursor<libunwind::LocalAddressSpace, libunwind::Registers_ppc>::step (this=0xffff9848)
    at /usr/src/contrib/llvm-project/libunwind/src/UnwindCursor.hpp:2105
#6  0x421ba108 in __unw_step (cursor=0xffff9848) at /usr/src/contrib/llvm-project/libunwind/src/libunwind.cpp:176
#7  0x421b8134 in _Unwind_Backtrace (callback=0x1977e74, ref=0xffff9c88) at /usr/src/contrib/llvm-project/libunwind/src/UnwindLevel1-gcc-ext.c:131
```

That points to https://github.com/llvm/llvm-project/blob/main/libunwind/src/AddressSpace.hpp#L164.
A simplified program that always segfaults during memcpy:
```
#include <sys/types.h>
#include <string.h>
#include <stdio.h>

typedef uintptr_t pint_t;

uint32_t get32(pint_t addr) {
        uint32_t val;
        memcpy(&val, (void *)addr, sizeof(val));
        return val;
}

int main(int argc, char **argv)
{
        uint32_t a = get32(431585656);
        printf("%d\n", a);
        return 0;
}
```
</pre>
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