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Cygwin: find_fast_cwd: don't run assembler checking code on ARM64 #76

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Nov 5, 2024
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Cygwin: find_fast_cwd: don't run assembler checking code on ARM64 #76

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28 changes: 13 additions & 15 deletions winsup/cygwin/path.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -4851,29 +4851,27 @@ find_fast_cwd_pointer ()
static fcwd_access_t **
find_fast_cwd ()
{
USHORT emulated, hosted;
fcwd_access_t **f_cwd_ptr;

/* First check if we're running in WOW64 on ARM64 emulating AMD64. Skip
fetching FAST_CWD pointer as long as there's no solution for finding
it on that system. */
if (IsWow64Process2 (GetCurrentProcess (), &emulated, &hosted)
&& hosted == IMAGE_FILE_MACHINE_ARM64)
return NULL;

/* Fetch the pointer but don't set the global fast_cwd_ptr yet. First
we have to make sure we know the version of the FAST_CWD structure
used on the system. */
fcwd_access_t **f_cwd_ptr = find_fast_cwd_pointer ();
f_cwd_ptr = find_fast_cwd_pointer ();
if (!f_cwd_ptr)
{
bool warn = 1;
USHORT emulated, hosted;

/* Check if we're running in WOW64 on ARM64 emulating AMD64. Skip
warning as long as there's no solution for finding the FAST_CWD
pointer on that system. */
if (IsWow64Process2 (GetCurrentProcess (), &emulated, &hosted)
&& hosted == IMAGE_FILE_MACHINE_ARM64)
warn = 0;

if (warn)
small_printf ("Cygwin WARNING:\n"
small_printf ("Cygwin WARNING:\n"
" Couldn't compute FAST_CWD pointer. This typically occurs if you're using\n"
" an older Cygwin version on a newer Windows. Please update to the latest\n"
" available Cygwin version from https://cygwin.com/. If the problem persists,\n"
" please see https://cygwin.com/problems.html\n\n");
}

/* Eventually, after we set the version as well, set fast_cwd_ptr. */
return f_cwd_ptr;
}
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