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- Separate out the vdso sources into common, vdso32, and vdso64
directories.
- Build the 32- and 64-bit vdsos in their respective subdirectories;
this greatly simplifies the build flags handling.
- Unify the mangling of Makefile flags between the 32- and 64-bit
vdso code as much as possible; all common rules are put in
arch/x86/entry/vdso/common/Makefile.include. The remaining
is very simple for 32 bits; the 64-bit one is only slightly more
complicated because it contains the x32 generation rule.
- Define __DISABLE_EXPORTS when building the vdso. This need seems to
have been masked by different ordering compile flags before.
- Change CONFIG_X86_64 to BUILD_VDSO32_64 in vdso32/system_call.S,
to make it compatible with including fake_32bit_build.h.
- The -fcf-protection= option was "leaking" from the kernel build,
for reasons that was not clear to me. Furthermore, several
distributions ship with it set to a default value other than
"-fcf-protection=none". Make it match the configuration options
for *user space*.
Note that this patch may seem large, but the vast majority of it is
simply code movement.
Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Link: https://patch.msgid.link/20251216212606.1325678-4-hpa@zytor.com
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