Add an OPENSSL_ia32cap_get() function for C code.
OPENSSL_ia32cap_addr avoids any relocations within the module, at the
cost of a runtime TEXTREL, which causes problems in some cases.
(Notably, if someone links us into a binary which uses the GCC "ifunc"
attribute, the loader crashes.)
Fix C references of OPENSSL_ia32cap_addr with a function. This is
analogous to the BSS getters. A follow-up commit will fix perlasm with a
different scheme which avoids calling into a function (clobbering
registers and complicating unwind directives.)
Change-Id: I09d6cda4cec35b693e16b5387611167da8c7a6de
Reviewed-on: https://boringssl-review.googlesource.com/15525
Reviewed-by: Adam Langley <agl@google.com>
diff --git a/include/openssl/cpu.h b/include/openssl/cpu.h
index 1a4294a..81cc5ba 100644
--- a/include/openssl/cpu.h
+++ b/include/openssl/cpu.h
@@ -91,6 +91,15 @@
* Note: the CPUID bits are pre-adjusted for the OSXSAVE bit and the YMM and XMM
* bits in XCR0, so it is not necessary to check those. */
extern uint32_t OPENSSL_ia32cap_P[4];
+
+#if defined(BORINGSSL_FIPS)
+const uint32_t *OPENSSL_ia32cap_get(void);
+#else
+static inline const uint32_t *OPENSSL_ia32cap_get(void) {
+ return OPENSSL_ia32cap_P;
+}
+#endif
+
#endif
#if defined(OPENSSL_ARM) || defined(OPENSSL_AARCH64)
