Clean up some ARMv4/ARMv5 cruft.
Change-Id: I29e836fea4b53901e29f96c6888869c35f6726be
diff --git a/libc/arch-arm/include/machine/cpu-features.h b/libc/arch-arm/include/machine/cpu-features.h
index 80d3fda..fc5a8fd 100644
--- a/libc/arch-arm/include/machine/cpu-features.h
+++ b/libc/arch-arm/include/machine/cpu-features.h
@@ -34,133 +34,29 @@
*
* This is done to abstract us from the various ARM Architecture
* quirks and alphabet soup.
- *
- * IMPORTANT: We have no intention to support anything below an ARMv4T !
*/
/* __ARM_ARCH__ is a number corresponding to the ARM revision
- * we're going to support
- *
- * it looks like our toolchain doesn't define __ARM_ARCH__
+ * we're going to support. Our toolchain doesn't define __ARM_ARCH__
* so try to guess it.
- *
- *
- *
*/
#ifndef __ARM_ARCH__
-
# if defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ || \
- defined __ARM_ARCH_7R__ || defined __ARM_ARCH_7M__
-
+ defined __ARM_ARCH_7R__ || defined __ARM_ARCH_7M__
# define __ARM_ARCH__ 7
-
# elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ || \
- defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6Z__ || \
- defined __ARM_ARCH_6KZ__ || defined __ARM_ARCH_6T2__
-#
+ defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6Z__ || \
+ defined __ARM_ARCH_6KZ__ || defined __ARM_ARCH_6T2__
# define __ARM_ARCH__ 6
-#
-# elif defined __ARM_ARCH_5__ || defined __ARM_ARCH_5T__ || \
- defined __ARM_ARCH_5TE__ || defined __ARM_ARCH_5TEJ__
-#
-# define __ARM_ARCH__ 5
-#
-# elif defined __ARM_ARCH_4T__
-#
-# define __ARM_ARCH__ 4
-#
-# elif defined __ARM_ARCH_4__
-# error ARMv4 is not supported, please use ARMv4T at a minimum
# else
# error Unknown or unsupported ARM architecture
# endif
#endif
-/* experimental feature used to check that our ARMv4 workarounds
- * work correctly without a real ARMv4 machine */
-#ifdef BIONIC_EXPERIMENTAL_FORCE_ARMV4
-# undef __ARM_ARCH__
-# define __ARM_ARCH__ 4
-#endif
-
-/* define __ARM_HAVE_5TE if we have the ARMv5TE instructions */
-#if __ARM_ARCH__ > 5
-# define __ARM_HAVE_5TE 1
-#elif __ARM_ARCH__ == 5
-# if defined __ARM_ARCH_5TE__ || defined __ARM_ARCH_5TEJ__
-# define __ARM_HAVE_5TE 1
-# endif
-#endif
-
-/* instructions introduced in ARMv5 */
-#if __ARM_ARCH__ >= 5
-# define __ARM_HAVE_BLX 1
-# define __ARM_HAVE_CLZ 1
-# define __ARM_HAVE_LDC2 1
-# define __ARM_HAVE_MCR2 1
-# define __ARM_HAVE_MRC2 1
-# define __ARM_HAVE_STC2 1
-#endif
-
-/* ARMv5TE introduces a few instructions */
-#if __ARM_HAVE_5TE
-# define __ARM_HAVE_PLD 1
-# define __ARM_HAVE_MCRR 1
-# define __ARM_HAVE_MRRC 1
-#endif
-
/* define __ARM_HAVE_HALFWORD_MULTIPLY when half-word multiply instructions
* this means variants of: smul, smulw, smla, smlaw, smlal
*/
-#if __ARM_HAVE_5TE
-# define __ARM_HAVE_HALFWORD_MULTIPLY 1
-#endif
-
-/* define __ARM_HAVE_PAIR_LOAD_STORE when 64-bit memory loads and stored
- * into/from a pair of 32-bit registers is supported throuhg 'ldrd' and 'strd'
- */
-#if __ARM_HAVE_5TE
-# define __ARM_HAVE_PAIR_LOAD_STORE 1
-#endif
-
-/* define __ARM_HAVE_SATURATED_ARITHMETIC is you have the saturated integer
- * arithmetic instructions: qdd, qdadd, qsub, qdsub
- */
-#if __ARM_HAVE_5TE
-# define __ARM_HAVE_SATURATED_ARITHMETIC 1
-#endif
-
-/* define __ARM_HAVE_PC_INTERWORK when a direct assignment to the
- * pc register will switch into thumb/ARM mode depending on bit 0
- * of the new instruction address. Before ARMv5, this was not the
- * case, and you have to write:
- *
- * mov r0, [<some address>]
- * bx r0
- *
- * instead of:
- *
- * ldr pc, [<some address>]
- *
- * note that this affects any instruction that explicitly changes the
- * value of the pc register, including ldm { ...,pc } or 'add pc, #offset'
- */
-#if __ARM_ARCH__ >= 5
-# define __ARM_HAVE_PC_INTERWORK
-#endif
-
-/* define __ARM_HAVE_LDREX_STREX for ARMv6 and ARMv7 architecture to be
- * used in replacement of deprecated swp instruction
- */
-#if __ARM_ARCH__ >= 6
-# define __ARM_HAVE_LDREX_STREX
-#endif
-
-/* define __ARM_HAVE_DMB for ARMv7 architecture
- */
-#if __ARM_ARCH__ >= 7
-# define __ARM_HAVE_DMB
-#endif
+#define __ARM_HAVE_HALFWORD_MULTIPLY 1
/* define __ARM_HAVE_LDREXD for ARMv7 architecture
* (also present in ARMv6K, but not implemented in ARMv7-M, neither of which
@@ -184,18 +80,4 @@
# define __ARM_HAVE_NEON
#endif
-/* Assembly-only macros */
-#ifdef __ASSEMBLY__
-
-/* define a handy PLD(address) macro since the cache preload
- * is an optional opcode
- */
-#if __ARM_HAVE_PLD
-# define PLD(reg,offset) pld [reg, offset]
-#else
-# define PLD(reg,offset) /* nothing */
-#endif
-
-#endif /* ! __ASSEMBLY__ */
-
#endif /* _ARM_MACHINE_CPU_FEATURES_H */