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MIPS: Use the new "ZC" constraint for MIPS R6 

GCC versions supporting MIPS R6 use the ZC constraint to enforce a
9-bit offset for MIPS R6. We will use that for all MIPS R6 LL/SC
instructions.

Cc: Matthew Fortune <Matthew.Fortune@imgtec.com>
Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
hifive-unleashed-5.1
Markos Chandras 2014-12-19 12:04:46 +00:00
parent 94bfb75ace
commit 123e4b3bbc
1 changed files with 6 additions and 1 deletions
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7
arch/mips/include/asm/compiler.h
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@ -16,13 +16,18 @@
#define GCC_REG_ACCUM "accum"
#endif
#ifdef CONFIG_CPU_MIPSR6
/* All MIPS R6 toolchains support the ZC constrain */
#define GCC_OFF_SMALL_ASM() "ZC"
#else
#ifndef CONFIG_CPU_MICROMIPS
#define GCC_OFF_SMALL_ASM() "R"
#elif __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 9)
#define GCC_OFF_SMALL_ASM() "ZC"
#else
#error "microMIPS compilation unsupported with GCC older than 4.9"
#endif
#endif /* CONFIG_CPU_MICROMIPS */
#endif /* CONFIG_CPU_MIPSR6 */
#ifdef CONFIG_CPU_MIPSR6
#define MIPS_ISA_LEVEL "mips64r6"