[PATCH RFC 05/67] MIPS: mm: uasm: Add signed 9-bit immediate related macros
From: Markos Chandras <hidden>
Date: 2014-12-18 15:12:03
Subsystem:
mips, the rest · Maintainers:
Thomas Bogendoerfer, Linus Torvalds
From: Leonid Yegoshin <redacted> MIPS R6 redefines several instructions and reduces the immediate field to 9-bits so add related macros for the microassembler. Signed-off-by: Leonid Yegoshin <redacted> Signed-off-by: Markos Chandras <redacted> --- arch/mips/mm/uasm.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-)
diff --git a/arch/mips/mm/uasm.c b/arch/mips/mm/uasm.c
index a01b0d6cedd2..1cc8ac30be47 100644
--- a/arch/mips/mm/uasm.c
+++ b/arch/mips/mm/uasm.c@@ -24,7 +24,8 @@ enum fields { JIMM = 0x080, FUNC = 0x100, SET = 0x200, - SCIMM = 0x400 + SCIMM = 0x400, + SIMM9 = 0x800, }; #define OP_MASK 0x3f
@@ -41,6 +42,8 @@ enum fields { #define FUNC_SH 0 #define SET_MASK 0x7 #define SET_SH 0 +#define SIMM9_SH 7 +#define SIMM9_MASK 0x1ff enum opcode { insn_invalid,
@@ -116,6 +119,14 @@ static inline u32 build_scimm(u32 arg) return (arg & SCIMM_MASK) << SCIMM_SH; } +static inline u32 build_scimm9(s32 arg) +{ + WARN((arg > 0x1ff || arg < -0x200), + KERN_WARNING "Micro-assembler field overflow\n"); + + return (arg & SIMM9_MASK) << SIMM9_SH; +} + static inline u32 build_func(u32 arg) { WARN(arg & ~FUNC_MASK, KERN_WARNING "Micro-assembler field overflow\n");
--
2.2.0