diff options
| author | Zi Shen Lim <zlim.lnx@gmail.com> | 2014-08-27 05:15:23 +0100 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2014-09-08 14:39:20 +0100 |
| commit | 4a89d2c98e1efadd135015668c499ae1bbd2131f (patch) | |
| tree | f34c520033541fb90698b1b3f1bf08164d53a71b /arch/arm64/kernel | |
| parent | 9951a157fa678db0ec92e5fc4c6320c038ffb67e (diff) | |
arm64: introduce aarch64_insn_gen_bitfield()
Introduce function to generate bitfield instructions.
Signed-off-by: Zi Shen Lim <zlim.lnx@gmail.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm64/kernel')
| -rw-r--r-- | arch/arm64/kernel/insn.c | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/arch/arm64/kernel/insn.c b/arch/arm64/kernel/insn.c index ec3a90256ff..e07d026e75d 100644 --- a/arch/arm64/kernel/insn.c +++ b/arch/arm64/kernel/insn.c @@ -26,6 +26,7 @@ #include <asm/insn.h> #define AARCH64_INSN_SF_BIT BIT(31) +#define AARCH64_INSN_N_BIT BIT(22) static int aarch64_insn_encoding_class[] = { AARCH64_INSN_CLS_UNKNOWN, @@ -259,6 +260,14 @@ u32 __kprobes aarch64_insn_encode_immediate(enum aarch64_insn_imm_type type, mask = BIT(7) - 1; shift = 15; break; + case AARCH64_INSN_IMM_S: + mask = BIT(6) - 1; + shift = 10; + break; + case AARCH64_INSN_IMM_R: + mask = BIT(6) - 1; + shift = 16; + break; default: pr_err("aarch64_insn_encode_immediate: unknown immediate encoding %d\n", type); @@ -599,3 +608,50 @@ u32 aarch64_insn_gen_add_sub_imm(enum aarch64_insn_register dst, return aarch64_insn_encode_immediate(AARCH64_INSN_IMM_12, insn, imm); } + +u32 aarch64_insn_gen_bitfield(enum aarch64_insn_register dst, + enum aarch64_insn_register src, + int immr, int imms, + enum aarch64_insn_variant variant, + enum aarch64_insn_bitfield_type type) +{ + u32 insn; + u32 mask; + + switch (type) { + case AARCH64_INSN_BITFIELD_MOVE: + insn = aarch64_insn_get_bfm_value(); + break; + case AARCH64_INSN_BITFIELD_MOVE_UNSIGNED: + insn = aarch64_insn_get_ubfm_value(); + break; + case AARCH64_INSN_BITFIELD_MOVE_SIGNED: + insn = aarch64_insn_get_sbfm_value(); + break; + default: + BUG_ON(1); + } + + switch (variant) { + case AARCH64_INSN_VARIANT_32BIT: + mask = GENMASK(4, 0); + break; + case AARCH64_INSN_VARIANT_64BIT: + insn |= AARCH64_INSN_SF_BIT | AARCH64_INSN_N_BIT; + mask = GENMASK(5, 0); + break; + default: + BUG_ON(1); + } + + BUG_ON(immr & ~mask); + BUG_ON(imms & ~mask); + + insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RD, insn, dst); + + insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RN, insn, src); + + insn = aarch64_insn_encode_immediate(AARCH64_INSN_IMM_R, insn, immr); + + return aarch64_insn_encode_immediate(AARCH64_INSN_IMM_S, insn, imms); +} |