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powerpc/bpf/jit: Introduce rotate immediate instructions

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Since we will be using the rotate immediate instructions for extended
BPF JIT, let's introduce macros for the same. And since the shift
immediate operations use the rotate immediate instructions, let's redo
those macros to use the newly introduced instructions.

Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Naveen N. Rao
2016-06-22 21:55:04 +05:30
committed by Michael Ellerman
parent b1a057879a
commit 277285b854
2 changed files with 13 additions and 9 deletions
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20
arch/powerpc/net/bpf_jit.h
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@@ -210,18 +210,20 @@ DECLARE_LOAD_FUNC(sk_load_byte_msh);
___PPC_RS(a) | ___PPC_RB(s))
#define PPC_SRW(d, a, s) EMIT(PPC_INST_SRW | ___PPC_RA(d) | \
___PPC_RS(a) | ___PPC_RB(s))
#define PPC_RLWINM(d, a, i, mb, me) EMIT(PPC_INST_RLWINM | ___PPC_RA(d) | \
___PPC_RS(a) | __PPC_SH(i) | \
__PPC_MB(mb) | __PPC_ME(me))
#define PPC_RLDICR(d, a, i, me) EMIT(PPC_INST_RLDICR | ___PPC_RA(d) | \
___PPC_RS(a) | __PPC_SH(i) | \
__PPC_ME64(me) | (((i) & 0x20) >> 4))
/* slwi = rlwinm Rx, Ry, n, 0, 31-n */
#define PPC_SLWI(d, a, i) EMIT(PPC_INST_RLWINM | ___PPC_RA(d) | \
___PPC_RS(a) | __PPC_SH(i) | \
__PPC_MB(0) | __PPC_ME(31-(i)))
#define PPC_SLWI(d, a, i) PPC_RLWINM(d, a, i, 0, 31-(i))
/* srwi = rlwinm Rx, Ry, 32-n, n, 31 */
#define PPC_SRWI(d, a, i) EMIT(PPC_INST_RLWINM | ___PPC_RA(d) | \
___PPC_RS(a) | __PPC_SH(32-(i)) | \
__PPC_MB(i) | __PPC_ME(31))
#define PPC_SRWI(d, a, i) PPC_RLWINM(d, a, 32-(i), i, 31)
/* sldi = rldicr Rx, Ry, n, 63-n */
#define PPC_SLDI(d, a, i) EMIT(PPC_INST_RLDICR | ___PPC_RA(d) | \
___PPC_RS(a) | __PPC_SH(i) | \
__PPC_MB(63-(i)) | (((i) & 0x20) >> 4))
#define PPC_SLDI(d, a, i) PPC_RLDICR(d, a, i, 63-(i))
#define PPC_NEG(d, a) EMIT(PPC_INST_NEG | ___PPC_RT(d) | ___PPC_RA(a))
/* Long jump; (unconditional 'branch') */