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bpf powerpc: refactor JIT compiler code

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Refactor powerpc LDX JITing code to simplify adding BPF_PROBE_MEM
support.

Signed-off-by: Hari Bathini <hbathini@linux.ibm.com>
Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20211012123056.485795-4-hbathini@linux.ibm.com
This commit is contained in:
Hari Bathini 2021-10-12 18:00:51 +05:30 committed by Michael Ellerman
parent 04c04205bc
commit efa95f031b
2 changed files with 37 additions and 27 deletions
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33
arch/powerpc/net/bpf_jit_comp32.c
View file

@ -284,6 +284,7 @@ int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, struct codegen_context *
u32 src_reg = bpf_to_ppc(ctx, insn[i].src_reg);
u32 src_reg_h = src_reg - 1;
u32 tmp_reg = bpf_to_ppc(ctx, TMP_REG);
u32 size = BPF_SIZE(code);
s16 off = insn[i].off;
s32 imm = insn[i].imm;
bool func_addr_fixed;
@ -812,23 +813,27 @@ int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, struct codegen_context *
* BPF_LDX
*/
case BPF_LDX | BPF_MEM | BPF_B: /* dst = *(u8 *)(ul) (src + off) */
EMIT(PPC_RAW_LBZ(dst_reg, src_reg, off));
if (!fp->aux->verifier_zext)
EMIT(PPC_RAW_LI(dst_reg_h, 0));
break;
case BPF_LDX | BPF_MEM | BPF_H: /* dst = *(u16 *)(ul) (src + off) */
EMIT(PPC_RAW_LHZ(dst_reg, src_reg, off));
if (!fp->aux->verifier_zext)
EMIT(PPC_RAW_LI(dst_reg_h, 0));
break;
case BPF_LDX | BPF_MEM | BPF_W: /* dst = *(u32 *)(ul) (src + off) */
EMIT(PPC_RAW_LWZ(dst_reg, src_reg, off));
if (!fp->aux->verifier_zext)
EMIT(PPC_RAW_LI(dst_reg_h, 0));
break;
case BPF_LDX | BPF_MEM | BPF_DW: /* dst = *(u64 *)(ul) (src + off) */
EMIT(PPC_RAW_LWZ(dst_reg_h, src_reg, off));
EMIT(PPC_RAW_LWZ(dst_reg, src_reg, off + 4));
switch (size) {
case BPF_B:
EMIT(PPC_RAW_LBZ(dst_reg, src_reg, off));
break;
case BPF_H:
EMIT(PPC_RAW_LHZ(dst_reg, src_reg, off));
break;
case BPF_W:
EMIT(PPC_RAW_LWZ(dst_reg, src_reg, off));
break;
case BPF_DW:
EMIT(PPC_RAW_LWZ(dst_reg_h, src_reg, off));
EMIT(PPC_RAW_LWZ(dst_reg, src_reg, off + 4));
break;
}
if (size != BPF_DW && !fp->aux->verifier_zext)
EMIT(PPC_RAW_LI(dst_reg_h, 0));
break;
/*

31
arch/powerpc/net/bpf_jit_comp64.c
View file

@ -311,6 +311,7 @@ int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, struct codegen_context *
u32 code = insn[i].code;
u32 dst_reg = b2p[insn[i].dst_reg];
u32 src_reg = b2p[insn[i].src_reg];
u32 size = BPF_SIZE(code);
s16 off = insn[i].off;
s32 imm = insn[i].imm;
bool func_addr_fixed;
@ -778,25 +779,29 @@ int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, struct codegen_context *
*/
/* dst = *(u8 *)(ul) (src + off) */
case BPF_LDX | BPF_MEM | BPF_B:
EMIT(PPC_RAW_LBZ(dst_reg, src_reg, off));
if (insn_is_zext(&insn[i + 1]))
addrs[++i] = ctx->idx * 4;
break;
/* dst = *(u16 *)(ul) (src + off) */
case BPF_LDX | BPF_MEM | BPF_H:
EMIT(PPC_RAW_LHZ(dst_reg, src_reg, off));
if (insn_is_zext(&insn[i + 1]))
addrs[++i] = ctx->idx * 4;
break;
/* dst = *(u32 *)(ul) (src + off) */
case BPF_LDX | BPF_MEM | BPF_W:
EMIT(PPC_RAW_LWZ(dst_reg, src_reg, off));
if (insn_is_zext(&insn[i + 1]))
addrs[++i] = ctx->idx * 4;
break;
/* dst = *(u64 *)(ul) (src + off) */
case BPF_LDX | BPF_MEM | BPF_DW:
PPC_BPF_LL(dst_reg, src_reg, off);
switch (size) {
case BPF_B:
EMIT(PPC_RAW_LBZ(dst_reg, src_reg, off));
break;
case BPF_H:
EMIT(PPC_RAW_LHZ(dst_reg, src_reg, off));
break;
case BPF_W:
EMIT(PPC_RAW_LWZ(dst_reg, src_reg, off));
break;
case BPF_DW:
PPC_BPF_LL(dst_reg, src_reg, off);
break;
}
if (size != BPF_DW && insn_is_zext(&insn[i + 1]))
addrs[++i] = ctx->idx * 4;
break;
/*