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Message-Id: <20221013154000.3462836-1-chenhuacai@loongson.cn>
Date: Thu, 13 Oct 2022 23:40:00 +0800
From: Huacai Chen <chenhuacai@...ngson.cn>
To: Huacai Chen <chenhuacai@...nel.org>
Cc: loongarch@...ts.linux.dev, Xuefeng Li <lixuefeng@...ngson.cn>,
Tiezhu Yang <yangtiezhu@...ngson.cn>,
Guo Ren <guoren@...nel.org>, Xuerui Wang <kernel@...0n.name>,
Jiaxun Yang <jiaxun.yang@...goat.com>,
linux-kernel@...r.kernel.org, Huacai Chen <chenhuacai@...ngson.cn>
Subject: [PATCH] LoongArch: BPF: Avoid declare variables in switch-case
Not all compilers support declare variables in switch-case, so move
declarations to the beginning of a function. Otherwise we may get such
build errors:
arch/loongarch/net/bpf_jit.c: In function ‘emit_atomic’:
arch/loongarch/net/bpf_jit.c:362:3: error: a label can only be part of a statement and a declaration is not a statement
u8 r0 = regmap[BPF_REG_0];
^~
arch/loongarch/net/bpf_jit.c: In function ‘build_insn’:
arch/loongarch/net/bpf_jit.c:727:3: error: a label can only be part of a statement and a declaration is not a statement
u8 t7 = -1;
^~
arch/loongarch/net/bpf_jit.c:778:3: error: a label can only be part of a statement and a declaration is not a statement
int ret;
^~~
arch/loongarch/net/bpf_jit.c:779:3: error: expected expression before ‘u64’
u64 func_addr;
^~~
arch/loongarch/net/bpf_jit.c:780:3: warning: ISO C90 forbids mixed declarations and code [-Wdeclaration-after-statement]
bool func_addr_fixed;
^~~~
arch/loongarch/net/bpf_jit.c:784:11: error: ‘func_addr’ undeclared (first use in this function); did you mean ‘in_addr’?
&func_addr, &func_addr_fixed);
^~~~~~~~~
in_addr
arch/loongarch/net/bpf_jit.c:784:11: note: each undeclared identifier is reported only once for each function it appears in
arch/loongarch/net/bpf_jit.c:814:3: error: a label can only be part of a statement and a declaration is not a statement
u64 imm64 = (u64)(insn + 1)->imm << 32 | (u32)insn->imm;
^~~
Signed-off-by: Huacai Chen <chenhuacai@...ngson.cn>
---
arch/loongarch/net/bpf_jit.c | 31 +++++++++++++------------------
1 file changed, 13 insertions(+), 18 deletions(-)
diff --git a/arch/loongarch/net/bpf_jit.c b/arch/loongarch/net/bpf_jit.c
index 43f0a98efe38..2a9b590f47e6 100644
--- a/arch/loongarch/net/bpf_jit.c
+++ b/arch/loongarch/net/bpf_jit.c
@@ -279,6 +279,7 @@ static void emit_atomic(const struct bpf_insn *insn, struct jit_ctx *ctx)
const u8 t1 = LOONGARCH_GPR_T1;
const u8 t2 = LOONGARCH_GPR_T2;
const u8 t3 = LOONGARCH_GPR_T3;
+ const u8 r0 = regmap[BPF_REG_0];
const u8 src = regmap[insn->src_reg];
const u8 dst = regmap[insn->dst_reg];
const s16 off = insn->off;
@@ -359,8 +360,6 @@ static void emit_atomic(const struct bpf_insn *insn, struct jit_ctx *ctx)
break;
/* r0 = atomic_cmpxchg(dst + off, r0, src); */
case BPF_CMPXCHG:
- u8 r0 = regmap[BPF_REG_0];
-
move_reg(ctx, t2, r0);
if (isdw) {
emit_insn(ctx, lld, r0, t1, 0);
@@ -390,8 +389,11 @@ static bool is_signed_bpf_cond(u8 cond)
static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx, bool extra_pass)
{
- const bool is32 = BPF_CLASS(insn->code) == BPF_ALU ||
- BPF_CLASS(insn->code) == BPF_JMP32;
+ u8 t0 = -1;
+ u64 func_addr;
+ bool func_addr_fixed;
+ int i = insn - ctx->prog->insnsi;
+ int ret, jmp_offset;
const u8 code = insn->code;
const u8 cond = BPF_OP(code);
const u8 t1 = LOONGARCH_GPR_T1;
@@ -400,8 +402,8 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx, bool ext
const u8 dst = regmap[insn->dst_reg];
const s16 off = insn->off;
const s32 imm = insn->imm;
- int jmp_offset;
- int i = insn - ctx->prog->insnsi;
+ const u64 imm64 = (u64)(insn + 1)->imm << 32 | (u32)insn->imm;
+ const bool is32 = BPF_CLASS(insn->code) == BPF_ALU || BPF_CLASS(insn->code) == BPF_JMP32;
switch (code) {
/* dst = src */
@@ -724,24 +726,23 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx, bool ext
case BPF_JMP32 | BPF_JSGE | BPF_K:
case BPF_JMP32 | BPF_JSLT | BPF_K:
case BPF_JMP32 | BPF_JSLE | BPF_K:
- u8 t7 = -1;
jmp_offset = bpf2la_offset(i, off, ctx);
if (imm) {
move_imm(ctx, t1, imm, false);
- t7 = t1;
+ t0 = t1;
} else {
/* If imm is 0, simply use zero register. */
- t7 = LOONGARCH_GPR_ZERO;
+ t0 = LOONGARCH_GPR_ZERO;
}
move_reg(ctx, t2, dst);
if (is_signed_bpf_cond(BPF_OP(code))) {
- emit_sext_32(ctx, t7, is32);
+ emit_sext_32(ctx, t0, is32);
emit_sext_32(ctx, t2, is32);
} else {
- emit_zext_32(ctx, t7, is32);
+ emit_zext_32(ctx, t0, is32);
emit_zext_32(ctx, t2, is32);
}
- if (emit_cond_jmp(ctx, cond, t2, t7, jmp_offset) < 0)
+ if (emit_cond_jmp(ctx, cond, t2, t0, jmp_offset) < 0)
goto toofar;
break;
@@ -775,10 +776,6 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx, bool ext
/* function call */
case BPF_JMP | BPF_CALL:
- int ret;
- u64 func_addr;
- bool func_addr_fixed;
-
mark_call(ctx);
ret = bpf_jit_get_func_addr(ctx->prog, insn, extra_pass,
&func_addr, &func_addr_fixed);
@@ -811,8 +808,6 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx, bool ext
/* dst = imm64 */
case BPF_LD | BPF_IMM | BPF_DW:
- u64 imm64 = (u64)(insn + 1)->imm << 32 | (u32)insn->imm;
-
move_imm(ctx, dst, imm64, is32);
return 1;
--
2.31.1
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