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-rw-r--r--arch/powerpc/net/bpf_jit.h284
1 files changed, 97 insertions, 187 deletions
diff --git a/arch/powerpc/net/bpf_jit.h b/arch/powerpc/net/bpf_jit.h
index 55d4377ccfae..cdea5dccaefe 100644
--- a/arch/powerpc/net/bpf_jit.h
+++ b/arch/powerpc/net/bpf_jit.h
@@ -11,225 +11,78 @@
#ifndef __ASSEMBLY__
#include <asm/types.h>
+#include <asm/ppc-opcode.h>
-#ifdef PPC64_ELF_ABI_v1
+#ifdef CONFIG_PPC64_ELF_ABI_V1
#define FUNCTION_DESCR_SIZE 24
#else
#define FUNCTION_DESCR_SIZE 0
#endif
-/*
- * 16-bit immediate helper macros: HA() is for use with sign-extending instrs
- * (e.g. LD, ADDI). If the bottom 16 bits is "-ve", add another bit into the
- * top half to negate the effect (i.e. 0xffff + 1 = 0x(1)0000).
- */
-#define IMM_H(i) ((uintptr_t)(i)>>16)
-#define IMM_HA(i) (((uintptr_t)(i)>>16) + \
- (((uintptr_t)(i) & 0x8000) >> 15))
-#define IMM_L(i) ((uintptr_t)(i) & 0xffff)
+#define CTX_NIA(ctx) ((unsigned long)ctx->idx * 4)
#define PLANT_INSTR(d, idx, instr) \
do { if (d) { (d)[idx] = instr; } idx++; } while (0)
#define EMIT(instr) PLANT_INSTR(image, ctx->idx, instr)
-#define PPC_NOP() EMIT(PPC_INST_NOP)
-#define PPC_BLR() EMIT(PPC_INST_BLR)
-#define PPC_BLRL() EMIT(PPC_INST_BLRL)
-#define PPC_MTLR(r) EMIT(PPC_INST_MTLR | ___PPC_RT(r))
-#define PPC_BCTR() EMIT(PPC_INST_BCTR)
-#define PPC_MTCTR(r) EMIT(PPC_INST_MTCTR | ___PPC_RT(r))
-#define PPC_ADDI(d, a, i) EMIT(PPC_INST_ADDI | ___PPC_RT(d) | \
- ___PPC_RA(a) | IMM_L(i))
-#define PPC_MR(d, a) PPC_OR(d, a, a)
-#define PPC_LI(r, i) PPC_ADDI(r, 0, i)
-#define PPC_ADDIS(d, a, i) EMIT(PPC_INST_ADDIS | \
- ___PPC_RT(d) | ___PPC_RA(a) | IMM_L(i))
-#define PPC_LIS(r, i) PPC_ADDIS(r, 0, i)
-#define PPC_STD(r, base, i) EMIT(PPC_INST_STD | ___PPC_RS(r) | \
- ___PPC_RA(base) | ((i) & 0xfffc))
-#define PPC_STDX(r, base, b) EMIT(PPC_INST_STDX | ___PPC_RS(r) | \
- ___PPC_RA(base) | ___PPC_RB(b))
-#define PPC_STDU(r, base, i) EMIT(PPC_INST_STDU | ___PPC_RS(r) | \
- ___PPC_RA(base) | ((i) & 0xfffc))
-#define PPC_STW(r, base, i) EMIT(PPC_INST_STW | ___PPC_RS(r) | \
- ___PPC_RA(base) | IMM_L(i))
-#define PPC_STWU(r, base, i) EMIT(PPC_INST_STWU | ___PPC_RS(r) | \
- ___PPC_RA(base) | IMM_L(i))
-#define PPC_STH(r, base, i) EMIT(PPC_INST_STH | ___PPC_RS(r) | \
- ___PPC_RA(base) | IMM_L(i))
-#define PPC_STB(r, base, i) EMIT(PPC_INST_STB | ___PPC_RS(r) | \
- ___PPC_RA(base) | IMM_L(i))
-
-#define PPC_LBZ(r, base, i) EMIT(PPC_INST_LBZ | ___PPC_RT(r) | \
- ___PPC_RA(base) | IMM_L(i))
-#define PPC_LD(r, base, i) EMIT(PPC_INST_LD | ___PPC_RT(r) | \
- ___PPC_RA(base) | ((i) & 0xfffc))
-#define PPC_LDX(r, base, b) EMIT(PPC_INST_LDX | ___PPC_RT(r) | \
- ___PPC_RA(base) | ___PPC_RB(b))
-#define PPC_LWZ(r, base, i) EMIT(PPC_INST_LWZ | ___PPC_RT(r) | \
- ___PPC_RA(base) | IMM_L(i))
-#define PPC_LHZ(r, base, i) EMIT(PPC_INST_LHZ | ___PPC_RT(r) | \
- ___PPC_RA(base) | IMM_L(i))
-#define PPC_LHBRX(r, base, b) EMIT(PPC_INST_LHBRX | ___PPC_RT(r) | \
- ___PPC_RA(base) | ___PPC_RB(b))
-#define PPC_LDBRX(r, base, b) EMIT(PPC_INST_LDBRX | ___PPC_RT(r) | \
- ___PPC_RA(base) | ___PPC_RB(b))
-
-#define PPC_BPF_LDARX(t, a, b, eh) EMIT(PPC_INST_LDARX | ___PPC_RT(t) | \
- ___PPC_RA(a) | ___PPC_RB(b) | \
- __PPC_EH(eh))
-#define PPC_BPF_LWARX(t, a, b, eh) EMIT(PPC_INST_LWARX | ___PPC_RT(t) | \
- ___PPC_RA(a) | ___PPC_RB(b) | \
- __PPC_EH(eh))
-#define PPC_BPF_STWCX(s, a, b) EMIT(PPC_INST_STWCX | ___PPC_RS(s) | \
- ___PPC_RA(a) | ___PPC_RB(b))
-#define PPC_BPF_STDCX(s, a, b) EMIT(PPC_INST_STDCX | ___PPC_RS(s) | \
- ___PPC_RA(a) | ___PPC_RB(b))
-#define PPC_CMPWI(a, i) EMIT(PPC_INST_CMPWI | ___PPC_RA(a) | IMM_L(i))
-#define PPC_CMPDI(a, i) EMIT(PPC_INST_CMPDI | ___PPC_RA(a) | IMM_L(i))
-#define PPC_CMPW(a, b) EMIT(PPC_INST_CMPW | ___PPC_RA(a) | \
- ___PPC_RB(b))
-#define PPC_CMPD(a, b) EMIT(PPC_INST_CMPD | ___PPC_RA(a) | \
- ___PPC_RB(b))
-#define PPC_CMPLWI(a, i) EMIT(PPC_INST_CMPLWI | ___PPC_RA(a) | IMM_L(i))
-#define PPC_CMPLDI(a, i) EMIT(PPC_INST_CMPLDI | ___PPC_RA(a) | IMM_L(i))
-#define PPC_CMPLW(a, b) EMIT(PPC_INST_CMPLW | ___PPC_RA(a) | \
- ___PPC_RB(b))
-#define PPC_CMPLD(a, b) EMIT(PPC_INST_CMPLD | ___PPC_RA(a) | \
- ___PPC_RB(b))
-
-#define PPC_SUB(d, a, b) EMIT(PPC_INST_SUB | ___PPC_RT(d) | \
- ___PPC_RB(a) | ___PPC_RA(b))
-#define PPC_ADD(d, a, b) EMIT(PPC_INST_ADD | ___PPC_RT(d) | \
- ___PPC_RA(a) | ___PPC_RB(b))
-#define PPC_MULD(d, a, b) EMIT(PPC_INST_MULLD | ___PPC_RT(d) | \
- ___PPC_RA(a) | ___PPC_RB(b))
-#define PPC_MULW(d, a, b) EMIT(PPC_INST_MULLW | ___PPC_RT(d) | \
- ___PPC_RA(a) | ___PPC_RB(b))
-#define PPC_MULHWU(d, a, b) EMIT(PPC_INST_MULHWU | ___PPC_RT(d) | \
- ___PPC_RA(a) | ___PPC_RB(b))
-#define PPC_MULI(d, a, i) EMIT(PPC_INST_MULLI | ___PPC_RT(d) | \
- ___PPC_RA(a) | IMM_L(i))
-#define PPC_DIVWU(d, a, b) EMIT(PPC_INST_DIVWU | ___PPC_RT(d) | \
- ___PPC_RA(a) | ___PPC_RB(b))
-#define PPC_DIVDU(d, a, b) EMIT(PPC_INST_DIVDU | ___PPC_RT(d) | \
- ___PPC_RA(a) | ___PPC_RB(b))
-#define PPC_AND(d, a, b) EMIT(PPC_INST_AND | ___PPC_RA(d) | \
- ___PPC_RS(a) | ___PPC_RB(b))
-#define PPC_ANDI(d, a, i) EMIT(PPC_INST_ANDI | ___PPC_RA(d) | \
- ___PPC_RS(a) | IMM_L(i))
-#define PPC_AND_DOT(d, a, b) EMIT(PPC_INST_ANDDOT | ___PPC_RA(d) | \
- ___PPC_RS(a) | ___PPC_RB(b))
-#define PPC_OR(d, a, b) EMIT(PPC_INST_OR | ___PPC_RA(d) | \
- ___PPC_RS(a) | ___PPC_RB(b))
-#define PPC_MR(d, a) PPC_OR(d, a, a)
-#define PPC_ORI(d, a, i) EMIT(PPC_INST_ORI | ___PPC_RA(d) | \
- ___PPC_RS(a) | IMM_L(i))
-#define PPC_ORIS(d, a, i) EMIT(PPC_INST_ORIS | ___PPC_RA(d) | \
- ___PPC_RS(a) | IMM_L(i))
-#define PPC_XOR(d, a, b) EMIT(PPC_INST_XOR | ___PPC_RA(d) | \
- ___PPC_RS(a) | ___PPC_RB(b))
-#define PPC_XORI(d, a, i) EMIT(PPC_INST_XORI | ___PPC_RA(d) | \
- ___PPC_RS(a) | IMM_L(i))
-#define PPC_XORIS(d, a, i) EMIT(PPC_INST_XORIS | ___PPC_RA(d) | \
- ___PPC_RS(a) | IMM_L(i))
-#define PPC_EXTSW(d, a) EMIT(PPC_INST_EXTSW | ___PPC_RA(d) | \
- ___PPC_RS(a))
-#define PPC_SLW(d, a, s) EMIT(PPC_INST_SLW | ___PPC_RA(d) | \
- ___PPC_RS(a) | ___PPC_RB(s))
-#define PPC_SLD(d, a, s) EMIT(PPC_INST_SLD | ___PPC_RA(d) | \
- ___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_SRAW(d, a, s) EMIT(PPC_INST_SRAW | ___PPC_RA(d) | \
- ___PPC_RS(a) | ___PPC_RB(s))
-#define PPC_SRAWI(d, a, i) EMIT(PPC_INST_SRAWI | ___PPC_RA(d) | \
- ___PPC_RS(a) | __PPC_SH(i))
-#define PPC_SRD(d, a, s) EMIT(PPC_INST_SRD | ___PPC_RA(d) | \
- ___PPC_RS(a) | ___PPC_RB(s))
-#define PPC_SRAD(d, a, s) EMIT(PPC_INST_SRAD | ___PPC_RA(d) | \
- ___PPC_RS(a) | ___PPC_RB(s))
-#define PPC_SRADI(d, a, i) EMIT(PPC_INST_SRADI | ___PPC_RA(d) | \
- ___PPC_RS(a) | __PPC_SH64(i))
-#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_RLWINM_DOT(d, a, i, mb, me) EMIT(PPC_INST_RLWINM_DOT | \
- ___PPC_RA(d) | ___PPC_RS(a) | \
- __PPC_SH(i) | __PPC_MB(mb) | \
- __PPC_ME(me))
-#define PPC_RLWIMI(d, a, i, mb, me) EMIT(PPC_INST_RLWIMI | ___PPC_RA(d) | \
- ___PPC_RS(a) | __PPC_SH(i) | \
- __PPC_MB(mb) | __PPC_ME(me))
-#define PPC_RLDICL(d, a, i, mb) EMIT(PPC_INST_RLDICL | ___PPC_RA(d) | \
- ___PPC_RS(a) | __PPC_SH64(i) | \
- __PPC_MB64(mb))
-#define PPC_RLDICR(d, a, i, me) EMIT(PPC_INST_RLDICR | ___PPC_RA(d) | \
- ___PPC_RS(a) | __PPC_SH64(i) | \
- __PPC_ME64(me))
-
-/* slwi = rlwinm Rx, Ry, n, 0, 31-n */
-#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) PPC_RLWINM(d, a, 32-(i), i, 31)
-/* sldi = rldicr Rx, Ry, n, 63-n */
-#define PPC_SLDI(d, a, i) PPC_RLDICR(d, a, i, 63-(i))
-/* sldi = rldicl Rx, Ry, 64-n, n */
-#define PPC_SRDI(d, a, i) PPC_RLDICL(d, a, 64-(i), i)
-
-#define PPC_NEG(d, a) EMIT(PPC_INST_NEG | ___PPC_RT(d) | ___PPC_RA(a))
-
/* Long jump; (unconditional 'branch') */
-#define PPC_JMP(dest) EMIT(PPC_INST_BRANCH | \
- (((dest) - (ctx->idx * 4)) & 0x03fffffc))
+#define PPC_JMP(dest) \
+ do { \
+ long offset = (long)(dest) - CTX_NIA(ctx); \
+ if ((dest) != 0 && !is_offset_in_branch_range(offset)) { \
+ pr_err_ratelimited("Branch offset 0x%lx (@%u) out of range\n", offset, ctx->idx); \
+ return -ERANGE; \
+ } \
+ EMIT(PPC_RAW_BRANCH(offset)); \
+ } while (0)
+
/* "cond" here covers BO:BI fields. */
-#define PPC_BCC_SHORT(cond, dest) EMIT(PPC_INST_BRANCH_COND | \
- (((cond) & 0x3ff) << 16) | \
- (((dest) - (ctx->idx * 4)) & \
- 0xfffc))
+#define PPC_BCC_SHORT(cond, dest) \
+ do { \
+ long offset = (long)(dest) - CTX_NIA(ctx); \
+ if ((dest) != 0 && !is_offset_in_cond_branch_range(offset)) { \
+ pr_err_ratelimited("Conditional branch offset 0x%lx (@%u) out of range\n", offset, ctx->idx); \
+ return -ERANGE; \
+ } \
+ EMIT(PPC_INST_BRANCH_COND | (((cond) & 0x3ff) << 16) | (offset & 0xfffc)); \
+ } while (0)
+
/* Sign-extended 32-bit immediate load */
#define PPC_LI32(d, i) do { \
if ((int)(uintptr_t)(i) >= -32768 && \
(int)(uintptr_t)(i) < 32768) \
- PPC_LI(d, i); \
+ EMIT(PPC_RAW_LI(d, i)); \
else { \
- PPC_LIS(d, IMM_H(i)); \
+ EMIT(PPC_RAW_LIS(d, IMM_H(i))); \
if (IMM_L(i)) \
- PPC_ORI(d, d, IMM_L(i)); \
+ EMIT(PPC_RAW_ORI(d, d, IMM_L(i))); \
} } while(0)
+#ifdef CONFIG_PPC64
#define PPC_LI64(d, i) do { \
if ((long)(i) >= -2147483648 && \
(long)(i) < 2147483648) \
PPC_LI32(d, i); \
else { \
if (!((uintptr_t)(i) & 0xffff800000000000ULL)) \
- PPC_LI(d, ((uintptr_t)(i) >> 32) & 0xffff); \
+ EMIT(PPC_RAW_LI(d, ((uintptr_t)(i) >> 32) & \
+ 0xffff)); \
else { \
- PPC_LIS(d, ((uintptr_t)(i) >> 48)); \
+ EMIT(PPC_RAW_LIS(d, ((uintptr_t)(i) >> 48))); \
if ((uintptr_t)(i) & 0x0000ffff00000000ULL) \
- PPC_ORI(d, d, \
- ((uintptr_t)(i) >> 32) & 0xffff); \
+ EMIT(PPC_RAW_ORI(d, d, \
+ ((uintptr_t)(i) >> 32) & 0xffff)); \
} \
- PPC_SLDI(d, d, 32); \
+ EMIT(PPC_RAW_SLDI(d, d, 32)); \
if ((uintptr_t)(i) & 0x00000000ffff0000ULL) \
- PPC_ORIS(d, d, \
- ((uintptr_t)(i) >> 16) & 0xffff); \
+ EMIT(PPC_RAW_ORIS(d, d, \
+ ((uintptr_t)(i) >> 16) & 0xffff)); \
if ((uintptr_t)(i) & 0x000000000000ffffULL) \
- PPC_ORI(d, d, (uintptr_t)(i) & 0xffff); \
+ EMIT(PPC_RAW_ORI(d, d, (uintptr_t)(i) & \
+ 0xffff)); \
} } while (0)
-
-#ifdef CONFIG_PPC64
-#define PPC_FUNC_ADDR(d,i) do { PPC_LI64(d, i); } while(0)
-#else
-#define PPC_FUNC_ADDR(d,i) do { PPC_LI32(d, i); } while(0)
#endif
-static inline bool is_nearbranch(int offset)
-{
- return (offset < 32768) && (offset >= -32768);
-}
-
/*
* The fly in the ointment of code size changing from pass to pass is
* avoided by padding the short branch case with a NOP. If code size differs
@@ -238,12 +91,12 @@ static inline bool is_nearbranch(int offset)
* state.
*/
#define PPC_BCC(cond, dest) do { \
- if (is_nearbranch((dest) - (ctx->idx * 4))) { \
+ if (is_offset_in_cond_branch_range((long)(dest) - CTX_NIA(ctx))) { \
PPC_BCC_SHORT(cond, dest); \
- PPC_NOP(); \
+ EMIT(PPC_RAW_NOP()); \
} else { \
/* Flip the 'T or F' bit to invert comparison */ \
- PPC_BCC_SHORT(cond ^ COND_CMP_TRUE, (ctx->idx+2)*4); \
+ PPC_BCC_SHORT(cond ^ COND_CMP_TRUE, CTX_NIA(ctx) + 2*4); \
PPC_JMP(dest); \
} } while(0)
@@ -262,6 +115,63 @@ static inline bool is_nearbranch(int offset)
#define COND_LT (CR0_LT | COND_CMP_TRUE)
#define COND_LE (CR0_GT | COND_CMP_FALSE)
+#define SEEN_FUNC 0x20000000 /* might call external helpers */
+#define SEEN_TAILCALL 0x40000000 /* uses tail calls */
+
+struct codegen_context {
+ /*
+ * This is used to track register usage as well
+ * as calls to external helpers.
+ * - register usage is tracked with corresponding
+ * bits (r3-r31)
+ * - rest of the bits can be used to track other
+ * things -- for now, we use bits 0 to 2
+ * encoded in SEEN_* macros above
+ */
+ unsigned int seen;
+ unsigned int idx;
+ unsigned int stack_size;
+ int b2p[MAX_BPF_JIT_REG + 2];
+ unsigned int exentry_idx;
+ unsigned int alt_exit_addr;
+};
+
+#define bpf_to_ppc(r) (ctx->b2p[r])
+
+#ifdef CONFIG_PPC32
+#define BPF_FIXUP_LEN 3 /* Three instructions => 12 bytes */
+#else
+#define BPF_FIXUP_LEN 2 /* Two instructions => 8 bytes */
+#endif
+
+static inline bool bpf_is_seen_register(struct codegen_context *ctx, int i)
+{
+ return ctx->seen & (1 << (31 - i));
+}
+
+static inline void bpf_set_seen_register(struct codegen_context *ctx, int i)
+{
+ ctx->seen |= 1 << (31 - i);
+}
+
+static inline void bpf_clear_seen_register(struct codegen_context *ctx, int i)
+{
+ ctx->seen &= ~(1 << (31 - i));
+}
+
+void bpf_jit_init_reg_mapping(struct codegen_context *ctx);
+int bpf_jit_emit_func_call_rel(u32 *image, u32 *fimage, struct codegen_context *ctx, u64 func);
+int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, u32 *fimage, struct codegen_context *ctx,
+ u32 *addrs, int pass, bool extra_pass);
+void bpf_jit_build_prologue(u32 *image, struct codegen_context *ctx);
+void bpf_jit_build_epilogue(u32 *image, struct codegen_context *ctx);
+void bpf_jit_realloc_regs(struct codegen_context *ctx);
+int bpf_jit_emit_exit_insn(u32 *image, struct codegen_context *ctx, int tmp_reg, long exit_addr);
+
+int bpf_add_extable_entry(struct bpf_prog *fp, u32 *image, u32 *fimage, int pass,
+ struct codegen_context *ctx, int insn_idx,
+ int jmp_off, int dst_reg);
+
#endif
#endif
generated by cgit (git 2.34.1) at 2024-05-09 18:54:01 +0000