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Diffstat (limited to 'arch/powerpc/net/bpf_jit_comp64.c')
-rw-r--r--arch/powerpc/net/bpf_jit_comp64.c440
1 files changed, 238 insertions, 202 deletions
diff --git a/arch/powerpc/net/bpf_jit_comp64.c b/arch/powerpc/net/bpf_jit_comp64.c
index e1e8c934308a..585f257da045 100644
--- a/arch/powerpc/net/bpf_jit_comp64.c
+++ b/arch/powerpc/net/bpf_jit_comp64.c
@@ -17,7 +17,60 @@
#include <linux/bpf.h>
#include <asm/security_features.h>
-#include "bpf_jit64.h"
+#include "bpf_jit.h"
+
+/*
+ * Stack layout:
+ * Ensure the top half (upto local_tmp_var) stays consistent
+ * with our redzone usage.
+ *
+ * [ prev sp ] <-------------
+ * [ nv gpr save area ] 5*8 |
+ * [ tail_call_cnt ] 8 |
+ * [ local_tmp_var ] 16 |
+ * fp (r31) --> [ ebpf stack space ] upto 512 |
+ * [ frame header ] 32/112 |
+ * sp (r1) ---> [ stack pointer ] --------------
+ */
+
+/* for gpr non volatile registers BPG_REG_6 to 10 */
+#define BPF_PPC_STACK_SAVE (5*8)
+/* for bpf JIT code internal usage */
+#define BPF_PPC_STACK_LOCALS 24
+/* stack frame excluding BPF stack, ensure this is quadword aligned */
+#define BPF_PPC_STACKFRAME (STACK_FRAME_MIN_SIZE + \
+ BPF_PPC_STACK_LOCALS + BPF_PPC_STACK_SAVE)
+
+/* BPF register usage */
+#define TMP_REG_1 (MAX_BPF_JIT_REG + 0)
+#define TMP_REG_2 (MAX_BPF_JIT_REG + 1)
+
+/* BPF to ppc register mappings */
+void bpf_jit_init_reg_mapping(struct codegen_context *ctx)
+{
+ /* function return value */
+ ctx->b2p[BPF_REG_0] = _R8;
+ /* function arguments */
+ ctx->b2p[BPF_REG_1] = _R3;
+ ctx->b2p[BPF_REG_2] = _R4;
+ ctx->b2p[BPF_REG_3] = _R5;
+ ctx->b2p[BPF_REG_4] = _R6;
+ ctx->b2p[BPF_REG_5] = _R7;
+ /* non volatile registers */
+ ctx->b2p[BPF_REG_6] = _R27;
+ ctx->b2p[BPF_REG_7] = _R28;
+ ctx->b2p[BPF_REG_8] = _R29;
+ ctx->b2p[BPF_REG_9] = _R30;
+ /* frame pointer aka BPF_REG_10 */
+ ctx->b2p[BPF_REG_FP] = _R31;
+ /* eBPF jit internal registers */
+ ctx->b2p[BPF_REG_AX] = _R12;
+ ctx->b2p[TMP_REG_1] = _R9;
+ ctx->b2p[TMP_REG_2] = _R10;
+}
+
+/* PPC NVR range -- update this if we ever use NVRs below r27 */
+#define BPF_PPC_NVR_MIN _R27
static inline bool bpf_has_stack_frame(struct codegen_context *ctx)
{
@@ -27,7 +80,7 @@ static inline bool bpf_has_stack_frame(struct codegen_context *ctx)
* - the bpf program uses its stack area
* The latter condition is deduced from the usage of BPF_REG_FP
*/
- return ctx->seen & SEEN_FUNC || bpf_is_seen_register(ctx, b2p[BPF_REG_FP]);
+ return ctx->seen & SEEN_FUNC || bpf_is_seen_register(ctx, bpf_to_ppc(BPF_REG_FP));
}
/*
@@ -73,22 +126,23 @@ void bpf_jit_build_prologue(u32 *image, struct codegen_context *ctx)
{
int i;
+ if (__is_defined(PPC64_ELF_ABI_v2))
+ EMIT(PPC_RAW_LD(_R2, _R13, offsetof(struct paca_struct, kernel_toc)));
+
/*
* Initialize tail_call_cnt if we do tail calls.
* Otherwise, put in NOPs so that it can be skipped when we are
* invoked through a tail call.
*/
if (ctx->seen & SEEN_TAILCALL) {
- EMIT(PPC_RAW_LI(b2p[TMP_REG_1], 0));
+ EMIT(PPC_RAW_LI(bpf_to_ppc(TMP_REG_1), 0));
/* this goes in the redzone */
- PPC_BPF_STL(b2p[TMP_REG_1], 1, -(BPF_PPC_STACK_SAVE + 8));
+ EMIT(PPC_RAW_STD(bpf_to_ppc(TMP_REG_1), _R1, -(BPF_PPC_STACK_SAVE + 8)));
} else {
EMIT(PPC_RAW_NOP());
EMIT(PPC_RAW_NOP());
}
-#define BPF_TAILCALL_PROLOGUE_SIZE 8
-
if (bpf_has_stack_frame(ctx)) {
/*
* We need a stack frame, but we don't necessarily need to
@@ -96,10 +150,10 @@ void bpf_jit_build_prologue(u32 *image, struct codegen_context *ctx)
*/
if (ctx->seen & SEEN_FUNC) {
EMIT(PPC_RAW_MFLR(_R0));
- PPC_BPF_STL(0, 1, PPC_LR_STKOFF);
+ EMIT(PPC_RAW_STD(_R0, _R1, PPC_LR_STKOFF));
}
- PPC_BPF_STLU(1, 1, -(BPF_PPC_STACKFRAME + ctx->stack_size));
+ EMIT(PPC_RAW_STDU(_R1, _R1, -(BPF_PPC_STACKFRAME + ctx->stack_size)));
}
/*
@@ -108,12 +162,12 @@ void bpf_jit_build_prologue(u32 *image, struct codegen_context *ctx)
* in the protected zone below the previous stack frame
*/
for (i = BPF_REG_6; i <= BPF_REG_10; i++)
- if (bpf_is_seen_register(ctx, b2p[i]))
- PPC_BPF_STL(b2p[i], 1, bpf_jit_stack_offsetof(ctx, b2p[i]));
+ if (bpf_is_seen_register(ctx, bpf_to_ppc(i)))
+ EMIT(PPC_RAW_STD(bpf_to_ppc(i), _R1, bpf_jit_stack_offsetof(ctx, bpf_to_ppc(i))));
/* Setup frame pointer to point to the bpf stack area */
- if (bpf_is_seen_register(ctx, b2p[BPF_REG_FP]))
- EMIT(PPC_RAW_ADDI(b2p[BPF_REG_FP], 1,
+ if (bpf_is_seen_register(ctx, bpf_to_ppc(BPF_REG_FP)))
+ EMIT(PPC_RAW_ADDI(bpf_to_ppc(BPF_REG_FP), _R1,
STACK_FRAME_MIN_SIZE + ctx->stack_size));
}
@@ -123,15 +177,15 @@ static void bpf_jit_emit_common_epilogue(u32 *image, struct codegen_context *ctx
/* Restore NVRs */
for (i = BPF_REG_6; i <= BPF_REG_10; i++)
- if (bpf_is_seen_register(ctx, b2p[i]))
- PPC_BPF_LL(b2p[i], 1, bpf_jit_stack_offsetof(ctx, b2p[i]));
+ if (bpf_is_seen_register(ctx, bpf_to_ppc(i)))
+ EMIT(PPC_RAW_LD(bpf_to_ppc(i), _R1, bpf_jit_stack_offsetof(ctx, bpf_to_ppc(i))));
/* Tear down our stack frame */
if (bpf_has_stack_frame(ctx)) {
- EMIT(PPC_RAW_ADDI(1, 1, BPF_PPC_STACKFRAME + ctx->stack_size));
+ EMIT(PPC_RAW_ADDI(_R1, _R1, BPF_PPC_STACKFRAME + ctx->stack_size));
if (ctx->seen & SEEN_FUNC) {
- PPC_BPF_LL(0, 1, PPC_LR_STKOFF);
- EMIT(PPC_RAW_MTLR(0));
+ EMIT(PPC_RAW_LD(_R0, _R1, PPC_LR_STKOFF));
+ EMIT(PPC_RAW_MTLR(_R0));
}
}
}
@@ -141,42 +195,45 @@ void bpf_jit_build_epilogue(u32 *image, struct codegen_context *ctx)
bpf_jit_emit_common_epilogue(image, ctx);
/* Move result to r3 */
- EMIT(PPC_RAW_MR(3, b2p[BPF_REG_0]));
+ EMIT(PPC_RAW_MR(_R3, bpf_to_ppc(BPF_REG_0)));
EMIT(PPC_RAW_BLR());
}
-static void bpf_jit_emit_func_call_hlp(u32 *image, struct codegen_context *ctx,
- u64 func)
+static int bpf_jit_emit_func_call_hlp(u32 *image, struct codegen_context *ctx, u64 func)
{
-#ifdef PPC64_ELF_ABI_v1
- /* func points to the function descriptor */
- PPC_LI64(b2p[TMP_REG_2], func);
- /* Load actual entry point from function descriptor */
- PPC_BPF_LL(b2p[TMP_REG_1], b2p[TMP_REG_2], 0);
- /* ... and move it to CTR */
- EMIT(PPC_RAW_MTCTR(b2p[TMP_REG_1]));
- /*
- * Load TOC from function descriptor at offset 8.
- * We can clobber r2 since we get called through a
- * function pointer (so caller will save/restore r2)
- * and since we don't use a TOC ourself.
- */
- PPC_BPF_LL(2, b2p[TMP_REG_2], 8);
-#else
- /* We can clobber r12 */
- PPC_FUNC_ADDR(12, func);
- EMIT(PPC_RAW_MTCTR(12));
-#endif
+ unsigned long func_addr = func ? ppc_function_entry((void *)func) : 0;
+ long reladdr;
+
+ if (WARN_ON_ONCE(!core_kernel_text(func_addr)))
+ return -EINVAL;
+
+ reladdr = func_addr - kernel_toc_addr();
+ if (reladdr > 0x7FFFFFFF || reladdr < -(0x80000000L)) {
+ pr_err("eBPF: address of %ps out of range of kernel_toc.\n", (void *)func);
+ return -ERANGE;
+ }
+
+ EMIT(PPC_RAW_ADDIS(_R12, _R2, PPC_HA(reladdr)));
+ EMIT(PPC_RAW_ADDI(_R12, _R12, PPC_LO(reladdr)));
+ EMIT(PPC_RAW_MTCTR(_R12));
EMIT(PPC_RAW_BCTRL());
+
+ return 0;
}
-void bpf_jit_emit_func_call_rel(u32 *image, struct codegen_context *ctx, u64 func)
+int bpf_jit_emit_func_call_rel(u32 *image, struct codegen_context *ctx, u64 func)
{
unsigned int i, ctx_idx = ctx->idx;
+ if (WARN_ON_ONCE(func && is_module_text_address(func)))
+ return -EINVAL;
+
+ /* skip past descriptor if elf v1 */
+ func += FUNCTION_DESCR_SIZE;
+
/* Load function address into r12 */
- PPC_LI64(12, func);
+ PPC_LI64(_R12, func);
/* For bpf-to-bpf function calls, the callee's address is unknown
* until the last extra pass. As seen above, we use PPC_LI64() to
@@ -191,20 +248,10 @@ void bpf_jit_emit_func_call_rel(u32 *image, struct codegen_context *ctx, u64 fun
for (i = ctx->idx - ctx_idx; i < 5; i++)
EMIT(PPC_RAW_NOP());
-#ifdef PPC64_ELF_ABI_v1
- /*
- * Load TOC from function descriptor at offset 8.
- * We can clobber r2 since we get called through a
- * function pointer (so caller will save/restore r2)
- * and since we don't use a TOC ourself.
- */
- PPC_BPF_LL(2, 12, 8);
- /* Load actual entry point from function descriptor */
- PPC_BPF_LL(12, 12, 0);
-#endif
-
- EMIT(PPC_RAW_MTCTR(12));
+ EMIT(PPC_RAW_MTCTR(_R12));
EMIT(PPC_RAW_BCTRL());
+
+ return 0;
}
static int bpf_jit_emit_tail_call(u32 *image, struct codegen_context *ctx, u32 out)
@@ -215,54 +262,53 @@ static int bpf_jit_emit_tail_call(u32 *image, struct codegen_context *ctx, u32 o
* r4/BPF_REG_2 - pointer to bpf_array
* r5/BPF_REG_3 - index in bpf_array
*/
- int b2p_bpf_array = b2p[BPF_REG_2];
- int b2p_index = b2p[BPF_REG_3];
+ int b2p_bpf_array = bpf_to_ppc(BPF_REG_2);
+ int b2p_index = bpf_to_ppc(BPF_REG_3);
+ int bpf_tailcall_prologue_size = 8;
+
+ if (__is_defined(PPC64_ELF_ABI_v2))
+ bpf_tailcall_prologue_size += 4; /* skip past the toc load */
/*
* if (index >= array->map.max_entries)
* goto out;
*/
- EMIT(PPC_RAW_LWZ(b2p[TMP_REG_1], b2p_bpf_array, offsetof(struct bpf_array, map.max_entries)));
+ EMIT(PPC_RAW_LWZ(bpf_to_ppc(TMP_REG_1), b2p_bpf_array, offsetof(struct bpf_array, map.max_entries)));
EMIT(PPC_RAW_RLWINM(b2p_index, b2p_index, 0, 0, 31));
- EMIT(PPC_RAW_CMPLW(b2p_index, b2p[TMP_REG_1]));
- PPC_BCC(COND_GE, out);
+ EMIT(PPC_RAW_CMPLW(b2p_index, bpf_to_ppc(TMP_REG_1)));
+ PPC_BCC_SHORT(COND_GE, out);
/*
* if (tail_call_cnt >= MAX_TAIL_CALL_CNT)
* goto out;
*/
- PPC_BPF_LL(b2p[TMP_REG_1], 1, bpf_jit_stack_tailcallcnt(ctx));
- EMIT(PPC_RAW_CMPLWI(b2p[TMP_REG_1], MAX_TAIL_CALL_CNT));
- PPC_BCC(COND_GE, out);
+ EMIT(PPC_RAW_LD(bpf_to_ppc(TMP_REG_1), _R1, bpf_jit_stack_tailcallcnt(ctx)));
+ EMIT(PPC_RAW_CMPLWI(bpf_to_ppc(TMP_REG_1), MAX_TAIL_CALL_CNT));
+ PPC_BCC_SHORT(COND_GE, out);
/*
* tail_call_cnt++;
*/
- EMIT(PPC_RAW_ADDI(b2p[TMP_REG_1], b2p[TMP_REG_1], 1));
- PPC_BPF_STL(b2p[TMP_REG_1], 1, bpf_jit_stack_tailcallcnt(ctx));
+ EMIT(PPC_RAW_ADDI(bpf_to_ppc(TMP_REG_1), bpf_to_ppc(TMP_REG_1), 1));
+ EMIT(PPC_RAW_STD(bpf_to_ppc(TMP_REG_1), _R1, bpf_jit_stack_tailcallcnt(ctx)));
/* prog = array->ptrs[index]; */
- EMIT(PPC_RAW_MULI(b2p[TMP_REG_1], b2p_index, 8));
- EMIT(PPC_RAW_ADD(b2p[TMP_REG_1], b2p[TMP_REG_1], b2p_bpf_array));
- PPC_BPF_LL(b2p[TMP_REG_1], b2p[TMP_REG_1], offsetof(struct bpf_array, ptrs));
+ EMIT(PPC_RAW_MULI(bpf_to_ppc(TMP_REG_1), b2p_index, 8));
+ EMIT(PPC_RAW_ADD(bpf_to_ppc(TMP_REG_1), bpf_to_ppc(TMP_REG_1), b2p_bpf_array));
+ EMIT(PPC_RAW_LD(bpf_to_ppc(TMP_REG_1), bpf_to_ppc(TMP_REG_1), offsetof(struct bpf_array, ptrs)));
/*
* if (prog == NULL)
* goto out;
*/
- EMIT(PPC_RAW_CMPLDI(b2p[TMP_REG_1], 0));
- PPC_BCC(COND_EQ, out);
+ EMIT(PPC_RAW_CMPLDI(bpf_to_ppc(TMP_REG_1), 0));
+ PPC_BCC_SHORT(COND_EQ, out);
/* goto *(prog->bpf_func + prologue_size); */
- PPC_BPF_LL(b2p[TMP_REG_1], b2p[TMP_REG_1], offsetof(struct bpf_prog, bpf_func));
-#ifdef PPC64_ELF_ABI_v1
- /* skip past the function descriptor */
- EMIT(PPC_RAW_ADDI(b2p[TMP_REG_1], b2p[TMP_REG_1],
- FUNCTION_DESCR_SIZE + BPF_TAILCALL_PROLOGUE_SIZE));
-#else
- EMIT(PPC_RAW_ADDI(b2p[TMP_REG_1], b2p[TMP_REG_1], BPF_TAILCALL_PROLOGUE_SIZE));
-#endif
- EMIT(PPC_RAW_MTCTR(b2p[TMP_REG_1]));
+ EMIT(PPC_RAW_LD(bpf_to_ppc(TMP_REG_1), bpf_to_ppc(TMP_REG_1), offsetof(struct bpf_prog, bpf_func)));
+ EMIT(PPC_RAW_ADDI(bpf_to_ppc(TMP_REG_1), bpf_to_ppc(TMP_REG_1),
+ FUNCTION_DESCR_SIZE + bpf_tailcall_prologue_size));
+ EMIT(PPC_RAW_MTCTR(bpf_to_ppc(TMP_REG_1)));
/* tear down stack, restore NVRs, ... */
bpf_jit_emit_common_epilogue(image, ctx);
@@ -309,9 +355,11 @@ int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, struct codegen_context *
for (i = 0; i < flen; i++) {
u32 code = insn[i].code;
- u32 dst_reg = b2p[insn[i].dst_reg];
- u32 src_reg = b2p[insn[i].src_reg];
+ u32 dst_reg = bpf_to_ppc(insn[i].dst_reg);
+ u32 src_reg = bpf_to_ppc(insn[i].src_reg);
u32 size = BPF_SIZE(code);
+ u32 tmp1_reg = bpf_to_ppc(TMP_REG_1);
+ u32 tmp2_reg = bpf_to_ppc(TMP_REG_2);
s16 off = insn[i].off;
s32 imm = insn[i].imm;
bool func_addr_fixed;
@@ -362,8 +410,8 @@ int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, struct codegen_context *
} else if (imm >= -32768 && imm < 32768) {
EMIT(PPC_RAW_ADDI(dst_reg, dst_reg, IMM_L(imm)));
} else {
- PPC_LI32(b2p[TMP_REG_1], imm);
- EMIT(PPC_RAW_ADD(dst_reg, dst_reg, b2p[TMP_REG_1]));
+ PPC_LI32(tmp1_reg, imm);
+ EMIT(PPC_RAW_ADD(dst_reg, dst_reg, tmp1_reg));
}
goto bpf_alu32_trunc;
case BPF_ALU | BPF_SUB | BPF_K: /* (u32) dst -= (u32) imm */
@@ -373,8 +421,8 @@ int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, struct codegen_context *
} else if (imm > -32768 && imm <= 32768) {
EMIT(PPC_RAW_ADDI(dst_reg, dst_reg, IMM_L(-imm)));
} else {
- PPC_LI32(b2p[TMP_REG_1], imm);
- EMIT(PPC_RAW_SUB(dst_reg, dst_reg, b2p[TMP_REG_1]));
+ PPC_LI32(tmp1_reg, imm);
+ EMIT(PPC_RAW_SUB(dst_reg, dst_reg, tmp1_reg));
}
goto bpf_alu32_trunc;
case BPF_ALU | BPF_MUL | BPF_X: /* (u32) dst *= (u32) src */
@@ -389,32 +437,28 @@ int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, struct codegen_context *
if (imm >= -32768 && imm < 32768)
EMIT(PPC_RAW_MULI(dst_reg, dst_reg, IMM_L(imm)));
else {
- PPC_LI32(b2p[TMP_REG_1], imm);
+ PPC_LI32(tmp1_reg, imm);
if (BPF_CLASS(code) == BPF_ALU)
- EMIT(PPC_RAW_MULW(dst_reg, dst_reg,
- b2p[TMP_REG_1]));
+ EMIT(PPC_RAW_MULW(dst_reg, dst_reg, tmp1_reg));
else
- EMIT(PPC_RAW_MULD(dst_reg, dst_reg,
- b2p[TMP_REG_1]));
+ EMIT(PPC_RAW_MULD(dst_reg, dst_reg, tmp1_reg));
}
goto bpf_alu32_trunc;
case BPF_ALU | BPF_DIV | BPF_X: /* (u32) dst /= (u32) src */
case BPF_ALU | BPF_MOD | BPF_X: /* (u32) dst %= (u32) src */
if (BPF_OP(code) == BPF_MOD) {
- EMIT(PPC_RAW_DIVWU(b2p[TMP_REG_1], dst_reg, src_reg));
- EMIT(PPC_RAW_MULW(b2p[TMP_REG_1], src_reg,
- b2p[TMP_REG_1]));
- EMIT(PPC_RAW_SUB(dst_reg, dst_reg, b2p[TMP_REG_1]));
+ EMIT(PPC_RAW_DIVWU(tmp1_reg, dst_reg, src_reg));
+ EMIT(PPC_RAW_MULW(tmp1_reg, src_reg, tmp1_reg));
+ EMIT(PPC_RAW_SUB(dst_reg, dst_reg, tmp1_reg));
} else
EMIT(PPC_RAW_DIVWU(dst_reg, dst_reg, src_reg));
goto bpf_alu32_trunc;
case BPF_ALU64 | BPF_DIV | BPF_X: /* dst /= src */
case BPF_ALU64 | BPF_MOD | BPF_X: /* dst %= src */
if (BPF_OP(code) == BPF_MOD) {
- EMIT(PPC_RAW_DIVDU(b2p[TMP_REG_1], dst_reg, src_reg));
- EMIT(PPC_RAW_MULD(b2p[TMP_REG_1], src_reg,
- b2p[TMP_REG_1]));
- EMIT(PPC_RAW_SUB(dst_reg, dst_reg, b2p[TMP_REG_1]));
+ EMIT(PPC_RAW_DIVDU(tmp1_reg, dst_reg, src_reg));
+ EMIT(PPC_RAW_MULD(tmp1_reg, src_reg, tmp1_reg));
+ EMIT(PPC_RAW_SUB(dst_reg, dst_reg, tmp1_reg));
} else
EMIT(PPC_RAW_DIVDU(dst_reg, dst_reg, src_reg));
break;
@@ -433,35 +477,23 @@ int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, struct codegen_context *
}
}
- PPC_LI32(b2p[TMP_REG_1], imm);
+ PPC_LI32(tmp1_reg, imm);
switch (BPF_CLASS(code)) {
case BPF_ALU:
if (BPF_OP(code) == BPF_MOD) {
- EMIT(PPC_RAW_DIVWU(b2p[TMP_REG_2],
- dst_reg,
- b2p[TMP_REG_1]));
- EMIT(PPC_RAW_MULW(b2p[TMP_REG_1],
- b2p[TMP_REG_1],
- b2p[TMP_REG_2]));
- EMIT(PPC_RAW_SUB(dst_reg, dst_reg,
- b2p[TMP_REG_1]));
+ EMIT(PPC_RAW_DIVWU(tmp2_reg, dst_reg, tmp1_reg));
+ EMIT(PPC_RAW_MULW(tmp1_reg, tmp1_reg, tmp2_reg));
+ EMIT(PPC_RAW_SUB(dst_reg, dst_reg, tmp1_reg));
} else
- EMIT(PPC_RAW_DIVWU(dst_reg, dst_reg,
- b2p[TMP_REG_1]));
+ EMIT(PPC_RAW_DIVWU(dst_reg, dst_reg, tmp1_reg));
break;
case BPF_ALU64:
if (BPF_OP(code) == BPF_MOD) {
- EMIT(PPC_RAW_DIVDU(b2p[TMP_REG_2],
- dst_reg,
- b2p[TMP_REG_1]));
- EMIT(PPC_RAW_MULD(b2p[TMP_REG_1],
- b2p[TMP_REG_1],
- b2p[TMP_REG_2]));
- EMIT(PPC_RAW_SUB(dst_reg, dst_reg,
- b2p[TMP_REG_1]));
+ EMIT(PPC_RAW_DIVDU(tmp2_reg, dst_reg, tmp1_reg));
+ EMIT(PPC_RAW_MULD(tmp1_reg, tmp1_reg, tmp2_reg));
+ EMIT(PPC_RAW_SUB(dst_reg, dst_reg, tmp1_reg));
} else
- EMIT(PPC_RAW_DIVDU(dst_reg, dst_reg,
- b2p[TMP_REG_1]));
+ EMIT(PPC_RAW_DIVDU(dst_reg, dst_reg, tmp1_reg));
break;
}
goto bpf_alu32_trunc;
@@ -483,8 +515,8 @@ int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, struct codegen_context *
EMIT(PPC_RAW_ANDI(dst_reg, dst_reg, IMM_L(imm)));
else {
/* Sign-extended */
- PPC_LI32(b2p[TMP_REG_1], imm);
- EMIT(PPC_RAW_AND(dst_reg, dst_reg, b2p[TMP_REG_1]));
+ PPC_LI32(tmp1_reg, imm);
+ EMIT(PPC_RAW_AND(dst_reg, dst_reg, tmp1_reg));
}
goto bpf_alu32_trunc;
case BPF_ALU | BPF_OR | BPF_X: /* dst = (u32) dst | (u32) src */
@@ -495,8 +527,8 @@ int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, struct codegen_context *
case BPF_ALU64 | BPF_OR | BPF_K:/* dst = dst | imm */
if (imm < 0 && BPF_CLASS(code) == BPF_ALU64) {
/* Sign-extended */
- PPC_LI32(b2p[TMP_REG_1], imm);
- EMIT(PPC_RAW_OR(dst_reg, dst_reg, b2p[TMP_REG_1]));
+ PPC_LI32(tmp1_reg, imm);
+ EMIT(PPC_RAW_OR(dst_reg, dst_reg, tmp1_reg));
} else {
if (IMM_L(imm))
EMIT(PPC_RAW_ORI(dst_reg, dst_reg, IMM_L(imm)));
@@ -512,8 +544,8 @@ int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, struct codegen_context *
case BPF_ALU64 | BPF_XOR | BPF_K: /* dst ^= imm */
if (imm < 0 && BPF_CLASS(code) == BPF_ALU64) {
/* Sign-extended */
- PPC_LI32(b2p[TMP_REG_1], imm);
- EMIT(PPC_RAW_XOR(dst_reg, dst_reg, b2p[TMP_REG_1]));
+ PPC_LI32(tmp1_reg, imm);
+ EMIT(PPC_RAW_XOR(dst_reg, dst_reg, tmp1_reg));
} else {
if (IMM_L(imm))
EMIT(PPC_RAW_XORI(dst_reg, dst_reg, IMM_L(imm)));
@@ -614,11 +646,11 @@ bpf_alu32_trunc:
switch (imm) {
case 16:
/* Rotate 8 bits left & mask with 0x0000ff00 */
- EMIT(PPC_RAW_RLWINM(b2p[TMP_REG_1], dst_reg, 8, 16, 23));
+ EMIT(PPC_RAW_RLWINM(tmp1_reg, dst_reg, 8, 16, 23));
/* Rotate 8 bits right & insert LSB to reg */
- EMIT(PPC_RAW_RLWIMI(b2p[TMP_REG_1], dst_reg, 24, 24, 31));
+ EMIT(PPC_RAW_RLWIMI(tmp1_reg, dst_reg, 24, 24, 31));
/* Move result back to dst_reg */
- EMIT(PPC_RAW_MR(dst_reg, b2p[TMP_REG_1]));
+ EMIT(PPC_RAW_MR(dst_reg, tmp1_reg));
break;
case 32:
/*
@@ -626,28 +658,28 @@ bpf_alu32_trunc:
* 2 bytes are already in their final position
* -- byte 2 and 4 (of bytes 1, 2, 3 and 4)
*/
- EMIT(PPC_RAW_RLWINM(b2p[TMP_REG_1], dst_reg, 8, 0, 31));
+ EMIT(PPC_RAW_RLWINM(tmp1_reg, dst_reg, 8, 0, 31));
/* Rotate 24 bits and insert byte 1 */
- EMIT(PPC_RAW_RLWIMI(b2p[TMP_REG_1], dst_reg, 24, 0, 7));
+ EMIT(PPC_RAW_RLWIMI(tmp1_reg, dst_reg, 24, 0, 7));
/* Rotate 24 bits and insert byte 3 */
- EMIT(PPC_RAW_RLWIMI(b2p[TMP_REG_1], dst_reg, 24, 16, 23));
- EMIT(PPC_RAW_MR(dst_reg, b2p[TMP_REG_1]));
+ EMIT(PPC_RAW_RLWIMI(tmp1_reg, dst_reg, 24, 16, 23));
+ EMIT(PPC_RAW_MR(dst_reg, tmp1_reg));
break;
case 64:
/* Store the value to stack and then use byte-reverse loads */
- PPC_BPF_STL(dst_reg, 1, bpf_jit_stack_local(ctx));
- EMIT(PPC_RAW_ADDI(b2p[TMP_REG_1], 1, bpf_jit_stack_local(ctx)));
+ EMIT(PPC_RAW_STD(dst_reg, _R1, bpf_jit_stack_local(ctx)));
+ EMIT(PPC_RAW_ADDI(tmp1_reg, _R1, bpf_jit_stack_local(ctx)));
if (cpu_has_feature(CPU_FTR_ARCH_206)) {
- EMIT(PPC_RAW_LDBRX(dst_reg, 0, b2p[TMP_REG_1]));
+ EMIT(PPC_RAW_LDBRX(dst_reg, 0, tmp1_reg));
} else {
- EMIT(PPC_RAW_LWBRX(dst_reg, 0, b2p[TMP_REG_1]));
+ EMIT(PPC_RAW_LWBRX(dst_reg, 0, tmp1_reg));
if (IS_ENABLED(CONFIG_CPU_LITTLE_ENDIAN))
EMIT(PPC_RAW_SLDI(dst_reg, dst_reg, 32));
- EMIT(PPC_RAW_LI(b2p[TMP_REG_2], 4));
- EMIT(PPC_RAW_LWBRX(b2p[TMP_REG_2], b2p[TMP_REG_2], b2p[TMP_REG_1]));
+ EMIT(PPC_RAW_LI(tmp2_reg, 4));
+ EMIT(PPC_RAW_LWBRX(tmp2_reg, tmp2_reg, tmp1_reg));
if (IS_ENABLED(CONFIG_CPU_BIG_ENDIAN))
- EMIT(PPC_RAW_SLDI(b2p[TMP_REG_2], b2p[TMP_REG_2], 32));
- EMIT(PPC_RAW_OR(dst_reg, dst_reg, b2p[TMP_REG_2]));
+ EMIT(PPC_RAW_SLDI(tmp2_reg, tmp2_reg, 32));
+ EMIT(PPC_RAW_OR(dst_reg, dst_reg, tmp2_reg));
}
break;
}
@@ -686,15 +718,14 @@ emit_clear:
break;
case STF_BARRIER_SYNC_ORI:
EMIT(PPC_RAW_SYNC());
- EMIT(PPC_RAW_LD(b2p[TMP_REG_1], _R13, 0));
+ EMIT(PPC_RAW_LD(tmp1_reg, _R13, 0));
EMIT(PPC_RAW_ORI(_R31, _R31, 0));
break;
case STF_BARRIER_FALLBACK:
- EMIT(PPC_RAW_MFLR(b2p[TMP_REG_1]));
- PPC_LI64(12, dereference_kernel_function_descriptor(bpf_stf_barrier));
- EMIT(PPC_RAW_MTCTR(12));
+ ctx->seen |= SEEN_FUNC;
+ PPC_LI64(_R12, dereference_kernel_function_descriptor(bpf_stf_barrier));
+ EMIT(PPC_RAW_MTCTR(_R12));
EMIT(PPC_RAW_BCTRL());
- EMIT(PPC_RAW_MTLR(b2p[TMP_REG_1]));
break;
case STF_BARRIER_NONE:
break;
@@ -707,34 +738,39 @@ emit_clear:
case BPF_STX | BPF_MEM | BPF_B: /* *(u8 *)(dst + off) = src */
case BPF_ST | BPF_MEM | BPF_B: /* *(u8 *)(dst + off) = imm */
if (BPF_CLASS(code) == BPF_ST) {
- EMIT(PPC_RAW_LI(b2p[TMP_REG_1], imm));
- src_reg = b2p[TMP_REG_1];
+ EMIT(PPC_RAW_LI(tmp1_reg, imm));
+ src_reg = tmp1_reg;
}
EMIT(PPC_RAW_STB(src_reg, dst_reg, off));
break;
case BPF_STX | BPF_MEM | BPF_H: /* (u16 *)(dst + off) = src */
case BPF_ST | BPF_MEM | BPF_H: /* (u16 *)(dst + off) = imm */
if (BPF_CLASS(code) == BPF_ST) {
- EMIT(PPC_RAW_LI(b2p[TMP_REG_1], imm));
- src_reg = b2p[TMP_REG_1];
+ EMIT(PPC_RAW_LI(tmp1_reg, imm));
+ src_reg = tmp1_reg;
}
EMIT(PPC_RAW_STH(src_reg, dst_reg, off));
break;
case BPF_STX | BPF_MEM | BPF_W: /* *(u32 *)(dst + off) = src */
case BPF_ST | BPF_MEM | BPF_W: /* *(u32 *)(dst + off) = imm */
if (BPF_CLASS(code) == BPF_ST) {
- PPC_LI32(b2p[TMP_REG_1], imm);
- src_reg = b2p[TMP_REG_1];
+ PPC_LI32(tmp1_reg, imm);
+ src_reg = tmp1_reg;
}
EMIT(PPC_RAW_STW(src_reg, dst_reg, off));
break;
case BPF_STX | BPF_MEM | BPF_DW: /* (u64 *)(dst + off) = src */
case BPF_ST | BPF_MEM | BPF_DW: /* *(u64 *)(dst + off) = imm */
if (BPF_CLASS(code) == BPF_ST) {
- PPC_LI32(b2p[TMP_REG_1], imm);
- src_reg = b2p[TMP_REG_1];
+ PPC_LI32(tmp1_reg, imm);
+ src_reg = tmp1_reg;
+ }
+ if (off % 4) {
+ EMIT(PPC_RAW_LI(tmp2_reg, off));
+ EMIT(PPC_RAW_STDX(src_reg, dst_reg, tmp2_reg));
+ } else {
+ EMIT(PPC_RAW_STD(src_reg, dst_reg, off));
}
- PPC_BPF_STL(src_reg, dst_reg, off);
break;
/*
@@ -751,14 +787,14 @@ emit_clear:
/* *(u32 *)(dst + off) += src */
/* Get EA into TMP_REG_1 */
- EMIT(PPC_RAW_ADDI(b2p[TMP_REG_1], dst_reg, off));
+ EMIT(PPC_RAW_ADDI(tmp1_reg, dst_reg, off));
tmp_idx = ctx->idx * 4;
/* load value from memory into TMP_REG_2 */
- EMIT(PPC_RAW_LWARX(b2p[TMP_REG_2], 0, b2p[TMP_REG_1], 0));
+ EMIT(PPC_RAW_LWARX(tmp2_reg, 0, tmp1_reg, 0));
/* add value from src_reg into this */
- EMIT(PPC_RAW_ADD(b2p[TMP_REG_2], b2p[TMP_REG_2], src_reg));
+ EMIT(PPC_RAW_ADD(tmp2_reg, tmp2_reg, src_reg));
/* store result back */
- EMIT(PPC_RAW_STWCX(b2p[TMP_REG_2], 0, b2p[TMP_REG_1]));
+ EMIT(PPC_RAW_STWCX(tmp2_reg, 0, tmp1_reg));
/* we're done if this succeeded */
PPC_BCC_SHORT(COND_NE, tmp_idx);
break;
@@ -771,11 +807,11 @@ emit_clear:
}
/* *(u64 *)(dst + off) += src */
- EMIT(PPC_RAW_ADDI(b2p[TMP_REG_1], dst_reg, off));
+ EMIT(PPC_RAW_ADDI(tmp1_reg, dst_reg, off));
tmp_idx = ctx->idx * 4;
- EMIT(PPC_RAW_LDARX(b2p[TMP_REG_2], 0, b2p[TMP_REG_1], 0));
- EMIT(PPC_RAW_ADD(b2p[TMP_REG_2], b2p[TMP_REG_2], src_reg));
- EMIT(PPC_RAW_STDCX(b2p[TMP_REG_2], 0, b2p[TMP_REG_1]));
+ EMIT(PPC_RAW_LDARX(tmp2_reg, 0, tmp1_reg, 0));
+ EMIT(PPC_RAW_ADD(tmp2_reg, tmp2_reg, src_reg));
+ EMIT(PPC_RAW_STDCX(tmp2_reg, 0, tmp1_reg));
PPC_BCC_SHORT(COND_NE, tmp_idx);
break;
@@ -801,18 +837,17 @@ emit_clear:
* set dst_reg=0 and move on.
*/
if (BPF_MODE(code) == BPF_PROBE_MEM) {
- EMIT(PPC_RAW_ADDI(b2p[TMP_REG_1], src_reg, off));
+ EMIT(PPC_RAW_ADDI(tmp1_reg, src_reg, off));
if (IS_ENABLED(CONFIG_PPC_BOOK3E_64))
- PPC_LI64(b2p[TMP_REG_2], 0x8000000000000000ul);
+ PPC_LI64(tmp2_reg, 0x8000000000000000ul);
else /* BOOK3S_64 */
- PPC_LI64(b2p[TMP_REG_2], PAGE_OFFSET);
- EMIT(PPC_RAW_CMPLD(b2p[TMP_REG_1], b2p[TMP_REG_2]));
- PPC_BCC(COND_GT, (ctx->idx + 4) * 4);
+ PPC_LI64(tmp2_reg, PAGE_OFFSET);
+ EMIT(PPC_RAW_CMPLD(tmp1_reg, tmp2_reg));
+ PPC_BCC_SHORT(COND_GT, (ctx->idx + 3) * 4);
EMIT(PPC_RAW_LI(dst_reg, 0));
/*
- * Check if 'off' is word aligned because PPC_BPF_LL()
- * (BPF_DW case) generates two instructions if 'off' is not
- * word-aligned and one instruction otherwise.
+ * Check if 'off' is word aligned for BPF_DW, because
+ * we might generate two instructions.
*/
if (BPF_SIZE(code) == BPF_DW && (off & 3))
PPC_JMP((ctx->idx + 3) * 4);
@@ -831,7 +866,12 @@ emit_clear:
EMIT(PPC_RAW_LWZ(dst_reg, src_reg, off));
break;
case BPF_DW:
- PPC_BPF_LL(dst_reg, src_reg, off);
+ if (off % 4) {
+ EMIT(PPC_RAW_LI(tmp1_reg, off));
+ EMIT(PPC_RAW_LDX(dst_reg, src_reg, tmp1_reg));
+ } else {
+ EMIT(PPC_RAW_LD(dst_reg, src_reg, off));
+ }
break;
}
@@ -871,8 +911,11 @@ emit_clear:
* the epilogue. If we _are_ the last instruction,
* we'll just fall through to the epilogue.
*/
- if (i != flen - 1)
- PPC_JMP(exit_addr);
+ if (i != flen - 1) {
+ ret = bpf_jit_emit_exit_insn(image, ctx, tmp1_reg, exit_addr);
+ if (ret)
+ return ret;
+ }
/* else fall through to the epilogue */
break;
@@ -888,11 +931,15 @@ emit_clear:
return ret;
if (func_addr_fixed)
- bpf_jit_emit_func_call_hlp(image, ctx, func_addr);
+ ret = bpf_jit_emit_func_call_hlp(image, ctx, func_addr);
else
- bpf_jit_emit_func_call_rel(image, ctx, func_addr);
+ ret = bpf_jit_emit_func_call_rel(image, ctx, func_addr);
+
+ if (ret)
+ return ret;
+
/* move return value from r3 to BPF_REG_0 */
- EMIT(PPC_RAW_MR(b2p[BPF_REG_0], 3));
+ EMIT(PPC_RAW_MR(bpf_to_ppc(BPF_REG_0), _R3));
break;
/*
@@ -998,14 +1045,10 @@ cond_branch:
case BPF_JMP | BPF_JSET | BPF_X:
case BPF_JMP32 | BPF_JSET | BPF_X:
if (BPF_CLASS(code) == BPF_JMP) {
- EMIT(PPC_RAW_AND_DOT(b2p[TMP_REG_1], dst_reg,
- src_reg));
+ EMIT(PPC_RAW_AND_DOT(tmp1_reg, dst_reg, src_reg));
} else {
- int tmp_reg = b2p[TMP_REG_1];
-
- EMIT(PPC_RAW_AND(tmp_reg, dst_reg, src_reg));
- EMIT(PPC_RAW_RLWINM_DOT(tmp_reg, tmp_reg, 0, 0,
- 31));
+ EMIT(PPC_RAW_AND(tmp1_reg, dst_reg, src_reg));
+ EMIT(PPC_RAW_RLWINM_DOT(tmp1_reg, tmp1_reg, 0, 0, 31));
}
break;
case BPF_JMP | BPF_JNE | BPF_K:
@@ -1034,14 +1077,12 @@ cond_branch:
EMIT(PPC_RAW_CMPLDI(dst_reg, imm));
} else {
/* sign-extending load */
- PPC_LI32(b2p[TMP_REG_1], imm);
+ PPC_LI32(tmp1_reg, imm);
/* ... but unsigned comparison */
if (is_jmp32)
- EMIT(PPC_RAW_CMPLW(dst_reg,
- b2p[TMP_REG_1]));
+ EMIT(PPC_RAW_CMPLW(dst_reg, tmp1_reg));
else
- EMIT(PPC_RAW_CMPLD(dst_reg,
- b2p[TMP_REG_1]));
+ EMIT(PPC_RAW_CMPLD(dst_reg, tmp1_reg));
}
break;
}
@@ -1066,13 +1107,11 @@ cond_branch:
else
EMIT(PPC_RAW_CMPDI(dst_reg, imm));
} else {
- PPC_LI32(b2p[TMP_REG_1], imm);
+ PPC_LI32(tmp1_reg, imm);
if (is_jmp32)
- EMIT(PPC_RAW_CMPW(dst_reg,
- b2p[TMP_REG_1]));
+ EMIT(PPC_RAW_CMPW(dst_reg, tmp1_reg));
else
- EMIT(PPC_RAW_CMPD(dst_reg,
- b2p[TMP_REG_1]));
+ EMIT(PPC_RAW_CMPD(dst_reg, tmp1_reg));
}
break;
}
@@ -1081,19 +1120,16 @@ cond_branch:
/* andi does not sign-extend the immediate */
if (imm >= 0 && imm < 32768)
/* PPC_ANDI is _only/always_ dot-form */
- EMIT(PPC_RAW_ANDI(b2p[TMP_REG_1], dst_reg, imm));
+ EMIT(PPC_RAW_ANDI(tmp1_reg, dst_reg, imm));
else {
- int tmp_reg = b2p[TMP_REG_1];
-
- PPC_LI32(tmp_reg, imm);
+ PPC_LI32(tmp1_reg, imm);
if (BPF_CLASS(code) == BPF_JMP) {
- EMIT(PPC_RAW_AND_DOT(tmp_reg, dst_reg,
- tmp_reg));
+ EMIT(PPC_RAW_AND_DOT(tmp1_reg, dst_reg,
+ tmp1_reg));
} else {
- EMIT(PPC_RAW_AND(tmp_reg, dst_reg,
- tmp_reg));
- EMIT(PPC_RAW_RLWINM_DOT(tmp_reg, tmp_reg,
- 0, 0, 31));
+ EMIT(PPC_RAW_AND(tmp1_reg, dst_reg, tmp1_reg));
+ EMIT(PPC_RAW_RLWINM_DOT(tmp1_reg, tmp1_reg,
+ 0, 0, 31));
}
}
break;
generated by cgit (git 2.34.1) at 2024-06-15 06:15:00 +0000