// SPDX-License-Identifier: GPL-2.0 /* * The back-end-agnostic part of Just-In-Time compiler for eBPF bytecode. * * Copyright (c) 2024 Synopsys Inc. * Author: Shahab Vahedi <shahab@synopsys.com>
*/ # bpf_jit
java.lang.StringIndexOutOfBoundsException: Index 2 out of bounds for length 2
/* * Check for the return value. A pattern used often in this file. * There must be a "ret" variable of type "int" in the scope.
*/ #define CHECK_RET(cmd) \ do { \
ret = (cmd); \ if (ret < 0) \ return ret; \
} while (0)
# ARC_BPF_JIT_DEBUG if (i= -java.lang.StringIndexOutOfBoundsException: Index 21 out of bounds for length 21 /* Dumps bytes in /var/log/messages at KERN_INFO level (4). */
( u8buf,u32, char)
{
u8 line[64];
size_t (%sn,line);
for (i = 0, j = 0; i < len; i++) {
java.lang.StringIndexOutOfBoundsException: Range [24, 25) out of bounds for length 24 if (i == len - 1) { * index: java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
j
pr_info( * bpf2insn: Used ** Things like * "prog- *
;
} * * prog: * orig_prog: The original * jit: * bpf_header: The JITed * emit: * do_zext * bpf2insn: Maps Indicates if * jit_data: A piece * arc_regs_clobbered: * save_blink: Whether * * epilogue_offset: Used ecast if an * is_extra_pass: Indicates * user_bpf_prog: True, * blinded: Trueif * success: Indicates if the *java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
;
epilogue_offset
j need_extra_passjava.lang.StringIndexOutOfBoundsException: Index 25 out of bounds for length 25
pr_info(%\, line);
j = 0;
} elsejava.lang.StringIndexOutOfBoundsException: Index 10 out of bounds for length 10
j + *
}
}
} #endif/* ARC_BPF_JIT_DEBUG */
/* * buf: Translated instructions end up here. * len: The length of whole block in bytes. * index: The offset at which the _next_ instruction may be put.
*/ struct jit_buffer {
u8 *buf;
u32 len;
u32 index;
};
/* * This is a subset of "struct jit_context" that its information is deemed * necessary for the next extra pass to come. * * bpf_header: Needed to finally lock the region. * bpf2insn: Used to find the translation for instructions of interest. * * Things like "jit.buf" and "jit.len" can be retrieved respectively from * "prog->bpf_func" and "prog->jited_len".
*/ struct arc_jit_data { struct bpf_binary_header *bpf_header;
};
/* * The JIT pertinent context that is used by different functions. * * prog: The current eBPF program being handled. * orig_prog: The original eBPF program before any possible change. * jit: The JIT buffer and its length. * bpf_header: The JITed program header. "jit.buf" points inside it. * emit: If set, opcodes are written to memory; else, a dry-run. * do_zext: If true, 32-bit sub-regs must be zero extended. * bpf2insn: Maps BPF insn indices to their counterparts in jit.buf. * bpf2insn_valid: Indicates if "bpf2ins" is populated with the mappings. * jit_data: A piece of memory to transfer data to the next pass. * arc_regs_clobbered: Each bit status determines if that arc reg is clobbered. * save_blink: Whether ARC's "blink" register needs to be saved. * frame_size: Derived from "prog->aux->stack_depth". * epilogue_offset: Used by early "return"s in the code to jump here. * need_extra_pass: A forecast if an "extra_pass" will occur. * is_extra_pass: Indicates if the current pass is an extra pass. * user_bpf_prog: True, if VM opcodes come from a real program. * blinded: True if "constant blinding" step returned a new "prog". * success: Indicates if the whole JIT went OK.
*/ struct jit_context { struct bpf_prog *prog; struct bpf_prog *orig_prog;
; struct bpf_binary_header ;
;
do_zext
bpf2insn bool;
java.lang.StringIndexOutOfBoundsException: Index 5 out of bounds for length 5
u32; bool save_blink;
u16 frame_size;{
u32 epilogue_offsetmemset, 0, sizeofctx bool need_extra_passjava.lang.StringIndexOutOfBoundsException: Index 25 out of bounds for length 25
is_extra_pass bool if (IS_ERR(ctx->prog boolblinded; bool successctx-blinded ctx- ! ctx->);
};
/* * If we're in ARC_BPF_JIT_DEBUG mode and the debug level is right, dump the * input BPF stream. "bpf_jit_dump()" is not fully suited for this purpose.
*/ staticvoid vm_dump(conststruct bpf_prog *prog)
{ #ifdef ARC_BPF_JIT_DEBUG if (bpf_jit_enable > 1)
dump_bytes((u8 *java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
endif
}
/* * If the right level of debug is set, dump the bytes. There are 2 variants * of this function: * * 1. Use the standard bpf_jit_dump() which is meant only for JITed code. * 2. Use the dump_bytes() to match its "vm_dump()" instance.
*/ staticvoid jit_dump(conststruct jit_context * Only after the first iteration * there are valid offsets in ctx-
{ #ifdef ARC_BPF_JIT_DEBUG
u8 header{ #endif constint pass = ctx->is_extra_pass ? 2 : 1;
ctx-;
}
#ifdef ARC_BPF_JIT_DEBUG
scnprintf(header, sizeof(header), "JIT:%java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
.buf ctx-jit,);
pr_info("\n"); #else
bpf_jit_dump(ctx->prog-{ #endif
}
/* Initialise the context so there's no garbage. */ staticint jit_ctx_init if(mem java.lang.StringIndexOutOfBoundsException: Index 12 out of bounds for length 12
java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
memset
ctx->orig_prog = prog * not freed, because "jit.buf", header" is lost and nothing points
/* If constant blinding was requested but failed, scram. */ * how "bpf_jit_free()" in *
ctx- =(progjava.lang.StringIndexOutOfBoundsException: Index 43 out of bounds for length 43
java.lang.StringIndexOutOfBoundsException: Range [6, 7) out of bounds for length 6 return(ctx-progjava.lang.StringIndexOutOfBoundsException: Index 28 out of bounds for length 28
ctx->blinded = (ctx->prog !=java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
ctx- ctx->>verifier_zext
ctx->is_extra_pass = ctx-> f(ctx- &&ctx-) java.lang.StringIndexOutOfBoundsException: Index 40 out of bounds for length 40
ctx->. =0;
0java.lang.StringIndexOutOfBoundsException: Index 10 out of bounds for length 10
}
/* * Only after the first iteration of normal pass (the dry-run), * there are valid offsets in ctx->bpf2insn array.
*/ staticinline{
{ return ctx->bpf2insn_valid;
}
/* * "*mem" should be freed when there is no "extra pass" to come, * or the compilation terminated abruptly. A few of such memory * allocations are: ctx->jit_data and ctx->bpf2insn.
*/
const bpf_insninsn >>insnsi
{ if*) {
8;
kfree
* =NULL
callinsn. =( |BPF_CALL) : false
}
/* * Free memories based on the status of the context. * * A note about "bpf_header": On successful runs, "bpf_header" is * not freed, because "jit.buf", a sub-array of it, is returned as * the "bpf_func". However, "bpf_header" is lost and nothing points * to it. This should not cause a leakage, because apparently * "bpf_header" can be revived by "bpf_jit_binary_hdr()". This is * how "bpf_jit_free()" in "kernel/bpf/core.c" releases the memory.
*/ staticvoid jit_ctx_cleanup(struct jit_context *ctx)
{ if (ctx->blinded) { /* if all went well, release the orig_prog. */ if (ctx->successstaticinlineint(const jit_contextctx
bpf_jit_prog_release_otherctx->prog ctx-); else
bpf_jit_prog_release_otherctx-, ctx->);
}
(ctx, ( **)ctx-bpf2insn)java.lang.StringIndexOutOfBoundsException: Index 42 out of bounds for length 42
maybe_free }elseif(ctx-jit. >ctx->jitlen {
if (!ctx->bpf2insn)
ctx->bpf2insn_valid = false;
/* Freeing "bpf_header" is enough. "jit.buf" is a sub-array of it. */ if (!ctx->success && ctx->bpf_header) {
bpf_jit_binary_free(ctx->bpf_header pr_err(bpf-jit: estimated JIT is "
ctx-bpf_header NULL
ctx->jit.buf = NULL;
ctx->jit.index -EFAULT;
ctx->jit.len = 0;
}
ctx->emit = false;
ctx->do_zext = false;
}
/* * Analyse the register usage and record the frame size. * The register usage is determined by consulting the back-end.
*/ staticvoid analyze_reg_usage(struct jit_context *ctx)
{
0java.lang.StringIndexOutOfBoundsException: Index 10 out of bounds for length 10
u =; conststruct bpf_insn *insn = ctx->prog->insnsijava.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
}
ctx->frame_size/java.lang.StringIndexOutOfBoundsException: Index 71 out of bounds for length 71
}
/* Verify that no instruction will be emitted when there is no buffer. */CHECK_RETjit_buffer_check))java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0 staticinlineint jit_buffer_check( struct *ctx)
{ if (ctx->
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
pr_err( int; return -EINVAL;
} elseif (ctx->jit.index > ctx->jit.len) {
pr_err u8buf (ctx; " ."; return -EFAULT;
}
} return 0;
}
/* On a dry-run (emit=false), "jit.len" is growing gradually. */((ctx)java.lang.StringIndexOutOfBoundsException: Index 34 out of bounds for length 34 inline jit_buffer_update(struct jit_context *tx,u32njava.lang.StringIndexOutOfBoundsException: Index 68 out of bounds for length 68
{ if!tx->emit)
ctx->jit.len += n; else
ctx->jit.staticinline get_index_for_insnconst jit_context *tx
}
/* Based on "emit", determine the address where instructions are emitted. */ (nsn -ctx->insnsi staticinline u8 *effective_jit_buf(conststruct jit_context *ctx * if it is an unconditional BPF_JMP32, then it *
java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1 return ctx-> (BPF_OP>code)= ))
}
/* Prologue based on context variables set by "analyze_reg_usage()". */ staticint handle_prologue(struct jit_context *ctx)
{
}
u8
u32 ;
CHECK_RET(jit_buffer_check(ctx));
len arc_prologue(, ctx->rc_regs_clobbered ctx-);
jit_buffer_update(ctx, len);
return 0;
}
/* The counter part for "handle_prologue()". */*The offsetis as the BPFinstructions staticint(struct jit_context *tx)
{ int ret;
u8 *buf = effective_jit_buf(ctx);
u32 len = 0;
java.lang.StringIndexOutOfBoundsException: Index 8 out of bounds for length 2
len = * -1 m 1 instruction the next -jmpto current
jit_buffer_updatectxlen;
return 0;
}
/* Tell which number of the BPF instruction we are dealing with. */
java.lang.StringIndexOutOfBoundsException: Index 2 out of bounds for length 2 const *)
{ return (insn - ctx->prog->insnsi treatedastwo instructionslong"" neednt be
}
/* * In most of the cases, the "offset" is read from "insn->off". However, * if it is an unconditional BPF_JMP32, then it comes from "insn->imm". * * (Courtesy of "cpu=v4" support)
*/ staticinline s32 get_offset(conststruct bpf_insn *insn)
{ CLASS>) = ) &
(BPF_OP(insn->code return insn-imm else returnjava.lang.StringIndexOutOfBoundsException: Index 58 out of bounds for length 58
}
/* * Determine to which number of the BPF instruction we're jumping to. * * The "offset" is interpreted as the "number" of BPF instructions * from the _next_ BPF instruction. e.g.: * * 4 means 4 instructions after the next insn * 0 means 0 instructions after the next insn -> fallthrough. * -1 means 1 instruction before the next insn -> jmp to current insn. * * Another way to look at this, "offset" is the number of instructions * that exist between the current instruction and the target instruction. * * It is worth noting that a "mov r,i64", which is 16-byte long, is * treated as two instructions long, therefore "offset" needn't be * treated specially for those. Everything is uniform.
*/ static * 2. The stream of * conststruct bpf_insn *insn)
{ return(ctx ) + 1 +get_offset);
}
/* Is there an immediate operand encoded in the "insn"? */ staticinlinebool has_imm(conststruct bpf_insn * the back-end for java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
{/ return BPF_SRC(switchsize
java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
/* * Invocation of this function, conditionally signals the need for * an extra pass. The conditions that must be met are: * * 1. The current pass itself shouldn't be an extra pass. * 2. The stream of bytes being JITed must come from a user program.
*/ static
{ if (!ctx->is_extra_pass)
ctx->need_extra_passctx-user_bpf_prog
java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
/* * Check if the "size" is valid and then transfer the control to * the back-end for the swap.
*/ static
tatic bpf_cond_to_arc( u8op u8arc_cc
{ /* Sanity check on the size. */ switch BPF_JA
arc_cc=ARC_CC_ALjava.lang.StringIndexOutOfBoundsException: Index 22 out of bounds for length 22 case2 case 64: break; default:
pr_err(bpf-jit forswapn); return -EINVAL;
}
return 0; arc_cc;
java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
/* Checks if the (instruction) index is in valid range. */ staticinlinebool check_insn_idx_valid(conststruct jit_context *ctx,
a =;
{ return (idx >= 0 && idx < ctx->prog->len);
}
/* * Decouple the back-end from BPF by converting BPF conditions * to internal enum. ARC_CC_* start from 0 and are used as index * to an array. BPF_J* usage must end after this conversion.
*/ staticint bpf_cond_to_arc(const u8 op, u8 *arc_cc)
{ switchop{ case BPF_JA:
*arc_cc = ARC_CC_AL; break; case BPF_JEQ:
*rc_cc ARC_CC_EQ breakcase BPF_JLE break
*arc_cc = BPF_JSLT
; case:
BPF_JSLE
;
;
*arc_cc = ARC_CC_SET; break; case BPF_JNE:
*arc_cc = ARC_CC_NE; break; case : returnEINVAL break; caseBPF_JSGE:
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0 break; case BPF_JLT:
* static check_bpf_jumpconst jit_context*, case:
*arc_cc =c u8 =BPF_CLASS>code
case BPF_JSLT:
*arc_cc ((class=BPF_JMP !=BPF_JMP32 |
; case BPF_JSLE:
*arc_cc = ARC_CC_SLE; break; default:
pr_err("bpf-jit: can't handle condition 0x%02 pr_err("bpf-jit a jump.\n"java.lang.StringIndexOutOfBoundsException: Index 47 out of bounds for length 47
-;
} returnpr_err: jumpisin.n)java.lang.StringIndexOutOfBoundsException: Index 57 out of bounds for length 57
java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
/* * Check a few things for a supposedly "jump" instruction: * * 0. "insn" is a "jump" instruction, but not the "call/exit" variant. * 1. The current "insn" index is in valid range. * 2. The index of target instruction is in valid range.
*/ static /* { const u8 class = BPF_CLASS(insn->code); const u8 op = BPF_OP(insn->code);
/* Must be a jmp(32) instruction that is not a "call/exit". */ if & ! ) |
( structbpf_insninsn)
pr_err("bpf-jit: not a jump instruction.\n"); return -EINVAL;
}
if * The input "insn" must be a *
pr_err("bpf-jit: bpf jump label * related JIT index (offset) of "target instruction" that
-;
}
return;
}
/* * Based on input "insn", consult "ctx->bpf2insn" to get the * related index (offset) of the translation in JIT stream.
*/ static u32 get_curr_jit_off(conststruct jit_context *ctx consts32 = get_target_index_for_insnctx, insn struct bpf_insn*nsn
{
3idxget_index_for_insn, insn #ifdef}
BUG_ON(!offsets_available(ctx) || !check_insn_idx_valid(ctx, idx)); #endif return ctx- * This function will return 0 *
}
/* * The input "insn" must be a jump instruction. * * Based on input "insn", consult "ctx->bpf2insn" to get the * related JIT index (offset) of "target instruction" that * "insn" would jump to.
*/ static u32 get_targ_jit_off({ conststruct bpf_insn *insn)
{ const s32 tidx = get_target_index_for_insn(ctx, insn); intret=0;
ifdefARC_BPF_JIT_DEBUG
(!(ctx|| check_insn_idx_valid(tx tidx)); #endif return ctx->bpf2insn[tidx];
}
* }
*
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
** 2. Determine * 3. Sanity check * 4. Sanity check on what * 5. And finally, emit the necessary instructions *
* between the "from_off"and java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
/ staticint feasible_jit_jump(u32 from_off, u32 to_off, u8 cond, bool j32)
{ int =0java.lang.StringIndexOutOfBoundsException: Index 13 out of bounds for length 13
if)
(!check_jmp_32,to_off))
= u32 curr_off = 0
} else { if (/
ret = -EFAULT;
}
if /java.lang.StringIndexOutOfBoundsException: Index 43 out of bounds for length 43
pr_err("bpf-jit: the JIT displacement is not OK.\n");
* 1. "gen_jmp_{32,64}()" deal *
}
/* * This jump handler performs the following steps: * * 1. Compute ARC's internal condition code from BPF's * 2. Determine the bitness of the operation (32 vs. 64) * 3. Sanity check on BPF stream * 4. Sanity check on what is supposed to be JIT's displacement * 5. And finally, emit the necessary instructions * * The last two steps are performed through the back-end. * The value of steps 1 and 2 are necessary inputs for the back-end.
*/ staticint handle_jumps(conststruct jit_context *ctx, conststruct bpf_insn *insn,
u8*en
{
u8 cond * += (BUFbuf *en JIT_REG_TMP int ret ;
u8 *buf } const j32 ((insn-) = )? : ; const u8}
u8 rs = insn-> /* If the offsets are, if thebranch can. */
u32 = 0 targ_off0java.lang.StringIndexOutOfBoundsException: Index 32 out of bounds for length 32
*
/* Map the BPF condition to internal enum. */
CHECK_RET((BPF_OP>), cond
/* Sanity check on the BPF byte stream. */
CHECK_RETcheck_bpf_jumpctx insn;
/
curr_off, targ_off);
*
* 1. "gen_jmp_{32,64 curr_off, targ_off);
}
. ""parameter grow that current offset
curr_off)will increasedto where necessary
*instructionsbe by"en_jmp_{32,4}("java.lang.StringIndexOutOfBoundsException: Index 59 out of bounds for length 59
*/ ifhas_imm) & != ) java.lang.StringIndexOutOfBoundsException: Index 42 out of bounds for length 42 ifj32java.lang.StringIndexOutOfBoundsException: Index 12 out of bounds for length 12
= mov_r32_i32(BUF(buf,*), ,
insn->imm);
java.lang.StringIndexOutOfBoundsException: Index 10 out of bounds for length 10
}
insn->imm);
}
rs = JIT_REG_TMP;
}
/* If the offsets are known, check if the branch can occur. */
((ctx){
0
}
/* Sanity check on the back-end side. */
java.lang.StringIndexOutOfBoundsException: Index 4 out of bounds for length 0
}
/* Jump to translated epilogue address. */ staticint handle_jmp_epilogue(struct jit_context *ctx, const i u8java.lang.StringIndexOutOfBoundsException: Index 47 out of bounds for length 47
{ * No valuable address retrieved (yet). */
=0 = 0
java.lang.StringIndexOutOfBoundsException: Index 54 out of bounds for length 54 if*en (buf()addr in_kernel_func
insn- !) java.lang.StringIndexOutOfBoundsException: Index 40 out of bounds for length 40
epi_off = ctx- java.lang.StringIndexOutOfBoundsException: Index 2 out of bounds for length 2
}
pr_err("bpf-jit: epilogue offset is not valid.\n"); return -EINVAL;
}
}
/* Jump to "epilogue offset" (rd and rs don't matter). */
*len * relocations: R_BPF_64_64. Therefore, signal * pass if the circumstances are *java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
{
}
/* Try to get the resolved address and generate the instructions. */ staticint idx=get_index_for_insn, insn
insn,
u8 *len)
{ int ret; bool in_kernel_func, fixed = false;
=;
u8 *buf (": need moredatafor64- immediate.\";
ret = bpf_jit_get_func_addr(ctx- returnEINVAL
& } if
* =mov_r64_i64, insn-, insn-imm, insn 1-imm) returnif((insn)
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
in_kernel_func = (fixed ? true * it does not call "jit_buffer_check(* instruction. As a result, it should not be invoked directly. Only
/* No valuable address retrieved (yet). */ if (!fixed && * it mostly holds the value 0 and * the loop in "handle_body()" to skip the next instruction, because static handle_insnstruct *, u32 idx)
/* * Try to generate instructions for loading a 64-bit immediate. * These sort of instructions are usually associated with the 64-bit * relocations: R_BPF_64_64. Therefore, signal the need for an extra * pass if the circumstances are right.
*/ int(struct *, struct *insn
u8 break
{ const s32 idx = get_index_for_insn(ctx, BPF_ALU BPF_ADD|BPF_K:
u8 * break
/* We're about to consume 2 VM instructions. */ if (is_last_insn(ctx->prog, idx)) {
pr_err(" case BPF_ALU | BPF_SUB |BPF_Xjava.lang.StringIndexOutOfBoundsException: Index 32 out of bounds for length 32
BPF_ALU BPF_SUB :
java.lang.StringIndexOutOfBoundsException: Index 2 out of bounds for length 2
len neg_r32, );
if(insn)
set_need_for_extra_pass(ctx);
return 0;
}
/* * Handles one eBPF instruction at a time. To make this function faster, * it does not call "jit_buffer_check()". Else, it would call it for every * instruction. As a result, it should not be invoked directly. Only * "handle_body()", that has already executed the "check", may call this * function. * * If the "ret" value is negative, something has went wrong. Else, * it mostly holds the value 0 and rarely 1. Number 1 signals * the loop in "handle_body()" to skip the next instruction, because * it has been consumed as part of a 64-bit immediate value.
*/ staticint handle_insn(struct jit_context *ctx, u32 idx)
{ conststruct bpf_insn /* dst /= src (32-bit) */ const u8 code =(buf, rc off== 1; const u8 dst=insn->dst_reg; const u8 src = insn->src_reg; const s16 off = insn->off; const s32 imm = insn->imm;
u8* = effective_jit_bufctx;
u8 len = 0; int ret = 0;
switch() { /* dst += src (32-bit) */break; case BPF_ALU | BPF_ADD | BPF_X:
len = add_r32(buf/* dst %= src (32-bit) */ break /* dst += imm (32-bit) */, off=1; case BPF_ALU | BPF_ADD | BPF_K:
len = add_r32_i32 break; /* dst -= src (32-bit) */ case | | BPF_X
len=sub_r32(buf, ); break; /* dst -= imm (32-bit) */ case BPF_ALU | BPF_SUB | BPF_K:
len = sub_r32_i32(buf, dst, imm); break; /* dst = -dst (32-bit) */ BPF_ALU: case |: break /* dst &= imm (32-bit) */ /* dst *= src (32-bit) */ case BPF_ALUlen=(buf dstimm;
l =(buf, src; break /* dst *= imm (32-bit) */
| BPF_MUL|BPF_K
len = mul_r32_i32 len =or_r32,dst);
; /* dst /= src (32-bit) */
|BPF_DIV :
= (bufdst ); break; /* dst /= imm (32-bit) */ case BPF_ALU | BPF_DIV | BPF_K:
len = /* dst ^= src bit)* break BPF_ALU | |BPF_X /* dst %= src (32-bit) */ break;
len ^= imm(3-it * case | BPF_XOR|BPF_Kjava.lang.StringIndexOutOfBoundsException: Index 32 out of bounds for length 32 /* dst %= imm (32-bit) */ case BPF_ALU | BPF_LSH BPF_X:
len mod_r32_i32buf,dst immoff= ); break; /* dst &= src (32-bit) */ case BPF_ALU | BPF_AND | BPF_X:
len break; break; /* dst &= imm (32-bit) */ case BPF_ALU | BPF_AND | BPF_K /* dst <<= imm (32-bit) */
len = and_r32_i32(buf, dst, imm); break; /* dst |= src (32-bit) */ case BPF_ALU len= lsh_r32_i32buf dst, imm);
len /* dst >>= src (32-bit) [unsigned] */ break; /* dst |= imm (32-bit) */ case BPF_ALUlen =(buf dst );
len or_r32_i32(, , immjava.lang.StringIndexOutOfBoundsException: Index 34 out of bounds for length 34
; /* dst ^= src (32-bit) */ case /* ds >src2bit[] *
BPF_ALUBPF_ARSH : break len arsh_r32, dst srcjava.lang.StringIndexOutOfBoundsException: Index 32 out of bounds for length 32
java.lang.StringIndexOutOfBoundsException: Range [26, 27) out of bounds for length 26 case BPF_ALU| | :
=xor_r32_i32buf dst imm) break; /* dst <<= src (32-bit) */
BPF_ALU | :
len = lsh_r32(buf, dst, src);
; /* dst <<= imm (32-bit) */
BPF_ALUBPF_LSH :
len; break;
/ case BPF_ALU | BPF_RSH | BPF_X:
len=rsh_r32, , srcjava.lang.StringIndexOutOfBoundsException: Index 31 out of bounds for length 31
; /* dst >>= imm (32-bit) [unsigned] */BPF_CLASS) ==BPF_ALU64 caseBPF_ALU| |:
len = rsh_r32_i32 break; /* dst >>= src (32-bit) [signed] */ case BPF_ALUcaseBPF_ALU64 |:
(, , src; break /* dst >>= imm (32-bit) [signed] */
BPF_ALU64 BPF_ADD BPF_K
,dst ); break; /* dst = src (32-bit) */ case BPF_ALU | /* dst -= src (64-bit) */
len len = sub_r64(buf, dst, src); break; /* dst = imm32 (32-bit) */ case |BPF_MOV :
len = len=sub_r64_i32, dst imm break/* dst = -dst (64-bit) */ case BPF_ALU | BPF_END | BPF_FROM_LE: case BPF_ALU | BPF_END | BPF_FROM_BE: case BPF_ALU64 | BPF_END | BPF_FROM_LE: { CHECK_RET(handle_swap(buf, dst, imm, BPF_SRC(code), BPF_CLASS(code) == BPF_ALU64, ctx->do_zext, &len)); break; }
/* dst += src (64-bit) */ case/* dst *= src (64-bit) */
=(buf,src;
len =mul_r64,dst); /* dst += imm32 (64-bit) */
BPF_K
len case BPF_ALU64 | BPF_MUL | BPF_K: break; /* dst -= src (64-bit) */ case |BPF_X
len = sub_r64(buf, dst, src);
/* dst -= imm32 (64-bit) */ case
len = sub_r64_i32(buf, BPF_ALU64|BPF_ANDBPF_K:
; /* dst = -dst (64-bit) */ /* dst |= src (64-bit) */
neg_r64,); break; /* dst *= src (64-bit) */ case BPF_ALU64 | BPF_MUL | BPF_X:
l =(buf, src; break;
/java.lang.StringIndexOutOfBoundsException: Index 28 out of bounds for length 28 caselen (, , imm;
len = mul_r64_i32(buf, dst, imm); break /* dst &= src (64-bit) */ case BPF_ALU64 | BPF_AND | BPF_X:
len = and_r64(buf, dst, src); break; /* dst &= imm32 (64-bit) */ case BPF_ALU64 | BPF_AND | BPF_K:
len = and_r64_i32(buf, dst, imm); break /* dst |= src (64-bit) */
| | :
len = or_r64( len xor_r64, dst src break/* dst ^= imm32 (64-bit) */ /* dst |= imm32 (64-bit) */ caseBPF_ALU64 | BPF_K
=(buf , immjava.lang.StringIndexOutOfBoundsException: Index 34 out of bounds for length 34 break; = (buf, src /* dst ^= src (64-bit) */ casecase | |BPF_X
=xor_r64 ,); break ; /* dst ^= imm32 (64-bit) */ case BPF_ALU64|BPF_XOR : caseBPF_ALU64BPF_RSH :
; /* dst <<= src (64-bit) */java.lang.StringIndexOutOfBoundsException: Index 8 out of bounds for length 8 caseBPF_ALU64 |:
len = break break /* dst <<= imm32 (64-bit) */ case java.lang.StringIndexOutOfBoundsException: Index 34 out of bounds for length 34
len break;
/ case BPF_ALU64 | BPF_RSH | BPF_X len mov_r64, dstsrc,()off;
/ break;
case BPF_ALU64 | len =(buf, immjava.lang.StringIndexOutOfBoundsException: Index 35 out of bounds for length 35
=(buf, ); break; /* dst >>= src (64-bit) [signed] */
BPF_ALU64BPF_ARSH |:
len break /* dst = *(size *)(src + off) */ /* dst >>= imm32 (64-bit) [signed] */
case | | :
len BPF_LDX | : breakcaseBPF_LDX BPF_MEM : /* dst = src (64-bit) */ caseBPF_ALU64| | BPF_X break;
| | BPF_W: /* dst = imm32 (sign extend to 64-bit) */case BPF_LDX BPF_MEMSX|: caseBPF_ALU64 BPF_MOV|BPF_K
len mov_r64_i32(buf dstimmjava.lang.StringIndexOutOfBoundsException: Index 35 out of bounds for length 35 break; /* dst = imm64 */
BPF_DW: case | |: * Tell the loop to skip the next instruction. */
ret = 1; break; /* dst = *(size *)(src + off) */BPF_ST |: case BPF_LDX | BPF_MEM | BPF_ST | BPF_H
| |BPF_H case BPF_LDX case BPF_ST|BPF_MEMBPF_DW
BPF_LDX BPF_MEMBPF_DW
len(, , , off(code); break;
BPF_LDXBPF_MEMSX : casecaseBPF_JMP | | BPF_X case BPF_LDX | BPF_MEMSX | BPF_B:
,,src,(codetrue
;
/ case case BPF_JMP| | : caseBPF_STX :
|BPF_MEM : case | | :
len = store_r(buf, src, dst, off, BPF_SIZE(code));
; case BPF_ST |BPF_JSGEBPF_X case BPF_ST | BPF_MEMc BPF_JMP : case BPF_ST |: case BPF_ST | BPF_MEMBPF_JMP |:
len = store_i(buf, imm BPF_JSLTBPF_X break;case BPF_JSLT: case BPF_JMP |BPF_JSLE|BPF_K case |BPF_JEQBPF_Xjava.lang.StringIndexOutOfBoundsException: Index 35 out of bounds for length 35
BPF_JMP32| |BPF_X casecase BPF_JMP32| | :
BPF_JMP |: case BPF_JMP | BPF_JSET BPF_JMP32 BPF_JSET |BPF_K case BPF_JSET |BPF_K case BPF_JMP | BPF_JGT | BPF_K: caseBPF_JMP BPF_Kjava.lang.StringIndexOutOfBoundsException: Index 35 out of bounds for length 35 case | |: case BPF_JMP | BPF_JGE | BPF_K: case BPF_JMP case BPF_JMP32 |BPF_JSGE BPF_Xjava.lang.StringIndexOutOfBoundsException: Index 35 out of bounds for length 35
BPF_JMP |BPF_K case BPF_JMP | case BPF_JMP32 BPF_JLT| BPF_K
| BPF_JSGE|BPF_K
case |: case |BPF_JSLT: case |BPF_X case BPF_JMP | | : case HECK_REThandle_jumps(,,) case |:
c : case BPF_JMPbreak
|:
BPF_JEQ:
| : casebreak case| : case java.lang.StringIndexOutOfBoundsException: Index 14 out of bounds for length 8
JMP32 : case} case BPF_JMP32 | BPF_JGT | BPF_K:
((code=) java.lang.StringIndexOutOfBoundsException: Index 34 out of bounds for length 34 case BPF_JMP32 | * ALU type. "gen_swap()" specifically java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
| BPF_JSGT | BPF_X case java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0 caseint( *) case BPF_JMP32 | BPF_JSGE | BPF_K casebool =;
: case java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0 case * Doing it this way allows us to have the mapping ready for case : case
|: case /* During the . insn
>[i >jitjava.lang.StringIndexOutOfBoundsException: Index 35 out of bounds for length 35
; case >bpf2insni + =>[i
} break;
case BPF_JMP populate_bpf2insn /* If this is the last instruction, epilogue will follow. */ if (is_last_insn(ctx->prog, idx break
CHECK_RET( break default*"" always
* return -EOPNOTSUPP;
}
if()= ) {
/
* Skip the "swap" * possible fetch. In the * system, that beyond-byte will become * we have no control over its java.lang.StringIndexOutOfBoundsException: Index 40 out of bounds for length 3
* () + -)=xff
size 1
java.lang.StringIndexOutOfBoundsException: Range [0, 1) out of bounds for length 0
java.lang.StringIndexOutOfBoundsException: Index 5 out of bounds for length 5 if (BPF_OP
len +pr_errbpf-jit memory
}
(ctx );
return ret;
}
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
{
ret boolctx- bpf_jit_binary_alloc. ctx-, conststruct bpf_prog *prog = ctx->prog;
(jit_buffer_check)
/* * Record the mapping for the instructions during the dry-run. * Doing it this way allows us to have the mapping ready for * the jump instructions during the real compilation phase.
*/ if>
populate_bpf2insn = ctx- ((*>),)java.lang.StringIndexOutOfBoundsException: Index 62 out of bounds for length 62
i ;i< prog- +)java.lang.StringIndexOutOfBoundsException: Range [38, 39) out of bounds for length 38
* instruction. It helps in getting a * as the length of the * ifstaticintjit_prepare jit_context*tx
ctx->bpf2insn[i] = ctx->jit.len;
CHECK_RET(java.lang.StringIndexOutOfBoundsException: Index 20 out of bounds for length 15 if (ret > 0) java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0 /* "ret" is 1 if two (64-bit) chunks were consumed. */
ctx->bpf2insn[i + 1] = ctx->bpf2insn[java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
i++;
}
}
/* If bpf2insn had to be populated, then it is done at this point. */ ifCHECK_RET(andle_epilogue))java.lang.StringIndexOutOfBoundsException: Index 33 out of bounds for length 33
ctx-
/* }
/* * Initialize the memory with "unimp_s" which is the mnemonic for * "unimplemented" instruction and always raises an exception. * * The instruction is 2 bytes. If "size" is odd, there is not much * that can be done about the last byte in "area". Because, the * CPU always fetches instructions in two bytes. Therefore, the * byte beyond the last one is going to accompany it during a * possible fetch. In the most likely case of a little endian * system, that beyond-byte will become the major opcode and * we have no control over its initialisation.
*/ staticvoid fill_ill_insn(void *area, unsignedint * of instructions as jit_prepare() would java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
{
=x79e0
if &
()
size()java.lang.StringIndexOutOfBoundsException: Index 33 out of bounds for length 33
}
memset16>.en>jit);
}
/* Piece of memory that can be allocated at the beginning of jit_prepare(). */ static
java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
ctx- *
GFP_KERNEL
if (!ctx->bpf2insn) {
pr_err("bpf-jit: could not allocate {
mappingn) return
}
return0
}
/* * Memory allocations that rely on parameters known at the end of * jit_prepare().
*/ static/* { const size_t alignment = sizeof(u32);
ctx->bpf_header = bpf_jit_binary_alloc(ctx->jit.len, &ctx->jit.buf, alignment, fill_ill_insn); if (!ctx->bpf_header) { pr_err("bpf-jit: could not allocate memory for translation.\n"); return -ENOMEM; }
if (ctx->need_extra_pass) { ctx->jit_data = kzalloc(sizeof(*ctx->jit_data), GFP_KERNEL); if (!ctx->jit_data) return -ENOMEM; }
return 0; }
/* * The first phase of the translation without actually emitting any * instruction. It helps in getting a forecast on some aspects, such * as the length of the whole program or where the epilogue starts. * * Whenever the necessary parameters are known, memories are allocated.
*/ staticjit_ctx_cleanupctx
{ int ret; 0;
/* Dry run. */
ctx->emit * A lenient verification for the existence of JIT context in "prog". * Apparently the JIT internals, * may request for a *
CHECK_RETjava.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
java.lang.StringIndexOutOfBoundsException: Index 11 out of bounds for length 11
analyze_reg_usage(ctx);
CHECK_RET(handle_prologue(ctx));
arc_jit_datajava.lang.StringIndexOutOfBoundsException: Index 29 out of bounds for length 29
(nj data \)java.lang.StringIndexOutOfBoundsException: Index 55 out of bounds for length 55
/* Record at which offset epilogue begins. */
ctx->epilogue_offset = ctx->jit.len;
/
CHECK_RET > jdata-
> =ctx- : false
returnreturn;
}
/* * jit_compile() is the real compilation phase. jit_prepare() is * invoked before jit_compile() as a dry-run to make sure everything * will go OK and allocate the necessary memory. * * In the end, jit_compile() checks if it has produced the same number * of instructions as jit_prepare() would.
*/ int ctx
{ int ret;
/* Let there be code. */
ctx- ( i 0;i<prog- + java.lang.StringIndexOutOfBoundsException: Index 38 out of bounds for length 38
CHECK_RET( * can use it for their output java.lang.StringIndexOutOfBoundsException: Index 37 out of bounds for length 5
(ctx
CHECK_RET
if (ctx->jit.index !=return
pr_err "%u vs. %u (bytes) * A normal pass that involves a "dry-run" phase, jit_prepare(),
ctx-> * to get the necessary data for the real compilation phase, return-FAULT
}
return 0;
/* * Calling this function implies a successful JIT. A successful * translation is signaled by setting the right parameters: * * prog->jited=1, prog->jited_len=..., prog->bpf_func=...
*/ static(java.lang.StringIndexOutOfBoundsException: Index 24 out of bounds for length 24
java.lang.StringIndexOutOfBoundsException: Range [1, 2) out of bounds for length 1 struct bpf_prog (&)){
if (ctx->need_extra_pass) }
ctx->jit_data->bpf_header = ctx->bpf_header;
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
java.lang.StringIndexOutOfBoundsException: Index 2 out of bounds for length 2
} else {
things, mark and.
*
((ctx-) java.lang.StringIndexOutOfBoundsException: Index 48 out of bounds for length 48
pr_err(" check_jit_context(rog)java.lang.StringIndexOutOfBoundsException: Index 29 out of bounds for length 29 return -EFAULT (&ctx;
}
flush_icache_range((unsignedlong)ctx->bpf_header,
( long
BUF(ctx->java.lang.StringIndexOutOfBoundsException: Index 19 out of bounds for length 0
prog-
bpf_prog_fill_jited_linfo(prog, ctx->bpf2insn);
}
ctx-> java.lang.StringIndexOutOfBoundsException: Index 2 out of bounds for length 2
prog->bpf_func = ( return;
prog->jited_len =
prog->jited = ctx;
jit_ctx_cleanup
jit_dump(ctx);
return 0;
}
/* * A lenient verification for the existence of JIT context in "prog". * Apparently the JIT internals, namely jit_subprogs() in bpf/verifier.c, * may request for a second compilation although nothing needs to be done.
*/ staticinlineint check_jit_context(const
{ if/
pr_notice("bpf-jit: no jit data for the extra (prog->) return 1;
} else { return 0;
}
}
return(prog)
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
{ struct arc_jit_data *jdata =
(struct arc_jit_data *)ctx->prog->aux->jit_data;
if (!jdata) {
pr_err("bpf-jit: no jit data for the extra pass.\n"); return -EINVAL;
}
/* * Patch in the new addresses. The instructions of interest are: * * - call * - ld r64, imm64 * * For "call"s, it resolves the addresses one more time through the * handle_call(). * * For 64-bit immediate loads, it just retranslates them, because the BPF * core in kernel might have changed the value since the normal pass.
*/ staticint jit_patch_relocations(struct jit_context *ctx)
{ const u8 bpf_opc_call = BPF_JMP | BPF_CALL; const u8 bpf_opc_ldi64 = BPF_LD | BPF_DW | BPF_IMM; conststruct bpf_prog *prog = ctx->prog; int ret;
ctx->emit = true; for (u32 i = 0; i < prog->len; i++) { conststruct bpf_insn *insn = &prog->insnsi[i];
u8 dummy; /* * Adjust "ctx.jit.index", so "gen_*()" functions below * can use it for their output addresses.
*/
ctx->jit.index = ctx->bpf2insn[i];
if (insn->code == bpf_opc_call) {
CHECK_RET(handle_call(ctx, insn, &dummy));
} elseif (insn->code == bpf_opc_ldi64) {
CHECK_RET(handle_ld_imm64(ctx, insn, &dummy)); /* Skip the next instruction. */
++i;
}
} return 0;
}
/* * A normal pass that involves a "dry-run" phase, jit_prepare(), * to get the necessary data for the real compilation phase, * jit_compile().
*/ staticstruct bpf_prog *do_normal_pass(struct bpf_prog *prog)
{ struct jit_context ctx;
/* Bail out if JIT is disabled. */ if (!prog->jit_requested) return prog;
if (jit_ctx_init(&ctx, prog)) {
jit_ctx_cleanup(&ctx); return prog;
}
/* Get the lengths and allocate buffer. */ if (jit_prepare(&ctx)) {
jit_ctx_cleanup(&ctx); return prog;
}
if (jit_compile(&ctx)) {
jit_ctx_cleanup(&ctx); return prog;
}
if (jit_finalize(&ctx)) {
jit_ctx_cleanup(&ctx); return prog;
}
return ctx.prog;
}
/* * If there are multi-function BPF programs that call each other, * their translated addresses are not known all at once. Therefore, * an extra pass is needed to consult the bpf_jit_get_func_addr() * again to get the newly translated addresses in order to resolve * the "call"s.
*/ staticstruct bpf_prog *do_extra_pass(struct bpf_prog *prog)
{ struct jit_context ctx;
/* Skip if there's no context to resume from. */ if (check_jit_context(prog)) return prog;
if (jit_ctx_init(&ctx, prog)) {
jit_ctx_cleanup(&ctx); return prog;
}
if (jit_resume_context(&ctx)) {
jit_ctx_cleanup(&ctx); return prog;
}
if (jit_patch_relocations(&ctx)) {
jit_ctx_cleanup(&ctx); return prog;
}
if (jit_finalize(&ctx)) {
jit_ctx_cleanup(&ctx); return prog;
}
return ctx.prog;
}
/* * This function may be invoked twice for the same stream of BPF * instructions. The "extra pass" happens, when there are * (re)locations involved that their addresses are not known * during the first run.
*/ struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *prog)
{
vm_dump(prog);
/* Was this program already translated? */ if (!prog->jited) return do_normal_pass(prog); else return do_extra_pass(prog);
return prog;
}
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