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Message-ID: <202110200954.JZyHmta7-lkp@intel.com>
Date: Wed, 20 Oct 2021 09:42:57 +0800
From: kernel test robot <lkp@...el.com>
To: Peter Zijlstra <peterz@...radead.org>
Cc: llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
linux-kernel@...r.kernel.org
Subject: [peterz-queue:objtool/core 42/43]
arch/x86/net/bpf_jit_comp32.c:1367:20: error: use of undeclared identifier
'__x86_indirect_thunk_edx'
tree: https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git objtool/core
head: 3fabba3d8d2d50b06b3d699f4b9f86a7de0aae4a
commit: 82ad1ab5ed7967a58506353f98d28e91b16d782c [42/43] bpf,x86: Respect X86_FEATURE_RETPOLINE*
config: i386-randconfig-a003-20211019 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project b37efed957ed0a0193d80020aefd55cb587dfc1f)
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git/commit/?id=82ad1ab5ed7967a58506353f98d28e91b16d782c
git remote add peterz-queue https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git
git fetch --no-tags peterz-queue objtool/core
git checkout 82ad1ab5ed7967a58506353f98d28e91b16d782c
# save the attached .config to linux build tree
mkdir build_dir
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=i386 SHELL=/bin/bash
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>
All errors (new ones prefixed by >>):
arch/x86/net/bpf_jit_comp32.c:209:6: warning: variable 'cnt' set but not used [-Wunused-but-set-variable]
int cnt = 0;
^
arch/x86/net/bpf_jit_comp32.c:237:6: warning: variable 'cnt' set but not used [-Wunused-but-set-variable]
int cnt = 0;
^
arch/x86/net/bpf_jit_comp32.c:288:6: warning: variable 'cnt' set but not used [-Wunused-but-set-variable]
int cnt = 0;
^
arch/x86/net/bpf_jit_comp32.c:321:6: warning: variable 'cnt' set but not used [-Wunused-but-set-variable]
int cnt = 0;
^
arch/x86/net/bpf_jit_comp32.c:369:6: warning: variable 'cnt' set but not used [-Wunused-but-set-variable]
int cnt = 0;
^
arch/x86/net/bpf_jit_comp32.c:438:6: warning: variable 'cnt' set but not used [-Wunused-but-set-variable]
int cnt = 0;
^
arch/x86/net/bpf_jit_comp32.c:485:6: warning: variable 'cnt' set but not used [-Wunused-but-set-variable]
int cnt = 0;
^
arch/x86/net/bpf_jit_comp32.c:527:6: warning: variable 'cnt' set but not used [-Wunused-but-set-variable]
int cnt = 0;
^
arch/x86/net/bpf_jit_comp32.c:601:6: warning: variable 'cnt' set but not used [-Wunused-but-set-variable]
int cnt = 0;
^
arch/x86/net/bpf_jit_comp32.c:700:6: warning: variable 'cnt' set but not used [-Wunused-but-set-variable]
int cnt = 0;
^
arch/x86/net/bpf_jit_comp32.c:734:6: warning: variable 'cnt' set but not used [-Wunused-but-set-variable]
int cnt = 0;
^
arch/x86/net/bpf_jit_comp32.c:787:6: warning: variable 'cnt' set but not used [-Wunused-but-set-variable]
int cnt = 0;
^
arch/x86/net/bpf_jit_comp32.c:840:6: warning: variable 'cnt' set but not used [-Wunused-but-set-variable]
int cnt = 0;
^
arch/x86/net/bpf_jit_comp32.c:893:6: warning: variable 'cnt' set but not used [-Wunused-but-set-variable]
int cnt = 0;
^
arch/x86/net/bpf_jit_comp32.c:941:6: warning: variable 'cnt' set but not used [-Wunused-but-set-variable]
int cnt = 0;
^
arch/x86/net/bpf_jit_comp32.c:990:6: warning: variable 'cnt' set but not used [-Wunused-but-set-variable]
int cnt = 0;
^
arch/x86/net/bpf_jit_comp32.c:1038:6: warning: variable 'cnt' set but not used [-Wunused-but-set-variable]
int cnt = 0;
^
arch/x86/net/bpf_jit_comp32.c:1115:6: warning: variable 'cnt' set but not used [-Wunused-but-set-variable]
int cnt = 0;
^
arch/x86/net/bpf_jit_comp32.c:1248:6: warning: variable 'cnt' set but not used [-Wunused-but-set-variable]
int cnt = 0;
^
>> arch/x86/net/bpf_jit_comp32.c:1367:20: error: use of undeclared identifier '__x86_indirect_thunk_edx'
EMIT1_off32(0xE9, __x86_indirect_thunk_edx - (ip + 5));
^
arch/x86/net/bpf_jit_comp32.c:1383:6: warning: variable 'cnt' set but not used [-Wunused-but-set-variable]
int cnt = 0;
^
arch/x86/net/bpf_jit_comp32.c:1401:6: warning: variable 'cnt' set but not used [-Wunused-but-set-variable]
int cnt = 0;
^
arch/x86/net/bpf_jit_comp32.c:1562:9: warning: variable 'cnt' set but not used [-Wunused-but-set-variable]
int i, cnt = 0, first_stack_regno, last_stack_regno;
^
arch/x86/net/bpf_jit_comp32.c:1655:9: warning: variable 'cnt' set but not used [-Wunused-but-set-variable]
int i, cnt = 0;
^
23 warnings and 1 error generated.
vim +/__x86_indirect_thunk_edx +1367 arch/x86/net/bpf_jit_comp32.c
1269
1270 /*
1271 * Generate the following code:
1272 * ... bpf_tail_call(void *ctx, struct bpf_array *array, u64 index) ...
1273 * if (index >= array->map.max_entries)
1274 * goto out;
1275 * if (++tail_call_cnt > MAX_TAIL_CALL_CNT)
1276 * goto out;
1277 * prog = array->ptrs[index];
1278 * if (prog == NULL)
1279 * goto out;
1280 * goto *(prog->bpf_func + prologue_size);
1281 * out:
1282 */
1283 static void emit_bpf_tail_call(u8 **pprog, u8 *ip)
1284 {
1285 u8 *prog = *pprog;
1286 int cnt = 0;
1287 const u8 *r1 = bpf2ia32[BPF_REG_1];
1288 const u8 *r2 = bpf2ia32[BPF_REG_2];
1289 const u8 *r3 = bpf2ia32[BPF_REG_3];
1290 const u8 *tcc = bpf2ia32[TCALL_CNT];
1291 u32 lo, hi;
1292 static int jmp_label1 = -1;
1293
1294 /*
1295 * if (index >= array->map.max_entries)
1296 * goto out;
1297 */
1298 /* mov eax,dword ptr [ebp+off] */
1299 EMIT3(0x8B, add_2reg(0x40, IA32_EBP, IA32_EAX), STACK_VAR(r2[0]));
1300 /* mov edx,dword ptr [ebp+off] */
1301 EMIT3(0x8B, add_2reg(0x40, IA32_EBP, IA32_EDX), STACK_VAR(r3[0]));
1302
1303 /* cmp dword ptr [eax+off],edx */
1304 EMIT3(0x39, add_2reg(0x40, IA32_EAX, IA32_EDX),
1305 offsetof(struct bpf_array, map.max_entries));
1306 /* jbe out */
1307 EMIT2(IA32_JBE, jmp_label(jmp_label1, 2));
1308
1309 /*
1310 * if (tail_call_cnt > MAX_TAIL_CALL_CNT)
1311 * goto out;
1312 */
1313 lo = (u32)MAX_TAIL_CALL_CNT;
1314 hi = (u32)((u64)MAX_TAIL_CALL_CNT >> 32);
1315 EMIT3(0x8B, add_2reg(0x40, IA32_EBP, IA32_ECX), STACK_VAR(tcc[0]));
1316 EMIT3(0x8B, add_2reg(0x40, IA32_EBP, IA32_EBX), STACK_VAR(tcc[1]));
1317
1318 /* cmp edx,hi */
1319 EMIT3(0x83, add_1reg(0xF8, IA32_EBX), hi);
1320 EMIT2(IA32_JNE, 3);
1321 /* cmp ecx,lo */
1322 EMIT3(0x83, add_1reg(0xF8, IA32_ECX), lo);
1323
1324 /* ja out */
1325 EMIT2(IA32_JAE, jmp_label(jmp_label1, 2));
1326
1327 /* add eax,0x1 */
1328 EMIT3(0x83, add_1reg(0xC0, IA32_ECX), 0x01);
1329 /* adc ebx,0x0 */
1330 EMIT3(0x83, add_1reg(0xD0, IA32_EBX), 0x00);
1331
1332 /* mov dword ptr [ebp+off],eax */
1333 EMIT3(0x89, add_2reg(0x40, IA32_EBP, IA32_ECX), STACK_VAR(tcc[0]));
1334 /* mov dword ptr [ebp+off],edx */
1335 EMIT3(0x89, add_2reg(0x40, IA32_EBP, IA32_EBX), STACK_VAR(tcc[1]));
1336
1337 /* prog = array->ptrs[index]; */
1338 /* mov edx, [eax + edx * 4 + offsetof(...)] */
1339 EMIT3_off32(0x8B, 0x94, 0x90, offsetof(struct bpf_array, ptrs));
1340
1341 /*
1342 * if (prog == NULL)
1343 * goto out;
1344 */
1345 /* test edx,edx */
1346 EMIT2(0x85, add_2reg(0xC0, IA32_EDX, IA32_EDX));
1347 /* je out */
1348 EMIT2(IA32_JE, jmp_label(jmp_label1, 2));
1349
1350 /* goto *(prog->bpf_func + prologue_size); */
1351 /* mov edx, dword ptr [edx + 32] */
1352 EMIT3(0x8B, add_2reg(0x40, IA32_EDX, IA32_EDX),
1353 offsetof(struct bpf_prog, bpf_func));
1354 /* add edx,prologue_size */
1355 EMIT3(0x83, add_1reg(0xC0, IA32_EDX), PROLOGUE_SIZE);
1356
1357 /* mov eax,dword ptr [ebp+off] */
1358 EMIT3(0x8B, add_2reg(0x40, IA32_EBP, IA32_EAX), STACK_VAR(r1[0]));
1359
1360 /*
1361 * Now we're ready to jump into next BPF program:
1362 * eax == ctx (1st arg)
1363 * edx == prog->bpf_func + prologue_size
1364 */
1365 #ifdef CONFIG_RETPOLINE
1366 ip += prog - *pprog;
> 1367 EMIT1_off32(0xE9, __x86_indirect_thunk_edx - (ip + 5));
1368 #else
1369 EMIT2(0xFF, 0xE2);
1370 #endif
1371
1372 if (jmp_label1 == -1)
1373 jmp_label1 = cnt;
1374
1375 /* out: */
1376 *pprog = prog;
1377 }
1378
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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