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Mon, 23 May 2022 17:56:00 +0000 (GMT) Received: from li-c3569c4c-1ef8-11b2-a85c-ee139cda3133.ibm.com.com (unknown [9.43.16.198]) by d06av21.portsmouth.uk.ibm.com (Postfix) with ESMTP id D546F5204F; Mon, 23 May 2022 17:55:57 +0000 (GMT) From: Sathvika Vasireddy To: linuxppc-dev@lists.ozlabs.org Subject: [RFC PATCH 1/4] objtool: Add --mnop as an option to --mcount Date: Mon, 23 May 2022 23:25:45 +0530 Message-Id: <20220523175548.922671-2-sv@linux.ibm.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20220523175548.922671-1-sv@linux.ibm.com> References: <20220523175548.922671-1-sv@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: uChw7Y5RZjncb0nPFAS_b_ekcCoyPD56 X-Proofpoint-GUID: D1WkZO3huPy2hLVgdyTwuzQeSJBk9k_3 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.874,Hydra:6.0.486,FMLib:17.11.64.514 definitions=2022-05-23_07,2022-05-23_01,2022-02-23_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 mlxscore=0 phishscore=0 adultscore=0 mlxlogscore=999 clxscore=1015 lowpriorityscore=0 malwarescore=0 bulkscore=0 suspectscore=0 priorityscore=1501 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2202240000 definitions=main-2205230099 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: peterz@infradead.org, linux-kernel@vger.kernel.org, aik@ozlabs.ru, sv@linux.ibm.com, rostedt@goodmis.org, jpoimboe@redhat.com, naveen.n.rao@linux.vnet.ibm.com, mbenes@suse.cz Errors-To: linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" Architectures can select HAVE_NOP_MCOUNT if they choose to nop out mcount call sites. If that config option is selected, then --mnop is passed as an option to objtool, along with --mcount. Also, make sure that --mnop can be passed as an option to objtool only when --mcount is passed. Signed-off-by: Sathvika Vasireddy --- Makefile | 4 +++- arch/x86/Kconfig | 1 + scripts/Makefile.build | 1 + tools/objtool/builtin-check.c | 14 ++++++++++++++ tools/objtool/check.c | 19 ++++++++++--------- tools/objtool/include/objtool/builtin.h | 1 + 6 files changed, 30 insertions(+), 10 deletions(-) diff --git a/Makefile b/Makefile index 250707647359..acaf88e3c694 100644 --- a/Makefile +++ b/Makefile @@ -851,7 +851,9 @@ ifdef CONFIG_FTRACE_MCOUNT_USE_CC endif endif ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL - CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT + ifdef CONFIG_HAVE_NOP_MCOUNT + CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT + endif endif ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT ifdef CONFIG_HAVE_C_RECORDMCOUNT diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 1847d6e974a1..4a41bfb644f0 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -189,6 +189,7 @@ config X86 select HAVE_CONTEXT_TRACKING_OFFSTACK if HAVE_CONTEXT_TRACKING select HAVE_C_RECORDMCOUNT select HAVE_OBJTOOL_MCOUNT if HAVE_OBJTOOL + select HAVE_NOP_MCOUNT if HAVE_OBJTOOL_MCOUNT select HAVE_BUILDTIME_MCOUNT_SORT select HAVE_DEBUG_KMEMLEAK select HAVE_DMA_CONTIGUOUS diff --git a/scripts/Makefile.build b/scripts/Makefile.build index ac8167227bc0..2e0c3f9c1459 100644 --- a/scripts/Makefile.build +++ b/scripts/Makefile.build @@ -231,6 +231,7 @@ objtool_args = \ $(if $(CONFIG_HAVE_NOINSTR_HACK), --hacks=noinstr) \ $(if $(CONFIG_X86_KERNEL_IBT), --ibt) \ $(if $(CONFIG_FTRACE_MCOUNT_USE_OBJTOOL), --mcount) \ + $(if $(CONFIG_HAVE_NOP_MCOUNT), --mnop) \ $(if $(CONFIG_UNWINDER_ORC), --orc) \ $(if $(CONFIG_RETPOLINE), --retpoline) \ $(if $(CONFIG_SLS), --sls) \ diff --git a/tools/objtool/builtin-check.c b/tools/objtool/builtin-check.c index f4c3a5091737..b05e2108c0c3 100644 --- a/tools/objtool/builtin-check.c +++ b/tools/objtool/builtin-check.c @@ -80,6 +80,7 @@ const struct option check_options[] = { OPT_BOOLEAN(0, "dry-run", &opts.dryrun, "don't write modifications"), OPT_BOOLEAN(0, "link", &opts.link, "object is a linked object"), OPT_BOOLEAN(0, "module", &opts.module, "object is part of a kernel module"), + OPT_BOOLEAN(0, "mnop", &opts.mnop, "nop out mcount call sites"), OPT_BOOLEAN(0, "no-unreachable", &opts.no_unreachable, "skip 'unreachable instruction' warnings"), OPT_BOOLEAN(0, "sec-address", &opts.sec_address, "print section addresses in warnings"), OPT_BOOLEAN(0, "stats", &opts.stats, "print statistics"), @@ -142,6 +143,16 @@ static bool opts_valid(void) return false; } +static bool mnop_opts_valid(void) +{ + if (opts.mnop && !opts.mcount) { + ERROR("--mnop requires --mcount"); + return false; + } + + return true; +} + static bool link_opts_valid(struct objtool_file *file) { if (opts.link) @@ -185,6 +196,9 @@ int objtool_run(int argc, const char **argv) if (!file) return 1; + if (!mnop_opts_valid()) + return 1; + if (!link_opts_valid(file)) return 1; diff --git a/tools/objtool/check.c b/tools/objtool/check.c index 190b2f6e360a..056302d58e23 100644 --- a/tools/objtool/check.c +++ b/tools/objtool/check.c @@ -1175,17 +1175,18 @@ static void annotate_call_site(struct objtool_file *file, if (opts.mcount && sym->fentry) { if (sibling) WARN_FUNC("Tail call to __fentry__ !?!?", insn->sec, insn->offset); + if (opts.mnop) { + if (reloc) { + reloc->type = R_NONE; + elf_write_reloc(file->elf, reloc); + } - if (reloc) { - reloc->type = R_NONE; - elf_write_reloc(file->elf, reloc); - } - - elf_write_insn(file->elf, insn->sec, - insn->offset, insn->len, - arch_nop_insn(insn->len)); + elf_write_insn(file->elf, insn->sec, + insn->offset, insn->len, + arch_nop_insn(insn->len)); - insn->type = INSN_NOP; + insn->type = INSN_NOP; + } list_add_tail(&insn->call_node, &file->mcount_loc_list); return; diff --git a/tools/objtool/include/objtool/builtin.h b/tools/objtool/include/objtool/builtin.h index 280ea18b7f2b..71ed3152a18e 100644 --- a/tools/objtool/include/objtool/builtin.h +++ b/tools/objtool/include/objtool/builtin.h @@ -29,6 +29,7 @@ struct opts { bool backup; bool dryrun; bool link; + bool mnop; bool module; bool no_unreachable; bool sec_address; From patchwork Mon May 23 17:55:46 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sathvika Vasireddy X-Patchwork-Id: 1634648 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: bilbo.ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=ibm.com header.i=@ibm.com header.a=rsa-sha256 header.s=pp1 header.b=VYAEjSu8; 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Mon, 23 May 2022 17:56:02 +0000 (GMT) From: Sathvika Vasireddy To: linuxppc-dev@lists.ozlabs.org Subject: [RFC PATCH 2/4] objtool: Enable objtool to run only on files with ftrace enabled Date: Mon, 23 May 2022 23:25:46 +0530 Message-Id: <20220523175548.922671-3-sv@linux.ibm.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20220523175548.922671-1-sv@linux.ibm.com> References: <20220523175548.922671-1-sv@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: zGqR_cdO5w9EzBEebYwZ_Glhya1ShdP7 X-Proofpoint-GUID: bnWaIZ7VLab2xF1nO8dP-ejF7KjP8ACq X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.874,Hydra:6.0.486,FMLib:17.11.64.514 definitions=2022-05-23_07,2022-05-23_01,2022-02-23_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 clxscore=1015 suspectscore=0 mlxlogscore=721 spamscore=0 priorityscore=1501 adultscore=0 phishscore=0 bulkscore=0 lowpriorityscore=0 mlxscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2202240000 definitions=main-2205230099 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: peterz@infradead.org, linux-kernel@vger.kernel.org, aik@ozlabs.ru, sv@linux.ibm.com, rostedt@goodmis.org, jpoimboe@redhat.com, naveen.n.rao@linux.vnet.ibm.com, mbenes@suse.cz Errors-To: linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" This patch makes sure objtool runs only on the object files that have ftrace enabled, instead of running on all the object files. Signed-off-by: Naveen N. Rao Signed-off-by: Sathvika Vasireddy --- scripts/Makefile.build | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/scripts/Makefile.build b/scripts/Makefile.build index 2e0c3f9c1459..06ceffd92921 100644 --- a/scripts/Makefile.build +++ b/scripts/Makefile.build @@ -258,8 +258,8 @@ else # 'OBJECT_FILES_NON_STANDARD_foo.o := 'y': skip objtool checking for a file # 'OBJECT_FILES_NON_STANDARD_foo.o := 'n': override directory skip for a file -$(obj)/%.o: objtool-enabled = $(if $(filter-out y%, \ - $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n),y) +$(obj)/%.o: objtool-enabled = $(and $(if $(filter-out y%, $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n),y), \ + $(if $(findstring $(strip $(CC_FLAGS_FTRACE)),$(_c_flags)),y),y) endif From patchwork Mon May 23 17:55:47 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sathvika Vasireddy X-Patchwork-Id: 1634653 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: bilbo.ozlabs.org; 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Mon, 23 May 2022 17:56:06 +0000 (GMT) From: Sathvika Vasireddy To: linuxppc-dev@lists.ozlabs.org Subject: [RFC PATCH 3/4] objtool/powerpc: Enable objtool to be built on ppc Date: Mon, 23 May 2022 23:25:47 +0530 Message-Id: <20220523175548.922671-4-sv@linux.ibm.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20220523175548.922671-1-sv@linux.ibm.com> References: <20220523175548.922671-1-sv@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: iJJgpiJkKPhpPgj1QMImz7q8HqYu8mXO X-Proofpoint-ORIG-GUID: XRjVD49JreGGfIwC_ec9yGERDtl8niL0 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.874,Hydra:6.0.486,FMLib:17.11.64.514 definitions=2022-05-23_07,2022-05-23_01,2022-02-23_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 mlxscore=0 suspectscore=0 malwarescore=0 clxscore=1015 impostorscore=0 priorityscore=1501 mlxlogscore=999 lowpriorityscore=0 phishscore=0 spamscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2202240000 definitions=main-2205230099 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: peterz@infradead.org, linux-kernel@vger.kernel.org, aik@ozlabs.ru, sv@linux.ibm.com, rostedt@goodmis.org, jpoimboe@redhat.com, naveen.n.rao@linux.vnet.ibm.com, mbenes@suse.cz Errors-To: linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" This patch adds [stub] implementations for required functions, inorder to enable objtool build on powerpc. Signed-off-by: Sathvika Vasireddy --- arch/powerpc/Kconfig | 1 + tools/objtool/arch/powerpc/Build | 2 + tools/objtool/arch/powerpc/decode.c | 73 +++++++++++++++++++ .../arch/powerpc/include/arch/cfi_regs.h | 11 +++ tools/objtool/arch/powerpc/include/arch/elf.h | 8 ++ .../arch/powerpc/include/arch/endianness.h | 9 +++ .../arch/powerpc/include/arch/special.h | 21 ++++++ tools/objtool/arch/powerpc/special.c | 19 +++++ 8 files changed, 144 insertions(+) create mode 100644 tools/objtool/arch/powerpc/Build create mode 100644 tools/objtool/arch/powerpc/decode.c create mode 100644 tools/objtool/arch/powerpc/include/arch/cfi_regs.h create mode 100644 tools/objtool/arch/powerpc/include/arch/elf.h create mode 100644 tools/objtool/arch/powerpc/include/arch/endianness.h create mode 100644 tools/objtool/arch/powerpc/include/arch/special.h create mode 100644 tools/objtool/arch/powerpc/special.c diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 174edabb74fa..732a3f91ee5e 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -232,6 +232,7 @@ config PPC select HAVE_MOD_ARCH_SPECIFIC select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S) select HAVE_OPTPROBES + select HAVE_OBJTOOL if PPC64 select HAVE_PERF_EVENTS select HAVE_PERF_EVENTS_NMI if PPC64 select HAVE_PERF_REGS diff --git a/tools/objtool/arch/powerpc/Build b/tools/objtool/arch/powerpc/Build new file mode 100644 index 000000000000..d24d5636a5b8 --- /dev/null +++ b/tools/objtool/arch/powerpc/Build @@ -0,0 +1,2 @@ +objtool-y += decode.o +objtool-y += special.o diff --git a/tools/objtool/arch/powerpc/decode.c b/tools/objtool/arch/powerpc/decode.c new file mode 100644 index 000000000000..e3b77a6ce357 --- /dev/null +++ b/tools/objtool/arch/powerpc/decode.c @@ -0,0 +1,73 @@ +// SPDX-License-Identifier: GPL-2.0-or-later + +#include +#include +#include +#include +#include +#include +#include + +unsigned long arch_dest_reloc_offset(int addend) +{ + return addend; +} + +bool arch_callee_saved_reg(unsigned char reg) +{ + return false; +} + +int arch_decode_hint_reg(u8 sp_reg, int *base) +{ + return 0; +} + +const char *arch_nop_insn(int len) +{ + return NULL; +} + +const char *arch_ret_insn(int len) +{ + return NULL; +} + +int arch_decode_instruction(struct objtool_file *file, const struct section *sec, + unsigned long offset, unsigned int maxlen, + unsigned int *len, enum insn_type *type, + unsigned long *immediate, + struct list_head *ops_list) +{ + u32 insn; + + *immediate = 0; + memcpy(&insn, sec->data->d_buf+offset, 4); + *len = 4; + *type = INSN_OTHER; + + return 0; +} + +unsigned long arch_jump_destination(struct instruction *insn) +{ + return insn->offset + insn->immediate; +} + +void arch_initial_func_cfi_state(struct cfi_init_state *state) +{ + int i; + + for (i = 0; i < CFI_NUM_REGS; i++) { + state->regs[i].base = CFI_UNDEFINED; + state->regs[i].offset = 0; + } + + /* initial CFA (call frame address) */ + state->cfa.base = CFI_SP; + state->cfa.offset = 0; + + /* initial LR (return address) */ + state->regs[CFI_RA].base = CFI_CFA; + state->regs[CFI_RA].offset = 0; +} diff --git a/tools/objtool/arch/powerpc/include/arch/cfi_regs.h b/tools/objtool/arch/powerpc/include/arch/cfi_regs.h new file mode 100644 index 000000000000..59638ebeafc8 --- /dev/null +++ b/tools/objtool/arch/powerpc/include/arch/cfi_regs.h @@ -0,0 +1,11 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ + +#ifndef _OBJTOOL_CFI_REGS_H +#define _OBJTOOL_CFI_REGS_H + +#define CFI_BP 1 +#define CFI_SP CFI_BP +#define CFI_RA 32 +#define CFI_NUM_REGS 33 + +#endif diff --git a/tools/objtool/arch/powerpc/include/arch/elf.h b/tools/objtool/arch/powerpc/include/arch/elf.h new file mode 100644 index 000000000000..3c8ebb7d2a6b --- /dev/null +++ b/tools/objtool/arch/powerpc/include/arch/elf.h @@ -0,0 +1,8 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ + +#ifndef _OBJTOOL_ARCH_ELF +#define _OBJTOOL_ARCH_ELF + +#define R_NONE R_PPC_NONE + +#endif /* _OBJTOOL_ARCH_ELF */ diff --git a/tools/objtool/arch/powerpc/include/arch/endianness.h b/tools/objtool/arch/powerpc/include/arch/endianness.h new file mode 100644 index 000000000000..7c362527da20 --- /dev/null +++ b/tools/objtool/arch/powerpc/include/arch/endianness.h @@ -0,0 +1,9 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +#ifndef _ARCH_ENDIANNESS_H +#define _ARCH_ENDIANNESS_H + +#include + +#define __TARGET_BYTE_ORDER __LITTLE_ENDIAN + +#endif /* _ARCH_ENDIANNESS_H */ diff --git a/tools/objtool/arch/powerpc/include/arch/special.h b/tools/objtool/arch/powerpc/include/arch/special.h new file mode 100644 index 000000000000..ffef9ada7133 --- /dev/null +++ b/tools/objtool/arch/powerpc/include/arch/special.h @@ -0,0 +1,21 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +#ifndef _PPC_ARCH_SPECIAL_H +#define _PPC_ARCH_SPECIAL_H + +#define EX_ENTRY_SIZE 8 +#define EX_ORIG_OFFSET 0 +#define EX_NEW_OFFSET 4 + +#define JUMP_ENTRY_SIZE 16 +#define JUMP_ORIG_OFFSET 0 +#define JUMP_NEW_OFFSET 4 +#define JUMP_KEY_OFFSET 8 + +#define ALT_ENTRY_SIZE 12 +#define ALT_ORIG_OFFSET 0 +#define ALT_NEW_OFFSET 4 +#define ALT_FEATURE_OFFSET 8 +#define ALT_ORIG_LEN_OFFSET 10 +#define ALT_NEW_LEN_OFFSET 11 + +#endif /* _PPC_ARCH_SPECIAL_H */ diff --git a/tools/objtool/arch/powerpc/special.c b/tools/objtool/arch/powerpc/special.c new file mode 100644 index 000000000000..e3e75cbab858 --- /dev/null +++ b/tools/objtool/arch/powerpc/special.c @@ -0,0 +1,19 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +#include + +#include +#include + + +bool arch_support_alt_relocation(struct special_alt *special_alt, + struct instruction *insn, + struct reloc *reloc) +{ + return false; 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Mon, 23 May 2022 17:56:18 GMT Received: from ppma02fra.de.ibm.com (47.49.7a9f.ip4.static.sl-reverse.com [159.122.73.71]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 3g88yvs480-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 23 May 2022 17:56:18 +0000 Received: from pps.filterd (ppma02fra.de.ibm.com [127.0.0.1]) by ppma02fra.de.ibm.com (8.16.1.2/8.16.1.2) with SMTP id 24NHgoWG011584; Mon, 23 May 2022 17:56:16 GMT Received: from b06avi18878370.portsmouth.uk.ibm.com (b06avi18878370.portsmouth.uk.ibm.com [9.149.26.194]) by ppma02fra.de.ibm.com with ESMTP id 3g6qq93jqd-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 23 May 2022 17:56:16 +0000 Received: from d06av21.portsmouth.uk.ibm.com (d06av21.portsmouth.uk.ibm.com [9.149.105.232]) by b06avi18878370.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 24NHtRwC31916520 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 23 May 2022 17:55:27 GMT Received: from d06av21.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 631B952050; Mon, 23 May 2022 17:56:14 +0000 (GMT) Received: from li-c3569c4c-1ef8-11b2-a85c-ee139cda3133.ibm.com.com (unknown [9.43.16.198]) by d06av21.portsmouth.uk.ibm.com (Postfix) with ESMTP id 2D30B5204F; Mon, 23 May 2022 17:56:10 +0000 (GMT) From: Sathvika Vasireddy To: linuxppc-dev@lists.ozlabs.org Subject: [RFC PATCH 4/4] objtool/powerpc: Add --mcount specific implementation Date: Mon, 23 May 2022 23:25:48 +0530 Message-Id: <20220523175548.922671-5-sv@linux.ibm.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20220523175548.922671-1-sv@linux.ibm.com> References: <20220523175548.922671-1-sv@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: buX_qKCr5AM5AFX50afFueyUjRwiaumN X-Proofpoint-GUID: 9x78_XVgk9THSzak1_eAXXWTob5GjxeY X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.874,Hydra:6.0.486,FMLib:17.11.64.514 definitions=2022-05-23_07,2022-05-23_01,2022-02-23_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 priorityscore=1501 mlxlogscore=731 impostorscore=0 malwarescore=0 spamscore=0 phishscore=0 bulkscore=0 lowpriorityscore=0 mlxscore=0 adultscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2202240000 definitions=main-2205230099 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: peterz@infradead.org, linux-kernel@vger.kernel.org, aik@ozlabs.ru, sv@linux.ibm.com, rostedt@goodmis.org, jpoimboe@redhat.com, naveen.n.rao@linux.vnet.ibm.com, mbenes@suse.cz Errors-To: linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" This patch enables objtool --mcount on powerpc, and adds implementation specific to powerpc. Signed-off-by: Sathvika Vasireddy --- arch/powerpc/Kconfig | 1 + tools/objtool/arch/powerpc/decode.c | 14 ++++++++++++++ tools/objtool/check.c | 12 +++++++----- tools/objtool/elf.c | 13 +++++++++++++ tools/objtool/include/objtool/elf.h | 1 + 5 files changed, 36 insertions(+), 5 deletions(-) diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 732a3f91ee5e..3373d44a1298 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -233,6 +233,7 @@ config PPC select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S) select HAVE_OPTPROBES select HAVE_OBJTOOL if PPC64 + select HAVE_OBJTOOL_MCOUNT if HAVE_OBJTOOL select HAVE_PERF_EVENTS select HAVE_PERF_EVENTS_NMI if PPC64 select HAVE_PERF_REGS diff --git a/tools/objtool/arch/powerpc/decode.c b/tools/objtool/arch/powerpc/decode.c index e3b77a6ce357..ad3d79fffac2 100644 --- a/tools/objtool/arch/powerpc/decode.c +++ b/tools/objtool/arch/powerpc/decode.c @@ -40,12 +40,26 @@ int arch_decode_instruction(struct objtool_file *file, const struct section *sec struct list_head *ops_list) { u32 insn; + unsigned int opcode; *immediate = 0; memcpy(&insn, sec->data->d_buf+offset, 4); *len = 4; *type = INSN_OTHER; + opcode = (insn >> 26); + + switch (opcode) { + case 18: /* bl */ + if ((insn & 3) == 1) { + *type = INSN_CALL; + *immediate = insn & 0x3fffffc; + if (*immediate & 0x2000000) + *immediate -= 0x4000000; + } + break; + } + return 0; } diff --git a/tools/objtool/check.c b/tools/objtool/check.c index 056302d58e23..fd8bad092f89 100644 --- a/tools/objtool/check.c +++ b/tools/objtool/check.c @@ -832,7 +832,7 @@ static int create_mcount_loc_sections(struct objtool_file *file) if (elf_add_reloc_to_insn(file->elf, sec, idx * sizeof(unsigned long), - R_X86_64_64, + elf_reloc_type_long(file->elf), insn->sec, insn->offset)) return -1; @@ -2183,7 +2183,7 @@ static int classify_symbols(struct objtool_file *file) if (arch_is_retpoline(func)) func->retpoline_thunk = true; - if (!strcmp(func->name, "__fentry__")) + if ((!strcmp(func->name, "__fentry__")) || (!strcmp(func->name, "_mcount"))) func->fentry = true; if (is_profiling_func(func->name)) @@ -2259,9 +2259,11 @@ static int decode_sections(struct objtool_file *file) * Must be before add_jump_destinations(), which depends on 'func' * being set for alternatives, to enable proper sibling call detection. */ - ret = add_special_section_alts(file); - if (ret) - return ret; + if (opts.stackval || opts.orc || opts.uaccess || opts.noinstr) { + ret = add_special_section_alts(file); + if (ret) + return ret; + } ret = add_jump_destinations(file); if (ret) diff --git a/tools/objtool/elf.c b/tools/objtool/elf.c index c25e957c1e52..95763060d551 100644 --- a/tools/objtool/elf.c +++ b/tools/objtool/elf.c @@ -793,6 +793,19 @@ elf_create_section_symbol(struct elf *elf, struct section *sec) return sym; } +int elf_reloc_type_long(struct elf *elf) +{ + switch (elf->ehdr.e_machine) { + case EM_X86_64: + return R_X86_64_64; + case EM_PPC64: + return R_PPC64_ADDR64; + default: + WARN("unknown machine..."); + exit(-1); + } +} + int elf_add_reloc_to_insn(struct elf *elf, struct section *sec, unsigned long offset, unsigned int type, struct section *insn_sec, unsigned long insn_off) diff --git a/tools/objtool/include/objtool/elf.h b/tools/objtool/include/objtool/elf.h index adebfbc2b518..c43e23c0b3c8 100644 --- a/tools/objtool/include/objtool/elf.h +++ b/tools/objtool/include/objtool/elf.h @@ -144,6 +144,7 @@ static inline bool has_multiple_files(struct elf *elf) struct elf *elf_open_read(const char *name, int flags); struct section *elf_create_section(struct elf *elf, const char *name, unsigned int sh_flags, size_t entsize, int nr); +int elf_reloc_type_long(struct elf *elf); int elf_add_reloc(struct elf *elf, struct section *sec, unsigned long offset, unsigned int type, struct symbol *sym, s64 addend); int elf_add_reloc_to_insn(struct elf *elf, struct section *sec,