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Mon, 5 Dec 2022 16:32:47 +0000 Received: from DS0PR10MB6798.namprd10.prod.outlook.com ([fe80::6e94:e2a2:ca1f:2a7]) by DS0PR10MB6798.namprd10.prod.outlook.com ([fe80::6e94:e2a2:ca1f:2a7%9]) with mapi id 15.20.5880.014; Mon, 5 Dec 2022 16:32:47 +0000 From: Nick Alcock To: mcgrof@kernel.org, masahiroy@kernel.org Cc: linux-modules@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linux-kernel@vger.kernel.org, arnd@arndb.de, akpm@linux-foundation.org, eugene.loh@oracle.com, kris.van.hees@oracle.com Subject: [PATCH v10 08/13] kbuild: make address ranges map work with IBT Date: Mon, 5 Dec 2022 16:31:52 +0000 Message-Id: <20221205163157.269335-9-nick.alcock@oracle.com> X-Mailer: git-send-email 2.38.0.266.g481848f278 In-Reply-To: <20221205163157.269335-1-nick.alcock@oracle.com> References: <20221205163157.269335-1-nick.alcock@oracle.com> X-ClientProxiedBy: LO4P123CA0019.GBRP123.PROD.OUTLOOK.COM (2603:10a6:600:151::6) To DS0PR10MB6798.namprd10.prod.outlook.com (2603:10b6:8:13c::20) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS0PR10MB6798:EE_|DS7PR10MB7324:EE_ X-MS-Office365-Filtering-Correlation-Id: 4bcffff0-422e-4ff2-9438-08dad6de57e8 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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this is used by kallmodsyms to let us associate symbols with object file names and kernel module names at address-range granularity (i.e., space-efficiently). But the previous commit only works if the final linker runs directly on the input .o files from the kernel build: if an intermediate ld -r is done, the final link emits a mapfile containing only the name of the intermediate ld -r (vmlinux.o), which messes up .tmp_vmlinux.ranges and makes kallmodsyms attribute all symbols to {vmlinux.o} which isn't much use for disambiguation. vmlinux.o has the object file names we need, but the addresses are all wrong so we can't use that either. This commit fixes that by extracting the addresses from the final vmlinux mapfile (or one of the intermediate kallsyms mapfiles) and using them to adjust the address/objfile name pairs extracted from the vmlinux.o mapfile, giving us a ranges map with the right addresses and the right names. It's a bit painful because the addresses are often large numbers, and awk is... not good at handling them (GNU awk can use large integers, but the feature is at risk of removal). So we emit a slightly different file format with a pair of hex values (the address in vmlinux.o and section address from the final mapfile), then pipe it through a tiny new C filter (scripts/addaddrs) whose only purpose is to add those two numbers together! One niggle is that .hot/.cold stuff is no longer correctly attributed to its object file any more -- it seems to not appear in any of the mapfiles at all (only in System.map), so I don't see any way to fix this. (This possibly makes it work with clang LTO too, but I haven't tested it, and if the mapfile format differs it will fail until that's fixed. But this definitely overcomes *one* of the roadblocks preventing clang LTO from working with kallmodsyms.) Signed-off-by: Nick Alcock Reviewed-by: Kris Van Hees --- Notes: v10: new. Documentation/dontdiff | 1 + init/Kconfig | 10 ++++++++++ scripts/.gitignore | 1 + scripts/Makefile | 1 + scripts/Makefile.vmlinux_o | 6 +++++- scripts/addaddrs.c | 28 ++++++++++++++++++++++++++++ scripts/link-vmlinux.sh | 34 +++++++++++++++++++++++++--------- 7 files changed, 71 insertions(+), 10 deletions(-) create mode 100644 scripts/addaddrs.c diff --git a/Documentation/dontdiff b/Documentation/dontdiff index 17686f59039c..72c089eea111 100644 --- a/Documentation/dontdiff +++ b/Documentation/dontdiff @@ -79,6 +79,7 @@ SCCS System.map* TAGS aconf +addaddrs af_names.h aic7*reg.h* aic7*reg_print.c* diff --git a/init/Kconfig b/init/Kconfig index c45935cd2f1f..160ec1370594 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -1570,6 +1570,16 @@ config POSIX_TIMERS If unsure say y. +config KALLMODSYMS + default y + bool "Enable support for /proc/kallmodsyms" if EXPERT + depends on KALLSYMS + select VMLINUX_MAP + help + This option enables the /proc/kallmodsyms file, which unambiguously + maps built-in kernel symbols and their associated object files and + modules to addresses. + config PRINTK default y bool "Enable support for printk" if EXPERT diff --git a/scripts/.gitignore b/scripts/.gitignore index b7aec8eb1bd4..d042f0e3d13f 100644 --- a/scripts/.gitignore +++ b/scripts/.gitignore @@ -1,4 +1,5 @@ # SPDX-License-Identifier: GPL-2.0-only +/addaddrs /asn1_compiler /bin2c /generate_rust_target diff --git a/scripts/Makefile b/scripts/Makefile index 1575af84d557..356cafcd313d 100644 --- a/scripts/Makefile +++ b/scripts/Makefile @@ -5,6 +5,7 @@ hostprogs-always-$(CONFIG_BUILD_BIN2C) += bin2c hostprogs-always-$(CONFIG_KALLSYMS) += kallsyms +hostprogs-always-$(CONFIG_KALLMODSYMS) += addaddrs hostprogs-always-$(BUILD_C_RECORDMCOUNT) += recordmcount hostprogs-always-$(CONFIG_BUILDTIME_TABLE_SORT) += sorttable hostprogs-always-$(CONFIG_ASN1) += asn1_compiler diff --git a/scripts/Makefile.vmlinux_o b/scripts/Makefile.vmlinux_o index 9b4ca83f0695..94c2ec366b91 100644 --- a/scripts/Makefile.vmlinux_o +++ b/scripts/Makefile.vmlinux_o @@ -27,6 +27,10 @@ ifdef CONFIG_LTO_CLANG initcalls-lds := .tmp_initcalls.lds endif +ifneq ($(CONFIG_VMLINUX_MAP)$(CONFIG_KALLMODSYMS),) +KBUILD_MAPFLAGS = -Map=$@.map +endif + # objtool for vmlinux.o # --------------------------------------------------------------------------- # @@ -47,7 +51,7 @@ objtool-args = $(vmlinux-objtool-args-y) --link quiet_cmd_ld_vmlinux.o = LD $@ cmd_ld_vmlinux.o = \ $(LD) ${KBUILD_LDFLAGS} -r -o $@ \ - $(addprefix -T , $(initcalls-lds)) \ + $(KBUILD_MAPFLAGS) $(addprefix -T , $(initcalls-lds)) \ --whole-archive vmlinux.a --no-whole-archive \ --start-group $(KBUILD_VMLINUX_LIBS) --end-group \ $(cmd_objtool) diff --git a/scripts/addaddrs.c b/scripts/addaddrs.c new file mode 100644 index 000000000000..d15cbbf8d262 --- /dev/null +++ b/scripts/addaddrs.c @@ -0,0 +1,28 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +/* Used only by link-vmlinux.sh */ + +#include +#include +#include + +int main (void) +{ + int i = 0; + while (!feof(stdin)) { + uint64_t a, b; + int ret; + char *rest = NULL; + + i++; + if ((ret = scanf("%" SCNx64 " %" SCNx64 " %m[^\n]\n", &a, &b, &rest)) < 3) { + fprintf(stderr, + "Syntax error: invalid line %i found in rangefile generation: at least three fields expected, %i converted\n", i, ret); + exit(1); + } + + printf("0x%018" PRIx64 " %s\n", a+b, rest); + free(rest); + } + exit(0); +} diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh index a40d372b1289..3b3ea6214062 100755 --- a/scripts/link-vmlinux.sh +++ b/scripts/link-vmlinux.sh @@ -60,10 +60,7 @@ vmlinux_link() # skip output file argument shift - # kallmodsyms needs a linker mapfile that contains original object - # file names, so cannot use this optimization. - if { is_enabled CONFIG_LTO_CLANG || is_enabled CONFIG_X86_KERNEL_IBT; } && \ - ! is_enabled CONFIG_KALLMODSYMS; then + if is_enabled CONFIG_LTO_CLANG || is_enabled CONFIG_X86_KERNEL_IBT; then # Use vmlinux.o instead of performing the slow LTO link again. objs=vmlinux.o libs= @@ -153,12 +150,31 @@ kallsyms() # - but sometimes there is a line break after the first field # - start reading at "Linker script and memory map" # - stop reading at ".brk" + # if there is a vmlinux.o.map and LTO_CLANG or KERNEL_IBT are + # turned on, we have used a vmlinux -r'ed .o for linking: use this + # as our primary information source, but acquire section addresses + # from the (later) linker map we were passed in. This makes things + # a bit more complex, since we have to recognize and eliminate + # sections elided by the linker, and add together numbers larger + # than awk can portably handle. if is_enabled CONFIG_KALLMODSYMS; then - ${AWK} ' - /\.o$/ && start==1 { print $(NF-2), $(NF-1), $NF } - /^Linker script and memory map/ { start = 1 } - /^\.brk/ { exit(0) } - ' ${3} | sort > .tmp_vmlinux.ranges + if is_enabled CONFIG_LTO_CLANG || is_enabled CONFIG_X86_KERNEL_IBT; then + ${AWK} 'BEGIN { addresses = 1 } + /^Linker script and memory map/ { start = 1 } + !start { next } + { got_section = 0 } + /^ \./ { section = $1; got_section = 1; if (NF == 1) { getline }} + addresses && got_section && !(section in addrs) { addrs[section] = $2 } + !addresses && got_section && section in addrs { print $(NF-2), addrs[section], $(NF-1), $NF } + /^\.brk/ || /^\.bss\.\.brk/ { addresses = 0; start = 0; nextfile } + ' ${3} vmlinux.o.map | scripts/addaddrs | sort > .tmp_vmlinux.ranges + else + ${AWK} ' + start && /\.o$/ { print $(NF-2), $(NF-1), $NF } + /^Linker script and memory map/ { start = 1 } + /^\.brk/ { exit(0) } + ' ${3} | sort > .tmp_vmlinux.ranges + fi fi # get kallsyms options