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Sat, 02 May 2020 04:19:53 -0700 (PDT) Received: from bobo.ozlabs.ibm.com ([203.220.177.17]) by smtp.gmail.com with ESMTPSA id q15sm3862790pgj.52.2020.05.02.04.19.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 02 May 2020 04:19:53 -0700 (PDT) From: Nicholas Piggin To: linuxppc-dev@lists.ozlabs.org Subject: [RFC PATCH 01/10] kallsyms: architecture specific symbol lookups Date: Sat, 2 May 2020 21:19:05 +1000 Message-Id: <20200502111914.166578-2-npiggin@gmail.com> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20200502111914.166578-1-npiggin@gmail.com> References: <20200502111914.166578-1-npiggin@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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: Nicholas Piggin Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" Provide CONFIG_ARCH_HAS_SYMBOL_LOOKUP which allows architectures to do their own symbol/address lookup if kernel and module lookups miss. powerpc will use this to deal with firmware symbols. Signed-off-by: Nicholas Piggin --- include/linux/kallsyms.h | 20 ++++++++++++++++++++ kernel/kallsyms.c | 13 ++++++++++++- lib/Kconfig | 3 +++ 3 files changed, 35 insertions(+), 1 deletion(-) diff --git a/include/linux/kallsyms.h b/include/linux/kallsyms.h index 657a83b943f0..e17c1e7c01c0 100644 --- a/include/linux/kallsyms.h +++ b/include/linux/kallsyms.h @@ -83,6 +83,26 @@ extern int kallsyms_lookup_size_offset(unsigned long addr, unsigned long *symbolsize, unsigned long *offset); +#ifdef CONFIG_ARCH_HAS_SYMBOL_LOOKUP +const char *arch_symbol_lookup_address(unsigned long addr, + unsigned long *symbolsize, + unsigned long *offset, + char **modname, char *namebuf); +unsigned long arch_symbol_lookup_name(const char *name); +#else +static inline const char *arch_symbol_lookup_address(unsigned long addr, + unsigned long *symbolsize, + unsigned long *offset, + char **modname, char *namebuf) +{ + return NULL; +} +static inline unsigned long arch_symbol_lookup_name(const char *name) +{ + return 0; +} +#endif + /* Lookup an address. modname is set to NULL if it's in the kernel. */ const char *kallsyms_lookup(unsigned long addr, unsigned long *symbolsize, diff --git a/kernel/kallsyms.c b/kernel/kallsyms.c index 16c8c605f4b0..1e403e616126 100644 --- a/kernel/kallsyms.c +++ b/kernel/kallsyms.c @@ -164,6 +164,7 @@ static unsigned long kallsyms_sym_address(int idx) unsigned long kallsyms_lookup_name(const char *name) { char namebuf[KSYM_NAME_LEN]; + unsigned long ret; unsigned long i; unsigned int off; @@ -173,7 +174,12 @@ unsigned long kallsyms_lookup_name(const char *name) if (strcmp(namebuf, name) == 0) return kallsyms_sym_address(i); } - return module_kallsyms_lookup_name(name); + + ret = module_kallsyms_lookup_name(name); + if (ret) + return ret; + + return arch_symbol_lookup_name(name); } int kallsyms_on_each_symbol(int (*fn)(void *, const char *, struct module *, @@ -309,6 +315,11 @@ const char *kallsyms_lookup(unsigned long addr, if (!ret) ret = ftrace_mod_address_lookup(addr, symbolsize, offset, modname, namebuf); + + if (!ret) + ret = arch_symbol_lookup_address(addr, symbolsize, + offset, modname, namebuf); + return ret; } diff --git a/lib/Kconfig b/lib/Kconfig index 5d53f9609c25..9f86f649a712 100644 --- a/lib/Kconfig +++ b/lib/Kconfig @@ -80,6 +80,9 @@ config ARCH_USE_CMPXCHG_LOCKREF config ARCH_HAS_FAST_MULTIPLIER bool +config ARCH_HAS_SYMBOL_LOOKUP + bool + config INDIRECT_PIO bool "Access I/O in non-MMIO mode" depends on ARM64 -- 2.23.0