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Subject[PATCH 1/2] kallsyms: architecture specific symbol lookups
Date
Provide CONFIG_ARCH_HAS_ADDRESS_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 <npiggin@gmail.com>
---
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..8fdd44873373 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_ADDRESS_LOOKUP
+const char *arch_address_lookup(unsigned long addr,
+ unsigned long *symbolsize,
+ unsigned long *offset,
+ char **modname, char *namebuf);
+unsigned long arch_address_lookup_name(const char *name);
+#else
+static inline const char *arch_address_lookup(unsigned long addr,
+ unsigned long *symbolsize,
+ unsigned long *offset,
+ char **modname, char *namebuf)
+{
+ return NULL;
+}
+static inline unsigned long arch_address_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 a9b3f660dee7..580c762fadd8 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_address_lookup_name(name);
}
EXPORT_SYMBOL_GPL(kallsyms_lookup_name);

@@ -311,6 +317,11 @@ const char *kallsyms_lookup(unsigned long addr,
if (!ret)
ret = ftrace_mod_address_lookup(addr, symbolsize,
offset, modname, namebuf);
+
+ if (!ret)
+ ret = arch_address_lookup(addr, symbolsize,
+ offset, modname, namebuf);
+
return ret;
}

diff --git a/lib/Kconfig b/lib/Kconfig
index bc7e56370129..16d3b8dbcadf 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_ADDRESS_LOOKUP
+ bool
+
config INDIRECT_PIO
bool "Access I/O in non-MMIO mode"
depends on ARM64
--
2.23.0
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