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authorSergey Senozhatsky <sergey.senozhatsky.work@gmail.com>2017-12-06 13:36:49 +0900
committerPetr Mladek <pmladek@suse.com>2018-01-09 10:45:38 +0100
commit04b8eb7a4ccd9ef9343e2720ccf2a5db8cfe2f67 (patch)
treec9f3302f30c62d5ba093f3abeffe168be0de9eee
parent1705bd6a68171d8b3ba05df9352757ee4e49317b (diff)
symbol lookup: introduce dereference_symbol_descriptor()
dereference_symbol_descriptor() invokes appropriate ARCH specific function descriptor dereference callbacks: - dereference_kernel_function_descriptor() if the pointer is a kernel symbol; - dereference_module_function_descriptor() if the pointer is a module symbol. This is the last step needed to make '%pS/%ps' smart enough to handle function descriptor dereference on affected ARCHs and to retire '%pF/%pf'. To refresh it: Some architectures (ia64, ppc64, parisc64) use an indirect pointer for C function pointers - the function pointer points to a function descriptor and we need to dereference it to get the actual function pointer. Function descriptors live in .opd elf section and all affected ARCHs (ia64, ppc64, parisc64) handle it properly for kernel and modules. So we, technically, can decide if the dereference is needed by simply looking at the pointer: if it belongs to .opd section then we need to dereference it. The kernel and modules have their own .opd sections, obviously, that's why we need to split dereference_function_descriptor() and use separate kernel and module dereference arch callbacks. Link: http://lkml.kernel.org/r/20171206043649.GB15885@jagdpanzerIV Cc: Fenghua Yu <fenghua.yu@intel.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: James Bottomley <jejb@parisc-linux.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Jessica Yu <jeyu@kernel.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: linux-ia64@vger.kernel.org Cc: linux-parisc@vger.kernel.org Cc: linuxppc-dev@lists.ozlabs.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com> Tested-by: Tony Luck <tony.luck@intel.com> #ia64 Tested-by: Santosh Sivaraj <santosh@fossix.org> #powerpc Tested-by: Helge Deller <deller@gmx.de> #parisc64 Signed-off-by: Petr Mladek <pmladek@suse.com>
-rw-r--r--Documentation/printk-formats.txt35
-rw-r--r--include/linux/kallsyms.h54
-rw-r--r--kernel/kallsyms.c35
-rw-r--r--lib/vsprintf.c5
4 files changed, 68 insertions, 61 deletions
diff --git a/Documentation/printk-formats.txt b/Documentation/printk-formats.txt
index 361789df51ec..58c44cce90b6 100644
--- a/Documentation/printk-formats.txt
+++ b/Documentation/printk-formats.txt
@@ -50,42 +50,31 @@ Symbols/Function Pointers
::
+ %pS versatile_init+0x0/0x110
+ %ps versatile_init
%pF versatile_init+0x0/0x110
%pf versatile_init
- %pS versatile_init+0x0/0x110
%pSR versatile_init+0x9/0x110
(with __builtin_extract_return_addr() translation)
- %ps versatile_init
%pB prev_fn_of_versatile_init+0x88/0x88
-The ``F`` and ``f`` specifiers are for printing function pointers,
-for example, f->func, &gettimeofday. They have the same result as
-``S`` and ``s`` specifiers. But they do an extra conversion on
-ia64, ppc64 and parisc64 architectures where the function pointers
-are actually function descriptors.
+The ``S`` and ``s`` specifiers are used for printing a pointer in symbolic
+format. They result in the symbol name with (``S``) or without (``s``)
+offsets. If KALLSYMS are disabled then the symbol address is printed instead.
-The ``S`` and ``s`` specifiers can be used for printing symbols
-from direct addresses, for example, __builtin_return_address(0),
-(void *)regs->ip. They result in the symbol name with (``S``) or
-without (``s``) offsets. If KALLSYMS are disabled then the symbol
-address is printed instead.
+Note, that the ``F`` and ``f`` specifiers are identical to ``S`` (``s``)
+and thus deprecated. We have ``F`` and ``f`` because on ia64, ppc64 and
+parisc64 function pointers are indirect and, in fact, are function
+descriptors, which require additional dereferencing before we can lookup
+the symbol. As of now, ``S`` and ``s`` perform dereferencing on those
+platforms (when needed), so ``F`` and ``f`` exist for compatibility
+reasons only.
The ``B`` specifier results in the symbol name with offsets and should be
used when printing stack backtraces. The specifier takes into
consideration the effect of compiler optimisations which may occur
when tail-call``s are used and marked with the noreturn GCC attribute.
-Examples::
-
- printk("Going to call: %pF\n", gettimeofday);
- printk("Going to call: %pF\n", p->func);
- printk("%s: called from %pS\n", __func__, (void *)_RET_IP_);
- printk("%s: called from %pS\n", __func__,
- (void *)__builtin_return_address(0));
- printk("Faulted at %pS\n", (void *)regs->ip);
- printk(" %s%pB\n", (reliable ? "" : "? "), (void *)*stack);
-
-
Kernel Pointers
===============
diff --git a/include/linux/kallsyms.h b/include/linux/kallsyms.h
index 708f337d780b..e4f2e5a65f14 100644
--- a/include/linux/kallsyms.h
+++ b/include/linux/kallsyms.h
@@ -9,6 +9,10 @@
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/stddef.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+
+#include <asm/sections.h>
#define KSYM_NAME_LEN 128
#define KSYM_SYMBOL_LEN (sizeof("%s+%#lx/%#lx [%s]") + (KSYM_NAME_LEN - 1) + \
@@ -22,6 +26,56 @@
struct module;
+static inline int is_kernel_inittext(unsigned long addr)
+{
+ if (addr >= (unsigned long)_sinittext
+ && addr <= (unsigned long)_einittext)
+ return 1;
+ return 0;
+}
+
+static inline int is_kernel_text(unsigned long addr)
+{
+ if ((addr >= (unsigned long)_stext && addr <= (unsigned long)_etext) ||
+ arch_is_kernel_text(addr))
+ return 1;
+ return in_gate_area_no_mm(addr);
+}
+
+static inline int is_kernel(unsigned long addr)
+{
+ if (addr >= (unsigned long)_stext && addr <= (unsigned long)_end)
+ return 1;
+ return in_gate_area_no_mm(addr);
+}
+
+static inline int is_ksym_addr(unsigned long addr)
+{
+ if (IS_ENABLED(CONFIG_KALLSYMS_ALL))
+ return is_kernel(addr);
+
+ return is_kernel_text(addr) || is_kernel_inittext(addr);
+}
+
+static inline void *dereference_symbol_descriptor(void *ptr)
+{
+#ifdef HAVE_DEREFERENCE_FUNCTION_DESCRIPTOR
+ struct module *mod;
+
+ ptr = dereference_kernel_function_descriptor(ptr);
+ if (is_ksym_addr((unsigned long)ptr))
+ return ptr;
+
+ preempt_disable();
+ mod = __module_address((unsigned long)ptr);
+ preempt_enable();
+
+ if (mod)
+ ptr = dereference_module_function_descriptor(mod, ptr);
+#endif
+ return ptr;
+}
+
#ifdef CONFIG_KALLSYMS
/* Lookup the address for a symbol. Returns 0 if not found. */
unsigned long kallsyms_lookup_name(const char *name);
diff --git a/kernel/kallsyms.c b/kernel/kallsyms.c
index 531ffa984bc2..0e4c0922908a 100644
--- a/kernel/kallsyms.c
+++ b/kernel/kallsyms.c
@@ -12,7 +12,6 @@
* compression (see scripts/kallsyms.c for a more complete description)
*/
#include <linux/kallsyms.h>
-#include <linux/module.h>
#include <linux/init.h>
#include <linux/seq_file.h>
#include <linux/fs.h>
@@ -20,15 +19,12 @@
#include <linux/err.h>
#include <linux/proc_fs.h>
#include <linux/sched.h> /* for cond_resched */
-#include <linux/mm.h>
#include <linux/ctype.h>
#include <linux/slab.h>
#include <linux/filter.h>
#include <linux/ftrace.h>
#include <linux/compiler.h>
-#include <asm/sections.h>
-
/*
* These will be re-linked against their real values
* during the second link stage.
@@ -52,37 +48,6 @@ extern const u16 kallsyms_token_index[] __weak;
extern const unsigned long kallsyms_markers[] __weak;
-static inline int is_kernel_inittext(unsigned long addr)
-{
- if (addr >= (unsigned long)_sinittext
- && addr <= (unsigned long)_einittext)
- return 1;
- return 0;
-}
-
-static inline int is_kernel_text(unsigned long addr)
-{
- if ((addr >= (unsigned long)_stext && addr <= (unsigned long)_etext) ||
- arch_is_kernel_text(addr))
- return 1;
- return in_gate_area_no_mm(addr);
-}
-
-static inline int is_kernel(unsigned long addr)
-{
- if (addr >= (unsigned long)_stext && addr <= (unsigned long)_end)
- return 1;
- return in_gate_area_no_mm(addr);
-}
-
-static int is_ksym_addr(unsigned long addr)
-{
- if (IS_ENABLED(CONFIG_KALLSYMS_ALL))
- return is_kernel(addr);
-
- return is_kernel_text(addr) || is_kernel_inittext(addr);
-}
-
/*
* Expand a compressed symbol data into the resulting uncompressed string,
* if uncompressed string is too long (>= maxlen), it will be truncated,
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index 1746bae94d41..16e2eefb0f79 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -40,7 +40,6 @@
#include "../mm/internal.h" /* For the trace_print_flags arrays */
#include <asm/page.h> /* for PAGE_SIZE */
-#include <asm/sections.h> /* for dereference_function_descriptor() */
#include <asm/byteorder.h> /* cpu_to_le16 */
#include <linux/string_helpers.h>
@@ -1723,10 +1722,10 @@ char *pointer(const char *fmt, char *buf, char *end, void *ptr,
switch (*fmt) {
case 'F':
case 'f':
- ptr = dereference_function_descriptor(ptr);
- /* Fallthrough */
case 'S':
case 's':
+ ptr = dereference_symbol_descriptor(ptr);
+ /* Fallthrough */
case 'B':
return symbol_string(buf, end, ptr, spec, fmt);
case 'R':