mwave: ioctl BKL pushdown

[linux-2.6-omap-h63xx.git] / lib / vsprintf.c

diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index f569feb7662e3d70f3c5dfae547df979a00d0608..1dc2d1d18fa8fddb9887dad750461d9f63faeb6f 100644 (file)
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -22,6 +22,8 @@
 #include <linux/string.h>
 #include <linux/ctype.h>
 #include <linux/kernel.h>
+#include <linux/kallsyms.h>
+#include <linux/uaccess.h>
 
 #include <asm/page.h>          /* for PAGE_SIZE */
 #include <asm/div64.h>
@@ -511,8 +513,52 @@ static char *string(char *buf, char *end, char *s, int field_width, int precisio
        return buf;
 }
 
-static char *pointer(char *buf, char *end, void *ptr, int field_width, int precision, int flags)
+static inline void *dereference_function_descriptor(void *ptr)
 {
+#if defined(CONFIG_IA64) || defined(CONFIG_PPC64)
+       void *p;
+       if (!probe_kernel_address(ptr, p))
+               ptr = p;
+#endif
+       return ptr;
+}
+
+static char *symbol_string(char *buf, char *end, void *ptr, int field_width, int precision, int flags)
+{
+       unsigned long value = (unsigned long) ptr;
+#ifdef CONFIG_KALLSYMS
+       char sym[KSYM_SYMBOL_LEN];
+       sprint_symbol(sym, value);
+       return string(buf, end, sym, field_width, precision, flags);
+#else
+       field_width = 2*sizeof(void *);
+       flags |= SPECIAL | SMALL | ZEROPAD;
+       return number(buf, end, value, 16, field_width, precision, flags);
+#endif
+}
+
+/*
+ * Show a '%p' thing.  A kernel extension is that the '%p' is followed
+ * by an extra set of alphanumeric characters that are extended format
+ * specifiers.
+ *
+ * Right now we just handle 'F' (for symbolic Function descriptor pointers)
+ * and 'S' (for Symbolic direct pointers), but this can easily be
+ * extended in the future (network address types etc).
+ *
+ * The difference between 'S' and 'F' is that on ia64 and ppc64 function
+ * pointers are really function descriptors, which contain a pointer the
+ * real address. 
+ */
+static char *pointer(const char *fmt, char *buf, char *end, void *ptr, int field_width, int precision, int flags)
+{
+       switch (*fmt) {
+       case 'F':
+               ptr = dereference_function_descriptor(ptr);
+               /* Fallthrough */
+       case 'S':
+               return symbol_string(buf, end, ptr, field_width, precision, flags);
+       }
        flags |= SMALL;
        if (field_width == -1) {
                field_width = 2*sizeof(void *);
@@ -663,7 +709,12 @@ int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
                                continue;
 
                        case 'p':
-                               str = pointer(str, end, va_arg(args, void *), field_width, precision, flags);
+                               str = pointer(fmt+1, str, end,
+                                               va_arg(args, void *),
+                                               field_width, precision, flags);
+                               /* Skip all alphanumeric pointer suffixes */
+                               while (isalnum(fmt[1]))
+                                       fmt++;
                                continue;
 
                        case 'n':