[v2,2/5] symbols: split symbols_num_syms

Commit Message

Jan Beulich April 2, 2025, 1:58 p.m. UTC

In preparation for inserting address entries into symbols_addresses[] /
symbols_offsets[] without enlarging symbols_sorted_offsets[], split
symbols_num_syms into symbols_num_addrs (counting entries in the former
plus symbols_names[] as well as, less directly, symbols_markers[]) and
symbols_num_names (counting entries in the latter).

While doing the adjustment move declarations to a new private symbols.h,
to be used by both symbols.c and symbols-dummy.c. Replace u8/u16 while
doing so.

Signed-off-by: Jan Beulich <[e-mail]>
Acked-by: Andrew Cooper <[e-mail]>

Patch

--- a/xen/common/symbols.c
+++ b/xen/common/symbols.c
@@ -10,7 +10,6 @@ 
  *      compression (see tools/symbols.c for a more complete description)
  */
 
-#include <xen/symbols.h>
 #include <xen/kernel.h>
 #include <xen/init.h>
 #include <xen/lib.h>
@@ -21,22 +20,7 @@ 
 #include <xen/guest_access.h>
 #include <xen/errno.h>
 
-#ifdef SYMBOLS_ORIGIN
-extern const unsigned int symbols_offsets[];
-#define symbols_address(n) (SYMBOLS_ORIGIN + symbols_offsets[n])
-#else
-extern const unsigned long symbols_addresses[];
-#define symbols_address(n) symbols_addresses[n]
-#endif
-extern const unsigned int symbols_num_syms;
-extern const u8 symbols_names[];
-
-extern const struct symbol_offset symbols_sorted_offsets[];
-
-extern const u8 symbols_token_table[];
-extern const u16 symbols_token_index[];
-
-extern const unsigned int symbols_markers[];
+#include "symbols.h"
 
 /* expand a compressed symbol data into the resulting uncompressed string,
    given the offset to where the symbol is in the compressed stream */
@@ -124,7 +108,7 @@  const char *symbols_lookup(unsigned long
 
         /* do a binary search on the sorted symbols_addresses array */
     low = 0;
-    high = symbols_num_syms;
+    high = symbols_num_addrs;
 
     while (high-low > 1) {
         mid = (low + high) / 2;
@@ -141,7 +125,7 @@  const char *symbols_lookup(unsigned long
     symbols_expand_symbol(get_symbol_offset(low), namebuf);
 
     /* Search for next non-aliased symbol */
-    for (i = low + 1; i < symbols_num_syms; i++) {
+    for (i = low + 1; i < symbols_num_addrs; i++) {
         if (symbols_address(i) > symbols_address(low)) {
             symbol_end = symbols_address(i);
             break;
@@ -182,9 +166,9 @@  int xensyms_read(uint32_t *symnum, char
     static unsigned int next_symbol, next_offset;
     static DEFINE_SPINLOCK(symbols_mutex);
 
-    if ( *symnum > symbols_num_syms )
+    if ( *symnum > symbols_num_addrs )
         return -ERANGE;
-    if ( *symnum == symbols_num_syms )
+    if ( *symnum == symbols_num_addrs )
     {
         /* No more symbols */
         name[0] = '\0';
@@ -227,7 +211,7 @@  unsigned long symbols_lookup_by_name(con
 
 #ifdef CONFIG_FAST_SYMBOL_LOOKUP
     low = 0;
-    high = symbols_num_syms;
+    high = symbols_num_names;
     while ( low < high )
     {
         unsigned long mid = low + ((high - low) / 2);
--- /dev/null
+++ b/xen/common/symbols.h
@@ -0,0 +1,31 @@ 
+/* SPDX-License-Identifier: GPL-2.0-only */
+#include <xen/stdint.h>
+#include <xen/symbols.h>
+
+#ifdef SYMBOLS_ORIGIN
+extern const unsigned int symbols_offsets[];
+#define symbols_address(n) (SYMBOLS_ORIGIN + symbols_offsets[n])
+#else
+extern const unsigned long symbols_addresses[];
+#define symbols_address(n) symbols_addresses[n]
+#endif
+extern const unsigned int symbols_num_addrs;
+extern const unsigned char symbols_names[];
+
+extern const unsigned int symbols_num_names;
+extern const struct symbol_offset symbols_sorted_offsets[];
+
+extern const uint8_t symbols_token_table[];
+extern const uint16_t symbols_token_index[];
+
+extern const unsigned int symbols_markers[];
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
--- a/xen/common/symbols-dummy.c
+++ b/xen/common/symbols-dummy.c
@@ -3,22 +3,22 @@ 
  *                  link of the hypervisor image.
  */
 
-#include <xen/types.h>
-#include <xen/symbols.h>
+#include "symbols.h"
 
 #ifdef SYMBOLS_ORIGIN
 const unsigned int symbols_offsets[1];
 #else
 const unsigned long symbols_addresses[1];
 #endif
-const unsigned int symbols_num_syms;
-const u8 symbols_names[1];
+const unsigned int symbols_num_addrs;
+const unsigned char symbols_names[1];
 
 #ifdef CONFIG_FAST_SYMBOL_LOOKUP
+const unsigned int symbols_num_names;
 const struct symbol_offset symbols_sorted_offsets[1];
 #endif
 
-const u8 symbols_token_table[1];
-const u16 symbols_token_index[1];
+const uint8_t symbols_token_table[1];
+const uint16_t symbols_token_index[1];
 
 const unsigned int symbols_markers[1];
--- a/xen/tools/symbols.c
+++ b/xen/tools/symbols.c
@@ -323,7 +323,7 @@  static void write_src(void)
 	}
 	printf("\n");
 
-	output_label("symbols_num_syms");
+	output_label("symbols_num_addrs");
 	printf("\t.long\t%d\n", table_cnt);
 	printf("\n");
 
@@ -373,6 +373,10 @@  static void write_src(void)
 		return;
 	}
 
+	output_label("symbols_num_names");
+	printf("\t.long\t%d\n", table_cnt);
+	printf("\n");
+
 	/* Sorted by original symbol names and type. */
 	qsort(table, table_cnt, sizeof(*table), compare_name_orig);