tools/perf/arch/arm64/util/machine.c

   1 // SPDX-License-Identifier: GPL-2.0
   2
   3 #include <stdio.h>
   4 #include <string.h>
   5 #include "debug.h"
   6 #include "symbol.h"
   7
   8 /* On arm64, kernel text segment start at high memory address,
   9  * for example 0xffff 0000 8xxx xxxx. Modules start at a low memory
  10  * address, like 0xffff 0000 00ax xxxx. When only samll amount of
  11  * memory is used by modules, gap between end of module's text segment
  12  * and start of kernel text segment may be reach 2G.
  13  * Therefore do not fill this gap and do not assign it to the kernel dso map.
  14  */
  15
  16 #define SYMBOL_LIMIT (1 << 12) /* 4K */
  17
  18 void arch__symbols__fixup_end(struct symbol *p, struct symbol *c)
  19 {
  20         if ((strchr(p->name, '[') && strchr(c->name, '[') == NULL) ||
  21                         (strchr(p->name, '[') == NULL && strchr(c->name, '[')))
  22                 /* Limit range of last symbol in module and kernel */
  23                 p->end += SYMBOL_LIMIT;
  24         else
  25                 p->end = c->start;
  26         pr_debug4("%s sym:%s end:%#lx\n", __func__, p->name, p->end);
  27 }