arch/sparc/kernel/jump_label.c

   1 #include <linux/kernel.h>
   2 #include <linux/types.h>
   3 #include <linux/mutex.h>
   4 #include <linux/cpu.h>
   5
   6 #include <linux/jump_label.h>
   7 #include <linux/memory.h>
   8
   9 #ifdef HAVE_JUMP_LABEL
  10
  11 void arch_jump_label_transform(struct jump_entry *entry,
  12                                enum jump_label_type type)
  13 {
  14         u32 val;
  15         u32 *insn = (u32 *) (unsigned long) entry->code;
  16
  17         if (type == JUMP_LABEL_ENABLE) {
  18                 s32 off = (s32)entry->target - (s32)entry->code;
  19
  20 #ifdef CONFIG_SPARC64
  21                 /* ba,pt %xcc, . + (off << 2) */
  22                 val = 0x10680000 | ((u32) off >> 2);
  23 #else
  24                 /* ba . + (off << 2) */
  25                 val = 0x10800000 | ((u32) off >> 2);
  26 #endif
  27         } else {
  28                 val = 0x01000000;
  29         }
  30
  31         get_online_cpus();
  32         mutex_lock(&text_mutex);
  33         *insn = val;
  34         flushi(insn);
  35         mutex_unlock(&text_mutex);
  36         put_online_cpus();
  37 }
  38
  39 void arch_jump_label_text_poke_early(jump_label_t addr)
  40 {
  41         u32 *insn_p = (u32 *) (unsigned long) addr;
  42
  43         *insn_p = 0x01000000;
  44         flushi(insn_p);
  45 }
  46
  47 #endif