diff options
Diffstat (limited to 'include/asm-powerpc/kprobes.h')
| -rw-r--r-- | include/asm-powerpc/kprobes.h | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/include/asm-powerpc/kprobes.h b/include/asm-powerpc/kprobes.h index 34e1f89a5fa02..2dafa376a63f6 100644 --- a/include/asm-powerpc/kprobes.h +++ b/include/asm-powerpc/kprobes.h @@ -44,6 +44,28 @@ typedef unsigned int kprobe_opcode_t; #define IS_TDI(instr) (((instr) & 0xfc000000) == 0x08000000) #define IS_TWI(instr) (((instr) & 0xfc000000) == 0x0c000000) +/* + * 64bit powerpc uses function descriptors. + * Handle cases where: + * - User passes a <.symbol> or <module:.symbol> + * - User passes a <symbol> or <module:symbol> + * - User passes a non-existant symbol, kallsyms_lookup_name + * returns 0. Don't deref the NULL pointer in that case + */ +#define kprobe_lookup_name(name, addr) \ +{ \ + addr = (kprobe_opcode_t *)kallsyms_lookup_name(name); \ + if (addr) { \ + char *colon; \ + if ((colon = strchr(name, ':')) != NULL) { \ + colon++; \ + if (*colon != '\0' && *colon != '.') \ + addr = *(kprobe_opcode_t **)addr; \ + } else if (name[0] != '.') \ + addr = *(kprobe_opcode_t **)addr; \ + } \ +} + #define JPROBE_ENTRY(pentry) (kprobe_opcode_t *)((func_descr_t *)pentry) #define is_trap(instr) (IS_TW(instr) || IS_TD(instr) || \ |