arch/powerpc/include/asm/ftrace.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ASM_POWERPC_FTRACE
   3 #define _ASM_POWERPC_FTRACE
   4
   5 #include <asm/types.h>
   6
   7 #ifdef CONFIG_FUNCTION_TRACER
   8 #define MCOUNT_ADDR             ((unsigned long)(_mcount))
   9 #define MCOUNT_INSN_SIZE        4 /* sizeof mcount call */
  10
  11 #ifdef __ASSEMBLY__
  12
  13 /* Based off of objdump optput from glibc */
  14
  15 #define MCOUNT_SAVE_FRAME                       \
  16         stwu    r1,-48(r1);                     \
  17         stw     r3, 12(r1);                     \
  18         stw     r4, 16(r1);                     \
  19         stw     r5, 20(r1);                     \
  20         stw     r6, 24(r1);                     \
  21         mflr    r3;                             \
  22         lwz     r4, 52(r1);                     \
  23         mfcr    r5;                             \
  24         stw     r7, 28(r1);                     \
  25         stw     r8, 32(r1);                     \
  26         stw     r9, 36(r1);                     \
  27         stw     r10,40(r1);                     \
  28         stw     r3, 44(r1);                     \
  29         stw     r5, 8(r1)
  30
  31 #define MCOUNT_RESTORE_FRAME                    \
  32         lwz     r6, 8(r1);                      \
  33         lwz     r0, 44(r1);                     \
  34         lwz     r3, 12(r1);                     \
  35         mtctr   r0;                             \
  36         lwz     r4, 16(r1);                     \
  37         mtcr    r6;                             \
  38         lwz     r5, 20(r1);                     \
  39         lwz     r6, 24(r1);                     \
  40         lwz     r0, 52(r1);                     \
  41         lwz     r7, 28(r1);                     \
  42         lwz     r8, 32(r1);                     \
  43         mtlr    r0;                             \
  44         lwz     r9, 36(r1);                     \
  45         lwz     r10,40(r1);                     \
  46         addi    r1, r1, 48
  47
  48 #else /* !__ASSEMBLY__ */
  49 extern void _mcount(void);
  50
  51 #ifdef CONFIG_DYNAMIC_FTRACE
  52 # define FTRACE_ADDR ((unsigned long)ftrace_caller)
  53 # define FTRACE_REGS_ADDR FTRACE_ADDR
  54 static inline unsigned long ftrace_call_adjust(unsigned long addr)
  55 {
  56        /* reloction of mcount call site is the same as the address */
  57        return addr;
  58 }
  59
  60 struct dyn_arch_ftrace {
  61         struct module *mod;
  62 };
  63 #endif /*  CONFIG_DYNAMIC_FTRACE */
  64 #endif /* __ASSEMBLY__ */
  65
  66 #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
  67 #define ARCH_SUPPORTS_FTRACE_OPS 1
  68 #endif
  69 #endif
  70
  71 #if defined(CONFIG_FTRACE_SYSCALLS) && !defined(__ASSEMBLY__)
  72 #ifdef PPC64_ELF_ABI_v1
  73 #define ARCH_HAS_SYSCALL_MATCH_SYM_NAME
  74 static inline bool arch_syscall_match_sym_name(const char *sym, const char *name)
  75 {
  76         /*
  77          * Compare the symbol name with the system call name. Skip the .sys or .SyS
  78          * prefix from the symbol name and the sys prefix from the system call name and
  79          * just match the rest. This is only needed on ppc64 since symbol names on
  80          * 32bit do not start with a period so the generic function will work.
  81          */
  82         return !strcmp(sym + 4, name + 3);
  83 }
  84 #endif
  85 #endif /* CONFIG_FTRACE_SYSCALLS && !__ASSEMBLY__ */
  86
  87 #endif /* _ASM_POWERPC_FTRACE */