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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_POWERPC_FTRACE
#define _ASM_POWERPC_FTRACE
#include <asm/types.h>
#ifdef CONFIG_FUNCTION_TRACER
#define MCOUNT_ADDR ((unsigned long)(_mcount))
#define MCOUNT_INSN_SIZE 4 /* sizeof mcount call */
/* Ignore unused weak functions which will have larger offsets */
#if defined(CONFIG_MPROFILE_KERNEL) || defined(CONFIG_ARCH_USING_PATCHABLE_FUNCTION_ENTRY)
#define FTRACE_MCOUNT_MAX_OFFSET 16
#elif defined(CONFIG_PPC32)
#define FTRACE_MCOUNT_MAX_OFFSET 8
#endif
#ifndef __ASSEMBLER__
extern void _mcount(void);
unsigned long prepare_ftrace_return(unsigned long parent, unsigned long ip,
unsigned long sp);
struct module;
struct dyn_ftrace;
struct dyn_arch_ftrace {
#ifdef CONFIG_PPC_FTRACE_OUT_OF_LINE
/* pointer to the associated out-of-line stub */
unsigned long ool_stub;
#endif
};
#ifdef CONFIG_DYNAMIC_FTRACE_WITH_ARGS
#define ftrace_need_init_nop() (true)
int ftrace_init_nop(struct module *mod, struct dyn_ftrace *rec);
#define ftrace_init_nop ftrace_init_nop
#include <linux/ftrace_regs.h>
static __always_inline struct pt_regs *arch_ftrace_get_regs(struct ftrace_regs *fregs)
{
/* We clear regs.msr in ftrace_call */
return arch_ftrace_regs(fregs)->regs.msr ? &arch_ftrace_regs(fregs)->regs : NULL;
}
#define arch_ftrace_fill_perf_regs(fregs, _regs) do { \
(_regs)->result = 0; \
(_regs)->nip = arch_ftrace_regs(fregs)->regs.nip; \
(_regs)->gpr[1] = arch_ftrace_regs(fregs)->regs.gpr[1]; \
asm volatile("mfmsr %0" : "=r" ((_regs)->msr)); \
} while (0)
#undef ftrace_regs_get_return_value
static __always_inline unsigned long
ftrace_regs_get_return_value(const struct ftrace_regs *fregs)
{
return arch_ftrace_regs(fregs)->regs.gpr[3];
}
#define ftrace_regs_get_return_value ftrace_regs_get_return_value
#undef ftrace_regs_get_frame_pointer
static __always_inline unsigned long
ftrace_regs_get_frame_pointer(const struct ftrace_regs *fregs)
{
return arch_ftrace_regs(fregs)->regs.gpr[1];
}
static __always_inline void
ftrace_regs_set_instruction_pointer(struct ftrace_regs *fregs,
unsigned long ip)
{
regs_set_return_ip(&arch_ftrace_regs(fregs)->regs, ip);
}
static __always_inline unsigned long
ftrace_regs_get_return_address(struct ftrace_regs *fregs)
{
return arch_ftrace_regs(fregs)->regs.link;
}
struct ftrace_ops;
#define ftrace_graph_func ftrace_graph_func
void ftrace_graph_func(unsigned long ip, unsigned long parent_ip,
struct ftrace_ops *op, struct ftrace_regs *fregs);
#endif
#endif /* __ASSEMBLER__ */
#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
#define ARCH_SUPPORTS_FTRACE_OPS 1
#endif
#endif /* CONFIG_FUNCTION_TRACER */
#ifndef __ASSEMBLER__
#ifdef CONFIG_FTRACE_SYSCALLS
/*
* Some syscall entry functions on powerpc start with "ppc_" (fork and clone,
* for instance) or ppc32_/ppc64_. We should also match the sys_ variant with
* those.
*/
#define ARCH_HAS_SYSCALL_MATCH_SYM_NAME
static inline bool arch_syscall_match_sym_name(const char *sym, const char *name)
{
return !strcmp(sym, name) ||
(!strncmp(sym, "__se_sys", 8) && !strcmp(sym + 5, name)) ||
(!strncmp(sym, "ppc_", 4) && !strcmp(sym + 4, name + 4)) ||
(!strncmp(sym, "ppc32_", 6) && !strcmp(sym + 6, name + 4)) ||
(!strncmp(sym, "ppc64_", 6) && !strcmp(sym + 6, name + 4));
}
#endif /* CONFIG_FTRACE_SYSCALLS */
#if defined(CONFIG_PPC64) && defined(CONFIG_FUNCTION_TRACER)
#include <asm/paca.h>
static inline void this_cpu_disable_ftrace(void)
{
get_paca()->ftrace_enabled = 0;
}
static inline void this_cpu_enable_ftrace(void)
{
get_paca()->ftrace_enabled = 1;
}
/* Disable ftrace on this CPU if possible (may not be implemented) */
static inline void this_cpu_set_ftrace_enabled(u8 ftrace_enabled)
{
get_paca()->ftrace_enabled = ftrace_enabled;
}
static inline u8 this_cpu_get_ftrace_enabled(void)
{
return get_paca()->ftrace_enabled;
}
#else /* CONFIG_PPC64 */
static inline void this_cpu_disable_ftrace(void) { }
static inline void this_cpu_enable_ftrace(void) { }
static inline void this_cpu_set_ftrace_enabled(u8 ftrace_enabled) { }
static inline u8 this_cpu_get_ftrace_enabled(void) { return 1; }
#endif /* CONFIG_PPC64 */
#ifdef CONFIG_FUNCTION_TRACER
extern unsigned int ftrace_tramp_text[], ftrace_tramp_init[];
#ifdef CONFIG_PPC_FTRACE_OUT_OF_LINE
struct ftrace_ool_stub {
#ifdef CONFIG_DYNAMIC_FTRACE_WITH_CALL_OPS
struct ftrace_ops *ftrace_op;
#endif
u32 insn[4];
} __aligned(sizeof(unsigned long));
extern struct ftrace_ool_stub ftrace_ool_stub_text_end[], ftrace_ool_stub_text[],
ftrace_ool_stub_inittext[];
extern unsigned int ftrace_ool_stub_text_end_count, ftrace_ool_stub_text_count,
ftrace_ool_stub_inittext_count;
#endif
void ftrace_free_init_tramp(void);
unsigned long ftrace_call_adjust(unsigned long addr);
#ifdef CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS
/*
* When an ftrace registered caller is tracing a function that is also set by a
* register_ftrace_direct() call, it needs to be differentiated in the
* ftrace_caller trampoline so that the direct call can be invoked after the
* other ftrace ops. To do this, place the direct caller in the orig_gpr3 field
* of pt_regs. This tells ftrace_caller that there's a direct caller.
*/
static inline void arch_ftrace_set_direct_caller(struct ftrace_regs *fregs, unsigned long addr)
{
struct pt_regs *regs = &arch_ftrace_regs(fregs)->regs;
regs->orig_gpr3 = addr;
}
#endif /* CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS */
#else
static inline void ftrace_free_init_tramp(void) { }
static inline unsigned long ftrace_call_adjust(unsigned long addr) { return addr; }
#endif
#endif /* !__ASSEMBLER__ */
#endif /* _ASM_POWERPC_FTRACE */
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