cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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ftrace.h (3582B)

      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#define HAVE_FUNCTION_GRAPH_RET_ADDR_PTR
     12
     13#ifndef __ASSEMBLY__
     14extern void _mcount(void);
     15
     16static inline unsigned long ftrace_call_adjust(unsigned long addr)
     17{
     18       /* relocation of mcount call site is the same as the address */
     19       return addr;
     20}
     21
     22unsigned long prepare_ftrace_return(unsigned long parent, unsigned long ip,
     23				    unsigned long sp);
     24
     25struct dyn_arch_ftrace {
     26	struct module *mod;
     27};
     28
     29#ifdef CONFIG_DYNAMIC_FTRACE_WITH_ARGS
     30struct ftrace_regs {
     31	struct pt_regs regs;
     32};
     33
     34static __always_inline struct pt_regs *arch_ftrace_get_regs(struct ftrace_regs *fregs)
     35{
     36	/* We clear regs.msr in ftrace_call */
     37	return fregs->regs.msr ? &fregs->regs : NULL;
     38}
     39
     40static __always_inline void ftrace_instruction_pointer_set(struct ftrace_regs *fregs,
     41							   unsigned long ip)
     42{
     43	regs_set_return_ip(&fregs->regs, ip);
     44}
     45
     46struct ftrace_ops;
     47
     48#define ftrace_graph_func ftrace_graph_func
     49void ftrace_graph_func(unsigned long ip, unsigned long parent_ip,
     50		       struct ftrace_ops *op, struct ftrace_regs *fregs);
     51#endif
     52#endif /* __ASSEMBLY__ */
     53
     54#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
     55#define ARCH_SUPPORTS_FTRACE_OPS 1
     56#endif
     57#endif /* CONFIG_FUNCTION_TRACER */
     58
     59#ifndef __ASSEMBLY__
     60#ifdef CONFIG_FTRACE_SYSCALLS
     61/*
     62 * Some syscall entry functions on powerpc start with "ppc_" (fork and clone,
     63 * for instance) or ppc32_/ppc64_. We should also match the sys_ variant with
     64 * those.
     65 */
     66#define ARCH_HAS_SYSCALL_MATCH_SYM_NAME
     67#ifdef CONFIG_PPC64_ELF_ABI_V1
     68static inline bool arch_syscall_match_sym_name(const char *sym, const char *name)
     69{
     70	/* We need to skip past the initial dot, and the __se_sys alias */
     71	return !strcmp(sym + 1, name) ||
     72		(!strncmp(sym, ".__se_sys", 9) && !strcmp(sym + 6, name)) ||
     73		(!strncmp(sym, ".ppc_", 5) && !strcmp(sym + 5, name + 4)) ||
     74		(!strncmp(sym, ".ppc32_", 7) && !strcmp(sym + 7, name + 4)) ||
     75		(!strncmp(sym, ".ppc64_", 7) && !strcmp(sym + 7, name + 4));
     76}
     77#else
     78static inline bool arch_syscall_match_sym_name(const char *sym, const char *name)
     79{
     80	return !strcmp(sym, name) ||
     81		(!strncmp(sym, "__se_sys", 8) && !strcmp(sym + 5, name)) ||
     82		(!strncmp(sym, "ppc_", 4) && !strcmp(sym + 4, name + 4)) ||
     83		(!strncmp(sym, "ppc32_", 6) && !strcmp(sym + 6, name + 4)) ||
     84		(!strncmp(sym, "ppc64_", 6) && !strcmp(sym + 6, name + 4));
     85}
     86#endif /* CONFIG_PPC64_ELF_ABI_V1 */
     87#endif /* CONFIG_FTRACE_SYSCALLS */
     88
     89#if defined(CONFIG_PPC64) && defined(CONFIG_FUNCTION_TRACER)
     90#include <asm/paca.h>
     91
     92static inline void this_cpu_disable_ftrace(void)
     93{
     94	get_paca()->ftrace_enabled = 0;
     95}
     96
     97static inline void this_cpu_enable_ftrace(void)
     98{
     99	get_paca()->ftrace_enabled = 1;
    100}
    101
    102/* Disable ftrace on this CPU if possible (may not be implemented) */
    103static inline void this_cpu_set_ftrace_enabled(u8 ftrace_enabled)
    104{
    105	get_paca()->ftrace_enabled = ftrace_enabled;
    106}
    107
    108static inline u8 this_cpu_get_ftrace_enabled(void)
    109{
    110	return get_paca()->ftrace_enabled;
    111}
    112
    113void ftrace_free_init_tramp(void);
    114#else /* CONFIG_PPC64 */
    115static inline void this_cpu_disable_ftrace(void) { }
    116static inline void this_cpu_enable_ftrace(void) { }
    117static inline void this_cpu_set_ftrace_enabled(u8 ftrace_enabled) { }
    118static inline u8 this_cpu_get_ftrace_enabled(void) { return 1; }
    119static inline void ftrace_free_init_tramp(void) { }
    120#endif /* CONFIG_PPC64 */
    121#endif /* !__ASSEMBLY__ */
    122
    123#endif /* _ASM_POWERPC_FTRACE */