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Diffstat (limited to 'arch/riscv/include/asm/ftrace.h')
-rw-r--r--arch/riscv/include/asm/ftrace.h193
1 files changed, 178 insertions, 15 deletions
diff --git a/arch/riscv/include/asm/ftrace.h b/arch/riscv/include/asm/ftrace.h
index ace8a6e2d11d..d627f63ee289 100644
--- a/arch/riscv/include/asm/ftrace.h
+++ b/arch/riscv/include/asm/ftrace.h
@@ -11,16 +11,41 @@
#if defined(CONFIG_FUNCTION_GRAPH_TRACER) && defined(CONFIG_FRAME_POINTER)
#define HAVE_FUNCTION_GRAPH_FP_TEST
#endif
-#define HAVE_FUNCTION_GRAPH_RET_ADDR_PTR
#define ARCH_SUPPORTS_FTRACE_OPS 1
#ifndef __ASSEMBLY__
+
+extern void *return_address(unsigned int level);
+
+#define ftrace_return_address(n) return_address(n)
+
void _mcount(void);
static inline unsigned long ftrace_call_adjust(unsigned long addr)
{
return addr;
}
+/*
+ * Let's do like x86/arm64 and ignore the compat syscalls.
+ */
+#define ARCH_TRACE_IGNORE_COMPAT_SYSCALLS
+static inline bool arch_trace_is_compat_syscall(struct pt_regs *regs)
+{
+ return is_compat_task();
+}
+
+#define ARCH_HAS_SYSCALL_MATCH_SYM_NAME
+static inline bool arch_syscall_match_sym_name(const char *sym,
+ const char *name)
+{
+ /*
+ * Since all syscall functions have __riscv_ prefix, we must skip it.
+ * However, as we described above, we decided to ignore compat
+ * syscalls, so we don't care about __riscv_compat_ prefix here.
+ */
+ return !strcmp(sym + 8, name);
+}
+
struct dyn_arch_ftrace {
};
#endif
@@ -32,6 +57,14 @@ struct dyn_arch_ftrace {
* 2) jalr: setting low-12 offset to ra, jump to ra, and set ra to
* return address (original pc + 4)
*
+ *<ftrace enable>:
+ * 0: auipc t0/ra, 0x?
+ * 4: jalr t0/ra, ?(t0/ra)
+ *
+ *<ftrace disable>:
+ * 0: nop
+ * 4: nop
+ *
* Dynamic ftrace generates probes to call sites, so we must deal with
* both auipc and jalr at the same time.
*/
@@ -42,30 +75,160 @@ struct dyn_arch_ftrace {
#define AUIPC_OFFSET_MASK (0xfffff000)
#define AUIPC_PAD (0x00001000)
#define JALR_SHIFT 20
-#define JALR_BASIC (0x000080e7)
-#define AUIPC_BASIC (0x00000097)
-#define NOP4 (0x00000013)
+#define JALR_RA (0x000080e7)
+#define AUIPC_RA (0x00000097)
+#define JALR_T0 (0x000282e7)
+#define AUIPC_T0 (0x00000297)
+
+#define to_jalr_t0(offset) \
+ (((offset & JALR_OFFSET_MASK) << JALR_SHIFT) | JALR_T0)
+
+#define to_auipc_t0(offset) \
+ ((offset & JALR_SIGN_MASK) ? \
+ (((offset & AUIPC_OFFSET_MASK) + AUIPC_PAD) | AUIPC_T0) : \
+ ((offset & AUIPC_OFFSET_MASK) | AUIPC_T0))
-#define make_call(caller, callee, call) \
+#define make_call_t0(caller, callee, call) \
do { \
- call[0] = to_auipc_insn((unsigned int)((unsigned long)callee - \
- (unsigned long)caller)); \
- call[1] = to_jalr_insn((unsigned int)((unsigned long)callee - \
- (unsigned long)caller)); \
+ unsigned int offset = \
+ (unsigned long) (callee) - (unsigned long) (caller); \
+ call[0] = to_auipc_t0(offset); \
+ call[1] = to_jalr_t0(offset); \
} while (0)
-#define to_jalr_insn(offset) \
- (((offset & JALR_OFFSET_MASK) << JALR_SHIFT) | JALR_BASIC)
+#define to_jalr_ra(offset) \
+ (((offset & JALR_OFFSET_MASK) << JALR_SHIFT) | JALR_RA)
-#define to_auipc_insn(offset) \
+#define to_auipc_ra(offset) \
((offset & JALR_SIGN_MASK) ? \
- (((offset & AUIPC_OFFSET_MASK) + AUIPC_PAD) | AUIPC_BASIC) : \
- ((offset & AUIPC_OFFSET_MASK) | AUIPC_BASIC))
+ (((offset & AUIPC_OFFSET_MASK) + AUIPC_PAD) | AUIPC_RA) : \
+ ((offset & AUIPC_OFFSET_MASK) | AUIPC_RA))
+
+#define make_call_ra(caller, callee, call) \
+do { \
+ unsigned int offset = \
+ (unsigned long) (callee) - (unsigned long) (caller); \
+ call[0] = to_auipc_ra(offset); \
+ call[1] = to_jalr_ra(offset); \
+} while (0)
/*
* Let auipc+jalr be the basic *mcount unit*, so we make it 8 bytes here.
*/
#define MCOUNT_INSN_SIZE 8
-#endif
+
+#ifndef __ASSEMBLY__
+struct dyn_ftrace;
+int ftrace_init_nop(struct module *mod, struct dyn_ftrace *rec);
+#define ftrace_init_nop ftrace_init_nop
+
+#ifdef CONFIG_DYNAMIC_FTRACE_WITH_ARGS
+#define arch_ftrace_get_regs(regs) NULL
+#define HAVE_ARCH_FTRACE_REGS
+struct ftrace_ops;
+struct ftrace_regs;
+#define arch_ftrace_regs(fregs) ((struct __arch_ftrace_regs *)(fregs))
+
+struct __arch_ftrace_regs {
+ unsigned long epc;
+ unsigned long ra;
+ unsigned long sp;
+ unsigned long s0;
+ unsigned long t1;
+ union {
+ unsigned long args[8];
+ struct {
+ unsigned long a0;
+ unsigned long a1;
+ unsigned long a2;
+ unsigned long a3;
+ unsigned long a4;
+ unsigned long a5;
+ unsigned long a6;
+ unsigned long a7;
+ };
+ };
+};
+
+static __always_inline unsigned long ftrace_regs_get_instruction_pointer(const struct ftrace_regs
+ *fregs)
+{
+ return arch_ftrace_regs(fregs)->epc;
+}
+
+static __always_inline void ftrace_regs_set_instruction_pointer(struct ftrace_regs *fregs,
+ unsigned long pc)
+{
+ arch_ftrace_regs(fregs)->epc = pc;
+}
+
+static __always_inline unsigned long ftrace_regs_get_stack_pointer(const struct ftrace_regs *fregs)
+{
+ return arch_ftrace_regs(fregs)->sp;
+}
+
+static __always_inline unsigned long ftrace_regs_get_frame_pointer(const struct ftrace_regs *fregs)
+{
+ return arch_ftrace_regs(fregs)->s0;
+}
+
+static __always_inline unsigned long ftrace_regs_get_argument(struct ftrace_regs *fregs,
+ unsigned int n)
+{
+ if (n < 8)
+ return arch_ftrace_regs(fregs)->args[n];
+ return 0;
+}
+
+static __always_inline unsigned long ftrace_regs_get_return_value(const struct ftrace_regs *fregs)
+{
+ return arch_ftrace_regs(fregs)->a0;
+}
+
+static __always_inline unsigned long ftrace_regs_get_return_address(const struct ftrace_regs *fregs)
+{
+ return arch_ftrace_regs(fregs)->ra;
+}
+
+static __always_inline void ftrace_regs_set_return_value(struct ftrace_regs *fregs,
+ unsigned long ret)
+{
+ arch_ftrace_regs(fregs)->a0 = ret;
+}
+
+static __always_inline void ftrace_override_function_with_return(struct ftrace_regs *fregs)
+{
+ arch_ftrace_regs(fregs)->epc = arch_ftrace_regs(fregs)->ra;
+}
+
+static __always_inline struct pt_regs *
+ftrace_partial_regs(const struct ftrace_regs *fregs, struct pt_regs *regs)
+{
+ struct __arch_ftrace_regs *afregs = arch_ftrace_regs(fregs);
+
+ memcpy(&regs->a_regs, afregs->args, sizeof(afregs->args));
+ regs->epc = afregs->epc;
+ regs->ra = afregs->ra;
+ regs->sp = afregs->sp;
+ regs->s0 = afregs->s0;
+ regs->t1 = afregs->t1;
+ return regs;
+}
+
+int ftrace_regs_query_register_offset(const char *name);
+
+void ftrace_graph_func(unsigned long ip, unsigned long parent_ip,
+ struct ftrace_ops *op, struct ftrace_regs *fregs);
+#define ftrace_graph_func ftrace_graph_func
+
+static inline void arch_ftrace_set_direct_caller(struct ftrace_regs *fregs, unsigned long addr)
+{
+ arch_ftrace_regs(fregs)->t1 = addr;
+}
+#endif /* CONFIG_DYNAMIC_FTRACE_WITH_ARGS */
+
+#endif /* __ASSEMBLY__ */
+
+#endif /* CONFIG_DYNAMIC_FTRACE */
#endif /* _ASM_RISCV_FTRACE_H */