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-rw-r--r--arch/nds32/kernel/ftrace.c278
1 files changed, 0 insertions, 278 deletions
diff --git a/arch/nds32/kernel/ftrace.c b/arch/nds32/kernel/ftrace.c
deleted file mode 100644
index 711bc8cd186d..000000000000
--- a/arch/nds32/kernel/ftrace.c
+++ /dev/null
@@ -1,278 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-
-#include <linux/ftrace.h>
-#include <linux/uaccess.h>
-#include <asm/cacheflush.h>
-
-#ifndef CONFIG_DYNAMIC_FTRACE
-extern void (*ftrace_trace_function)(unsigned long, unsigned long,
- struct ftrace_ops*, struct ftrace_regs*);
-extern void ftrace_graph_caller(void);
-
-noinline void __naked ftrace_stub(unsigned long ip, unsigned long parent_ip,
- struct ftrace_ops *op, struct ftrace_regs *fregs)
-{
- __asm__ (""); /* avoid to optimize as pure function */
-}
-
-noinline void _mcount(unsigned long parent_ip)
-{
- /* save all state by the compiler prologue */
-
- unsigned long ip = (unsigned long)__builtin_return_address(0);
-
- if (ftrace_trace_function != ftrace_stub)
- ftrace_trace_function(ip - MCOUNT_INSN_SIZE, parent_ip,
- NULL, NULL);
-
-#ifdef CONFIG_FUNCTION_GRAPH_TRACER
- if (ftrace_graph_return != (trace_func_graph_ret_t)ftrace_stub
- || ftrace_graph_entry != ftrace_graph_entry_stub)
- ftrace_graph_caller();
-#endif
-
- /* restore all state by the compiler epilogue */
-}
-EXPORT_SYMBOL(_mcount);
-
-#else /* CONFIG_DYNAMIC_FTRACE */
-
-noinline void __naked ftrace_stub(unsigned long ip, unsigned long parent_ip,
- struct ftrace_ops *op, struct ftrace_regs *fregs)
-{
- __asm__ (""); /* avoid to optimize as pure function */
-}
-
-noinline void __naked _mcount(unsigned long parent_ip)
-{
- __asm__ (""); /* avoid to optimize as pure function */
-}
-EXPORT_SYMBOL(_mcount);
-
-#define XSTR(s) STR(s)
-#define STR(s) #s
-void _ftrace_caller(unsigned long parent_ip)
-{
- /* save all state needed by the compiler prologue */
-
- /*
- * prepare arguments for real tracing function
- * first arg : __builtin_return_address(0) - MCOUNT_INSN_SIZE
- * second arg : parent_ip
- */
- __asm__ __volatile__ (
- "move $r1, %0 \n\t"
- "addi $r0, %1, #-" XSTR(MCOUNT_INSN_SIZE) "\n\t"
- :
- : "r" (parent_ip), "r" (__builtin_return_address(0)));
-
- /* a placeholder for the call to a real tracing function */
- __asm__ __volatile__ (
- "ftrace_call: \n\t"
- "nop \n\t"
- "nop \n\t"
- "nop \n\t");
-
-#ifdef CONFIG_FUNCTION_GRAPH_TRACER
- /* a placeholder for the call to ftrace_graph_caller */
- __asm__ __volatile__ (
- "ftrace_graph_call: \n\t"
- "nop \n\t"
- "nop \n\t"
- "nop \n\t");
-#endif
- /* restore all state needed by the compiler epilogue */
-}
-
-static unsigned long gen_sethi_insn(unsigned long addr)
-{
- unsigned long opcode = 0x46000000;
- unsigned long imm = addr >> 12;
- unsigned long rt_num = 0xf << 20;
-
- return ENDIAN_CONVERT(opcode | rt_num | imm);
-}
-
-static unsigned long gen_ori_insn(unsigned long addr)
-{
- unsigned long opcode = 0x58000000;
- unsigned long imm = addr & 0x0000fff;
- unsigned long rt_num = 0xf << 20;
- unsigned long ra_num = 0xf << 15;
-
- return ENDIAN_CONVERT(opcode | rt_num | ra_num | imm);
-}
-
-static unsigned long gen_jral_insn(unsigned long addr)
-{
- unsigned long opcode = 0x4a000001;
- unsigned long rt_num = 0x1e << 20;
- unsigned long rb_num = 0xf << 10;
-
- return ENDIAN_CONVERT(opcode | rt_num | rb_num);
-}
-
-static void ftrace_gen_call_insn(unsigned long *call_insns,
- unsigned long addr)
-{
- call_insns[0] = gen_sethi_insn(addr); /* sethi $r15, imm20u */
- call_insns[1] = gen_ori_insn(addr); /* ori $r15, $r15, imm15u */
- call_insns[2] = gen_jral_insn(addr); /* jral $lp, $r15 */
-}
-
-static int __ftrace_modify_code(unsigned long pc, unsigned long *old_insn,
- unsigned long *new_insn, bool validate)
-{
- unsigned long orig_insn[3];
-
- if (validate) {
- if (copy_from_kernel_nofault(orig_insn, (void *)pc,
- MCOUNT_INSN_SIZE))
- return -EFAULT;
- if (memcmp(orig_insn, old_insn, MCOUNT_INSN_SIZE))
- return -EINVAL;
- }
-
- if (copy_to_kernel_nofault((void *)pc, new_insn, MCOUNT_INSN_SIZE))
- return -EPERM;
-
- return 0;
-}
-
-static int ftrace_modify_code(unsigned long pc, unsigned long *old_insn,
- unsigned long *new_insn, bool validate)
-{
- int ret;
-
- ret = __ftrace_modify_code(pc, old_insn, new_insn, validate);
- if (ret)
- return ret;
-
- flush_icache_range(pc, pc + MCOUNT_INSN_SIZE);
-
- return ret;
-}
-
-int ftrace_update_ftrace_func(ftrace_func_t func)
-{
- unsigned long pc = (unsigned long)&ftrace_call;
- unsigned long old_insn[3] = {INSN_NOP, INSN_NOP, INSN_NOP};
- unsigned long new_insn[3] = {INSN_NOP, INSN_NOP, INSN_NOP};
-
- if (func != ftrace_stub)
- ftrace_gen_call_insn(new_insn, (unsigned long)func);
-
- return ftrace_modify_code(pc, old_insn, new_insn, false);
-}
-
-int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr)
-{
- unsigned long pc = rec->ip;
- unsigned long nop_insn[3] = {INSN_NOP, INSN_NOP, INSN_NOP};
- unsigned long call_insn[3] = {INSN_NOP, INSN_NOP, INSN_NOP};
-
- ftrace_gen_call_insn(call_insn, addr);
-
- return ftrace_modify_code(pc, nop_insn, call_insn, true);
-}
-
-int ftrace_make_nop(struct module *mod, struct dyn_ftrace *rec,
- unsigned long addr)
-{
- unsigned long pc = rec->ip;
- unsigned long nop_insn[3] = {INSN_NOP, INSN_NOP, INSN_NOP};
- unsigned long call_insn[3] = {INSN_NOP, INSN_NOP, INSN_NOP};
-
- ftrace_gen_call_insn(call_insn, addr);
-
- return ftrace_modify_code(pc, call_insn, nop_insn, true);
-}
-#endif /* CONFIG_DYNAMIC_FTRACE */
-
-#ifdef CONFIG_FUNCTION_GRAPH_TRACER
-void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr,
- unsigned long frame_pointer)
-{
- unsigned long return_hooker = (unsigned long)&return_to_handler;
- unsigned long old;
-
- if (unlikely(atomic_read(&current->tracing_graph_pause)))
- return;
-
- old = *parent;
-
- if (!function_graph_enter(old, self_addr, frame_pointer, NULL))
- *parent = return_hooker;
-}
-
-noinline void ftrace_graph_caller(void)
-{
- unsigned long *parent_ip =
- (unsigned long *)(__builtin_frame_address(2) - 4);
-
- unsigned long selfpc =
- (unsigned long)(__builtin_return_address(1) - MCOUNT_INSN_SIZE);
-
- unsigned long frame_pointer =
- (unsigned long)__builtin_frame_address(3);
-
- prepare_ftrace_return(parent_ip, selfpc, frame_pointer);
-}
-
-extern unsigned long ftrace_return_to_handler(unsigned long frame_pointer);
-void __naked return_to_handler(void)
-{
- __asm__ __volatile__ (
- /* save state needed by the ABI */
- "smw.adm $r0,[$sp],$r1,#0x0 \n\t"
-
- /* get original return address */
- "move $r0, $fp \n\t"
- "bal ftrace_return_to_handler\n\t"
- "move $lp, $r0 \n\t"
-
- /* restore state needed by the ABI */
- "lmw.bim $r0,[$sp],$r1,#0x0 \n\t");
-}
-
-#ifdef CONFIG_DYNAMIC_FTRACE
-extern unsigned long ftrace_graph_call;
-
-static int ftrace_modify_graph_caller(bool enable)
-{
- unsigned long pc = (unsigned long)&ftrace_graph_call;
- unsigned long nop_insn[3] = {INSN_NOP, INSN_NOP, INSN_NOP};
- unsigned long call_insn[3] = {INSN_NOP, INSN_NOP, INSN_NOP};
-
- ftrace_gen_call_insn(call_insn, (unsigned long)ftrace_graph_caller);
-
- if (enable)
- return ftrace_modify_code(pc, nop_insn, call_insn, true);
- else
- return ftrace_modify_code(pc, call_insn, nop_insn, true);
-}
-
-int ftrace_enable_ftrace_graph_caller(void)
-{
- return ftrace_modify_graph_caller(true);
-}
-
-int ftrace_disable_ftrace_graph_caller(void)
-{
- return ftrace_modify_graph_caller(false);
-}
-#endif /* CONFIG_DYNAMIC_FTRACE */
-
-#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
-
-
-#ifdef CONFIG_TRACE_IRQFLAGS
-noinline void __trace_hardirqs_off(void)
-{
- trace_hardirqs_off();
-}
-noinline void __trace_hardirqs_on(void)
-{
- trace_hardirqs_on();
-}
-#endif /* CONFIG_TRACE_IRQFLAGS */
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-15 07:22:10 +0100