mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-27 13:05:03 +08:00
4733f09d88
The compiler has inserted 2 NOPs before the regular function prologue. T series registers are available and safe because of LoongArch's psABI. At runtime, we can replace nop with bl to enable ftrace call and replace bl with nop to disable ftrace call. The bl instruction requires us to save the original RA value, so it saves RA at t0 here. Details are: | Compiled | Disabled | Enabled | +------------+------------------------+------------------------+ | nop | move t0, ra | move t0, ra | | nop | nop | bl ftrace_caller | | func_body | func_body | func_body | The RA value will be recovered by ftrace_regs_entry, and restored into RA before returning to the regular function prologue. When a function is not being traced, the "move t0, ra" is not harmful. 1) ftrace_make_call, ftrace_make_nop (in kernel/ftrace.c) The two functions turn each recorded call site of filtered functions into a call to ftrace_caller or nops. 2) ftracce_update_ftrace_func (in kernel/ftrace.c) turns the nops at ftrace_call into a call to a generic entry for function tracers. 3) ftrace_caller (in kernel/mcount_dyn.S) The entry where each _mcount call sites calls to once they are filtered to be traced. Co-developed-by: Jinyang He <hejinyang@loongson.cn> Signed-off-by: Jinyang He <hejinyang@loongson.cn> Signed-off-by: Qing Zhang <zhangqing@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
51 lines
1.3 KiB
Makefile
51 lines
1.3 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
|
|
#
|
|
# Makefile for the Linux/LoongArch kernel.
|
|
#
|
|
|
|
extra-y := vmlinux.lds
|
|
|
|
obj-y += head.o cpu-probe.o cacheinfo.o env.o setup.o entry.o genex.o \
|
|
traps.o irq.o idle.o process.o dma.o mem.o io.o reset.o switch.o \
|
|
elf.o syscall.o signal.o time.o topology.o inst.o ptrace.o vdso.o \
|
|
alternative.o unaligned.o
|
|
|
|
obj-$(CONFIG_ACPI) += acpi.o
|
|
obj-$(CONFIG_EFI) += efi.o
|
|
|
|
obj-$(CONFIG_CPU_HAS_FPU) += fpu.o
|
|
|
|
ifdef CONFIG_FUNCTION_TRACER
|
|
ifndef CONFIG_DYNAMIC_FTRACE
|
|
obj-y += mcount.o ftrace.o
|
|
CFLAGS_REMOVE_ftrace.o = $(CC_FLAGS_FTRACE)
|
|
else
|
|
obj-y += mcount_dyn.o ftrace_dyn.o
|
|
CFLAGS_REMOVE_ftrace_dyn.o = $(CC_FLAGS_FTRACE)
|
|
endif
|
|
CFLAGS_REMOVE_inst.o = $(CC_FLAGS_FTRACE)
|
|
CFLAGS_REMOVE_time.o = $(CC_FLAGS_FTRACE)
|
|
CFLAGS_REMOVE_perf_event.o = $(CC_FLAGS_FTRACE)
|
|
endif
|
|
|
|
obj-$(CONFIG_MODULES) += module.o module-sections.o
|
|
obj-$(CONFIG_STACKTRACE) += stacktrace.o
|
|
|
|
obj-$(CONFIG_PROC_FS) += proc.o
|
|
|
|
obj-$(CONFIG_SMP) += smp.o
|
|
|
|
obj-$(CONFIG_NUMA) += numa.o
|
|
|
|
obj-$(CONFIG_MAGIC_SYSRQ) += sysrq.o
|
|
|
|
obj-$(CONFIG_KEXEC) += machine_kexec.o relocate_kernel.o
|
|
obj-$(CONFIG_CRASH_DUMP) += crash_dump.o
|
|
|
|
obj-$(CONFIG_UNWINDER_GUESS) += unwind_guess.o
|
|
obj-$(CONFIG_UNWINDER_PROLOGUE) += unwind_prologue.o
|
|
|
|
obj-$(CONFIG_PERF_EVENTS) += perf_event.o perf_regs.o
|
|
|
|
CPPFLAGS_vmlinux.lds := $(KBUILD_CFLAGS)
|