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riscv/ftrace: Add basic support
This patch contains basic ftrace support for RV64I platform. Specifically, function tracer (HAVE_FUNCTION_TRACER), function graph tracer (HAVE_FUNCTION_GRAPH_TRACER), and a frame pointer test (HAVE_FUNCTION_GRAPH_FP_TEST) are implemented following the instructions in Documentation/trace/ftrace-design.txt. Note that the functions in both ftrace.c and setup.c should not be hooked with the compiler's -pg option: to prevent infinite self- referencing for the former, and to ignore early setup stuff for the latter. Signed-off-by: Alan Kao <alankao@andestech.com> Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
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5d44bf2065
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@ -55,6 +55,9 @@ config PAGE_OFFSET
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config STACKTRACE_SUPPORT
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config STACKTRACE_SUPPORT
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def_bool y
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def_bool y
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config TRACE_IRQFLAGS_SUPPORT
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def_bool y
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config RWSEM_GENERIC_SPINLOCK
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config RWSEM_GENERIC_SPINLOCK
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def_bool y
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def_bool y
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@ -107,6 +110,8 @@ config ARCH_RV64I
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bool "RV64I"
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bool "RV64I"
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select CPU_SUPPORTS_64BIT_KERNEL
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select CPU_SUPPORTS_64BIT_KERNEL
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select 64BIT
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select 64BIT
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select HAVE_FUNCTION_TRACER
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select HAVE_FUNCTION_GRAPH_TRACER
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endchoice
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endchoice
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@ -12,7 +12,6 @@ generic-y += errno.h
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generic-y += exec.h
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generic-y += exec.h
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generic-y += fb.h
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generic-y += fb.h
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generic-y += fcntl.h
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generic-y += fcntl.h
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generic-y += ftrace.h
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generic-y += futex.h
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generic-y += futex.h
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generic-y += hardirq.h
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generic-y += hardirq.h
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generic-y += hash.h
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generic-y += hash.h
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10
arch/riscv/include/asm/ftrace.h
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10
arch/riscv/include/asm/ftrace.h
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@ -0,0 +1,10 @@
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/* SPDX-License-Identifier: GPL-2.0 */
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/* Copyright (C) 2017 Andes Technology Corporation */
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/*
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* The graph frame test is not possible if CONFIG_FRAME_POINTER is not enabled.
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* Check arch/riscv/kernel/mcount.S for detail.
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*/
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#if defined(CONFIG_FUNCTION_GRAPH_TRACER) && defined(CONFIG_FRAME_POINTER)
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#define HAVE_FUNCTION_GRAPH_FP_TEST
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#endif
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@ -2,6 +2,11 @@
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# Makefile for the RISC-V Linux kernel
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# Makefile for the RISC-V Linux kernel
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#
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#
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ifdef CONFIG_FTRACE
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CFLAGS_REMOVE_ftrace.o = -pg
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CFLAGS_REMOVE_setup.o = -pg
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endif
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extra-y += head.o
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extra-y += head.o
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extra-y += vmlinux.lds
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extra-y += vmlinux.lds
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@ -29,5 +34,7 @@ CFLAGS_setup.o := -mcmodel=medany
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obj-$(CONFIG_SMP) += smpboot.o
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obj-$(CONFIG_SMP) += smpboot.o
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obj-$(CONFIG_SMP) += smp.o
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obj-$(CONFIG_SMP) += smp.o
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obj-$(CONFIG_MODULES) += module.o
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obj-$(CONFIG_MODULES) += module.o
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obj-$(CONFIG_FUNCTION_TRACER) += mcount.o
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obj-$(CONFIG_FUNCTION_GRAPH_TRACER) += ftrace.o
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clean:
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clean:
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41
arch/riscv/kernel/ftrace.c
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arch/riscv/kernel/ftrace.c
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@ -0,0 +1,41 @@
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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2013 Linaro Limited
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* Author: AKASHI Takahiro <takahiro.akashi@linaro.org>
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* Copyright (C) 2017 Andes Technology Corporation
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*/
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#include <linux/ftrace.h>
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/*
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* Most of this file is copied from arm64.
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*/
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void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr,
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unsigned long frame_pointer)
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{
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unsigned long return_hooker = (unsigned long)&return_to_handler;
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unsigned long old;
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struct ftrace_graph_ent trace;
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int err;
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if (unlikely(atomic_read(¤t->tracing_graph_pause)))
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return;
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/*
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* We don't suffer access faults, so no extra fault-recovery assembly
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* is needed here.
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*/
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old = *parent;
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trace.func = self_addr;
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trace.depth = current->curr_ret_stack + 1;
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if (!ftrace_graph_entry(&trace))
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return;
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err = ftrace_push_return_trace(old, self_addr, &trace.depth,
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frame_pointer, NULL);
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if (err == -EBUSY)
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return;
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*parent = return_hooker;
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}
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126
arch/riscv/kernel/mcount.S
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126
arch/riscv/kernel/mcount.S
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@ -0,0 +1,126 @@
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/* SPDX-License-Identifier: GPL-2.0 */
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/* Copyright (C) 2017 Andes Technology Corporation */
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#include <linux/init.h>
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#include <linux/linkage.h>
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#include <asm/asm.h>
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#include <asm/csr.h>
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#include <asm/unistd.h>
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#include <asm/thread_info.h>
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#include <asm/asm-offsets.h>
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#include <asm-generic/export.h>
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#include <asm/ftrace.h>
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.text
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.macro SAVE_ABI_STATE
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addi sp, sp, -16
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sd s0, 0(sp)
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sd ra, 8(sp)
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addi s0, sp, 16
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.endm
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/*
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* The call to ftrace_return_to_handler would overwrite the return
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* register if a0 was not saved.
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*/
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.macro SAVE_RET_ABI_STATE
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addi sp, sp, -32
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sd s0, 16(sp)
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sd ra, 24(sp)
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sd a0, 8(sp)
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addi s0, sp, 32
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.endm
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.macro STORE_ABI_STATE
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ld ra, 8(sp)
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ld s0, 0(sp)
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addi sp, sp, 16
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.endm
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.macro STORE_RET_ABI_STATE
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ld ra, 24(sp)
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ld s0, 16(sp)
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ld a0, 8(sp)
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addi sp, sp, 32
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.endm
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ENTRY(ftrace_stub)
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ret
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ENDPROC(ftrace_stub)
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#ifdef CONFIG_FUNCTION_GRAPH_TRACER
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ENTRY(return_to_handler)
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/*
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* On implementing the frame point test, the ideal way is to compare the
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* s0 (frame pointer, if enabled) on entry and the sp (stack pointer) on return.
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* However, the psABI of variable-length-argument functions does not allow this.
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*
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* So alternatively we check the *old* frame pointer position, that is, the
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* value stored in -16(s0) on entry, and the s0 on return.
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*/
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#ifdef HAVE_FUNCTION_GRAPH_FP_TEST
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mv t6, s0
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#endif
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SAVE_RET_ABI_STATE
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#ifdef HAVE_FUNCTION_GRAPH_FP_TEST
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mv a0, t6
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#endif
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la t0, ftrace_return_to_handler
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jalr t0
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mv a1, a0
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STORE_RET_ABI_STATE
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jalr a1
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ENDPROC(return_to_handler)
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EXPORT_SYMBOL(return_to_handler)
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#endif
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ENTRY(_mcount)
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la t4, ftrace_stub
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#ifdef CONFIG_FUNCTION_GRAPH_TRACER
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la t0, ftrace_graph_return
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ld t1, 0(t0)
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bne t1, t4, do_ftrace_graph_caller
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la t3, ftrace_graph_entry
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ld t2, 0(t3)
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la t6, ftrace_graph_entry_stub
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bne t2, t6, do_ftrace_graph_caller
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#endif
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la t3, ftrace_trace_function
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ld t5, 0(t3)
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bne t5, t4, do_trace
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ret
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#ifdef CONFIG_FUNCTION_GRAPH_TRACER
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/*
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* A pseudo representation for the function graph tracer:
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* prepare_to_return(&ra_to_caller_of_caller, ra_to_caller)
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*/
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do_ftrace_graph_caller:
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addi a0, s0, -8
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mv a1, ra
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#ifdef HAVE_FUNCTION_GRAPH_FP_TEST
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ld a2, -16(s0)
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#endif
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SAVE_ABI_STATE
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la t0, prepare_ftrace_return
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jalr t0
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STORE_ABI_STATE
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ret
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#endif
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/*
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* A pseudo representation for the function tracer:
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* (*ftrace_trace_function)(ra_to_caller, ra_to_caller_of_caller)
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*/
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do_trace:
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ld a1, -8(s0)
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mv a0, ra
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SAVE_ABI_STATE
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jalr t5
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STORE_ABI_STATE
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ret
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ENDPROC(_mcount)
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EXPORT_SYMBOL(_mcount)
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