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Subject[PATCH v4 5/6] riscv/ftrace: Add DYNAMIC_FTRACE_WITH_REGS support
Date
Cc: Greentime Hu <greentime@andestech.com>
Signed-off-by: Alan Kao <alankao@andestech.com>
---
arch/riscv/Kconfig | 1 +
arch/riscv/include/asm/ftrace.h | 1 +
arch/riscv/kernel/ftrace.c | 17 ++++++
arch/riscv/kernel/mcount-dyn.S | 122 ++++++++++++++++++++++++++++++++++++++++
4 files changed, 141 insertions(+)

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index df05acbb53d3..e4f9bac8ed76 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -122,6 +122,7 @@ config ARCH_RV64I
select HAVE_FUNCTION_GRAPH_TRACER
select HAVE_FTRACE_MCOUNT_RECORD
select HAVE_DYNAMIC_FTRACE
+ select HAVE_DYNAMIC_FTRACE_WITH_REGS

endchoice

diff --git a/arch/riscv/include/asm/ftrace.h b/arch/riscv/include/asm/ftrace.h
index fedadc40e358..c6dcc5291f97 100644
--- a/arch/riscv/include/asm/ftrace.h
+++ b/arch/riscv/include/asm/ftrace.h
@@ -8,6 +8,7 @@
#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__
diff --git a/arch/riscv/kernel/ftrace.c b/arch/riscv/kernel/ftrace.c
index 5bbe1afd9463..48b5353691c3 100644
--- a/arch/riscv/kernel/ftrace.c
+++ b/arch/riscv/kernel/ftrace.c
@@ -106,6 +106,23 @@ int __init ftrace_dyn_arch_init(void)
}
#endif

+#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
+int ftrace_modify_call(struct dyn_ftrace *rec, unsigned long old_addr,
+ unsigned long addr)
+{
+ unsigned int call[2];
+ int ret;
+
+ make_call(rec->ip, old_addr, call);
+ ret = ftrace_check_current_call(rec->ip, call);
+
+ if (ret)
+ return ret;
+
+ return __ftrace_modify_call(rec->ip, addr, true);
+}
+#endif
+
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
/*
* Most of this function is copied from arm64.
diff --git a/arch/riscv/kernel/mcount-dyn.S b/arch/riscv/kernel/mcount-dyn.S
index 6bbc3f88fcb3..35a6ed76cb8b 100644
--- a/arch/riscv/kernel/mcount-dyn.S
+++ b/arch/riscv/kernel/mcount-dyn.S
@@ -115,3 +115,125 @@ ftrace_call:
RESTORE_ABI_STATE
ret
ENDPROC(ftrace_caller)
+
+#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
+ .macro SAVE_ALL
+ addi sp, sp, -(PT_SIZE_ON_STACK+16)
+ sd s0, (PT_SIZE_ON_STACK)(sp)
+ sd ra, (PT_SIZE_ON_STACK+8)(sp)
+ addi s0, sp, (PT_SIZE_ON_STACK+16)
+
+ sd x1, PT_RA(sp)
+ sd x2, PT_SP(sp)
+ sd x3, PT_GP(sp)
+ sd x4, PT_TP(sp)
+ sd x5, PT_T0(sp)
+ sd x6, PT_T1(sp)
+ sd x7, PT_T2(sp)
+ sd x8, PT_S0(sp)
+ sd x9, PT_S1(sp)
+ sd x10, PT_A0(sp)
+ sd x11, PT_A1(sp)
+ sd x12, PT_A2(sp)
+ sd x13, PT_A3(sp)
+ sd x14, PT_A4(sp)
+ sd x15, PT_A5(sp)
+ sd x16, PT_A6(sp)
+ sd x17, PT_A7(sp)
+ sd x18, PT_S2(sp)
+ sd x19, PT_S3(sp)
+ sd x20, PT_S4(sp)
+ sd x21, PT_S5(sp)
+ sd x22, PT_S6(sp)
+ sd x23, PT_S7(sp)
+ sd x24, PT_S8(sp)
+ sd x25, PT_S9(sp)
+ sd x26, PT_S10(sp)
+ sd x27, PT_S11(sp)
+ sd x28, PT_T3(sp)
+ sd x29, PT_T4(sp)
+ sd x30, PT_T5(sp)
+ sd x31, PT_T6(sp)
+ .endm
+
+ .macro RESTORE_ALL
+ ld x1, PT_RA(sp)
+ ld x2, PT_SP(sp)
+ ld x3, PT_GP(sp)
+ ld x4, PT_TP(sp)
+ ld x5, PT_T0(sp)
+ ld x6, PT_T1(sp)
+ ld x7, PT_T2(sp)
+ ld x8, PT_S0(sp)
+ ld x9, PT_S1(sp)
+ ld x10, PT_A0(sp)
+ ld x11, PT_A1(sp)
+ ld x12, PT_A2(sp)
+ ld x13, PT_A3(sp)
+ ld x14, PT_A4(sp)
+ ld x15, PT_A5(sp)
+ ld x16, PT_A6(sp)
+ ld x17, PT_A7(sp)
+ ld x18, PT_S2(sp)
+ ld x19, PT_S3(sp)
+ ld x20, PT_S4(sp)
+ ld x21, PT_S5(sp)
+ ld x22, PT_S6(sp)
+ ld x23, PT_S7(sp)
+ ld x24, PT_S8(sp)
+ ld x25, PT_S9(sp)
+ ld x26, PT_S10(sp)
+ ld x27, PT_S11(sp)
+ ld x28, PT_T3(sp)
+ ld x29, PT_T4(sp)
+ ld x30, PT_T5(sp)
+ ld x31, PT_T6(sp)
+
+ ld s0, (PT_SIZE_ON_STACK)(sp)
+ ld ra, (PT_SIZE_ON_STACK+8)(sp)
+ addi sp, sp, (PT_SIZE_ON_STACK+16)
+ .endm
+
+ .macro RESTORE_GRAPH_REG_ARGS
+ ld a0, PT_T0(sp)
+ ld a1, PT_T1(sp)
+#ifdef HAVE_FUNCTION_GRAPH_FP_TEST
+ ld a2, PT_T2(sp)
+#endif
+ .endm
+
+/*
+ * Most of the contents are the same as ftrace_caller.
+ */
+ENTRY(ftrace_regs_caller)
+ /*
+ * a3: the address of all registers in the stack
+ */
+ ld a1, -8(s0)
+ addi a0, ra, -MCOUNT_INSN_SIZE
+ la t5, function_trace_op
+ ld a2, 0(t5)
+ addi a3, sp, -(PT_SIZE_ON_STACK+16)
+
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+ addi t0, s0, -8
+ mv t1, a0
+#ifdef HAVE_FUNCTION_GRAPH_FP_TEST
+ ld t2, -16(s0)
+#endif
+#endif
+ SAVE_ALL
+
+ftrace_regs_call:
+ .global ftrace_regs_call
+ call ftrace_stub
+
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+ RESTORE_GRAPH_REG_ARGS
+ call ftrace_graph_caller
+#endif
+
+ RESTORE_ALL
+ ret
+ENDPROC(ftrace_regs_caller)
+#endif /* CONFIG_DYNAMIC_FTRACE_WITH_REGS */
--
2.15.1
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