From: Donglin Peng <pengdonglin@sangfor.com.cn>
To: mhiramat@kernel.org, rostedt@goodmis.org, linux@armlinux.org.uk,
mark.rutland@arm.com, will@kernel.org, catalin.marinas@arm.com,
rmk+kernel@armlinux.org.uk, palmer@dabbelt.com,
paul.walmsley@sifive.com, aou@eecs.berkeley.edu,
tglx@linutronix.de, dave.hansen@linux.intel.com, x86@kernel.org,
bp@alien8.de, hpa@zytor.com, chenhuacai@kernel.org,
zhangqing@loongson.cn, kernel@xen0n.name, mingo@redhat.com,
peterz@infradead.org, xiehuan09@gmail.com,
dinghui@sangfor.com.cn, huangcun@sangfor.com.cn,
dolinux.peng@gmail.com
Cc: linux-trace-kernel@vger.kernel.org, loongarch@lists.linux.dev,
linux-riscv@lists.infradead.org,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org,
Donglin Peng <pengdonglin@sangfor.com.cn>
Subject: [PATCH v11 4/8] arm64: ftrace: Enable HAVE_FUNCTION_GRAPH_RETVAL
Date: Sat, 8 Apr 2023 05:42:18 -0700 [thread overview]
Message-ID: <c78366416ce93f704ae7000c4ee60eb4258c38f7.1680954589.git.pengdonglin@sangfor.com.cn> (raw)
In-Reply-To: <cover.1680954589.git.pengdonglin@sangfor.com.cn>
The previous patch ("function_graph: Support recording and printing
the return value of function") has laid the groundwork for the for
the funcgraph-retval, and this modification makes it available on
the ARM64 platform.
We introduce a new structure called fgraph_ret_regs for the ARM64
platform to hold return registers and the frame pointer. We then
fill its content in the return_to_handler and pass its address to
the function ftrace_return_to_handler to record the return value.
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Tested-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Donglin Peng <pengdonglin@sangfor.com.cn>
---
v10:
- Use CONFIG_FUNCTION_GRAPH_TRACER to control fgraph_ret_regs definition
v9:
- Update the commit message
v8:
- Fix issues in ARM64 asm code
- Modify the control range of CONFIG_HAVE_FUNCTION_GRAPH_RETVAL
---
arch/arm64/Kconfig | 1 +
arch/arm64/include/asm/ftrace.h | 22 ++++++++++++++++++++++
arch/arm64/kernel/asm-offsets.c | 13 +++++++++++++
arch/arm64/kernel/entry-ftrace.S | 27 ++++++++++++++-------------
4 files changed, 50 insertions(+), 13 deletions(-)
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 1023e896d46b..48856d230800 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -195,6 +195,7 @@ config ARM64
select HAVE_FTRACE_MCOUNT_RECORD
select HAVE_FUNCTION_TRACER
select HAVE_FUNCTION_ERROR_INJECTION
+ select HAVE_FUNCTION_GRAPH_RETVAL if HAVE_FUNCTION_GRAPH_TRACER
select HAVE_FUNCTION_GRAPH_TRACER
select HAVE_GCC_PLUGINS
select HAVE_HW_BREAKPOINT if PERF_EVENTS
diff --git a/arch/arm64/include/asm/ftrace.h b/arch/arm64/include/asm/ftrace.h
index 1c2672bbbf37..657adcbd80a4 100644
--- a/arch/arm64/include/asm/ftrace.h
+++ b/arch/arm64/include/asm/ftrace.h
@@ -170,4 +170,26 @@ static inline bool arch_syscall_match_sym_name(const char *sym,
}
#endif /* ifndef __ASSEMBLY__ */
+#ifndef __ASSEMBLY__
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+struct fgraph_ret_regs {
+ /* x0 - x7 */
+ unsigned long regs[8];
+
+ unsigned long fp;
+ unsigned long __unused;
+};
+
+static inline unsigned long fgraph_ret_regs_return_value(struct fgraph_ret_regs *ret_regs)
+{
+ return ret_regs->regs[0];
+}
+
+static inline unsigned long fgraph_ret_regs_frame_pointer(struct fgraph_ret_regs *ret_regs)
+{
+ return ret_regs->fp;
+}
+#endif /* ifdef CONFIG_FUNCTION_GRAPH_TRACER */
+#endif
+
#endif /* __ASM_FTRACE_H */
diff --git a/arch/arm64/kernel/asm-offsets.c b/arch/arm64/kernel/asm-offsets.c
index ae345b06e9f7..75082e0409bf 100644
--- a/arch/arm64/kernel/asm-offsets.c
+++ b/arch/arm64/kernel/asm-offsets.c
@@ -197,6 +197,19 @@ int main(void)
#endif
#ifdef CONFIG_FUNCTION_TRACER
DEFINE(FTRACE_OPS_FUNC, offsetof(struct ftrace_ops, func));
+#endif
+ BLANK();
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+ DEFINE(FGRET_REGS_X0, offsetof(struct fgraph_ret_regs, regs[0]));
+ DEFINE(FGRET_REGS_X1, offsetof(struct fgraph_ret_regs, regs[1]));
+ DEFINE(FGRET_REGS_X2, offsetof(struct fgraph_ret_regs, regs[2]));
+ DEFINE(FGRET_REGS_X3, offsetof(struct fgraph_ret_regs, regs[3]));
+ DEFINE(FGRET_REGS_X4, offsetof(struct fgraph_ret_regs, regs[4]));
+ DEFINE(FGRET_REGS_X5, offsetof(struct fgraph_ret_regs, regs[5]));
+ DEFINE(FGRET_REGS_X6, offsetof(struct fgraph_ret_regs, regs[6]));
+ DEFINE(FGRET_REGS_X7, offsetof(struct fgraph_ret_regs, regs[7]));
+ DEFINE(FGRET_REGS_FP, offsetof(struct fgraph_ret_regs, fp));
+ DEFINE(FGRET_REGS_SIZE, sizeof(struct fgraph_ret_regs));
#endif
return 0;
}
diff --git a/arch/arm64/kernel/entry-ftrace.S b/arch/arm64/kernel/entry-ftrace.S
index 350ed81324ac..da1443bcf776 100644
--- a/arch/arm64/kernel/entry-ftrace.S
+++ b/arch/arm64/kernel/entry-ftrace.S
@@ -270,22 +270,23 @@ SYM_FUNC_END(ftrace_stub_graph)
*/
SYM_CODE_START(return_to_handler)
/* save return value regs */
- sub sp, sp, #64
- stp x0, x1, [sp]
- stp x2, x3, [sp, #16]
- stp x4, x5, [sp, #32]
- stp x6, x7, [sp, #48]
+ sub sp, sp, #FGRET_REGS_SIZE
+ stp x0, x1, [sp, #FGRET_REGS_X0]
+ stp x2, x3, [sp, #FGRET_REGS_X2]
+ stp x4, x5, [sp, #FGRET_REGS_X4]
+ stp x6, x7, [sp, #FGRET_REGS_X6]
+ str x29, [sp, #FGRET_REGS_FP] // parent's fp
- mov x0, x29 // parent's fp
- bl ftrace_return_to_handler// addr = ftrace_return_to_hander(fp);
- mov x30, x0 // restore the original return address
+ mov x0, sp
+ bl ftrace_return_to_handler // addr = ftrace_return_to_hander(regs);
+ mov x30, x0 // restore the original return address
/* restore return value regs */
- ldp x0, x1, [sp]
- ldp x2, x3, [sp, #16]
- ldp x4, x5, [sp, #32]
- ldp x6, x7, [sp, #48]
- add sp, sp, #64
+ ldp x0, x1, [sp, #FGRET_REGS_X0]
+ ldp x2, x3, [sp, #FGRET_REGS_X2]
+ ldp x4, x5, [sp, #FGRET_REGS_X4]
+ ldp x6, x7, [sp, #FGRET_REGS_X6]
+ add sp, sp, #FGRET_REGS_SIZE
ret
SYM_CODE_END(return_to_handler)
--
2.25.1
next prev parent reply other threads:[~2023-04-08 12:43 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-04-08 12:42 [PATCH v11 0/8] function_graph: Support recording and printing the return value of function Donglin Peng
2023-04-08 12:42 ` [PATCH v11 1/8] " Donglin Peng
2023-04-14 7:44 ` Donglin Peng
2023-04-14 7:55 ` Donglin Peng
2023-04-24 20:23 ` Steven Rostedt
2023-04-08 12:42 ` [PATCH v11 2/8] tracing: Add documentation for funcgraph-retval and funcgraph-retval-hex Donglin Peng
2023-04-08 12:42 ` [PATCH v11 3/8] ARM: ftrace: Enable HAVE_FUNCTION_GRAPH_RETVAL Donglin Peng
2023-06-09 1:57 ` Steven Rostedt
2023-06-09 3:22 ` Donglin Peng
2023-06-09 21:21 ` Steven Rostedt
2023-04-08 12:42 ` Donglin Peng [this message]
2023-06-09 9:31 ` [PATCH v11 4/8] arm64: " Catalin Marinas
2023-06-09 17:19 ` Steven Rostedt
2023-04-08 12:42 ` [PATCH v11 5/8] riscv: " Donglin Peng
2023-06-09 1:58 ` Steven Rostedt
2023-06-20 19:54 ` Palmer Dabbelt
2023-04-08 12:42 ` [PATCH v11 6/8] x86/ftrace: " Donglin Peng
2023-04-08 12:42 ` [PATCH v11 7/8] LoongArch: ftrace: " Donglin Peng
2023-04-08 12:42 ` [PATCH v11 8/8] selftests/ftrace: Add funcgraph-retval test case Donglin Peng
2023-04-25 3:55 ` Masami Hiramatsu
2023-04-25 0:25 ` [PATCH v11 0/8] function_graph: Support recording and printing the return value of function Steven Rostedt
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=c78366416ce93f704ae7000c4ee60eb4258c38f7.1680954589.git.pengdonglin@sangfor.com.cn \
--to=pengdonglin@sangfor.com.cn \
--cc=aou@eecs.berkeley.edu \
--cc=bp@alien8.de \
--cc=catalin.marinas@arm.com \
--cc=chenhuacai@kernel.org \
--cc=dave.hansen@linux.intel.com \
--cc=dinghui@sangfor.com.cn \
--cc=dolinux.peng@gmail.com \
--cc=hpa@zytor.com \
--cc=huangcun@sangfor.com.cn \
--cc=kernel@xen0n.name \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-riscv@lists.infradead.org \
--cc=linux-trace-kernel@vger.kernel.org \
--cc=linux@armlinux.org.uk \
--cc=loongarch@lists.linux.dev \
--cc=mark.rutland@arm.com \
--cc=mhiramat@kernel.org \
--cc=mingo@redhat.com \
--cc=palmer@dabbelt.com \
--cc=paul.walmsley@sifive.com \
--cc=peterz@infradead.org \
--cc=rmk+kernel@armlinux.org.uk \
--cc=rostedt@goodmis.org \
--cc=tglx@linutronix.de \
--cc=will@kernel.org \
--cc=x86@kernel.org \
--cc=xiehuan09@gmail.com \
--cc=zhangqing@loongson.cn \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).