From: Naveen N Rao <naveen@kernel.org>
To: <linuxppc-dev@lists.ozlabs.org>,
<linux-trace-kernel@vger.kernel.org>, <bpf@vger.kernel.org>,
linux-kbuild@vger.kernel.org, <linux-kernel@vger.kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>,
Daniel Borkmann <daniel@iogearbox.net>,
Masahiro Yamada <masahiroy@kernel.org>,
Nicholas Piggin <npiggin@gmail.com>,
Alexei Starovoitov <ast@kernel.org>,
Steven Rostedt <rostedt@goodmis.org>,
Andrii Nakryiko <andrii@kernel.org>,
Christophe Leroy <christophe.leroy@csgroup.eu>,
Vishal Chourasia <vishalc@linux.ibm.com>,
Mahesh Salgaonkar <mahesh@linux.ibm.com>,
Hari Bathini <hbathini@linux.ibm.com>,
Masami Hiramatsu <mhiramat@kernel.org>
Subject: [RFC PATCH v4 16/17] samples/ftrace: Add support for ftrace direct samples on powerpc
Date: Sun, 14 Jul 2024 13:57:52 +0530 [thread overview]
Message-ID: <1ecbd80f9d91dcf1f3a283a14fce7d3c3a0a0f71.1720942106.git.naveen@kernel.org> (raw)
In-Reply-To: <cover.1720942106.git.naveen@kernel.org>
Add powerpc 32-bit and 64-bit samples for ftrace direct. This serves to
show the sample instruction sequence to be used by ftrace direct calls
to adhere to the ftrace ABI.
On 64-bit powerpc, TOC setup requires some additional work.
Signed-off-by: Naveen N Rao <naveen@kernel.org>
---
arch/powerpc/Kconfig | 2 +
samples/ftrace/ftrace-direct-modify.c | 85 +++++++++++++++-
samples/ftrace/ftrace-direct-multi-modify.c | 101 +++++++++++++++++++-
samples/ftrace/ftrace-direct-multi.c | 79 ++++++++++++++-
samples/ftrace/ftrace-direct-too.c | 83 +++++++++++++++-
samples/ftrace/ftrace-direct.c | 69 ++++++++++++-
6 files changed, 414 insertions(+), 5 deletions(-)
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 29aab3770415..f6ff44acf112 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -275,6 +275,8 @@ config PPC
select HAVE_REGS_AND_STACK_ACCESS_API
select HAVE_RELIABLE_STACKTRACE
select HAVE_RSEQ
+ select HAVE_SAMPLE_FTRACE_DIRECT if HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS
+ select HAVE_SAMPLE_FTRACE_DIRECT_MULTI if HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS
select HAVE_SETUP_PER_CPU_AREA if PPC64
select HAVE_SOFTIRQ_ON_OWN_STACK
select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2)
diff --git a/samples/ftrace/ftrace-direct-modify.c b/samples/ftrace/ftrace-direct-modify.c
index 81220390851a..cfea7a38befb 100644
--- a/samples/ftrace/ftrace-direct-modify.c
+++ b/samples/ftrace/ftrace-direct-modify.c
@@ -2,7 +2,7 @@
#include <linux/module.h>
#include <linux/kthread.h>
#include <linux/ftrace.h>
-#ifndef CONFIG_ARM64
+#if !defined(CONFIG_ARM64) && !defined(CONFIG_PPC32)
#include <asm/asm-offsets.h>
#endif
@@ -199,6 +199,89 @@ asm (
#endif /* CONFIG_LOONGARCH */
+#ifdef CONFIG_PPC
+#include <asm/ppc_asm.h>
+
+#ifdef CONFIG_PPC64
+#define STACK_FRAME_SIZE 48
+#else
+#define STACK_FRAME_SIZE 24
+#endif
+
+#if defined(CONFIG_PPC64_ELF_ABI_V2) && !defined(CONFIG_PPC_KERNEL_PCREL)
+#define PPC64_TOC_SAVE_AND_UPDATE \
+" std 2, 24(1)\n" \
+" bcl 20, 31, 1f\n" \
+" 1: mflr 12\n" \
+" ld 2, (99f - 1b)(12)\n"
+#define PPC64_TOC_RESTORE \
+" ld 2, 24(1)\n"
+#define PPC64_TOC \
+" 99: .quad .TOC.@tocbase\n"
+#else
+#define PPC64_TOC_SAVE_AND_UPDATE ""
+#define PPC64_TOC_RESTORE ""
+#define PPC64_TOC ""
+#endif
+
+#ifdef CONFIG_PPC_FTRACE_OUT_OF_LINE
+#define PPC_FTRACE_RESTORE_LR \
+ PPC_LL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n" \
+" mtlr 0\n"
+#define PPC_FTRACE_RET \
+" blr\n"
+#else
+#define PPC_FTRACE_RESTORE_LR \
+ PPC_LL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n" \
+" mtctr 0\n"
+#define PPC_FTRACE_RET \
+" mtlr 0\n" \
+" bctr\n"
+#endif
+
+asm (
+" .pushsection .text, \"ax\", @progbits\n"
+" .type my_tramp1, @function\n"
+" .globl my_tramp1\n"
+" my_tramp1:\n"
+ PPC_STL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n"
+ PPC_STLU" 1, -"__stringify(STACK_FRAME_MIN_SIZE)"(1)\n"
+" mflr 0\n"
+ PPC_STL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n"
+ PPC_STLU" 1, -"__stringify(STACK_FRAME_SIZE)"(1)\n"
+ PPC64_TOC_SAVE_AND_UPDATE
+" bl my_direct_func1\n"
+ PPC64_TOC_RESTORE
+" addi 1, 1, "__stringify(STACK_FRAME_SIZE)"\n"
+ PPC_FTRACE_RESTORE_LR
+" addi 1, 1, "__stringify(STACK_FRAME_MIN_SIZE)"\n"
+ PPC_LL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n"
+ PPC_FTRACE_RET
+" .size my_tramp1, .-my_tramp1\n"
+
+" .type my_tramp2, @function\n"
+" .globl my_tramp2\n"
+" my_tramp2:\n"
+ PPC_STL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n"
+ PPC_STLU" 1, -"__stringify(STACK_FRAME_MIN_SIZE)"(1)\n"
+" mflr 0\n"
+ PPC_STL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n"
+ PPC_STLU" 1, -"__stringify(STACK_FRAME_SIZE)"(1)\n"
+ PPC64_TOC_SAVE_AND_UPDATE
+" bl my_direct_func2\n"
+ PPC64_TOC_RESTORE
+" addi 1, 1, "__stringify(STACK_FRAME_SIZE)"\n"
+ PPC_FTRACE_RESTORE_LR
+" addi 1, 1, "__stringify(STACK_FRAME_MIN_SIZE)"\n"
+ PPC_LL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n"
+ PPC_FTRACE_RET
+ PPC64_TOC
+" .size my_tramp2, .-my_tramp2\n"
+" .popsection\n"
+);
+
+#endif /* CONFIG_PPC */
+
static struct ftrace_ops direct;
static unsigned long my_tramp = (unsigned long)my_tramp1;
diff --git a/samples/ftrace/ftrace-direct-multi-modify.c b/samples/ftrace/ftrace-direct-multi-modify.c
index f943e40d57fd..8f7986d698d8 100644
--- a/samples/ftrace/ftrace-direct-multi-modify.c
+++ b/samples/ftrace/ftrace-direct-multi-modify.c
@@ -2,7 +2,7 @@
#include <linux/module.h>
#include <linux/kthread.h>
#include <linux/ftrace.h>
-#ifndef CONFIG_ARM64
+#if !defined(CONFIG_ARM64) && !defined(CONFIG_PPC32)
#include <asm/asm-offsets.h>
#endif
@@ -225,6 +225,105 @@ asm (
#endif /* CONFIG_LOONGARCH */
+#ifdef CONFIG_PPC
+#include <asm/ppc_asm.h>
+
+#ifdef CONFIG_PPC64
+#define STACK_FRAME_SIZE 48
+#else
+#define STACK_FRAME_SIZE 24
+#endif
+
+#if defined(CONFIG_PPC64_ELF_ABI_V2) && !defined(CONFIG_PPC_KERNEL_PCREL)
+#define PPC64_TOC_SAVE_AND_UPDATE \
+" std 2, 24(1)\n" \
+" bcl 20, 31, 1f\n" \
+" 1: mflr 12\n" \
+" ld 2, (99f - 1b)(12)\n"
+#define PPC64_TOC_RESTORE \
+" ld 2, 24(1)\n"
+#define PPC64_TOC \
+" 99: .quad .TOC.@tocbase\n"
+#else
+#define PPC64_TOC_SAVE_AND_UPDATE ""
+#define PPC64_TOC_RESTORE ""
+#define PPC64_TOC ""
+#endif
+
+#ifdef CONFIG_PPC_FTRACE_OUT_OF_LINE
+#define PPC_FTRACE_RESTORE_LR \
+ PPC_LL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n" \
+" mtlr 0\n"
+#define PPC_FTRACE_RET \
+" blr\n"
+#define PPC_FTRACE_RECOVER_IP \
+" lwz 8, 4(3)\n" \
+" li 9, 6\n" \
+" slw 8, 8, 9\n" \
+" sraw 8, 8, 9\n" \
+" add 3, 3, 8\n" \
+" addi 3, 3, 4\n"
+#else
+#define PPC_FTRACE_RESTORE_LR \
+ PPC_LL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n" \
+" mtctr 0\n"
+#define PPC_FTRACE_RET \
+" mtlr 0\n" \
+" bctr\n"
+#define PPC_FTRACE_RECOVER_IP ""
+#endif
+
+asm (
+" .pushsection .text, \"ax\", @progbits\n"
+" .type my_tramp1, @function\n"
+" .globl my_tramp1\n"
+" my_tramp1:\n"
+ PPC_STL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n"
+ PPC_STLU" 1, -"__stringify(STACK_FRAME_MIN_SIZE)"(1)\n"
+" mflr 0\n"
+ PPC_STL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n"
+ PPC_STLU" 1, -"__stringify(STACK_FRAME_SIZE)"(1)\n"
+ PPC64_TOC_SAVE_AND_UPDATE
+ PPC_STL" 3, "__stringify(STACK_FRAME_MIN_SIZE)"(1)\n"
+" mr 3, 0\n"
+ PPC_FTRACE_RECOVER_IP
+" bl my_direct_func1\n"
+ PPC_LL" 3, "__stringify(STACK_FRAME_MIN_SIZE)"(1)\n"
+ PPC64_TOC_RESTORE
+" addi 1, 1, "__stringify(STACK_FRAME_SIZE)"\n"
+ PPC_FTRACE_RESTORE_LR
+" addi 1, 1, "__stringify(STACK_FRAME_MIN_SIZE)"\n"
+ PPC_LL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n"
+ PPC_FTRACE_RET
+" .size my_tramp1, .-my_tramp1\n"
+
+" .type my_tramp2, @function\n"
+" .globl my_tramp2\n"
+" my_tramp2:\n"
+ PPC_STL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n"
+ PPC_STLU" 1, -"__stringify(STACK_FRAME_MIN_SIZE)"(1)\n"
+" mflr 0\n"
+ PPC_STL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n"
+ PPC_STLU" 1, -"__stringify(STACK_FRAME_SIZE)"(1)\n"
+ PPC64_TOC_SAVE_AND_UPDATE
+ PPC_STL" 3, "__stringify(STACK_FRAME_MIN_SIZE)"(1)\n"
+" mr 3, 0\n"
+ PPC_FTRACE_RECOVER_IP
+" bl my_direct_func2\n"
+ PPC_LL" 3, "__stringify(STACK_FRAME_MIN_SIZE)"(1)\n"
+ PPC64_TOC_RESTORE
+" addi 1, 1, "__stringify(STACK_FRAME_SIZE)"\n"
+ PPC_FTRACE_RESTORE_LR
+" addi 1, 1, "__stringify(STACK_FRAME_MIN_SIZE)"\n"
+ PPC_LL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n"
+ PPC_FTRACE_RET
+ PPC64_TOC
+ " .size my_tramp2, .-my_tramp2\n"
+" .popsection\n"
+);
+
+#endif /* CONFIG_PPC */
+
static unsigned long my_tramp = (unsigned long)my_tramp1;
static unsigned long tramps[2] = {
(unsigned long)my_tramp1,
diff --git a/samples/ftrace/ftrace-direct-multi.c b/samples/ftrace/ftrace-direct-multi.c
index aed6df2927ce..db326c81a27d 100644
--- a/samples/ftrace/ftrace-direct-multi.c
+++ b/samples/ftrace/ftrace-direct-multi.c
@@ -4,7 +4,7 @@
#include <linux/mm.h> /* for handle_mm_fault() */
#include <linux/ftrace.h>
#include <linux/sched/stat.h>
-#ifndef CONFIG_ARM64
+#if !defined(CONFIG_ARM64) && !defined(CONFIG_PPC32)
#include <asm/asm-offsets.h>
#endif
@@ -141,6 +141,83 @@ asm (
#endif /* CONFIG_LOONGARCH */
+#ifdef CONFIG_PPC
+#include <asm/ppc_asm.h>
+
+#ifdef CONFIG_PPC64
+#define STACK_FRAME_SIZE 48
+#else
+#define STACK_FRAME_SIZE 24
+#endif
+
+#if defined(CONFIG_PPC64_ELF_ABI_V2) && !defined(CONFIG_PPC_KERNEL_PCREL)
+#define PPC64_TOC_SAVE_AND_UPDATE \
+" std 2, 24(1)\n" \
+" bcl 20, 31, 1f\n" \
+" 1: mflr 12\n" \
+" ld 2, (99f - 1b)(12)\n"
+#define PPC64_TOC_RESTORE \
+" ld 2, 24(1)\n"
+#define PPC64_TOC \
+" 99: .quad .TOC.@tocbase\n"
+#else
+#define PPC64_TOC_SAVE_AND_UPDATE ""
+#define PPC64_TOC_RESTORE ""
+#define PPC64_TOC ""
+#endif
+
+#ifdef CONFIG_PPC_FTRACE_OUT_OF_LINE
+#define PPC_FTRACE_RESTORE_LR \
+ PPC_LL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n" \
+" mtlr 0\n"
+#define PPC_FTRACE_RET \
+" blr\n"
+#define PPC_FTRACE_RECOVER_IP \
+" lwz 8, 4(3)\n" \
+" li 9, 6\n" \
+" slw 8, 8, 9\n" \
+" sraw 8, 8, 9\n" \
+" add 3, 3, 8\n" \
+" addi 3, 3, 4\n"
+#else
+#define PPC_FTRACE_RESTORE_LR \
+ PPC_LL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n" \
+" mtctr 0\n"
+#define PPC_FTRACE_RET \
+" mtlr 0\n" \
+" bctr\n"
+#define PPC_FTRACE_RECOVER_IP ""
+#endif
+
+asm (
+" .pushsection .text, \"ax\", @progbits\n"
+" .type my_tramp, @function\n"
+" .globl my_tramp\n"
+" my_tramp:\n"
+ PPC_STL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n"
+ PPC_STLU" 1, -"__stringify(STACK_FRAME_MIN_SIZE)"(1)\n"
+" mflr 0\n"
+ PPC_STL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n"
+ PPC_STLU" 1, -"__stringify(STACK_FRAME_SIZE)"(1)\n"
+ PPC64_TOC_SAVE_AND_UPDATE
+ PPC_STL" 3, "__stringify(STACK_FRAME_MIN_SIZE)"(1)\n"
+" mr 3, 0\n"
+ PPC_FTRACE_RECOVER_IP
+" bl my_direct_func\n"
+ PPC_LL" 3, "__stringify(STACK_FRAME_MIN_SIZE)"(1)\n"
+ PPC64_TOC_RESTORE
+" addi 1, 1, "__stringify(STACK_FRAME_SIZE)"\n"
+ PPC_FTRACE_RESTORE_LR
+" addi 1, 1, "__stringify(STACK_FRAME_MIN_SIZE)"\n"
+ PPC_LL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n"
+ PPC_FTRACE_RET
+ PPC64_TOC
+" .size my_tramp, .-my_tramp\n"
+" .popsection\n"
+);
+
+#endif /* CONFIG_PPC */
+
static struct ftrace_ops direct;
static int __init ftrace_direct_multi_init(void)
diff --git a/samples/ftrace/ftrace-direct-too.c b/samples/ftrace/ftrace-direct-too.c
index 6ff546a5d7eb..3d0fa260332d 100644
--- a/samples/ftrace/ftrace-direct-too.c
+++ b/samples/ftrace/ftrace-direct-too.c
@@ -3,7 +3,7 @@
#include <linux/mm.h> /* for handle_mm_fault() */
#include <linux/ftrace.h>
-#ifndef CONFIG_ARM64
+#if !defined(CONFIG_ARM64) && !defined(CONFIG_PPC32)
#include <asm/asm-offsets.h>
#endif
@@ -153,6 +153,87 @@ asm (
#endif /* CONFIG_LOONGARCH */
+#ifdef CONFIG_PPC
+#include <asm/ppc_asm.h>
+
+#ifdef CONFIG_PPC64
+#define STACK_FRAME_SIZE 64
+#define STACK_FRAME_ARG1 32
+#define STACK_FRAME_ARG2 40
+#define STACK_FRAME_ARG3 48
+#define STACK_FRAME_ARG4 56
+#else
+#define STACK_FRAME_SIZE 32
+#define STACK_FRAME_ARG1 16
+#define STACK_FRAME_ARG2 20
+#define STACK_FRAME_ARG3 24
+#define STACK_FRAME_ARG4 28
+#endif
+
+#if defined(CONFIG_PPC64_ELF_ABI_V2) && !defined(CONFIG_PPC_KERNEL_PCREL)
+#define PPC64_TOC_SAVE_AND_UPDATE \
+" std 2, 24(1)\n" \
+" bcl 20, 31, 1f\n" \
+" 1: mflr 12\n" \
+" ld 2, (99f - 1b)(12)\n"
+#define PPC64_TOC_RESTORE \
+" ld 2, 24(1)\n"
+#define PPC64_TOC \
+" 99: .quad .TOC.@tocbase\n"
+#else
+#define PPC64_TOC_SAVE_AND_UPDATE ""
+#define PPC64_TOC_RESTORE ""
+#define PPC64_TOC ""
+#endif
+
+#ifdef CONFIG_PPC_FTRACE_OUT_OF_LINE
+#define PPC_FTRACE_RESTORE_LR \
+ PPC_LL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n" \
+" mtlr 0\n"
+#define PPC_FTRACE_RET \
+" blr\n"
+#else
+#define PPC_FTRACE_RESTORE_LR \
+ PPC_LL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n" \
+" mtctr 0\n"
+#define PPC_FTRACE_RET \
+" mtlr 0\n" \
+" bctr\n"
+#endif
+
+asm (
+" .pushsection .text, \"ax\", @progbits\n"
+" .type my_tramp, @function\n"
+" .globl my_tramp\n"
+" my_tramp:\n"
+ PPC_STL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n"
+ PPC_STLU" 1, -"__stringify(STACK_FRAME_MIN_SIZE)"(1)\n"
+" mflr 0\n"
+ PPC_STL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n"
+ PPC_STLU" 1, -"__stringify(STACK_FRAME_SIZE)"(1)\n"
+ PPC64_TOC_SAVE_AND_UPDATE
+ PPC_STL" 3, "__stringify(STACK_FRAME_ARG1)"(1)\n"
+ PPC_STL" 4, "__stringify(STACK_FRAME_ARG2)"(1)\n"
+ PPC_STL" 5, "__stringify(STACK_FRAME_ARG3)"(1)\n"
+ PPC_STL" 6, "__stringify(STACK_FRAME_ARG4)"(1)\n"
+" bl my_direct_func\n"
+ PPC_LL" 6, "__stringify(STACK_FRAME_ARG4)"(1)\n"
+ PPC_LL" 5, "__stringify(STACK_FRAME_ARG3)"(1)\n"
+ PPC_LL" 4, "__stringify(STACK_FRAME_ARG2)"(1)\n"
+ PPC_LL" 3, "__stringify(STACK_FRAME_ARG1)"(1)\n"
+ PPC64_TOC_RESTORE
+" addi 1, 1, "__stringify(STACK_FRAME_SIZE)"\n"
+ PPC_FTRACE_RESTORE_LR
+" addi 1, 1, "__stringify(STACK_FRAME_MIN_SIZE)"\n"
+ PPC_LL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n"
+ PPC_FTRACE_RET
+ PPC64_TOC
+" .size my_tramp, .-my_tramp\n"
+" .popsection\n"
+);
+
+#endif /* CONFIG_PPC */
+
static struct ftrace_ops direct;
static int __init ftrace_direct_init(void)
diff --git a/samples/ftrace/ftrace-direct.c b/samples/ftrace/ftrace-direct.c
index ef0945670e1e..956834b0d19a 100644
--- a/samples/ftrace/ftrace-direct.c
+++ b/samples/ftrace/ftrace-direct.c
@@ -3,7 +3,7 @@
#include <linux/sched.h> /* for wake_up_process() */
#include <linux/ftrace.h>
-#ifndef CONFIG_ARM64
+#if !defined(CONFIG_ARM64) && !defined(CONFIG_PPC32)
#include <asm/asm-offsets.h>
#endif
@@ -134,6 +134,73 @@ asm (
#endif /* CONFIG_LOONGARCH */
+#ifdef CONFIG_PPC
+#include <asm/ppc_asm.h>
+
+#ifdef CONFIG_PPC64
+#define STACK_FRAME_SIZE 48
+#else
+#define STACK_FRAME_SIZE 24
+#endif
+
+#if defined(CONFIG_PPC64_ELF_ABI_V2) && !defined(CONFIG_PPC_KERNEL_PCREL)
+#define PPC64_TOC_SAVE_AND_UPDATE \
+" std 2, 24(1)\n" \
+" bcl 20, 31, 1f\n" \
+" 1: mflr 12\n" \
+" ld 2, (99f - 1b)(12)\n"
+#define PPC64_TOC_RESTORE \
+" ld 2, 24(1)\n"
+#define PPC64_TOC \
+" 99: .quad .TOC.@tocbase\n"
+#else
+#define PPC64_TOC_SAVE_AND_UPDATE ""
+#define PPC64_TOC_RESTORE ""
+#define PPC64_TOC ""
+#endif
+
+#ifdef CONFIG_PPC_FTRACE_OUT_OF_LINE
+#define PPC_FTRACE_RESTORE_LR \
+ PPC_LL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n" \
+" mtlr 0\n"
+#define PPC_FTRACE_RET \
+" blr\n"
+#else
+#define PPC_FTRACE_RESTORE_LR \
+ PPC_LL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n" \
+" mtctr 0\n"
+#define PPC_FTRACE_RET \
+" mtlr 0\n" \
+" bctr\n"
+#endif
+
+asm (
+" .pushsection .text, \"ax\", @progbits\n"
+" .type my_tramp, @function\n"
+" .globl my_tramp\n"
+" my_tramp:\n"
+ PPC_STL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n"
+ PPC_STLU" 1, -"__stringify(STACK_FRAME_MIN_SIZE)"(1)\n"
+" mflr 0\n"
+ PPC_STL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n"
+ PPC_STLU" 1, -"__stringify(STACK_FRAME_SIZE)"(1)\n"
+ PPC64_TOC_SAVE_AND_UPDATE
+ PPC_STL" 3, "__stringify(STACK_FRAME_MIN_SIZE)"(1)\n"
+" bl my_direct_func\n"
+ PPC_LL" 3, "__stringify(STACK_FRAME_MIN_SIZE)"(1)\n"
+ PPC64_TOC_RESTORE
+" addi 1, 1, "__stringify(STACK_FRAME_SIZE)"\n"
+ PPC_FTRACE_RESTORE_LR
+" addi 1, 1, "__stringify(STACK_FRAME_MIN_SIZE)"\n"
+ PPC_LL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n"
+ PPC_FTRACE_RET
+ PPC64_TOC
+" .size my_tramp, .-my_tramp\n"
+" .popsection\n"
+);
+
+#endif /* CONFIG_PPC */
+
static struct ftrace_ops direct;
static int __init ftrace_direct_init(void)
--
2.45.2
next prev parent reply other threads:[~2024-07-14 8:33 UTC|newest]
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2024-07-14 8:27 [RFC PATCH v4 00/17] powerpc: Core ftrace rework, support for ftrace direct and bpf trampolines Naveen N Rao
2024-07-14 8:27 ` [RFC PATCH v4 01/17] powerpc/trace: Account for -fpatchable-function-entry support by toolchain Naveen N Rao
2024-07-14 8:27 ` [RFC PATCH v4 02/17] powerpc/kprobes: Use ftrace to determine if a probe is at function entry Naveen N Rao
2024-07-14 8:27 ` [RFC PATCH v4 03/17] powerpc64/ftrace: Nop out additional 'std' instruction emitted by gcc v5.x Naveen N Rao
2024-07-14 8:27 ` [RFC PATCH v4 04/17] powerpc32/ftrace: Unify 32-bit and 64-bit ftrace entry code Naveen N Rao
2024-07-14 8:27 ` [RFC PATCH v4 05/17] powerpc/module_64: Convert #ifdef to IS_ENABLED() Naveen N Rao
2024-07-14 8:27 ` [RFC PATCH v4 06/17] powerpc/ftrace: Remove pointer to struct module from dyn_arch_ftrace Naveen N Rao
2024-07-14 8:27 ` [RFC PATCH v4 07/17] powerpc/ftrace: Skip instruction patching if the instructions are the same Naveen N Rao
2024-07-14 8:27 ` [RFC PATCH v4 08/17] powerpc/ftrace: Move ftrace stub used for init text before _einittext Naveen N Rao
2024-07-15 6:52 ` Nicholas Piggin
2024-07-14 8:27 ` [RFC PATCH v4 09/17] powerpc64/bpf: Fold bpf_jit_emit_func_call_hlp() into bpf_jit_emit_func_call_rel() Naveen N Rao
2024-07-14 8:27 ` [RFC PATCH v4 10/17] powerpc/ftrace: Add a postlink script to validate function tracer Naveen N Rao
2024-07-14 8:27 ` [RFC PATCH v4 11/17] kbuild: Add generic hook for architectures to use before the final vmlinux link Naveen N Rao
2024-07-15 7:29 ` Nicholas Piggin
2024-07-14 8:27 ` [RFC PATCH v4 12/17] powerpc64/ftrace: Move ftrace sequence out of line Naveen N Rao
2024-07-15 8:25 ` Nicholas Piggin
2024-07-15 12:42 ` David Laight
2024-08-27 9:12 ` Masahiro Yamada
2024-07-14 8:27 ` [RFC PATCH v4 13/17] powerpc64/ftrace: Support .text larger than 32MB with out-of-line stubs Naveen N Rao
2024-07-15 8:27 ` Nicholas Piggin
2024-07-14 8:27 ` [RFC PATCH v4 14/17] powerpc/ftrace: Add support for DYNAMIC_FTRACE_WITH_CALL_OPS Naveen N Rao
2024-07-14 8:27 ` [RFC PATCH v4 15/17] powerpc/ftrace: Add support for DYNAMIC_FTRACE_WITH_DIRECT_CALLS Naveen N Rao
2024-07-14 8:27 ` Naveen N Rao [this message]
2024-07-14 8:27 ` [RFC PATCH v4 17/17] powerpc64/bpf: Add support for bpf trampolines Naveen N Rao
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