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Commit 71db948b authored by Naveen N Rao's avatar Naveen N Rao Committed by Michael Ellerman
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samples/ftrace: Add support for ftrace direct samples on powerpc 


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: default avatarNaveen N Rao <naveen@kernel.org>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Link: https://patch.msgid.link/20241030070850.1361304-17-hbathini@linux.ibm.com
parent a52f6043
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arch/powerpc/Kconfig
+ 2
− 0
View file @ 71db948b
......@@ -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 && $(cc-option,$(m32-flag) -mstack-protector-guard=tls -mstack-protector-guard-reg=r2 -mstack-protector-guard-offset=0)
......
samples/ftrace/ftrace-direct-modify.c
+ 84
− 1
View file @ 71db948b
......@@ -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;
......
samples/ftrace/ftrace-direct-multi-modify.c
+ 100
− 1
View file @ 71db948b
......@@ -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,
......
samples/ftrace/ftrace-direct-multi.c
+ 78
− 1
View file @ 71db948b
......@@ -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)
......
samples/ftrace/ftrace-direct-too.c
+ 82
− 1
View file @ 71db948b
......@@ -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)
......
samples/ftrace/ftrace-direct.c
+ 68
− 1
View file @ 71db948b
......@@ -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)
......
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