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powerpc/ftrace: Remove ftrace_32.S

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Functions in ftrace_32.S are common with PPC64.

Reuse the ones defined for PPC64 with slight modification
when required.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
[mpe: Squash in fixup diff from Christophe]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/5e837fc190504c4ef834272e70d60ae33f175d49.1640017960.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy 2021-12-20 16:38:44 +00:00 • committed by Michael Ellerman
parent 41315494be
commit 4ee83a2cfb
4 changed files with 17 additions and 155 deletions
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6
arch/powerpc/kernel/trace/Makefile
View file

@ -8,13 +8,13 @@ ifdef CONFIG_FUNCTION_TRACER
CFLAGS_REMOVE_ftrace.o = $(CC_FLAGS_FTRACE)
endif
obj32-$(CONFIG_FUNCTION_TRACER) += ftrace_32.o
obj64-$(CONFIG_FUNCTION_TRACER) += ftrace_64.o
obj32-$(CONFIG_FUNCTION_TRACER) += ftrace_mprofile.o
ifdef CONFIG_MPROFILE_KERNEL
obj64-$(CONFIG_FUNCTION_TRACER) += ftrace_64_mprofile.o
obj64-$(CONFIG_FUNCTION_TRACER) += ftrace_mprofile.o
else
obj64-$(CONFIG_FUNCTION_TRACER) += ftrace_64_pg.o
endif
obj-$(CONFIG_FUNCTION_TRACER) += ftrace_low.o
obj-$(CONFIG_DYNAMIC_FTRACE) += ftrace.o
obj-$(CONFIG_FUNCTION_GRAPH_TRACER) += ftrace.o
obj-$(CONFIG_FTRACE_SYSCALLS) += ftrace.o

152
arch/powerpc/kernel/trace/ftrace_32.S
View file

@ -1,152 +0,0 @@
/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Split from entry_32.S
*/
#include <linux/magic.h>
#include <asm/reg.h>
#include <asm/ppc_asm.h>
#include <asm/asm-offsets.h>
#include <asm/ftrace.h>
#include <asm/export.h>
#include <asm/ptrace.h>
_GLOBAL(mcount)
_GLOBAL(_mcount)
/*
* It is required that _mcount on PPC32 must preserve the
* link register. But we have r12 to play with. We use r12
* to push the return address back to the caller of mcount
* into the ctr register, restore the link register and
* then jump back using the ctr register.
*/
mflr r12
mtctr r12
mtlr r0
bctr
EXPORT_SYMBOL(_mcount)
_GLOBAL(ftrace_caller)
stwu r1, -INT_FRAME_SIZE(r1)
SAVE_GPRS(3, 10, r1)
addi r8, r1, INT_FRAME_SIZE
stw r8, GPR1(r1)
mflr r3
stw r3, _NIP(r1)
subi r3, r3, MCOUNT_INSN_SIZE
stw r0, _LINK(r1)
mr r4, r0
lis r5,function_trace_op@ha
lwz r5,function_trace_op@l(r5)
addi r6, r1, STACK_FRAME_OVERHEAD
.globl ftrace_call
ftrace_call:
bl ftrace_stub
nop
lwz r3, _NIP(r1)
mtctr r3
REST_GPRS(3, 10, r1)
lwz r0, _LINK(r1)
mtlr r0
addi r1, r1, INT_FRAME_SIZE
/* old link register ends up in ctr reg */
bctr
_GLOBAL(ftrace_stub)
blr
_GLOBAL(ftrace_regs_caller)
/* Create our stack frame + pt_regs */
stwu r1,-INT_FRAME_SIZE(r1)
/* Save all gprs to pt_regs */
stw r0, GPR0(r1)
stmw r2, GPR2(r1)
/* Save previous stack pointer (r1) */
addi r8, r1, INT_FRAME_SIZE
stw r8, GPR1(r1)
/* Load special regs for save below */
mfmsr r8
mfctr r9
mfxer r10
mfcr r11
/* Get the _mcount() call site out of LR */
mflr r7
/* Save it as pt_regs->nip */
stw r7, _NIP(r1)
/* Save the read LR in pt_regs->link */
stw r0, _LINK(r1)
lis r3,function_trace_op@ha
lwz r5,function_trace_op@l(r3)
/* Calculate ip from nip-4 into r3 for call below */
subi r3, r7, MCOUNT_INSN_SIZE
/* Put the original return address in r4 as parent_ip */
mr r4, r0
/* Save special regs */
stw r8, _MSR(r1)
stw r9, _CTR(r1)
stw r10, _XER(r1)
stw r11, _CCR(r1)
/* Load &pt_regs in r6 for call below */
addi r6, r1, STACK_FRAME_OVERHEAD
/* ftrace_call(r3, r4, r5, r6) */
.globl ftrace_regs_call
ftrace_regs_call:
bl ftrace_stub
nop
/* Load ctr with the possibly modified NIP */
lwz r3, _NIP(r1)
mtctr r3
/* Restore gprs */
lmw r2, GPR2(r1)
/* Restore possibly modified LR */
lwz r0, _LINK(r1)
mtlr r0
/* Pop our stack frame */
addi r1, r1, INT_FRAME_SIZE
/* old link register ends up in ctr reg */
bctr
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
_GLOBAL(return_to_handler)
/* need to save return values */
stwu r1, -16(r1)
stw r3, 8(r1)
stw r4, 12(r1)
bl ftrace_return_to_handler
/* return value has real return address */
mtlr r3
lwz r3, 8(r1)
lwz r4, 12(r1)
addi r1, r1, 16
/* Jump back to real return address */
blr
#endif /* CONFIG_FUNCTION_GRAPH_TRACER */

14
arch/powerpc/kernel/trace/ftrace_64.S → arch/powerpc/kernel/trace/ftrace_low.S
View file

@ -10,6 +10,7 @@
#include <asm/ppc-opcode.h>
#include <asm/export.h>
#ifdef CONFIG_PPC64
.pushsection ".tramp.ftrace.text","aw",@progbits;
.globl ftrace_tramp_text
ftrace_tramp_text:
@ -21,6 +22,7 @@ ftrace_tramp_text:
ftrace_tramp_init:
.space 64
.popsection
#endif
_GLOBAL(mcount)
_GLOBAL(_mcount)
@ -33,6 +35,7 @@ EXPORT_SYMBOL(_mcount)
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
_GLOBAL(return_to_handler)
/* need to save return values */
#ifdef CONFIG_PPC64
std r4, -32(r1)
std r3, -24(r1)
/* save TOC */
@ -46,6 +49,11 @@ _GLOBAL(return_to_handler)
* Switch to our TOC to run inside the core kernel.
*/
ld r2, PACATOC(r13)
#else
stwu r1, -16(r1)
stw r3, 8(r1)
stw r4, 12(r1)
#endif
bl ftrace_return_to_handler
nop
@ -53,11 +61,17 @@ _GLOBAL(return_to_handler)
/* return value has real return address */
mtlr r3
#ifdef CONFIG_PPC64
ld r1, 0(r1)
ld r4, -32(r1)
ld r3, -24(r1)
ld r2, -16(r1)
ld r31, -8(r1)
#else
lwz r3, 8(r1)
lwz r4, 12(r1)
addi r1, r1, 16
#endif
/* Jump back to real return address */
blr

0
arch/powerpc/kernel/trace/ftrace_64_mprofile.S → arch/powerpc/kernel/trace/ftrace_mprofile.S
View file