mirror of https://gitee.com/openkylin/linux.git
tile/jump_label: add jump label support for TILE-Gx
Add the arch-specific code to support jump label for TILE-Gx. This code shares NOP instruction with ftrace, so we move it to a common header file. Reviewed-by: Chris Metcalf <cmetcalf@ezchip.com> Signed-off-by: Zhigang Lu <zlu@ezchip.com> Signed-off-by: Chris Metcalf <cmetcalf@ezchip.com>
This commit is contained in:
Zhigang Lu
Chris Metcalf
parent
f419e6f63c
commit
65a792e84f
|
|
@ -143,6 +143,7 @@ config TILEGX
|
|||
select HAVE_KRETPROBES
|
||||
select HAVE_ARCH_KGDB
|
||||
select ARCH_SUPPORTS_ATOMIC_RMW
|
||||
select HAVE_ARCH_JUMP_LABEL
|
||||
|
||||
config TILEPRO
|
||||
def_bool !TILEGX
|
||||
|
|
|
|||
|
|
@ -0,0 +1,59 @@
|
|||
/*
|
||||
* Copyright 2015 Tilera Corporation. All Rights Reserved.
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or
|
||||
* modify it under the terms of the GNU General Public License
|
||||
* as published by the Free Software Foundation, version 2.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful, but
|
||||
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
|
||||
* NON INFRINGEMENT. See the GNU General Public License for
|
||||
* more details.
|
||||
*/
|
||||
#ifndef __ASM_TILE_INSN_H
|
||||
#define __ASM_TILE_INSN_H
|
||||
|
||||
#include <arch/opcode.h>
|
||||
|
||||
static inline tilegx_bundle_bits NOP(void)
|
||||
{
|
||||
return create_UnaryOpcodeExtension_X0(FNOP_UNARY_OPCODE_X0) |
|
||||
create_RRROpcodeExtension_X0(UNARY_RRR_0_OPCODE_X0) |
|
||||
create_Opcode_X0(RRR_0_OPCODE_X0) |
|
||||
create_UnaryOpcodeExtension_X1(NOP_UNARY_OPCODE_X1) |
|
||||
create_RRROpcodeExtension_X1(UNARY_RRR_0_OPCODE_X1) |
|
||||
create_Opcode_X1(RRR_0_OPCODE_X1);
|
||||
}
|
||||
|
||||
static inline tilegx_bundle_bits tilegx_gen_branch(unsigned long pc,
|
||||
unsigned long addr,
|
||||
bool link)
|
||||
{
|
||||
tilegx_bundle_bits opcode_x0, opcode_x1;
|
||||
long pcrel_by_instr = (addr - pc) >> TILEGX_LOG2_BUNDLE_SIZE_IN_BYTES;
|
||||
|
||||
if (link) {
|
||||
/* opcode: jal addr */
|
||||
opcode_x1 =
|
||||
create_Opcode_X1(JUMP_OPCODE_X1) |
|
||||
create_JumpOpcodeExtension_X1(JAL_JUMP_OPCODE_X1) |
|
||||
create_JumpOff_X1(pcrel_by_instr);
|
||||
} else {
|
||||
/* opcode: j addr */
|
||||
opcode_x1 =
|
||||
create_Opcode_X1(JUMP_OPCODE_X1) |
|
||||
create_JumpOpcodeExtension_X1(J_JUMP_OPCODE_X1) |
|
||||
create_JumpOff_X1(pcrel_by_instr);
|
||||
}
|
||||
|
||||
/* opcode: fnop */
|
||||
opcode_x0 =
|
||||
create_UnaryOpcodeExtension_X0(FNOP_UNARY_OPCODE_X0) |
|
||||
create_RRROpcodeExtension_X0(UNARY_RRR_0_OPCODE_X0) |
|
||||
create_Opcode_X0(RRR_0_OPCODE_X0);
|
||||
|
||||
return opcode_x1 | opcode_x0;
|
||||
}
|
||||
|
||||
#endif /* __ASM_TILE_INSN_H */
|
||||
|
|
@ -0,0 +1,58 @@
|
|||
/*
|
||||
* Copyright 2015 Tilera Corporation. All Rights Reserved.
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or
|
||||
* modify it under the terms of the GNU General Public License
|
||||
* as published by the Free Software Foundation, version 2.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful, but
|
||||
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
|
||||
* NON INFRINGEMENT. See the GNU General Public License for
|
||||
* more details.
|
||||
*/
|
||||
|
||||
#ifndef _ASM_TILE_JUMP_LABEL_H
|
||||
#define _ASM_TILE_JUMP_LABEL_H
|
||||
|
||||
#include <arch/opcode.h>
|
||||
|
||||
#define JUMP_LABEL_NOP_SIZE TILE_BUNDLE_SIZE_IN_BYTES
|
||||
|
||||
static __always_inline bool arch_static_branch(struct static_key *key,
|
||||
bool branch)
|
||||
{
|
||||
asm_volatile_goto("1:\n\t"
|
||||
"nop" "\n\t"
|
||||
".pushsection __jump_table, \"aw\"\n\t"
|
||||
".quad 1b, %l[l_yes], %0 + %1 \n\t"
|
||||
".popsection\n\t"
|
||||
: : "i" (key), "i" (branch) : : l_yes);
|
||||
return false;
|
||||
l_yes:
|
||||
return true;
|
||||
}
|
||||
|
||||
static __always_inline bool arch_static_branch_jump(struct static_key *key,
|
||||
bool branch)
|
||||
{
|
||||
asm_volatile_goto("1:\n\t"
|
||||
"j %l[l_yes]" "\n\t"
|
||||
".pushsection __jump_table, \"aw\"\n\t"
|
||||
".quad 1b, %l[l_yes], %0 + %1 \n\t"
|
||||
".popsection\n\t"
|
||||
: : "i" (key), "i" (branch) : : l_yes);
|
||||
return false;
|
||||
l_yes:
|
||||
return true;
|
||||
}
|
||||
|
||||
typedef u64 jump_label_t;
|
||||
|
||||
struct jump_entry {
|
||||
jump_label_t code;
|
||||
jump_label_t target;
|
||||
jump_label_t key;
|
||||
};
|
||||
|
||||
#endif /* _ASM_TILE_JUMP_LABEL_H */
|
||||
|
|
@ -32,5 +32,6 @@ obj-$(CONFIG_TILE_HVGLUE_TRACE) += hvglue_trace.o
|
|||
obj-$(CONFIG_FUNCTION_TRACER) += ftrace.o mcount_64.o
|
||||
obj-$(CONFIG_KPROBES) += kprobes.o
|
||||
obj-$(CONFIG_KGDB) += kgdb.o
|
||||
obj-$(CONFIG_JUMP_LABEL) += jump_label.o
|
||||
|
||||
obj-y += vdso/
|
||||
|
|
|
|||
|
|
@ -20,21 +20,12 @@
|
|||
#include <asm/cacheflush.h>
|
||||
#include <asm/ftrace.h>
|
||||
#include <asm/sections.h>
|
||||
#include <asm/insn.h>
|
||||
|
||||
#include <arch/opcode.h>
|
||||
|
||||
#ifdef CONFIG_DYNAMIC_FTRACE
|
||||
|
||||
static inline tilegx_bundle_bits NOP(void)
|
||||
{
|
||||
return create_UnaryOpcodeExtension_X0(FNOP_UNARY_OPCODE_X0) |
|
||||
create_RRROpcodeExtension_X0(UNARY_RRR_0_OPCODE_X0) |
|
||||
create_Opcode_X0(RRR_0_OPCODE_X0) |
|
||||
create_UnaryOpcodeExtension_X1(NOP_UNARY_OPCODE_X1) |
|
||||
create_RRROpcodeExtension_X1(UNARY_RRR_0_OPCODE_X1) |
|
||||
create_Opcode_X1(RRR_0_OPCODE_X1);
|
||||
}
|
||||
|
||||
static int machine_stopped __read_mostly;
|
||||
|
||||
int ftrace_arch_code_modify_prepare(void)
|
||||
|
|
|
|||
|
|
@ -0,0 +1,64 @@
|
|||
/*
|
||||
* Copyright 2015 Tilera Corporation. All Rights Reserved.
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or
|
||||
* modify it under the terms of the GNU General Public License
|
||||
* as published by the Free Software Foundation, version 2.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful, but
|
||||
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
|
||||
* NON INFRINGEMENT. See the GNU General Public License for
|
||||
* more details.
|
||||
*
|
||||
* jump label TILE-Gx support
|
||||
*/
|
||||
|
||||
#include <linux/jump_label.h>
|
||||
#include <linux/memory.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/mutex.h>
|
||||
#include <linux/cpu.h>
|
||||
|
||||
#include <asm/cacheflush.h>
|
||||
#include <asm/insn.h>
|
||||
|
||||
#ifdef HAVE_JUMP_LABEL
|
||||
|
||||
static void __jump_label_transform(struct jump_entry *e,
|
||||
enum jump_label_type type)
|
||||
{
|
||||
tilegx_bundle_bits opcode;
|
||||
/* Operate on writable kernel text mapping. */
|
||||
unsigned long pc_wr = ktext_writable_addr(e->code);
|
||||
|
||||
if (type == JUMP_LABEL_JMP)
|
||||
opcode = tilegx_gen_branch(e->code, e->target, false);
|
||||
else
|
||||
opcode = NOP();
|
||||
|
||||
*(tilegx_bundle_bits *)pc_wr = opcode;
|
||||
/* Make sure that above mem writes were issued towards the memory. */
|
||||
smp_wmb();
|
||||
}
|
||||
|
||||
void arch_jump_label_transform(struct jump_entry *e,
|
||||
enum jump_label_type type)
|
||||
{
|
||||
get_online_cpus();
|
||||
mutex_lock(&text_mutex);
|
||||
|
||||
__jump_label_transform(e, type);
|
||||
flush_icache_range(e->code, e->code + sizeof(tilegx_bundle_bits));
|
||||
|
||||
mutex_unlock(&text_mutex);
|
||||
put_online_cpus();
|
||||
}
|
||||
|
||||
__init_or_module void arch_jump_label_transform_static(struct jump_entry *e,
|
||||
enum jump_label_type type)
|
||||
{
|
||||
__jump_label_transform(e, type);
|
||||
}
|
||||
|
||||
#endif /* HAVE_JUMP_LABEL */
|
||||
Loading…
Reference in New Issue