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tile/jump_label: add jump label support for TILE-Gx

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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
2015-09-30 10:11:45 +08:00
committed by Chris Metcalf
parent f419e6f63c
commit 65a792e84f
6 changed files with 184 additions and 10 deletions
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59
arch/tile/include/asm/insn.h Normal file
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/*
* 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 */

58
arch/tile/include/asm/jump_label.h Normal file
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/*
* 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 */