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arm64: introduce aarch64_insn_gen_cond_branch_imm()

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Introduce function to generate conditional branch (immediate)
instructions.

Signed-off-by: Zi Shen Lim <zlim.lnx@gmail.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Zi Shen Lim 2014-08-27 05:15:19 +01:00 committed by Will Deacon
parent c0cafbae20
commit 345e0d35ec
2 changed files with 38 additions and 0 deletions
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21
arch/arm64/include/asm/insn.h
View File

@ -117,6 +117,24 @@ enum aarch64_insn_variant {
AARCH64_INSN_VARIANT_64BIT
};
enum aarch64_insn_condition {
AARCH64_INSN_COND_EQ = 0x0, /* == */
AARCH64_INSN_COND_NE = 0x1, /* != */
AARCH64_INSN_COND_CS = 0x2, /* unsigned >= */
AARCH64_INSN_COND_CC = 0x3, /* unsigned < */
AARCH64_INSN_COND_MI = 0x4, /* < 0 */
AARCH64_INSN_COND_PL = 0x5, /* >= 0 */
AARCH64_INSN_COND_VS = 0x6, /* overflow */
AARCH64_INSN_COND_VC = 0x7, /* no overflow */
AARCH64_INSN_COND_HI = 0x8, /* unsigned > */
AARCH64_INSN_COND_LS = 0x9, /* unsigned <= */
AARCH64_INSN_COND_GE = 0xa, /* signed >= */
AARCH64_INSN_COND_LT = 0xb, /* signed < */
AARCH64_INSN_COND_GT = 0xc, /* signed > */
AARCH64_INSN_COND_LE = 0xd, /* signed <= */
AARCH64_INSN_COND_AL = 0xe, /* always */
};
enum aarch64_insn_branch_type {
AARCH64_INSN_BRANCH_NOLINK,
AARCH64_INSN_BRANCH_LINK,
@ -135,6 +153,7 @@ __AARCH64_INSN_FUNCS(b, 0xFC000000, 0x14000000)
__AARCH64_INSN_FUNCS(bl, 0xFC000000, 0x94000000)
__AARCH64_INSN_FUNCS(cbz, 0xFE000000, 0x34000000)
__AARCH64_INSN_FUNCS(cbnz, 0xFE000000, 0x35000000)
__AARCH64_INSN_FUNCS(bcond, 0xFF000010, 0x54000000)
__AARCH64_INSN_FUNCS(svc, 0xFFE0001F, 0xD4000001)
__AARCH64_INSN_FUNCS(hvc, 0xFFE0001F, 0xD4000002)
__AARCH64_INSN_FUNCS(smc, 0xFFE0001F, 0xD4000003)
@ -159,6 +178,8 @@ u32 aarch64_insn_gen_comp_branch_imm(unsigned long pc, unsigned long addr,
enum aarch64_insn_register reg,
enum aarch64_insn_variant variant,
enum aarch64_insn_branch_type type);
u32 aarch64_insn_gen_cond_branch_imm(unsigned long pc, unsigned long addr,
enum aarch64_insn_condition cond);
u32 aarch64_insn_gen_hint(enum aarch64_insn_hint_op op);
u32 aarch64_insn_gen_nop(void);
u32 aarch64_insn_gen_branch_reg(enum aarch64_insn_register reg,

17
arch/arm64/kernel/insn.c
View File

@ -380,6 +380,23 @@ u32 aarch64_insn_gen_comp_branch_imm(unsigned long pc, unsigned long addr,
offset >> 2);
}
u32 aarch64_insn_gen_cond_branch_imm(unsigned long pc, unsigned long addr,
enum aarch64_insn_condition cond)
{
u32 insn;
long offset;
offset = branch_imm_common(pc, addr, SZ_1M);
insn = aarch64_insn_get_bcond_value();
BUG_ON(cond < AARCH64_INSN_COND_EQ || cond > AARCH64_INSN_COND_AL);
insn |= cond;
return aarch64_insn_encode_immediate(AARCH64_INSN_IMM_19, insn,
offset >> 2);
}
u32 __kprobes aarch64_insn_gen_hint(enum aarch64_insn_hint_op op)
{
return aarch64_insn_get_hint_value() | op;