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arm64: introduce aarch64_insn_gen_branch_reg() 

Introduce function to generate unconditional branch (register)
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 05:15:18 +01:00 committed by Will Deacon
parent 617d2fbc45
commit c0cafbae20
2 changed files with 40 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
arch/arm64/include/asm/insn.h
View File

@ -71,6 +71,7 @@ enum aarch64_insn_imm_type {
enum aarch64_insn_register_type {
AARCH64_INSN_REGTYPE_RT,
AARCH64_INSN_REGTYPE_RN,
};
enum aarch64_insn_register {
@ -119,6 +120,7 @@ enum aarch64_insn_variant {
enum aarch64_insn_branch_type {
AARCH64_INSN_BRANCH_NOLINK,
AARCH64_INSN_BRANCH_LINK,
AARCH64_INSN_BRANCH_RETURN,
AARCH64_INSN_BRANCH_COMP_ZERO,
AARCH64_INSN_BRANCH_COMP_NONZERO,
};
@ -138,6 +140,9 @@ __AARCH64_INSN_FUNCS(hvc, 0xFFE0001F, 0xD4000002)
__AARCH64_INSN_FUNCS(smc, 0xFFE0001F, 0xD4000003)
__AARCH64_INSN_FUNCS(brk, 0xFFE0001F, 0xD4200000)
__AARCH64_INSN_FUNCS(hint, 0xFFFFF01F, 0xD503201F)
__AARCH64_INSN_FUNCS(br, 0xFFFFFC1F, 0xD61F0000)
__AARCH64_INSN_FUNCS(blr, 0xFFFFFC1F, 0xD63F0000)
__AARCH64_INSN_FUNCS(ret, 0xFFFFFC1F, 0xD65F0000)
#undef __AARCH64_INSN_FUNCS
@ -156,6 +161,8 @@ u32 aarch64_insn_gen_comp_branch_imm(unsigned long pc, unsigned long addr,
enum aarch64_insn_branch_type type);
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,
enum aarch64_insn_branch_type type);
bool aarch64_insn_hotpatch_safe(u32 old_insn, u32 new_insn);

35
arch/arm64/kernel/insn.c
View File

@ -283,6 +283,9 @@ static u32 aarch64_insn_encode_register(enum aarch64_insn_register_type type,
case AARCH64_INSN_REGTYPE_RT:
shift = 0;
break;
case AARCH64_INSN_REGTYPE_RN:
shift = 5;
break;
default:
pr_err("%s: unknown register type encoding %d\n", __func__,
type);
@ -325,10 +328,16 @@ u32 __kprobes aarch64_insn_gen_branch_imm(unsigned long pc, unsigned long addr,
*/
offset = branch_imm_common(pc, addr, SZ_128M);
if (type == AARCH64_INSN_BRANCH_LINK)
switch (type) {
case AARCH64_INSN_BRANCH_LINK:
insn = aarch64_insn_get_bl_value();
else
break;
case AARCH64_INSN_BRANCH_NOLINK:
insn = aarch64_insn_get_b_value();
break;
default:
BUG_ON(1);
}
return aarch64_insn_encode_immediate(AARCH64_INSN_IMM_26, insn,
offset >> 2);
@ -380,3 +389,25 @@ u32 __kprobes aarch64_insn_gen_nop(void)
{
return aarch64_insn_gen_hint(AARCH64_INSN_HINT_NOP);
}
u32 aarch64_insn_gen_branch_reg(enum aarch64_insn_register reg,
enum aarch64_insn_branch_type type)
{
u32 insn;
switch (type) {
case AARCH64_INSN_BRANCH_NOLINK:
insn = aarch64_insn_get_br_value();
break;
case AARCH64_INSN_BRANCH_LINK:
insn = aarch64_insn_get_blr_value();
break;
case AARCH64_INSN_BRANCH_RETURN:
insn = aarch64_insn_get_ret_value();
break;
default:
BUG_ON(1);
}
return aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RN, insn, reg);
}