diff options
| author | Ard Biesheuvel <ard.biesheuvel@linaro.org> | 2018-11-22 09:46:45 +0100 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2018-11-27 18:47:33 +0000 |
| commit | 7aaf7b2fd26c3a069472dd9778367b2f941dd866 (patch) | |
| tree | 3e06b76441ce027300e0fa60620964bc5a0d892b | |
| parent | d8797b125711f23d83f5a71e908d34dfcd1fc3e9 (diff) | |
arm64/insn: add support for emitting ADR/ADRP instructions
Add support for emitting ADR and ADRP instructions so we can switch
over our PLT generation code in a subsequent patch.
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
| -rw-r--r-- | arch/arm64/include/asm/insn.h | 8 | ||||
| -rw-r--r-- | arch/arm64/kernel/insn.c | 29 |
2 files changed, 37 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/insn.h b/arch/arm64/include/asm/insn.h index c6802dea6cab..9c01f04db64d 100644 --- a/arch/arm64/include/asm/insn.h +++ b/arch/arm64/include/asm/insn.h @@ -261,6 +261,11 @@ enum aarch64_insn_prfm_policy { AARCH64_INSN_PRFM_POLICY_STRM, }; +enum aarch64_insn_adr_type { + AARCH64_INSN_ADR_TYPE_ADRP, + AARCH64_INSN_ADR_TYPE_ADR, +}; + #define __AARCH64_INSN_FUNCS(abbr, mask, val) \ static __always_inline bool aarch64_insn_is_##abbr(u32 code) \ { return (code & (mask)) == (val); } \ @@ -393,6 +398,9 @@ u32 aarch64_insn_gen_add_sub_imm(enum aarch64_insn_register dst, enum aarch64_insn_register src, int imm, enum aarch64_insn_variant variant, enum aarch64_insn_adsb_type type); +u32 aarch64_insn_gen_adr(unsigned long pc, unsigned long addr, + enum aarch64_insn_register reg, + enum aarch64_insn_adr_type type); u32 aarch64_insn_gen_bitfield(enum aarch64_insn_register dst, enum aarch64_insn_register src, int immr, int imms, diff --git a/arch/arm64/kernel/insn.c b/arch/arm64/kernel/insn.c index 2b3413549734..7820a4a688fa 100644 --- a/arch/arm64/kernel/insn.c +++ b/arch/arm64/kernel/insn.c @@ -1239,6 +1239,35 @@ u32 aarch64_insn_gen_logical_shifted_reg(enum aarch64_insn_register dst, return aarch64_insn_encode_immediate(AARCH64_INSN_IMM_6, insn, shift); } +u32 aarch64_insn_gen_adr(unsigned long pc, unsigned long addr, + enum aarch64_insn_register reg, + enum aarch64_insn_adr_type type) +{ + u32 insn; + s32 offset; + + switch (type) { + case AARCH64_INSN_ADR_TYPE_ADR: + insn = aarch64_insn_get_adr_value(); + offset = addr - pc; + break; + case AARCH64_INSN_ADR_TYPE_ADRP: + insn = aarch64_insn_get_adrp_value(); + offset = (addr - ALIGN_DOWN(pc, SZ_4K)) >> 12; + break; + default: + pr_err("%s: unknown adr encoding %d\n", __func__, type); + return AARCH64_BREAK_FAULT; + } + + if (offset < -SZ_1M || offset >= SZ_1M) + return AARCH64_BREAK_FAULT; + + insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RD, insn, reg); + + return aarch64_insn_encode_immediate(AARCH64_INSN_IMM_ADR, insn, offset); +} + /* * Decode the imm field of a branch, and return the byte offset as a * signed value (so it can be used when computing a new branch |