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2014-09-25arm64: insn: Add return statements after BUG_ON()Mark Brown1-0/+25
Following a recent series of enhancements to the insn code the ARMv8 allnoconfig build has been generating a large number of warnings in the form of: arch/arm64/kernel/insn.c:689:8: warning: 'insn' may be used uninitialized in this function [-Wmaybe-uninitialized] This is because BUG() and related macros can be compiled out so we get execution paths which normally result in a panic compiling out to noops instead. I wasn't able to immediately identify a sensible return value to use in these cases so just return AARCH64_BREAK_FAULT - this is all "should never happen" code so hopefully it never has a practical impact. Signed-off-by: Mark Brown <broonie@kernel.org> [catalin.marinas@arm.com: AARCH64_BREAK_FAULT definition contributed by Daniel Borkmann] [catalin.marinas@arm.com: replace return 0 with AARCH64_BREAK_FAULT] Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2014-09-08arm64: introduce aarch64_insn_gen_logical_shifted_reg()Zi Shen Lim1-0/+60
Introduce function to generate logical (shifted 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>
2014-09-08arm64: introduce aarch64_insn_gen_data3()Zi Shen Lim1-0/+42
Introduce function to generate data-processing (3 source) 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>
2014-09-08arm64: introduce aarch64_insn_gen_data2()Zi Shen Lim1-0/+48
Introduce function to generate data-processing (2 source) 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>
2014-09-08arm64: introduce aarch64_insn_gen_data1()Zi Shen Lim1-0/+37
Introduce function to generate data-processing (1 source) 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>
2014-09-08arm64: introduce aarch64_insn_gen_add_sub_shifted_reg()Zi Shen Lim1-0/+49
Introduce function to generate add/subtract (shifted 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>
2014-09-08arm64: introduce aarch64_insn_gen_movewide()Zi Shen Lim1-0/+43
Introduce function to generate move wide (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>
2014-09-08arm64: introduce aarch64_insn_gen_bitfield()Zi Shen Lim1-0/+56
Introduce function to generate bitfield 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>
2014-09-08arm64: introduce aarch64_insn_gen_add_sub_imm()Zi Shen Lim1-0/+44
Introduce function to generate add/subtract (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>
2014-09-08arm64: introduce aarch64_insn_gen_load_store_pair()Zi Shen Lim1-0/+65
Introduce function to generate load/store pair 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>
2014-09-08arm64: introduce aarch64_insn_gen_load_store_reg()Zi Shen Lim1-0/+62
Introduce function to generate load/store (register offset) 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>
2014-09-08arm64: introduce aarch64_insn_gen_cond_branch_imm()Zi Shen Lim1-0/+17
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>
2014-09-08arm64: introduce aarch64_insn_gen_branch_reg()Zi Shen Lim1-2/+33
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>
2014-09-08arm64: introduce aarch64_insn_gen_comp_branch_imm()Zi Shen Lim1-5/+83
Introduce function to generate compare & 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>
2014-01-08arm64: introduce aarch64_insn_gen_{nop|branch_imm}() helper functionsJiang Liu1-0/+40
Introduce aarch64_insn_gen_{nop|branch_imm}() helper functions, which will be used to implement jump label on ARM64. Reviewed-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Jiang Liu <liuj97@gmail.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2014-01-08arm64: move encode_insn_immediate() from module.c to insn.cJiang Liu1-0/+54
Function encode_insn_immediate() will be used by other instruction manipulate related functions, so move it into insn.c and rename it as aarch64_insn_encode_immediate(). Reviewed-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Jiang Liu <liuj97@gmail.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2014-01-08arm64: introduce interfaces to hotpatch kernel and module codeJiang Liu1-0/+119
Introduce three interfaces to patch kernel and module code: aarch64_insn_patch_text_nosync(): patch code without synchronization, it's caller's responsibility to synchronize all CPUs if needed. aarch64_insn_patch_text_sync(): patch code and always synchronize with stop_machine() aarch64_insn_patch_text(): patch code and synchronize with stop_machine() if needed Reviewed-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Jiang Liu <liuj97@gmail.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2014-01-08arm64: introduce basic aarch64 instruction decoding helpersJiang Liu1-0/+91
Introduce basic aarch64 instruction decoding helper aarch64_get_insn_class() and aarch64_insn_hotpatch_safe(). Reviewed-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Jiang Liu <liuj97@gmail.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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