long_shift_insn_t Struct Reference

One decoded immediate-or-register Armv8.1-M long shift. More...

Data Fields
uint32_t	rdalo
	Low destination register index (even).
uint32_t	rdahi
	High destination register index.
uint32_t	op
	k_lsh_op_lsll / _lsrl / _asrl.
bool	by_reg
	true when the amount comes from rm.
uint32_t	rm
	Register holding the amount (register form only).
uint32_t	imm
	Shift amount 1..32 (immediate form only).

Detailed Description

One decoded immediate-or-register Armv8.1-M long shift.

Produced by internal_long_shift_decode and consumed by internal_long_shift_begin. The register form carries the shift amount in a register that can only be read once the core is at the instruction, so the amount is resolved separately by internal_long_shift_amount rather than being decoded here.

Invariant

rdalo is even; rdahi is never 0b1111.

Exactly one of by_reg / immediate use is meaningful: when by_reg is false imm holds the amount, otherwise rm names the register that does.

See also

internal_long_shift_decode

Definition at line 133 of file emu_seam_longshift.c.

Field Documentation

by_reg

bool long_shift_insn_t::by_reg

true when the amount comes from rm.

Definition at line 137 of file emu_seam_longshift.c.

Referenced by emulate_long_shift_reg(), internal_install_seg_hooks(), internal_long_shift_amount(), and internal_long_shift_decode().

imm

uint32_t long_shift_insn_t::imm

Shift amount 1..32 (immediate form only).

Definition at line 139 of file emu_seam_longshift.c.

Referenced by internal_long_shift_amount(), and internal_long_shift_decode().

op

uint32_t long_shift_insn_t::op

k_lsh_op_lsll / _lsrl / _asrl.

Definition at line 136 of file emu_seam_longshift.c.

Referenced by emulate_long_shift_reg(), internal_long_shift_begin(), and internal_long_shift_decode().

rdahi

uint32_t long_shift_insn_t::rdahi

High destination register index.

Definition at line 135 of file emu_seam_longshift.c.

Referenced by emulate_long_shift_reg(), and internal_long_shift_begin().

rdalo

uint32_t long_shift_insn_t::rdalo

Low destination register index (even).

Definition at line 134 of file emu_seam_longshift.c.

Referenced by emulate_long_shift_reg(), and internal_long_shift_begin().

rm

uint32_t long_shift_insn_t::rm

Register holding the amount (register form only).

Definition at line 138 of file emu_seam_longshift.c.

Referenced by internal_long_shift_amount(), and internal_long_shift_decode().

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The documentation for this struct was generated from the following file:

• tools/ra8_emulator/src/engine/emu_seam_longshift.c