Crate bracer

Various macros to help write inline assembly for ARM targets.

These macros help you get your assembly written, but they have nearly no ability to help ensure that your assembly is correct. In rare cases where something can be statically known to be “obviously” wrong (eg: an invalid register name is picked for a specific instruction) the macro will panic.

Macros

a32_fake_blx

ARMv4T lacks the actual blx instruction, so this performs a “fake” blx-styled operation.

a32_read_spsr_to

Reads SPSR to the register given.

a32_set_cpu_control

Generates the asm string to set the CPU control bits.

a32_write_spsr_from

Writes SPSR from the register given.

put_fn_in_section

Emits a .section directive to place the code in a section name you pick.

t32_with_a32_scope

Places .code 32 at the start and .code 16 at the end of the input sequence.

when

Emits code that will perform the test and skip past some lines if the test does not pass.