M32R/D Function Attributes#
These function attributes are supported by the M32R/D back end:
- interrupt#
Use this attribute to indicate that the specified function is an interrupt handler. The compiler generates function entry and exit sequences suitable for use in an interrupt handler when this attribute is present.
- model (model-name)#
On the M32R/D, use this attribute to set the addressability of an object, and of the code generated for a function. The identifier
model-name
is one ofsmall
,medium
, orlarge
, representing each of the code models.Small model objects live in the lower 16MB of memory (so that their addresses can be loaded with the
ld24
instruction), and are callable with thebl
instruction.Medium model objects may live anywhere in the 32-bit address space (the compiler generates
seth/add3
instructions to load their addresses), and are callable with thebl
instruction.Large model objects may live anywhere in the 32-bit address space (the compiler generates
seth/add3
instructions to load their addresses), and may not be reachable with thebl
instruction (the compiler generates the much slowerseth/add3/jl
instruction sequence).