Blackfin Function Attributes - Using the GNU Compiler Collection (GCC)
Description: Using the GNU Compiler Collection (GCC)

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#### 6.31.6 Blackfin Function Attributes

These function attributes are supported by the Blackfin back end:

`exception_handler`
  Use this attribute on the Blackfin to indicate that the specified function is an exception handler. The compiler generates function entry and exit sequences suitable for use in an exception handler when this attribute is present.
`interrupt_handler`
  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.
`kspisusp`
  When used together with `interrupt_handler`, `exception_handler` or `nmi_handler`, code is generated to load the stack pointer from the USP register in the function prologue.
`l1_text`
  This attribute specifies a function to be placed into L1 Instruction SRAM. The function is put into a specific section named `.l1.text`. With `-mfdpic`, function calls with a such function as the callee or caller uses inlined PLT.
`l2`
  This attribute specifies a function to be placed into L2 SRAM. The function is put into a specific section named `.l2.text`. With `-mfdpic`, callers of such functions use an inlined PLT.
`longcall`
`shortcall`
  The `longcall` attribute indicates that the function might be far away from the call site and require a different (more expensive) calling sequence. The `shortcall` attribute indicates that the function is always close enough for the shorter calling sequence to be used. These attributes override the `-mlongcall` switch.
`nesting`
  Use this attribute together with `interrupt_handler`, `exception_handler` or `nmi_handler` to indicate that the function entry code should enable nested interrupts or exceptions.
`nmi_handler`
  Use this attribute on the Blackfin to indicate that the specified function is an NMI handler. The compiler generates function entry and exit sequences suitable for use in an NMI handler when this attribute is present.
`saveall`
  Use this attribute to indicate that all registers except the stack pointer should be saved in the prologue regardless of whether they are used or not.