diff options
Diffstat (limited to 'gcc/doc/extend.texi')
| -rw-r--r-- | gcc/doc/extend.texi | 22 |
1 files changed, 17 insertions, 5 deletions
diff --git a/gcc/doc/extend.texi b/gcc/doc/extend.texi index 82593b4..b18d8fb 100644 --- a/gcc/doc/extend.texi +++ b/gcc/doc/extend.texi @@ -4090,10 +4090,18 @@ These function attributes are supported by the MIPS back end: @table @code @item interrupt @cindex @code{interrupt} function attribute, MIPS -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. +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. +An optional argument is supported for the interrupt attribute which allows +the interrupt mode to be described. By default GCC assumes the external +interrupt controller (EIC) mode is in use, this can be explicitly set using +@code{eic}. When interrupts are non-masked then the requested Interrupt +Priority Level (IPL) is copied to the current IPL which has the effect of only +enabling higher priority interrupts. To use vectored interrupt mode use +the argument @code{vector=[sw0|sw1|hw0|hw1|hw2|hw3|hw4|hw5]}, this will change +the behaviour of the non-masked interrupt support and GCC will arrange to mask +all interrupts from sw0 up to and including the specified interrupt vector. You can use the following attributes to modify the behavior of an interrupt handler: @@ -4101,7 +4109,9 @@ of an interrupt handler: @item use_shadow_register_set @cindex @code{use_shadow_register_set} function attribute, MIPS Assume that the handler uses a shadow register set, instead of -the main general-purpose registers. +the main general-purpose registers. An optional argument @code{intstack} is +supported to indicate that the shadow register set contains a valid stack +pointer. @item keep_interrupts_masked @cindex @code{keep_interrupts_masked} function attribute, MIPS @@ -4129,6 +4139,8 @@ void __attribute__ ((interrupt, keep_interrupts_masked, void __attribute__ ((interrupt, use_shadow_register_set, keep_interrupts_masked, use_debug_exception_return)) v7 (); +void __attribute__ ((interrupt("eic"))) v8 (); +void __attribute__ ((interrupt("vector=hw3"))) v9 (); @end smallexample @item long_call |