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or1k: Allow exception nesting

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Allow exceptions to be nested, which is especially useful with urgent
    interrupts while processing an exception.

    The implementation counts up the nesting level with each call to an
    exception. In the outer exception (level 1), the exception stack is
    started. All nested exceptions just reserve the redzone (scratch
    memory that may be used by compiler) and exception context on the
    stack, but then process on the same scratch.

    Restriction: Impure pointers are shared among all exceptions. This may
    be solved by creating an impure data structure in the stack frame with
    each nested exception.

       * or1k/crt0.S: Add exception nesting
       * or1k/exceptions-asm.S: ditto
       * or1k/util.c: ditto
This commit is contained in:
Jeff Johnston
2015-08-07 14:52:07 -04:00
parent 4098f69c43
commit 31cf34f849
4 changed files with 149 additions and 39 deletions
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14
libgloss/or1k/util.c
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@ -23,8 +23,13 @@
#include "or1k-internals.h"
#ifdef __OR1K_MULTICORE__
// Define pointers to arrays
uint32_t* *_or1k_stack_core;
uint32_t* *_or1k_exception_stack_core;
uint32_t* *_or1k_exception_level;
#else
// Define scalar
uint32_t _or1k_exception_level;
#endif
uint32_t* _or1k_stack_top;
@ -68,6 +73,15 @@ void _or1k_init() {
#else
_or1k_exception_handler_table[6] = _or1k_interrupt_handler;
#endif
#ifdef __OR1K_MULTICORE__
_or1k_exception_level = _sbrk_r(0, 4 * or1k_numcores());
for (c = 0; c < or1k_numcores(); c++) {
_or1k_exception_level[c] = 0;
}
#else
_or1k_exception_level = 0;
#endif
}
uint32_t or1k_critical_begin() {