fd4e66499c
This commit re-implements the SPARC V8 ABI "Flush windows" software trap. The trap is generated by C++ compilers for exceptions and also by the C standard library function longjmp(). There were two issues with the previous implementation: 1. It did reads and writes via the stack pointer of the trap window, which is not defined. 2. It executed with traps enabled but without the processor run-time state set to safely handle traps. In particular there was no valid stack for trap processing. Even though interrupt priority was set to highest level, the behavior at other traps was not deterministic. For example non-maskable interrupt (15) trap or bus error trap for instruction fetch. This new implementation does not store backup copies of CPU registers to the stack, and it executes with traps disabled. Fixes #63901 Signed-off-by: Martin Åberg <martin.aberg@gaisler.com> |
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| CMakeLists.txt | ||
| Kconfig | ||