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2022-04-26target/nios2: Implement rdprs, wrprsRichard Henderson
Implement these out of line, so that tcg global temps (aka the architectural registers) are synced back to tcg storage as required. This makes sure that we get the proper results when status.PRS == status.CRS. Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20220421151735.31996-55-richard.henderson@linaro.org>
2022-04-26target/nios2: Support division error exceptionRichard Henderson
Division may (optionally) raise a division exception. Since the linux kernel has been prepared for this for some time, enable it by default. Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20220421151735.31996-42-richard.henderson@linaro.org>
2022-04-26target/nios2: Split out helper for eret instructionAmir Gonnen
The implementation of eret will become much more complex with the introduction of shadow registers. [rth: Split out of a larger patch for shadow register sets. Directly exit to the cpu loop from the helper.] Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Amir Gonnen <amir.gonnen@neuroblade.ai> Message-Id: <20220303153906.2024748-3-amir.gonnen@neuroblade.ai> Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20220421151735.31996-18-richard.henderson@linaro.org>
2022-03-03target/nios2: Rewrite interrupt handlingRichard Henderson
Previously, we would avoid setting CPU_INTERRUPT_HARD when interrupts are disabled at a particular point in time, instead queuing the value into cpu->irq_pending. This is more complicated than required. Instead, set CPU_INTERRUPT_HARD any time there is a pending interrupt, and exclusively check for interrupts disabled in nios2_cpu_exec_interrupt. Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
2022-03-03target/nios2: Split mmu_writeRichard Henderson
Create three separate functions for the three separate registers. Avoid extra dispatch through op_helper.c. Dispatch to the correct function in translation. Clean up the ifdefs in wrctl. Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
2022-03-03target/nios2: Remove mmu_read_debugRichard Henderson
This functionality can be had via plugins, if desired. In the meantime, it is unused code. Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
2021-07-30target/nios2: Mark raise_exception() as noreturnPhilippe Mathieu-Daudé
Raised exceptions don't return, so mark the helper with noreturn. Fixes: 032c76bc6f9 ("nios2: Add architecture emulation support") Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20210729101315.2318714-1-f4bug@amsat.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
2017-01-24nios2: Add architecture emulation supportChris Wulff
Add support for emulating Altera NiosII R1 architecture into qemu. This patch is based on previous work by Chris Wulff from 2012 and updated to latest mainline QEMU. Signed-off-by: Marek Vasut <marex@denx.de> Cc: Chris Wulff <crwulff@gmail.com> Cc: Jeff Da Silva <jdasilva@altera.com> Cc: Ley Foon Tan <lftan@altera.com> Cc: Sandra Loosemore <sandra@codesourcery.com> Cc: Yves Vandervennet <yvanderv@altera.com> Cc: Alexander Graf <agraf@suse.de> Message-Id: <20170118220146.489-3-marex@denx.de> [rth: Remove tlb_flush from nios2_cpu_reset.] Signed-off-by: Richard Henderson <rth@twiddle.net>