core: riscv: Remove thread_exit_user_mode()

Currently, the user mode abort and some system calls return to kernel
mode by thread_exit_user_mode(). Although this function creates a
shorter path to re

core: riscv: Remove thread_exit_user_mode()

Currently, the user mode abort and some system calls return to kernel
mode by thread_exit_user_mode(). Although this function creates a
shorter path to return to kernel mode, it leads to some problems because
the function does not update the core local flags. Especially when
CFG_CORE_DEBUG_CHECK_STACKS=y, some checks will fail due to wrong type
of stack recorded in the core local flags.

Fix it by removing thread_exit_user_mode(). So that the core local flags
can be correctly updated in the common trap handler.

Signed-off-by: Alvin Chang <alvinga@andestech.com>
Reviewed-by: Yu Chien Peter Lin <peterlin@andestech.com>

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core: riscv: Apply exception return to handle_user_mode_panic()

Now thread_exit_user_mode() executes exception return to kernel mode.
Invoke xstatus_for_xret() helper function to prepare CSR STATUS

core: riscv: Apply exception return to handle_user_mode_panic()

Now thread_exit_user_mode() executes exception return to kernel mode.
Invoke xstatus_for_xret() helper function to prepare CSR STATUS for
exception return.

Signed-off-by: Alvin Chang <alvinga@andestech.com>
Tested-by: Marouene Boubakri <marouene.boubakri@nxp.com>
Reviewed-by: Marouene Boubakri <marouene.boubakri@nxp.com>

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core: riscv: Update the kernel mode unwinding

The data structure for RISC-V does not have sp, remove it in the
function. Also the function and structure are renamed.

Signed-off-by: Alvin Chang <alv

core: riscv: Update the kernel mode unwinding

The data structure for RISC-V does not have sp, remove it in the
function. Also the function and structure are renamed.

Signed-off-by: Alvin Chang <alvinga@andestech.com>
Reviewed-by: Jerome Forissier <jerome.forissier@linaro.org>
Acked-by: Etienne Carriere <etienne.carriere@foss.st.com>

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core: riscv: provide abort.c

Initial implementation of abort handler for RISC-V.

Signed-off-by: Marouene Boubakri <marouene.boubakri@nxp.com>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>