arch: riscv: Use CONFIG_PMP_SLOTS for M-mode stack guard arrays #97077
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The arrays used for M-mode Physical Memory Protection (PMP), specifically for the stack guard feature (CONFIG_PMP_STACK_GUARD), were previously sized using the hardcoded PMP_M_MODE_SLOTS macro, defined as 8. This affected arrays in both the _thread_arch struct (m_mode_pmpaddr_regs, m_mode_pmpcfg_regs) and local variables within the z_riscv_pmp_stackguard_disable function. This commit changes the array sizing to use the Kconfig option CONFIG_PMP_SLOTS. This option reflects the total number of PMP slots available and configured for the target hardware. Using CONFIG_PMP_SLOTS ensures these arrays are dimensioned according to the system's actual capabilities, providing better flexibility and correctness over a fixed size. The PMP_M_MODE_SLOTS macro definition has been removed from thread.h as it is no longer used. Signed-off-by: Firas Sammoura <fsammoura@google.com>
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The arrays used for M-mode Physical Memory Protection (PMP), specifically for the stack guard feature (
CONFIG_PMP_STACK_GUARD), were previously sized using the hardcodedPMP_M_MODE_SLOTSmacro, defined as 8. This affected arrays in both the_thread_archstruct (m_mode_pmpaddr_regs,m_mode_pmpcfg_regs) and local variables within thez_riscv_pmp_stackguard_disablefunction.This commit changes the array sizing to use the Kconfig option
CONFIG_PMP_SLOTS. This option reflects the total number of PMP slots available and configured for the target hardware.Using
CONFIG_PMP_SLOTSensures these arrays are dimensioned according to the system's actual capabilities, providing better flexibility and correctness over a fixed size.The
PMP_M_MODE_SLOTSmacro definition has been removed from thread.h as it is no longer used.