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Floating Point Fun on Cortex-M Processors

Daniel Mangum · published 16 April 2026

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Host
https://arm-software.github.io/psa-api/crypto/1.4/
arm-software.github.io
https://www.nordicsemi.com/Products/nRF52840?ref=0x434b.dev
nordicsemi.com
https://www.espressif.com/en/products/socs/esp32-s3
espressif.com
https://docs.nordicsemi.com/bundle/ps_nrf52840/page/cryptocell.html
docs.nordicsemi.com
https://github.com/nrfconnect/sdk-nrfxlib/tree/529012899ffb2aa8ef69cbbb315eaf2848737aca/crypto/nrf_cc310_mbedcrypto/lib/cortex-m4
github.com
https://developer.arm.com/documentation/107656/0101/Registers/Floating-point-registers/Using-Floating-point-extension/ABI-options
developer.arm.com
https://github.com/ARM-software/abi-aa/blob/main/aapcs32/aapcs32.rst
github.com
https://developer.arm.com/documentation/ddi0403/d/Application-Level-Architecture/Application-Level-Programmers--Model/Coprocessor-support
developer.arm.com
https://developer.arm.com/documentation/ddi0403/d/Application-Level-Architecture/Application-Level-Programmers--Model/The-optional-Floating-point-extension
developer.arm.com
https://developer.arm.com/documentation/ddi0403/d/Application-Level-Architecture/The-ARMv7-M-Instruction-Set/Floating-point-load-and-store-instructions
developer.arm.com
https://developer.arm.com/documentation/ddi0403/d/Application-Level-Architecture/The-ARMv7-M-Instruction-Set/Floating-point-register-transfer-instructions
developer.arm.com
https://developer.arm.com/documentation/ddi0403/d/Application-Level-Architecture/The-ARMv7-M-Instruction-Set/Floating-point-data-processing-instructions
developer.arm.com
https://gcc.gnu.org/onlinedocs/gccint/Soft-float-library-routines.html
gcc.gnu.org
https://github.com/zephyrproject-rtos/zephyr
github.com
https://github.com/zephyrproject-rtos/zephyr/blob/6182bc08c9d72e9e9aed8f5cf05a406fbfd25dd8/arch/Kconfig
github.com
https://github.com/zephyrproject-rtos/zephyr/blob/6182bc08c9d72e9e9aed8f5cf05a406fbfd25dd8/soc/nordic/nrf52/Kconfig
github.com
https://github.com/zephyrproject-rtos/zephyr/blob/6182bc08c9d72e9e9aed8f5cf05a406fbfd25dd8/arch/arm/core/Kconfig
github.com
https://github.com/zephyrproject-rtos/zephyr/blob/c4706d71bc4d265c801877b78840886afc5b91c1/arch/arm/core/cortex_m/prep_c.c
github.com
https://developer.arm.com/documentation/ddi0403/d/System-Level-Architecture/System-Address-Map/System-Control-Space--SCS-/Coprocessor-Access-Control-Register--CPACR
developer.arm.com
https://developer.arm.com/documentation/ddi0403/d/System-Level-Architecture/System-Address-Map/System-Control-Space--SCS-/Floating-Point-Context-Control-Register--FPCCR
developer.arm.com
https://developer.arm.com/documentation/ddi0403/d/System-Level-Architecture/System-Level-Programmers--Model/ARMv7-M-exception-model/Stack-alignment-on-exception-entry
developer.arm.com
https://developer.arm.com/documentation/ddi0403/d/Application-Level-Architecture/Application-Level-Programmers--Model/The-optional-Floating-point-extension/Floating-point-Status-and-Control-Register--FPSCR
developer.arm.com
https://developer.arm.com/documentation/ddi0403/d/System-Level-Architecture/System-Level-Programmers--Model/ARMv7-M-exception-model/Fault-behavior
developer.arm.com
https://developer.arm.com/documentation/101273/0101/Cortex-M55-Processor-level-components-and-system-registers---Reference-Material/System-Control-and-Implementation-Control-Block/Configurable-Fault-Status-Register/UsageFault-Status-Register
developer.arm.com
Elsewhere on danielmangum.com (2)