mirror of https://github.com/ARMmbed/mbed-os.git
fb6aa3ef4f
ARM Compiler 6.13 testing revealed linker errors pointing out conflicting use of `__user_setup_stackheap` and `__user_initial_stackheap` in some targets. Remove the unwanted `__user_initial_stackheap` from the targets - the setup is centralised in the common platform code. Looking into this, a number of other issues were highlighted * Almost all targets had `__initial_sp` hardcoded in assembler, rather than getting it from the scatter file. This was behind issue #11313. Fix this generally. * A few targets' `__initial_sp` values did not match the scatter file layout, in some cases meaning they were overlapping heap space. They now all use the area reserved in the scatter file. If any problems are seen, then there is an error in the scatter file. * A number of targets were reserving unneeded space for heap and stack in their startup assembler, on top of the space reserved in the scatter file, so wasting a few K. A couple were using that space for the stack, rather than the space in the scatter file. To clarify expected behaviour: * Each scatter file contains empty regions `ARM_LIB_HEAP` and `ARM_LIB_STACK` to reserve space. `ARM_LIB_STACK` is sized by the macro `MBED_BOOT_STACK_SIZE`, which is set by the tools. `ARM_LIB_HEAP` is generally the space left over after static RAM and stack. * The address of the end of `ARM_LIB_STACK` is written into the vector table and on reset the CPU sets MSP to that address. * The common platform code in Mbed OS provides `__user_setup_stackheap` for the ARM library. The ARM library calls this during startup, and it calls `__mbed_user_setup_stackheap`. * The default weak definition of `__mbed_user_setup_stackheap` does not modify SP, so we remain on the boot stack, and the heap is set to the region described by `ARM_LIB_HEAP`. If `ARM_LIB_HEAP` doesn't exist, then the heap is the space from the end of the used data in `RW_IRAM1` to the start of `ARM_LIB_STACK`. * Targets can override `__mbed_user_setup_stackheap` if they want. Currently only Renesas (ARMv7-A class) devices do. * If microlib is in use, then it doesn't call `__user_setup_stackheap`. Instead it just finds and uses `ARM_LIB_STACK` and `ARM_LIB_HEAP` itself. |
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| .. | ||
| device | ||
| ONBOARD_SARA4_PPP.cpp | ||
| ONBOARD_SARA4_PPP.h | ||
| PeripheralNames.h | ||
| PeripheralPins.c | ||
| PinNames.h | ||
| mtqn_low_power.c | ||
| mtqn_low_power.h | ||
| objects.h | ||
| onboard_modem_api.c | ||
| system_clock.c | ||
| ublox_low_level_api.c | ||
| ublox_low_level_api.h | ||