Check in the CMakeLists.txt with a custom hook so that the library can build with both compilers regardless.master
Jonathan Protzenko
8 years ago
parent
eaccb3cb4d
commit
63b62e533f
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# This file is no longer auto-generated to make the repository builds with GCC
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# and ARMCC no matter what.
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cmake_minimum_required(VERSION 2.8.11)
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enable_language(ASM)
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set(YOTTA_AUTO_MICROBIT-DAL_CPP_FILES
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"MicroBitSuperMain.cpp"
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"MicroBitI2C.cpp"
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"MicroBitMultiButton.cpp"
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"MicroBitFont.cpp"
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"MicroBit.cpp"
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"MicroBitButton.cpp"
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"MicroBitMessageBus.cpp"
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"MicroBitCompass.cpp"
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"MicroBitEventService.cpp"
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"MicroBitEvent.cpp"
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"MicroBitFiber.cpp"
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"ManagedString.cpp"
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"MicroBitAccelerometer.cpp"
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"MicroBitDFUService.cpp"
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"MicroBitIO.cpp"
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"MicroBitCompat.cpp"
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"MicroBitImage.cpp"
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"MicroBitDisplay.cpp"
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"DynamicPwm.cpp"
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"MicroBitPin.cpp"
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"MicroBitSerial.cpp"
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)
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if(CMAKE_COMPILER_IS_GNUCC)
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set(YOTTA_AUTO_MICROBIT-DAL_S_FILES
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"CortexContextSwitch.s.gcc"
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)
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else()
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set(YOTTA_AUTO_MICROBIT-DAL_S_FILES
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"CortexContextSwitch.s"
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)
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endif()
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add_library(microbit-dal
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${YOTTA_AUTO_MICROBIT-DAL_CPP_FILES}
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${YOTTA_AUTO_MICROBIT-DAL_S_FILES}
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)
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yotta_postprocess_target(LIBRARY microbit-dal)
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target_link_libraries(microbit-dal
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mbed-classic
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ble
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ble-nrf51822
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)
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@ -0,0 +1,187 @@
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.syntax unified
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.cpu cortex-m0
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.thumb
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.text
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.align 2
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@ Export our context switching subroutine as a C function for use in mBed
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.global swap_context
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.global save_context
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@ R0 Contains a pointer to the TCB of the fibre being scheduled out.
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@ R1 Contains a pointer to the TCB of the fibre being scheduled in.
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@ R2 Contains a pointer to the base of the stack of the fibre being scheduled out.
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@ R3 Contains a pointer to the base of the stack of the fibre being scheduled in.
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swap_context:
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@ Write our core registers into the TCB
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@ First, store the general registers
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STR R0, [R0,#0]
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STR R1, [R0,#4]
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STR R2, [R0,#8]
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STR R3, [R0,#12]
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STR R4, [R0,#16]
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STR R5, [R0,#20]
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STR R6, [R0,#24]
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STR R7, [R0,#28]
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@ Now the high general purpose registers
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MOV R4, R8
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STR R4, [R0,#32]
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MOV R4, R9
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STR R4, [R0,#36]
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MOV R4, R10
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STR R4, [R0,#40]
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MOV R4, R11
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STR R4, [R0,#44]
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MOV R4, R12
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STR R4, [R0,#48]
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@ Now the Stack and Link Register.
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@ As this context is only intended for use with a fiber scheduler,
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@ we don't need the PC.
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MOV R6, SP
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STR R6, [R0,#52]
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MOV R4, LR
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STR R4, [R0,#56]
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@ Finally, Copy the stack. We do this to reduce RAM footprint, as stackis usually very small at the point
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@ of sceduling, but we need a lot of capacity for interrupt handling and other functions.
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MOVS R7, #0x20 @ Load R8 with top of System Stack space.
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LSLS R7, #24
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MOVS R4, #0x40
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LSLS R4, #8
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ORRS R7, R4
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MOV R4, R7
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store_stack:
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SUBS R4, #4
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SUBS R2, #4
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LDR R5, [R4]
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STR R5, [R2]
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CMP R4, R6
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BNE store_stack
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@
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@ Now page in the new context.
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@ Update all registers except the PC. We can also safely ignore the STATUS register, as we're just a fiber scheduler.
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@
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LDR R4, [R1, #56]
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MOV LR, R4
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LDR R6, [R1, #52]
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MOV SP, R6
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@ Copy the stack in.
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@ n.b. we do this after setting the SP to make comparisons easier.
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MOV R4, R7 @ Load R4 with top of System Stack space.
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restore_stack:
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SUBS R4, #4
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SUBS R3, #4
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LDR R5, [R3]
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STR R5, [R4]
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CMP R4, R6
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BNE restore_stack
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LDR R4, [R1, #48]
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MOV R12, R4
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LDR R4, [R1, #44]
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MOV R11, R4
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LDR R4, [R1, #40]
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MOV R10, R4
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LDR R4, [R1, #36]
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MOV R9, R4
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LDR R4, [R1, #32]
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MOV R8, R4
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LDR R7, [R1, #28]
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LDR R6, [R1, #24]
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LDR R5, [R1, #20]
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LDR R4, [R1, #16]
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LDR R3, [R1, #12]
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LDR R2, [R1, #8]
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LDR R0, [R1, #0]
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LDR R1, [R1, #4]
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@ Return to caller (scheduler).
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BX LR
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@ R0 Contains a pointer to the TCB of the fibre to snapshot
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@ R1 Contains a pointer to the base of the stack of the fibre being snapshotted
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save_context:
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@ Write our core registers into the TCB
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@ First, store the general registers
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STR R0, [R0,#0]
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STR R1, [R0,#4]
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STR R2, [R0,#8]
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STR R3, [R0,#12]
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STR R4, [R0,#16]
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STR R5, [R0,#20]
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STR R6, [R0,#24]
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STR R7, [R0,#28]
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@ Now the high general purpose registers
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MOV R4, R8
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STR R4, [R0,#32]
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MOV R4, R9
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STR R4, [R0,#36]
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MOV R4, R10
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STR R4, [R0,#40]
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MOV R4, R11
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STR R4, [R0,#44]
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MOV R4, R12
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STR R4, [R0,#48]
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@ Now the Stack and Link Register.
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@ As this context is only intended for use with a fiber scheduler,
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@ we don't need the PC.
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MOV R6, SP
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STR R6, [R0,#52]
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MOV R4, LR
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STR R4, [R0,#56]
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@ Finally, Copy the stack. We do this to reduce RAM footprint, as stackis usually very small at the point
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@ of sceduling, but we need a lot of capacity for interrupt handling and other functions.
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MOVS R5, #0x20 @ Load R8 with top of System Stack space.
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LSLS R5, #24
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MOVS R4, #0x40
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LSLS R4, #8
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ORRS R5, R4
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MOV R4, R5
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store_stack1:
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SUBS R4, #4
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SUBS R1, #4
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LDR R5, [R4]
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STR R5, [R1]
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CMP R4, R6
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BNE store_stack1
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@ Restore scratch registers.
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LDR R7, [R0, #28]
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LDR R6, [R0, #24]
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LDR R5, [R0, #20]
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LDR R4, [R0, #16]
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@ Return to caller (scheduler).
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BX LR
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