87 lines
3.1 KiB
C
87 lines
3.1 KiB
C
/*
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* This file is subject to the terms of the GFX License. If a copy of
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* the license was not distributed with this file, you can obtain one at:
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*
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* http://ugfx.org/license.html
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*/
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/**
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* Thread Switching Functions for the Cortex M3, M4 & M7 without hardware floating point
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*
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* Use the EABI calling standard (ARM's AAPCS) - Save r4 - r11
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* The context is saved at the current stack location and a pointer is maintained in the thread structure.
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*/
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#if CORTEX_USE_FPU
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#warning "GOS Threads: You have specified GFX_CPU=GFX_CPU_CORTX_M? with no hardware floating point support but CORTEX_USE_FPU is TRUE. Try using GFX_CPU_GFX_CPU_CORTEX_M?_FP instead"
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#endif
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#if GFX_COMPILER == GFX_COMPILER_GCC || GFX_COMPILER == GFX_COMPILER_CYGWIN || GFX_COMPILER == GFX_COMPILER_MINGW32 || GFX_COMPILER == GFX_COMPILER_MINGW64
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#define GFX_THREADS_DONE
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#define _gfxThreadsInit()
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static __attribute__((pcs("aapcs"),naked)) void _gfxTaskSwitch(thread *oldt, thread *newt) {
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__asm__ volatile ( "push {r4, r5, r6, r7, r8, r9, r10, r11, lr} \n\t"
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"str sp, %[oldtcxt] \n\t"
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"ldr sp, %[newtcxt] \n\t"
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"pop {r4, r5, r6, r7, r8, r9, r10, r11, pc} \n\t"
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: [newtcxt] "=m" (newt->cxt)
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: [oldtcxt] "m" (oldt->cxt)
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: "memory");
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}
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static __attribute__((pcs("aapcs"),naked)) void _gfxStartThread(thread *oldt, thread *newt) {
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newt->cxt = (char *)newt + newt->size;
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__asm__ volatile ( "push {r4, r5, r6, r7, r8, r9, r10, r11, lr} \n\t"
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"str sp, %[oldtcxt] \n\t"
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"ldr sp, %[newtcxt] \n\t"
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: [newtcxt] "=m" (newt->cxt)
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: [oldtcxt] "m" (oldt->cxt)
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: "memory");
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// Run the users function
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gfxThreadExit(_gfxCurrentThread->fn(_gfxCurrentThread->param));
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}
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#elif GFX_COMPILER == GFX_COMPILER_KEIL || GFX_COMPILER == GFX_COMPILER_ARMCC
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static __asm void _gfxTaskSwitch(thread *oldt, thread *newt) {
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// Save the old context
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push {r4, r5, r6, r7, r8, r9, r10, r11, lr}
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str sp, [r0,#__cpp(offsetof(thread,cxt))] // oldt->cxt
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// Load the new context
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ldr sp, [r1,#__cpp(offsetof(thread,cxt))] // newt->cxt
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pop {r4, r5, r6, r7, r8, r9, r10, r11, pc}
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}
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static __asm void _gfxStartThread(thread *oldt, thread *newt) {
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// Calculate where to generate the new context
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// newt->cxt = (char *)newt + newt->size;
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ldr r2,[r1,#__cpp(offsetof(thread,size))]
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add r2,r2,r1
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str r2,[r1,#__cpp(offsetof(thread,cxt))]
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// Save the old context
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push {r4, r5, r6, r7, r8, r9, r10, r11, lr}
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str sp, [r0,#__cpp(offsetof(thread,cxt))] // oldt->cxt
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// Load the new (imcomplete) context
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ldr sp, [r1,#__cpp(offsetof(thread,cxt))] // newt->cxt
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// Run the users function - we save some code because gfxThreadExit() never returns
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// gfxThreadExit(_gfxCurrentThread->fn(_gfxCurrentThread->param));
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ldr r2,__cpp(&_gfxCurrentThread)
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ldr r2,[r2,#0]
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ldr r0,[r2,#__cpp(offsetof(thread,param))]
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ldr r1,[r2,#__cpp(offsetof(thread,fn))]
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blx r1
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mov r4,r0
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bl __cpp(gfxThreadExit)
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}
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#else
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#warning "GOS: Threads: You have specified a specific CPU but your compiler is not supported. Defaulting to CLIB switching"
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#endif
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