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/*
* This file is subject to the terms of the GFX License. If a copy of
* the license was not distributed with this file, you can obtain one at:
*
* http://ugfx.org/license.html
*/
/**
* Thread Switching Functions for the Cortex M0 & M1
*
* Use the EABI calling standard (ARM's AAPCS) - Save r4 - r11
* The context is saved at the current stack location and a pointer is maintained in the thread structure.
*/
#if CORTEX_USE_FPU
#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"
#endif
#if GFX_COMPILER == GFX_COMPILER_GCC || GFX_COMPILER == GFX_COMPILER_CYGWIN || GFX_COMPILER == GFX_COMPILER_MINGW32 || GFX_COMPILER == GFX_COMPILER_MINGW64
#define GFX_THREADS_DONE
#define _gfxThreadsInit()
static __attribute__((pcs("aapcs"),naked)) void _gfxTaskSwitch(thread *oldt, thread *newt) {
__asm__ volatile ( "push {r4, r5, r6, r7, lr} \n\t"
"mov r4, r8 \n\t"
"mov r5, r9 \n\t"
"mov r6, r10 \n\t"
"mov r7, r11 \n\t"
"push {r4, r5, r6, r7} \n\t"
"str sp, %[oldtcxt] \n\t"
"ldr sp, %[newtcxt] \n\t"
"pop {r4, r5, r6, r7} \n\t"
"mov r8, r4 \n\t"
"mov r9, r5 \n\t"
"mov r10, r6 \n\t"
"mov r11, r7 \n\t"
"pop {r4, r5, r6, r7, pc} \n\t"
: [newtcxt] "=m" (newt->cxt)
: [oldtcxt] "m" (oldt->cxt)
: "memory");
}
static __attribute__((pcs("aapcs"),naked)) void _gfxStartThread(thread *oldt, thread *newt) {
newt->cxt = (char *)newt + newt->size;
__asm__ volatile ( "push {r4, r5, r6, r7, lr} \n\t"
"mov r4, r8 \n\t"
"mov r5, r9 \n\t"
"mov r6, r10 \n\t"
"mov r7, r11 \n\t"
"push {r4, r5, r6, r7} \n\t"
"str sp, %[oldtcxt] \n\t"
"ldr sp, %[newtcxt] \n\t"
: [newtcxt] "=m" (newt->cxt)
: [oldtcxt] "m" (oldt->cxt)
: "memory");
// Run the users function
gfxThreadExit(_gfxCurrentThread->fn(_gfxCurrentThread->param));
}
#elif GFX_COMPILER == GFX_COMPILER_KEIL || GFX_COMPILER == GFX_COMPILER_ARMCC
static __asm void _gfxTaskSwitch(thread *oldt, thread *newt) {
// Save the old context
push {r4, r5, r6, r7, lr}
mov r4, r8
mov r5, r9
mov r6, r10
mov r7, r11
push {r4, r5, r6, r7}
str sp, [r0,#__cpp(offsetof(thread,cxt))] // oldt->cxt
// Load the new context
ldr sp, [r1,#__cpp(offsetof(thread,cxt))] // newt->cxt
pop {r4, r5, r6, r7}
mov r8, r4
mov r9, r5
mov r10, r6
mov r11, r7
pop {r4, r5, r6, r7, pc}
}
static __asm void _gfxStartThread(thread *oldt, thread *newt) {
// Calculate where to generate the new context
// newt->cxt = (char *)newt + newt->size;
ldr r2,[r1,#__cpp(offsetof(thread,size))]
add r2,r2,r1
str r2,[r1,#__cpp(offsetof(thread,cxt))]
// Save the old context
push {r4, r5, r6, r7, lr}
mov r4, r8
mov r5, r9
mov r6, r10
mov r7, r11
push {r4, r5, r6, r7}
str sp, [r0,#__cpp(offsetof(thread,cxt))] // oldt->cxt
// Load the new (imcomplete) context
ldr sp, [r1,#__cpp(offsetof(thread,cxt))] // newt->cxt
// Run the users function - we save some code because gfxThreadExit() never returns
// gfxThreadExit(_gfxCurrentThread->fn(_gfxCurrentThread->param));
LDR r2,__cpp(&_gfxCurrentThread)
LDR r2,[r2,#0]
LDR r0,[r2,#__cpp(offsetof(thread,param))]
LDR r1,[r2,#__cpp(offsetof(thread,fn))]
BLX r1
MOV r4,r0
BL gfxThreadExit
}
#else
#warning "GOS: Threads: You have specified a specific CPU but your compiler is not supported. Defaulting to CLIB switching"
#endif