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.section ".text"
.globl schedule
// Implicit: SVC Mode
.macro preserve_ctx
cps #0x1f // Sys mode
push {r0-r12, lr} // Restore usr regs
cps #0x10 // Svc mode
ldr r3, =scheduler // struct Scheduler
ldr r3, [r3, #4] // struct Thread* rthread
str lr, [r3, #0] // svc_lr -> void* pc
.endm
.macro restore_ctx
ldr r3, =scheduler // struct Scheduler
ldr r3, [r3, #4] // struct Thread* rthread
ldr lr, [r3, #0] // void* pc -> lr_svc
cps #0x1f // Sys mode
pop {r0-r12,lr} // Restore usr regs
cps #0x10 // Svc mode
.endm
schedule:
//preserve_ctx
//restore_ctx
//bx lr
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