RT-Thread_v4.1.1

libcpu/arm/AT91SAM7S/context_gcc.S

@@ -0,0 +1,90 @@
+/*
+ * Copyright (c) 2006-2022, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2006-03-13     Bernard      first version
+ */
+
+#define NOINT           0xc0
+
+/*
+ * rt_base_t rt_hw_interrupt_disable()/*
+ */
+.globl rt_hw_interrupt_disable
+rt_hw_interrupt_disable:
+    mrs r0, cpsr
+    orr r1, r0, #NOINT
+    msr cpsr_c, r1
+    mov pc, lr
+
+/*
+ * void rt_hw_interrupt_enable(rt_base_t level)/*
+ */
+.globl rt_hw_interrupt_enable
+rt_hw_interrupt_enable:
+    msr cpsr, r0
+    mov pc, lr
+
+/*
+ * void rt_hw_context_switch(rt_uint32 from, rt_uint32 to)/*
+ * r0 --> from
+ * r1 --> to
+ */
+.globl rt_hw_context_switch
+rt_hw_context_switch:
+    stmfd   sp!, {lr}           /* push pc (lr should be pushed in place of PC) */
+    stmfd   sp!, {r0-r12, lr}   /* push lr & register file */
+
+    mrs     r4, cpsr
+    stmfd   sp!, {r4}           /* push cpsr */
+    mrs     r4, spsr
+    stmfd   sp!, {r4}           /* push spsr */
+
+    str     sp, [r0]            /* store sp in preempted tasks TCB */
+    ldr     sp, [r1]            /* get new task stack pointer */
+
+    ldmfd   sp!, {r4}           /* pop new task spsr */
+    msr     spsr_cxsf, r4
+    ldmfd   sp!, {r4}           /* pop new task cpsr */
+    msr     cpsr_cxsf, r4
+
+    ldmfd   sp!, {r0-r12, lr, pc}   /* pop new task r0-r12, lr & pc */
+
+/*
+ * void rt_hw_context_switch_to(rt_uint32 to)/*
+ * r0 --> to
+ */
+.globl rt_hw_context_switch_to
+rt_hw_context_switch_to:
+    ldr     sp, [r0]            /* get new task stack pointer */
+
+    ldmfd   sp!, {r4}           /* pop new task spsr */
+    msr     spsr_cxsf, r4
+    ldmfd   sp!, {r4}           /* pop new task cpsr */
+    msr     cpsr_cxsf, r4
+
+    ldmfd   sp!, {r0-r12, lr, pc}   /* pop new task r0-r12, lr & pc */
+
+/*
+ * void rt_hw_context_switch_interrupt(rt_uint32 from, rt_uint32 to)/*
+ */
+.globl rt_thread_switch_interrupt_flag
+.globl rt_interrupt_from_thread
+.globl rt_interrupt_to_thread
+.globl rt_hw_context_switch_interrupt
+rt_hw_context_switch_interrupt:
+    ldr     r2, =rt_thread_switch_interrupt_flag
+    ldr     r3, [r2]
+    cmp     r3, #1
+    beq     _reswitch
+    mov     r3, #1                          /* set rt_thread_switch_interrupt_flag to 1 */
+    str     r3, [r2]
+    ldr     r2, =rt_interrupt_from_thread   /* set rt_interrupt_from_thread */
+    str     r0, [r2]
+_reswitch:
+    ldr     r2, =rt_interrupt_to_thread     /* set rt_interrupt_to_thread */
+    str     r1, [r2]
+    mov     pc, lr