rm48: move some asm file to libcpu

libcpu/arm/cortex-r4/context_gcc.S

+/*
+ * File      : context_ccs.asm
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006, RT-Thread Development Team
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rt-thread.org/license/LICENSE
+ *
+ * Change Logs:
+ * Date       Author       Notes
+ * 2009-01-20     Bernard      first version
+ * 2011-07-22     Bernard      added thumb mode porting
+ * 2013-05-24     Grissiom     port to CCS
+ * 2013-05-26     Grissiom     optimize for ARMv7
+ * 2013-10-20     Grissiom     port to GCC
+ */
+
+#include <rtconfig.h>
+
+   .text
+   .arm
+   .globl rt_thread_switch_interrupt_flag
+   .globl rt_interrupt_from_thread
+   .globl rt_interrupt_to_thread
+   .globl rt_interrupt_enter
+   .globl rt_interrupt_leave
+   .globl rt_hw_trap_irq
+
+/*
+ * rt_base_t rt_hw_interrupt_disable()
+ */
+    .globl rt_hw_interrupt_disable
+rt_hw_interrupt_disable:
+    MRS r0, cpsr
+    CPSID IF
+    BX  lr
+
+/*
+ * void rt_hw_interrupt_enable(rt_base_t level)
+ */
+    .globl rt_hw_interrupt_enable
+rt_hw_interrupt_enable:
+    MSR cpsr_c, r0
+    BX  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:
+    STMDB   sp!, {lr}           @ push pc (lr should be pushed in place of PC)
+    STMDB   sp!, {r0-r12, lr}   @ push lr & register file
+
+    MRS     r4, cpsr
+    TST     lr, #0x01
+    ORRNE   r4, r4, #0x20       @ it's thumb code
+
+    STMDB   sp!, {r4}           @ push cpsr
+
+#if defined (__VFP_FP__) && !defined(__SOFTFP__) && defined(RT_VFP_LAZY_STACKING)
+		VMRS    r4,  fpexc
+        TST     r4,  #0x40000000
+        BEQ     __no_vfp_frame1
+		VSTMDB  sp!, {d0-d15}
+        VMRS    r5, fpscr
+        @ TODO: add support for Common VFPv3.
+        @       Save registers like FPINST, FPINST2
+        STMDB   sp!, {r5}
+__no_vfp_frame1:
+        STMDB   sp!, {r4}
+#endif
+
+    STR     sp, [r0]            @ store sp in preempted tasks TCB
+    LDR     sp, [r1]            @ get new task stack pointer
+
+#if defined (__VFP_FP__) && !defined(__SOFTFP__) && defined(RT_VFP_LAZY_STACKING)
+        LDMIA   sp!, {r0}       @ get fpexc
+        VMSR    fpexc,  r0      @ restore fpexc
+        TST     r0,  #0x40000000
+        BEQ     __no_vfp_frame2
+        LDMIA   sp!, {r1}       @ get fpscr
+        VMSR    fpscr, r1
+		VLDMIA  sp!, {d0-d15}
+__no_vfp_frame2:
+    #endif
+
+    LDMIA   sp!, {r4}           @ pop new task cpsr to spsr
+    MSR     spsr_cxsf, r4
+
+    LDMIA   sp!, {r0-r12, lr, pc}^ @ pop new task r0-r12, lr & pc, copy spsr to cpsr
+
+/*
+ * 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
+
+#if defined (__VFP_FP__) && !defined(__SOFTFP__) && defined(RT_VFP_LAZY_STACKING)
+        LDMIA   sp!, {r0}       @ get fpexc
+        VMSR    fpexc, r0
+        TST     r0,  #0x40000000
+        BEQ     __no_vfp_frame_to
+        LDMIA   sp!, {r1}       @ get fpscr
+        VMSR    fpscr, r1
+		VLDMIA  sp!, {d0-d15}
+__no_vfp_frame_to:
+#endif
+
+    LDMIA   sp!, {r4}           @ pop new task cpsr to spsr
+    MSR     spsr_cxsf, r4
+
+    LDMIA   sp!, {r0-r12, lr, pc}^ @ pop new task r0-r12, lr & pc, copy spsr to cpsr
+
+/*
+ * void rt_hw_context_switch_interrupt(rt_uint32 from, rt_uint32 to)@
+ */
+
+    .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]
+    BX  lr
+
+    .globl IRQ_Handler
+IRQ_Handler:
+    STMDB   sp!, {r0-r12,lr}
+
+#if defined (__VFP_FP__) && !defined(__SOFTFP__) && defined(RT_VFP_LAZY_STACKING)
+		VMRS    r0,  fpexc
+        TST     r0,  #0x40000000
+        BEQ     __no_vfp_frame_str_irq
+		VSTMDB  sp!, {d0-d15}
+        VMRS    r1, fpscr
+        @ TODO: add support for Common VFPv3.
+        @       Save registers like FPINST, FPINST2
+        STMDB   sp!, {r1}
+__no_vfp_frame_str_irq:
+        STMDB   sp!, {r0}
+#endif
+
+    BL  rt_interrupt_enter
+    BL  rt_hw_trap_irq
+    BL  rt_interrupt_leave
+
+    @ if rt_thread_switch_interrupt_flag set, jump to
+    @ rt_hw_context_switch_interrupt_do and don't return
+    LDR r0, =rt_thread_switch_interrupt_flag
+    LDR r1, [r0]
+    CMP r1, #1
+    BEQ rt_hw_context_switch_interrupt_do
+
+#if defined (__VFP_FP__) && !defined(__SOFTFP__) && defined(RT_VFP_LAZY_STACKING)
+        LDMIA   sp!, {r0}       @ get fpexc
+        VMSR    fpexc, r0
+        TST     r0,  #0x40000000
+        BEQ     __no_vfp_frame_ldr_irq
+        LDMIA   sp!, {r1}       @ get fpscr
+        VMSR    fpscr, r1
+		VLDMIA  sp!, {d0-d15}
+__no_vfp_frame_ldr_irq:
+#endif
+
+    LDMIA   sp!, {r0-r12,lr}
+    SUBS    pc, lr, #4
+
+/*
+ * void rt_hw_context_switch_interrupt_do(rt_base_t flag)
+ */
+    .globl rt_hw_context_switch_interrupt_do
+rt_hw_context_switch_interrupt_do:
+    MOV     r1,  #0           @ clear flag
+    STR     r1,  [r0]
+
+#if defined (__VFP_FP__) && !defined(__SOFTFP__) && defined(RT_VFP_LAZY_STACKING)
+        LDMIA   sp!, {r0}       @ get fpexc
+        VMSR    fpexc, r0
+        TST     r0,  #0x40000000
+        BEQ     __no_vfp_frame_do1
+        LDMIA   sp!, {r1}       @ get fpscr
+        VMSR    fpscr, r1
+		VLDMIA  sp!, {d0-d15}
+__no_vfp_frame_do1:
+#endif
+
+    LDMIA   sp!, {r0-r12,lr}  @ reload saved registers
+    STMDB   sp, {r0-r3}       @ save r0-r3. We will restore r0-r3 in the SVC
+                              @ mode so there is no need to update SP.
+    SUB     r1,  sp, #16      @ save the right SP value in r1, so we could restore r0-r3.
+    SUB     r2,  lr, #4       @ save old task's pc to r2
+
+    MRS     r3,  spsr         @ get cpsr of interrupt thread
+
+    @ switch to SVC mode and no interrupt
+    CPSID   IF, #0x13
+
+    STMDB   sp!, {r2}         @ push old task's pc
+    STMDB   sp!, {r4-r12,lr}  @ push old task's lr,r12-r4
+    LDMIA   r1!, {r4-r7}      @ restore r0-r3 of the interrupted thread
+    STMDB   sp!, {r4-r7}      @ push old task's r3-r0. We don't need to push/pop them to
+                              @ r0-r3 because we just want to transfer the data and don't
+                              @ use them here.
+    STMDB   sp!, {r3}         @ push old task's cpsr
+
+#if defined (__VFP_FP__) && !defined(__SOFTFP__) && defined(RT_VFP_LAZY_STACKING)
+		VMRS    r0,  fpexc
+        TST     r0,  #0x40000000
+        BEQ     __no_vfp_frame_do2
+        VSTMDB  sp!, {d0-d15}
+        VMRS    r1, fpscr
+        @ TODO: add support for Common VFPv3.
+        @       Save registers like FPINST, FPINST2
+        STMDB   sp!, {r1}
+__no_vfp_frame_do2:
+        STMDB   sp!, {r0}
+#endif
+
+    LDR     r4,  =rt_interrupt_from_thread
+    LDR     r5,  [r4]
+    STR     sp,  [r5]         @ store sp in preempted tasks's TCB
+
+    LDR     r6,  =rt_interrupt_to_thread
+    LDR     r6,  [r6]
+    LDR     sp,  [r6]         @ get new task's stack pointer
+
+#if defined (__VFP_FP__) && !defined(__SOFTFP__) && defined(RT_VFP_LAZY_STACKING)
+        LDMIA   sp!, {r0}       @ get fpexc
+        VMSR    fpexc, r0
+        TST     r0,  #0x40000000
+        BEQ     __no_vfp_frame_do3
+        LDMIA   sp!, {r1}       @ get fpscr
+        VMSR    fpscr, r1
+		VLDMIA  sp!, {d0-d15}
+__no_vfp_frame_do3:
+#endif
+
+    LDMIA   sp!, {r4}         @ pop new task's cpsr to spsr
+    MSR     spsr_cxsf, r4
+
+    LDMIA   sp!, {r0-r12,lr,pc}^ @ pop new task's r0-r12,lr & pc, copy spsr to cpsr
+