support context switch load/store FPU register.

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@1901 bbd45198-f89e-11dd-88c7-29a3b14d5316

libcpu/arm/cortex-m4/context_gcc.S

@@ -10,6 +10,7 @@
  * Change Logs:
  * Date           Author       Notes
  * 2009-10-11     Bernard      first version
+ * 2012-01-01     aozima       support context switch load/store FPU register.
  */
 
 /**
@@ -17,8 +18,8 @@
  */
 /*@{*/
 
-.cpu cortex-m3
-.fpu softvfp
+.cpu cortex-m4
+.fpu vfpv4
 .syntax unified
 .thumb
 .text
@@ -104,7 +105,8 @@ PendSV_Handler:
     CBZ r1, swtich_to_thread    /* skip register save at the first time */
 
     MRS r1, psp                 /* get from thread stack pointer */
-    STMFD   r1!, {r4 - r11}         /* push r4 - r11 register */
+    VSTMDB  r1!, {d8 - d15}     /* push FPU register s16~s31 */
+    STMFD   r1!, {r4 - r11}     /* push r4 - r11 register */
     LDR r0, [r0]
     STR r1, [r0]                /* update from thread stack pointer */
 
@@ -113,7 +115,8 @@ swtich_to_thread:
     LDR r1, [r1]
     LDR r1, [r1]                /* load thread stack pointer */
 
-    LDMFD   r1!, {r4 - r11}         /* pop r4 - r11 register */
+    LDMFD   r1!, {r4 - r11}     /* pop r4 - r11 register */
+    VLDMIA  r1!, {d8 - d15}     /* pop FPU register s16~s31 */
     MSR psp, r1                 /* update stack pointer */
 
 pendsv_exit:

libcpu/arm/cortex-m4/context_iar.S

@@ -11,6 +11,7 @@
 ; * Date           Author       Notes
 ; * 2009-01-17     Bernard      first version
 ; * 2009-09-27     Bernard      add protect when contex switch occurs
+; * 2012-01-01     aozima       support context switch load/store FPU register.
 ; */
 
 ;/**
@@ -102,6 +103,7 @@ PendSV_Handler:
     CBZ     r1, swtich_to_thread    ; skip register save at the first time
 
     MRS     r1, psp                 ; get from thread stack pointer
+    VSTMFD  r1!, {d8 - d15}         ; push FPU register s16~s31
     STMFD   r1!, {r4 - r11}         ; push r4 - r11 register
     LDR     r0, [r0]
     STR     r1, [r0]                ; update from thread stack pointer
@@ -112,6 +114,7 @@ swtich_to_thread
     LDR     r1, [r1]                ; load thread stack pointer
 
     LDMFD   r1!, {r4 - r11}         ; pop r4 - r11 register
+    VLDMFD  r1!, {d8 - d15}         ; pop FPU register s16~s31
     MSR     psp, r1                 ; update stack pointer
 
 pendsv_exit

libcpu/arm/cortex-m4/context_rvds.S

@@ -9,7 +9,8 @@
 ; *
 ; * Change Logs:
 ; * Date           Author       Notes
-; * 2009-01-17     Bernard      first version
+; * 2009-01-17     Bernard      first version.
+; * 2012-01-01     aozima       support context switch load/store FPU register.
 ; */
 
 ;/**
@@ -105,6 +106,7 @@ PendSV_Handler   PROC
     CBZ     r1, swtich_to_thread    ; skip register save at the first time
 
     MRS     r1, psp                 ; get from thread stack pointer
+    VSTMFD  r1!, {d8 - d15}         ; push FPU register s16~s31
     STMFD   r1!, {r4 - r11}         ; push r4 - r11 register
     LDR     r0, [r0]
     STR     r1, [r0]                ; update from thread stack pointer
@@ -115,6 +117,7 @@ swtich_to_thread
     LDR     r1, [r1]                ; load thread stack pointer
 
     LDMFD   r1!, {r4 - r11}         ; pop r4 - r11 register
+    VLDMFD  r1!, {d8 - d15}         ; pop FPU register s16~s31
     MSR     psp, r1                 ; update stack pointer
 
 pendsv_exit

libcpu/arm/cortex-m4/cpuport.c

@@ -1,7 +1,7 @@
 /*
  * File      : cpuport.c
  * This file is part of RT-Thread RTOS
- * COPYRIGHT (C) 2009 - 2011, RT-Thread Development Team
+ * COPYRIGHT (C) 2006 - 2011, RT-Thread Development Team
  *
  * The license and distribution terms for this file may be
  * found in the file LICENSE in this distribution or at
@@ -9,114 +9,195 @@
  *
  * Change Logs:
  * Date           Author       Notes
- * 2006-08-23     Bernard      the first version
- * 2011-06-03     Bernard      merge all of C source code into cpuport.c
- */
+ * 2011-10-21     Bernard      the first version.
+ * 2011-10-27     aozima       update for cortex-M4 FPU.
+ * 2011-12-31     aozima       fixed stack align issues.
+ * 2012-01-01     aozima       support context switch load/store FPU register.
+*/
 #include <rtthread.h>
 
+#define _CPACR (*(rt_uint32_t *)0xE000ED88) /* Coprocessor Access Control Register */
+
 /* exception and interrupt handler table */
 rt_uint32_t rt_interrupt_from_thread, rt_interrupt_to_thread;
 rt_uint32_t rt_thread_switch_interrupt_flag;
 
-struct stack_contex
+struct exception_stack_frame
+{
+    rt_uint32_t r0;
+    rt_uint32_t r1;
+    rt_uint32_t r2;
+    rt_uint32_t r3;
+    rt_uint32_t r12;
+    rt_uint32_t lr;
+    rt_uint32_t pc;
+    rt_uint32_t psr;
+};
+
+struct exception_stack_frame_fpu
 {
-	rt_uint32_t r0;
-	rt_uint32_t r1;
-	rt_uint32_t r2;
-	rt_uint32_t r3;
-	rt_uint32_t r12;
-	rt_uint32_t lr;
-	rt_uint32_t pc;
-	rt_uint32_t psr;
+    rt_uint32_t r0;
+    rt_uint32_t r1;
+    rt_uint32_t r2;
+    rt_uint32_t r3;
+    rt_uint32_t r12;
+    rt_uint32_t lr;
+    rt_uint32_t pc;
+    rt_uint32_t psr;
+
+    /* FPU register */
+    rt_uint32_t S0;
+    rt_uint32_t S1;
+    rt_uint32_t S2;
+    rt_uint32_t S3;
+    rt_uint32_t S4;
+    rt_uint32_t S5;
+    rt_uint32_t S6;
+    rt_uint32_t S7;
+    rt_uint32_t S8;
+    rt_uint32_t S9;
+    rt_uint32_t S10;
+    rt_uint32_t S11;
+    rt_uint32_t S12;
+    rt_uint32_t S13;
+    rt_uint32_t S14;
+    rt_uint32_t S15;
+    rt_uint32_t FPSCR;
+    rt_uint32_t NO_NAME;
 };
 
-struct stack_contex_fpu
+struct stack_frame
 {
-	rt_uint32_t r0;
-	rt_uint32_t r1;
-	rt_uint32_t r2;
-	rt_uint32_t r3;
-	rt_uint32_t r12;
-	rt_uint32_t lr;
-	rt_uint32_t pc;
-	rt_uint32_t psr;
-	/* FPU register */
-	rt_uint32_t S0;
-	rt_uint32_t S1;
-	rt_uint32_t S2;
-	rt_uint32_t S3;
-	rt_uint32_t S4;
-	rt_uint32_t S5;
-	rt_uint32_t S6;
-	rt_uint32_t S7;
-	rt_uint32_t S8;
-	rt_uint32_t S9;
-	rt_uint32_t S10;
-	rt_uint32_t S11;
-	rt_uint32_t S12;
-	rt_uint32_t S13;
-	rt_uint32_t S14;
-	rt_uint32_t S15;
-	rt_uint32_t FPSCR;
-	rt_uint32_t NO_NAME;
+    /* r4 ~ r11 register */
+    rt_uint32_t r4;
+    rt_uint32_t r5;
+    rt_uint32_t r6;
+    rt_uint32_t r7;
+    rt_uint32_t r8;
+    rt_uint32_t r9;
+    rt_uint32_t r10;
+    rt_uint32_t r11;
+
+    struct exception_stack_frame exception_stack_frame;
+};
+
+struct stack_frame_fpu
+{
+    /* r4 ~ r11 register */
+    rt_uint32_t r4;
+    rt_uint32_t r5;
+    rt_uint32_t r6;
+    rt_uint32_t r7;
+    rt_uint32_t r8;
+    rt_uint32_t r9;
+    rt_uint32_t r10;
+    rt_uint32_t r11;
+
+    /* FPU register s16 ~ s31 */
+    rt_uint32_t s16;
+    rt_uint32_t s17;
+    rt_uint32_t s18;
+    rt_uint32_t s19;
+    rt_uint32_t s20;
+    rt_uint32_t s21;
+    rt_uint32_t s22;
+    rt_uint32_t s23;
+    rt_uint32_t s24;
+    rt_uint32_t s25;
+    rt_uint32_t s26;
+    rt_uint32_t s27;
+    rt_uint32_t s28;
+    rt_uint32_t s29;
+    rt_uint32_t s30;
+    rt_uint32_t s31;
+
+    struct exception_stack_frame_fpu exception_stack_frame;
 };
 
 rt_uint8_t *rt_hw_stack_init(void *tentry, void *parameter,
-	rt_uint8_t *stack_addr, void *texit)
+                             rt_uint8_t *stack_addr, void *texit)
 {
-	unsigned long *stk;
-	struct stack_contex_fpu * stack_contex_fpu;
-
-	stk 	 = (unsigned long *)stack_addr + sizeof(rt_uint32_t);
-
-	stk -= sizeof(struct stack_contex_fpu);
-	stack_contex_fpu = (struct stack_contex_fpu *)stk;
-	stack_contex_fpu->r0 = (unsigned long)parameter; /* r0 : argument */
-	stack_contex_fpu->r1 = 0;                        /* r1 */
-	stack_contex_fpu->r2 = 0;                        /* r2 */
-	stack_contex_fpu->r3 = 0;                        /* r3 */
-	stack_contex_fpu->r12 = 0;                       /* r12 */
-	stack_contex_fpu->lr = (unsigned long)texit;     /* lr */
-	stack_contex_fpu->pc = (unsigned long)tentry;    /* entry point, pc */
-	stack_contex_fpu->psr = 0x01000000L;             /* PSR */
-
-	*(--stk) = 0;							/* r11 */
-	*(--stk) = 0;							/* r10 */
-	*(--stk) = 0;							/* r9 */
-	*(--stk) = 0;							/* r8 */
-	*(--stk) = 0;							/* r7 */
-	*(--stk) = 0;							/* r6 */
-	*(--stk) = 0;							/* r5 */
-	*(--stk) = 0;							/* r4 */
-
-	/* return task's current stack address */
-	return (rt_uint8_t *)stk;
+    rt_uint8_t * stk;
+    unsigned long i;
+
+    stk = stack_addr + sizeof(rt_uint32_t);
+
+    /* check FPU enable ? */
+    if((_CPACR & (0xF << 20)) == (0xF << 20))
+    {
+        /* FPU is enable */
+        struct stack_frame_fpu * stack_frame_fpu;
+
+        stk -= sizeof(struct stack_frame_fpu);
+        stack_frame_fpu = (struct stack_frame_fpu *)stk;
+
+        /* init all register */
+        for(i=0; i<sizeof(struct stack_frame_fpu)/sizeof(rt_uint32_t); i++)
+        {
+            ((rt_uint32_t*)stack_frame_fpu)[i] = 0xdeadbeef;
+        }
+
+        stack_frame_fpu->exception_stack_frame.r0 = (unsigned long)parameter; /* r0 : argument */
+        stack_frame_fpu->exception_stack_frame.r1 = 0;                        /* r1 */
+        stack_frame_fpu->exception_stack_frame.r2 = 0;                        /* r2 */
+        stack_frame_fpu->exception_stack_frame.r3 = 0;                        /* r3 */
+        stack_frame_fpu->exception_stack_frame.r12 = 0;                       /* r12 */
+        stack_frame_fpu->exception_stack_frame.lr = (unsigned long)texit;     /* lr */
+        stack_frame_fpu->exception_stack_frame.pc = (unsigned long)tentry;    /* entry point, pc */
+        stack_frame_fpu->exception_stack_frame.psr = 0x01000000L;             /* PSR */
+    }
+    else
+    {
+        /* FPU is disable */
+        struct stack_frame * stack_frame;
+
+        stk -= sizeof(struct stack_frame);
+        stack_frame = (struct stack_frame *)stk;
+
+        /* init all register */
+        for(i=0; i<sizeof(struct stack_frame)/sizeof(rt_uint32_t); i++)
+        {
+            ((rt_uint32_t*)stack_frame)[i] = 0xdeadbeef;
+        }
+
+        stack_frame->exception_stack_frame.r0 = (unsigned long)parameter; /* r0 : argument */
+        stack_frame->exception_stack_frame.r1 = 0;                        /* r1 */
+        stack_frame->exception_stack_frame.r2 = 0;                        /* r2 */
+        stack_frame->exception_stack_frame.r3 = 0;                        /* r3 */
+        stack_frame->exception_stack_frame.r12 = 0;                       /* r12 */
+        stack_frame->exception_stack_frame.lr = (unsigned long)texit;     /* lr */
+        stack_frame->exception_stack_frame.pc = (unsigned long)tentry;    /* entry point, pc */
+        stack_frame->exception_stack_frame.psr = 0x01000000L;             /* PSR */
+    }
+
+    /* return task's current stack address */
+    return stk;
 }
 
 extern void rt_hw_interrupt_thread_switch(void);
 extern void list_thread(void);
 extern rt_thread_t rt_current_thread;
-void rt_hw_hard_fault_exception(struct stack_contex* contex)
+void rt_hw_hard_fault_exception(struct exception_stack_frame * exception_stack)
 {
-	rt_kprintf("psr: 0x%08x\n", contex->psr);
-	rt_kprintf(" pc: 0x%08x\n", contex->pc);
-	rt_kprintf(" lr: 0x%08x\n", contex->lr);
-	rt_kprintf("r12: 0x%08x\n", contex->r12);
-	rt_kprintf("r03: 0x%08x\n", contex->r3);
-	rt_kprintf("r02: 0x%08x\n", contex->r2);
-	rt_kprintf("r01: 0x%08x\n", contex->r1);
-	rt_kprintf("r00: 0x%08x\n", contex->r0);
-
-	rt_kprintf("hard fault on thread: %s\n", rt_current_thread->name);
+    rt_kprintf("psr: 0x%08x\n", exception_stack->psr);
+    rt_kprintf(" pc: 0x%08x\n", exception_stack->pc);
+    rt_kprintf(" lr: 0x%08x\n", exception_stack->lr);
+    rt_kprintf("r12: 0x%08x\n", exception_stack->r12);
+    rt_kprintf("r03: 0x%08x\n", exception_stack->r3);
+    rt_kprintf("r02: 0x%08x\n", exception_stack->r2);
+    rt_kprintf("r01: 0x%08x\n", exception_stack->r1);
+    rt_kprintf("r00: 0x%08x\n", exception_stack->r0);
+
+    rt_kprintf("hard fault on thread: %s\n", rt_current_thread->name);
 #ifdef RT_USING_FINSH
-	list_thread();
+    list_thread();
 #endif
-	while (1);
+    while (1);
 }
 
 void rt_hw_cpu_shutdown()
 {
-	rt_kprintf("shutdown...\n");
+    rt_kprintf("shutdown...\n");
 
-	RT_ASSERT(0);
+    RT_ASSERT(0);
 }