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问题小结
在完成 rt-thread 代码 Makefile 编译系统搭建…请阅读【嵌入式开发学习必备专栏 】 文章目录 问题小结栈未对齐 经过几天的调试成功将rt-thead 移植到 RA4M2Cortex-M33 核上thread 和 shell 命令已经都成功支持。
问题小结
在完成 rt-thread 代码 Makefile 编译系统搭建后就开始着手 rt-thread OS 的移植不幸的是开始就遇到了问题cortex-m33/context_gcc.S在退出 PendSV_Handler的时候发生了 HardFault_Handler由于没有打印信息也不知道是什么原因导致 hardfault 此外由于很久没有调试Cortex-M系列的core了也不知道去查看哪些寄存器来分析错误原因
栈未对齐
Memory zones:Zone: Default Description: Default access mode
Cortex-M33 identified.
J-Linkh
PC 000002EC, CycleCnt 003535BF
R0 20000C50, R1 20001A28, R2 00000000, R3 00000003
R4 00000000, R5 FFFFFFBC, R6 00000000, R7 00000000
R8 DEADBEEF, R9 DEADBEEF, R10 DEADBEEF, R11 DEADBEEF
R12 00000002
SP(R13) 20000C28, MSP 20000C28, PSP 20001A28, R14(LR) FFFFFFFD
XPSR 2900000E: APSR nzCvQ, EPSR 01000000, IPSR 00E (PendSV)
CFBP 00000000, CONTROL 00, FAULTMASK 00, BASEPRI 00, PRIMASK 00
MSPLIM 20000848
PSPLIM 00000000Security extension regs:
MSP_S 20000C28, MSP_NS 00000000
MSPLIM_S 20000848, MSPLIM_NS 00000000
PSP_S 20001A28, PSP_NS 1F36C7B0
PSPLIM_S 00000000, PSPLIM_NS 00000000
CONTROL_S 00, FAULTMASK_S 00, BASEPRI_S 00, PRIMASK_S 00
CONTROL_NS 00, FAULTMASK_NS 00, BASEPRI_NS 00, PRIMASK_NS 00FPS0 00000000, FPS1 00000000, FPS2 00000000, FPS3 00000000
FPS4 00000000, FPS5 00000000, FPS6 00000000, FPS7 00000000
FPS8 00000000, FPS9 00000000, FPS10 00000000, FPS11 00000000
FPS12 00000000, FPS13 00000000, FPS14 00000000, FPS15 00000000
FPS16 00000000, FPS17 00000000, FPS18 00000000, FPS19 00000000
FPS20 00000000, FPS21 00000000, FPS22 00000000, FPS23 00000000
FPS24 00000000, FPS25 00000000, FPS26 00000000, FPS27 00000000
FPS28 00000000, FPS29 00000000, FPS30 00000000, FPS31 00000000
FPSCR 00000000
J-Linkmem32 0x20001a18 16
20001A18 DEADBEEF DEADBEEF DEADBEEF DEADBEEF
20001A28 DEADBEEF DEADBEEF DEADBEEF DEADBEEF
20001A38 00000000 00000000 00000000 00000000
20001A48 00000000 00000AAD 0000055D 01000000
20001A58 C9EC9E68 000005A9 1F58CD19 ABFBE429
20001A68 1D0D6F06 117A1FBC
J-Linkmem32 0x20001a08 16
20001A08 00000000 FFFFFFBC 00000000 00000000
20001A18 DEADBEEF DEADBEEF DEADBEEF DEADBEEF
20001A28 DEADBEEF DEADBEEF DEADBEEF DEADBEEF
20001A38 00000000 00000000 00000000 00000000
20001A48 00000000 00000AAD 0000055D 01000000
20001A58 C9EC9E68 000005A9
J-Linkcortex-m33/cpuport.c
rt_uint8_t *rt_hw_stack_init(void *tentry,void *parameter,rt_uint8_t *stack_addr,void *texit)
{struct stack_frame *stack_frame;rt_uint8_t *stk;unsigned long i;stk stack_addr sizeof(rt_uint32_t);stk (rt_uint8_t *)RT_ALIGN_DOWN((rt_uint32_t)stk, 8);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 */stack_frame-tz 0x00;stack_frame-lr 0xFFFFFFBC;stack_frame-psplim 0x00;stack_frame-control 0x00;/* return tasks current stack address */return stk;栈结构
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 stack_frame
{rt_uint32_t tz;rt_uint32_t lr;rt_uint32_t psplim;rt_uint32_t control;/* 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;
};具体内容待补充… TODO
