coretex M33 register save.

typedef struct MY_REG{

unsigned long r0;

unsigned long r1;

unsigned long r2;

unsigned long r3;

unsigned long r4;

unsigned long r5;

unsigned long r6;

unsigned long r7;

unsigned long r8;

unsigned long r9;

unsigned long r10;

unsigned long r11;

unsigned long r12;

unsigned long r13;

unsigned long r14;

unsigned long r15; // PC

}MY_REG;

MY_REG my_reg_save;

void save_reg_data(MY_REG *save_reg)

{

asm volatile(

“str r0, [%0, #0]\n\t” /* R0 push to save_reg */

“mov r0, %0\n\t” /* R0 */

“str r1, [r0,#4]\n\t” /* R1 */

“str r2, [r0,#8]\n\t” /* R2 */

“str r3, [r0,#12]\n\t” /* R3 */

“str r4, [r0,#16]\n\t” /* R4 */

“str r5, [r0,#20]\n\t” /* R5 */

“str r6, [r0,#24]\n\t” /* R6 */

“str r7, [r0,#28]\n\t” /* R7 */

“str r8, [r0,#32]\n\t” /* R8 */

“str r9, [r0,#36]\n\t” /* R9 */

“str r10, [r0,#40]\n\t” /* R10 */

“str r11, [r0,#44]\n\t” /* R11 */

“str r12, [r0,#48]\n\t” /* R12 */

“str r13, [r0,#52]\n\t” /* R13 - SP */

“str r14, [r0,#56]\n\t” /* R14 - LR*/

“sub r1, r15, #0x30\n\t” /* PC */

“str r1, [r0,#60]\n\t”

“mrs r1, xpsr\n\t” /* xPSR */

“str r1, [r0,#64]\n\t”

//output

:”r”(save_reg) //input

:”%r0”,”%r1” //chnanged value

);

}

/*

inline volatile asm funcion.

1. asm

2. output

3. input

4. changed value

example : asm volatile(“asm code” : output value : input value : changed value);

int test_asm_volatile(int input)

{

int output;

asm volatile(“str r0, [%0]\n\t”, output: “r”(input):”%r0”);

}

*/

참고

http://jake.dothome.co.kr/inline-assembly/

http://www.ethernut.de/en/documents/arm-inline-asm.html

https://toanyone.net/arm-inline-asm

https://wiki.kldp.org/KoreanDoc/html/EmbeddedKernel-KLDP/app3.basic.html

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