96 lines
1.2 KiB
C
96 lines
1.2 KiB
C
#include "global.h"
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#include "main_inc.h"
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//获取和保存r9寄存器
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void *get_r9(void);
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void set_r9(void *r9);
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//用来保存全局变量基地址
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static void * const g_r9;
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//指向app自身
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static app_struct *g_me;
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//给const类型变量赋值
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static void save_const(void *const_addr, u32 value)
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{
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__asm__ volatile (
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"str %1, [%0]"
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:
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: "r" (const_addr), "r" (value)
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: "memory"
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);
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}
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void *get_r9(void)
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{
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void *result;
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__asm__ volatile (
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"mov %0, r9"
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: "=r" (result)
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:
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:
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);
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return result;
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}
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void set_r9(void *r9_val)
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{
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__asm__ volatile (
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"mov r9, %0"
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:
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: "r" (r9_val)
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: "r9"
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);
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}
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void *global_in(void)
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{
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void *t=get_r9();
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set_r9(g_r9);
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return t;
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}
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void global_out(void *r9)
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{
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set_r9(r9);
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}
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void global_init(app_struct *me)
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{
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void *t=get_r9();
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//使用函数强行赋值
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save_const((void *)&g_r9,(u32)t);
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g_me=me;
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//这个函数提供给系统调用，用以退出app
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extern int __app_exit(void *);
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g_me->exit=__app_exit;
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}
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//app正在运行
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void global_run_start(void)
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{
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if(g_me) g_me->run_state++;
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}
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//app结束运行
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void global_run_exit(void)
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{
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if(g_me)
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{
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if(g_me->run_state) g_me->run_state--;
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}
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}
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