/* armflush.c - flush the instruction cache    __clear_cache is used in tccrun.c,  It is a built-in   intrinsic with gcc.  However tcc in order to compile   itself needs this function */ #ifdef __TINYC__ /* syscall wrapper */unsigned _tccsyscall(unsigned syscall_nr, ...); /* arm-tcc supports only fake asm currently */__asm__(    ".global _tccsyscall\n"    "_tccsyscall:\n"    ".int 0xe92d4080\n"  // push    {r7, lr}    ".int 0xe1a07000\n"  // mov     r7, r0    ".int 0xe1a00001\n"  // mov     r0, r1    ".int 0xe1a01002\n"  // mov     r1, r2    ".int 0xe1a02003\n"  // mov     r2, r3    ".int 0xef000000\n"  // svc     0x00000000    ".int 0xe8bd8080\n"  // pop     {r7, pc}    ); /* from unistd.h: */#if defined(__thumb__) || defined(__ARM_EABI__)# define __NR_SYSCALL_BASE      0x0#else# define __NR_SYSCALL_BASE      0x900000#endif#define __ARM_NR_BASE           (__NR_SYSCALL_BASE+0x0f0000)#define __ARM_NR_cacheflush     (__ARM_NR_BASE+2) #define syscall _tccsyscall #else #define _GNU_SOURCE#include <unistd.h>#include <sys/syscall.h>#include <stdio.h> #endif /* Flushing for tccrun */void __clear_cache(void *beginning, void *end){/* __ARM_NR_cacheflush is kernel private and should not be used in user space. * However, there is no ARM asm parser in tcc so we use it for now */#if 1    syscall(__ARM_NR_cacheflush, beginning, end, 0);#else    __asm__ ("push {r7}\n\t"             "mov r7, #0xf0002\n\t"             "mov r2, #0\n\t"             "swi 0\n\t"             "pop {r7}\n\t"             "ret");#endif}