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/* 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 syscall(unsigned syscall_nr, ...);
/* arm-tcc supports only fake asm currently */
__asm__(
".global syscall\n"
"syscall:\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)
#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
}
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