mirror of
https://github.com/frida/tinycc
synced 2024-12-19 20:02:47 +03:00
59 lines
1.5 KiB
C
59 lines
1.5 KiB
C
|
/* 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
|
||
|
|
}
|