Recognize C11' _Alignof
[tinycc.git] / lib / armflush.c
blobeae32605f24190f78da2989ec383b6040bd2b122
1 /* armflush.c - flush the instruction cache
3 __clear_cache is used in tccrun.c, It is a built-in
4 intrinsic with gcc. However tcc in order to compile
5 itself needs this function */
7 #ifdef __TINYC__
9 /* syscall wrapper */
10 unsigned syscall(unsigned syscall_nr, ...);
12 /* arm-tcc supports only fake asm currently */
13 __asm__(
14 ".global syscall\n"
15 "syscall:\n"
16 ".int 0xe92d4080\n" // push {r7, lr}
17 ".int 0xe1a07000\n" // mov r7, r0
18 ".int 0xe1a00001\n" // mov r0, r1
19 ".int 0xe1a01002\n" // mov r1, r2
20 ".int 0xe1a02003\n" // mov r2, r3
21 ".int 0xef000000\n" // svc 0x00000000
22 ".int 0xe8bd8080\n" // pop {r7, pc}
25 /* from unistd.h: */
26 #if defined(__thumb__) || defined(__ARM_EABI__)
27 # define __NR_SYSCALL_BASE 0x0
28 #else
29 # define __NR_SYSCALL_BASE 0x900000
30 #endif
31 #define __ARM_NR_BASE (__NR_SYSCALL_BASE+0x0f0000)
32 #define __ARM_NR_cacheflush (__ARM_NR_BASE+2)
34 #else
36 #define _GNU_SOURCE
37 #include <unistd.h>
38 #include <sys/syscall.h>
39 #include <stdio.h>
41 #endif
43 /* Flushing for tccrun */
44 void __clear_cache(void *beginning, void *end)
46 /* __ARM_NR_cacheflush is kernel private and should not be used in user space.
47 * However, there is no ARM asm parser in tcc so we use it for now */
48 #if 1
49 syscall(__ARM_NR_cacheflush, beginning, end, 0);
50 #else
51 __asm__ ("push {r7}\n\t"
52 "mov r7, #0xf0002\n\t"
53 "mov r2, #0\n\t"
54 "swi 0\n\t"
55 "pop {r7}\n\t"
56 "ret");
57 #endif