1 | /* armflush.c - flush the instruction cache
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2 |
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3 | __clear_cache is used in tccrun.c, It is a built-in
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4 | intrinsic with gcc. However tcc in order to compile
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5 | itself needs this function */
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6 |
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7 | #ifdef __TINYC__
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8 |
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9 | /* syscall wrapper */
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10 | unsigned syscall(unsigned syscall_nr, ...);
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11 |
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12 | /* arm-tcc supports only fake asm currently */
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13 | __asm__(
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14 | ".global syscall\n"
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15 | "syscall:\n"
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16 | ".int 0xe92d4080\n" // push {r7, lr}
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17 | ".int 0xe1a07000\n" // mov r7, r0
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18 | ".int 0xe1a00001\n" // mov r0, r1
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19 | ".int 0xe1a01002\n" // mov r1, r2
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20 | ".int 0xe1a02003\n" // mov r2, r3
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21 | ".int 0xef000000\n" // svc 0x00000000
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22 | ".int 0xe8bd8080\n" // pop {r7, pc}
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23 | );
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24 |
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25 | /* from unistd.h: */
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26 | #if defined(__thumb__) || defined(__ARM_EABI__)
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27 | # define __NR_SYSCALL_BASE 0x0
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28 | #else
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29 | # define __NR_SYSCALL_BASE 0x900000
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30 | #endif
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31 | #define __ARM_NR_BASE (__NR_SYSCALL_BASE+0x0f0000)
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32 | #define __ARM_NR_cacheflush (__ARM_NR_BASE+2)
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33 |
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34 | #else
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35 |
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36 | #define _GNU_SOURCE
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37 | #include <unistd.h>
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38 | #include <sys/syscall.h>
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39 | #include <stdio.h>
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40 |
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41 | #endif
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42 |
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43 | /* Flushing for tccrun */
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44 | void __clear_cache(void *beginning, void *end)
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45 | {
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46 | /* __ARM_NR_cacheflush is kernel private and should not be used in user space.
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47 | * However, there is no ARM asm parser in tcc so we use it for now */
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48 | #if 1
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49 | syscall(__ARM_NR_cacheflush, beginning, end, 0);
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50 | #else
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51 | __asm__ ("push {r7}\n\t"
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52 | "mov r7, #0xf0002\n\t"
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53 | "mov r2, #0\n\t"
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54 | "swi 0\n\t"
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55 | "pop {r7}\n\t"
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56 | "ret");
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57 | #endif
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58 | }
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