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