mirror of
https://github.com/frida/tinycc
synced 2024-12-21 04:32:33 +03:00
59 lines
1.5 KiB
C
59 lines
1.5 KiB
C
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/* 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 syscall(unsigned syscall_nr, ...);
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/* arm-tcc supports only fake asm currently */
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__asm__(
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".global syscall\n"
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"syscall:\n"
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".int 0xe92d4080\n" // push {r7, lr}
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".int 0xe1a07000\n" // mov r7, r0
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".int 0xe1a00001\n" // mov r0, r1
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".int 0xe1a01002\n" // mov r1, r2
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".int 0xe1a02003\n" // mov r2, r3
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".int 0xef000000\n" // svc 0x00000000
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".int 0xe8bd8080\n" // 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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#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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#if 1
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syscall(__ARM_NR_cacheflush, beginning, end, 0);
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#else
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__asm__ ("push {r7}\n\t"
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"mov r7, #0xf0002\n\t"
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"mov r2, #0\n\t"
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"swi 0\n\t"
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"pop {r7}\n\t"
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"ret");
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#endif
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}
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