14 lines
520 B
C
14 lines
520 B
C
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// Perform a system call.
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// Unused parameters should be set to 0.
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int __trap0(unsigned long func, unsigned long p1, unsigned long p2, unsigned long p3)
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{
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int ret = 0;
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asm volatile ("nop\n\tor %%4,%%0,%0" : : "r"(func));
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asm volatile ("nop\n\tor %%5,%%0,%0" : : "r"(p1));
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asm volatile ("nop\n\tor %%6,%%0,%0" : : "r"(p2));
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asm volatile ("nop\n\tor %%7,%%0,%0" : : "r"(p3));
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asm volatile ("nop\n\tor %%11,%%0,%0" : : "r"(func));
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asm volatile ("syscall\n\tnop\n\tor %0,%%0,%%2" : "=r"(ret));
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return ret;
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}
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