File: ptrace.c

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/* by Miguel de Icaza */
#include <errno.h>
#include <sys/ptrace.h>
#include <sys/syscall.h>

int
ptrace(int request, int pid, int addr, int data)
{
	long ret;
	long res;
	if (request > 0 && request < 4) (long *)data = &ret;

	__asm__ volatile ("or %%g0, %1, %%g1\n\t"
			  "or %%g0, %2, %%o0\n\t"
			  "or %%g0, %3, %%o1\n\t"
			  "or %%g0, %4, %%o2\n\t"
			  "or %%g0, %5, %%o3\n\t"
			  "t 0x10\n\t"
			  "or %%g0, %%o0, %0\n\t"
			  : "=r" (res)
			  : "0" (SYS_ptrace), "r" (request), "r" (pid),
			    "r" (addr), "r" (data)
	                  : "g0", "o0", "o1", "o2", "o3");

	if (res >= 0) {
		if (request > 0 && request < 4) {
			errno = 0;
			return (ret);
		}
		return (int) res;
	}
	errno = -res;
	return -1;
}