File: get_syscall_args.c

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/* Return -1 on error or 1 on success (never 0!). */
static int
get_syscall_args(struct tcb *tcp)
{
	if (tcp->currpers == 1) {
		/*
		 * Zero-extend from 32 bits.
		 * Use widen_to_long(tcp->u_arg[N]) in syscall handlers
		 * if you need to use *sign-extended* parameter.
		 */
		tcp->u_arg[0] = (long) (uint32_t) sparc_regs.u_regs[U_REG_O0 + 0];
		tcp->u_arg[1] = (long) (uint32_t) sparc_regs.u_regs[U_REG_O0 + 1];
		tcp->u_arg[2] = (long) (uint32_t) sparc_regs.u_regs[U_REG_O0 + 2];
		tcp->u_arg[3] = (long) (uint32_t) sparc_regs.u_regs[U_REG_O0 + 3];
		tcp->u_arg[4] = (long) (uint32_t) sparc_regs.u_regs[U_REG_O0 + 4];
		tcp->u_arg[5] = (long) (uint32_t) sparc_regs.u_regs[U_REG_O0 + 5];
	} else {
		tcp->u_arg[0] = sparc_regs.u_regs[U_REG_O0 + 0];
		tcp->u_arg[1] = sparc_regs.u_regs[U_REG_O0 + 1];
		tcp->u_arg[2] = sparc_regs.u_regs[U_REG_O0 + 2];
		tcp->u_arg[3] = sparc_regs.u_regs[U_REG_O0 + 3];
		tcp->u_arg[4] = sparc_regs.u_regs[U_REG_O0 + 4];
		tcp->u_arg[5] = sparc_regs.u_regs[U_REG_O0 + 5];
	}

	return 1;
}