kernel/entry.S [203:212]:
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	callr	r1

	/* If the syscall returns a negative result:
	 *   Set r7 to 1 to indicate error,
	 *   Negate r2 to get a positive error code
	 * If the syscall returns zero or a positive value:
	 *   Set r7 to 0.
	 * The sigreturn system calls will skip the code below by
	 * adding to register ra. To avoid destroying registers
	 */
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kernel/entry.S [266:275]:
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	callr	r1

	/* If the syscall returns a negative result:
	 *   Set r7 to 1 to indicate error,
	 *   Negate r2 to get a positive error code
	 * If the syscall returns zero or a positive value:
	 *   Set r7 to 0.
	 * The sigreturn system calls will skip the code below by
	 * adding to register ra. To avoid destroying registers
	 */
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