1*47ae93cdSMichael Clark #define xRA 1 /* return address (aka link register) */ 2*47ae93cdSMichael Clark #define xSP 2 /* stack pointer */ 3*47ae93cdSMichael Clark #define xGP 3 /* global pointer */ 4*47ae93cdSMichael Clark #define xTP 4 /* thread pointer */ 5*47ae93cdSMichael Clark 6*47ae93cdSMichael Clark #define xA0 10 /* gpr[10-17] are syscall arguments */ 7*47ae93cdSMichael Clark #define xA1 11 8*47ae93cdSMichael Clark #define xA2 12 9*47ae93cdSMichael Clark #define xA3 13 10*47ae93cdSMichael Clark #define xA4 14 11*47ae93cdSMichael Clark #define xA5 15 12*47ae93cdSMichael Clark #define xA6 16 13*47ae93cdSMichael Clark #define xA7 17 /* syscall number goes here */ 14