1*55127Storek /* 2*55127Storek * Copyright (c) 1992 The Regents of the University of California. 3*55127Storek * All rights reserved. 4*55127Storek * 5*55127Storek * This software was developed by the Computer Systems Engineering group 6*55127Storek * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 7*55127Storek * contributed to Berkeley. 8*55127Storek * 9*55127Storek * %sccs.include.redist.c% 10*55127Storek * 11*55127Storek * @(#)trap.h 7.1 (Berkeley) 07/13/92 12*55127Storek * 13*55127Storek * from: $Header: trap.h,v 1.8 92/07/03 18:49:02 torek Exp $ 14*55127Storek */ 15*55127Storek 16*55127Storek #ifndef _MACHINE_TRAP_H 17*55127Storek #define _MACHINE_TRAP_H 18*55127Storek /* 19*55127Storek * 20*55127Storek * The SPARC has a Trap Base Register (TBR) which holds the upper 20 bits 21*55127Storek * of the trap vector table. The next eight bits are supplied by the 22*55127Storek * hardware when the trap occurs, and the bottom four bits are always 23*55127Storek * zero (so that we can shove up to 16 bytes of executable code---exactly 24*55127Storek * four instructions---into each trap vector). 25*55127Storek * 26*55127Storek * The hardware allocates half the trap vectors to hardware and half to 27*55127Storek * software. 28*55127Storek * 29*55127Storek * Traps have priorities assigned (lower number => higher priority). 30*55127Storek */ 31*55127Storek 32*55127Storek #if defined(KERNEL) && !defined(LOCORE) 33*55127Storek struct trapvec { 34*55127Storek int tv_instr[4]; /* the four instructions */ 35*55127Storek }; 36*55127Storek extern struct trapvec trapbase[256]; /* the 256 vectors */ 37*55127Storek #endif 38*55127Storek 39*55127Storek /* trap vec (pri) description */ 40*55127Storek #define T_RESET 0x00 /* (1) not actually vectored; jumps to 0 */ 41*55127Storek #define T_TEXTFAULT 0x01 /* (2) address fault during instr fetch */ 42*55127Storek #define T_ILLINST 0x02 /* (3) illegal instruction */ 43*55127Storek #define T_PRIVINST 0x03 /* (4) privileged instruction */ 44*55127Storek #define T_FPDISABLED 0x04 /* (5) fp instr while fp disabled */ 45*55127Storek #define T_WINOF 0x05 /* (6) register window overflow */ 46*55127Storek #define T_WINUF 0x06 /* (7) register window underflow */ 47*55127Storek #define T_ALIGN 0x07 /* (8) address not properly aligned */ 48*55127Storek #define T_FPE 0x08 /* (9) floating point exception */ 49*55127Storek #define T_DATAFAULT 0x09 /* (10) address fault during data fetch */ 50*55127Storek #define T_TAGOF 0x0a /* (11) tag overflow */ 51*55127Storek /* 0x0b unused */ 52*55127Storek /* 0x0c unused */ 53*55127Storek /* 0x0d unused */ 54*55127Storek /* 0x0e unused */ 55*55127Storek /* 0x0f unused */ 56*55127Storek /* 0x10 unused */ 57*55127Storek #define T_L1INT 0x11 /* (27) level 1 interrupt */ 58*55127Storek #define T_L2INT 0x12 /* (26) level 2 interrupt */ 59*55127Storek #define T_L3INT 0x13 /* (25) level 3 interrupt */ 60*55127Storek #define T_L4INT 0x14 /* (24) level 4 interrupt */ 61*55127Storek #define T_L5INT 0x15 /* (23) level 5 interrupt */ 62*55127Storek #define T_L6INT 0x16 /* (22) level 6 interrupt */ 63*55127Storek #define T_L7INT 0x17 /* (21) level 7 interrupt */ 64*55127Storek #define T_L8INT 0x18 /* (20) level 8 interrupt */ 65*55127Storek #define T_L9INT 0x19 /* (19) level 9 interrupt */ 66*55127Storek #define T_L10INT 0x1a /* (18) level 10 interrupt */ 67*55127Storek #define T_L11INT 0x1b /* (17) level 11 interrupt */ 68*55127Storek #define T_L12INT 0x1c /* (16) level 12 interrupt */ 69*55127Storek #define T_L13INT 0x1d /* (15) level 13 interrupt */ 70*55127Storek #define T_L14INT 0x1e /* (14) level 14 interrupt */ 71*55127Storek #define T_L15INT 0x1f /* (13) level 15 interrupt */ 72*55127Storek /* 0x20 unused */ 73*55127Storek /* through 0x23 unused */ 74*55127Storek #define T_CPDISABLED 0x24 /* (5) coprocessor instr while disabled */ 75*55127Storek /* 0x25 unused */ 76*55127Storek /* through 0x27 unused */ 77*55127Storek #define T_CPEXCEPTION 0x28 /* (9) coprocessor exception */ 78*55127Storek /* 0x29 unused */ 79*55127Storek /* through 0x7f unused */ 80*55127Storek 81*55127Storek /* beginning of `user' vectors (from trap instructions) - all priority 12 */ 82*55127Storek #define T_SUN_SYSCALL 0x80 /* system call */ 83*55127Storek #define T_BREAKPOINT 0x81 /* breakpoint `instruction' */ 84*55127Storek #define T_DIV0 0x82 /* division routine was handed 0 */ 85*55127Storek #define T_FLUSHWIN 0x83 /* flush windows */ 86*55127Storek #define T_CLEANWIN 0x84 /* provide clean windows */ 87*55127Storek #define T_RANGECHECK 0x85 /* ? */ 88*55127Storek #define T_FIXALIGN 0x86 /* fix up unaligned accesses */ 89*55127Storek #define T_INTOF 0x87 /* integer overflow ? */ 90*55127Storek #define T_KGDB_EXEC 0x88 /* for kernel gdb */ 91*55127Storek #define T_BSD_SYSCALL 0x89 /* BSD system call */ 92*55127Storek 93*55127Storek /* 0x8a..0xff are currently unallocated */ 94*55127Storek 95*55127Storek #ifdef KERNEL /* pseudo traps for locore.s */ 96*55127Storek #define T_RWRET -1 /* need first user window for trap return */ 97*55127Storek #define T_AST -2 /* no-op, just needed reschedule or profile */ 98*55127Storek #endif 99*55127Storek 100*55127Storek /* flags to system call (flags in %g1 along with syscall number) */ 101*55127Storek #define SYSCALL_G2RFLAG 0x400 /* on success, return to %g2 rather than npc */ 102*55127Storek #define SYSCALL_G7RFLAG 0x800 /* use %g7 as above (deprecated) */ 103*55127Storek 104*55127Storek /* 105*55127Storek * `software trap' macros to keep people happy (sparc v8 manual says not 106*55127Storek * to set the upper bits). 107*55127Storek */ 108*55127Storek #define ST_BREAKPOINT (T_BREAKPOINT & 0x7f) 109*55127Storek #define ST_DIV0 (T_DIV0 & 0x7f) 110*55127Storek #define ST_FLUSHWIN (T_FLUSHWIN & 0x7f) 111*55127Storek #define ST_SYSCALL (T_BSD_SYSCALL & 0x7f) 112*55127Storek 113*55127Storek #endif /* _MACHINE_TRAP_H_ */ 114