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stackframe.h revision 1.2 
      1 /*	$NetBSD: stackframe.h,v 1.2 2010/02/28 15:52:16 snj Exp $	*/
      2 
      3 /*
      4  * Contributed to the NetBSD foundation by Cherry G. Mathew
      5  */
      6 
      7 #define UNW_VER(x)           ((x) >> 48)
      8 #define UNW_FLAG_MASK        0x0000ffff00000000L
      9 #define UNW_FLAG_OSMASK      0x0000f00000000000L
     10 #define UNW_FLAG_EHANDLER(x) ((x) & 0x0000000100000000L)
     11 #define UNW_FLAG_UHANDLER(x) ((x) & 0x0000000200000000L)
     12 #define UNW_LENGTH(x)        ((x) & 0x00000000ffffffffL)
     13 
     14 /* Unwind table entry. */
     15 struct uwtable_ent {
     16 	uint64_t start;
     17 	uint64_t end;
     18 	char *infoptr;
     19 };
     20 
     21 
     22 enum regrecord_type{
     23 	UNSAVED,	/* Register contents live ( and therefore untouched ). */
     24 	IMMED,		/* .offset field is the saved content. */
     25 	BRREL,		/* Register saved in one of the Branch Registers. */
     26 	GRREL,		/* Register saved in one of the Stacked GRs
     27 			 * regstate.offset contains GR number (usually >= 32)
     28 			 */
     29 	SPREL,		/* Register saved on the memory stack frame.
     30 			 * regstate.offset is in words; ie; location == (sp + 4 * spoff).
     31 			 */
     32 	PSPREL		/* Register saved on the memory stack frame but offseted via psp
     33 			 * regstate.offset is in words; ie; location == (psp + 16  4 * pspoff)
     34 			 */
     35 };
     36 
     37 
     38 struct regstate {
     39 	enum regrecord_type where;
     40 	uint64_t when;
     41 
     42 #define INVALID -1UL	/* Indicates uninitialised offset value. */
     43 	uint64_t offset;
     44 };
     45 
     46 
     47 /* A staterecord contains the net state of
     48  * sequentially parsing unwind descriptors.
     49  * The entry state of the current prologue region
     50  * is the exit state of the previous region.
     51  * We record info about registers we care about
     52  * ie; just enough to re-construct an unwind frame,
     53  * and ignore the rest.
     54  * Initial state is where = UNSAVED for all .where fields.
     55  */
     56 
     57 struct staterecord {
     58 	struct regstate bsp;
     59    	struct regstate psp;
     60  	struct regstate rp;
     61  	struct regstate pfs;
     62 };
     63 
     64 /* The unwind frame is a simpler version of the trap frame
     65  * and contains a subset of preserved registers, which are
     66  * useful in unwinding an ia64 stack frame.
     67  * Keep this in sync with the staterecord. See: stackframe.c:updateregs()
     68  */
     69 
     70 struct unwind_frame {
     71 	uint64_t		bsp;	/* Base of the RSE. !!! XXX: Stack Frame discontinuities */
     72 	uint64_t		psp;	/* Mem stack (variable size) base. */
     73 	uint64_t		rp;	/* Return Pointer */
     74 	uint64_t		pfs;	/* Previous Frame size info */
     75 
     76 	/* Don't mirror anything below this line with struct staterecord */
     77 	uint64_t		sp;
     78 };
     79 
     80 
     81 void buildrecordchain(uint64_t, struct recordchain *);
     82 void initrecord(struct staterecord *);
     83 void modifyrecord(struct staterecord *, struct recordchain *, uint64_t);
     84 void pushrecord(struct staterecord *);
     85 void poprecord(struct staterecord *, int);
     86 void dump_staterecord(struct staterecord *);
     87 void clonerecordstack(u_int);
     88 void switchrecordstack(u_int);
     89 
     90 struct uwtable_ent *
     91 get_unwind_table_entry(uint64_t);
     92 void
     93 patchunwindframe(struct unwind_frame *, uint64_t, uint64_t);
     94 void
     95 updateregs(struct unwind_frame *uwf, struct staterecord *, uint64_t) ;
     96 struct uwtable_ent * get_unwind_table_entry(uint64_t ip);
     97 
     98 struct staterecord *
     99 buildrecordstack(struct recordchain *, uint64_t);
    100 void dump_recordchain(struct recordchain *);
    101 
    102 /* Convenience macros to decompose CFM & ar.pfs. */
    103 #define	IA64_CFM_SOF(x)		((x) & 0x7f)
    104 #define	IA64_CFM_SOL(x)		(((x) >> 7) & 0x7f)
    105 #define	IA64_CFM_SOR(x)		(((x) >> 14) & 0x0f)
    106 #define	IA64_CFM_RRB_GR(x)	(((x) >> 18) & 0x7f)
    107 #define	IA64_CFM_RRB_FR(x)	(((x) >> 25) & 0x7f)
    108 #define	IA64_CFM_RRB_PR(x)	(((x) >> 32) & 0x3f)
    109 
    110 #define IA64_RNATINDEX(x)	(((x) & 0x1f8) >> 3)
    111 
    112 /* Obeys Table 6:2 RSE Operation Instructions and State Modification */
    113 
    114 /* These functions adjust for RSE rnat saves to bsp in the forward and
    115  * reverse directions respectively.
    116  */
    117 #define ia64_rnat_adjust ia64_bsp_adjust_call
    118 
    119 static __inline uint64_t
    120 ia64_bsp_adjust_call(uint64_t bsp, int sol)
    121 {
    122 	bsp += ((sol + (IA64_RNATINDEX(bsp) + sol) / 63) << 3);
    123 	return bsp;
    124 }
    125 
    126 static __inline uint64_t
    127 ia64_bsp_adjust_ret(uint64_t bsp, int sol)
    128 {
    129 	bsp -= ((sol + (62 - IA64_RNATINDEX(bsp) + sol) / 63) << 3);
    130 	return bsp;
    131 }
    132 
    133 static __inline uint64_t
    134 ia64_getrse_gr(uint64_t bsp, uint64_t gr)
    135 {
    136 	bsp = ia64_bsp_adjust_call(bsp, gr);
    137 	return *(uint64_t *) bsp;
    138 }
    139