cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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unwind_i.h (5821B)


      1/* SPDX-License-Identifier: GPL-2.0 */
      2/*
      3 * Copyright (C) 2000, 2002-2003 Hewlett-Packard Co
      4 *	David Mosberger-Tang <davidm@hpl.hp.com>
      5 *
      6 * Kernel unwind support.
      7 */
      8
      9#define UNW_VER(x)		((x) >> 48)
     10#define UNW_FLAG_MASK		0x0000ffff00000000
     11#define UNW_FLAG_OSMASK		0x0000f00000000000
     12#define UNW_FLAG_EHANDLER(x)	((x) & 0x0000000100000000L)
     13#define UNW_FLAG_UHANDLER(x)	((x) & 0x0000000200000000L)
     14#define UNW_LENGTH(x)		((x) & 0x00000000ffffffffL)
     15
     16enum unw_register_index {
     17	/* primary unat: */
     18	UNW_REG_PRI_UNAT_GR,
     19	UNW_REG_PRI_UNAT_MEM,
     20
     21	/* register stack */
     22	UNW_REG_BSP,					/* register stack pointer */
     23	UNW_REG_BSPSTORE,
     24	UNW_REG_PFS,					/* previous function state */
     25	UNW_REG_RNAT,
     26	/* memory stack */
     27	UNW_REG_PSP,					/* previous memory stack pointer */
     28	/* return pointer: */
     29	UNW_REG_RP,
     30
     31	/* preserved registers: */
     32	UNW_REG_R4, UNW_REG_R5, UNW_REG_R6, UNW_REG_R7,
     33	UNW_REG_UNAT, UNW_REG_PR, UNW_REG_LC, UNW_REG_FPSR,
     34	UNW_REG_B1, UNW_REG_B2, UNW_REG_B3, UNW_REG_B4, UNW_REG_B5,
     35	UNW_REG_F2, UNW_REG_F3, UNW_REG_F4, UNW_REG_F5,
     36	UNW_REG_F16, UNW_REG_F17, UNW_REG_F18, UNW_REG_F19,
     37	UNW_REG_F20, UNW_REG_F21, UNW_REG_F22, UNW_REG_F23,
     38	UNW_REG_F24, UNW_REG_F25, UNW_REG_F26, UNW_REG_F27,
     39	UNW_REG_F28, UNW_REG_F29, UNW_REG_F30, UNW_REG_F31,
     40	UNW_NUM_REGS
     41};
     42
     43struct unw_info_block {
     44	u64 header;
     45	u64 desc[];		/* unwind descriptors */
     46	/* personality routine and language-specific data follow behind descriptors */
     47};
     48
     49struct unw_table {
     50	struct unw_table *next;		/* must be first member! */
     51	const char *name;
     52	unsigned long gp;		/* global pointer for this load-module */
     53	unsigned long segment_base;	/* base for offsets in the unwind table entries */
     54	unsigned long start;
     55	unsigned long end;
     56	const struct unw_table_entry *array;
     57	unsigned long length;
     58};
     59
     60enum unw_where {
     61	UNW_WHERE_NONE,			/* register isn't saved at all */
     62	UNW_WHERE_GR,			/* register is saved in a general register */
     63	UNW_WHERE_FR,			/* register is saved in a floating-point register */
     64	UNW_WHERE_BR,			/* register is saved in a branch register */
     65	UNW_WHERE_SPREL,		/* register is saved on memstack (sp-relative) */
     66	UNW_WHERE_PSPREL,		/* register is saved on memstack (psp-relative) */
     67	/*
     68	 * At the end of each prologue these locations get resolved to
     69	 * UNW_WHERE_PSPREL and UNW_WHERE_GR, respectively:
     70	 */
     71	UNW_WHERE_SPILL_HOME,		/* register is saved in its spill home */
     72	UNW_WHERE_GR_SAVE		/* register is saved in next general register */
     73};
     74
     75#define UNW_WHEN_NEVER	0x7fffffff
     76
     77struct unw_reg_info {
     78	unsigned long val;		/* save location: register number or offset */
     79	enum unw_where where;		/* where the register gets saved */
     80	int when;			/* when the register gets saved */
     81};
     82
     83struct unw_reg_state {
     84	struct unw_reg_state *next;		/* next (outer) element on state stack */
     85	struct unw_reg_info reg[UNW_NUM_REGS];	/* register save locations */
     86};
     87
     88struct unw_labeled_state {
     89	struct unw_labeled_state *next;		/* next labeled state (or NULL) */
     90	unsigned long label;			/* label for this state */
     91	struct unw_reg_state saved_state;
     92};
     93
     94struct unw_state_record {
     95	unsigned int first_region : 1;	/* is this the first region? */
     96	unsigned int done : 1;		/* are we done scanning descriptors? */
     97	unsigned int any_spills : 1;	/* got any register spills? */
     98	unsigned int in_body : 1;	/* are we inside a body (as opposed to a prologue)? */
     99	unsigned long flags;		/* see UNW_FLAG_* in unwind.h */
    100
    101	u8 *imask;			/* imask of spill_mask record or NULL */
    102	unsigned long pr_val;		/* predicate values */
    103	unsigned long pr_mask;		/* predicate mask */
    104	long spill_offset;		/* psp-relative offset for spill base */
    105	int region_start;
    106	int region_len;
    107	int epilogue_start;
    108	int epilogue_count;
    109	int when_target;
    110
    111	u8 gr_save_loc;			/* next general register to use for saving a register */
    112	u8 return_link_reg;		/* branch register in which the return link is passed */
    113
    114	struct unw_labeled_state *labeled_states;	/* list of all labeled states */
    115	struct unw_reg_state curr;	/* current state */
    116};
    117
    118enum unw_nat_type {
    119	UNW_NAT_NONE,		/* NaT not represented */
    120	UNW_NAT_VAL,		/* NaT represented by NaT value (fp reg) */
    121	UNW_NAT_MEMSTK,		/* NaT value is in unat word at offset OFF  */
    122	UNW_NAT_REGSTK		/* NaT is in rnat */
    123};
    124
    125enum unw_insn_opcode {
    126	UNW_INSN_ADD,			/* s[dst] += val */
    127	UNW_INSN_ADD_PSP,		/* s[dst] = (s.psp + val) */
    128	UNW_INSN_ADD_SP,		/* s[dst] = (s.sp + val) */
    129	UNW_INSN_MOVE,			/* s[dst] = s[val] */
    130	UNW_INSN_MOVE2,			/* s[dst] = s[val]; s[dst+1] = s[val+1] */
    131	UNW_INSN_MOVE_STACKED,		/* s[dst] = ia64_rse_skip(*s.bsp, val) */
    132	UNW_INSN_SETNAT_MEMSTK,		/* s[dst+1].nat.type = MEMSTK;
    133					   s[dst+1].nat.off = *s.pri_unat - s[dst] */
    134	UNW_INSN_SETNAT_TYPE,		/* s[dst+1].nat.type = val */
    135	UNW_INSN_LOAD,			/* s[dst] = *s[val] */
    136	UNW_INSN_MOVE_SCRATCH,		/* s[dst] = scratch reg "val" */
    137	UNW_INSN_MOVE_CONST,            /* s[dst] = constant reg "val" */
    138};
    139
    140struct unw_insn {
    141	unsigned int opc	:  4;
    142	unsigned int dst	:  9;
    143	signed int val		: 19;
    144};
    145
    146/*
    147 * Preserved general static registers (r4-r7) give rise to two script
    148 * instructions; everything else yields at most one instruction; at
    149 * the end of the script, the psp gets popped, accounting for one more
    150 * instruction.
    151 */
    152#define UNW_MAX_SCRIPT_LEN	(UNW_NUM_REGS + 5)
    153
    154struct unw_script {
    155	unsigned long ip;		/* ip this script is for */
    156	unsigned long pr_mask;		/* mask of predicates script depends on */
    157	unsigned long pr_val;		/* predicate values this script is for */
    158	rwlock_t lock;
    159	unsigned int flags;		/* see UNW_FLAG_* in unwind.h */
    160	unsigned short lru_chain;	/* used for least-recently-used chain */
    161	unsigned short coll_chain;	/* used for hash collisions */
    162	unsigned short hint;		/* hint for next script to try (or -1) */
    163	unsigned short count;		/* number of instructions in script */
    164	struct unw_insn insn[UNW_MAX_SCRIPT_LEN];
    165};