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/* Header file for unwinding stack frames for exception handling. */
/* Compile this one with gcc. */
/* Copyright (C) 1997, 1998, 1999 Free Software Foundation, Inc.
Contributed by Jason Merrill <jason@cygnus.com>.
This file is part of GNU CC.
GNU CC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
GNU CC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU CC; see the file COPYING. If not, write to
the Free Software Foundation, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
/* Number of hardware registers known to the compiler.
We have 128 general registers, 128 floating point registers, 64 predicate
registers, 8 branch registers, and one frame pointer register. */
/* ??? Should add ar.lc, ar.ec and probably also ar.pfs. */
#define FIRST_PSEUDO_REGISTER 330
#ifndef DWARF_FRAME_REGISTERS
#define DWARF_FRAME_REGISTERS FIRST_PSEUDO_REGISTER
#endif
typedef struct frame_state
{
void *cfa;
void *eh_ptr;
long cfa_offset;
long args_size;
long reg_or_offset[DWARF_FRAME_REGISTERS+1];
unsigned short cfa_reg;
unsigned short retaddr_column;
char saved[DWARF_FRAME_REGISTERS+1];
} frame_state;
/* Values for 'saved' above. */
#define REG_UNSAVED 0
#define REG_SAVED_OFFSET 1
#define REG_SAVED_REG 2
/* The representation for an "object" to be searched for frame unwind info.
For targets with named sections, one object is an executable or shared
library; for other targets, one object is one translation unit.
A copy of this structure declaration is printed by collect2.c;
keep the copies synchronized! */
struct object {
#ifdef IA64_UNWIND_INFO
void *pc_base; /* This field will be set by __do_frame_setup. */
#endif
void *pc_begin;
void *pc_end;
struct dwarf_fde *fde_begin;
struct dwarf_fde **fde_array;
size_t count;
struct object *next;
};
/* Called from __throw to find the registers to restore for a given
PC_TARGET. The caller should allocate a local variable of `struct
frame_state' (declared in frame.h) and pass its address to STATE_IN.
Returns NULL on failure, otherwise returns STATE_IN. */
extern struct frame_state *__frame_state_for (void *, struct frame_state *);
#ifdef IA64_UNWIND_INFO
/* This is the information required for unwind records in an ia64
object file. This is required by GAS and the compiler runtime. */
/* These are the starting point masks for the various types of
unwind records. To create a record of type R3 for instance, one
starts by using the value UNW_R3 and or-ing in any other required values.
These values are also unique (in context), so they can be used to identify
the various record types as well. UNW_Bx and some UNW_Px do have the
same value, but Px can only occur in a prologue context, and Bx in
a body context. */
#define UNW_R1 0x00
#define UNW_R2 0x40
#define UNW_R3 0x60
#define UNW_P1 0x80
#define UNW_P2 0xA0
#define UNW_P3 0xB0
#define UNW_P4 0xB8
#define UNW_P5 0xB9
#define UNW_P6 0xC0
#define UNW_P7 0xE0
#define UNW_P8 0xF0
#define UNW_P9 0xF1
#define UNW_P10 0xFF
#define UNW_X1 0xF9
#define UNW_X2 0xFA
#define UNW_X3 0xFB
#define UNW_X4 0xFC
#define UNW_B1 0x80
#define UNW_B2 0xC0
#define UNW_B3 0xE0
#define UNW_B4 0xF0
/* These are all the various types of unwind records. */
typedef enum
{
prologue, prologue_gr, body, mem_stack_f, mem_stack_v, psp_gr, psp_sprel,
rp_when, rp_gr, rp_br, rp_psprel, rp_sprel, pfs_when, pfs_gr, pfs_psprel,
pfs_sprel, preds_when, preds_gr, preds_psprel, preds_sprel,
fr_mem, frgr_mem, gr_gr, gr_mem, br_mem, br_gr, spill_base, spill_mask,
unat_when, unat_gr, unat_psprel, unat_sprel, lc_when, lc_gr, lc_psprel,
lc_sprel, fpsr_when, fpsr_gr, fpsr_psprel, fpsr_sprel,
priunat_when_gr, priunat_when_mem, priunat_gr, priunat_psprel,
priunat_sprel, bsp_when, bsp_gr, bsp_psprel, bsp_sprel, bspstore_when,
bspstore_gr, bspstore_psprel, bspstore_sprel, rnat_when, rnat_gr,
rnat_psprel, rnat_sprel, epilogue, label_state, copy_state,
spill_psprel, spill_sprel, spill_reg, spill_psprel_p, spill_sprel_p,
spill_reg_p
} unw_record_type;
/* These structures declare the fields that can be used in each of the
4 record formats, R, P, B and X. */
typedef struct unw_r_record
{
unsigned long rlen;
unsigned short mask;
unsigned short grsave;
} unw_r_record;
typedef struct unw_p_record
{
void *imask;
unsigned long t;
unsigned long size;
unsigned long spoff;
unsigned long br;
unsigned long pspoff;
unsigned short gr;
unsigned short rmask;
unsigned short grmask;
unsigned long frmask;
unsigned short brmask;
} unw_p_record;
typedef struct unw_b_record
{
unsigned long t;
unsigned long label;
unsigned short ecount;
} unw_b_record;
typedef struct unw_x_record
{
unsigned long t;
unsigned long spoff;
unsigned long pspoff;
unsigned short reg;
unsigned short treg;
unsigned short qp;
unsigned short xy; /* Value of the XY field.. */
} unw_x_record;
/* This structure is used to determine the specific record type and
its fields. */
typedef struct unwind_record
{
unw_record_type type;
union {
unw_r_record r;
unw_p_record p;
unw_b_record b;
unw_x_record x;
} record;
} unwind_record;
/* This structure represents the start of an unwind information pointer.
'unwind_descriptors' is the beginninng of the unwind descriptors, which
use up 'length' bytes of storage. */
typedef struct unwind_info_ptr
{
unsigned short version;
unsigned short flags;
unsigned int length;
unsigned char unwind_descriptors[1];
} unwind_info_ptr;
#define IA64_UNW_LOC_TYPE_NONE 0
#define IA64_UNW_LOC_TYPE_MEM 1
#define IA64_UNW_LOC_TYPE_GR 2
#define IA64_UNW_LOC_TYPE_FR 3
#define IA64_UNW_LOC_TYPE_BR 4
#define IA64_UNW_LOC_TYPE_SPOFF 5
#define IA64_UNW_LOC_TYPE_PSPOFF 6
#define IA64_UNW_LOC_TYPE_OFFSET 7
#define IA64_UNW_LOC_TYPE_SPILLBASE 8
typedef struct ia64_reg_loc
{
long when; /* PC relative offset from start of function. */
union { /* In memory or another register? */
void *mem;
int regno;
int offset;
} l;
short loc_type; /* Where to find value. */
short reg_size;
} ia64_reg_loc;
/* Frame information record. */
typedef struct ia64_frame_state
{
ia64_reg_loc gr[4]; /* gr4 to gr7. */
ia64_reg_loc fr[20]; /* fr2 to fr5, fr16 to fr31. */
ia64_reg_loc br[5]; /* br1 to br5. */
ia64_reg_loc rp;
ia64_reg_loc fpsr;
ia64_reg_loc bsp;
ia64_reg_loc bspstore;
ia64_reg_loc rnat;
ia64_reg_loc pfs;
ia64_reg_loc unat;
ia64_reg_loc lc;
ia64_reg_loc pr;
ia64_reg_loc priunat;
ia64_reg_loc sp;
ia64_reg_loc psp;
ia64_reg_loc spill_base;
void *my_sp;
void *my_bsp;
} ia64_frame_state;
extern unwind_info_ptr *build_ia64_frame_state (unsigned char *, ia64_frame_state *,
void *, void *);
extern void *get_real_reg_value (ia64_reg_loc *);
extern void *get_personality (unwind_info_ptr *);
extern void *get_except_table (unwind_info_ptr *);
extern void set_real_reg_value (ia64_reg_loc *, void *);
void *calc_caller_bsp (long, unsigned char *);
#endif /* IA64_UNWIND_INFO */
/* Note the following routines are exported interfaces from libgcc; do not
change these interfaces. Instead create new interfaces. Also note
references to these functions may be made weak in files where they
are referenced. */
extern void __register_frame (void * );
extern void __register_frame_table (void *);
extern void __deregister_frame (void *);
/* Called either from crtbegin.o or a static constructor to register the
unwind info for an object or translation unit, respectively. */
extern void __register_frame_info (void *, struct object *);
/* Similar, but BEGIN is actually a pointer to a table of unwind entries
for different translation units. Called from the file generated by
collect2. */
extern void __register_frame_info_table (void *, struct object *);
/* Called from crtend.o to deregister the unwind info for an object. */
extern void *__deregister_frame_info (void *);
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