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