bfd/pef-traceback.h

   1 /* PowerPC traceback table support for BFD.
   2    Copyright (C) 1993-2024 Free Software Foundation, Inc.
   3
   4    This file is part of BFD, the Binary File Descriptor library.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  19    MA 02110-1301, USA.  */
  20
  21
  22 /* Originally written by Ira Ruben, 06/28/93.  */
  23
  24 /*  This is a compiler independent representation of the AIX Version 3 traceback table (in
  25     sys/debug.h), which occurs, usually, one per procedure (routine). The table is marked by
  26     a multiple of 4 32-bit word of zeroes in the instruction space. The traceback table is
  27     also referred to as "procedure-end table".
  28
  29     The AIX traceback table representation on which this header is based is defined as a
  30     series of bit field struct specifications. Bit fields are compiler dependent! Thus,
  31     the definitions presented here follow the original header and the existing documentation
  32     (such as it is), but define the fields as BIT MASKS and other macros. The mask names,
  33     however, where chosen as the original field names to give some compatibility with the
  34     original header and to agree with the documentation.  */
  35
  36 #ifndef __TRACEBACK__
  37 #define __TRACEBACK__
  38
  39 #define TB_C 0U                 /* C */
  40 #define TB_FORTRAN 1U           /* FORTRAN */
  41 #define TB_PASCAL 2U            /* Pascal */
  42 #define TB_ADA 3U               /* ADA */
  43 #define TB_PL1 4U               /* PL1 */
  44 #define TB_BASIC 5U             /* Basic */
  45 #define TB_LISP 6U              /* Lisp */
  46 #define TB_COBOL 7U             /* eCobol */
  47 #define TB_MODULA2 8U           /* Modula2 */
  48 #define TB_CPLUSPLUS 9U         /* C++ */
  49 #define TB_RPG 10U              /* RPG */
  50 #define TB_PL8 11U              /* PL8 */
  51 #define TB_ASM 12U              /* Asm */
  52
  53 /* Flags 1.  */
  54
  55 #define TB_GLOBALLINK 0x80U     /* Routine is Global Linkage.  */
  56 #define TB_is_eprol 0x40U       /* Out-of-line prolog or epilog routine.  */
  57 #define TB_HAS_TBOFF 0x20U      /* tb_offset set (extension field).  */
  58 #define TB_INT_PROC 0x10U       /* Internal leaf routine.  */
  59 #define TB_HAS_CTL 0x08U        /* Has controlled automatic storage.  */
  60 #define TB_TOCLESS 0X04U        /* Routine has no TOC.  */
  61 #define TB_FP_PRESENT 0x02U     /* Routine has floating point ops.  */
  62 #define TB_LOG_ABORT 0x01U      /* fp_present && log/abort compiler opt.  */
  63
  64 /* Flags 2.  */
  65
  66 #define TB_INT_HNDL 0x80U       /* Routine is an interrupt handler.  */
  67 #define TB_NAME_PRESENT 0x40U   /* Name_len/name set (extension field).  */
  68 #define TB_USES_ALLOCA 0x20U    /* Uses alloca() to allocate storage.  */
  69 #define TB_CL_DIS_inv 0x1CU     /* On-condition directives (see below).  */
  70 #define TB_SAVES_CR 0x02U       /* Routine saves the CR.  */
  71 #define TB_SAVES_LR 0x01U       /* Routine saves the LR.  */
  72
  73 /* cl_dis_inv "on condition" settings:  */
  74
  75 #define TB_CL_DIS_INV(x) (((x) & cl_dis_inv) >> 2U)
  76
  77 #define TB_WALK_ONCOND 0U       /* Walk stack without restoring state.  */
  78 #define TB_DISCARD_ONCOND 1U    /* Walk stack and discard.  */
  79 #define TB_INVOKE_ONCOND 2U     /* Invoke a specific system routine.  */
  80
  81 /* Flags 3.  */
  82
  83 #define TB_STORES_BC 0x80U      /* Routine saves frame ptr of caller.  */
  84 #define TB_SPARE2 0X40U         /* Spare bit.  */
  85 #define TB_FPR_SAVED 0x3fU      /* Number of FPRs saved (max of 32).  */
  86                                 /* (Last reg saved is ALWAYS fpr31).  */
  87
  88 #define TB_NUM_FPR_SAVED(x) ((x) & fpr_saved)
  89
  90 /* Flags 4.  */
  91
  92 #define TB_HAS_VEC_INFO 0x80U   /* Routine uses vectors.  */
  93 #define TB_SPARE3 0X40U         /* Spare bit.  */
  94 #define TB_GPR_SAVED 0x3fU      /* Number of GPRs saved (max of 32).  */
  95                                 /* (Last reg saved is ALWAYS gpr31).  */
  96
  97 #define TB_NUM_GPR_SAVED(x) ((x) & gpr_saved)
  98
  99 /* Flags 5.  */
 100
 101 #define TB_FLOATPARAMS 0xfeU    /* Number of floating point parameters.  */
 102 #define TB_PARAMSONSTK 0X01U    /* All parameters are on the stack.  */
 103
 104 #define TB_NUM_FLOATPARAMS(X) (((x) & floatparams) >> 1U)
 105
 106 /* Traceback_table (fixed portion).  */
 107
 108 struct traceback_table
 109 {
 110   /* Traceback table layout (fixed portion):  */
 111
 112   unsigned char version;        /* Traceback format version.  */
 113   unsigned char lang;           /* Language indicators:  */
 114   unsigned char flags1;         /* Flag bits #1:  */
 115   unsigned char flags2;         /* Flag bits #2:  */
 116   unsigned char flags3;         /* Flag bits #3:  */
 117   unsigned char flags4;         /* Flag bits #4:  */
 118   unsigned char fixedparams;    /* Number of fixed point parameters.  */
 119   unsigned char flags5;         /* Flag bits #5:  */
 120 };
 121
 122 /* traceback_table (optional) extensions.  */
 123
 124 /* Optional portions exist independently in the order presented below,
 125    not as a structure or a union. Whether or not portions exist is
 126    determinable from bit-fields within the fixed portion above.  */
 127
 128 /* The following is present only if fixedparams or floatparams are non
 129    zero and it immediately follows the fixed portion of the traceback
 130    table...  */
 131
 132 /* Order and type encoding of parameters:  */
 133 struct traceback_table_fixedparams
 134 {
 135   unsigned long paraminfo;
 136 };
 137
 138 /* Left-justified bit-encoding as follows:  */
 139 #define FIXED_PARAM 0           /* '0'  ==> fixed param (1 gpr or word).  */
 140 #define SPFP_PARAM 2            /* '10' ==> single-precision float param.  */
 141 #define DPFP_PARAM 3            /* '11' ==> double-precision float param.  */
 142
 143 #define PARAM_ENCODING(x, bit) /* Yields xxx_PARAM as a function of "bit".  */          \
 144  ((((x)&(1UL<<(31UL-(bit++))))==0UL) /* Values 0:31 (left-to-right). "bit" is */        \
 145  ? FIXED_PARAM /* an L-value that's left incremented to */                              \
 146  : ((((x)&(1UL<<(31UL-(bit++))))==0)/* the next bit position for the next */            \
 147  ? SPFP_PARAM /* parameter.  This will be 1 or 2 bit */                                 \
 148  : DPFP_PARAM)) /* positions later.  */
 149
 150 /* The following is present only if has_tboff (in flags1) in fixed part is present...  */
 151
 152 /* Offset from start of code to TracebackTbl.  */
 153 struct traceback_table_tboff
 154 {
 155   unsigned long tb_offset;
 156 };
 157
 158 /* The following is present only if int_hndl (in flags2) in fixed part is present ...  */
 159
 160 /* What interrupts are handled by the routine.  */
 161 struct traceback_table_interrupts
 162 {
 163   long hand_mask;
 164 };
 165
 166 /* The following are present only if has_ctl (in flags1) in fixed part is present...  */
 167
 168 /* Controlled automatic storage info:  */
 169 struct traceback_table_anchors
 170 {
 171   unsigned long ctl_info;       /* Number of controlled automatic anchors.  */
 172   long ctl_info_disp[1];        /* Array of stack displacements where each.  */
 173 };                              /* Anchor is located (array STARTS here).  */
 174
 175 /* The following are present only if name_present (in flags2) in fixed
 176    part is present...  */
 177
 178 /* Routine name:  */
 179 struct traceback_table_routine
 180 {
 181   unsigned short name_len;      /* Length of name that follows.  */
 182   char name[1];                 /* Name starts here (NOT null terminated).  */
 183 };
 184
 185 /* The following are present only if uses_alloca (in flags2) in fixed
 186    part is present...  */
 187
 188 /* Register auto storage when alloca() is used.  */
 189 struct traceback_table_alloca
 190 {
 191   char alloca_reg;
 192 };
 193
 194 /* The following are present only if has_vec_info (in flags4) in fixed
 195    part is present...  */
 196
 197 /* Vector info:  */
 198 struct traceback_table_vector
 199 {
 200   unsigned char vec_flags1;     /* Vec info bits #1:  */
 201
 202 #define TB_VR_SAVED 0xFCU       /* Number of saved vector registers.  */
 203 #define TB_SAVES_VRSAVE 0x02U   /* Saves VRsave.  */
 204 #define TB_HAS_VARARGS 0x01U    /* Routine has a variable argument list.  */
 205
 206 #define TB_NUM_VR_SAVED(x) (((x) & TB_VR_SAVED) >> 2U)
 207
 208   unsigned char vec_flags2;     /* Vec info bits #2:  */
 209
 210 #define TB_VECTORPARAMS 0xfeU   /* Number of vector parameters.  */
 211 #define TB_VEC_PRESENT 0x01U    /* Routine uses at least one vec instr.  */
 212
 213 #define VECPARAMS(x) (((x) & TB_VECTORPARAMS) >> 1U)
 214 };
 215
 216 #endif