/*      $NetBSD: dwarf_frame.c,v 1.5 2024/03/03 17:37:31 christos Exp $ */

/*-
* Copyright (c) 2009,2011 Kai Wang
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/

#include "_libdwarf.h"

__RCSID("$NetBSD: dwarf_frame.c,v 1.5 2024/03/03 17:37:31 christos Exp $");
ELFTC_VCSID("Id: dwarf_frame.c 3106 2014-12-19 16:00:58Z kaiwang27");

int
dwarf_get_fde_list(Dwarf_Debug dbg, Dwarf_Cie **cie_list,
   Dwarf_Signed *cie_count, Dwarf_Fde **fde_list, Dwarf_Signed *fde_count,
   Dwarf_Error *error)
{

       if (dbg == NULL || cie_list == NULL || cie_count == NULL ||
           fde_list == NULL || fde_count == NULL) {
               DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
               return (DW_DLV_ERROR);
       }

       if (dbg->dbg_internal_reg_table == NULL) {
               if (_dwarf_frame_interal_table_init(dbg, error) != DW_DLE_NONE)
                       return (DW_DLV_ERROR);
       }

       if (dbg->dbg_frame == NULL) {
               if (_dwarf_frame_section_load(dbg, error) != DW_DLE_NONE)
                       return (DW_DLV_ERROR);
               if (dbg->dbg_frame == NULL) {
                       DWARF_SET_ERROR(dbg, error, DW_DLE_NO_ENTRY);
                       return (DW_DLV_NO_ENTRY);
               }
       }

       if (dbg->dbg_frame->fs_ciearray == NULL ||
           dbg->dbg_frame->fs_fdearray == NULL) {
               DWARF_SET_ERROR(dbg, error, DW_DLE_NO_ENTRY);
               return (DW_DLV_NO_ENTRY);
       }

       *cie_list = dbg->dbg_frame->fs_ciearray;
       *cie_count = dbg->dbg_frame->fs_cielen;
       *fde_list = dbg->dbg_frame->fs_fdearray;
       *fde_count = dbg->dbg_frame->fs_fdelen;

       return (DW_DLV_OK);
}

int
dwarf_get_fde_list_eh(Dwarf_Debug dbg, Dwarf_Cie **cie_list,
   Dwarf_Signed *cie_count, Dwarf_Fde **fde_list, Dwarf_Signed *fde_count,
   Dwarf_Error *error)
{

       if (dbg == NULL || cie_list == NULL || cie_count == NULL ||
           fde_list == NULL || fde_count == NULL) {
               DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
               return (DW_DLV_ERROR);
       }

       if (dbg->dbg_internal_reg_table == NULL) {
               if (_dwarf_frame_interal_table_init(dbg, error) != DW_DLE_NONE)
                       return (DW_DLV_ERROR);
       }

       if (dbg->dbg_eh_frame == NULL) {
               if (_dwarf_frame_section_load_eh(dbg, error) != DW_DLE_NONE)
                       return (DW_DLV_ERROR);
               if (dbg->dbg_eh_frame == NULL) {
                       DWARF_SET_ERROR(dbg, error, DW_DLE_NO_ENTRY);
                       return (DW_DLV_NO_ENTRY);
               }
       }

       if (dbg->dbg_eh_frame->fs_ciearray == NULL ||
           dbg->dbg_eh_frame->fs_fdearray == NULL) {
               DWARF_SET_ERROR(dbg, error, DW_DLE_NO_ENTRY);
               return (DW_DLV_NO_ENTRY);
       }

       *cie_list = dbg->dbg_eh_frame->fs_ciearray;
       *cie_count = dbg->dbg_eh_frame->fs_cielen;
       *fde_list = dbg->dbg_eh_frame->fs_fdearray;
       *fde_count = dbg->dbg_eh_frame->fs_fdelen;

       return (DW_DLV_OK);
}

int
dwarf_get_fde_n(Dwarf_Fde *fdelist, Dwarf_Unsigned fde_index,
   Dwarf_Fde *ret_fde, Dwarf_Error *error)
{
       Dwarf_FrameSec fs;
       Dwarf_Debug dbg;

       dbg = fdelist != NULL ? (*fdelist)->fde_dbg : NULL;

       if (fdelist == NULL || ret_fde == NULL) {
               DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
               return (DW_DLV_ERROR);
       }

       fs = fdelist[0]->fde_fs;
       assert(fs != NULL);

       if (fde_index >= fs->fs_fdelen) {
               DWARF_SET_ERROR(dbg, error, DW_DLE_NO_ENTRY);
               return (DW_DLV_NO_ENTRY);
       }

       *ret_fde = fdelist[fde_index];

       return (DW_DLV_OK);
}

int
dwarf_get_fde_at_pc(Dwarf_Fde *fdelist, Dwarf_Addr pc, Dwarf_Fde *ret_fde,
   Dwarf_Addr *lopc, Dwarf_Addr *hipc, Dwarf_Error *error)
{
       Dwarf_FrameSec fs;
       Dwarf_Debug dbg;
       Dwarf_Fde fde;
       int i;

       dbg = fdelist != NULL ? (*fdelist)->fde_dbg : NULL;

       if (fdelist == NULL || ret_fde == NULL || lopc == NULL ||
           hipc == NULL) {
               DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
               return (DW_DLV_ERROR);
       }

       fs = fdelist[0]->fde_fs;
       assert(fs != NULL);

       for (i = 0; (Dwarf_Unsigned)i < fs->fs_fdelen; i++) {
               fde = fdelist[i];
               if (pc >= fde->fde_initloc && pc < fde->fde_initloc +
                   fde->fde_adrange) {
                       *ret_fde = fde;
                       *lopc = fde->fde_initloc;
                       *hipc = fde->fde_initloc + fde->fde_adrange - 1;
                       return (DW_DLV_OK);
               }
       }

       DWARF_SET_ERROR(dbg, error, DW_DLE_NO_ENTRY);
       return (DW_DLV_NO_ENTRY);
}

int
dwarf_get_cie_of_fde(Dwarf_Fde fde, Dwarf_Cie *ret_cie, Dwarf_Error *error)
{
       Dwarf_Debug dbg;

       dbg = fde != NULL ? fde->fde_dbg : NULL;

       if (fde == NULL || ret_cie == NULL) {
               DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
               return (DW_DLV_ERROR);
       }

       *ret_cie = fde->fde_cie;

       return (DW_DLV_OK);
}

int
dwarf_get_fde_range(Dwarf_Fde fde, Dwarf_Addr *low_pc, Dwarf_Unsigned *func_len,
   Dwarf_Ptr *fde_bytes, Dwarf_Unsigned *fde_byte_len, Dwarf_Off *cie_offset,
   Dwarf_Signed *cie_index, Dwarf_Off *fde_offset, Dwarf_Error *error)
{
       Dwarf_Debug dbg;

       dbg = fde != NULL ? fde->fde_dbg : NULL;

       if (fde == NULL || low_pc == NULL || func_len == NULL ||
           fde_bytes == NULL || fde_byte_len == NULL || cie_offset == NULL ||
           cie_index == NULL || fde_offset == NULL) {
               DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
               return (DW_DLV_ERROR);
       }

       *low_pc = fde->fde_initloc;
       *func_len = fde->fde_adrange;
       *fde_bytes = fde->fde_addr;
       *fde_byte_len = fde->fde_length;
       *cie_offset = fde->fde_cieoff;
       *cie_index = fde->fde_cie->cie_index;
       *fde_offset = fde->fde_offset;

       return (DW_DLV_OK);
}

int
dwarf_get_cie_info(Dwarf_Cie cie, Dwarf_Unsigned *bytes_in_cie,
   Dwarf_Small *version, char **augmenter, Dwarf_Unsigned *caf,
   Dwarf_Unsigned *daf, Dwarf_Half *ra, Dwarf_Ptr *initinst,
   Dwarf_Unsigned *inst_len, Dwarf_Error *error)
{

       if (cie == NULL || bytes_in_cie == NULL || version == NULL ||
           augmenter == NULL || caf == NULL || daf == NULL || ra == NULL ||
           initinst == NULL || inst_len == NULL) {
               DWARF_SET_ERROR(NULL, error, DW_DLE_ARGUMENT);
               return (DW_DLV_ERROR);
       }

       *bytes_in_cie = cie->cie_length;
       *version = cie->cie_version;
       *augmenter = (char *) cie->cie_augment;
       *caf = cie->cie_caf;
       *daf = cie->cie_daf;
       *ra = cie->cie_ra;
       *initinst = cie->cie_initinst;
       *inst_len = cie->cie_instlen;

       return (DW_DLV_OK);
}

int
dwarf_get_cie_index(Dwarf_Cie cie, Dwarf_Signed *cie_index, Dwarf_Error *error)
{

       if (cie == NULL || cie_index == NULL) {
               DWARF_SET_ERROR(NULL, error, DW_DLE_ARGUMENT);
               return (DW_DLV_ERROR);
       }

       *cie_index = cie->cie_index;

       return (DW_DLV_OK);
}

int
dwarf_get_fde_instr_bytes(Dwarf_Fde fde, Dwarf_Ptr *ret_inst,
   Dwarf_Unsigned *ret_len, Dwarf_Error *error)
{
       Dwarf_Debug dbg;

       dbg = fde != NULL ? fde->fde_dbg : NULL;

       if (fde == NULL || ret_inst == NULL || ret_len == NULL) {
               DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
               return (DW_DLV_ERROR);
       }

       *ret_inst = fde->fde_inst;
       *ret_len = fde->fde_instlen;

       return (DW_DLV_OK);
}

#define RL      rt->rt3_rules[table_column]
#define CFA     rt->rt3_cfa_rule

int
dwarf_get_fde_info_for_reg(Dwarf_Fde fde, Dwarf_Half table_column,
   Dwarf_Addr pc_requested, Dwarf_Signed *offset_relevant,
   Dwarf_Signed *register_num, Dwarf_Signed *offset, Dwarf_Addr *row_pc,
   Dwarf_Error *error)
{
       Dwarf_Regtable3 *rt;
       Dwarf_Debug dbg;
       Dwarf_Addr pc;
       int ret;

       dbg = fde != NULL ? fde->fde_dbg : NULL;

       if (fde == NULL || offset_relevant == NULL || register_num == NULL ||
           offset == NULL || row_pc == NULL) {
               DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
               return (DW_DLV_ERROR);
       }

       if (pc_requested < fde->fde_initloc ||
           pc_requested >= fde->fde_initloc + fde->fde_adrange) {
               DWARF_SET_ERROR(dbg, error, DW_DLE_PC_NOT_IN_FDE_RANGE);
               return (DW_DLV_ERROR);
       }

       ret = _dwarf_frame_get_internal_table(fde, pc_requested, &rt, &pc,
           error);
       if (ret != DW_DLE_NONE)
               return (DW_DLV_ERROR);

       if (table_column == dbg->dbg_frame_cfa_value) {
               /* Application ask for CFA. */
               *offset_relevant = CFA.dw_offset_relevant;
               *register_num = CFA.dw_regnum;
               *offset = CFA.dw_offset_or_block_len;
       } else {
               /* Application ask for normal registers. */
               if (table_column >= dbg->dbg_frame_rule_table_size ||
                   table_column >= DW_REG_TABLE_SIZE) {
                       DWARF_SET_ERROR(dbg, error, DW_DLE_FRAME_TABLE_COL_BAD);
                       return (DW_DLV_ERROR);
               }

               *offset_relevant = RL.dw_offset_relevant;
               *register_num = RL.dw_regnum;
               *offset = RL.dw_offset_or_block_len;
       }

       *row_pc = pc;

       return (DW_DLV_OK);
}

int
dwarf_get_fde_info_for_all_regs(Dwarf_Fde fde, Dwarf_Addr pc_requested,
   Dwarf_Regtable *reg_table, Dwarf_Addr *row_pc, Dwarf_Error *error)
{
       Dwarf_Debug dbg;
       Dwarf_Regtable3 *rt;
       Dwarf_Addr pc;
       Dwarf_Half cfa;
       int i, ret;

       dbg = fde != NULL ? fde->fde_dbg : NULL;

       if (fde == NULL || reg_table == NULL || row_pc == NULL) {
               DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
               return (DW_DLV_ERROR);
       }

       assert(dbg != NULL);

       if (pc_requested < fde->fde_initloc ||
           pc_requested >= fde->fde_initloc + fde->fde_adrange) {
               DWARF_SET_ERROR(dbg, error, DW_DLE_PC_NOT_IN_FDE_RANGE);
               return (DW_DLV_ERROR);
       }

       ret = _dwarf_frame_get_internal_table(fde, pc_requested, &rt, &pc,
           error);
       if (ret != DW_DLE_NONE)
               return (DW_DLV_ERROR);

       /*
        * Copy the CFA rule to the column intended for holding the CFA,
        * if it's within the range of regtable.
        */
       cfa = dbg->dbg_frame_cfa_value;
       if (cfa < DW_REG_TABLE_SIZE) {
               reg_table->rules[cfa].dw_offset_relevant =
                   CFA.dw_offset_relevant;
               reg_table->rules[cfa].dw_regnum = CFA.dw_regnum;
               reg_table->rules[cfa].dw_offset = CFA.dw_offset_or_block_len;
       }

       /*
        * Copy other columns.
        */
       for (i = 0; i < DW_REG_TABLE_SIZE && i < dbg->dbg_frame_rule_table_size;
            i++) {

               /* Do not overwrite CFA column */
               if (i == cfa)
                       continue;

               reg_table->rules[i].dw_offset_relevant =
                   rt->rt3_rules[i].dw_offset_relevant;
               reg_table->rules[i].dw_regnum = rt->rt3_rules[i].dw_regnum;
               reg_table->rules[i].dw_offset =
                   rt->rt3_rules[i].dw_offset_or_block_len;
       }

       *row_pc = pc;

       return (DW_DLV_OK);
}

int
dwarf_get_fde_info_for_reg3(Dwarf_Fde fde, Dwarf_Half table_column,
   Dwarf_Addr pc_requested, Dwarf_Small *value_type,
   Dwarf_Signed *offset_relevant, Dwarf_Signed *register_num,
   Dwarf_Signed *offset_or_block_len, Dwarf_Ptr *block_ptr,
   Dwarf_Addr *row_pc, Dwarf_Error *error)
{
       Dwarf_Regtable3 *rt;
       Dwarf_Debug dbg;
       Dwarf_Addr pc;
       int ret;

       dbg = fde != NULL ? fde->fde_dbg : NULL;

       if (fde == NULL || value_type == NULL || offset_relevant == NULL ||
           register_num == NULL || offset_or_block_len == NULL ||
           block_ptr == NULL || row_pc == NULL) {
               DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
               return (DW_DLV_ERROR);
       }

       if (pc_requested < fde->fde_initloc ||
           pc_requested >= fde->fde_initloc + fde->fde_adrange) {
               DWARF_SET_ERROR(dbg, error, DW_DLE_PC_NOT_IN_FDE_RANGE);
               return (DW_DLV_ERROR);
       }

       ret = _dwarf_frame_get_internal_table(fde, pc_requested, &rt, &pc,
           error);
       if (ret != DW_DLE_NONE)
               return (DW_DLV_ERROR);

       if (table_column >= dbg->dbg_frame_rule_table_size) {
               DWARF_SET_ERROR(dbg, error, DW_DLE_FRAME_TABLE_COL_BAD);
               return (DW_DLV_ERROR);
       }

       *value_type = RL.dw_value_type;
       *offset_relevant = RL.dw_offset_relevant;
       *register_num = RL.dw_regnum;
       *offset_or_block_len = RL.dw_offset_or_block_len;
       *block_ptr = RL.dw_block_ptr;
       *row_pc = pc;

       return (DW_DLV_OK);
}

int
dwarf_get_fde_info_for_cfa_reg3(Dwarf_Fde fde, Dwarf_Addr pc_requested,
   Dwarf_Small *value_type, Dwarf_Signed *offset_relevant,
   Dwarf_Signed *register_num, Dwarf_Signed *offset_or_block_len,
   Dwarf_Ptr *block_ptr, Dwarf_Addr *row_pc, Dwarf_Error *error)
{
       Dwarf_Regtable3 *rt;
       Dwarf_Debug dbg;
       Dwarf_Addr pc;
       int ret;

       dbg = fde != NULL ? fde->fde_dbg : NULL;

       if (fde == NULL || value_type == NULL || offset_relevant == NULL ||
           register_num == NULL || offset_or_block_len == NULL ||
           block_ptr == NULL || row_pc == NULL) {
               DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
               return (DW_DLV_ERROR);
       }

       if (pc_requested < fde->fde_initloc ||
           pc_requested >= fde->fde_initloc + fde->fde_adrange) {
               DWARF_SET_ERROR(dbg, error, DW_DLE_PC_NOT_IN_FDE_RANGE);
               return (DW_DLV_ERROR);
       }

       ret = _dwarf_frame_get_internal_table(fde, pc_requested, &rt, &pc,
           error);
       if (ret != DW_DLE_NONE)
               return (DW_DLV_ERROR);

       *value_type = CFA.dw_value_type;
       *offset_relevant = CFA.dw_offset_relevant;
       *register_num = CFA.dw_regnum;
       *offset_or_block_len = CFA.dw_offset_or_block_len;
       *block_ptr = CFA.dw_block_ptr;
       *row_pc = pc;

       return (DW_DLV_OK);
}

#undef  RL
#undef  CFA

int
dwarf_get_fde_info_for_all_regs3(Dwarf_Fde fde, Dwarf_Addr pc_requested,
   Dwarf_Regtable3 *reg_table, Dwarf_Addr *row_pc, Dwarf_Error *error)
{
       Dwarf_Regtable3 *rt;
       Dwarf_Debug dbg;
       Dwarf_Addr pc;
       int ret;

       dbg = fde != NULL ? fde->fde_dbg : NULL;

       if (fde == NULL || reg_table == NULL || reg_table->rt3_rules == NULL ||
           row_pc == NULL) {
               DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
               return (DW_DLV_ERROR);
       }

       assert(dbg != NULL);

       if (pc_requested < fde->fde_initloc ||
           pc_requested >= fde->fde_initloc + fde->fde_adrange) {
               DWARF_SET_ERROR(dbg, error, DW_DLE_PC_NOT_IN_FDE_RANGE);
               return (DW_DLV_ERROR);
       }

       ret = _dwarf_frame_get_internal_table(fde, pc_requested, &rt, &pc,
           error);
       if (ret != DW_DLE_NONE)
               return (DW_DLV_ERROR);

       ret = _dwarf_frame_regtable_copy(dbg, &reg_table, rt, error);
       if (ret != DW_DLE_NONE)
               return (DW_DLV_ERROR);

       *row_pc = pc;

       return (DW_DLV_OK);
}

int
dwarf_expand_frame_instructions(Dwarf_Cie cie, Dwarf_Ptr instruction,
   Dwarf_Unsigned len, Dwarf_Frame_Op **ret_oplist, Dwarf_Signed *ret_opcnt,
   Dwarf_Error *error)
{
       Dwarf_Debug dbg;
       int ret;

       dbg = cie != NULL ? cie->cie_dbg : NULL;

       if (cie == NULL || instruction == NULL || len == 0 ||
           ret_oplist == NULL || ret_opcnt == NULL) {
               DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
               return (DW_DLV_ERROR);
       }

       ret = _dwarf_frame_get_fop(dbg, cie->cie_addrsize, instruction, len,
           ret_oplist, ret_opcnt, error);
       if (ret != DW_DLE_NONE)
               return (DW_DLV_ERROR);

       return (DW_DLV_OK);
}

Dwarf_Half
dwarf_set_frame_rule_table_size(Dwarf_Debug dbg, Dwarf_Half value)
{
       Dwarf_Half old_value;

       old_value = dbg->dbg_frame_rule_table_size;
       dbg->dbg_frame_rule_table_size = value;

       return (old_value);
}

Dwarf_Half
dwarf_set_frame_rule_initial_value(Dwarf_Debug dbg, Dwarf_Half value)
{
       Dwarf_Half old_value;

       old_value = dbg->dbg_frame_rule_initial_value;
       dbg->dbg_frame_rule_initial_value = value;

       return (old_value);
}

Dwarf_Half
dwarf_set_frame_cfa_value(Dwarf_Debug dbg, Dwarf_Half value)
{
       Dwarf_Half old_value;

       old_value = dbg->dbg_frame_cfa_value;
       dbg->dbg_frame_cfa_value = value;

       return (old_value);
}

Dwarf_Half
dwarf_set_frame_same_value(Dwarf_Debug dbg, Dwarf_Half value)
{
       Dwarf_Half old_value;

       old_value = dbg->dbg_frame_same_value;
       dbg->dbg_frame_same_value = value;

       return (old_value);
}

Dwarf_Half
dwarf_set_frame_undefined_value(Dwarf_Debug dbg, Dwarf_Half value)
{
       Dwarf_Half old_value;

       old_value = dbg->dbg_frame_undefined_value;
       dbg->dbg_frame_undefined_value = value;

       return (old_value);
}

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