diff options
Diffstat (limited to 'libdwarf/dwarf_loclist.c')
| -rw-r--r-- | libdwarf/dwarf_loclist.c | 262 |
1 files changed, 262 insertions, 0 deletions
diff --git a/libdwarf/dwarf_loclist.c b/libdwarf/dwarf_loclist.c new file mode 100644 index 000000000000..cf6fa9dc9f8e --- /dev/null +++ b/libdwarf/dwarf_loclist.c @@ -0,0 +1,262 @@ +/*- + * Copyright (c) 2009 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" + +ELFTC_VCSID("$Id: dwarf_loclist.c 2074 2011-10-27 03:34:33Z jkoshy $"); + +int +dwarf_loclist_n(Dwarf_Attribute at, Dwarf_Locdesc ***llbuf, + Dwarf_Signed *listlen, Dwarf_Error *error) +{ + Dwarf_Loclist ll; + Dwarf_Debug dbg; + int ret; + + dbg = at != NULL ? at->at_die->die_dbg : NULL; + + if (at == NULL || llbuf == NULL || listlen == NULL) { + DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT); + return (DW_DLV_ERROR); + } + + switch (at->at_attrib) { + case DW_AT_location: + case DW_AT_string_length: + case DW_AT_return_addr: + case DW_AT_data_member_location: + case DW_AT_frame_base: + case DW_AT_segment: + case DW_AT_static_link: + case DW_AT_use_location: + case DW_AT_vtable_elem_location: + switch (at->at_form) { + case DW_FORM_data4: + case DW_FORM_data8: + ret = _dwarf_loclist_find(at->at_die->die_dbg, + at->at_die->die_cu, at->u[0].u64, &ll, error); + if (ret == DW_DLE_NO_ENTRY) { + DWARF_SET_ERROR(dbg, error, ret); + return (DW_DLV_NO_ENTRY); + } + if (ret != DW_DLE_NONE) + return (DW_DLV_ERROR); + *llbuf = ll->ll_ldlist; + *listlen = ll->ll_ldlen; + return (DW_DLV_OK); + case DW_FORM_block: + case DW_FORM_block1: + case DW_FORM_block2: + case DW_FORM_block4: + if (at->at_ld == NULL) { + ret = _dwarf_loc_add(at->at_die, at, error); + if (ret != DW_DLE_NONE) + return (DW_DLV_ERROR); + } + *llbuf = &at->at_ld; + *listlen = 1; + return (DW_DLV_OK); + default: + /* Malformed Attr? */ + DWARF_SET_ERROR(dbg, error, DW_DLE_ATTR_FORM_BAD); + return (DW_DLV_NO_ENTRY); + } + default: + /* Wrong attr supplied. */ + DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT); + return (DW_DLV_ERROR); + } +} + +int +dwarf_loclist(Dwarf_Attribute at, Dwarf_Locdesc **llbuf, + Dwarf_Signed *listlen, Dwarf_Error *error) +{ + Dwarf_Loclist ll; + Dwarf_Debug dbg; + int ret; + + dbg = at != NULL ? at->at_die->die_dbg : NULL; + + if (at == NULL || llbuf == NULL || listlen == NULL) { + DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT); + return (DW_DLV_ERROR); + } + + switch (at->at_attrib) { + case DW_AT_location: + case DW_AT_string_length: + case DW_AT_return_addr: + case DW_AT_data_member_location: + case DW_AT_frame_base: + case DW_AT_segment: + case DW_AT_static_link: + case DW_AT_use_location: + case DW_AT_vtable_elem_location: + switch (at->at_form) { + case DW_FORM_data4: + case DW_FORM_data8: + ret = _dwarf_loclist_find(at->at_die->die_dbg, + at->at_die->die_cu, at->u[0].u64, &ll, error); + if (ret == DW_DLE_NO_ENTRY) { + DWARF_SET_ERROR(dbg, error, DW_DLV_NO_ENTRY); + return (DW_DLV_NO_ENTRY); + } + if (ret != DW_DLE_NONE) + return (DW_DLV_ERROR); + *llbuf = ll->ll_ldlist[0]; + *listlen = 1; + return (DW_DLV_OK); + case DW_FORM_block: + case DW_FORM_block1: + case DW_FORM_block2: + case DW_FORM_block4: + if (at->at_ld == NULL) { + ret = _dwarf_loc_add(at->at_die, at, error); + if (ret != DW_DLE_NONE) + return (DW_DLV_ERROR); + } + *llbuf = at->at_ld; + *listlen = 1; + return (DW_DLV_OK); + default: + DWARF_SET_ERROR(dbg, error, DW_DLE_ATTR_FORM_BAD); + return (DW_DLV_ERROR); + } + default: + /* Wrong attr supplied. */ + DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT); + return (DW_DLV_ERROR); + } +} + +int +dwarf_get_loclist_entry(Dwarf_Debug dbg, Dwarf_Unsigned offset, + Dwarf_Addr *hipc, Dwarf_Addr *lopc, Dwarf_Ptr *data, + Dwarf_Unsigned *entry_len, Dwarf_Unsigned *next_entry, + Dwarf_Error *error) +{ + Dwarf_Loclist ll, next_ll; + Dwarf_Locdesc *ld; + Dwarf_Section *ds; + int i, ret; + + if (dbg == NULL || hipc == NULL || lopc == NULL || data == NULL || + entry_len == NULL || next_entry == NULL) { + DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT); + return (DW_DLV_ERROR); + } + + ret = _dwarf_loclist_find(dbg, STAILQ_FIRST(&dbg->dbg_cu), offset, &ll, + error); + if (ret == DW_DLE_NO_ENTRY) { + DWARF_SET_ERROR(dbg, error, DW_DLV_NO_ENTRY); + return (DW_DLV_NO_ENTRY); + } else if (ret != DW_DLE_NONE) + return (DW_DLV_ERROR); + + *hipc = *lopc = 0; + for (i = 0; i < ll->ll_ldlen; i++) { + ld = ll->ll_ldlist[i]; + if (i == 0) { + *hipc = ld->ld_hipc; + *lopc = ld->ld_lopc; + } else { + if (ld->ld_lopc < *lopc) + *lopc = ld->ld_lopc; + if (ld->ld_hipc > *hipc) + *hipc = ld->ld_hipc; + } + } + + ds = _dwarf_find_section(dbg, ".debug_loc"); + assert(ds != NULL); + *data = (uint8_t *) ds->ds_data + ll->ll_offset; + *entry_len = ll->ll_length; + + next_ll = TAILQ_NEXT(ll, ll_next); + if (next_ll != NULL) + *next_entry = next_ll->ll_offset; + else + *next_entry = ds->ds_size; + + return (DW_DLV_OK); +} + +int +dwarf_loclist_from_expr(Dwarf_Debug dbg, Dwarf_Ptr bytes_in, + Dwarf_Unsigned bytes_len, Dwarf_Locdesc **llbuf, Dwarf_Signed *listlen, + Dwarf_Error *error) +{ + Dwarf_Locdesc *ld; + int ret; + + if (dbg == NULL || bytes_in == NULL || bytes_len == 0 || + llbuf == NULL || listlen == NULL) { + DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT); + return (DW_DLV_ERROR); + } + + ret = _dwarf_loc_fill_locexpr(dbg, &ld, bytes_in, bytes_len, + dbg->dbg_pointer_size, error); + if (ret != DW_DLE_NONE) + return (DW_DLV_ERROR); + + *llbuf = ld; + *listlen = 1; + + return (DW_DLV_OK); +} + +int +dwarf_loclist_from_expr_a(Dwarf_Debug dbg, Dwarf_Ptr bytes_in, + Dwarf_Unsigned bytes_len, Dwarf_Half addr_size, Dwarf_Locdesc **llbuf, + Dwarf_Signed *listlen, Dwarf_Error *error) +{ + Dwarf_Locdesc *ld; + int ret; + + if (dbg == NULL || bytes_in == NULL || bytes_len == 0 || + llbuf == NULL || listlen == NULL) { + DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT); + return (DW_DLV_ERROR); + } + + if (addr_size != 4 && addr_size != 8) { + DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT); + return (DW_DLV_ERROR); + } + + ret = _dwarf_loc_fill_locexpr(dbg, &ld, bytes_in, bytes_len, addr_size, + error); + if (ret != DW_DLE_NONE) + return (DW_DLV_ERROR); + + *llbuf = ld; + *listlen = 1; + + return (DW_DLV_OK); +} |