diff options
Diffstat (limited to 'rtemstoolkit/elftoolchain/libdwarf/dwarf_loclist.c')
| -rw-r--r-- | rtemstoolkit/elftoolchain/libdwarf/dwarf_loclist.c | 302 |
1 files changed, 302 insertions, 0 deletions
diff --git a/rtemstoolkit/elftoolchain/libdwarf/dwarf_loclist.c b/rtemstoolkit/elftoolchain/libdwarf/dwarf_loclist.c new file mode 100644 index 0000000..e780a87 --- /dev/null +++ b/rtemstoolkit/elftoolchain/libdwarf/dwarf_loclist.c @@ -0,0 +1,302 @@ +/*- + * Copyright (c) 2009,2014 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 3066 2014-06-06 19:36:06Z kaiwang27 $"); + +static int +copy_locdesc(Dwarf_Debug dbg, Dwarf_Locdesc *dst, Dwarf_Locdesc *src, + Dwarf_Error *error) +{ + + assert(src != NULL && dst != NULL); + + dst->ld_lopc = src->ld_lopc; + dst->ld_hipc = src->ld_hipc; + dst->ld_cents = src->ld_cents; + + if (dst->ld_cents > 0) { + dst->ld_s = calloc(dst->ld_cents, sizeof(Dwarf_Loc)); + if (dst->ld_s == NULL) { + DWARF_SET_ERROR(dbg, error, DW_DLE_MEMORY); + return (DW_DLE_MEMORY); + } + memcpy(dst->ld_s, src->ld_s, src->ld_cents * + sizeof(Dwarf_Loc)); + } else + dst->ld_s = NULL; + + return (DW_DLE_NONE); +} + +int +dwarf_loclist_n(Dwarf_Attribute at, Dwarf_Locdesc ***llbuf, + Dwarf_Signed *listlen, Dwarf_Error *error) +{ + 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: + /* + * DW_FORM_data[48] can not be used as section offset + * since DWARF4. For DWARF[23], the application needs + * to determine if DW_FORM_data[48] is representing + * a constant or a section offset. + */ + if (at->at_die->die_cu->cu_version >= 4) { + DWARF_SET_ERROR(dbg, error, DW_DLE_NO_ENTRY); + return (DW_DLV_NO_ENTRY); + } + /* FALLTHROUGH */ + case DW_FORM_sec_offset: + ret = _dwarf_loclist_find(dbg, at->at_die->die_cu, + at->u[0].u64, llbuf, listlen, NULL, 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); + return (DW_DLV_OK); + case DW_FORM_block: + case DW_FORM_block1: + case DW_FORM_block2: + case DW_FORM_block4: + case DW_FORM_exprloc: + if (at->at_ld == NULL) { + ret = _dwarf_loc_add(at->at_die, at, error); + if (ret != DW_DLE_NONE) + return (DW_DLV_ERROR); + } + *llbuf = calloc(1, sizeof(Dwarf_Locdesc *)); + if (*llbuf == NULL) { + DWARF_SET_ERROR(dbg, error, DW_DLE_MEMORY); + return (DW_DLV_ERROR); + } + (*llbuf)[0] = calloc(1, sizeof(Dwarf_Locdesc)); + if ((*llbuf)[0] == NULL) { + free(*llbuf); + DWARF_SET_ERROR(dbg, error, DW_DLE_MEMORY); + return (DW_DLV_ERROR); + } + if (copy_locdesc(dbg, (*llbuf)[0], at->at_ld, error) != + DW_DLE_NONE) { + free((*llbuf)[0]); + free(*llbuf); + return (DW_DLV_ERROR); + } + *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_Locdesc **_llbuf; + int i, ret; + + ret = dwarf_loclist_n(at, &_llbuf, listlen, error); + if (ret != DW_DLV_OK) + return (ret); + + /* Only return the first location description of the list. */ + *llbuf = _llbuf[0]; + + /* Free the rest of the list. */ + for (i = 1; i < *listlen; i++) { + if (_llbuf[i]->ld_s) + free(_llbuf[i]->ld_s); + free(_llbuf[i]); + } + free(_llbuf); + + *listlen = 1; + + return (DW_DLV_OK); +} + +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_Locdesc *ld, **llbuf; + Dwarf_Section *ds; + Dwarf_Signed listlen; + int i, ret; + + /* + * Note that this API sometimes will not work correctly because + * it assumes that all units have the same pointer size and offset + * size. + */ + + 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, + &llbuf, &listlen, entry_len, 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 < listlen; i++) { + ld = llbuf[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 + offset; + *next_entry = offset + *entry_len; + + 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) +{ + + return (dwarf_loclist_from_expr_a(dbg, bytes_in, bytes_len, + dbg->dbg_pointer_size, llbuf, listlen, error)); +} + +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_Half offset_size; + Dwarf_Small version; + + /* + * Obtain offset size and DWARF version from the current + * Compilation Unit or Type Unit. These values are needed + * for correctly parsing DW_OP_GNU_implicit_pointer operator. + * + * Note that dwarf_loclist_from_expr_b() should be used instead + * if the application knows correct values for offset size + * and DWARF version. + */ + if (dbg->dbg_cu_current) { + offset_size = dbg->dbg_cu_current->cu_length_size == 4 ? 4 : 8; + version = dbg->dbg_cu_current->cu_version; + } else if (dbg->dbg_tu_current) { + offset_size = dbg->dbg_tu_current->cu_length_size == 4 ? 4 : 8; + version = dbg->dbg_tu_current->cu_version; + } else { + /* Default values if no CU/TU context. */ + offset_size = 4; + version = 2; /* DWARF2 */ + } + + return (dwarf_loclist_from_expr_b(dbg, bytes_in, bytes_len, addr_size, + offset_size, version, llbuf, listlen, error)); +} + +int +dwarf_loclist_from_expr_b(Dwarf_Debug dbg, Dwarf_Ptr bytes_in, + Dwarf_Unsigned bytes_len, Dwarf_Half addr_size, Dwarf_Half offset_size, + Dwarf_Small version, 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); + } + + if (offset_size != 4 && offset_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, + offset_size, version, error); + if (ret != DW_DLE_NONE) + return (DW_DLV_ERROR); + + *llbuf = ld; + *listlen = 1; + + return (DW_DLV_OK); +} |