/* * File dwarf.c - read dwarf2 information from the ELF modules * * Copyright (C) 2005, Raphael Junqueira * Copyright (C) 2006-2010, Eric Pouech * Copyright (C) 2010, Alexandre Julliard * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA */ #define NONAMELESSUNION #include "config.h" #include #include #ifdef HAVE_SYS_STAT_H # include #endif #ifdef HAVE_SYS_MMAN_H #include #endif #include #include #include #ifdef HAVE_UNISTD_H # include #endif #include #ifndef PATH_MAX #define PATH_MAX MAX_PATH #endif #include #include #include "windef.h" #include "winbase.h" #include "winuser.h" #include "ole2.h" #include "oleauto.h" #include "dbghelp_private.h" #include "image_private.h" #include "wine/debug.h" WINE_DEFAULT_DEBUG_CHANNEL(dbghelp_dwarf); /* FIXME: * - Functions: * o unspecified parameters * o inlined functions * o Debug{Start|End}Point * o CFA * - Udt * o proper types loading (nesting) */ #if 0 static void dump(const void* ptr, unsigned len) { int i, j; BYTE msg[128]; static const char hexof[] = "0123456789abcdef"; const BYTE* x = ptr; for (i = 0; i < len; i += 16) { sprintf(msg, "%08x: ", i); memset(msg + 10, ' ', 3 * 16 + 1 + 16); for (j = 0; j < min(16, len - i); j++) { msg[10 + 3 * j + 0] = hexof[x[i + j] >> 4]; msg[10 + 3 * j + 1] = hexof[x[i + j] & 15]; msg[10 + 3 * j + 2] = ' '; msg[10 + 3 * 16 + 1 + j] = (x[i + j] >= 0x20 && x[i + j] < 0x7f) ? x[i + j] : '.'; } msg[10 + 3 * 16] = ' '; msg[10 + 3 * 16 + 1 + 16] = '\0'; TRACE("%s\n", msg); } } #endif /** * * Main Specs: * http://www.eagercon.com/dwarf/dwarf3std.htm * http://www.eagercon.com/dwarf/dwarf-2.0.0.pdf * * dwarf2.h: http://www.hakpetzna.com/b/binutils/dwarf2_8h-source.html * * example of projects who do dwarf2 parsing: * http://www.x86-64.org/cgi-bin/cvsweb.cgi/binutils.dead/binutils/readelf.c?rev=1.1.1.2 * http://elis.ugent.be/diota/log/ltrace_elf.c */ #include "dwarf.h" /** * Parsers */ typedef struct dwarf2_abbrev_entry_attr_s { unsigned long attribute; unsigned long form; struct dwarf2_abbrev_entry_attr_s* next; } dwarf2_abbrev_entry_attr_t; typedef struct dwarf2_abbrev_entry_s { unsigned long entry_code; unsigned long tag; unsigned char have_child; unsigned num_attr; dwarf2_abbrev_entry_attr_t* attrs; } dwarf2_abbrev_entry_t; struct dwarf2_block { unsigned size; const unsigned char* ptr; }; struct attribute { unsigned long form; union { unsigned long uvalue; ULONGLONG lluvalue; long svalue; const char* string; struct dwarf2_block block; } u; }; typedef struct dwarf2_debug_info_s { const dwarf2_abbrev_entry_t*abbrev; struct symt* symt; const unsigned char** data; struct vector children; } dwarf2_debug_info_t; typedef struct dwarf2_section_s { const unsigned char* address; unsigned size; DWORD_PTR rva; } dwarf2_section_t; enum dwarf2_sections {section_debug, section_string, section_abbrev, section_line, section_max}; typedef struct dwarf2_traverse_context_s { const unsigned char* data; const unsigned char* end_data; unsigned char word_size; } dwarf2_traverse_context_t; /* symt_cache indexes */ #define sc_void 0 #define sc_int1 1 #define sc_int2 2 #define sc_int4 3 #define sc_num 4 typedef struct dwarf2_parse_context_s { const dwarf2_section_t* sections; unsigned section; struct pool pool; struct module* module; const struct elf_thunk_area*thunks; struct sparse_array abbrev_table; struct sparse_array debug_info_table; unsigned long load_offset; unsigned long ref_offset; struct symt* symt_cache[sc_num]; /* void, int1, int2, int4 */ } dwarf2_parse_context_t; /* stored in the dbghelp's module internal structure for later reuse */ struct dwarf2_module_info_s { dwarf2_section_t debug_loc; dwarf2_section_t debug_frame; dwarf2_section_t eh_frame; unsigned char word_size; }; #define loc_dwarf2_location_list (loc_user + 0) #define loc_dwarf2_block (loc_user + 1) /* forward declarations */ static struct symt* dwarf2_parse_enumeration_type(dwarf2_parse_context_t* ctx, dwarf2_debug_info_t* entry); static unsigned char dwarf2_get_byte(const unsigned char* ptr) { return *ptr; } static unsigned char dwarf2_parse_byte(dwarf2_traverse_context_t* ctx) { unsigned char uvalue = dwarf2_get_byte(ctx->data); ctx->data += 1; return uvalue; } static unsigned short dwarf2_get_u2(const unsigned char* ptr) { return *(const UINT16*)ptr; } static unsigned short dwarf2_parse_u2(dwarf2_traverse_context_t* ctx) { unsigned short uvalue = dwarf2_get_u2(ctx->data); ctx->data += 2; return uvalue; } static unsigned long dwarf2_get_u4(const unsigned char* ptr) { return *(const UINT32*)ptr; } static unsigned long dwarf2_parse_u4(dwarf2_traverse_context_t* ctx) { unsigned long uvalue = dwarf2_get_u4(ctx->data); ctx->data += 4; return uvalue; } static DWORD64 dwarf2_get_u8(const unsigned char* ptr) { return *(const UINT64*)ptr; } static DWORD64 dwarf2_parse_u8(dwarf2_traverse_context_t* ctx) { DWORD64 uvalue = dwarf2_get_u8(ctx->data); ctx->data += 8; return uvalue; } static unsigned long dwarf2_get_leb128_as_unsigned(const unsigned char* ptr, const unsigned char** end) { unsigned long ret = 0; unsigned char byte; unsigned shift = 0; do { byte = dwarf2_get_byte(ptr++); ret |= (byte & 0x7f) << shift; shift += 7; } while (byte & 0x80); if (end) *end = ptr; return ret; } static unsigned long dwarf2_leb128_as_unsigned(dwarf2_traverse_context_t* ctx) { unsigned long ret; assert(ctx); ret = dwarf2_get_leb128_as_unsigned(ctx->data, &ctx->data); return ret; } static long dwarf2_get_leb128_as_signed(const unsigned char* ptr, const unsigned char** end) { long ret = 0; unsigned char byte; unsigned shift = 0; const unsigned size = sizeof(int) * 8; do { byte = dwarf2_get_byte(ptr++); ret |= (byte & 0x7f) << shift; shift += 7; } while (byte & 0x80); if (end) *end = ptr; /* as spec: sign bit of byte is 2nd high order bit (80x40) * -> 0x80 is used as flag. */ if ((shift < size) && (byte & 0x40)) { ret |= - (1 << shift); } return ret; } static long dwarf2_leb128_as_signed(dwarf2_traverse_context_t* ctx) { long ret = 0; assert(ctx); ret = dwarf2_get_leb128_as_signed(ctx->data, &ctx->data); return ret; } static unsigned dwarf2_leb128_length(const dwarf2_traverse_context_t* ctx) { unsigned ret; for (ret = 0; ctx->data[ret] & 0x80; ret++); return ret + 1; } /****************************************************************** * dwarf2_get_addr * * Returns an address. * We assume that in all cases word size from Dwarf matches the size of * addresses in platform where the exec is compiled. */ static unsigned long dwarf2_get_addr(const unsigned char* ptr, unsigned word_size) { unsigned long ret; switch (word_size) { case 4: ret = dwarf2_get_u4(ptr); break; case 8: ret = dwarf2_get_u8(ptr); break; default: FIXME("Unsupported Word Size %u\n", word_size); ret = 0; } return ret; } static unsigned long dwarf2_parse_addr(dwarf2_traverse_context_t* ctx) { unsigned long ret = dwarf2_get_addr(ctx->data, ctx->word_size); ctx->data += ctx->word_size; return ret; } static const char* dwarf2_debug_traverse_ctx(const dwarf2_traverse_context_t* ctx) { return wine_dbg_sprintf("ctx(%p)", ctx->data); } static const char* dwarf2_debug_ctx(const dwarf2_parse_context_t* ctx) { return wine_dbg_sprintf("ctx(%p,%s)", ctx, debugstr_w(ctx->module->module.ModuleName)); } static const char* dwarf2_debug_di(const dwarf2_debug_info_t* di) { return wine_dbg_sprintf("debug_info(abbrev:%p,symt:%p)", di->abbrev, di->symt); } static dwarf2_abbrev_entry_t* dwarf2_abbrev_table_find_entry(const struct sparse_array* abbrev_table, unsigned long entry_code) { assert( NULL != abbrev_table ); return sparse_array_find(abbrev_table, entry_code); } static void dwarf2_parse_abbrev_set(dwarf2_traverse_context_t* abbrev_ctx, struct sparse_array* abbrev_table, struct pool* pool) { unsigned long entry_code; dwarf2_abbrev_entry_t* abbrev_entry; dwarf2_abbrev_entry_attr_t* new = NULL; dwarf2_abbrev_entry_attr_t* last = NULL; unsigned long attribute; unsigned long form; assert( NULL != abbrev_ctx ); TRACE("%s, end at %p\n", dwarf2_debug_traverse_ctx(abbrev_ctx), abbrev_ctx->end_data); sparse_array_init(abbrev_table, sizeof(dwarf2_abbrev_entry_t), 32); while (abbrev_ctx->data < abbrev_ctx->end_data) { TRACE("now at %s\n", dwarf2_debug_traverse_ctx(abbrev_ctx)); entry_code = dwarf2_leb128_as_unsigned(abbrev_ctx); TRACE("found entry_code %lu\n", entry_code); if (!entry_code) { TRACE("NULL entry code at %s\n", dwarf2_debug_traverse_ctx(abbrev_ctx)); break; } abbrev_entry = sparse_array_add(abbrev_table, entry_code, pool); assert( NULL != abbrev_entry ); abbrev_entry->entry_code = entry_code; abbrev_entry->tag = dwarf2_leb128_as_unsigned(abbrev_ctx); abbrev_entry->have_child = dwarf2_parse_byte(abbrev_ctx); abbrev_entry->attrs = NULL; abbrev_entry->num_attr = 0; TRACE("table:(%p,#%u) entry_code(%lu) tag(0x%lx) have_child(%u) -> %p\n", abbrev_table, sparse_array_length(abbrev_table), entry_code, abbrev_entry->tag, abbrev_entry->have_child, abbrev_entry); last = NULL; while (1) { attribute = dwarf2_leb128_as_unsigned(abbrev_ctx); form = dwarf2_leb128_as_unsigned(abbrev_ctx); if (!attribute) break; new = pool_alloc(pool, sizeof(dwarf2_abbrev_entry_attr_t)); assert(new); new->attribute = attribute; new->form = form; new->next = NULL; if (abbrev_entry->attrs) last->next = new; else abbrev_entry->attrs = new; last = new; abbrev_entry->num_attr++; } } TRACE("found %u entries\n", sparse_array_length(abbrev_table)); } static void dwarf2_swallow_attribute(dwarf2_traverse_context_t* ctx, const dwarf2_abbrev_entry_attr_t* abbrev_attr) { unsigned step; TRACE("(attr:0x%lx,form:0x%lx)\n", abbrev_attr->attribute, abbrev_attr->form); switch (abbrev_attr->form) { case DW_FORM_ref_addr: case DW_FORM_addr: step = ctx->word_size; break; case DW_FORM_flag: case DW_FORM_data1: case DW_FORM_ref1: step = 1; break; case DW_FORM_data2: case DW_FORM_ref2: step = 2; break; case DW_FORM_data4: case DW_FORM_ref4: case DW_FORM_strp: step = 4; break; case DW_FORM_data8: case DW_FORM_ref8: step = 8; break; case DW_FORM_sdata: case DW_FORM_ref_udata: case DW_FORM_udata: step = dwarf2_leb128_length(ctx); break; case DW_FORM_string: step = strlen((const char*)ctx->data) + 1; break; case DW_FORM_block: step = dwarf2_leb128_as_unsigned(ctx); break; case DW_FORM_block1: step = dwarf2_parse_byte(ctx); break; case DW_FORM_block2: step = dwarf2_parse_u2(ctx); break; case DW_FORM_block4: step = dwarf2_parse_u4(ctx); break; default: FIXME("Unhandled attribute form %lx\n", abbrev_attr->form); return; } ctx->data += step; } static void dwarf2_fill_attr(const dwarf2_parse_context_t* ctx, const dwarf2_abbrev_entry_attr_t* abbrev_attr, const unsigned char* data, struct attribute* attr) { attr->form = abbrev_attr->form; switch (attr->form) { case DW_FORM_ref_addr: case DW_FORM_addr: attr->u.uvalue = dwarf2_get_addr(data, ctx->module->format_info[DFI_DWARF]->u.dwarf2_info->word_size); TRACE("addr<0x%lx>\n", attr->u.uvalue); break; case DW_FORM_flag: attr->u.uvalue = dwarf2_get_byte(data); TRACE("flag<0x%lx>\n", attr->u.uvalue); break; case DW_FORM_data1: attr->u.uvalue = dwarf2_get_byte(data); TRACE("data1<%lu>\n", attr->u.uvalue); break; case DW_FORM_data2: attr->u.uvalue = dwarf2_get_u2(data); TRACE("data2<%lu>\n", attr->u.uvalue); break; case DW_FORM_data4: attr->u.uvalue = dwarf2_get_u4(data); TRACE("data4<%lu>\n", attr->u.uvalue); break; case DW_FORM_data8: attr->u.lluvalue = dwarf2_get_u8(data); TRACE("data8<%s>\n", wine_dbgstr_longlong(attr->u.uvalue)); break; case DW_FORM_ref1: attr->u.uvalue = ctx->ref_offset + dwarf2_get_byte(data); TRACE("ref1<0x%lx>\n", attr->u.uvalue); break; case DW_FORM_ref2: attr->u.uvalue = ctx->ref_offset + dwarf2_get_u2(data); TRACE("ref2<0x%lx>\n", attr->u.uvalue); break; case DW_FORM_ref4: attr->u.uvalue = ctx->ref_offset + dwarf2_get_u4(data); TRACE("ref4<0x%lx>\n", attr->u.uvalue); break; case DW_FORM_ref8: FIXME("Unhandled 64 bit support\n"); break; case DW_FORM_sdata: attr->u.svalue = dwarf2_get_leb128_as_signed(data, NULL); break; case DW_FORM_ref_udata: attr->u.uvalue = dwarf2_get_leb128_as_unsigned(data, NULL); break; case DW_FORM_udata: attr->u.uvalue = dwarf2_get_leb128_as_unsigned(data, NULL); break; case DW_FORM_string: attr->u.string = (const char *)data; TRACE("string<%s>\n", attr->u.string); break; case DW_FORM_strp: { unsigned long offset = dwarf2_get_u4(data); attr->u.string = (const char*)ctx->sections[section_string].address + offset; } TRACE("strp<%s>\n", attr->u.string); break; case DW_FORM_block: attr->u.block.size = dwarf2_get_leb128_as_unsigned(data, &attr->u.block.ptr); break; case DW_FORM_block1: attr->u.block.size = dwarf2_get_byte(data); attr->u.block.ptr = data + 1; break; case DW_FORM_block2: attr->u.block.size = dwarf2_get_u2(data); attr->u.block.ptr = data + 2; break; case DW_FORM_block4: attr->u.block.size = dwarf2_get_u4(data); attr->u.block.ptr = data + 4; break; default: FIXME("Unhandled attribute form %lx\n", abbrev_attr->form); break; } } static BOOL dwarf2_find_attribute(const dwarf2_parse_context_t* ctx, const dwarf2_debug_info_t* di, unsigned at, struct attribute* attr) { unsigned i, ai = 0; dwarf2_abbrev_entry_attr_t* abbrev_attr; dwarf2_abbrev_entry_attr_t* abstract_abbrev_attr; while (di) { abstract_abbrev_attr = NULL; for (i = 0, abbrev_attr = di->abbrev->attrs; abbrev_attr; i++, abbrev_attr = abbrev_attr->next) { if (abbrev_attr->attribute == at) { dwarf2_fill_attr(ctx, abbrev_attr, di->data[i], attr); return TRUE; } if (abbrev_attr->attribute == DW_AT_abstract_origin && at != DW_AT_sibling) { abstract_abbrev_attr = abbrev_attr; ai = i; } } /* do we have an abstract origin debug entry to look into ? */ if (!abstract_abbrev_attr) break; dwarf2_fill_attr(ctx, abstract_abbrev_attr, di->data[ai], attr); if (!(di = sparse_array_find(&ctx->debug_info_table, attr->u.uvalue))) FIXME("Should have found the debug info entry\n"); } return FALSE; } static void dwarf2_load_one_entry(dwarf2_parse_context_t*, dwarf2_debug_info_t*, struct symt_compiland*); #define Wine_DW_no_register 0x7FFFFFFF static unsigned dwarf2_map_register(int regno) { if (regno == Wine_DW_no_register) { FIXME("What the heck map reg 0x%x\n",regno); return 0; } return dbghelp_current_cpu->map_dwarf_register(regno); } static enum location_error compute_location(dwarf2_traverse_context_t* ctx, struct location* loc, HANDLE hproc, const struct location* frame) { DWORD_PTR tmp, stack[64]; unsigned stk; unsigned char op; BOOL piece_found = FALSE; stack[stk = 0] = 0; loc->kind = loc_absolute; loc->reg = Wine_DW_no_register; while (ctx->data < ctx->end_data) { op = dwarf2_parse_byte(ctx); if (op >= DW_OP_lit0 && op <= DW_OP_lit31) stack[++stk] = op - DW_OP_lit0; else if (op >= DW_OP_reg0 && op <= DW_OP_reg31) { /* dbghelp APIs don't know how to cope with this anyway * (for example 'long long' stored in two registers) * FIXME: We should tell winedbg how to deal with it (sigh) */ if (!piece_found) { if (loc->reg != Wine_DW_no_register) FIXME("Only supporting one reg (%d -> %d)\n", loc->reg, dwarf2_map_register(op - DW_OP_reg0)); loc->reg = dwarf2_map_register(op - DW_OP_reg0); } loc->kind = loc_register; } else if (op >= DW_OP_breg0 && op <= DW_OP_breg31) { /* dbghelp APIs don't know how to cope with this anyway * (for example 'long long' stored in two registers) * FIXME: We should tell winedbg how to deal with it (sigh) */ if (!piece_found) { if (loc->reg != Wine_DW_no_register) FIXME("Only supporting one breg (%d -> %d)\n", loc->reg, dwarf2_map_register(op - DW_OP_breg0)); loc->reg = dwarf2_map_register(op - DW_OP_breg0); } stack[++stk] = dwarf2_leb128_as_signed(ctx); loc->kind = loc_regrel; } else switch (op) { case DW_OP_nop: break; case DW_OP_addr: stack[++stk] = dwarf2_parse_addr(ctx); break; case DW_OP_const1u: stack[++stk] = dwarf2_parse_byte(ctx); break; case DW_OP_const1s: stack[++stk] = dwarf2_parse_byte(ctx); break; case DW_OP_const2u: stack[++stk] = dwarf2_parse_u2(ctx); break; case DW_OP_const2s: stack[++stk] = dwarf2_parse_u2(ctx); break; case DW_OP_const4u: stack[++stk] = dwarf2_parse_u4(ctx); break; case DW_OP_const4s: stack[++stk] = dwarf2_parse_u4(ctx); break; case DW_OP_const8u: stack[++stk] = dwarf2_parse_u8(ctx); break; case DW_OP_const8s: stack[++stk] = dwarf2_parse_u8(ctx); break; case DW_OP_constu: stack[++stk] = dwarf2_leb128_as_unsigned(ctx); break; case DW_OP_consts: stack[++stk] = dwarf2_leb128_as_signed(ctx); break; case DW_OP_dup: stack[stk + 1] = stack[stk]; stk++; break; case DW_OP_drop: stk--; break; case DW_OP_over: stack[stk + 1] = stack[stk - 1]; stk++; break; case DW_OP_pick: stack[stk + 1] = stack[stk - dwarf2_parse_byte(ctx)]; stk++; break; case DW_OP_swap: tmp = stack[stk]; stack[stk] = stack[stk-1]; stack[stk-1] = tmp; break; case DW_OP_rot: tmp = stack[stk]; stack[stk] = stack[stk-1]; stack[stk-1] = stack[stk-2]; stack[stk-2] = tmp; break; case DW_OP_abs: stack[stk] = labs(stack[stk]); break; case DW_OP_neg: stack[stk] = -stack[stk]; break; case DW_OP_not: stack[stk] = ~stack[stk]; break; case DW_OP_and: stack[stk-1] &= stack[stk]; stk--; break; case DW_OP_or: stack[stk-1] |= stack[stk]; stk--; break; case DW_OP_minus: stack[stk-1] -= stack[stk]; stk--; break; case DW_OP_mul: stack[stk-1] *= stack[stk]; stk--; break; case DW_OP_plus: stack[stk-1] += stack[stk]; stk--; break; case DW_OP_xor: stack[stk-1] ^= stack[stk]; stk--; break; case DW_OP_shl: stack[stk-1] <<= stack[stk]; stk--; break; case DW_OP_shr: stack[stk-1] >>= stack[stk]; stk--; break; case DW_OP_plus_uconst: stack[stk] += dwarf2_leb128_as_unsigned(ctx); break; case DW_OP_shra: stack[stk-1] = stack[stk-1] / (1 << stack[stk]); stk--; break; case DW_OP_div: stack[stk-1] = stack[stk-1] / stack[stk]; stk--; break; case DW_OP_mod: stack[stk-1] = stack[stk-1] % stack[stk]; stk--; break; case DW_OP_ge: stack[stk-1] = (stack[stk-1] >= stack[stk]); stk--; break; case DW_OP_gt: stack[stk-1] = (stack[stk-1] > stack[stk]); stk--; break; case DW_OP_le: stack[stk-1] = (stack[stk-1] <= stack[stk]); stk--; break; case DW_OP_lt: stack[stk-1] = (stack[stk-1] < stack[stk]); stk--; break; case DW_OP_eq: stack[stk-1] = (stack[stk-1] == stack[stk]); stk--; break; case DW_OP_ne: stack[stk-1] = (stack[stk-1] != stack[stk]); stk--; break; case DW_OP_skip: tmp = dwarf2_parse_u2(ctx); ctx->data += tmp; break; case DW_OP_bra: tmp = dwarf2_parse_u2(ctx); if (!stack[stk--]) ctx->data += tmp; break; case DW_OP_regx: tmp = dwarf2_leb128_as_unsigned(ctx); if (!piece_found) { if (loc->reg != Wine_DW_no_register) FIXME("Only supporting one reg\n"); loc->reg = dwarf2_map_register(tmp); } loc->kind = loc_register; break; case DW_OP_bregx: tmp = dwarf2_leb128_as_unsigned(ctx); if (loc->reg != Wine_DW_no_register) FIXME("Only supporting one regx\n"); loc->reg = dwarf2_map_register(tmp); stack[++stk] = dwarf2_leb128_as_signed(ctx); loc->kind = loc_regrel; break; case DW_OP_fbreg: if (loc->reg != Wine_DW_no_register) FIXME("Only supporting one reg (%d -> -2)\n", loc->reg); if (frame && frame->kind == loc_register) { loc->kind = loc_regrel; loc->reg = frame->reg; stack[++stk] = dwarf2_leb128_as_signed(ctx); } else if (frame && frame->kind == loc_regrel) { loc->kind = loc_regrel; loc->reg = frame->reg; stack[++stk] = dwarf2_leb128_as_signed(ctx) + frame->offset; } else { /* FIXME: this could be later optimized by not recomputing * this very location expression */ loc->kind = loc_dwarf2_block; stack[++stk] = dwarf2_leb128_as_signed(ctx); } break; case DW_OP_piece: { unsigned sz = dwarf2_leb128_as_unsigned(ctx); WARN("Not handling OP_piece (size=%d)\n", sz); piece_found = TRUE; } break; case DW_OP_deref: if (!stk) { FIXME("Unexpected empty stack\n"); return loc_err_internal; } if (loc->reg != Wine_DW_no_register) { WARN("Too complex expression for deref\n"); return loc_err_too_complex; } if (hproc) { DWORD_PTR addr = stack[stk--]; DWORD_PTR deref; if (!ReadProcessMemory(hproc, (void*)addr, &deref, sizeof(deref), NULL)) { WARN("Couldn't read memory at %lx\n", addr); return loc_err_cant_read; } stack[++stk] = deref; } else { loc->kind = loc_dwarf2_block; } break; case DW_OP_deref_size: if (!stk) { FIXME("Unexpected empty stack\n"); return loc_err_internal; } if (loc->reg != Wine_DW_no_register) { WARN("Too complex expression for deref\n"); return loc_err_too_complex; } if (hproc) { DWORD_PTR addr = stack[stk--]; BYTE derefsize = dwarf2_parse_byte(ctx); DWORD64 deref; if (!ReadProcessMemory(hproc, (void*)addr, &deref, derefsize, NULL)) { WARN("Couldn't read memory at %lx\n", addr); return loc_err_cant_read; } switch (derefsize) { case 1: stack[++stk] = *(unsigned char*)&deref; break; case 2: stack[++stk] = *(unsigned short*)&deref; break; case 4: stack[++stk] = *(DWORD*)&deref; break; case 8: if (ctx->word_size >= derefsize) stack[++stk] = deref; break; } } else { loc->kind = loc_dwarf2_block; } break; case DW_OP_stack_value: /* Expected behaviour is that this is the last instruction of this * expression and just the "top of stack" value should be put to loc->offset. */ break; default: if (op < DW_OP_lo_user) /* as DW_OP_hi_user is 0xFF, we don't need to test against it */ FIXME("Unhandled attr op: %x\n", op); /* FIXME else unhandled extension */ return loc_err_internal; } } loc->offset = stack[stk]; return 0; } static BOOL dwarf2_compute_location_attr(dwarf2_parse_context_t* ctx, const dwarf2_debug_info_t* di, unsigned long dw, struct location* loc, const struct location* frame) { struct attribute xloc; if (!dwarf2_find_attribute(ctx, di, dw, &xloc)) return FALSE; switch (xloc.form) { case DW_FORM_data1: case DW_FORM_data2: case DW_FORM_udata: case DW_FORM_sdata: loc->kind = loc_absolute; loc->reg = 0; loc->offset = xloc.u.uvalue; return TRUE; case DW_FORM_data4: case DW_FORM_data8: loc->kind = loc_dwarf2_location_list; loc->reg = Wine_DW_no_register; loc->offset = xloc.u.uvalue; return TRUE; case DW_FORM_block: case DW_FORM_block1: case DW_FORM_block2: case DW_FORM_block4: break; default: FIXME("Unsupported yet form %lx\n", xloc.form); return FALSE; } /* assume we have a block form */ if (xloc.u.block.size) { dwarf2_traverse_context_t lctx; enum location_error err; lctx.data = xloc.u.block.ptr; lctx.end_data = xloc.u.block.ptr + xloc.u.block.size; lctx.word_size = ctx->module->format_info[DFI_DWARF]->u.dwarf2_info->word_size; err = compute_location(&lctx, loc, NULL, frame); if (err < 0) { loc->kind = loc_error; loc->reg = err; } else if (loc->kind == loc_dwarf2_block) { unsigned* ptr = pool_alloc(&ctx->module->pool, sizeof(unsigned) + xloc.u.block.size); *ptr = xloc.u.block.size; memcpy(ptr + 1, xloc.u.block.ptr, xloc.u.block.size); loc->offset = (unsigned long)ptr; } } return TRUE; } static struct symt* dwarf2_lookup_type(dwarf2_parse_context_t* ctx, const dwarf2_debug_info_t* di) { struct attribute attr; if (dwarf2_find_attribute(ctx, di, DW_AT_type, &attr)) { dwarf2_debug_info_t* type; type = sparse_array_find(&ctx->debug_info_table, attr.u.uvalue); if (!type) FIXME("Unable to find back reference to type %lx\n", attr.u.uvalue); if (!type->symt) { /* load the debug info entity */ dwarf2_load_one_entry(ctx, type, NULL); } return type->symt; } return NULL; } /****************************************************************** * dwarf2_read_one_debug_info * * Loads into memory one debug info entry, and recursively its children (if any) */ static BOOL dwarf2_read_one_debug_info(dwarf2_parse_context_t* ctx, dwarf2_traverse_context_t* traverse, dwarf2_debug_info_t** pdi) { const dwarf2_abbrev_entry_t*abbrev; unsigned long entry_code; unsigned long offset; dwarf2_debug_info_t* di; dwarf2_debug_info_t* child; dwarf2_debug_info_t** where; dwarf2_abbrev_entry_attr_t* attr; unsigned i; struct attribute sibling; offset = traverse->data - ctx->sections[ctx->section].address; entry_code = dwarf2_leb128_as_unsigned(traverse); TRACE("found entry_code %lu at 0x%lx\n", entry_code, offset); if (!entry_code) { *pdi = NULL; return TRUE; } abbrev = dwarf2_abbrev_table_find_entry(&ctx->abbrev_table, entry_code); if (!abbrev) { WARN("Cannot find abbrev entry for %lu at 0x%lx\n", entry_code, offset); return FALSE; } di = sparse_array_add(&ctx->debug_info_table, offset, &ctx->pool); if (!di) return FALSE; di->abbrev = abbrev; di->symt = NULL; if (abbrev->num_attr) { di->data = pool_alloc(&ctx->pool, abbrev->num_attr * sizeof(const char*)); for (i = 0, attr = abbrev->attrs; attr; i++, attr = attr->next) { di->data[i] = traverse->data; dwarf2_swallow_attribute(traverse, attr); } } else di->data = NULL; if (abbrev->have_child) { vector_init(&di->children, sizeof(dwarf2_debug_info_t*), 16); while (traverse->data < traverse->end_data) { if (!dwarf2_read_one_debug_info(ctx, traverse, &child)) return FALSE; if (!child) break; where = vector_add(&di->children, &ctx->pool); if (!where) return FALSE; *where = child; } } if (dwarf2_find_attribute(ctx, di, DW_AT_sibling, &sibling) && traverse->data != ctx->sections[ctx->section].address + sibling.u.uvalue) { WARN("setting cursor for %s to next sibling <0x%lx>\n", dwarf2_debug_traverse_ctx(traverse), sibling.u.uvalue); traverse->data = ctx->sections[ctx->section].address + sibling.u.uvalue; } *pdi = di; return TRUE; } static struct symt* dwarf2_parse_base_type(dwarf2_parse_context_t* ctx, dwarf2_debug_info_t* di) { struct attribute name; struct attribute size; struct attribute encoding; enum BasicType bt; int cache_idx = -1; if (di->symt) return di->symt; TRACE("%s, for %s\n", dwarf2_debug_ctx(ctx), dwarf2_debug_di(di)); if (!dwarf2_find_attribute(ctx, di, DW_AT_name, &name)) name.u.string = NULL; if (!dwarf2_find_attribute(ctx, di, DW_AT_byte_size, &size)) size.u.uvalue = 0; if (!dwarf2_find_attribute(ctx, di, DW_AT_encoding, &encoding)) encoding.u.uvalue = DW_ATE_void; switch (encoding.u.uvalue) { case DW_ATE_void: bt = btVoid; break; case DW_ATE_address: bt = btULong; break; case DW_ATE_boolean: bt = btBool; break; case DW_ATE_complex_float: bt = btComplex; break; case DW_ATE_float: bt = btFloat; break; case DW_ATE_signed: bt = btInt; break; case DW_ATE_unsigned: bt = btUInt; break; case DW_ATE_signed_char: bt = btChar; break; case DW_ATE_unsigned_char: bt = btChar; break; default: bt = btNoType; break; } di->symt = &symt_new_basic(ctx->module, bt, name.u.string, size.u.uvalue)->symt; switch (bt) { case btVoid: assert(size.u.uvalue == 0); cache_idx = sc_void; break; case btInt: switch (size.u.uvalue) { case 1: cache_idx = sc_int1; break; case 2: cache_idx = sc_int2; break; case 4: cache_idx = sc_int4; break; } break; default: break; } if (cache_idx != -1 && !ctx->symt_cache[cache_idx]) ctx->symt_cache[cache_idx] = di->symt; if (di->abbrev->have_child) FIXME("Unsupported children\n"); return di->symt; } static struct symt* dwarf2_parse_typedef(dwarf2_parse_context_t* ctx, dwarf2_debug_info_t* di) { struct symt* ref_type; struct attribute name; if (di->symt) return di->symt; TRACE("%s, for %lu\n", dwarf2_debug_ctx(ctx), di->abbrev->entry_code); if (!dwarf2_find_attribute(ctx, di, DW_AT_name, &name)) name.u.string = NULL; ref_type = dwarf2_lookup_type(ctx, di); if (name.u.string) di->symt = &symt_new_typedef(ctx->module, ref_type, name.u.string)->symt; if (di->abbrev->have_child) FIXME("Unsupported children\n"); return di->symt; } static struct symt* dwarf2_parse_pointer_type(dwarf2_parse_context_t* ctx, dwarf2_debug_info_t* di) { struct symt* ref_type; struct attribute size; if (di->symt) return di->symt; TRACE("%s, for %s\n", dwarf2_debug_ctx(ctx), dwarf2_debug_di(di)); if (!dwarf2_find_attribute(ctx, di, DW_AT_byte_size, &size)) size.u.uvalue = 0; if (!(ref_type = dwarf2_lookup_type(ctx, di))) { ref_type = ctx->symt_cache[sc_void]; assert(ref_type); } di->symt = &symt_new_pointer(ctx->module, ref_type)->symt; if (di->abbrev->have_child) FIXME("Unsupported children\n"); return di->symt; } static struct symt* dwarf2_parse_array_type(dwarf2_parse_context_t* ctx, dwarf2_debug_info_t* di) { struct symt* ref_type; struct symt* idx_type = NULL; struct attribute min, max, cnt; dwarf2_debug_info_t* child; unsigned int i; if (di->symt) return di->symt; TRACE("%s, for %s\n", dwarf2_debug_ctx(ctx), dwarf2_debug_di(di)); ref_type = dwarf2_lookup_type(ctx, di); if (!di->abbrev->have_child) { /* fake an array with unknown size */ /* FIXME: int4 even on 64bit machines??? */ idx_type = ctx->symt_cache[sc_int4]; min.u.uvalue = 0; max.u.uvalue = -1; } else for (i = 0; i < vector_length(&di->children); i++) { child = *(dwarf2_debug_info_t**)vector_at(&di->children, i); switch (child->abbrev->tag) { case DW_TAG_subrange_type: idx_type = dwarf2_lookup_type(ctx, child); if (!dwarf2_find_attribute(ctx, child, DW_AT_lower_bound, &min)) min.u.uvalue = 0; if (!dwarf2_find_attribute(ctx, child, DW_AT_upper_bound, &max)) max.u.uvalue = 0; if (dwarf2_find_attribute(ctx, child, DW_AT_count, &cnt)) max.u.uvalue = min.u.uvalue + cnt.u.uvalue; break; default: FIXME("Unhandled Tag type 0x%lx at %s, for %s\n", child->abbrev->tag, dwarf2_debug_ctx(ctx), dwarf2_debug_di(di)); break; } } di->symt = &symt_new_array(ctx->module, min.u.uvalue, max.u.uvalue, ref_type, idx_type)->symt; return di->symt; } static struct symt* dwarf2_parse_const_type(dwarf2_parse_context_t* ctx, dwarf2_debug_info_t* di) { struct symt* ref_type; if (di->symt) return di->symt; TRACE("%s, for %s\n", dwarf2_debug_ctx(ctx), dwarf2_debug_di(di)); ref_type = dwarf2_lookup_type(ctx, di); if (di->abbrev->have_child) FIXME("Unsupported children\n"); di->symt = ref_type; return ref_type; } static struct symt* dwarf2_parse_volatile_type(dwarf2_parse_context_t* ctx, dwarf2_debug_info_t* di) { struct symt* ref_type; if (di->symt) return di->symt; TRACE("%s, for %s\n", dwarf2_debug_ctx(ctx), dwarf2_debug_di(di)); ref_type = dwarf2_lookup_type(ctx, di); if (di->abbrev->have_child) FIXME("Unsupported children\n"); di->symt = ref_type; return ref_type; } static struct symt* dwarf2_parse_reference_type(dwarf2_parse_context_t* ctx, dwarf2_debug_info_t* di) { struct symt* ref_type = NULL; if (di->symt) return di->symt; TRACE("%s, for %s\n", dwarf2_debug_ctx(ctx), dwarf2_debug_di(di)); ref_type = dwarf2_lookup_type(ctx, di); /* FIXME: for now, we hard-wire C++ references to pointers */ di->symt = &symt_new_pointer(ctx->module, ref_type)->symt; if (di->abbrev->have_child) FIXME("Unsupported children\n"); return di->symt; } static void dwarf2_parse_udt_member(dwarf2_parse_context_t* ctx, const dwarf2_debug_info_t* di, struct symt_udt* parent) { struct symt* elt_type; struct attribute name; struct attribute bit_size; struct attribute bit_offset; struct location loc; assert(parent); TRACE("%s, for %s\n", dwarf2_debug_ctx(ctx), dwarf2_debug_di(di)); if (!dwarf2_find_attribute(ctx, di, DW_AT_name, &name)) name.u.string = NULL; elt_type = dwarf2_lookup_type(ctx, di); if (dwarf2_compute_location_attr(ctx, di, DW_AT_data_member_location, &loc, NULL)) { if (loc.kind != loc_absolute) { FIXME("Found register, while not expecting it\n"); loc.offset = 0; } else TRACE("found member_location at %s -> %lu\n", dwarf2_debug_ctx(ctx), loc.offset); } else loc.offset = 0; if (!dwarf2_find_attribute(ctx, di, DW_AT_bit_size, &bit_size)) bit_size.u.uvalue = 0; if (dwarf2_find_attribute(ctx, di, DW_AT_bit_offset, &bit_offset)) { /* FIXME: we should only do this when implementation is LSB (which is * the case on i386 processors) */ struct attribute nbytes; if (!dwarf2_find_attribute(ctx, di, DW_AT_byte_size, &nbytes)) { DWORD64 size; nbytes.u.uvalue = symt_get_info(ctx->module, elt_type, TI_GET_LENGTH, &size) ? (unsigned long)size : 0; } bit_offset.u.uvalue = nbytes.u.uvalue * 8 - bit_offset.u.uvalue - bit_size.u.uvalue; } else bit_offset.u.uvalue = 0; symt_add_udt_element(ctx->module, parent, name.u.string, elt_type, (loc.offset << 3) + bit_offset.u.uvalue, bit_size.u.uvalue); if (di->abbrev->have_child) FIXME("Unsupported children\n"); } static struct symt* dwarf2_parse_udt_type(dwarf2_parse_context_t* ctx, dwarf2_debug_info_t* di, enum UdtKind udt) { struct attribute name; struct attribute size; if (di->symt) return di->symt; TRACE("%s, for %s\n", dwarf2_debug_ctx(ctx), dwarf2_debug_di(di)); if (!dwarf2_find_attribute(ctx, di, DW_AT_name, &name)) name.u.string = NULL; if (!dwarf2_find_attribute(ctx, di, DW_AT_byte_size, &size)) size.u.uvalue = 0; di->symt = &symt_new_udt(ctx->module, name.u.string, size.u.uvalue, udt)->symt; if (di->abbrev->have_child) /** any interest to not have child ? */ { dwarf2_debug_info_t* child; unsigned int i; for (i=0; ichildren); i++) { child = *(dwarf2_debug_info_t**)vector_at(&di->children, i); switch (child->abbrev->tag) { case DW_TAG_member: /* FIXME: should I follow the sibling stuff ?? */ dwarf2_parse_udt_member(ctx, child, (struct symt_udt*)di->symt); break; case DW_TAG_enumeration_type: dwarf2_parse_enumeration_type(ctx, child); break; case DW_TAG_structure_type: case DW_TAG_class_type: case DW_TAG_union_type: case DW_TAG_typedef: /* FIXME: we need to handle nested udt definitions */ case DW_TAG_inheritance: case DW_TAG_subprogram: case DW_TAG_template_type_param: case DW_TAG_template_value_param: case DW_TAG_variable: /* FIXME: some C++ related stuff */ break; default: FIXME("Unhandled Tag type 0x%lx at %s, for %s\n", child->abbrev->tag, dwarf2_debug_ctx(ctx), dwarf2_debug_di(di)); break; } } } return di->symt; } static void dwarf2_parse_enumerator(dwarf2_parse_context_t* ctx, const dwarf2_debug_info_t* di, struct symt_enum* parent) { struct attribute name; struct attribute value; TRACE("%s, for %s\n", dwarf2_debug_ctx(ctx), dwarf2_debug_di(di)); if (!dwarf2_find_attribute(ctx, di, DW_AT_name, &name)) return; if (!dwarf2_find_attribute(ctx, di, DW_AT_const_value, &value)) value.u.svalue = 0; symt_add_enum_element(ctx->module, parent, name.u.string, value.u.svalue); if (di->abbrev->have_child) FIXME("Unsupported children\n"); } static struct symt* dwarf2_parse_enumeration_type(dwarf2_parse_context_t* ctx, dwarf2_debug_info_t* di) { struct attribute name; struct attribute size; struct symt_basic* basetype; if (di->symt) return di->symt; TRACE("%s, for %s\n", dwarf2_debug_ctx(ctx), dwarf2_debug_di(di)); if (!dwarf2_find_attribute(ctx, di, DW_AT_name, &name)) name.u.string = NULL; if (!dwarf2_find_attribute(ctx, di, DW_AT_byte_size, &size)) size.u.uvalue = 4; switch (size.u.uvalue) /* FIXME: that's wrong */ { case 1: basetype = symt_new_basic(ctx->module, btInt, "char", 1); break; case 2: basetype = symt_new_basic(ctx->module, btInt, "short", 2); break; default: case 4: basetype = symt_new_basic(ctx->module, btInt, "int", 4); break; } di->symt = &symt_new_enum(ctx->module, name.u.string, &basetype->symt)->symt; if (di->abbrev->have_child) /* any interest to not have child ? */ { dwarf2_debug_info_t* child; unsigned int i; /* FIXME: should we use the sibling stuff ?? */ for (i=0; ichildren); i++) { child = *(dwarf2_debug_info_t**)vector_at(&di->children, i); switch (child->abbrev->tag) { case DW_TAG_enumerator: dwarf2_parse_enumerator(ctx, child, (struct symt_enum*)di->symt); break; default: FIXME("Unhandled Tag type 0x%lx at %s, for %s\n", di->abbrev->tag, dwarf2_debug_ctx(ctx), dwarf2_debug_di(di)); } } } return di->symt; } /* structure used to pass information around when parsing a subprogram */ typedef struct dwarf2_subprogram_s { dwarf2_parse_context_t* ctx; struct symt_compiland* compiland; struct symt_function* func; BOOL non_computed_variable; struct location frame; } dwarf2_subprogram_t; /****************************************************************** * dwarf2_parse_variable * * Parses any variable (parameter, local/global variable) */ static void dwarf2_parse_variable(dwarf2_subprogram_t* subpgm, struct symt_block* block, dwarf2_debug_info_t* di) { struct symt* param_type; struct attribute name, value; struct location loc; BOOL is_pmt; TRACE("%s, for %s\n", dwarf2_debug_ctx(subpgm->ctx), dwarf2_debug_di(di)); is_pmt = !block && di->abbrev->tag == DW_TAG_formal_parameter; param_type = dwarf2_lookup_type(subpgm->ctx, di); if (!dwarf2_find_attribute(subpgm->ctx, di, DW_AT_name, &name)) { /* cannot do much without the name, the functions below won't like it. */ return; } if (dwarf2_compute_location_attr(subpgm->ctx, di, DW_AT_location, &loc, &subpgm->frame)) { struct attribute ext; TRACE("found parameter %s (kind=%d, offset=%ld, reg=%d) at %s\n", name.u.string, loc.kind, loc.offset, loc.reg, dwarf2_debug_ctx(subpgm->ctx)); switch (loc.kind) { case loc_error: break; case loc_absolute: /* it's a global variable */ /* FIXME: we don't handle its scope yet */ if (!dwarf2_find_attribute(subpgm->ctx, di, DW_AT_external, &ext)) ext.u.uvalue = 0; symt_new_global_variable(subpgm->ctx->module, subpgm->compiland, name.u.string, !ext.u.uvalue, subpgm->ctx->load_offset + loc.offset, 0, param_type); break; default: subpgm->non_computed_variable = TRUE; /* fall through */ case loc_register: case loc_regrel: /* either a pmt/variable relative to frame pointer or * pmt/variable in a register */ assert(subpgm->func); symt_add_func_local(subpgm->ctx->module, subpgm->func, is_pmt ? DataIsParam : DataIsLocal, &loc, block, param_type, name.u.string); break; } } else if (dwarf2_find_attribute(subpgm->ctx, di, DW_AT_const_value, &value)) { VARIANT v; if (subpgm->func) WARN("Unsupported constant %s in function\n", name.u.string); if (is_pmt) FIXME("Unsupported constant (parameter) %s in function\n", name.u.string); switch (value.form) { case DW_FORM_data1: case DW_FORM_data2: case DW_FORM_data4: case DW_FORM_udata: case DW_FORM_addr: v.n1.n2.vt = VT_UI4; v.n1.n2.n3.lVal = value.u.uvalue; break; case DW_FORM_data8: v.n1.n2.vt = VT_UI8; v.n1.n2.n3.llVal = value.u.lluvalue; break; case DW_FORM_sdata: v.n1.n2.vt = VT_I4; v.n1.n2.n3.lVal = value.u.svalue; break; case DW_FORM_strp: case DW_FORM_string: /* FIXME: native doesn't report const strings from here !! * however, the value of the string is in the code somewhere */ v.n1.n2.vt = VT_I1 | VT_BYREF; v.n1.n2.n3.byref = pool_strdup(&subpgm->ctx->module->pool, value.u.string); break; case DW_FORM_block: case DW_FORM_block1: case DW_FORM_block2: case DW_FORM_block4: v.n1.n2.vt = VT_I4; switch (value.u.block.size) { case 1: v.n1.n2.n3.lVal = *(BYTE*)value.u.block.ptr; break; case 2: v.n1.n2.n3.lVal = *(USHORT*)value.u.block.ptr; break; case 4: v.n1.n2.n3.lVal = *(DWORD*)value.u.block.ptr; break; default: v.n1.n2.vt = VT_I1 | VT_BYREF; v.n1.n2.n3.byref = pool_alloc(&subpgm->ctx->module->pool, value.u.block.size); memcpy(v.n1.n2.n3.byref, value.u.block.ptr, value.u.block.size); } break; default: FIXME("Unsupported form for const value %s (%lx)\n", name.u.string, value.form); v.n1.n2.vt = VT_EMPTY; } di->symt = &symt_new_constant(subpgm->ctx->module, subpgm->compiland, name.u.string, param_type, &v)->symt; } else { /* variable has been optimiezd away... report anyway */ loc.kind = loc_error; loc.reg = loc_err_no_location; if (subpgm->func) { symt_add_func_local(subpgm->ctx->module, subpgm->func, is_pmt ? DataIsParam : DataIsLocal, &loc, block, param_type, name.u.string); } else { WARN("dropping global variable %s which has been optimized away\n", name.u.string); } } if (is_pmt && subpgm->func && subpgm->func->type) symt_add_function_signature_parameter(subpgm->ctx->module, (struct symt_function_signature*)subpgm->func->type, param_type); if (di->abbrev->have_child) FIXME("Unsupported children\n"); } static void dwarf2_parse_subprogram_label(dwarf2_subprogram_t* subpgm, const dwarf2_debug_info_t* di) { struct attribute name; struct attribute low_pc; struct location loc; TRACE("%s, for %s\n", dwarf2_debug_ctx(subpgm->ctx), dwarf2_debug_di(di)); if (!dwarf2_find_attribute(subpgm->ctx, di, DW_AT_low_pc, &low_pc)) low_pc.u.uvalue = 0; if (!dwarf2_find_attribute(subpgm->ctx, di, DW_AT_name, &name)) name.u.string = NULL; loc.kind = loc_absolute; loc.offset = subpgm->ctx->load_offset + low_pc.u.uvalue; symt_add_function_point(subpgm->ctx->module, subpgm->func, SymTagLabel, &loc, name.u.string); } static void dwarf2_parse_subprogram_block(dwarf2_subprogram_t* subpgm, struct symt_block* parent_block, const dwarf2_debug_info_t* di); static void dwarf2_parse_inlined_subroutine(dwarf2_subprogram_t* subpgm, struct symt_block* parent_block, const dwarf2_debug_info_t* di) { struct symt_block* block; struct attribute low_pc; struct attribute high_pc; TRACE("%s, for %s\n", dwarf2_debug_ctx(subpgm->ctx), dwarf2_debug_di(di)); if (!dwarf2_find_attribute(subpgm->ctx, di, DW_AT_low_pc, &low_pc)) low_pc.u.uvalue = 0; if (!dwarf2_find_attribute(subpgm->ctx, di, DW_AT_high_pc, &high_pc)) high_pc.u.uvalue = 0; block = symt_open_func_block(subpgm->ctx->module, subpgm->func, parent_block, subpgm->ctx->load_offset + low_pc.u.uvalue - subpgm->func->address, high_pc.u.uvalue - low_pc.u.uvalue); if (di->abbrev->have_child) /** any interest to not have child ? */ { dwarf2_debug_info_t* child; unsigned int i; for (i=0; ichildren); i++) { child = *(dwarf2_debug_info_t**)vector_at(&di->children, i); switch (child->abbrev->tag) { case DW_TAG_formal_parameter: case DW_TAG_variable: dwarf2_parse_variable(subpgm, block, child); break; case DW_TAG_lexical_block: dwarf2_parse_subprogram_block(subpgm, block, child); break; case DW_TAG_inlined_subroutine: dwarf2_parse_inlined_subroutine(subpgm, block, child); break; case DW_TAG_label: dwarf2_parse_subprogram_label(subpgm, child); break; default: FIXME("Unhandled Tag type 0x%lx at %s, for %s\n", child->abbrev->tag, dwarf2_debug_ctx(subpgm->ctx), dwarf2_debug_di(di)); } } } symt_close_func_block(subpgm->ctx->module, subpgm->func, block, 0); } static void dwarf2_parse_subprogram_block(dwarf2_subprogram_t* subpgm, struct symt_block* parent_block, const dwarf2_debug_info_t* di) { struct symt_block* block; struct attribute low_pc; struct attribute high_pc; TRACE("%s, for %s\n", dwarf2_debug_ctx(subpgm->ctx), dwarf2_debug_di(di)); if (!dwarf2_find_attribute(subpgm->ctx, di, DW_AT_low_pc, &low_pc)) low_pc.u.uvalue = 0; if (!dwarf2_find_attribute(subpgm->ctx, di, DW_AT_high_pc, &high_pc)) high_pc.u.uvalue = 0; block = symt_open_func_block(subpgm->ctx->module, subpgm->func, parent_block, subpgm->ctx->load_offset + low_pc.u.uvalue - subpgm->func->address, high_pc.u.uvalue - low_pc.u.uvalue); if (di->abbrev->have_child) /** any interest to not have child ? */ { dwarf2_debug_info_t* child; unsigned int i; for (i=0; ichildren); i++) { child = *(dwarf2_debug_info_t**)vector_at(&di->children, i); switch (child->abbrev->tag) { case DW_TAG_inlined_subroutine: dwarf2_parse_inlined_subroutine(subpgm, block, child); break; case DW_TAG_variable: dwarf2_parse_variable(subpgm, block, child); break; case DW_TAG_lexical_block: dwarf2_parse_subprogram_block(subpgm, block, child); break; case DW_TAG_subprogram: /* FIXME: likely a declaration (to be checked) * skip it for now */ break; case DW_TAG_formal_parameter: /* FIXME: likely elements for exception handling (GCC flavor) * Skip it for now */ break; case DW_TAG_label: dwarf2_parse_subprogram_label(subpgm, child); break; case DW_TAG_class_type: case DW_TAG_structure_type: case DW_TAG_union_type: case DW_TAG_enumeration_type: case DW_TAG_typedef: /* the type referred to will be loaded when we need it, so skip it */ break; default: FIXME("Unhandled Tag type 0x%lx at %s, for %s\n", child->abbrev->tag, dwarf2_debug_ctx(subpgm->ctx), dwarf2_debug_di(di)); } } } symt_close_func_block(subpgm->ctx->module, subpgm->func, block, 0); } static struct symt* dwarf2_parse_subprogram(dwarf2_parse_context_t* ctx, dwarf2_debug_info_t* di, struct symt_compiland* compiland) { struct attribute name; struct attribute low_pc; struct attribute high_pc; struct attribute is_decl; struct attribute inline_flags; struct symt* ret_type; struct symt_function_signature* sig_type; dwarf2_subprogram_t subpgm; if (di->symt) return di->symt; TRACE("%s, for %s\n", dwarf2_debug_ctx(ctx), dwarf2_debug_di(di)); if (!dwarf2_find_attribute(ctx, di, DW_AT_name, &name)) { WARN("No name for function... dropping function\n"); return NULL; } /* if it's an abstract representation of an inline function, there should be * a concrete object that we'll handle */ if (dwarf2_find_attribute(ctx, di, DW_AT_inline, &inline_flags)) { TRACE("Function %s declared as inlined (%ld)... skipping\n", name.u.string ? name.u.string : "(null)", inline_flags.u.uvalue); return NULL; } if (!dwarf2_find_attribute(ctx, di, DW_AT_low_pc, &low_pc)) low_pc.u.uvalue = 0; if (!dwarf2_find_attribute(ctx, di, DW_AT_high_pc, &high_pc)) high_pc.u.uvalue = 0; /* As functions (defined as inline assembly) get debug info with dwarf * (not the case for stabs), we just drop Wine's thunks here... * Actual thunks will be created in elf_module from the symbol table */ if (elf_is_in_thunk_area(ctx->load_offset + low_pc.u.uvalue, ctx->thunks) >= 0) return NULL; if (!dwarf2_find_attribute(ctx, di, DW_AT_declaration, &is_decl)) is_decl.u.uvalue = 0; if (!(ret_type = dwarf2_lookup_type(ctx, di))) { ret_type = ctx->symt_cache[sc_void]; assert(ret_type); } /* FIXME: assuming C source code */ sig_type = symt_new_function_signature(ctx->module, ret_type, CV_CALL_FAR_C); if (!is_decl.u.uvalue) { subpgm.func = symt_new_function(ctx->module, compiland, name.u.string, ctx->load_offset + low_pc.u.uvalue, high_pc.u.uvalue - low_pc.u.uvalue, &sig_type->symt); di->symt = &subpgm.func->symt; } else subpgm.func = NULL; subpgm.ctx = ctx; subpgm.compiland = compiland; if (!dwarf2_compute_location_attr(ctx, di, DW_AT_frame_base, &subpgm.frame, NULL)) { /* on stack !! */ subpgm.frame.kind = loc_regrel; subpgm.frame.reg = 0; subpgm.frame.offset = 0; } subpgm.non_computed_variable = FALSE; if (di->abbrev->have_child) /** any interest to not have child ? */ { dwarf2_debug_info_t* child; unsigned int i; for (i=0; ichildren); i++) { child = *(dwarf2_debug_info_t**)vector_at(&di->children, i); switch (child->abbrev->tag) { case DW_TAG_variable: case DW_TAG_formal_parameter: dwarf2_parse_variable(&subpgm, NULL, child); break; case DW_TAG_lexical_block: dwarf2_parse_subprogram_block(&subpgm, NULL, child); break; case DW_TAG_inlined_subroutine: dwarf2_parse_inlined_subroutine(&subpgm, NULL, child); break; case DW_TAG_subprogram: /* FIXME: likely a declaration (to be checked) * skip it for now */ break; case DW_TAG_label: dwarf2_parse_subprogram_label(&subpgm, child); break; case DW_TAG_class_type: case DW_TAG_structure_type: case DW_TAG_union_type: case DW_TAG_enumeration_type: case DW_TAG_typedef: /* the type referred to will be loaded when we need it, so skip it */ break; case DW_TAG_unspecified_parameters: case DW_TAG_template_type_param: case DW_TAG_template_value_param: /* FIXME: no support in dbghelp's internals so far */ break; default: FIXME("Unhandled Tag type 0x%lx at %s, for %s\n", child->abbrev->tag, dwarf2_debug_ctx(ctx), dwarf2_debug_di(di)); } } } if (subpgm.non_computed_variable || subpgm.frame.kind >= loc_user) { symt_add_function_point(ctx->module, subpgm.func, SymTagCustom, &subpgm.frame, NULL); } if (subpgm.func) symt_normalize_function(subpgm.ctx->module, subpgm.func); return di->symt; } static struct symt* dwarf2_parse_subroutine_type(dwarf2_parse_context_t* ctx, dwarf2_debug_info_t* di) { struct symt* ret_type; struct symt_function_signature* sig_type; if (di->symt) return di->symt; TRACE("%s, for %s\n", dwarf2_debug_ctx(ctx), dwarf2_debug_di(di)); if (!(ret_type = dwarf2_lookup_type(ctx, di))) { ret_type = ctx->symt_cache[sc_void]; assert(ret_type); } /* FIXME: assuming C source code */ sig_type = symt_new_function_signature(ctx->module, ret_type, CV_CALL_FAR_C); if (di->abbrev->have_child) /** any interest to not have child ? */ { dwarf2_debug_info_t* child; unsigned int i; for (i=0; ichildren); i++) { child = *(dwarf2_debug_info_t**)vector_at(&di->children, i); switch (child->abbrev->tag) { case DW_TAG_formal_parameter: symt_add_function_signature_parameter(ctx->module, sig_type, dwarf2_lookup_type(ctx, child)); break; case DW_TAG_unspecified_parameters: WARN("Unsupported unspecified parameters\n"); break; } } } return di->symt = &sig_type->symt; } static void dwarf2_load_one_entry(dwarf2_parse_context_t* ctx, dwarf2_debug_info_t* di, struct symt_compiland* compiland) { switch (di->abbrev->tag) { case DW_TAG_typedef: dwarf2_parse_typedef(ctx, di); break; case DW_TAG_base_type: dwarf2_parse_base_type(ctx, di); break; case DW_TAG_pointer_type: dwarf2_parse_pointer_type(ctx, di); break; case DW_TAG_class_type: dwarf2_parse_udt_type(ctx, di, UdtClass); break; case DW_TAG_structure_type: dwarf2_parse_udt_type(ctx, di, UdtStruct); break; case DW_TAG_union_type: dwarf2_parse_udt_type(ctx, di, UdtUnion); break; case DW_TAG_array_type: dwarf2_parse_array_type(ctx, di); break; case DW_TAG_const_type: dwarf2_parse_const_type(ctx, di); break; case DW_TAG_volatile_type: dwarf2_parse_volatile_type(ctx, di); break; case DW_TAG_reference_type: dwarf2_parse_reference_type(ctx, di); break; case DW_TAG_enumeration_type: dwarf2_parse_enumeration_type(ctx, di); break; case DW_TAG_subprogram: dwarf2_parse_subprogram(ctx, di, compiland); break; case DW_TAG_subroutine_type: dwarf2_parse_subroutine_type(ctx, di); break; case DW_TAG_variable: { dwarf2_subprogram_t subpgm; subpgm.ctx = ctx; subpgm.compiland = compiland; subpgm.func = NULL; subpgm.frame.kind = loc_absolute; subpgm.frame.offset = 0; subpgm.frame.reg = Wine_DW_no_register; dwarf2_parse_variable(&subpgm, NULL, di); } break; /* silence a couple of C++ defines */ case DW_TAG_namespace: case DW_TAG_imported_module: case DW_TAG_imported_declaration: break; default: FIXME("Unhandled Tag type 0x%lx at %s, for %lu\n", di->abbrev->tag, dwarf2_debug_ctx(ctx), di->abbrev->entry_code); } } static void dwarf2_set_line_number(struct module* module, unsigned long address, const struct vector* v, unsigned file, unsigned line) { struct symt_function* func; struct symt_ht* symt; unsigned* psrc; if (!file || !(psrc = vector_at(v, file - 1))) return; TRACE("%s %lx %s %u\n", debugstr_w(module->module.ModuleName), address, source_get(module, *psrc), line); if (!(symt = symt_find_nearest(module, address)) || symt->symt.tag != SymTagFunction) return; func = (struct symt_function*)symt; symt_add_func_line(module, func, *psrc, line, address - func->address); } static BOOL dwarf2_parse_line_numbers(const dwarf2_section_t* sections, dwarf2_parse_context_t* ctx, const char* compile_dir, unsigned long offset) { dwarf2_traverse_context_t traverse; unsigned long length; unsigned version, header_len, insn_size, default_stmt; unsigned line_range, opcode_base; int line_base; const unsigned char* opcode_len; struct vector dirs; struct vector files; const char** p; /* section with line numbers stripped */ if (sections[section_line].address == IMAGE_NO_MAP) return FALSE; traverse.data = sections[section_line].address + offset; traverse.end_data = traverse.data + 4; traverse.word_size = ctx->module->format_info[DFI_DWARF]->u.dwarf2_info->word_size; length = dwarf2_parse_u4(&traverse); traverse.end_data = sections[section_line].address + offset + length; version = dwarf2_parse_u2(&traverse); header_len = dwarf2_parse_u4(&traverse); insn_size = dwarf2_parse_byte(&traverse); default_stmt = dwarf2_parse_byte(&traverse); line_base = (signed char)dwarf2_parse_byte(&traverse); line_range = dwarf2_parse_byte(&traverse); opcode_base = dwarf2_parse_byte(&traverse); opcode_len = traverse.data; traverse.data += opcode_base - 1; vector_init(&dirs, sizeof(const char*), 4); p = vector_add(&dirs, &ctx->pool); *p = compile_dir ? compile_dir : "."; while (*traverse.data) { const char* rel = (const char*)traverse.data; unsigned rellen = strlen(rel); TRACE("Got include %s\n", rel); traverse.data += rellen + 1; p = vector_add(&dirs, &ctx->pool); if (*rel == '/' || !compile_dir) *p = rel; else { /* include directory relative to compile directory */ unsigned baselen = strlen(compile_dir); char* tmp = pool_alloc(&ctx->pool, baselen + 1 + rellen + 1); strcpy(tmp, compile_dir); if (tmp[baselen - 1] != '/') tmp[baselen++] = '/'; strcpy(&tmp[baselen], rel); *p = tmp; } } traverse.data++; vector_init(&files, sizeof(unsigned), 16); while (*traverse.data) { unsigned int dir_index, mod_time, length; const char* name; const char* dir; unsigned* psrc; name = (const char*)traverse.data; traverse.data += strlen(name) + 1; dir_index = dwarf2_leb128_as_unsigned(&traverse); mod_time = dwarf2_leb128_as_unsigned(&traverse); length = dwarf2_leb128_as_unsigned(&traverse); dir = *(const char**)vector_at(&dirs, dir_index); TRACE("Got file %s/%s (%u,%u)\n", dir, name, mod_time, length); psrc = vector_add(&files, &ctx->pool); *psrc = source_new(ctx->module, dir, name); } traverse.data++; while (traverse.data < traverse.end_data) { unsigned long address = 0; unsigned file = 1; unsigned line = 1; unsigned is_stmt = default_stmt; BOOL end_sequence = FALSE; unsigned opcode, extopcode, i; while (!end_sequence) { opcode = dwarf2_parse_byte(&traverse); TRACE("Got opcode %x\n", opcode); if (opcode >= opcode_base) { unsigned delta = opcode - opcode_base; address += (delta / line_range) * insn_size; line += line_base + (delta % line_range); dwarf2_set_line_number(ctx->module, address, &files, file, line); } else { switch (opcode) { case DW_LNS_copy: dwarf2_set_line_number(ctx->module, address, &files, file, line); break; case DW_LNS_advance_pc: address += insn_size * dwarf2_leb128_as_unsigned(&traverse); break; case DW_LNS_advance_line: line += dwarf2_leb128_as_signed(&traverse); break; case DW_LNS_set_file: file = dwarf2_leb128_as_unsigned(&traverse); break; case DW_LNS_set_column: dwarf2_leb128_as_unsigned(&traverse); break; case DW_LNS_negate_stmt: is_stmt = !is_stmt; break; case DW_LNS_set_basic_block: break; case DW_LNS_const_add_pc: address += ((255 - opcode_base) / line_range) * insn_size; break; case DW_LNS_fixed_advance_pc: address += dwarf2_parse_u2(&traverse); break; case DW_LNS_extended_op: dwarf2_leb128_as_unsigned(&traverse); extopcode = dwarf2_parse_byte(&traverse); switch (extopcode) { case DW_LNE_end_sequence: dwarf2_set_line_number(ctx->module, address, &files, file, line); end_sequence = TRUE; break; case DW_LNE_set_address: address = ctx->load_offset + dwarf2_parse_addr(&traverse); break; case DW_LNE_define_file: FIXME("not handled %s\n", traverse.data); traverse.data += strlen((const char *)traverse.data) + 1; dwarf2_leb128_as_unsigned(&traverse); dwarf2_leb128_as_unsigned(&traverse); dwarf2_leb128_as_unsigned(&traverse); break; case DW_LNE_set_discriminator: WARN("not handled %s\n", traverse.data); dwarf2_leb128_as_unsigned(&traverse); break; default: FIXME("Unsupported extended opcode %x\n", extopcode); break; } break; default: WARN("Unsupported opcode %x\n", opcode); for (i = 0; i < opcode_len[opcode]; i++) dwarf2_leb128_as_unsigned(&traverse); break; } } } } return TRUE; } static BOOL dwarf2_parse_compilation_unit(const dwarf2_section_t* sections, struct module* module, const struct elf_thunk_area* thunks, dwarf2_traverse_context_t* mod_ctx, unsigned long load_offset) { dwarf2_parse_context_t ctx; dwarf2_traverse_context_t abbrev_ctx; dwarf2_debug_info_t* di; dwarf2_traverse_context_t cu_ctx; const unsigned char* comp_unit_start = mod_ctx->data; unsigned long cu_length; unsigned short cu_version; unsigned long cu_abbrev_offset; BOOL ret = FALSE; cu_length = dwarf2_parse_u4(mod_ctx); cu_ctx.data = mod_ctx->data; cu_ctx.end_data = mod_ctx->data + cu_length; mod_ctx->data += cu_length; cu_version = dwarf2_parse_u2(&cu_ctx); cu_abbrev_offset = dwarf2_parse_u4(&cu_ctx); cu_ctx.word_size = dwarf2_parse_byte(&cu_ctx); TRACE("Compilation Unit Header found at 0x%x:\n", (int)(comp_unit_start - sections[section_debug].address)); TRACE("- length: %lu\n", cu_length); TRACE("- version: %u\n", cu_version); TRACE("- abbrev_offset: %lu\n", cu_abbrev_offset); TRACE("- word_size: %u\n", cu_ctx.word_size); if (cu_version != 2) { WARN("%u DWARF version unsupported. Wine dbghelp only support DWARF 2.\n", cu_version); return FALSE; } module->format_info[DFI_DWARF]->u.dwarf2_info->word_size = cu_ctx.word_size; mod_ctx->word_size = cu_ctx.word_size; pool_init(&ctx.pool, 65536); ctx.sections = sections; ctx.section = section_debug; ctx.module = module; ctx.thunks = thunks; ctx.load_offset = load_offset; ctx.ref_offset = comp_unit_start - sections[section_debug].address; memset(ctx.symt_cache, 0, sizeof(ctx.symt_cache)); ctx.symt_cache[sc_void] = &symt_new_basic(module, btVoid, "void", 0)->symt; abbrev_ctx.data = sections[section_abbrev].address + cu_abbrev_offset; abbrev_ctx.end_data = sections[section_abbrev].address + sections[section_abbrev].size; abbrev_ctx.word_size = cu_ctx.word_size; dwarf2_parse_abbrev_set(&abbrev_ctx, &ctx.abbrev_table, &ctx.pool); sparse_array_init(&ctx.debug_info_table, sizeof(dwarf2_debug_info_t), 128); dwarf2_read_one_debug_info(&ctx, &cu_ctx, &di); if (di->abbrev->tag == DW_TAG_compile_unit) { struct attribute name; dwarf2_debug_info_t** pdi = NULL; struct attribute stmt_list, low_pc; struct attribute comp_dir; if (!dwarf2_find_attribute(&ctx, di, DW_AT_name, &name)) name.u.string = NULL; /* get working directory of current compilation unit */ if (!dwarf2_find_attribute(&ctx, di, DW_AT_comp_dir, &comp_dir)) comp_dir.u.string = NULL; if (!dwarf2_find_attribute(&ctx, di, DW_AT_low_pc, &low_pc)) low_pc.u.uvalue = 0; di->symt = &symt_new_compiland(module, ctx.load_offset + low_pc.u.uvalue, source_new(module, comp_dir.u.string, name.u.string))->symt; if (di->abbrev->have_child) { unsigned int i; for (i=0; ichildren); i++) { pdi = vector_at(&di->children, i); dwarf2_load_one_entry(&ctx, *pdi, (struct symt_compiland*)di->symt); } } if (dwarf2_find_attribute(&ctx, di, DW_AT_stmt_list, &stmt_list)) { if (dwarf2_parse_line_numbers(sections, &ctx, comp_dir.u.string, stmt_list.u.uvalue)) module->module.LineNumbers = TRUE; } ret = TRUE; } else FIXME("Should have a compilation unit here\n"); pool_destroy(&ctx.pool); return ret; } static BOOL dwarf2_lookup_loclist(const struct module_format* modfmt, const BYTE* start, unsigned long ip, dwarf2_traverse_context_t* lctx) { DWORD_PTR beg, end; const BYTE* ptr = start; DWORD len; while (ptr < modfmt->u.dwarf2_info->debug_loc.address + modfmt->u.dwarf2_info->debug_loc.size) { beg = dwarf2_get_addr(ptr, modfmt->u.dwarf2_info->word_size); ptr += modfmt->u.dwarf2_info->word_size; end = dwarf2_get_addr(ptr, modfmt->u.dwarf2_info->word_size); ptr += modfmt->u.dwarf2_info->word_size; if (!beg && !end) break; len = dwarf2_get_u2(ptr); ptr += 2; if (beg <= ip && ip < end) { lctx->data = ptr; lctx->end_data = ptr + len; lctx->word_size = modfmt->u.dwarf2_info->word_size; return TRUE; } ptr += len; } WARN("Couldn't find ip in location list\n"); return FALSE; } static enum location_error loc_compute_frame(struct process* pcs, const struct module_format* modfmt, const struct symt_function* func, DWORD_PTR ip, struct location* frame) { struct symt** psym = NULL; struct location* pframe; dwarf2_traverse_context_t lctx; enum location_error err; unsigned int i; for (i=0; ivchildren); i++) { psym = vector_at(&func->vchildren, i); if ((*psym)->tag == SymTagCustom) { pframe = &((struct symt_hierarchy_point*)*psym)->loc; /* First, recompute the frame information, if needed */ switch (pframe->kind) { case loc_regrel: case loc_register: *frame = *pframe; break; case loc_dwarf2_location_list: WARN("Searching loclist for %s\n", func->hash_elt.name); if (!dwarf2_lookup_loclist(modfmt, modfmt->u.dwarf2_info->debug_loc.address + pframe->offset, ip, &lctx)) return loc_err_out_of_scope; if ((err = compute_location(&lctx, frame, pcs->handle, NULL)) < 0) return err; if (frame->kind >= loc_user) { WARN("Couldn't compute runtime frame location\n"); return loc_err_too_complex; } break; default: WARN("Unsupported frame kind %d\n", pframe->kind); return loc_err_internal; } return 0; } } WARN("Couldn't find Custom function point, whilst location list offset is searched\n"); return loc_err_internal; } enum reg_rule { RULE_UNSET, /* not set at all */ RULE_UNDEFINED, /* undefined value */ RULE_SAME, /* same value as previous frame */ RULE_CFA_OFFSET, /* stored at cfa offset */ RULE_OTHER_REG, /* stored in other register */ RULE_EXPRESSION, /* address specified by expression */ RULE_VAL_EXPRESSION /* value specified by expression */ }; /* make it large enough for all CPUs */ #define NB_FRAME_REGS 64 #define MAX_SAVED_STATES 16 struct frame_state { ULONG_PTR cfa_offset; unsigned char cfa_reg; enum reg_rule cfa_rule; enum reg_rule rules[NB_FRAME_REGS]; ULONG_PTR regs[NB_FRAME_REGS]; }; struct frame_info { ULONG_PTR ip; ULONG_PTR code_align; LONG_PTR data_align; unsigned char retaddr_reg; unsigned char fde_encoding; unsigned char lsda_encoding; unsigned char signal_frame; unsigned char aug_z_format; unsigned char state_sp; struct frame_state state; struct frame_state state_stack[MAX_SAVED_STATES]; }; static ULONG_PTR dwarf2_parse_augmentation_ptr(dwarf2_traverse_context_t* ctx, unsigned char encoding) { ULONG_PTR base; if (encoding == DW_EH_PE_omit) return 0; switch (encoding & 0xf0) { case DW_EH_PE_abs: base = 0; break; case DW_EH_PE_pcrel: base = (ULONG_PTR)ctx->data; break; default: FIXME("unsupported encoding %02x\n", encoding); return 0; } switch (encoding & 0x0f) { case DW_EH_PE_native: return base + dwarf2_parse_addr(ctx); case DW_EH_PE_leb128: return base + dwarf2_leb128_as_unsigned(ctx); case DW_EH_PE_data2: return base + dwarf2_parse_u2(ctx); case DW_EH_PE_data4: return base + dwarf2_parse_u4(ctx); case DW_EH_PE_data8: return base + dwarf2_parse_u8(ctx); case DW_EH_PE_signed|DW_EH_PE_leb128: return base + dwarf2_leb128_as_signed(ctx); case DW_EH_PE_signed|DW_EH_PE_data2: return base + (signed short)dwarf2_parse_u2(ctx); case DW_EH_PE_signed|DW_EH_PE_data4: return base + (signed int)dwarf2_parse_u4(ctx); case DW_EH_PE_signed|DW_EH_PE_data8: return base + (LONG64)dwarf2_parse_u8(ctx); default: FIXME("unsupported encoding %02x\n", encoding); return 0; } } static BOOL parse_cie_details(dwarf2_traverse_context_t* ctx, struct frame_info* info) { unsigned char version; const char* augmentation; const unsigned char* end; ULONG_PTR len; memset(info, 0, sizeof(*info)); info->lsda_encoding = DW_EH_PE_omit; info->aug_z_format = 0; /* parse the CIE first */ version = dwarf2_parse_byte(ctx); if (version != 1) { FIXME("unknown CIE version %u at %p\n", version, ctx->data - 1); return FALSE; } augmentation = (const char*)ctx->data; ctx->data += strlen(augmentation) + 1; info->code_align = dwarf2_leb128_as_unsigned(ctx); info->data_align = dwarf2_leb128_as_signed(ctx); info->retaddr_reg = dwarf2_parse_byte(ctx); info->state.cfa_rule = RULE_CFA_OFFSET; end = NULL; TRACE("\tparsing augmentation %s\n", augmentation); if (*augmentation) do { switch (*augmentation) { case 'z': len = dwarf2_leb128_as_unsigned(ctx); end = ctx->data + len; info->aug_z_format = 1; continue; case 'L': info->lsda_encoding = dwarf2_parse_byte(ctx); continue; case 'P': { unsigned char encoding = dwarf2_parse_byte(ctx); /* throw away the indirect bit, as we don't care for the result */ encoding &= ~DW_EH_PE_indirect; dwarf2_parse_augmentation_ptr(ctx, encoding); /* handler */ continue; } case 'R': info->fde_encoding = dwarf2_parse_byte(ctx); continue; case 'S': info->signal_frame = 1; continue; } FIXME("unknown augmentation '%c'\n", *augmentation); if (!end) return FALSE; break; } while (*++augmentation); if (end) ctx->data = end; return TRUE; } static BOOL dwarf2_get_cie(unsigned long addr, struct module* module, DWORD_PTR delta, dwarf2_traverse_context_t* fde_ctx, dwarf2_traverse_context_t* cie_ctx, struct frame_info* info, BOOL in_eh_frame) { const unsigned char* ptr_blk; const unsigned char* cie_ptr; const unsigned char* last_cie_ptr = (const unsigned char*)~0; unsigned len, id; unsigned long start, range; unsigned cie_id; const BYTE* start_data = fde_ctx->data; cie_id = in_eh_frame ? 0 : DW_CIE_ID; for (; fde_ctx->data + 2 * 4 < fde_ctx->end_data; fde_ctx->data = ptr_blk) { /* find the FDE for address addr (skip CIE) */ len = dwarf2_parse_u4(fde_ctx); if (len == 0xffffffff) FIXME("Unsupported yet 64-bit CIEs\n"); ptr_blk = fde_ctx->data + len; id = dwarf2_parse_u4(fde_ctx); if (id == cie_id) { last_cie_ptr = fde_ctx->data - 8; /* we need some bits out of the CIE in order to parse all contents */ if (!parse_cie_details(fde_ctx, info)) return FALSE; cie_ctx->data = fde_ctx->data; cie_ctx->end_data = ptr_blk; cie_ctx->word_size = fde_ctx->word_size; continue; } cie_ptr = (in_eh_frame) ? fde_ctx->data - id - 4 : start_data + id; if (cie_ptr != last_cie_ptr) { last_cie_ptr = cie_ptr; cie_ctx->data = cie_ptr; cie_ctx->word_size = fde_ctx->word_size; cie_ctx->end_data = cie_ptr + 4; cie_ctx->end_data = cie_ptr + 4 + dwarf2_parse_u4(cie_ctx); if (dwarf2_parse_u4(cie_ctx) != cie_id) { FIXME("wrong CIE pointer\n"); return FALSE; } if (!parse_cie_details(cie_ctx, info)) return FALSE; } start = delta + dwarf2_parse_augmentation_ptr(fde_ctx, info->fde_encoding); range = dwarf2_parse_augmentation_ptr(fde_ctx, info->fde_encoding & 0x0F); if (addr >= start && addr < start + range) { /* reset the FDE context */ fde_ctx->end_data = ptr_blk; info->ip = start; return TRUE; } } return FALSE; } static int valid_reg(ULONG_PTR reg) { if (reg >= NB_FRAME_REGS) FIXME("unsupported reg %lx\n", reg); return (reg < NB_FRAME_REGS); } static void execute_cfa_instructions(dwarf2_traverse_context_t* ctx, ULONG_PTR last_ip, struct frame_info *info) { while (ctx->data < ctx->end_data && info->ip < last_ip + info->signal_frame) { enum dwarf_call_frame_info op = dwarf2_parse_byte(ctx); if (op & 0xc0) { switch (op & 0xc0) { case DW_CFA_advance_loc: { ULONG_PTR offset = (op & 0x3f) * info->code_align; TRACE("%lx: DW_CFA_advance_loc %lu\n", info->ip, offset); info->ip += offset; break; } case DW_CFA_offset: { ULONG_PTR reg = op & 0x3f; LONG_PTR offset = dwarf2_leb128_as_unsigned(ctx) * info->data_align; if (!valid_reg(reg)) break; TRACE("%lx: DW_CFA_offset %s, %ld\n", info->ip, dbghelp_current_cpu->fetch_regname(dbghelp_current_cpu->map_dwarf_register(reg)), offset); info->state.regs[reg] = offset; info->state.rules[reg] = RULE_CFA_OFFSET; break; } case DW_CFA_restore: { ULONG_PTR reg = op & 0x3f; if (!valid_reg(reg)) break; TRACE("%lx: DW_CFA_restore %s\n", info->ip, dbghelp_current_cpu->fetch_regname(dbghelp_current_cpu->map_dwarf_register(reg))); info->state.rules[reg] = RULE_UNSET; break; } } } else switch (op) { case DW_CFA_nop: break; case DW_CFA_set_loc: { ULONG_PTR loc = dwarf2_parse_augmentation_ptr(ctx, info->fde_encoding); TRACE("%lx: DW_CFA_set_loc %lx\n", info->ip, loc); info->ip = loc; break; } case DW_CFA_advance_loc1: { ULONG_PTR offset = dwarf2_parse_byte(ctx) * info->code_align; TRACE("%lx: DW_CFA_advance_loc1 %lu\n", info->ip, offset); info->ip += offset; break; } case DW_CFA_advance_loc2: { ULONG_PTR offset = dwarf2_parse_u2(ctx) * info->code_align; TRACE("%lx: DW_CFA_advance_loc2 %lu\n", info->ip, offset); info->ip += offset; break; } case DW_CFA_advance_loc4: { ULONG_PTR offset = dwarf2_parse_u4(ctx) * info->code_align; TRACE("%lx: DW_CFA_advance_loc4 %lu\n", info->ip, offset); info->ip += offset; break; } case DW_CFA_offset_extended: case DW_CFA_offset_extended_sf: { ULONG_PTR reg = dwarf2_leb128_as_unsigned(ctx); LONG_PTR offset = (op == DW_CFA_offset_extended) ? dwarf2_leb128_as_unsigned(ctx) * info->data_align : dwarf2_leb128_as_signed(ctx) * info->data_align; if (!valid_reg(reg)) break; TRACE("%lx: DW_CFA_offset_extended %s, %ld\n", info->ip, dbghelp_current_cpu->fetch_regname(dbghelp_current_cpu->map_dwarf_register(reg)), offset); info->state.regs[reg] = offset; info->state.rules[reg] = RULE_CFA_OFFSET; break; } case DW_CFA_restore_extended: { ULONG_PTR reg = dwarf2_leb128_as_unsigned(ctx); if (!valid_reg(reg)) break; TRACE("%lx: DW_CFA_restore_extended %s\n", info->ip, dbghelp_current_cpu->fetch_regname(dbghelp_current_cpu->map_dwarf_register(reg))); info->state.rules[reg] = RULE_UNSET; break; } case DW_CFA_undefined: { ULONG_PTR reg = dwarf2_leb128_as_unsigned(ctx); if (!valid_reg(reg)) break; TRACE("%lx: DW_CFA_undefined %s\n", info->ip, dbghelp_current_cpu->fetch_regname(dbghelp_current_cpu->map_dwarf_register(reg))); info->state.rules[reg] = RULE_UNDEFINED; break; } case DW_CFA_same_value: { ULONG_PTR reg = dwarf2_leb128_as_unsigned(ctx); if (!valid_reg(reg)) break; TRACE("%lx: DW_CFA_same_value %s\n", info->ip, dbghelp_current_cpu->fetch_regname(dbghelp_current_cpu->map_dwarf_register(reg))); info->state.regs[reg] = reg; info->state.rules[reg] = RULE_SAME; break; } case DW_CFA_register: { ULONG_PTR reg = dwarf2_leb128_as_unsigned(ctx); ULONG_PTR reg2 = dwarf2_leb128_as_unsigned(ctx); if (!valid_reg(reg) || !valid_reg(reg2)) break; TRACE("%lx: DW_CFA_register %s == %s\n", info->ip, dbghelp_current_cpu->fetch_regname(dbghelp_current_cpu->map_dwarf_register(reg)), dbghelp_current_cpu->fetch_regname(dbghelp_current_cpu->map_dwarf_register(reg2))); info->state.regs[reg] = reg2; info->state.rules[reg] = RULE_OTHER_REG; break; } case DW_CFA_remember_state: TRACE("%lx: DW_CFA_remember_state\n", info->ip); if (info->state_sp >= MAX_SAVED_STATES) FIXME("%lx: DW_CFA_remember_state too many nested saves\n", info->ip); else info->state_stack[info->state_sp++] = info->state; break; case DW_CFA_restore_state: TRACE("%lx: DW_CFA_restore_state\n", info->ip); if (!info->state_sp) FIXME("%lx: DW_CFA_restore_state without corresponding save\n", info->ip); else info->state = info->state_stack[--info->state_sp]; break; case DW_CFA_def_cfa: case DW_CFA_def_cfa_sf: { ULONG_PTR reg = dwarf2_leb128_as_unsigned(ctx); ULONG_PTR offset = (op == DW_CFA_def_cfa) ? dwarf2_leb128_as_unsigned(ctx) : dwarf2_leb128_as_signed(ctx) * info->data_align; if (!valid_reg(reg)) break; TRACE("%lx: DW_CFA_def_cfa %s, %lu\n", info->ip, dbghelp_current_cpu->fetch_regname(dbghelp_current_cpu->map_dwarf_register(reg)), offset); info->state.cfa_reg = reg; info->state.cfa_offset = offset; info->state.cfa_rule = RULE_CFA_OFFSET; break; } case DW_CFA_def_cfa_register: { ULONG_PTR reg = dwarf2_leb128_as_unsigned(ctx); if (!valid_reg(reg)) break; TRACE("%lx: DW_CFA_def_cfa_register %s\n", info->ip, dbghelp_current_cpu->fetch_regname(dbghelp_current_cpu->map_dwarf_register(reg))); info->state.cfa_reg = reg; info->state.cfa_rule = RULE_CFA_OFFSET; break; } case DW_CFA_def_cfa_offset: case DW_CFA_def_cfa_offset_sf: { ULONG_PTR offset = (op == DW_CFA_def_cfa_offset) ? dwarf2_leb128_as_unsigned(ctx) : dwarf2_leb128_as_signed(ctx) * info->data_align; TRACE("%lx: DW_CFA_def_cfa_offset %lu\n", info->ip, offset); info->state.cfa_offset = offset; info->state.cfa_rule = RULE_CFA_OFFSET; break; } case DW_CFA_def_cfa_expression: { ULONG_PTR expr = (ULONG_PTR)ctx->data; ULONG_PTR len = dwarf2_leb128_as_unsigned(ctx); TRACE("%lx: DW_CFA_def_cfa_expression %lx-%lx\n", info->ip, expr, expr+len); info->state.cfa_offset = expr; info->state.cfa_rule = RULE_VAL_EXPRESSION; ctx->data += len; break; } case DW_CFA_expression: case DW_CFA_val_expression: { ULONG_PTR reg = dwarf2_leb128_as_unsigned(ctx); ULONG_PTR expr = (ULONG_PTR)ctx->data; ULONG_PTR len = dwarf2_leb128_as_unsigned(ctx); if (!valid_reg(reg)) break; TRACE("%lx: DW_CFA_%sexpression %s %lx-%lx\n", info->ip, (op == DW_CFA_expression) ? "" : "val_", dbghelp_current_cpu->fetch_regname(dbghelp_current_cpu->map_dwarf_register(reg)), expr, expr + len); info->state.regs[reg] = expr; info->state.rules[reg] = (op == DW_CFA_expression) ? RULE_EXPRESSION : RULE_VAL_EXPRESSION; ctx->data += len; break; } case DW_CFA_GNU_args_size: /* FIXME: should check that GCC is the compiler for this CU */ { ULONG_PTR args = dwarf2_leb128_as_unsigned(ctx); TRACE("%lx: DW_CFA_GNU_args_size %lu\n", info->ip, args); /* ignored */ break; } default: FIXME("%lx: unknown CFA opcode %02x\n", info->ip, op); break; } } } /* retrieve a context register from its dwarf number */ static ULONG_PTR get_context_reg(CONTEXT *context, ULONG_PTR dw_reg) { unsigned regno = dbghelp_current_cpu->map_dwarf_register(dw_reg), sz; ULONG_PTR* ptr = dbghelp_current_cpu->fetch_context_reg(context, regno, &sz); if (sz != sizeof(ULONG_PTR)) { FIXME("reading register %lu/%u of wrong size %u\n", dw_reg, regno, sz); return 0; } return *ptr; } /* set a context register from its dwarf number */ static void set_context_reg(struct cpu_stack_walk* csw, CONTEXT *context, ULONG_PTR dw_reg, ULONG_PTR val, BOOL isdebuggee) { unsigned regno = dbghelp_current_cpu->map_dwarf_register(dw_reg), sz; ULONG_PTR* ptr = dbghelp_current_cpu->fetch_context_reg(context, regno, &sz); if (isdebuggee) { char tmp[16]; if (sz > sizeof(tmp)) { FIXME("register %lu/%u size is too wide: %u\n", dw_reg, regno, sz); return; } if (!sw_read_mem(csw, val, tmp, sz)) { WARN("Couldn't read memory at %p\n", (void*)val); return; } memcpy(ptr, tmp, sz); } else { if (sz != sizeof(ULONG_PTR)) { FIXME("assigning to register %lu/%u of wrong size %u\n", dw_reg, regno, sz); return; } *ptr = val; } } /* copy a register from one context to another using dwarf number */ static void copy_context_reg(CONTEXT *dstcontext, ULONG_PTR dwregdst, CONTEXT* srccontext, ULONG_PTR dwregsrc) { unsigned regdstno = dbghelp_current_cpu->map_dwarf_register(dwregdst), szdst; unsigned regsrcno = dbghelp_current_cpu->map_dwarf_register(dwregsrc), szsrc; ULONG_PTR* ptrdst = dbghelp_current_cpu->fetch_context_reg(dstcontext, regdstno, &szdst); ULONG_PTR* ptrsrc = dbghelp_current_cpu->fetch_context_reg(srccontext, regsrcno, &szsrc); if (szdst != szsrc) { FIXME("Cannot copy register %lu/%u => %lu/%u because of size mismatch (%u => %u)\n", dwregsrc, regsrcno, dwregdst, regdstno, szsrc, szdst); return; } memcpy(ptrdst, ptrsrc, szdst); } static ULONG_PTR eval_expression(const struct module* module, struct cpu_stack_walk* csw, const unsigned char* zp, CONTEXT *context) { dwarf2_traverse_context_t ctx; ULONG_PTR reg, sz, tmp, stack[64]; int sp = -1; ULONG_PTR len; ctx.data = zp; ctx.end_data = zp + 4; len = dwarf2_leb128_as_unsigned(&ctx); ctx.end_data = ctx.data + len; ctx.word_size = module->format_info[DFI_DWARF]->u.dwarf2_info->word_size; while (ctx.data < ctx.end_data) { unsigned char opcode = dwarf2_parse_byte(&ctx); if (opcode >= DW_OP_lit0 && opcode <= DW_OP_lit31) stack[++sp] = opcode - DW_OP_lit0; else if (opcode >= DW_OP_reg0 && opcode <= DW_OP_reg31) stack[++sp] = get_context_reg(context, opcode - DW_OP_reg0); else if (opcode >= DW_OP_breg0 && opcode <= DW_OP_breg31) stack[++sp] = get_context_reg(context, opcode - DW_OP_breg0) + dwarf2_leb128_as_signed(&ctx); else switch (opcode) { case DW_OP_nop: break; case DW_OP_addr: stack[++sp] = dwarf2_parse_addr(&ctx); break; case DW_OP_const1u: stack[++sp] = dwarf2_parse_byte(&ctx); break; case DW_OP_const1s: stack[++sp] = (signed char)dwarf2_parse_byte(&ctx); break; case DW_OP_const2u: stack[++sp] = dwarf2_parse_u2(&ctx); break; case DW_OP_const2s: stack[++sp] = (short)dwarf2_parse_u2(&ctx); break; case DW_OP_const4u: stack[++sp] = dwarf2_parse_u4(&ctx); break; case DW_OP_const4s: stack[++sp] = (signed int)dwarf2_parse_u4(&ctx); break; case DW_OP_const8u: stack[++sp] = dwarf2_parse_u8(&ctx); break; case DW_OP_const8s: stack[++sp] = (LONG_PTR)dwarf2_parse_u8(&ctx); break; case DW_OP_constu: stack[++sp] = dwarf2_leb128_as_unsigned(&ctx); break; case DW_OP_consts: stack[++sp] = dwarf2_leb128_as_signed(&ctx); break; case DW_OP_deref: if (!sw_read_mem(csw, stack[sp], &tmp, sizeof(tmp))) { ERR("Couldn't read memory at %lx\n", stack[sp]); tmp = 0; } stack[sp] = tmp; break; case DW_OP_dup: stack[sp + 1] = stack[sp]; sp++; break; case DW_OP_drop: sp--; break; case DW_OP_over: stack[sp + 1] = stack[sp - 1]; sp++; break; case DW_OP_pick: stack[sp + 1] = stack[sp - dwarf2_parse_byte(&ctx)]; sp++; break; case DW_OP_swap: tmp = stack[sp]; stack[sp] = stack[sp-1]; stack[sp-1] = tmp; break; case DW_OP_rot: tmp = stack[sp]; stack[sp] = stack[sp-1]; stack[sp-1] = stack[sp-2]; stack[sp-2] = tmp; break; case DW_OP_abs: stack[sp] = labs(stack[sp]); break; case DW_OP_neg: stack[sp] = -stack[sp]; break; case DW_OP_not: stack[sp] = ~stack[sp]; break; case DW_OP_and: stack[sp-1] &= stack[sp]; sp--; break; case DW_OP_or: stack[sp-1] |= stack[sp]; sp--; break; case DW_OP_minus: stack[sp-1] -= stack[sp]; sp--; break; case DW_OP_mul: stack[sp-1] *= stack[sp]; sp--; break; case DW_OP_plus: stack[sp-1] += stack[sp]; sp--; break; case DW_OP_xor: stack[sp-1] ^= stack[sp]; sp--; break; case DW_OP_shl: stack[sp-1] <<= stack[sp]; sp--; break; case DW_OP_shr: stack[sp-1] >>= stack[sp]; sp--; break; case DW_OP_plus_uconst: stack[sp] += dwarf2_leb128_as_unsigned(&ctx); break; case DW_OP_shra: stack[sp-1] = (LONG_PTR)stack[sp-1] / (1 << stack[sp]); sp--; break; case DW_OP_div: stack[sp-1] = (LONG_PTR)stack[sp-1] / (LONG_PTR)stack[sp]; sp--; break; case DW_OP_mod: stack[sp-1] = (LONG_PTR)stack[sp-1] % (LONG_PTR)stack[sp]; sp--; break; case DW_OP_ge: stack[sp-1] = ((LONG_PTR)stack[sp-1] >= (LONG_PTR)stack[sp]); sp--; break; case DW_OP_gt: stack[sp-1] = ((LONG_PTR)stack[sp-1] > (LONG_PTR)stack[sp]); sp--; break; case DW_OP_le: stack[sp-1] = ((LONG_PTR)stack[sp-1] <= (LONG_PTR)stack[sp]); sp--; break; case DW_OP_lt: stack[sp-1] = ((LONG_PTR)stack[sp-1] < (LONG_PTR)stack[sp]); sp--; break; case DW_OP_eq: stack[sp-1] = (stack[sp-1] == stack[sp]); sp--; break; case DW_OP_ne: stack[sp-1] = (stack[sp-1] != stack[sp]); sp--; break; case DW_OP_skip: tmp = (short)dwarf2_parse_u2(&ctx); ctx.data += tmp; break; case DW_OP_bra: tmp = (short)dwarf2_parse_u2(&ctx); if (!stack[sp--]) ctx.data += tmp; break; case DW_OP_GNU_encoded_addr: tmp = dwarf2_parse_byte(&ctx); stack[++sp] = dwarf2_parse_augmentation_ptr(&ctx, tmp); break; case DW_OP_regx: stack[++sp] = get_context_reg(context, dwarf2_leb128_as_unsigned(&ctx)); break; case DW_OP_bregx: reg = dwarf2_leb128_as_unsigned(&ctx); tmp = dwarf2_leb128_as_signed(&ctx); stack[++sp] = get_context_reg(context, reg) + tmp; break; case DW_OP_deref_size: sz = dwarf2_parse_byte(&ctx); if (!sw_read_mem(csw, stack[sp], &tmp, sz)) { ERR("Couldn't read memory at %lx\n", stack[sp]); tmp = 0; } /* do integral promotion */ switch (sz) { case 1: stack[sp] = *(unsigned char*)&tmp; break; case 2: stack[sp] = *(unsigned short*)&tmp; break; case 4: stack[sp] = *(unsigned int*)&tmp; break; case 8: stack[sp] = *(ULONG_PTR*)&tmp; break; /* FIXME: won't work on 32bit platform */ default: FIXME("Unknown size for deref 0x%lx\n", sz); } break; default: FIXME("unhandled opcode %02x\n", opcode); } } return stack[sp]; } static void apply_frame_state(const struct module* module, struct cpu_stack_walk* csw, CONTEXT *context, struct frame_state *state, ULONG_PTR* cfa) { unsigned int i; ULONG_PTR value; CONTEXT new_context = *context; switch (state->cfa_rule) { case RULE_EXPRESSION: *cfa = eval_expression(module, csw, (const unsigned char*)state->cfa_offset, context); if (!sw_read_mem(csw, *cfa, cfa, sizeof(*cfa))) { WARN("Couldn't read memory at %p\n", (void*)*cfa); return; } break; case RULE_VAL_EXPRESSION: *cfa = eval_expression(module, csw, (const unsigned char*)state->cfa_offset, context); break; default: *cfa = get_context_reg(context, state->cfa_reg) + state->cfa_offset; break; } if (!*cfa) return; for (i = 0; i < NB_FRAME_REGS; i++) { switch (state->rules[i]) { case RULE_UNSET: case RULE_UNDEFINED: case RULE_SAME: break; case RULE_CFA_OFFSET: set_context_reg(csw, &new_context, i, *cfa + state->regs[i], TRUE); break; case RULE_OTHER_REG: copy_context_reg(&new_context, i, context, state->regs[i]); break; case RULE_EXPRESSION: value = eval_expression(module, csw, (const unsigned char*)state->regs[i], context); set_context_reg(csw, &new_context, i, value, TRUE); break; case RULE_VAL_EXPRESSION: value = eval_expression(module, csw, (const unsigned char*)state->regs[i], context); set_context_reg(csw, &new_context, i, value, FALSE); break; } } *context = new_context; } /*********************************************************************** * dwarf2_virtual_unwind * */ BOOL dwarf2_virtual_unwind(struct cpu_stack_walk* csw, ULONG_PTR ip, CONTEXT* context, ULONG_PTR* cfa) { struct module_pair pair; struct frame_info info; dwarf2_traverse_context_t cie_ctx, fde_ctx; struct module_format* modfmt; const unsigned char* end; DWORD_PTR delta; if (!(pair.pcs = process_find_by_handle(csw->hProcess)) || !(pair.requested = module_find_by_addr(pair.pcs, ip, DMT_UNKNOWN)) || !module_get_debug(&pair)) return FALSE; modfmt = pair.effective->format_info[DFI_DWARF]; if (!modfmt) return FALSE; memset(&info, 0, sizeof(info)); fde_ctx.data = modfmt->u.dwarf2_info->eh_frame.address; fde_ctx.end_data = fde_ctx.data + modfmt->u.dwarf2_info->eh_frame.size; fde_ctx.word_size = modfmt->u.dwarf2_info->word_size; /* let offsets relative to the eh_frame sections be correctly computed, as we'll map * in this process the IMAGE section at a different address as the one expected by * the image */ delta = pair.effective->module.BaseOfImage + modfmt->u.dwarf2_info->eh_frame.rva - (DWORD_PTR)modfmt->u.dwarf2_info->eh_frame.address; if (!dwarf2_get_cie(ip, pair.effective, delta, &fde_ctx, &cie_ctx, &info, TRUE)) { fde_ctx.data = modfmt->u.dwarf2_info->debug_frame.address; fde_ctx.end_data = fde_ctx.data + modfmt->u.dwarf2_info->debug_frame.size; fde_ctx.word_size = modfmt->u.dwarf2_info->word_size; delta = pair.effective->reloc_delta; if (!dwarf2_get_cie(ip, pair.effective, delta, &fde_ctx, &cie_ctx, &info, FALSE)) { TRACE("Couldn't find information for %lx\n", ip); return FALSE; } } TRACE("function %lx/%lx code_align %lu data_align %ld retaddr %s\n", ip, info.ip, info.code_align, info.data_align, dbghelp_current_cpu->fetch_regname(dbghelp_current_cpu->map_dwarf_register(info.retaddr_reg))); /* if at very beginning of function, return and use default unwinder */ if (ip == info.ip) return FALSE; execute_cfa_instructions(&cie_ctx, ip, &info); if (info.aug_z_format) /* get length of augmentation data */ { ULONG_PTR len = dwarf2_leb128_as_unsigned(&fde_ctx); end = fde_ctx.data + len; } else end = NULL; dwarf2_parse_augmentation_ptr(&fde_ctx, info.lsda_encoding); /* handler_data */ if (end) fde_ctx.data = end; execute_cfa_instructions(&fde_ctx, ip, &info); apply_frame_state(pair.effective, csw, context, &info.state, cfa); return TRUE; } static void dwarf2_location_compute(struct process* pcs, const struct module_format* modfmt, const struct symt_function* func, struct location* loc) { struct location frame; DWORD_PTR ip; int err; dwarf2_traverse_context_t lctx; if (!func->container || func->container->tag != SymTagCompiland) { WARN("We'd expect function %s's container to exist and be a compiland\n", func->hash_elt.name); err = loc_err_internal; } else { /* instruction pointer relative to compiland's start */ ip = pcs->ctx_frame.InstructionOffset - ((struct symt_compiland*)func->container)->address; if ((err = loc_compute_frame(pcs, modfmt, func, ip, &frame)) == 0) { switch (loc->kind) { case loc_dwarf2_location_list: /* Then, if the variable has a location list, find it !! */ if (dwarf2_lookup_loclist(modfmt, modfmt->u.dwarf2_info->debug_loc.address + loc->offset, ip, &lctx)) goto do_compute; err = loc_err_out_of_scope; break; case loc_dwarf2_block: /* or if we have a copy of an existing block, get ready for it */ { unsigned* ptr = (unsigned*)loc->offset; lctx.data = (const BYTE*)(ptr + 1); lctx.end_data = lctx.data + *ptr; lctx.word_size = modfmt->u.dwarf2_info->word_size; } do_compute: /* now get the variable */ err = compute_location(&lctx, loc, pcs->handle, &frame); break; case loc_register: case loc_regrel: /* nothing to do */ break; default: WARN("Unsupported local kind %d\n", loc->kind); err = loc_err_internal; } } } if (err < 0) { loc->kind = loc_register; loc->reg = err; } } static void dwarf2_module_remove(struct process* pcs, struct module_format* modfmt) { HeapFree(GetProcessHeap(), 0, modfmt); } static inline BOOL dwarf2_init_section(dwarf2_section_t* section, struct image_file_map* fmap, const char* sectname, struct image_section_map* ism) { struct image_section_map local_ism; if (!ism) ism = &local_ism; if (!image_find_section(fmap, sectname, ism)) { section->address = NULL; section->size = 0; section->rva = 0; return FALSE; } section->address = (const BYTE*)image_map_section(ism); section->size = image_get_map_size(ism); section->rva = image_get_map_rva(ism); return TRUE; } BOOL dwarf2_parse(struct module* module, unsigned long load_offset, const struct elf_thunk_area* thunks, struct image_file_map* fmap) { dwarf2_section_t section[section_max]; dwarf2_traverse_context_t mod_ctx; struct image_section_map debug_sect, debug_str_sect, debug_abbrev_sect, debug_line_sect; BOOL ret = TRUE; struct module_format* dwarf2_modfmt; if (!dwarf2_init_section(§ion[section_debug], fmap, ".debug_info", &debug_sect)) /* no Dwarf debug info here */ return FALSE; dwarf2_init_section(§ion[section_abbrev], fmap, ".debug_abbrev", &debug_abbrev_sect); dwarf2_init_section(§ion[section_string], fmap, ".debug_str", &debug_str_sect); dwarf2_init_section(§ion[section_line], fmap, ".debug_line", &debug_line_sect); if (section[section_debug].address == IMAGE_NO_MAP || section[section_abbrev].address == IMAGE_NO_MAP || section[section_string].address == IMAGE_NO_MAP) { ret = FALSE; goto leave; } if (fmap->modtype == DMT_ELF) { /* debug info might have a different base address than .so file * when elf file is prelinked after splitting off debug info * adjust symbol base addresses accordingly */ load_offset += fmap->u.elf.elf_start - debug_sect.fmap->u.elf.elf_start; } TRACE("Loading Dwarf2 information for %s\n", debugstr_w(module->module.ModuleName)); mod_ctx.data = section[section_debug].address; mod_ctx.end_data = mod_ctx.data + section[section_debug].size; mod_ctx.word_size = 0; /* will be correctly set later on */ dwarf2_modfmt = HeapAlloc(GetProcessHeap(), 0, sizeof(*dwarf2_modfmt) + sizeof(*dwarf2_modfmt->u.dwarf2_info)); if (!dwarf2_modfmt) { ret = FALSE; goto leave; } dwarf2_modfmt->module = module; dwarf2_modfmt->remove = dwarf2_module_remove; dwarf2_modfmt->loc_compute = dwarf2_location_compute; dwarf2_modfmt->u.dwarf2_info = (struct dwarf2_module_info_s*)(dwarf2_modfmt + 1); dwarf2_modfmt->u.dwarf2_info->word_size = 0; /* will be correctly set later on */ dwarf2_modfmt->module->format_info[DFI_DWARF] = dwarf2_modfmt; /* As we'll need later some sections' content, we won't unmap these * sections upon existing this function */ dwarf2_init_section(&dwarf2_modfmt->u.dwarf2_info->debug_loc, fmap, ".debug_loc", NULL); dwarf2_init_section(&dwarf2_modfmt->u.dwarf2_info->debug_frame, fmap, ".debug_frame", NULL); dwarf2_init_section(&dwarf2_modfmt->u.dwarf2_info->eh_frame, fmap, ".eh_frame", NULL); while (mod_ctx.data < mod_ctx.end_data) { dwarf2_parse_compilation_unit(section, dwarf2_modfmt->module, thunks, &mod_ctx, load_offset); } dwarf2_modfmt->module->module.SymType = SymDia; dwarf2_modfmt->module->module.CVSig = 'D' | ('W' << 8) | ('A' << 16) | ('R' << 24); /* FIXME: we could have a finer grain here */ dwarf2_modfmt->module->module.GlobalSymbols = TRUE; dwarf2_modfmt->module->module.TypeInfo = TRUE; dwarf2_modfmt->module->module.SourceIndexed = TRUE; dwarf2_modfmt->module->module.Publics = TRUE; leave: image_unmap_section(&debug_sect); image_unmap_section(&debug_abbrev_sect); image_unmap_section(&debug_str_sect); image_unmap_section(&debug_line_sect); return ret; }