| /* |
| * DWARF2 debugging format |
| * |
| * Copyright (C) 2006-2007 Peter Johnson |
| * |
| * 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 OTHER 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 OTHER 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 <util.h> |
| /*@unused@*/ RCSID("$Id: dwarf2-dbgfmt.c,v 1.1.1.1 2012/03/29 17:21:01 uid42307 Exp $"); |
| |
| #include <libyasm.h> |
| |
| #include "dwarf2-dbgfmt.h" |
| |
| struct dwarf2_head { |
| yasm_bytecode *start_prevbc; |
| yasm_bytecode *end_prevbc; |
| /*@null@*/ yasm_section *debug_ptr; |
| int with_address; |
| int with_segment; |
| }; |
| |
| /* Bytecode callback function prototypes */ |
| static void dwarf2_head_bc_destroy(void *contents); |
| static void dwarf2_head_bc_print(const void *contents, FILE *f, |
| int indent_level); |
| static int dwarf2_head_bc_calc_len |
| (yasm_bytecode *bc, yasm_bc_add_span_func add_span, void *add_span_data); |
| static int dwarf2_head_bc_tobytes |
| (yasm_bytecode *bc, unsigned char **bufp, void *d, |
| yasm_output_value_func output_value, |
| /*@null@*/ yasm_output_reloc_func output_reloc); |
| |
| /* Bytecode callback structures */ |
| static const yasm_bytecode_callback dwarf2_head_bc_callback = { |
| dwarf2_head_bc_destroy, |
| dwarf2_head_bc_print, |
| yasm_bc_finalize_common, |
| dwarf2_head_bc_calc_len, |
| yasm_bc_expand_common, |
| dwarf2_head_bc_tobytes, |
| 0 |
| }; |
| |
| /* Section data callback function prototypes */ |
| static void dwarf2_section_data_destroy(void *data); |
| static void dwarf2_section_data_print(void *data, FILE *f, int indent_level); |
| |
| /* Section data callback */ |
| const yasm_assoc_data_callback yasm_dwarf2__section_data_cb = { |
| dwarf2_section_data_destroy, |
| dwarf2_section_data_print |
| }; |
| |
| yasm_dbgfmt_module yasm_dwarf2_LTX_dbgfmt; |
| |
| |
| static /*@null@*/ /*@only@*/ yasm_dbgfmt * |
| dwarf2_dbgfmt_create(yasm_object *object) |
| { |
| yasm_dbgfmt_dwarf2 *dbgfmt_dwarf2 = |
| yasm_xmalloc(sizeof(yasm_dbgfmt_dwarf2)); |
| size_t i; |
| |
| dbgfmt_dwarf2->dbgfmt.module = &yasm_dwarf2_LTX_dbgfmt; |
| |
| dbgfmt_dwarf2->dirs_allocated = 32; |
| dbgfmt_dwarf2->dirs_size = 0; |
| dbgfmt_dwarf2->dirs = |
| yasm_xmalloc(sizeof(char *)*dbgfmt_dwarf2->dirs_allocated); |
| |
| dbgfmt_dwarf2->filenames_allocated = 32; |
| dbgfmt_dwarf2->filenames_size = 0; |
| dbgfmt_dwarf2->filenames = |
| yasm_xmalloc(sizeof(dwarf2_filename)*dbgfmt_dwarf2->filenames_allocated); |
| for (i=0; i<dbgfmt_dwarf2->filenames_allocated; i++) { |
| dbgfmt_dwarf2->filenames[i].pathname = NULL; |
| dbgfmt_dwarf2->filenames[i].filename = NULL; |
| dbgfmt_dwarf2->filenames[i].dir = 0; |
| } |
| |
| dbgfmt_dwarf2->format = DWARF2_FORMAT_32BIT; /* TODO: flexible? */ |
| |
| dbgfmt_dwarf2->sizeof_address = yasm_arch_get_address_size(object->arch)/8; |
| switch (dbgfmt_dwarf2->format) { |
| case DWARF2_FORMAT_32BIT: |
| dbgfmt_dwarf2->sizeof_offset = 4; |
| break; |
| case DWARF2_FORMAT_64BIT: |
| dbgfmt_dwarf2->sizeof_offset = 8; |
| break; |
| } |
| dbgfmt_dwarf2->min_insn_len = yasm_arch_min_insn_len(object->arch); |
| |
| return (yasm_dbgfmt *)dbgfmt_dwarf2; |
| } |
| |
| static void |
| dwarf2_dbgfmt_destroy(/*@only@*/ yasm_dbgfmt *dbgfmt) |
| { |
| yasm_dbgfmt_dwarf2 *dbgfmt_dwarf2 = (yasm_dbgfmt_dwarf2 *)dbgfmt; |
| size_t i; |
| for (i=0; i<dbgfmt_dwarf2->dirs_size; i++) |
| if (dbgfmt_dwarf2->dirs[i]) |
| yasm_xfree(dbgfmt_dwarf2->dirs[i]); |
| yasm_xfree(dbgfmt_dwarf2->dirs); |
| for (i=0; i<dbgfmt_dwarf2->filenames_size; i++) { |
| if (dbgfmt_dwarf2->filenames[i].pathname) |
| yasm_xfree(dbgfmt_dwarf2->filenames[i].pathname); |
| if (dbgfmt_dwarf2->filenames[i].filename) |
| yasm_xfree(dbgfmt_dwarf2->filenames[i].filename); |
| } |
| yasm_xfree(dbgfmt_dwarf2->filenames); |
| yasm_xfree(dbgfmt); |
| } |
| |
| /* Add a bytecode to a section, updating offset on insertion; |
| * no optimization necessary. |
| */ |
| yasm_bytecode * |
| yasm_dwarf2__append_bc(yasm_section *sect, yasm_bytecode *bc) |
| { |
| yasm_bytecode *precbc = yasm_section_bcs_last(sect); |
| bc->offset = yasm_bc_next_offset(precbc); |
| yasm_section_bcs_append(sect, bc); |
| return precbc; |
| } |
| |
| static void |
| dwarf2_dbgfmt_generate(yasm_object *object, yasm_linemap *linemap, |
| yasm_errwarns *errwarns) |
| { |
| yasm_dbgfmt_dwarf2 *dbgfmt_dwarf2 = (yasm_dbgfmt_dwarf2 *)object->dbgfmt; |
| size_t num_line_sections; |
| /*@null@*/ yasm_section *debug_info, *debug_line, *main_code; |
| |
| /* If we don't have any .file directives, generate line information |
| * based on the asm source. |
| */ |
| debug_line = yasm_dwarf2__generate_line(object, linemap, errwarns, |
| dbgfmt_dwarf2->filenames_size == 0, |
| &main_code, &num_line_sections); |
| |
| /* If we don't have a .debug_info (or it's empty), generate the minimal |
| * set of .debug_info, .debug_aranges, and .debug_abbrev so that the |
| * .debug_line we're generating is actually useful. |
| */ |
| debug_info = yasm_object_find_general(object, ".debug_info"); |
| if (num_line_sections > 0 && |
| (!debug_info || yasm_section_bcs_first(debug_info) |
| == yasm_section_bcs_last(debug_info))) { |
| debug_info = yasm_dwarf2__generate_info(object, debug_line, main_code); |
| yasm_dwarf2__generate_aranges(object, debug_info); |
| /*yasm_dwarf2__generate_pubnames(object, debug_info);*/ |
| } |
| } |
| |
| yasm_symrec * |
| yasm_dwarf2__bc_sym(yasm_symtab *symtab, yasm_bytecode *bc) |
| { |
| /*@dependent@*/ yasm_symrec *sym; |
| if (bc->symrecs && bc->symrecs[0]) |
| sym = bc->symrecs[0]; |
| else |
| sym = yasm_symtab_define_label(symtab, ".bcsym", bc, 0, 0); |
| return sym; |
| } |
| |
| dwarf2_head * |
| yasm_dwarf2__add_head |
| (yasm_dbgfmt_dwarf2 *dbgfmt_dwarf2, yasm_section *sect, |
| /*@null@*/ yasm_section *debug_ptr, int with_address, int with_segment) |
| { |
| dwarf2_head *head; |
| yasm_bytecode *bc; |
| |
| head = yasm_xmalloc(sizeof(dwarf2_head)); |
| head->start_prevbc = yasm_section_bcs_last(sect); |
| |
| bc = yasm_bc_create_common(&dwarf2_head_bc_callback, head, 0); |
| bc->len = dbgfmt_dwarf2->sizeof_offset + 2; |
| if (dbgfmt_dwarf2->format == DWARF2_FORMAT_64BIT) |
| bc->len += 4; |
| |
| if (debug_ptr) { |
| head->debug_ptr = debug_ptr; |
| bc->len += dbgfmt_dwarf2->sizeof_offset; |
| } else |
| head->debug_ptr = NULL; |
| |
| head->with_address = with_address; |
| head->with_segment = with_segment; |
| if (with_address) |
| bc->len++; |
| if (with_segment) |
| bc->len++; |
| |
| head->end_prevbc = bc; |
| yasm_dwarf2__append_bc(sect, bc); |
| return head; |
| } |
| |
| void |
| yasm_dwarf2__set_head_end(dwarf2_head *head, yasm_bytecode *end_prevbc) |
| { |
| head->end_prevbc = end_prevbc; |
| } |
| |
| static void |
| dwarf2_head_bc_destroy(void *contents) |
| { |
| yasm_xfree(contents); |
| } |
| |
| static void |
| dwarf2_head_bc_print(const void *contents, FILE *f, int indent_level) |
| { |
| /* TODO */ |
| } |
| |
| static int |
| dwarf2_head_bc_calc_len(yasm_bytecode *bc, yasm_bc_add_span_func add_span, |
| void *add_span_data) |
| { |
| yasm_internal_error(N_("tried to calc_len a dwarf2 head bytecode")); |
| /*@notreached@*/ |
| return 0; |
| } |
| |
| static int |
| dwarf2_head_bc_tobytes(yasm_bytecode *bc, unsigned char **bufp, void *d, |
| yasm_output_value_func output_value, |
| yasm_output_reloc_func output_reloc) |
| { |
| yasm_object *object = yasm_section_get_object(bc->section); |
| yasm_dbgfmt_dwarf2 *dbgfmt_dwarf2 = (yasm_dbgfmt_dwarf2 *)object->dbgfmt; |
| dwarf2_head *head = (dwarf2_head *)bc->contents; |
| unsigned char *buf = *bufp; |
| yasm_intnum *intn, *cval; |
| |
| if (dbgfmt_dwarf2->format == DWARF2_FORMAT_64BIT) { |
| YASM_WRITE_8(buf, 0xff); |
| YASM_WRITE_8(buf, 0xff); |
| YASM_WRITE_8(buf, 0xff); |
| YASM_WRITE_8(buf, 0xff); |
| } |
| |
| /* Total length of aranges info (following this field) */ |
| cval = yasm_intnum_create_uint(dbgfmt_dwarf2->sizeof_offset); |
| intn = yasm_calc_bc_dist(head->start_prevbc, head->end_prevbc); |
| yasm_intnum_calc(intn, YASM_EXPR_SUB, cval); |
| yasm_arch_intnum_tobytes(object->arch, intn, buf, |
| dbgfmt_dwarf2->sizeof_offset, |
| dbgfmt_dwarf2->sizeof_offset*8, 0, bc, 0); |
| buf += dbgfmt_dwarf2->sizeof_offset; |
| yasm_intnum_destroy(intn); |
| |
| /* DWARF version */ |
| yasm_intnum_set_uint(cval, 2); |
| yasm_arch_intnum_tobytes(object->arch, cval, buf, 2, 16, 0, bc, 0); |
| buf += 2; |
| |
| /* Pointer to another debug section */ |
| if (head->debug_ptr) { |
| yasm_value value; |
| yasm_value_init_sym(&value, |
| yasm_dwarf2__bc_sym(object->symtab, |
| yasm_section_bcs_first(head->debug_ptr)), |
| dbgfmt_dwarf2->sizeof_offset*8); |
| output_value(&value, buf, dbgfmt_dwarf2->sizeof_offset, |
| (unsigned long)(buf-*bufp), bc, 0, d); |
| buf += dbgfmt_dwarf2->sizeof_offset; |
| } |
| |
| /* Size of the offset portion of the address */ |
| if (head->with_address) |
| YASM_WRITE_8(buf, dbgfmt_dwarf2->sizeof_address); |
| |
| /* Size of a segment descriptor. 0 = flat address space */ |
| if (head->with_segment) |
| YASM_WRITE_8(buf, 0); |
| |
| *bufp = buf; |
| |
| yasm_intnum_destroy(cval); |
| return 0; |
| } |
| |
| static void |
| dwarf2_section_data_destroy(void *data) |
| { |
| dwarf2_section_data *dsd = data; |
| dwarf2_loc *n1, *n2; |
| |
| /* Delete locations */ |
| n1 = STAILQ_FIRST(&dsd->locs); |
| while (n1) { |
| n2 = STAILQ_NEXT(n1, link); |
| yasm_xfree(n1); |
| n1 = n2; |
| } |
| |
| yasm_xfree(data); |
| } |
| |
| static void |
| dwarf2_section_data_print(void *data, FILE *f, int indent_level) |
| { |
| /* TODO */ |
| } |
| |
| static const yasm_directive dwarf2_directives[] = { |
| { ".loc", "gas", yasm_dwarf2__dir_loc, YASM_DIR_ARG_REQUIRED }, |
| { ".file", "gas", yasm_dwarf2__dir_file, YASM_DIR_ARG_REQUIRED }, |
| { "loc", "nasm", yasm_dwarf2__dir_loc, YASM_DIR_ARG_REQUIRED }, |
| { "file", "nasm", yasm_dwarf2__dir_file, YASM_DIR_ARG_REQUIRED }, |
| { NULL, NULL, NULL, 0 } |
| }; |
| |
| /* Define dbgfmt structure -- see dbgfmt.h for details */ |
| yasm_dbgfmt_module yasm_dwarf2_LTX_dbgfmt = { |
| "DWARF2 debugging format", |
| "dwarf2", |
| dwarf2_directives, |
| dwarf2_dbgfmt_create, |
| dwarf2_dbgfmt_destroy, |
| dwarf2_dbgfmt_generate |
| }; |
