From 438ab76e13b03285fb673601c0beb63b79f7afe2 Mon Sep 17 00:00:00 2001
From: Jason Hiser <jdh8d@virginia.edu>
Date: Mon, 1 Oct 2018 09:55:40 -0400
Subject: [PATCH] eh support to put the printable version of dwarf instructions
in ehframe.s for debugability
---
include/ehwrite.h | 1 +
include/zipr_dwarf2.hpp | 584 ++++++++++++++++++++++++++++++++++++++++
src/ehwrite.cpp | 324 +++++++++++++++++++++-
3 files changed, 895 insertions(+), 14 deletions(-)
create mode 100644 include/zipr_dwarf2.hpp
diff --git a/include/ehwrite.h b/include/ehwrite.h
index 6da0040..791c52c 100644
--- a/include/ehwrite.h
+++ b/include/ehwrite.h
@@ -28,6 +28,7 @@ class EhWriterImpl_t : public EhWriter_t
bool canExtend(const EhProgramListingManip_t &other);
void extend(const uint64_t inc_amt, const EhProgramListingManip_t &other);
bool isAdvanceDirective(const std::string &s) const;
+ std::string getPrintableString(const std::string &s) const;
private:
int getMergeIndex(const EhProgramListingManip_t &other);
diff --git a/include/zipr_dwarf2.hpp b/include/zipr_dwarf2.hpp
new file mode 100644
index 0000000..2e07329
--- /dev/null
+++ b/include/zipr_dwarf2.hpp
@@ -0,0 +1,584 @@
+/*
+ Copyright 2017-2018 University of Virginia
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+
+*/
+
+#ifndef _DWARF2_H
+#define _DWARF2_H 1
+
+/* This file is derived from the DWARF specification (a public document)
+ Revision 2.0.0 (July 27, 1993) developed by the UNIX International
+ Programming Languages Special Interest Group (UI/PLSIG) and distributed
+ by UNIX International. Copies of this specification are available from
+ UNIX International, 20 Waterview Boulevard, Parsippany, NJ, 07054. */
+
+
+enum dwarf_tag
+ {
+ DW_TAG_padding = 0x00,
+ DW_TAG_array_type = 0x01,
+ DW_TAG_class_type = 0x02,
+ DW_TAG_entry_point = 0x03,
+ DW_TAG_enumeration_type = 0x04,
+ DW_TAG_formal_parameter = 0x05,
+ DW_TAG_imported_declaration = 0x08,
+ DW_TAG_label = 0x0a,
+ DW_TAG_lexical_block = 0x0b,
+ DW_TAG_member = 0x0d,
+ DW_TAG_pointer_type = 0x0f,
+ DW_TAG_reference_type = 0x10,
+ DW_TAG_compile_unit = 0x11,
+ DW_TAG_string_type = 0x12,
+ DW_TAG_structure_type = 0x13,
+ DW_TAG_subroutine_type = 0x15,
+ DW_TAG_typedef = 0x16,
+ DW_TAG_union_type = 0x17,
+ DW_TAG_unspecified_parameters = 0x18,
+ DW_TAG_variant = 0x19,
+ DW_TAG_common_block = 0x1a,
+ DW_TAG_common_inclusion = 0x1b,
+ DW_TAG_inheritance = 0x1c,
+ DW_TAG_inlined_subroutine = 0x1d,
+ DW_TAG_module = 0x1e,
+ DW_TAG_ptr_to_member_type = 0x1f,
+ DW_TAG_set_type = 0x20,
+ DW_TAG_subrange_type = 0x21,
+ DW_TAG_with_stmt = 0x22,
+ DW_TAG_access_declaration = 0x23,
+ DW_TAG_base_type = 0x24,
+ DW_TAG_catch_block = 0x25,
+ DW_TAG_const_type = 0x26,
+ DW_TAG_constant = 0x27,
+ DW_TAG_enumerator = 0x28,
+ DW_TAG_file_type = 0x29,
+ DW_TAG_friend = 0x2a,
+ DW_TAG_namelist = 0x2b,
+ DW_TAG_namelist_item = 0x2c,
+ DW_TAG_packed_type = 0x2d,
+ DW_TAG_subprogram = 0x2e,
+ DW_TAG_template_type_param = 0x2f,
+ DW_TAG_template_value_param = 0x30,
+ DW_TAG_thrown_type = 0x31,
+ DW_TAG_try_block = 0x32,
+ DW_TAG_variant_part = 0x33,
+ DW_TAG_variable = 0x34,
+ DW_TAG_volatile_type = 0x35,
+ /* SGI/MIPS Extensions */
+ DW_TAG_MIPS_loop = 0x4081,
+ /* GNU extensions */
+ DW_TAG_format_label = 0x4101, /* for FORTRAN 77 and Fortran 90 */
+ DW_TAG_function_template = 0x4102, /* for C++ */
+ DW_TAG_class_template = 0x4103, /* for C++ */
+ DW_TAG_GNU_BINCL = 0x4104,
+ DW_TAG_GNU_EINCL = 0x4105
+ };
+
+#define DW_TAG_lo_user 0x4080
+#define DW_TAG_hi_user 0xffff
+
+/* flag that tells whether entry has a child or not */
+#define DW_children_no 0
+#define DW_children_yes 1
+
+/* Form names and codes. */
+enum dwarf_form
+ {
+ DW_FORM_addr = 0x01,
+ DW_FORM_block2 = 0x03,
+ DW_FORM_block4 = 0x04,
+ DW_FORM_data2 = 0x05,
+ DW_FORM_data4 = 0x06,
+ DW_FORM_data8 = 0x07,
+ DW_FORM_string = 0x08,
+ DW_FORM_block = 0x09,
+ DW_FORM_block1 = 0x0a,
+ DW_FORM_data1 = 0x0b,
+ DW_FORM_flag = 0x0c,
+ DW_FORM_sdata = 0x0d,
+ DW_FORM_strp = 0x0e,
+ DW_FORM_udata = 0x0f,
+ DW_FORM_ref_addr = 0x10,
+ DW_FORM_ref1 = 0x11,
+ DW_FORM_ref2 = 0x12,
+ DW_FORM_ref4 = 0x13,
+ DW_FORM_ref8 = 0x14,
+ DW_FORM_ref_udata = 0x15,
+ DW_FORM_indirect = 0x16
+ };
+
+/* Attribute names and codes. */
+
+enum dwarf_attribute
+ {
+ DW_AT_sibling = 0x01,
+ DW_AT_location = 0x02,
+ DW_AT_name = 0x03,
+ DW_AT_ordering = 0x09,
+ DW_AT_subscr_data = 0x0a,
+ DW_AT_byte_size = 0x0b,
+ DW_AT_bit_offset = 0x0c,
+ DW_AT_bit_size = 0x0d,
+ DW_AT_element_list = 0x0f,
+ DW_AT_stmt_list = 0x10,
+ DW_AT_low_pc = 0x11,
+ DW_AT_high_pc = 0x12,
+ DW_AT_language = 0x13,
+ DW_AT_member = 0x14,
+ DW_AT_discr = 0x15,
+ DW_AT_discr_value = 0x16,
+ DW_AT_visibility = 0x17,
+ DW_AT_import = 0x18,
+ DW_AT_string_length = 0x19,
+ DW_AT_common_reference = 0x1a,
+ DW_AT_comp_dir = 0x1b,
+ DW_AT_const_value = 0x1c,
+ DW_AT_containing_type = 0x1d,
+ DW_AT_default_value = 0x1e,
+ DW_AT_inline = 0x20,
+ DW_AT_is_optional = 0x21,
+ DW_AT_lower_bound = 0x22,
+ DW_AT_producer = 0x25,
+ DW_AT_prototyped = 0x27,
+ DW_AT_return_addr = 0x2a,
+ DW_AT_start_scope = 0x2c,
+ DW_AT_stride_size = 0x2e,
+ DW_AT_upper_bound = 0x2f,
+ DW_AT_abstract_origin = 0x31,
+ DW_AT_accessibility = 0x32,
+ DW_AT_address_class = 0x33,
+ DW_AT_artificial = 0x34,
+ DW_AT_base_types = 0x35,
+ DW_AT_calling_convention = 0x36,
+ DW_AT_count = 0x37,
+ DW_AT_data_member_location = 0x38,
+ DW_AT_decl_column = 0x39,
+ DW_AT_decl_file = 0x3a,
+ DW_AT_decl_line = 0x3b,
+ DW_AT_declaration = 0x3c,
+ DW_AT_discr_list = 0x3d,
+ DW_AT_encoding = 0x3e,
+ DW_AT_external = 0x3f,
+ DW_AT_frame_base = 0x40,
+ DW_AT_friend = 0x41,
+ DW_AT_identifier_case = 0x42,
+ DW_AT_macro_info = 0x43,
+ DW_AT_namelist_items = 0x44,
+ DW_AT_priority = 0x45,
+ DW_AT_segment = 0x46,
+ DW_AT_specification = 0x47,
+ DW_AT_static_link = 0x48,
+ DW_AT_type = 0x49,
+ DW_AT_use_location = 0x4a,
+ DW_AT_variable_parameter = 0x4b,
+ DW_AT_virtuality = 0x4c,
+ DW_AT_vtable_elem_location = 0x4d,
+ /* SGI/MIPS Extensions */
+ DW_AT_MIPS_fde = 0x2001,
+ DW_AT_MIPS_loop_begin = 0x2002,
+ DW_AT_MIPS_tail_loop_begin = 0x2003,
+ DW_AT_MIPS_epilog_begin = 0x2004,
+ DW_AT_MIPS_loop_unroll_factor = 0x2005,
+ DW_AT_MIPS_software_pipeline_depth = 0x2006,
+ DW_AT_MIPS_linkage_name = 0x2007,
+ DW_AT_MIPS_stride = 0x2008,
+ DW_AT_MIPS_abstract_name = 0x2009,
+ DW_AT_MIPS_clone_origin = 0x200a,
+ DW_AT_MIPS_has_inlines = 0x200b,
+ /* GNU extensions. */
+ DW_AT_sf_names = 0x2101,
+ DW_AT_src_info = 0x2102,
+ DW_AT_mac_info = 0x2103,
+ DW_AT_src_coords = 0x2104,
+ DW_AT_body_begin = 0x2105,
+ DW_AT_body_end = 0x2106
+ };
+
+#define DW_AT_lo_user 0x2000 /* implementation-defined range start */
+#define DW_AT_hi_user 0x3ff0 /* implementation-defined range end */
+
+/* Location atom names and codes. */
+
+enum dwarf_location_atom
+ {
+ DW_OP_addr = 0x03,
+ DW_OP_deref = 0x06,
+ DW_OP_const1u = 0x08,
+ DW_OP_const1s = 0x09,
+ DW_OP_const2u = 0x0a,
+ DW_OP_const2s = 0x0b,
+ DW_OP_const4u = 0x0c,
+ DW_OP_const4s = 0x0d,
+ DW_OP_const8u = 0x0e,
+ DW_OP_const8s = 0x0f,
+ DW_OP_constu = 0x10,
+ DW_OP_consts = 0x11,
+ DW_OP_dup = 0x12,
+ DW_OP_drop = 0x13,
+ DW_OP_over = 0x14,
+ DW_OP_pick = 0x15,
+ DW_OP_swap = 0x16,
+ DW_OP_rot = 0x17,
+ DW_OP_xderef = 0x18,
+ DW_OP_abs = 0x19,
+ DW_OP_and = 0x1a,
+ DW_OP_div = 0x1b,
+ DW_OP_minus = 0x1c,
+ DW_OP_mod = 0x1d,
+ DW_OP_mul = 0x1e,
+ DW_OP_neg = 0x1f,
+ DW_OP_not = 0x20,
+ DW_OP_or = 0x21,
+ DW_OP_plus = 0x22,
+ DW_OP_plus_uconst = 0x23,
+ DW_OP_shl = 0x24,
+ DW_OP_shr = 0x25,
+ DW_OP_shra = 0x26,
+ DW_OP_xor = 0x27,
+ DW_OP_bra = 0x28,
+ DW_OP_eq = 0x29,
+ DW_OP_ge = 0x2a,
+ DW_OP_gt = 0x2b,
+ DW_OP_le = 0x2c,
+ DW_OP_lt = 0x2d,
+ DW_OP_ne = 0x2e,
+ DW_OP_skip = 0x2f,
+ DW_OP_lit0 = 0x30,
+ DW_OP_lit1 = 0x31,
+ DW_OP_lit2 = 0x32,
+ DW_OP_lit3 = 0x33,
+ DW_OP_lit4 = 0x34,
+ DW_OP_lit5 = 0x35,
+ DW_OP_lit6 = 0x36,
+ DW_OP_lit7 = 0x37,
+ DW_OP_lit8 = 0x38,
+ DW_OP_lit9 = 0x39,
+ DW_OP_lit10 = 0x3a,
+ DW_OP_lit11 = 0x3b,
+ DW_OP_lit12 = 0x3c,
+ DW_OP_lit13 = 0x3d,
+ DW_OP_lit14 = 0x3e,
+ DW_OP_lit15 = 0x3f,
+ DW_OP_lit16 = 0x40,
+ DW_OP_lit17 = 0x41,
+ DW_OP_lit18 = 0x42,
+ DW_OP_lit19 = 0x43,
+ DW_OP_lit20 = 0x44,
+ DW_OP_lit21 = 0x45,
+ DW_OP_lit22 = 0x46,
+ DW_OP_lit23 = 0x47,
+ DW_OP_lit24 = 0x48,
+ DW_OP_lit25 = 0x49,
+ DW_OP_lit26 = 0x4a,
+ DW_OP_lit27 = 0x4b,
+ DW_OP_lit28 = 0x4c,
+ DW_OP_lit29 = 0x4d,
+ DW_OP_lit30 = 0x4e,
+ DW_OP_lit31 = 0x4f,
+ DW_OP_reg0 = 0x50,
+ DW_OP_reg1 = 0x51,
+ DW_OP_reg2 = 0x52,
+ DW_OP_reg3 = 0x53,
+ DW_OP_reg4 = 0x54,
+ DW_OP_reg5 = 0x55,
+ DW_OP_reg6 = 0x56,
+ DW_OP_reg7 = 0x57,
+ DW_OP_reg8 = 0x58,
+ DW_OP_reg9 = 0x59,
+ DW_OP_reg10 = 0x5a,
+ DW_OP_reg11 = 0x5b,
+ DW_OP_reg12 = 0x5c,
+ DW_OP_reg13 = 0x5d,
+ DW_OP_reg14 = 0x5e,
+ DW_OP_reg15 = 0x5f,
+ DW_OP_reg16 = 0x60,
+ DW_OP_reg17 = 0x61,
+ DW_OP_reg18 = 0x62,
+ DW_OP_reg19 = 0x63,
+ DW_OP_reg20 = 0x64,
+ DW_OP_reg21 = 0x65,
+ DW_OP_reg22 = 0x66,
+ DW_OP_reg23 = 0x67,
+ DW_OP_reg24 = 0x68,
+ DW_OP_reg25 = 0x69,
+ DW_OP_reg26 = 0x6a,
+ DW_OP_reg27 = 0x6b,
+ DW_OP_reg28 = 0x6c,
+ DW_OP_reg29 = 0x6d,
+ DW_OP_reg30 = 0x6e,
+ DW_OP_reg31 = 0x6f,
+ DW_OP_breg0 = 0x70,
+ DW_OP_breg1 = 0x71,
+ DW_OP_breg2 = 0x72,
+ DW_OP_breg3 = 0x73,
+ DW_OP_breg4 = 0x74,
+ DW_OP_breg5 = 0x75,
+ DW_OP_breg6 = 0x76,
+ DW_OP_breg7 = 0x77,
+ DW_OP_breg8 = 0x78,
+ DW_OP_breg9 = 0x79,
+ DW_OP_breg10 = 0x7a,
+ DW_OP_breg11 = 0x7b,
+ DW_OP_breg12 = 0x7c,
+ DW_OP_breg13 = 0x7d,
+ DW_OP_breg14 = 0x7e,
+ DW_OP_breg15 = 0x7f,
+ DW_OP_breg16 = 0x80,
+ DW_OP_breg17 = 0x81,
+ DW_OP_breg18 = 0x82,
+ DW_OP_breg19 = 0x83,
+ DW_OP_breg20 = 0x84,
+ DW_OP_breg21 = 0x85,
+ DW_OP_breg22 = 0x86,
+ DW_OP_breg23 = 0x87,
+ DW_OP_breg24 = 0x88,
+ DW_OP_breg25 = 0x89,
+ DW_OP_breg26 = 0x8a,
+ DW_OP_breg27 = 0x8b,
+ DW_OP_breg28 = 0x8c,
+ DW_OP_breg29 = 0x8d,
+ DW_OP_breg30 = 0x8e,
+ DW_OP_breg31 = 0x8f,
+ DW_OP_regx = 0x90,
+ DW_OP_fbreg = 0x91,
+ DW_OP_bregx = 0x92,
+ DW_OP_piece = 0x93,
+ DW_OP_deref_size = 0x94,
+ DW_OP_xderef_size = 0x95,
+ DW_OP_nop = 0x96
+ };
+
+#define DW_OP_lo_user 0x80 /* implementation-defined range start */
+#define DW_OP_hi_user 0xff /* implementation-defined range end */
+
+/* Type encodings. */
+
+enum dwarf_type
+ {
+ DW_ATE_void = 0x0,
+ DW_ATE_address = 0x1,
+ DW_ATE_boolean = 0x2,
+ DW_ATE_complex_float = 0x3,
+ DW_ATE_float = 0x4,
+ DW_ATE_signed = 0x5,
+ DW_ATE_signed_char = 0x6,
+ DW_ATE_unsigned = 0x7,
+ DW_ATE_unsigned_char = 0x8
+ };
+
+#define DW_ATE_lo_user 0x80
+#define DW_ATE_hi_user 0xff
+
+/* Array ordering names and codes. */
+enum dwarf_array_dim_ordering
+ {
+ DW_ORD_row_major = 0,
+ DW_ORD_col_major = 1
+ };
+
+/* access attribute */
+enum dwarf_access_attribute
+ {
+ DW_ACCESS_public = 1,
+ DW_ACCESS_protected = 2,
+ DW_ACCESS_private = 3
+ };
+
+/* visibility */
+enum dwarf_visibility_attribute
+ {
+ DW_VIS_local = 1,
+ DW_VIS_exported = 2,
+ DW_VIS_qualified = 3
+ };
+
+/* virtuality */
+enum dwarf_virtuality_attribute
+ {
+ DW_VIRTUALITY_none = 0,
+ DW_VIRTUALITY_virtual = 1,
+ DW_VIRTUALITY_pure_virtual = 2
+ };
+
+/* case sensitivity */
+enum dwarf_id_case
+ {
+ DW_ID_case_sensitive = 0,
+ DW_ID_up_case = 1,
+ DW_ID_down_case = 2,
+ DW_ID_case_insensitive = 3
+ };
+
+/* calling convention */
+enum dwarf_calling_convention
+ {
+ DW_CC_normal = 0x1,
+ DW_CC_program = 0x2,
+ DW_CC_nocall = 0x3
+ };
+
+#define DW_CC_lo_user 0x40
+#define DW_CC_hi_user 0xff
+
+/* inline attribute */
+enum dwarf_inline_attribute
+ {
+ DW_INL_not_inlined = 0,
+ DW_INL_inlined = 1,
+ DW_INL_declared_not_inlined = 2,
+ DW_INL_declared_inlined = 3
+ };
+
+/* discriminant lists */
+enum dwarf_discrim_list
+ {
+ DW_DSC_label = 0,
+ DW_DSC_range = 1
+ };
+
+/* line number opcodes */
+enum dwarf_line_number_ops
+ {
+ DW_LNS_extended_op = 0,
+ DW_LNS_copy = 1,
+ DW_LNS_advance_pc = 2,
+ DW_LNS_advance_line = 3,
+ DW_LNS_set_file = 4,
+ DW_LNS_set_column = 5,
+ DW_LNS_negate_stmt = 6,
+ DW_LNS_set_basic_block = 7,
+ DW_LNS_const_add_pc = 8,
+ DW_LNS_fixed_advance_pc = 9
+ };
+
+/* line number extended opcodes */
+enum dwarf_line_number_x_ops
+ {
+ DW_LNE_end_sequence = 1,
+ DW_LNE_set_address = 2,
+ DW_LNE_define_file = 3
+ };
+
+/* call frame information */
+enum dwarf_call_frame_info
+ {
+ DW_CFA_advance_loc = 0x40,
+ DW_CFA_offset = 0x80,
+ DW_CFA_restore = 0xc0,
+ DW_CFA_nop = 0x00,
+ DW_CFA_set_loc = 0x01,
+ DW_CFA_advance_loc1 = 0x02,
+ DW_CFA_advance_loc2 = 0x03,
+ DW_CFA_advance_loc4 = 0x04,
+ DW_CFA_offset_extended = 0x05,
+ DW_CFA_restore_extended = 0x06,
+ DW_CFA_undefined = 0x07,
+ DW_CFA_same_value = 0x08,
+ DW_CFA_register = 0x09,
+ DW_CFA_remember_state = 0x0a,
+ DW_CFA_restore_state = 0x0b,
+ DW_CFA_def_cfa = 0x0c,
+ DW_CFA_def_cfa_register = 0x0d,
+ DW_CFA_def_cfa_offset = 0x0e,
+ DW_CFA_def_cfa_expression = 0x0f,
+ DW_CFA_expression = 0x10,
+ /* Dwarf 2.1 */
+ DW_CFA_offset_extended_sf = 0x11,
+ DW_CFA_def_cfa_sf = 0x12,
+ DW_CFA_def_cfa_offset_sf = 0x13,
+ /* added by jdh for newer version of dwarf? libc uses this in ubuntu 14.04 */
+ DW_CFA_val_offset = 0x14,
+ DW_CFA_val_offset_sf = 0x15,
+ DW_CFA_val_expression = 0x16,
+
+
+ /* SGI/MIPS specific */
+ DW_CFA_MIPS_advance_loc8 = 0x1d,
+
+ /* GNU extensions */
+ DW_CFA_GNU_window_save = 0x2d,
+ DW_CFA_GNU_args_size = 0x2e,
+ DW_CFA_GNU_negative_offset_extended = 0x2f
+ };
+
+#define DW_CIE_ID 0xffffffff
+#define DW_CIE_VERSION 1
+
+#define DW_CFA_extended 0
+#define DW_CFA_low_user 0x1c
+#define DW_CFA_high_user 0x3f
+
+#define DW_CHILDREN_no 0x00
+#define DW_CHILDREN_yes 0x01
+
+#define DW_ADDR_none 0
+
+/* Source language names and codes. */
+
+enum dwarf_source_language
+ {
+ DW_LANG_C89 = 0x0001,
+ DW_LANG_C = 0x0002,
+ DW_LANG_Ada83 = 0x0003,
+ DW_LANG_C_plus_plus = 0x0004,
+ DW_LANG_Cobol74 = 0x0005,
+ DW_LANG_Cobol85 = 0x0006,
+ DW_LANG_Fortran77 = 0x0007,
+ DW_LANG_Fortran90 = 0x0008,
+ DW_LANG_Pascal83 = 0x0009,
+ DW_LANG_Modula2 = 0x000a,
+ DW_LANG_Java = 0x000b,
+ DW_LANG_Mips_Assembler = 0x8001
+ };
+
+
+#define DW_LANG_lo_user 0x8000 /* implementation-defined range start */
+#define DW_LANG_hi_user 0xffff /* implementation-defined range start */
+
+/* Names and codes for macro information. */
+
+enum dwarf_macinfo_record_type
+ {
+ DW_MACINFO_define = 1,
+ DW_MACINFO_undef = 2,
+ DW_MACINFO_start_file = 3,
+ DW_MACINFO_end_file = 4,
+ DW_MACINFO_vendor_ext = 255
+ };
+
+
+/* @@@ For use with GNU frame unwind information. */
+
+#define DW_EH_PE_absptr 0x00
+#define DW_EH_PE_omit 0xff
+
+#define DW_EH_PE_uleb128 0x01
+#define DW_EH_PE_udata2 0x02
+#define DW_EH_PE_udata4 0x03
+#define DW_EH_PE_udata8 0x04
+#define DW_EH_PE_sleb128 0x09
+#define DW_EH_PE_sdata2 0x0A
+#define DW_EH_PE_sdata4 0x0B
+#define DW_EH_PE_sdata8 0x0C
+#define DW_EH_PE_signed 0x08
+
+#define DW_EH_PE_pcrel 0x10
+#define DW_EH_PE_textrel 0x20
+#define DW_EH_PE_datarel 0x30
+#define DW_EH_PE_funcrel 0x40
+#define DW_EH_PE_aligned 0x50
+
+#define DW_EH_PE_indirect 0x80
+
+#endif /* dwarf2.h */
diff --git a/src/ehwrite.cpp b/src/ehwrite.cpp
index 2dafa69..4d8ad7e 100644
--- a/src/ehwrite.cpp
+++ b/src/ehwrite.cpp
@@ -15,10 +15,11 @@
#include <fstream>
#include <elf.h>
+#include <zipr_dwarf2.hpp>
+
#include "elfio/elfio.hpp"
#include "elfio/elfio_dump.hpp"
#include "targ-config.h"
-//#include "beaengine/BeaEngine.h"
using namespace libIRDB;
using namespace std;
@@ -322,6 +323,301 @@ bool EhWriterImpl_t<ptrsize>::EhProgramListingManip_t::isAdvanceDirective(const
}
+// see https://en.wikipedia.org/wiki/LEB128
+template <int ptrsize>
+static bool read_uleb128
+ ( uint64_t &result,
+ uint32_t& position,
+ const uint8_t* const data,
+ const uint32_t max)
+{
+ result = 0;
+ auto shift = 0;
+ while( position < max )
+ {
+ auto byte = data[position];
+ position++;
+ result |= ( ( byte & 0x7f ) << shift);
+ if ( ( byte & 0x80) == 0)
+ break;
+ shift += 7;
+ }
+ return ( position > max );
+
+}
+
+// see https://en.wikipedia.org/wiki/LEB128
+template <int ptrsize>
+static bool read_sleb128 (
+ int64_t &result,
+ uint32_t & position,
+ const uint8_t* const data,
+ const uint32_t max)
+{
+ result = 0;
+ auto shift = 0;
+ auto size = 64; // number of bits in signed integer;
+ auto byte=uint8_t(0);
+ do
+ {
+ byte = data [position];
+ position++;
+ result |= ((byte & 0x7f)<< shift);
+ shift += 7;
+ } while( (byte & 0x80) != 0);
+
+ /* sign bit of byte is second high order bit (0x40) */
+ if ((shift < size) && ( (byte & 0x40) !=0 /* sign bit of byte is set */))
+ /* sign extend */
+ result |= - (1 << shift);
+ return ( position > max );
+
+}
+
+
+
+
+template <int ptrsize>
+static void print_uleb_operand(
+ stringstream &sout,
+ uint32_t pos,
+ const uint8_t* const data,
+ const uint32_t max)
+{
+ auto uleb=uint64_t(0xdeadbeef);
+ read_uleb128<ptrsize>(uleb, pos, data, max);
+ sout<<" "<<dec<<uleb;
+}
+
+template <int ptrsize>
+static void print_sleb_operand(
+ stringstream &sout,
+ uint32_t pos,
+ const uint8_t* const data,
+ const uint32_t max)
+{
+ auto leb=int64_t(0xdeadbeef);
+ read_sleb128<ptrsize>(leb, pos, data, max);
+ sout<<" "<<dec<<leb;
+}
+
+
+
+template <int ptrsize>
+string EhWriterImpl_t<ptrsize>::EhProgramListingManip_t::getPrintableString(const string &s) const
+{
+
+ stringstream sout;
+ // make sure uint8_t is an unsigned char.
+ static_assert(std::is_same<unsigned char, uint8_t>::value, "uint8_t is not unsigned char");
+
+ auto data=s;
+ auto opcode=(uint8_t)data[0];
+ auto opcode_upper2=(uint8_t)(opcode >> 6);
+ auto opcode_lower6=(uint8_t)(opcode & (0x3f));
+ auto pos=uint32_t(1);
+ auto max=data.size();
+
+ switch(opcode_upper2)
+ {
+ case 1:
+ {
+ // case DW_CFA_advance_loc:
+ sout<<" cfa_advance_loc "<<dec<<+opcode_lower6<<" * caf";
+ break;
+ }
+ case 2:
+ {
+ uint64_t uleb=0;
+ sout<<" cfa_offset ";
+ if(read_uleb128<ptrsize>(uleb, pos, (const uint8_t* const)data.data(), max))
+ break;
+ // case DW_CFA_offset:
+ sout <<dec<<uleb;
+ break;
+ }
+ case 3:
+ {
+ // case DW_CFA_restore (register #):
+ sout<<" cfa_restore";
+ break;
+ }
+ case 0:
+ {
+ switch(opcode_lower6)
+ {
+
+ case DW_CFA_nop:
+ sout<<" nop" ;
+ break;
+ case DW_CFA_remember_state:
+ sout<<" remember_state" ;
+ break;
+ case DW_CFA_restore_state:
+ sout<<" restore_state" ;
+ break;
+
+ // takes single uleb128
+ case DW_CFA_undefined:
+ sout<<" undefined" ;
+ print_uleb_operand<ptrsize>(sout,pos,(const uint8_t* const)data.data(),max);
+ break;
+
+ case DW_CFA_same_value:
+ sout<<" same_value ";
+ print_uleb_operand<ptrsize>(sout,pos,(const uint8_t* const)data.data(),max);
+ break;
+ case DW_CFA_restore_extended:
+ sout<<" restore_extended ";
+ print_uleb_operand<ptrsize>(sout,pos,(const uint8_t* const)data.data(),max);
+ break;
+ case DW_CFA_def_cfa_register:
+ sout<<" def_cfa_register ";
+ print_uleb_operand<ptrsize>(sout,pos,(const uint8_t* const)data.data(),max);
+ break;
+ case DW_CFA_GNU_args_size:
+ sout<<" GNU_arg_size ";
+ print_uleb_operand<ptrsize>(sout,pos,(const uint8_t* const)data.data(),max);
+ break;
+ case DW_CFA_def_cfa_offset:
+ sout<<" def_cfa_offset ";
+ print_uleb_operand<ptrsize>(sout,pos,(const uint8_t* const)data.data(),max);
+ break;
+
+ case DW_CFA_set_loc:
+ {
+ auto arg=uintptr_t(0xDEADBEEF);
+ switch(ptrsize)
+ {
+ case 4:
+ arg=*(uint32_t*)&data.data()[pos]; break;
+ case 8:
+ arg=*(uint64_t*)&data.data()[pos]; break;
+ default:
+ assert(0);
+ }
+ sout<<" set_loc "<<hex<<arg;
+ break;
+ }
+ case DW_CFA_advance_loc1:
+ {
+ auto loc=*(uint8_t*)(&data.data()[pos]);
+ sout<<" advance_loc1 "<<+loc<<" * caf " ;
+ break;
+ }
+
+ case DW_CFA_advance_loc2:
+ {
+ auto loc=*(uint16_t*)(&data.data()[pos]);
+ sout<<" advance_loc2 "<<+loc<<" * caf " ;
+ break;
+ }
+
+ case DW_CFA_advance_loc4:
+ {
+ auto loc=*(uint32_t*)(&data.data()[pos]);
+ sout<<" advance_loc4 "<<+loc<<" * caf " ;
+ break;
+ }
+ case DW_CFA_offset_extended:
+ sout<<" offset_extended ";
+ print_uleb_operand<ptrsize>(sout,pos,(const uint8_t* const)data.data(),max);
+ print_uleb_operand<ptrsize>(sout,pos,(const uint8_t* const)data.data(),max);
+ break;
+ case DW_CFA_register:
+ sout<<" register ";
+ print_uleb_operand<ptrsize>(sout,pos,(const uint8_t* const)data.data(),max);
+ print_uleb_operand<ptrsize>(sout,pos,(const uint8_t* const)data.data(),max);
+ break;
+ case DW_CFA_def_cfa:
+ sout<<" def_cfa ";
+ print_uleb_operand<ptrsize>(sout,pos,(const uint8_t* const)data.data(),max);
+ print_uleb_operand<ptrsize>(sout,pos,(const uint8_t* const)data.data(),max);
+ break;
+ case DW_CFA_def_cfa_sf:
+ sout<<" def_cfa_sf ";
+ print_uleb_operand<ptrsize>(sout,pos,(const uint8_t* const)data.data(),max);
+ print_sleb_operand<ptrsize>(sout,pos,(const uint8_t* const)data.data(),max);
+ break;
+
+ case DW_CFA_def_cfa_expression:
+ {
+ auto uleb=uint64_t(0);
+ sout<<" def_cfa_expression ";
+ if(read_uleb128<ptrsize>(uleb, pos, (const uint8_t* const)data.data(), max))
+ break;
+ sout <<dec<<uleb;
+ pos+=uleb; // doing this old school for now, as we aren't printing the expression.
+ sout <<" (not printing expression)";
+ break;
+ }
+ case DW_CFA_expression:
+ {
+ auto uleb1=uint64_t(0);
+ auto uleb2=uint64_t(0);
+ sout<<" expression ";
+ if(read_uleb128<ptrsize>(uleb1, pos, (const uint8_t* const)data.data(), max))
+ break;
+ if(read_uleb128<ptrsize>(uleb2, pos, (const uint8_t* const)data.data(), max))
+ break;
+ sout<<dec<<uleb1<<" "<<uleb2;
+ pos+=uleb2;
+ break;
+ }
+ case DW_CFA_val_expression:
+ {
+ auto uleb1=uint64_t(0);
+ auto uleb2=uint64_t(0);
+ sout<<" val_expression ";
+ if(read_uleb128<ptrsize>(uleb1, pos, (const uint8_t* const)data.data(), max))
+ break;
+ if(read_uleb128<ptrsize>(uleb2, pos, (const uint8_t* const)data.data(), max))
+ break;
+ sout <<dec<<uleb1<<" "<<uleb2;
+ pos+=uleb2;
+ break;
+ }
+ case DW_CFA_def_cfa_offset_sf:
+ {
+ auto leb=int64_t(0);
+ sout<<" def_cfa_offset_sf ";
+ if(read_sleb128<ptrsize>(leb, pos, (const uint8_t* const)data.data(), max))
+ break;
+ sout <<dec<<leb;
+ break;
+ }
+ case DW_CFA_offset_extended_sf:
+ {
+ auto uleb1=uint64_t(0);
+ auto sleb2=int64_t(0);
+ sout<<" offset_extended_sf ";
+ if(read_uleb128<ptrsize>(uleb1, pos, (const uint8_t* const)data.data(), max))
+ break;
+ if(read_sleb128<ptrsize>(sleb2, pos, (const uint8_t* const)data.data(), max))
+ break;
+ sout <<dec<<uleb1<<" "<<sleb2;
+ break;
+ }
+
+
+ /* SGI/MIPS specific */
+ case DW_CFA_MIPS_advance_loc8:
+
+ /* GNU extensions */
+ case DW_CFA_GNU_window_save:
+ case DW_CFA_GNU_negative_offset_extended:
+ default:
+ sout<<"Unhandled opcode cannot print. opcode="<<opcode;
+ }
+ break;
+ }
+ default:
+ assert(0);
+ }
+
+ return sout.str();
+}
+
template <int ptrsize>
EhWriterImpl_t<ptrsize>::FDErepresentation_t::LSDArepresentation_t::LSDArepresentation_t(Instruction_t* insn)
// if there are call sites, use the call site encoding. if not, set to omit for initializer.
@@ -613,7 +909,7 @@ void EhWriterImpl_t<ptrsize>::GenerateEhOutput()
first=false;
out<<"0x"<<hex<<setfill('0')<<setw(2)<<((int)c&0xff);
}
- out << endl;
+ out << " # " << p.getPrintableString(s)<<endl;
}
out.flags(flags); // restore flags
};
@@ -709,30 +1005,30 @@ void EhWriterImpl_t<ptrsize>::GenerateEhOutput()
const auto cs_end_addr=zipr_obj.GetLocationMap()->at(cs.cs_insn_start)+cs.cs_insn_start->GetDataBits().size();
const auto cs_len=cs_end_addr-cs_start_addr;
out<<"LSDA"<<dec<<lsda_num<<"_cs_tab_entry"<<cs_num<<"_start:"<<endl;
- out<<" # 1) start of call site relative to FDE start addr"<<endl;
- out<<" .uleb128 0x"<<hex<<cs_start_addr<<" - 0x"<<hex<<fde->start_addr<<endl;
- out<<" # 2) length of call site"<<endl;
- out<<" .uleb128 "<<dec<<cs_len<<endl;
+ out<<" # 1) start of call site relative to FDE start addr (call site encoding)"<<endl;
+ out<<" .sleb128 0x"<<hex<<cs_start_addr<<" - 0x"<<hex<<fde->start_addr<<endl;
+ out<<" # 2) length of call site (call site encoding)"<<endl;
+ out<<" .sleb128 "<<dec<<cs_len<<endl;
if(cs.landing_pad)
{
const auto lp_addr=zipr_obj.GetLocationMap()->at(cs.landing_pad);
- out<<" # 3) the landing pad, or 0 if none exists."<<endl;
- out<<" .uleb128 0x"<<hex<<lp_addr<<" - 0x"<<hex<<landing_pad_base<<endl;
+ out<<" # 3) the landing pad, or 0 if none exists. (call site encoding)"<<endl;
+ out<<" .sleb128 0x"<<hex<<lp_addr<<" - 0x"<<hex<<landing_pad_base<<endl;
}
else
{
- out<<" # 3) the landing pad, or 0 if none exists."<<endl;
- out<<" .uleb128 0"<<endl;
+ out<<" # 3) the landing pad, or 0 if none exists. (call site encoding)"<<endl;
+ out<<" .sleb128 0"<<endl;
}
if(cs.actions.size() > 0 )
{
- out<<" # 4) index into action table + 1 -- 0 indicates unwind only"<<endl;
- out<<" .uleb128 1 + LSDA"<<dec<<lsda_num<<"_act"
+ out<<" # 4) index into action table + 1 -- 0 indicates unwind only (call site encoding)"<<endl;
+ out<<" .sleb128 1 + LSDA"<<dec<<lsda_num<<"_act"
<<cs.action_table_index<<"_start_entry0 - LSDA"<<dec<<lsda_num<<"_action_tab_start"<<endl;
}
else
{
- out<<" # 4) index into action table + 1 -- 0 indicates unwind only"<<endl;
+ out<<" # 4) index into action table + 1 -- 0 indicates unwind only (always uleb)"<<endl;
out<<" .uleb128 0 # no actions!" << endl;
}
out<<"LSDA"<<dec<<lsda_num<<"_cs_tab_entry"<<cs_num<<"_end:"<<endl;
@@ -773,7 +1069,7 @@ void EhWriterImpl_t<ptrsize>::GenerateEhOutput()
out<<"LSDA"<<dec<<lsda_num<<"_tt_ptr_end:"<<endl;
out<<""<<endl;
out<<" # 5) call site table encoding"<<endl;
- out<<" .byte 0x1 # DW_EH_PE_uleb128 "<<endl;
+ out<<" .byte 0x9 # DW_EH_PE_sleb128 "<<endl;
out<<""<<endl;
out<<" # 6) the length of the call site table"<<endl;
out<<" .uleb128 LSDA"<<dec<<lsda_num<<"_cs_tab_end-LSDA"<<dec<<lsda_num<<"_cs_tab_start"<<endl;
--
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