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feat: barebones DIE parsing up to code 0x1a

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Phireh 2023-09-24 17:16:22 +02:00
commit 0893dad383
Signed by: Phireh
GPG key ID: DD169F1BA658A5E5
1 changed files with 115 additions and 19 deletions
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134
main.cpp
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@ -206,6 +206,20 @@ void parse_debuginfo_section(const void *file)
p+= 8;
fprintf(stdout, "\t%#x\n", addr_value);
} break;
case DW_FORM_block2: // 0x03
{
uint16_t length = *(uint16_t*)p;
p += 2;
fprintf(stdout, "\t%d byte sized data block\n", length);
p += length;
} break;
case DW_FORM_block4: // 0x04
{
uint32_t length = *(uint32_t*)p;
p += 4;
fprintf(stdout, "\t%d byte sized data block\n", length);
p += length;
} break;
case DW_FORM_data2: // 0x05
{
uint16_t data = *(uint16_t*)p;
@ -218,7 +232,7 @@ void parse_debuginfo_section(const void *file)
p += 4;
fprintf(stdout, "\t%#x\n", data);
} break;
case DW_FORM_data8: // 0x06
case DW_FORM_data8: // 0x07
{
uint64_t data = *(uint64_t*)p;
p += 8;
@ -230,7 +244,22 @@ void parse_debuginfo_section(const void *file)
fprintf(stdout, "\t%s\n", p);
while (*p++);
} break;
case DW_FORM_data1: // 0x13
case DW_FORM_block: // 0x09
{
uint64_t length = 0;
p += decode_leb128((uint8_t*)p, &length);
fprintf(stdout, "\t%d byte sized data block\n", length);
p += length;
while (*p++);
} break;
case DW_FORM_block1: // 0x0a
{
uint8_t length = *(uint8_t*)p;
fprintf(stdout, "\t%d byte sized data block\n", length);
p += length;
while (*p++);
} break;
case DW_FORM_data1: // 0x0b
{
uint8_t data = *(uint8_t*)p;
p += 1;
@ -239,12 +268,83 @@ void parse_debuginfo_section(const void *file)
else
fprintf(stdout, "\t%#x\n", data);
} break;
case DW_FORM_ref8:
case DW_FORM_flag: // 0x0c
{
uint64_t data = *(uint64_t*)p;
uint8_t value = *(uint8_t*)p;
p += 1;
fprintf(stdout, "\t%d\n", value);
} break;
case DW_FORM_sdata: // 0x0d
{
int64_t value;
p += decode_sleb128((uint8_t*)p, &value);
fprintf(stdout, "\t%d\n", value);
} break;
case DW_FORM_strp: // 0x0e
{
// TODO: 32 addresses
// read offset into .debug_str of desired string
uint64_t str_offset = *(uint64_t*)p;
p+= 8;
fprintf(stdout, "\t%#x\n", data);
uint64_t section_offset = get_offset_of_section(file, ".debug_str");
char *string = (char*)file + section_offset + str_offset;
fprintf(stdout, "\t%s\n", string);
} break;
case DW_FORM_udata: // 0x0f
{
uint64_t value;
p += decode_leb128((uint8_t*)p, &value);
fprintf(stdout, "\t%d\n", value);
} break;
case DW_FORM_ref_addr: // 0x10
{
// TODO: dwarf32
uint64_t offset = *(uint64_t*)p;
p += 8;
// TODO: fetch the actual value
fprintf(stdout, "\toffset %#x\n", offset);
} break;
case DW_FORM_ref1: // 0x11
{
uint8_t offset = *(uint8_t*)p;
p += 1;
// TODO: fetch the actual value
fprintf(stdout, "\toffset %#x\n", offset);
} break;
case DW_FORM_ref2: // 0x12
{
uint16_t offset = *(uint16_t*)p;
p += 2;
// TODO: fetch the actual value
fprintf(stdout, "\toffset %#x\n", offset);
} break;
case DW_FORM_ref4: // 0x13
{
uint32_t offset = *(uint32_t*)p;
p += 4;
// TODO: fetch the actual value
fprintf(stdout, "\toffset %#x\n", offset);
} break;
case DW_FORM_ref8: // 0x14
{
uint64_t offset = *(uint64_t*)p;
p += 8;
// TODO: fetch the actual value
fprintf(stdout, "\t%#x\n", offset);
} break;
case DW_FORM_ref_udata: // 0x15
{
uint64_t offset;
p += decode_leb128((uint8_t*)p, &offset);
// TODO: fetch the actual value
fprintf(stdout, "\t%#x\n", offset);
} break;
case DW_FORM_indirect: // 0x16
{
uint64_t form;
p += decode_leb128((uint8_t*)p, &form);
// TODO: fetch the actual value
fprintf(stdout, "\tTODO\n");
} break;
case DW_FORM_sec_offset: // 0x17
{
@ -266,27 +366,23 @@ void parse_debuginfo_section(const void *file)
p += length;
fprintf(stdout, "(%d bytes data)\n", length);
} break;
case DW_FORM_flag_present:
case DW_FORM_flag_present: // 0x19
{
// Nothing to read here, flag_present just indicates that a flag is ON. We output '1' just like objdump does
fprintf(stdout, "\t1\n");
} break;
case DW_FORM_implicit_const:
case DW_FORM_strx: // 0x1a
{
uint64_t offset;
p += decode_leb128((uint8_t*)p, &offset);
uint64_t section_offset = get_offset_of_section(file, ".debug_str_offsets");
fprintf(stdout, "\t%s\n", (char*)file + section_offset + offset);
} break;
case DW_FORM_implicit_const: // 0x21
{
// We already have the value, do not advance the pointer at all
fprintf(stdout, "\t%#x\n", abbrev_table.specs[code-1][i].value);
} break;
case DW_FORM_strp: // 0x0e
{
// TODO: 32 addresses
// read offset into .debug_str of desired string
uint64_t str_offset = *(uint64_t*)p;
p+= 8;
uint64_t section_offset = get_offset_of_section(file, ".debug_str");
char *string = (char*)file + section_offset + str_offset;
fprintf(stdout, "\t%s\n", string);
} break;
case DW_FORM_line_strp: // 0x1f
{
// TODO: 32 addresses