feat(bin/readcoff): display symtab
This commit is contained in:
parent
164c1de23f
commit
a12220d492
4 changed files with 183 additions and 26 deletions
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@ -5,11 +5,13 @@
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static char *prg_name;
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static char *outfile = "a.out";
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typedef struct section
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{
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typedef struct {
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} Section;
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typedef struct {
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} Object;
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static void
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usage(int retcode)
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@ -45,7 +47,7 @@ main(int argc, char **argv)
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FILHDR fhdr;
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SCNHDR shdr;
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uint8_t *buffer;
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SYM entry;
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SYMENT entry;
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RELOC reloc;
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int idx;
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@ -108,7 +110,7 @@ main(int argc, char **argv)
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for (idx = 0; idx < fhdr.f_nsyms; idx++)
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{
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fread(&entry, 1, SYMSZ, fp);
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fread(&entry, 1, SYMESZ, fp);
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printf("name: %c%c%c%c%c%c%c%c\n", entry.n_name[0], entry.n_name[1],entry.n_name[2],entry.n_name[3],entry.n_name[4],entry.n_name[5],entry.n_name[6],entry.n_name[7]);
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printf("\tvalue: %d\n", entry.n_value);
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printf("\tscnum: %hd\n", entry.n_scnum);
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@ -2,6 +2,7 @@
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#include <stdio.h>
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#include <time.h>
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#include <string.h>
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#include <assert.h>
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#ifndef __stupidos__
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# include <libgen.h>
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#endif
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@ -29,9 +30,9 @@ static const char *mach = NULL;
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/* */
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static int display_header = 0;
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static int display_program_header = 0;
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static int display_optional_header = 0;
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static int display_sections = 0;
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static int display_symbol_table = 0;
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static void
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usage(int retval)
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@ -64,6 +65,7 @@ main(int argc, char **argv)
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FILHDR file_header;
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AOUTHDR aout_header;
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SCNHDR section_header;
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SYMENT sym_entry;
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char name[9];
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char *type;
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FILE *fp;
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@ -82,7 +84,8 @@ main(int argc, char **argv)
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{
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case 'a':
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display_header = 1;
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display_program_header = 1;
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display_optional_header = 1;
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display_symbol_table = 1;
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display_sections = 1;
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break;
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case 'H':
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@ -169,6 +172,23 @@ main(int argc, char **argv)
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printf("[%2d] %-8s %-8s %08X %08X\n", idx, name, type, section_header.s_vaddr, section_header.s_scnptr);
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printf(" %08X\n", section_header.s_size);
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}
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printf("\n");
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}
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if (display_symbol_table)
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{
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printf("Symbol table contains %d entries:\n", file_header.f_nsyms);
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printf(" Num: Value Type Name\n");
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assert(sizeof(SYMENT) == SYMESZ);
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for (idx = 0; idx <= file_header.f_nsyms; idx++)
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{
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fseek(fp, file_header.f_symptr + (SYMESZ * idx), SEEK_SET);
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fread(&sym_entry, 1, SYMESZ, fp);
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memset(name, 0, 9);
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memcpy(name, sym_entry.n_name, 8);
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printf(" %d: %08x %hd %s\n", idx, sym_entry.n_value, sym_entry.n_type, name);
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}
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}
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return (EXIT_SUCCESS);
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@ -79,3 +79,4 @@ About: Usefull links
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- <https://wiki.osdev.org/COFF>
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- <http://www.delorie.com/djgpp/doc/coff/filhdr.html>
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- <Official Microsoft COFF Specification (2016) at https://web.archive.org/web/20230703150217/https%3A%2F%2Fdownload.microsoft.com%2Fdownload%2F9%2Fc%2F5%2F9c5b2167-8017-4bae-9fde-d599bac8184a%2Fpecoff_v83.docx>
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- <UNIX System V/386 Release 3.2 Programmer's Guide, Volume II at http://bitsavers.org/pdf/att/unix/System_V_386_Release_3.2/UNIX_System_V_386_Release_3.2_Programmers_Guide_Vol2_1989.pdf>
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172
include/coff.h
172
include/coff.h
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@ -16,7 +16,30 @@ typedef struct filehdr
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# define FILHSZ sizeof(FILHDR)
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# define F_MACH_I386 0x014c
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# define F_MACH_UNKNOWN 0x0
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# define F_MACH_AM33 0x1d3
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# define F_MACH_AMD64 0x8664
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# define F_MACH_ARM 0x1c0
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# define F_MACH_ARMNT 0x1c4
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# define F_MACH_EBC 0xebc
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# define F_MACH_I386 0x14c
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# define F_MACH_IA64 0x200
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# define F_MACH_M32R 0x9041
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# define F_MACH_MIPS16 0x266
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# define F_MACH_MIPSFPU 0x366
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# define F_MACH_MIPSFPU16 0x466
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# define F_MACH_POWERPC 0x1f0
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# define F_MACH_POWERPCFP 0x1f1
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# define F_MACH_R4000 0x166
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# define F_MACH_RISCV32 0x5032
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# define F_MACH_RISCV64 0x5064
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# define F_MACH_RISCV128 0x5128
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# define F_MACH_SH3 0x1a2
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# define F_MACH_SH3DSP 0x1a3
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# define F_MACH_SH4 0x1a6
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# define F_MACH_SH5 0x1a8
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# define F_MACH_THUMB 0x1c2
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# define F_MACH_WCEMIPSV2 0x169
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# define F_RELFLG 0x0001
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# define F_EXEC 0x0002
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@ -82,11 +105,12 @@ typedef struct reloc
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} __attribute__((packed)) RELOC;
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# define RELSZ 10
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# define R_ABS 0x000
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# define R_DIR16 0x001
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# define R_REL16 0x002
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# define R_DIR32 0x006
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# define R_PCRLONG 0x024
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# define R_ABS 0
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# define R_DIR16 01
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# define R_REL16 02
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# define R_DIR32 06
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# define R_SEG12 011
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# define R_PCRLONG 024
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typedef struct lineno
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{
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@ -99,22 +123,132 @@ typedef struct lineno
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} __attribute__((packed)) LINENO;
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# define LINESZ 6
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typedef struct sym
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{
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uint8_t n_name[8];
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int32_t n_value;
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int16_t n_scnum;
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uint16_t n_type;
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uint8_t n_sclass;
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uint8_t n_numaux;
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} __attribute__((packed)) SYM;
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# define SYMSZ 18
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# define N_UNDEF (0x0)
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# define N_ABS (-0x1)
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# define N_DEBUG (-0x2)
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# define C_EXT 0x2
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# define C_STAT 0x3
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# define C_EFCN -1 /* physical end of a function */
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# define C_NULL 0
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# define C_AUTO 1
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# define C_EXT 2 /* external symbol */
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# define C_STAT 3 /* static */
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# define C_REG 4 /* register var */
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# define C_EXTDEF 5 /* external definition */
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# define C_LABEL 6
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# define C_ULABEL 7 /* undefined label */
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# define C_MOS 8 /* member of struct */
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# define C_ARG 9
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# define C_STRTAG 10 /* struct tag */
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# define C_MOU 11 /* member of union */
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# define C_UNTAG 12 /* union tag */
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# define C_TPDEF 13 /* typedef */
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# define C_USTATIC 14
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# define C_ENTAG 15
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# define C_MOE 16
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# define C_REGPARM 17
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# define C_FIELD 18
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# define C_BLOCK 100
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# define C_FCN 101
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# define C_EOS 102
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# define C_FILE 103
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# define C_LINE 104
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# define C_ALIAS 105
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# define C_HIDDEN 106
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# define T_NULL 0
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# define T_ARG 1
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# define T_CHAR 2
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# define T_SHORT 3
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# define T_INT 4
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# define T_LONG 5
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# define T_FLOAT 6
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# define T_DOUBLE 7
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# define T_STRUCT 8
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# define T_UNION 9
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# define T_ENUM 10
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# define T_MOE 11
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# define T_UCHAR 12
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# define T_USHORT 13
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# define T_UINT 14
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# define T_ULONG 15
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# define DT_NON 0
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# define DT_PTR 1
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# define DT_FCN 2
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# define DT_ARY 3
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typedef struct syment
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{
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union
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{
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char _n_name[8]; /* symbol name */
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struct
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{
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int32_t _n_zeroes; /* symbol name */
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int32_t _n_offset; /* loc in str table */
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} _n_n;
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uint32_t _n_nptr[2];
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} _n;
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uint32_t n_value;
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int16_t n_scnum;
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uint16_t n_type;
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int8_t n_sclass;
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int8_t n_numaux;
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} __attribute__((packed)) SYMENT;
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# define SYMESZ 18
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# define n_name _n._n_name
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# define n_zeroes _n._n_n._n_zeroes
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# define n_offset _n._n_n._n_offset
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# define n_nptr _n._n_nptr[1]
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typedef union auxent
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{
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struct
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{
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int32_t x_tagndx;
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union
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{
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struct
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{
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uint16_t x_lnno;
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uint16_t x_size;
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} x_lnsz;
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int32_t x_fsize;
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} x_misc;
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union
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{
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struct
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{
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int32_t x_lnnoptr;
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int32_t x_endndx;
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} x_fcn;
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struct
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{
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uint16_t x_dimen[4];
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} x_ary;
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} x_fcnary;
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uint16_t x_tvndx;
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} x_sym;
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struct
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{
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char x_fname[14];
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} x_file;
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struct
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{
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int32_t x_scnlen;
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uint16_t x_nreloc;
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uint16_t x_nlinno;
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} x_scn;
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struct
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{
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int32_t x_tvfill;
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uint16_t x_tvlen;
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uint16_t x_tvran[2];
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} x_tv;
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} AUXENT;
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# define AUXESZ 18
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#endif /* !COFF_H */
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