mirror of
https://github.com/ioacademy-jikim/debugging
synced 2025-06-07 07:56:19 +00:00
83 lines
2.1 KiB
C
83 lines
2.1 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <elf.h>
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#include <sys/procfs.h>
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#include <asm/ldt.h>
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static void * read_note(void *addr, void **pdata)
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{
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#define ALIGN(pos, size) ((((pos) + (size-1)) / size) * size)
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Elf32_Nhdr *note_hdr = addr;
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/* print note name and type */
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printf("note: %-8s (0x%03x)\n", (char *)(note_hdr+1), note_hdr->n_type);
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/* calculate data position */
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*pdata = (void *) ((unsigned long) (note_hdr+1) + ALIGN(note_hdr->n_namesz, 4));
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/* return pointer of next note header */
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return (void *) ((unsigned long) *pdata + ALIGN(note_hdr->n_descsz, 4));
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}
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int main(void)
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{
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prstatus_t *status;
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prpsinfo_t *psinfo;
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struct elf_siginfo *siginfo;
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Elf32_auxv_t *auxv;
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struct user_desc *ldt;
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void *files;
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FILE *fp;
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Elf32_Ehdr elf_hdr;
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Elf32_Phdr pgrm_hdr;
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char buf[4096];
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void *note;
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fp = fopen("core", "r");
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/* read ELF header */
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fread(&elf_hdr, sizeof(elf_hdr), 1, fp);
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/* seek to first program header (for NOTE) */
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fseek(fp, elf_hdr.e_phoff, SEEK_SET);
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/* read program header */
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fread(&pgrm_hdr, sizeof(pgrm_hdr), 1, fp);
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/* seek to note */
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fseek(fp, pgrm_hdr.p_offset, SEEK_SET);
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fread(buf, pgrm_hdr.p_filesz, 1, fp);
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note = buf;
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note = read_note(note, (void **) &status);
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note = read_note(note, (void **) &psinfo);
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note = read_note(note, (void **) &siginfo);
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note = read_note(note, (void **) &auxv);
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note = read_note(note, (void **) &files);
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note = read_note(note, (void **) &ldt);
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#define EAX 6
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#define EIP 12
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printf("program name = %s\n", psinfo->pr_fname);
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printf("signo = %d\n", status->pr_info.si_signo);
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printf("EIP = 0x%08lx\nEAX = 0x%08lx\n", status->pr_reg[EIP], status->pr_reg[EAX]);
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/* print auxiliary vector */
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for ( ; auxv->a_type != AT_NULL; auxv++) {
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if (auxv->a_type == AT_BASE)
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printf("address of dynamic loader: %p\n", (void *) auxv->a_un.a_val);
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if (auxv->a_type == AT_SYSINFO_EHDR)
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printf("address of vdso: %p\n", (void *) auxv->a_un.a_val);
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}
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printf("gdt entry: %u, base: 0x%08x, limit: 0x%08lx\n",
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ldt->entry_number, ldt->base_addr & ~0xfff,
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ldt->limit_in_pages ? ldt->limit * PAGE_SIZE : ldt->limit);
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return 0;
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}
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