From fa080de7afc95aa1c19a6e6fc0e0708ced2eadc4 Mon Sep 17 00:00:00 2001
From: Joseph Hunkeler <jhunkeler@gmail.com>
Date: Wed, 8 Jul 2015 20:46:52 -0400
Subject: Initial commit

---
 unix/shlib/elf.c | 96 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 96 insertions(+)
 create mode 100644 unix/shlib/elf.c

(limited to 'unix/shlib/elf.c')

diff --git a/unix/shlib/elf.c b/unix/shlib/elf.c
new file mode 100644
index 00000000..31c18891
--- /dev/null
+++ b/unix/shlib/elf.c
@@ -0,0 +1,96 @@
+#include <libelf.h>
+
+/*
+ * ELF -- Test program to access an ELF format file (executable).
+ */
+main (argc,argv)
+int argc;
+char **argv;
+{
+	register Elf32_Phdr *phdr;
+	register Elf32_Ehdr *ehdr;
+	register Elf32_Shdr *shdr;
+	Elf32_Phdr *phdr_array;
+	int phnum, fd, i;
+	char strbuf[512];
+	Elf_Scn *scn;
+	Elf *elf;
+
+	elf_version (EV_CURRENT);
+
+	fd = open (argv[1], 2);
+	if (fd < 0) {
+	    printf ("cannot open file\n");
+	    exit (1);
+	}
+	elf = elf_begin (fd, ELF_C_READ, NULL);
+	if (!elf) {
+	    printf ("not an ELF format file\n");
+	    exit (2);
+	}
+
+	/* Read and print file header.
+	 */
+	ehdr = elf32_getehdr (elf);
+	if (!ehdr) {
+	    printf ("cannot read file header\n");
+	    exit (3);
+	}
+	printf ("File type=%d machine=%d version=%d shnum=%d phnum=%d\n",
+	    ehdr->e_type, 
+	    ehdr->e_machine,
+	    ehdr->e_version,
+	    ehdr->e_shnum,
+	    phnum = ehdr->e_phnum);
+	printf ("--------------------------------------------------------\n");
+
+	/* Read and print program header.
+	 */
+	phdr_array = elf32_getphdr (elf);
+	if (phnum <= 0 || !phdr_array) {
+	    printf ("cannot read program header\n");
+	} else {
+	    for (i=0;  i < phnum;  i++) {
+		phdr = (Elf32_Phdr *)
+		    ((char *)phdr_array + i*ehdr->e_phentsize);
+		printf ("type=%d offset=%d",
+		    phdr->p_type, 
+		    phdr->p_offset);
+		printf (" vaddr=0x%x fsize=0x%x msize=0x%x align=0x%x\n",
+		    phdr->p_vaddr, 
+		    phdr->p_filesz, 
+		    phdr->p_memsz,
+		    phdr->p_align); 
+	    }
+	}
+	printf ("--------------------------------------------------------\n");
+
+	/* Summarize files sections.
+	 */
+
+	/* Get section header string buffer. */
+	scn = elf_getscn (elf, ehdr->e_shstrndx);
+	shdr = elf32_getshdr (scn);
+	if (!scn || !shdr)
+	    goto nosec;
+	lseek (fd, (long)shdr->sh_offset, 0);
+	if (read (fd, strbuf, sizeof(strbuf)) < sizeof(strbuf)) {
+nosec:	    printf ("cannot read section header\n");
+	    exit (4);
+	}
+
+	/* Print section headers. */
+	scn = NULL;
+	while (scn = elf_nextscn(elf,scn)) {
+	    shdr = elf32_getshdr (scn);
+	    printf ("type=%d addr=0x%x offset=0x%x size=0x%x  %s\n",
+		shdr->sh_type,
+		shdr->sh_addr,
+		shdr->sh_offset,
+		shdr->sh_size,
+		strbuf + shdr->sh_name);
+	}
+
+	elf_end (elf);
+	close (fd);
+}
-- 
cgit