Initial commit

1 files changed, 265 insertions, 0 deletions

diff --git a/unix/shlib/edsym-ssol.c b/unix/shlib/edsym-ssol.c
new file mode 100644
index 00000000..8e20c26c
--- /dev/null
+++ b/unix/shlib/edsym-ssol.c
@@ -0,0 +1,265 @@
+/* Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+ */
+
+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/file.h>
+#include <nlist.h>
+#include <libelf.h>
+
+/*
+ * EDSYM -- Edit the symbol table of a process or object module which uses
+ * the IRAF shared library.  (Sun Solaris version July94).
+ *
+ * Usage:	edsym file shimage [flags]
+ *
+ *	-d	debug: show symbol table being edited
+ *	-k	keep: do not omit "uninteresting" symbols
+ *	-n	noact: do not modify any files
+ *	-t	delete symbols pointing into transfer vector
+ *	-T	delete all shared image symbols, keeping only client symbols
+ */
+
+
+#define	VHDRSIZE	0x1c
+#define	v_end		vec[4]
+#define	IS_TVECT(a)	((a)>=(vshlib+VHDRSIZE)&&(a)<vshend)
+#define	max(a,b)	(((a)>=(b))?(a):(b))
+
+static	int debug = 0;			/* print symbol table */
+static	int noact = 0;			/* do not modify any files */
+static	int omit_tv = 0;		/* omit transfer vector symbols */
+static	int omit_shsym = 0;		/* omit all shlib symbols */
+static	int keep_sym = 0;		/* do not omit uninteresting symbols */
+
+extern	char *malloc();
+
+
+/* EDSYM -- Edit the symbol table of a process which uses the IRAF shared
+ * library.  For each symbol found which points to a location in the shared
+ * library transfer vector, add a V prefix to the symbol name, and add a
+ * symbol with the old name pointing to the actual function in the shared
+ * image.  This is desirable before runtime debugging of processes linked
+ * with the shared library.
+ */
+main (argc, argv)
+int argc;
+char *argv[];
+{
+        register Elf32_Phdr *phdr;
+        register Elf32_Ehdr *ehdr;
+        register Elf32_Shdr *shdr;
+	register Elf32_Sym *sym;
+	unsigned vshlib, vshend, vsize;
+	char *fname, *shlib, *buf, *ip, *op;
+	int version, fd, fd_sh, nsyms, arg;
+	char *out, shpath[256];
+	int offset, nbytes;
+	struct nlist nl[3];
+	unsigned ushlib[8];
+	unsigned *vec, *epa;
+        Elf *elf, *elf_sh;
+        Elf_Scn *scn;
+
+	/* Process arguments.  This version of edsym does not support all of
+	 * the following arguments.
+	 */
+	if (argc < 3) {
+	    fprintf (stderr, "Usage: edsym <file> <shlib> [-dkntT]\n");
+	    exit (0);
+	} else {
+	    fname = argv[1];
+	    shlib = argv[2];
+	    for (arg=3;  arg < argc;  arg++) {
+		if (argv[arg][0] != '-')
+		    continue;
+		for (ip=argv[arg]+1;  *ip;  ip++) {
+		    switch (*ip) {
+		    case 'd':		/* print symbols */
+			debug++;
+			break;
+		    case 'k':		/* do not omit uninteresting symbols */
+			keep_sym++;
+			break;
+		    case 'n':		/* do not edit object file */
+			noact++;
+			break;
+		    case 't':		/* omit transfer vector symbols */
+			omit_tv++;
+			break;
+		    case 'T':		/* omit all shlib symbols */
+			omit_shsym++;
+			break;
+		    default:
+			fprintf (stderr, "edsym: unknown switch -%c\n", *ip);
+		    }
+		}
+	    }
+		
+	}
+
+	/* Open the file to be edited. */
+	if ((fd = open (fname, 2)) < 0) {
+	    fprintf (stderr, "edsym: cannot open file %s\n", fname);
+	    exit (1);
+	}
+
+	elf_version (EV_CURRENT);
+	elf = elf_begin (fd, ELF_C_READ, NULL);
+	if (!elf) {
+	    fprintf (stderr, "edsym: not an ELF format executable\n");
+	    exit (2);
+	}
+
+	/* Read file header.  */
+	ehdr = elf32_getehdr (elf);
+	if (!ehdr) {
+	    fprintf (stderr, "edsym: cannot read file header\n");
+	    exit (3);
+	}
+
+	/* Read program header for text segment, which we assume to be the
+	 * first loadable program segment.
+	 */
+	phdr = elf32_getphdr (elf);
+	if (ehdr->e_phnum <= 0 || !phdr) {
+	    printf ("cannot read program header\n");
+	    exit (4);
+	}
+
+	/* Get the ushlib vector from the file being edited.
+	 */
+	nl[0].n_name = "ushlib_";
+	nl[1].n_name = NULL;
+	if (nlist (fname, nl) != 0) {
+	    fprintf (stderr, "cannot read name list from %s\n", fname);
+	    exit (4);
+	}
+
+	offset = (unsigned)nl[0].n_value - phdr->p_vaddr + phdr->p_offset;
+	lseek (fd, offset, L_SET);
+	if (read (fd, (char *)ushlib, sizeof(ushlib)) != sizeof(ushlib)) {
+	    fprintf (stderr, "cannot read shared image %s\n", fname);
+	    exit (9);
+	}
+
+	version = ushlib[0];
+	vshlib = ushlib[2];
+	vshend = ushlib[3];
+	vsize = vshend - vshlib;
+
+	/* Read transfer vector from shared image.
+	 */
+
+	/* Use the correct version of the shared image. */
+	for (ip=shlib, out=op=shpath;  *op = *ip++;  op++)
+	    if (*op == '/')
+		out = op + 1;
+	if (strcmp (out, "S.e") == 0) {
+	    sprintf (out, "S%d.e", version);
+	    shlib = shpath;
+	}
+
+	/* Open the file to be edited. */
+	if ((fd_sh = open (shlib, 0)) < 0) {
+	    fprintf (stderr, "edsym: cannot open file %s\n", shlib);
+	    exit (1);
+	}
+
+	elf_sh = elf_begin (fd_sh, ELF_C_READ, NULL);
+	if (!elf_sh) {
+	    fprintf (stderr, "edsym: not an ELF format executable\n");
+	    exit (2);
+	}
+
+	/* Read file header.  */
+	ehdr = elf32_getehdr (elf_sh);
+	if (!ehdr) {
+	    fprintf (stderr, "edsym: cannot read file header\n");
+	    exit (3);
+	}
+
+	/* Read program header for text segment, which we assume to be the
+	 * first loadable program segment.
+	 */
+	phdr = elf32_getphdr (elf_sh);
+	if (ehdr->e_phnum <= 0 || !phdr) {
+	    printf ("cannot read program header\n");
+	    exit (4);
+	}
+
+	if (!(vec = (unsigned *) malloc (vsize))) {
+	    fprintf (stderr, "out of memory\n");
+	    exit (10);
+	}
+	offset = vshlib - phdr->p_vaddr + phdr->p_offset;
+	lseek (fd_sh, offset, L_SET);
+	if (read (fd_sh, vec, vsize) != vsize) {
+	    fprintf (stderr,
+		"cannot read transfer vector from %s\n", shlib);
+	    exit (11);
+	}
+
+	/* Locate symbol table section in file to be edited. */
+	scn = NULL;
+	while (scn = elf_nextscn(elf,scn)) {
+	    shdr = elf32_getshdr (scn);
+	    if (shdr->sh_type == SHT_SYMTAB)
+		break;
+	}
+	if (!scn) {
+	    fprintf (stderr, "edsym: file %s has no symbol table\n", fname);
+	    exit (12);
+	}
+
+	/* Read symbol table into memory. */
+	nbytes = shdr->sh_size;
+	nsyms = nbytes / sizeof(Elf32_Sym);
+	if (!(buf = (char *) malloc (nbytes))) {
+	    fprintf (stderr, "edsym: out of memory\n");
+	    exit (13);
+	}
+	lseek (fd, shdr->sh_offset, 0);
+	if (read (fd, buf, nbytes) != nbytes) {
+	    fprintf (stderr, "edsym: cannot read symbol table\n");
+	    exit (14);
+	}
+
+	/* Now edit the symbol table of the object file.
+	 */
+	for (sym = (Elf32_Sym *)buf;  --nsyms >= 0;  sym++) {
+	    Elf32_Addr v = sym->st_value;
+	    if (debug) {
+		printf ("name=%d value=0x%x size=0x%x info=%o shndx=%d",
+		    sym->st_name, sym->st_value, sym->st_size,
+		    sym->st_info, sym->st_shndx);
+	    }
+	    if (sym->st_size == 0 &&
+		    ELF32_ST_BIND(sym->st_info) == STB_GLOBAL && IS_TVECT(v)) {
+		epa = (unsigned *)((char *)vec + (v - vshlib));
+		v = (((*epa & 0x3fffff) << 10) | (*(epa+1) & 0x3ff));
+		if (debug)
+		    printf ("\t%x -> %x", sym->st_value, v);
+		sym->st_value = (Elf32_Addr) v;
+	    }
+	    if (debug)
+		printf ("\n");
+	}
+
+	/* Write out the edited symbol table. */
+	lseek (fd, shdr->sh_offset, 0);
+	if (write (fd, buf, nbytes) != nbytes) {
+	    fprintf (stderr, "edsym: cannot update symbol table\n");
+	    exit (7);
+	}
+
+	/* All done. */
+	free (buf);
+	free ((char *)vec);
+	elf_end (elf_sh);
+	close (fd_sh);
+	elf_end (elf);
+	close (fd);
+
+	exit (0);
+}