gdb-3.1

1 files changed, 112 insertions, 0 deletions

diff --git a/gdb/a.out.encap.h b/gdb/a.out.encap.h
new file mode 100644
index 0000000..8885455
--- /dev/null
+++ b/gdb/a.out.encap.h
@@ -0,0 +1,112 @@
+/*
+ * another try at encapsulating bsd object files in coff
+ * by Pace Willisson 12/9/88
+ *
+ * This time, we will only use the coff headers to tell the kernel
+ * how to exec the file.  Therefore, the only fields that need to 
+ * be filled in are the scnptr and vaddr for the text and data
+ * sections, and the vaddr for the bss.  As far as coff is concerned,
+ * there is no symbol table, relocation, or line numbers.
+ *
+ * A normal bsd header (struct exec) is placed after the coff headers,
+ * and before the real text.  I defined a the new fields 'a_machtype'
+ * and a_flags.  If a_machtype is M_386, and a_flags & A_ENCAP is
+ * true, then the bsd header is preceeded by a coff header.  Macros
+ * like N_TXTOFF and N_TXTADDR use this field to find the bsd header.
+ * 
+ * The only problem is to track down the bsd exec header.  The
+ * macros HEADER_OFFSET, etc do this.  Look at nm.c, dis.c, etc
+ * for examples.
+ */
+
+#include "a.out.gnu.h"
+
+#define N_FLAGS_COFF_ENCAPSULATE 0x20 /* coff header precedes bsd header */
+
+/* Describe the COFF header used for encapsulation.  */
+
+struct coffheader
+{
+  /* filehdr */
+  unsigned short f_magic;
+  unsigned short f_nscns;
+  long f_timdat;
+  long f_symptr;
+  long f_nsyms;
+  unsigned short f_opthdr;
+  unsigned short f_flags;
+  /* aouthdr */
+  short magic;
+  short vstamp;
+  long tsize;
+  long dsize;
+  long bsize;
+  long entry;
+  long text_start;
+  long data_start;
+  struct coffscn
+    {
+      char s_name[8];
+      long s_paddr;
+      long s_vaddr;
+      long s_size;
+      long s_scnptr;
+      long s_relptr;
+      long s_lnnoptr;
+      unsigned short s_nreloc;
+      unsigned short s_nlnno;
+      long s_flags;
+    } scns[3];
+};
+
+/* Describe some of the parameters of the encapsulation,
+   including how to find the encapsulated BSD header.  */
+
+#ifdef i386
+#define COFF_MAGIC 0514 /* I386MAGIC */
+#endif
+
+#if defined(i386)
+short __header_offset_temp;
+#define HEADER_OFFSET(f) \
+	(__header_offset_temp = 0, \
+	 fread ((char *)&__header_offset_temp, sizeof (short), 1, (f)), \
+	 fseek ((f), -sizeof (short), 1), \
+	 __header_offset_temp==COFF_MAGIC ? sizeof(struct coffheader) : 0)
+
+#define HEADER_OFFSET_FD(fd) \
+	(__header_offset_temp = 0, \
+	 read ((fd), (char *)&__header_offset_temp, sizeof (short)), \
+	 lseek ((fd), -sizeof (short), 1), \
+	 __header_offset_temp==COFF_MAGIC ? sizeof(struct coffheader) : 0)
+
+
+#else
+#define HEADER_OFFSET(f) 0
+#define HEADER_OFFSET_FD(fd) 0
+#endif
+
+#define HEADER_SEEK(f) (fseek ((f), HEADER_OFFSET((f)), 1))
+#define HEADER_SEEK_FD(fd) (lseek ((fd), HEADER_OFFSET_FD((fd)), 1))
+
+
+/* Describe the characteristics of the BSD header
+   that appears inside the encapsulation.  */
+
+#undef _N_HDROFF
+#undef N_TXTADDR
+#undef N_DATADDR
+
+#define _N_HDROFF(x) ((N_FLAGS(x) & N_FLAGS_COFF_ENCAPSULATE) ? \
+		      sizeof (struct coffheader) : 0)
+
+/* Address of text segment in memory after it is loaded.  */
+#define N_TXTADDR(x) \
+	((N_FLAGS(x) & N_FLAGS_COFF_ENCAPSULATE) ? \
+	 sizeof (struct coffheader) + sizeof (struct exec) : 0)
+
+#define SEGMENT_SIZE 0x400000
+#define N_DATADDR(x) \
+	((N_FLAGS(x) & N_FLAGS_COFF_ENCAPSULATE) ? \
+	 (SEGMENT_SIZE + ((N_TXTADDR(x)+(x).a_text-1) & ~(SEGMENT_SIZE-1))) : \
+	 (N_TXTADDR(x)+(x).a_text))