10-05-2015
Quote:
The first big one was the abandon of PA-RISC...
I find this statement really odd. The reason why people liked RISC chips is because, at one point, they had faster clock speeds that CISC chips. However, since then CISC chips have become significantly faster, run at a higher clock frequency and can do more with each clock cycle. Hence anything RISC is in the past.
I worked in the VAX/Alpha world 20 years ago. That architecture was dying then, and is now all but dead. There is still a local steel mill that uses Alpha processors. But they only use it because they haven't yet rewritten all their old Cobol and Fortran.
I get the argument that cloud computing means fewer tech jobs. But companies will still want some knowledge in house. But maybe not forever.
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LEARN ABOUT ULTRIX
filehdr
filehdr(5) File Formats Manual filehdr(5)
Name
filehdr - file header for RISC object files
Syntax
#include < filehdr.h>
Description
Every RISC object file begins with a 20-byte header. The following C struct declaration is used:
struct filehdr
{
unsigned short f_magic; /* magic number */
unsigned short f_nscns; /* number of sections */
long f_timdat; /* time & date stamp */
long f_symptr; /* file pointer to symbolic header */
long f_nsyms; /* sizeof(symbolic header) */
unsigned short f_opthdr; /* sizeof(optional header) */
unsigned short f_flags; /* flags */
};
The byte offset into the file at which the symbolic header can be found is f_symptr. Its value can be used as the offset in to position an
I/O stream to the symbolic header. The ULTRIX system optional header is 56 bytes. The valid magic numbers are given below:
#define MIPSEBMAGIC 0x0160 /* objects for big-endian machines */
#define MIPSELMAGIC 0x0162 /* objects for little-endian machines */
#define MIPSEBUMAGIC 0x0180 /* ucode objects for big-endian machines */
#define MIPSELUMAGIC 0x0182 /* ucode objects for little-endian machines */
RISC object files can be loaded and examined on machines differing from the object's target byte sex. Therefore, for object file magic
numbers, the byte-swapped values have define constants associated with them:
#define SMIPSEBMAGIC 0x6001
#define SMIPSELMAGIC 0x6201
The value in f_timdat is obtained from the system call. Flag bits used in RISC objects are:
#define F_RELFLG 0000001 /* relocation entries stripped */
#define F_EXEC 0000002 /* file is executable */
#define F_LNNO 0000004 /* line numbers stripped */
#define F_LSYMS 0000010 /* local symbols stripped */
See Also
time(2), fseek(3s), a.out(5)
RISC filehdr(5)