Comparing struct pt_regs : asm-i386 vs asm-x86_64

[Robert M. Stockmann]

Hi,

The (X86_64/AMD64/Opteron) platform is pretty compatible with 32 bits
software written for the ia32 architecture, so to seems.

However when going down to assembly language it breaks down to pieces :

include/asm-i386/ptrace.h :
===========================

/* this struct defines the way the registers are stored on the
   stack during a system call. */

struct pt_regs {
        long ebx;
        long ecx;
        long edx;
        long esi;
        long edi;
        long ebp;
        long eax;
        int  xds;
        int  xes;
        long orig_eax;
        long eip;
        int  xcs;
        long eflags;
        long esp;
        int  xss;
};


include/asm-x86_64/ptrace.h :
=============================

#ifndef __ASSEMBLY__

struct pt_regs {
        unsigned long r15;
        unsigned long r14;
        unsigned long r13;
        unsigned long r12;
        unsigned long rbp;
        unsigned long rbx;
/* arguments: non interrupts/non tracing syscalls only save upto here*/
        unsigned long r11;
        unsigned long r10;
        unsigned long r9;
        unsigned long r8;
        unsigned long rax;
        unsigned long rcx;
        unsigned long rdx;
        unsigned long rsi;
        unsigned long rdi;
        unsigned long orig_rax;
/* end of arguments */
/* cpu exception frame or undefined */
        unsigned long rip;
        unsigned long cs;
        unsigned long eflags;
        unsigned long rsp;
        unsigned long ss;
/* top of stack page */
};

So when porting i386 C-code (which uses the struct pt_regs from
include/asm-i386/ptrace.h) how does the pt_regs structure translate into
the struct pt_regs from include/asm-x86_64/ptrace.h  ?

Actually the software i'm referring to is the linux-abi project. Latest
patch contributions, also for kernel 2.6.7 can be found at :

http://sourceforge.net/tracker/?group_id=13130&atid=313130

regards,

Robert
-- 
Robert M. Stockmann - RHCE
Network Engineer - UNIX/Linux Specialist
crashrecovery.org  stock@xxxxxxxxxxx

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/