>Number:         1651
>Category:       port-i386
>Synopsis:       gdb can read %fs, %gs now
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    gnats-admin (GNATS administrator)
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Oct 18 19:50:10 1995
>Last-Modified:
>Originator:     John Kohl
>Organization:
NetBSD Kernel Hackers `R` Us
>Release:        NetBSD-1.1_ALPHA (Oct 17 1995 )
>Environment:
	
System: NetBSD pattern 1.1_ALPHA NetBSD 1.1_ALPHA (PATTERN) #192: Tue Oct 17 23:54:10 EDT 1995 jtk@pattern:/u1/NetBSD-current/src/sys/arch/i386/compile/PATTERN i386


>Description:
The kernel now dumps core files with struct reg, so gdb doesn't need any
funny stuff anymore.
>How-To-Repeat:
Use gdb, notice you can't manipulate %fs, %gs
>Fix:
diff -c /usr/src/gnu/usr.bin/gdb/gdb/arch/i386/i386b-nat.c ./i386b-nat.c
*** /usr/src/gnu/usr.bin/gdb/gdb/arch/i386/i386b-nat.c	Fri Oct 13 20:23:36 1995
--- ./i386b-nat.c	Mon Aug  7 23:30:28 1995
***************
*** 31,39 ****
  #include "defs.h"
  #include "inferior.h"
  
- int tregmap[] = {tEAX, tECX, tEDX, tEBX, tESP, tEBP, tESI, tEDI,
- 		 tEIP, tEFLAGS, tCS, tSS, tDS, tES};
- 
  void
  fetch_inferior_registers (regno)
       int regno;
--- 31,36 ----
***************
*** 43,49 ****
    ptrace (PT_GETREGS, inferior_pid,
  	  (PTRACE_ARG3_TYPE) &inferior_registers, 0);
  
!   memcpy (&registers[REGISTER_BYTE (0)], &inferior_registers, 4*14);
  
    registers_fetched ();
  }
--- 40,46 ----
    ptrace (PT_GETREGS, inferior_pid,
  	  (PTRACE_ARG3_TYPE) &inferior_registers, 0);
  
!   memcpy (&registers[REGISTER_BYTE (0)], &inferior_registers, 4*NUM_REGS);
  
    registers_fetched ();
  }
***************
*** 54,60 ****
  {
    struct reg inferior_registers;
  
!   memcpy (&inferior_registers, &registers[REGISTER_BYTE (0)], 4*14);
  
    ptrace (PT_SETREGS, inferior_pid,
  	  (PTRACE_ARG3_TYPE) &inferior_registers, 0);
--- 51,57 ----
  {
    struct reg inferior_registers;
  
!   memcpy (&inferior_registers, &registers[REGISTER_BYTE (0)], 4*NUM_REGS);
  
    ptrace (PT_SETREGS, inferior_pid,
  	  (PTRACE_ARG3_TYPE) &inferior_registers, 0);
diff -c /usr/src/gnu/usr.bin/gdb/gdb/arch/i386/nm.h ./nm.h
*** /usr/src/gnu/usr.bin/gdb/gdb/arch/i386/nm.h	Fri Oct 13 20:23:36 1995
--- ./nm.h	Tue May 16 22:49:45 1995
***************
*** 39,46 ****
  
  #define	REGISTER_U_ADDR(addr, blockend, regno)				\
  {									\
!   extern int tregmap[];							\
!   addr = blockend + 4 * tregmap[regno];					\
  }
  
  #endif /* NM_I386BSD_H */
--- 39,46 ----
  
  #define	REGISTER_U_ADDR(addr, blockend, regno)				\
  {									\
!   /* kernel now dumps core with struct reg */				\
!   addr = blockend + 4 * regno;						\
  }
  
  #endif /* NM_I386BSD_H */
Only in /usr/src/gnu/usr.bin/gdb/gdb/arch/i386: tm-i386v.h
diff -c /usr/src/gnu/usr.bin/gdb/gdb/arch/i386/tm.h ./tm.h
*** /usr/src/gnu/usr.bin/gdb/gdb/arch/i386/tm.h	Fri Oct 13 20:23:37 1995
--- ./tm.h	Tue May 16 22:49:45 1995
***************
*** 28,37 ****
  
  /* Shared library code */
  #include "solib.h"
- 
- /* We can't yet read %fs and %gs. */
- #undef NUM_REGS
- #define NUM_REGS 14
  
  /* We define our own fetch and store methods. */
  #define FETCH_INFERIOR_REGISTERS
--- 28,33 ----
>Audit-Trail:
>Unformatted: