[xtensa-cvscommit] linux/arch/xtensa/kernel ptrace.c,1.2,1.3 gdb-stub.c,1.4,1.5

[<sfo...@us...>]

Update of /cvsroot/xtensa/linux/arch/xtensa/kernel
In directory usw-pr-cvs1:/tmp/cvs-serv28814

Modified Files:
	ptrace.c gdb-stub.c 
Log Message:
The panes of AR registers are stored in the reverse order of which I thought in the save area on user exceptions.  Fix the algorithm to find saved AR registers accordingly.  This improves backtracing with gdb markedly.



Index: ptrace.c
===================================================================
RCS file: /cvsroot/xtensa/linux/arch/xtensa/kernel/ptrace.c,v
retrieving revision 1.2
retrieving revision 1.3
diff -C2 -d -r1.2 -r1.3
*** ptrace.c	19 Sep 2002 07:06:12 -0000	1.2
--- ptrace.c	23 Sep 2002 19:20:20 -0000	1.3
***************
*** 147,154 ****
  			}
  			else if(a_reg >= first_pane*4) {
! 				if(first_pane < 0)
! 					res = -EIO;
! 				else
! 					tmp = child->thread.regfile[a_reg - first_pane*4];
  			}
  			else {
--- 147,163 ----
  			}
  			else if(a_reg >= first_pane*4) {
! 			    if(first_pane < 0)
! 				res = -EIO;
! 			    else {
! 				/* Calculate pane of saved registers.
! 				 * first_pane also corresponds to the number of
! 				 * INactive panes, so num_aregs/4 - first_pane
! 				 * is the number of active panes.  The highest
! 				 * active pane is is stored in the lowest part
! 				 * of the regfile array.  */
! 				tmp = XCHAL_NUM_AREGS / 4 - first_pane -
! 					(a_reg / 4 - first_pane) - 1;
! 				tmp = child->thread.regfile[tmp*4 + a_reg % 4];
! 			    }
  			}
  			else {

Index: gdb-stub.c
===================================================================
RCS file: /cvsroot/xtensa/linux/arch/xtensa/kernel/gdb-stub.c,v
retrieving revision 1.4
retrieving revision 1.5
diff -C2 -d -r1.4 -r1.5
*** gdb-stub.c	22 Sep 2002 21:46:48 -0000	1.4
--- gdb-stub.c	23 Sep 2002 19:20:20 -0000	1.5
***************
*** 386,389 ****
--- 386,390 ----
  	int ar_reg, a_reg, first_pane;
  	extern int find_first_pane(int, int);
+ 	int temp;
  
  	kernel_single_step = 0;
***************
*** 575,580 ****
  				    if (first_pane < 0)
  					strcpy(output_buffer, "E01");
! 				    else
! 					mem2hex((char *)&(current->thread.regfile[a_reg - first_pane*4]), output_buffer, 4, 0);
  				}
  				else {
--- 576,590 ----
  				    if (first_pane < 0)
  					strcpy(output_buffer, "E01");
! 				    else {
! 				/* Calculate pane of saved registers.
! 				 * first_pane also corresponds to the number of
! 				 * INactive panes, so num_aregs/4 - first_pane
! 		 		 * is the number of active panes.  The highest
! 				 * active pane is is stored in the lowest part
! 				 * of the regfile array.  */
! 					temp = XCHAL_NUM_AREGS / 4 - first_pane
! 						- (a_reg / 4 - first_pane) - 1;
! 					mem2hex((char *)&(current->thread.regfile[temp * 4 + a_reg % 4]), output_buffer, 4, 0);
! 				    }
  				}
  				else {