Attachment 144612 Details for Bug 140532 – non-PIC unwinding fix

[patch] non-PIC unwinding fix

gdb-6.3-bz140532-ppcnoncfi-skip_prologue-PIC.patch (text/plain), 1.62 KB, created by Jan Kratochvil on 2007-01-01 21:14:50 UTC

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Creator: Jan Kratochvil

Created: 2007-01-01 21:14:50 UTC

Size: 1.62 KB

patch

obsolete

>2007-01-01  Jan Kratochvil <jan.kratochvil@redhat.com>
>
>	* rs6000-tdep.c (skip_prologue): Handle bl->brlr used by PIC code.
>
>diff -u -rup gdb-6.5-orig/gdb/rs6000-tdep.c gdb-6.5/gdb/rs6000-tdep.c
>--- gdb-6.5-orig/gdb/rs6000-tdep.c	2006-12-30 15:53:52.000000000 -0500
>+++ gdb-6.5/gdb/rs6000-tdep.c	2006-12-31 19:06:28.000000000 -0500
>@@ -1182,6 +1182,40 @@ skip_prologue (CORE_ADDR pc, CORE_ADDR l
>       else if ((op & 0xfc000001) == 0x48000001)
> 	{			/* bl foo, 
> 				   to save fprs??? */
>+	  CORE_ADDR bl_target;
>+	  gdb_byte bl_target_op_buf[4];
>+
>+	  /* Safely skip:
>+	     prologue: ...
>+		       bl addr
>+		       ...
>+	     addr:     blrl
>+	     as it could break the prologue by `prologue_sal.line'
>+	     or `prologue_sal.line != this_sal.line' conditions below.  */
>+	  /* Sign-extend it to the upper 6 bits.  */
>+	  if (op & 0x02000000)
>+	    bl_target = pc + -(long) (((~op) & 0x03fffffc) + 4);
>+	  else
>+	    bl_target = pc + (op & 0x03fffffc);
>+	  if (target_read_memory (bl_target, bl_target_op_buf, 4) == 0)
>+	    {
>+	      unsigned long bl_target_op;
>+
>+	      bl_target_op = extract_signed_integer (bl_target_op_buf, 4);
>+	      if (bl_target_op == 0x4e800021)	/* blrl  */
>+		{
>+		  /* If we did not yet retrieved LR into some GPR
>+		     all our chances are lost.  On the other hand already
>+		     stored LR is still kept intact in its GPR.  */
>+		  if (lr_reg == -1)
>+		    {
>+		      /* Invalidate lr_reg, but don't set it to -1.
>+			 That would mean that it had never been set.  */
>+		      lr_reg = -2;
>+		    }
>+		  continue;
>+		}
>+	    }
> 
> 	  fdata->frameless = 0;
> 	  /* Don't skip over the subroutine call if it is not within

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Attachments on bug 140532: 144612 | 144613 | 145505 | 145506 | 145513 | 230151