53 lines
1.7 KiB
Diff
53 lines
1.7 KiB
Diff
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=140532
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2007-01-01 Jan Kratochvil <jan.kratochvil@redhat.com>
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* rs6000-tdep.c (skip_prologue): Handle bl->brlr used by PIC code.
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diff -u -rup gdb-6.5-orig/gdb/rs6000-tdep.c gdb-6.5/gdb/rs6000-tdep.c
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--- gdb-6.5-orig/gdb/rs6000-tdep.c 2006-12-30 15:53:52.000000000 -0500
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+++ gdb-6.5/gdb/rs6000-tdep.c 2006-12-31 19:06:28.000000000 -0500
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@@ -1182,6 +1182,40 @@ skip_prologue (CORE_ADDR pc, CORE_ADDR l
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else if ((op & 0xfc000001) == 0x48000001)
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{ /* bl foo,
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to save fprs??? */
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+ CORE_ADDR bl_target;
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+ gdb_byte bl_target_op_buf[4];
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+
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+ /* Safely skip:
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+ prologue: ...
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+ bl addr
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+ ...
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+ addr: blrl
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+ as it could break the prologue by `prologue_sal.line'
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+ or `prologue_sal.line != this_sal.line' conditions below. */
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+ /* Sign-extend it to the upper 6 bits. */
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+ if (op & 0x02000000)
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+ bl_target = pc + -(long) (((~op) & 0x03fffffc) + 4);
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+ else
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+ bl_target = pc + (op & 0x03fffffc);
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+ if (target_read_memory (bl_target, bl_target_op_buf, 4) == 0)
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+ {
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+ unsigned long bl_target_op;
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+
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+ bl_target_op = extract_signed_integer (bl_target_op_buf, 4);
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+ if (bl_target_op == 0x4e800021) /* blrl */
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+ {
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+ /* If we did not yet retrieved LR into some GPR
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+ all our chances are lost. On the other hand already
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+ stored LR is still kept intact in its GPR. */
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+ if (lr_reg == -1)
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+ {
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+ /* Invalidate lr_reg, but don't set it to -1.
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+ That would mean that it had never been set. */
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+ lr_reg = -2;
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+ }
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+ continue;
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+ }
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+ }
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fdata->frameless = 0;
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/* Don't skip over the subroutine call if it is not within
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