PowerPC: Call of a function+8 address

[Jan Kratochvil]

Hello IBM,

[ppc64le] Setting breakpoint on function name doesn't work
https://bugzilla.redhat.com/show_bug.cgi?id=1539664

<JavaCalls::call_helper(JavaValue*, methodHandle*, JavaCallArguments*, Thread*)+2296>:
   bl <JavaCallWrapper::JavaCallWrapper+8>
=> ld r4,96(r31)

<JavaCallWrapper::JavaCallWrapper(methodHandle, Handle, JavaValue*, Thread*)>:
<JavaCallWrapper::JavaCallWrapper+0>:   addis r2,r12,101
<JavaCallWrapper::JavaCallWrapper+4>: addi  r2,r2,-20016
<JavaCallWrapper::JavaCallWrapper+8>: mflr  r0

GDB puts breakpoint on function+0 and so the breakpoint gets missed as caller
calls function+8.

in gdb-7.10:
38360086aea4f956dcd4ba406318595ea11f7dea is the first bad commit
Date:   Sun Jan 25 11:20:39 2015 +0100
    Merge GCC producer parsers. Allow digits in identifiers.

But I would call that a false positive.  Before that GDB was skipping whole
prologue (0x30 bytes).  Now GDB does not skip prologue as it is -O2 -g
optimized code.

Still GDB should skip the first 8 bytes on ppc64 but I do not know the rules
when it should be done so and whether GDB already knows about this issue
(and the pattern match failed) or not.


Thanks,
Jan Kratochvil