tree 8de2eba6adaa8ec7ce1e21fac5cb059742962ed7
parent 05d63bafad71b534c041275831489f3e0dedcf3f
author Indu Bhagat <indu.bhagat@oracle.com> 1686334445 -0700
committer Indu Bhagat <indu.bhagat@oracle.com> 1686334445 -0700

libsframe: fix sframe_find_fre for pltN entries

To find SFrame stack trace information from an FDE of type
SFRAME_FDE_TYPE_PCMASK, sframe_find_fre () was doing an operation
like,
  (start_ip_offset & 0xff) >= (pc & 0xff), etc.

This is buggy and needs correction.  The mask 0xff should be 0xf (to
work for a pltN entry of size say, 16 bytes).

At this time, the size of the pltN entry is implicitly assumed to be 16
bytes by libsframe.  In next version of the SFrame format, we can encode
this information explicitly in the SFrame FDE.

For now, we should fix the code to at least behave correctly for the
generated code and the generated SFrame stack trace information for the
pltN entries on x86_64.

libsframe/
	* sframe.c (sframe_find_fre): Correct the bitmask used for
	SFrame FDEs of type SFRAME_FDE_TYPE_PCMASK.