Bug 3562

Summary: single-step sigreturn when trapped instruction is a breakpoint
Product: frysk Reporter: Andrew Cagney <cagney>
Component: generalAssignee: Unassigned <frysk-bugzilla>
Status: NEW ---    
Severity: normal    
Priority: P2    
Version: unspecified   
Target Milestone: ---   
Host: Target:
Build: Last reconfirmed:
Bug Depends on:    
Bug Blocks: 1521, 1522    

Description Andrew Cagney 2006-11-22 17:22:14 UTC
Check that single stepping the sig-return instruction, returning to the trapped
instruction in the callee, where that trapped instruction has been replaced by a
breakpoint, triggers bith the code and instruction observers, and doesn't go one
instruction too far.
Comment 1 Mark Wielaard 2007-02-13 13:31:24 UTC
Most of this is tested by the testStepping* variants in TestBreakpoints,
counters on both Instruction and Code observers are observed. An explicit test
could be added for "doesn't go one instruction too far".
Comment 2 Andrew Cagney 2007-02-15 14:26:20 UTC
Checking is is very important, kernel and code bugs if encountered in the past
have exibited exactly those edge case problems - executing the instruction,
continuing, ...