radare2/doc/debug.md

Conditional breakpoints

conditional breakpoints are implemented in the following way:

• when a breakpoint is hit, the condition is run as a normal command
• if the command returns a value different from zero, execution continue,
• otherwise, execution is stopped at the breakpoint

Examples of conditional breakpoints

1. ignore breakpoint at address 0x4000ce for five times:

   f times=5
   (dec_times,f times=`?vi times-1`,?= times)
   db 0x4000ce
   dbC 0x4000ce .(dec_times)
   dc
   

2. execute until rax==0x31c0 at address 0x4000ce

   e cmd.hitinfo=0
   (break_rax,f reg_rax=`dr rax`,f test=`?vi reg_rax-0x31c0`,?= test)
   db 0x4000ce
   dbC 0x4000ce .(break_rax)
   dc
   

3. perform a register tracing dump at address 0x4000ce

   e cmd.hitinfo=0
   (trace_rax,dr rax,?= 1)
   db 0x4000ce
   dbC 0x4000ce .(trace_rax)
   dc > trace.txt