On Wed, Jun 04, 2003 at 04:16:48PM +0200, Maciej W. Rozycki wrote: > On Wed, 4 Jun 2003, Ralf Baechle wrote: > > > > But the need is to raise an exception after instr1 (at addr1) is executed. > > > One solution is using a break at instr2 (at addr2). > > > But suppose instr1 is a jmp then there is no point > > > in keeping a break at addr2. > > > (inorder to raise an exception after instr1 is executed). > > > > You understood correctly. Now jumps and even more so the conditional > > branches are sort of the ugly part of the whole thing. The easiest > > method is probably inserting a branch at the jump's destination address > > or in case of a branch at the branch target and the instruction following > > it's delay slot. So that's a lot of inserting and removing of > > breakpoints ... > > In a more finegrained but also more complicated example, you probably > want to insert a breakpoint in the delay slot first and at the second step > evaluate the branch's condition and put a breakpoint at the next > instruction to be executed. I'm not sure if the current version of gdb > does the first step, but it inserts a single breakpoint in the second one > only. For branch likely instructions adjust the two steps as necessary. Does that actually work reliably across MIPS processors? I don't believe that it will. I suppose you could re-execute the branch to get the delay slot executed... GDB simply executes the branch and its delay slot as a unit. -- Daniel Jacobowitz MontaVista Software Debian GNU/Linux Developer
