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Re: [Qemu-devel] [PATCH 01/02] fix issue where a branch to pc+4 confuses


From: Steven Seeger
Subject: Re: [Qemu-devel] [PATCH 01/02] fix issue where a branch to pc+4 confuses GDB because pc and npc are set to the same value
Date: Thu, 15 Feb 2018 16:06:03 -0500

Oh, let me also add that this assertion fails in gdb: 

Thread 1 hit Breakpoint 3, 0x40f102d8 in ?? ()
(gdb) si
./../../src/gdb-8.1/gdb/sparc-tdep.c:1737: internal-error: std::vector<long 
unsigned int> sparc_software_single_step(regcache*): Assertion
`nnpc != npc || orig_npc == 0' failed.

I had this assertion commented out so when I unrolled my patch to repeat the 
test in order to write my previous reply to you, I saw it be stuck on the same 
instruction rather than fail this assertion.

I guess this could be a gdb bug, too.

Steven





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