paul@frank:~/dev/pcsx_rearmed$ gdb-multiarch 
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(gdb) file ./pcsx
Reading symbols from ./pcsx...

(gdb) set architecture powerpc:750
The target architecture is set to "powerpc:750".

(gdb) set sysroot ~/dev/toolchains/powerpc/powerpc-buildroot-linux-gnu/sysroot/

(gdb) set can-use-hw-watchpoints 0

(gdb) target remote /tmp/foo
Remote debugging using /tmp/foo
Reading symbols from /home/paul/dev/toolchains/powerpc/powerpc-buildroot-linux-gnu/sysroot/lib/ld.so.1...
0x3f7da5cc in _start () from /home/paul/dev/toolchains/powerpc/powerpc-buildroot-linux-gnu/sysroot/lib/ld.so.1

(gdb) c
Continuing.
warning: Could not load shared library symbols for 2 libraries, e.g. /home/paul/dev/toolchains/powerpc/powerpc-buildroot-linux-gnu/sysroot/usr/lib/libopcodes-2.38.so.
Use the "info sharedlibrary" command to see the complete listing.
Do you need "set solib-search-path" or "set sysroot"?
warning: File "/home/paul/dev/toolchains/powerpc/powerpc-buildroot-linux-gnu/sysroot/usr/lib/libstdc++.so.6.0.30-gdb.py" auto-loading has been declined by your `auto-load safe-path' set to "$debugdir:$datadir/auto-load".
To enable execution of this file add
	add-auto-load-safe-path /home/paul/dev/toolchains/powerpc/powerpc-buildroot-linux-gnu/sysroot/usr/lib/libstdc++.so.6.0.30-gdb.py
line to your configuration file "/home/paul/.config/gdb/gdbinit".
To completely disable this security protection add
	set auto-load safe-path /
line to your configuration file "/home/paul/.config/gdb/gdbinit".
For more information about this security protection see the
"Auto-loading safe path" section in the GDB manual.  E.g., run from the shell:
	info "(gdb)Auto-loading safe path"
[New Thread 1.7571]
[New Thread 1.7572]

Thread 1 received signal SIGILL, Illegal instruction.
0x3f72d188 in CPU_haveAltiVec () from /home/paul/dev/toolchains/powerpc/powerpc-buildroot-linux-gnu/sysroot/usr/lib/libSDL-1.2.so.0

(gdb) b lightrec_start_debugger
Breakpoint 1 at 0x3f61078c: lightrec_start_debugger. (2 locations)

(gdb) c
Continuing.

Thread 1 hit Breakpoint 1, lightrec_start_debugger () at /home/paul/dev/lightrec/lightrec.c:1337
1337		pr_err("Starting debugger!\n");

(gdb) b _split_branches
Breakpoint 2 at 0x3f5b1b38: file lightning.c, line 2640.

(gdb) c
Continuing.

Thread 1 hit Breakpoint 2, 0x3f5b1b38 in _split_branches (_jit=<optimized out>) at lightning.c:2640
2640	    for (node = _jitc->head; node; node = next) {
(gdb) bt
#0  0x3f5b1b38 in _split_branches (_jit=<optimized out>) at lightning.c:2640
#1  _jit_optimize (_jit=_jit@entry=0x40319ff0) at lightning.c:1618
#2  0x3f5b27e0 in _jit_realize (_jit=_jit@entry=0x40319ff0) at lightning.c:1876
#3  0x3f610b70 in lightrec_emit_code (state=0x38c7f010, block=0x40319fc0, size=0x40319fe0, _jit=0x40319ff0) at /home/paul/dev/lightrec/lightrec.c:766
#4  lightrec_compile_block (cstate=0x402d7180, block=block@entry=0x40319fc0) at /home/paul/dev/lightrec/lightrec.c:1438
#5  0x3f612b1c in get_next_block_func (state=0x38c7f010, pc=2148049324) at /home/paul/dev/lightrec/lightrec.c:690
#6  0x38c7e124 in ?? ()
#7  0x3f612bf4 in lightrec_execute (state=0x3fffe9b0, pc=<optimized out>, target_cycle=<optimized out>) at /home/paul/dev/lightrec/lightrec.c:1595
#8  0x400416c8 in lightrec_plugin_execute_block () at libpcsxcore/lightrec/plugin.c:468
#9  0x40041e8c in lightrec_plugin_execute () at libpcsxcore/lightrec/plugin.c:510
#10 0x4000f114 in main (argc=3, argv=0x3ffff004) at frontend/main.c:690

(gdb) p &((jit_state_t *)0x40319ff0)->comp->blocks.ptr[2].reglive
$2 = (jit_regset_t *) 0x403188d8

(gdb) watch *$2
Watchpoint 3: *$2

(gdb) c
Continuing.

Thread 1 hit Watchpoint 3: *$2

Old value = 0
New value = 32
_jit_setup (block=0x403188d0, _jit=0x40319ff0) at lightning.c:2214
2214			if (value & jit_cc_a0_reg) {

(gdb) bt
#0  _jit_setup (block=0x403188d0, _jit=0x40319ff0) at lightning.c:2214
#1  _jit_optimize (_jit=_jit@entry=0x40319ff0) at lightning.c:1627
#2  0x3f5b27e0 in _jit_realize (_jit=_jit@entry=0x40319ff0) at lightning.c:1876
#3  0x3f610b70 in lightrec_emit_code (state=0x38c7f010, block=0x40319fc0, size=0x40319fe0, _jit=0x40319ff0) at /home/paul/dev/lightrec/lightrec.c:766
#4  lightrec_compile_block (cstate=0x402d7180, block=block@entry=0x40319fc0) at /home/paul/dev/lightrec/lightrec.c:1438
#5  0x3f612b1c in get_next_block_func (state=0x38c7f010, pc=2148049324) at /home/paul/dev/lightrec/lightrec.c:690
#6  0x38c7e124 in ?? ()
#7  0x3f612bf4 in lightrec_execute (state=0x3fffe9b0, pc=<optimized out>, target_cycle=<optimized out>) at /home/paul/dev/lightrec/lightrec.c:1595
#8  0x400416c8 in lightrec_plugin_execute_block () at libpcsxcore/lightrec/plugin.c:468
#9  0x40041e8c in lightrec_plugin_execute () at libpcsxcore/lightrec/plugin.c:510
#10 0x4000f114 in main (argc=3, argv=0x3ffff004) at frontend/main.c:690

(gdb) c
Continuing.

Thread 1 hit Watchpoint 3: *$2

Old value = 32
New value = 16777248
_jit_setup (block=0x403188d0, _jit=0x40319ff0) at lightning.c:2214
2214			if (value & jit_cc_a0_reg) {

(gdb) p/t *$2 & (1 << 17)
$5 = 0

(gdb) bt
#0  _jit_setup (block=0x403188d0, _jit=0x40319ff0) at lightning.c:2214
#1  _jit_optimize (_jit=_jit@entry=0x40319ff0) at lightning.c:1627
#2  0x3f5b27e0 in _jit_realize (_jit=_jit@entry=0x40319ff0) at lightning.c:1876
#3  0x3f610b70 in lightrec_emit_code (state=0x38c7f010, block=0x40319fc0, size=0x40319fe0, _jit=0x40319ff0) at /home/paul/dev/lightrec/lightrec.c:766
#4  lightrec_compile_block (cstate=0x402d7180, block=block@entry=0x40319fc0) at /home/paul/dev/lightrec/lightrec.c:1438
#5  0x3f612b1c in get_next_block_func (state=0x38c7f010, pc=2148049324) at /home/paul/dev/lightrec/lightrec.c:690
#6  0x38c7e124 in ?? ()
#7  0x3f612bf4 in lightrec_execute (state=0x3fffe9b0, pc=<optimized out>, target_cycle=<optimized out>) at /home/paul/dev/lightrec/lightrec.c:1595
#8  0x400416c8 in lightrec_plugin_execute_block () at libpcsxcore/lightrec/plugin.c:468
#9  0x40041e8c in lightrec_plugin_execute () at libpcsxcore/lightrec/plugin.c:510
#10 0x4000f114 in main (argc=3, argv=0x3ffff004) at frontend/main.c:690

(gdb) c
Continuing.

Thread 1 hit Watchpoint 3: *$2

Old value = 16777248
New value = 2251791240527904
0x3f5b0d78 in _jit_follow (todo=<synthetic pointer>, block=0x403188d0, _jit=0x40319ff0) at lightning.c:2276
2276			    jit_regset_and(&block->regmask, &block->regmask, &regtemp);

(gdb) p/t *$2 & (1 << 17)
$6 = 0

(gdb) bt
#0  0x3f5b0d78 in _jit_follow (todo=<synthetic pointer>, block=0x403188d0, _jit=0x40319ff0) at lightning.c:2276
#1  _jit_optimize (_jit=_jit@entry=0x40319ff0) at lightning.c:1639
#2  0x3f5b27e0 in _jit_realize (_jit=_jit@entry=0x40319ff0) at lightning.c:1876
#3  0x3f610b70 in lightrec_emit_code (state=0x38c7f010, block=0x40319fc0, size=0x40319fe0, _jit=0x40319ff0) at /home/paul/dev/lightrec/lightrec.c:766
#4  lightrec_compile_block (cstate=0x402d7180, block=block@entry=0x40319fc0) at /home/paul/dev/lightrec/lightrec.c:1438
#5  0x3f612b1c in get_next_block_func (state=0x38c7f010, pc=2148049324) at /home/paul/dev/lightrec/lightrec.c:690
#6  0x38c7e124 in ?? ()
#7  0x3f612bf4 in lightrec_execute (state=0x3fffe9b0, pc=<optimized out>, target_cycle=<optimized out>) at /home/paul/dev/lightrec/lightrec.c:1595
#8  0x400416c8 in lightrec_plugin_execute_block () at libpcsxcore/lightrec/plugin.c:468
#9  0x40041e8c in lightrec_plugin_execute () at libpcsxcore/lightrec/plugin.c:510
#10 0x4000f114 in main (argc=3, argv=0x3ffff004) at frontend/main.c:690

(gdb) p/x *$2
$8 = 0x7fffe01000020
(gdb) p/t *$2 & (1 << 17)
$9 = 0

(gdb) c
Continuing.

Thread 1 hit Watchpoint 3: *$2

Old value = 2251791240527904
New value = 2251791241183200
_jit_follow (todo=<synthetic pointer>, block=0x403188d0, _jit=0x40319ff0) at lightning.c:2276
2276			    jit_regset_and(&block->regmask, &block->regmask, &regtemp);

(gdb) p/x *$2
$10 = 0x7fffe0109ffe0
(gdb) p/t *$2 & (1 << 17)
$11 = 0

(gdb) bt
#0  _jit_follow (todo=<synthetic pointer>, block=0x403188d0, _jit=0x40319ff0) at lightning.c:2276
#1  _jit_optimize (_jit=_jit@entry=0x40319ff0) at lightning.c:1639
#2  0x3f5b27e0 in _jit_realize (_jit=_jit@entry=0x40319ff0) at lightning.c:1876
#3  0x3f610b70 in lightrec_emit_code (state=0x38c7f010, block=0x40319fc0, size=0x40319fe0, _jit=0x40319ff0) at /home/paul/dev/lightrec/lightrec.c:766
#4  lightrec_compile_block (cstate=0x402d7180, block=block@entry=0x40319fc0) at /home/paul/dev/lightrec/lightrec.c:1438
#5  0x3f612b1c in get_next_block_func (state=0x38c7f010, pc=2148049324) at /home/paul/dev/lightrec/lightrec.c:690
#6  0x38c7e124 in ?? ()
#7  0x3f612bf4 in lightrec_execute (state=0x3fffe9b0, pc=<optimized out>, target_cycle=<optimized out>) at /home/paul/dev/lightrec/lightrec.c:1595
#8  0x400416c8 in lightrec_plugin_execute_block () at libpcsxcore/lightrec/plugin.c:468
#9  0x40041e8c in lightrec_plugin_execute () at libpcsxcore/lightrec/plugin.c:510
#10 0x4000f114 in main (argc=3, argv=0x3ffff004) at frontend/main.c:690

(gdb) c
Continuing.

Thread 1 hit Watchpoint 3: *$2

Old value = 2251791241183200
New value = 0
0x3f392350 in memset () from /home/paul/dev/toolchains/powerpc/powerpc-buildroot-linux-gnu/sysroot/lib/libc.so.6

(gdb) bt
#0  0x3f392350 in memset () from /home/paul/dev/toolchains/powerpc/powerpc-buildroot-linux-gnu/sysroot/lib/libc.so.6
#1  0x3f5a513c in jit_alloc (ptr=0x402dc50c, size=size@entry=384) at jit_memory.c:86
#2  0x3f5ae094 in jit_new_state () at lightning.c:878
#3  0x3f610968 in lightrec_compile_block (cstate=0x402d7180, block=block@entry=0x4031a020) at /home/paul/dev/lightrec/lightrec.c:1364
#4  0x3f612b1c in get_next_block_func (state=0x38c7f010, pc=2148049324) at /home/paul/dev/lightrec/lightrec.c:690
#5  0x38c7e124 in ?? ()
#6  0x3f612bf4 in lightrec_execute (state=0x3fffe9b0, pc=<optimized out>, target_cycle=<optimized out>) at /home/paul/dev/lightrec/lightrec.c:1595
#7  0x400416c8 in lightrec_plugin_execute_block () at libpcsxcore/lightrec/plugin.c:468
#8  0x40041e8c in lightrec_plugin_execute () at libpcsxcore/lightrec/plugin.c:510
#9  0x4000f114 in main (argc=3, argv=0x3ffff004) at frontend/main.c:690