> On 11 jul. 2016, at 14:15, Rick McGuire <object.r...@gmail.com> wrote:
>
> I'm starting to wonder if the problem is not in this code, but rather in one
> of the called routines. Perhaps the rbp register is getting clobbered on one
> of the calls resulting in the trap immediately after the return.
yes, it seems that way, although it is rax that is different.
in 6.1.1 (wrong):
0x00007ffff7b5f552 <+82>: callq 0x7ffff7ab7c10
<_ZN12MemoryObject15memoryPoolAddedEP17MemorySegmentPool@plt>
=> 0x00007ffff7b5f557 <+87>: mov 0x8(%rbp),%rax
0x00007ffff7b5f55b <+91>: test %rax,%rax
(gdb) info registers
rax 0x33 51
rbx 0x7ffff7dd5160 140737351864672
rcx 0x7fffffcc 2147483596
rdx 0x7ffe0 524256
rsi 0x100000 1048576
rdi 0x0 0
rbp 0x0 0x0
rsp 0x7fffffffdd10 0x7fffffffdd10
r8 0x0 0
r9 0x33 51
r10 0x17dd 6109
r11 0x7ffff7b5f500 140737349285120
r12 0x100000 1048576
r13 0x100000 1048576
r14 0x7ffff7b6faa0 140737349352096
r15 0x0 0
rip 0x7ffff7b5f557 0x7ffff7b5f557
<MemorySegmentPool::newSegment(unsigned long)+87>
eflags 0x10202 [ IF RF ]
cs 0x33 51
ss 0x2b 43
ds 0x0 0
es 0x0 0
fs 0x0 0
gs 0x0 0
note that the call to MemoryObject::memoryPoolAdded returns X’33’ in rax, while
below, with the 5.3.1 (correct) version, it returns a valid address.
Breakpoint 2, 0x00007ffff7b5e197 in MemorySegmentPool::newSegment(unsigned
long) ()
from /home/rvjansen/workspace/workspace/build/bin/librexx.so.5.0.0
1: x/i $pc
=> 0x7ffff7b5e197 <_ZN17MemorySegmentPool10newSegmentEm+87>: mov
0x8(%rbp),%rax
(gdb) i r
rax 0x7ffff7dbade8 140737351757288
rbx 0x7ffff7dd51a0 140737351864736
rcx 0xfffe0 1048544
rdx 0x100000 1048576
rsi 0x200000 2097152
rdi 0x7ffff636e010 140737324179472
rbp 0x7ffff636e010 0x7ffff636e010
rsp 0x7fffffffdd80 0x7fffffffdd80
r8 0x0 0
r9 0x33 51
r10 0xaeb 2795
r11 0x7ffff7b1cfd0 140737349013456
r12 0x200000 2097152
r13 0x200000 2097152
r14 0x0 0
r15 0x0 0
rip 0x7ffff7b5e197 0x7ffff7b5e197
<MemorySegmentPool::newSegment(unsigned long)+87>
eflags 0x202 [ IF ]
cs 0x33 51
ss 0x2b 43
ds 0x0 0
es 0x0 0
fs 0x0 0
gs 0x0 0
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