gdb on Mac OS bpt implementation question

Mick Jordan
Tue Nov 8 23:42:00 GMT 2011

I'd be grateful if someone could point me to where in the gdb source 
code that Mac OS specific breakpoint setting is done. The problem I am 
trying to resolve is how breakpoints are set in shared libraries, given 
that they are loaded read-only on Mac OS X (assuming the "write a bpt 
instruction" approach). The context for this is a custom debugger we 
have for a Java VM (Maxine) which uses "write a bpt instruction" and 
works fine setting breakpoints in shared library code on Linux and 
Solaris, but not on MacOS (we get access faults trying to write the BPT 

Mick Jordan

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