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20 address-space and initializes it based on the call-back routines
22 The call-back routines are described in detail below.  The
31 \section{Call-back Routines}
33 \Prog{Libunwind} uses a set of call-back routines to access the
41 The first argument to every call-back routine is an address-space
44 call-back routine, \Prog{libunwind} sets the \Var{as} argument to the
49 The synopsis and a detailed description of every call-back routine
52 \subsection{Call-back Routine Synopsis}
79 \Prog{Libunwind} invokes the \Func{find\_proc\_info}() call-back to
86 \Var{need\_unwind\_info} is zero if the call-back does not need to
93 released via the \Func{put\_unwind\_info} call-back (see below).
95 On successful completion, the \Func{find\_proc\_info}() call-back must
98 call-back may return -\Const{UNW\_ESTOPUNWIND} to signal the end of
103 \Prog{Libunwind} invokes the \Func{put\_unwind\_info}() call-back to
116 call-back to obtain the address of the head of the dynamic unwind-info
129 call-back must return zero.  Otherwise, the negative value of one of
134 \Prog{Libunwind} invokes the \Func{access\_mem}() call-back to read
143 target.  In other words, it is the responsibility of the call-back
148 call-back must return zero.  Otherwise, the negative value of one of
153 \Prog{Libunwind} invokes the \Func{access\_reg}() call-back to read
163 responsibility of the call-back routine to convert between the
166 On successful completion, the \Func{access\_reg}() call-back must
172 \Prog{Libunwind} invokes the \Func{access\_fpreg}() call-back to read
182 target.  In other words, it is the responsibility of the call-back
186 On successful completion, the \Func{access\_fpreg}() call-back must
192 \Prog{Libunwind} invokes the \Func{resume}() call-back to resume
196 call-back, it has already established the desired machine- and
199 the call-back needs to do is perform whatever action is needed to
202 The \Func{resume} call-back is invoked only in response to a call to
206 On successful completion, the \Func{resume}() call-back must return
209 when resuming execution in the local address space, the call-back will
214 \Prog{Libunwind} invokes the \Func{get\_proc\_name}() call-back to
232 On successful completion, the \Func{get\_proc\_name}() call-back must