1 \documentclass{article} 2 \usepackage[fancyhdr,pdf]{latex2man} 3 4 \input{common.tex} 5 6 \begin{document} 7 8 \begin{Name}{3}{unw\_get\_fpreg}{David Mosberger-Tang}{Programming Library}{unw\_get\_fpreg}unw\_get\_fpreg -- get contents of floating-point register 9 \end{Name} 10 11 \section{Synopsis} 12 13 \File{\#include $<$libunwind.h$>$}\\ 14 15 \Type{int} \Func{unw\_get\_fpreg}(\Type{unw\_cursor\_t~*}\Var{cp}, \Type{unw\_regnum\_t} \Var{reg}, \Type{unw\_fpreg\_t~*}\Var{valp});\\ 16 17 \section{Description} 18 19 The \Func{unw\_get\_fpreg}() routine reads the value of floating-point 20 register \Var{reg} in the stack frame identified by cursor \Var{cp} 21 and stores the value in the variable pointed to by \Var{valp}. 22 23 The register numbering is target-dependent and described in separate 24 manual pages (e.g., libunwind-ia64(3) for the IA-64 target). 25 Furthermore, the exact set of accessible registers may depend on the 26 type of frame that \Var{cp} is referring to. For ordinary stack 27 frames, it is normally possible to access only the preserved 28 (``callee-saved'') registers and frame-related registers (such as the 29 stack-pointer). However, for signal frames (see 30 \Func{unw\_is\_signal\_frame}(3)), it is usually possible to access 31 all registers. 32 33 Note that \Func{unw\_get\_fpreg}() can only read the contents of 34 floating-point registers. See \Func{unw\_get\_fpreg}(3) for a way to 35 read registers which fit in a single word. 36 37 \section{Return Value} 38 39 On successful completion, \Func{unw\_get\_fpreg}() returns 0. 40 Otherwise the negative value of one of the error-codes below is 41 returned. 42 43 \section{Thread and Signal Safety} 44 45 \Func{unw\_get\_fpreg}() is thread-safe as well as safe to use 46 from a signal handler. 47 48 \section{Errors} 49 50 \begin{Description} 51 \item[\Const{UNW\_EUNSPEC}] An unspecified error occurred. 52 \item[\Const{UNW\_EBADREG}] An attempt was made to read a register 53 that is either invalid or not accessible in the current frame. 54 \end{Description} 55 In addition, \Func{unw\_get\_fpreg}() may return any error returned by 56 the \Func{access\_mem}(), \Func{access\_reg}(), and 57 \Func{access\_fpreg}() call-backs (see 58 \Func{unw\_create\_addr\_space}(3)). 59 60 \section{See Also} 61 62 \SeeAlso{libunwind(3)}, 63 \SeeAlso{libunwind-ia64(3)}, 64 \SeeAlso{unw\_get\_reg(3)}, 65 \SeeAlso{unw\_is\_fpreg(3)}, 66 \SeeAlso{unw\_is\_signal\_frame(3)}, 67 \SeeAlso{unw\_set\_fpreg(3)} 68 69 \section{Author} 70 71 \noindent 72 David Mosberger-Tang\\ 73 Email: \Email{dmosberger (a] gmail.com}\\ 74 WWW: \URL{http://www.nongnu.org/libunwind/}. 75 \LatexManEnd 76 77 \end{document} 78
