fpc(3) [ultrix man page]
fpc(3) Library Functions Manual fpc(3) Name fpc, get_fpc_csr, set_fpc_csr, swapRM, swapINX - floating-point control registers Syntax #include <mips/fpu.h> int get_fpc_csr() int set_fpc_csr(csr) int csr; int get_fpc_irr() int swapRM(x) int x; int swapINX(x) int x; Description These functions are to get and set the floating-point control registers of RISC floating-point units. All of these functions take and return their values as 32 bit integers. The file <mips/fpu.h> contains unions for each of the control registers. Each union contains a structure that breaks out the bit fields into the logical parts for each control register. This file also contains constants for fields of the control registers. RISC floating-point implementations have a control and status register and an implementation revision register. The control and status register is returned by The routine sets the control and status register and returns the old value. The implementation revision register is read-only and is returned by the routine The function sets only the rounding mode and returns the old rounding mode. The function sets only the sticky inexact bit and returns the old one. The bits in the arguments and return values to and are right justified. RISC fpc(3)
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UNW_GET_FPREG(3) Programming Library UNW_GET_FPREG(3) NAME
unw_get_fpreg -- get contents of floating-point register SYNOPSIS
#include <libunwind.h> int unw_get_fpreg(unw_cursor_t *cp, unw_regnum_t reg, unw_fpreg_t *valp); DESCRIPTION
The unw_get_fpreg() routine reads the value of floating-point register reg in the stack frame identified by cursor cp and stores the value in the variable pointed to by valp. The register numbering is target-dependent and described in separate manual pages (e.g., libunwind-ia64(3) for the IA-64 target). Further- more, the exact set of accessible registers may depend on the type of frame that cp is referring to. For ordinary stack frames, it is nor- mally possible to access only the preserved (``callee-saved'') registers and frame-related registers (such as the stack-pointer). However, for signal frames (see unw_is_signal_frame(3)), it is usually possible to access all registers. Note that unw_get_fpreg() can only read the contents of floating-point registers. See unw_get_fpreg(3) for a way to read registers which fit in a single word. RETURN VALUE
On successful completion, unw_get_fpreg() returns 0. Otherwise the negative value of one of the error-codes below is returned. THREAD AND SIGNAL SAFETY
unw_get_fpreg() is thread-safe as well as safe to use from a signal handler. ERRORS
UNW_EUNSPEC An unspecified error occurred. UNW_EBADREG An attempt was made to read a register that is either invalid or not accessible in the current frame. In addition, unw_get_fpreg() may return any error returned by the access_mem(), access_reg(), and access_fpreg() call-backs (see unw_cre- ate_addr_space(3)). SEE ALSO
libunwind(3), libunwind-ia64(3), unw_get_reg(3), unw_is_fpreg(3), unw_is_signal_frame(3), unw_set_fpreg(3) AUTHOR
David Mosberger-Tang Email: dmosberger@gmail.com WWW: http://www.nongnu.org/libunwind/. Programming Library 16 August 2007 UNW_GET_FPREG(3)