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UNW_SET_FPREG(3libunwind) Programming Library UNW_SET_FPREG(3libunwind) NAME unw_set_fpreg -- set contents of floating-point register SYNOPSIS #include <libunwind.h> int unw_set_fpreg(unw_cursor_t *cp, unw_regnum_t reg, unw_fpreg_t val); DESCRIPTION The unw_set_fpreg() routine sets the value of register reg in the stack frame identified by cursor cp to the value passed in val. The register numbering is target-dependent and described in separate manual pages (e.g., libunwind-ia64(3libunwind) for the IA-64 target). Furthermore, the exact set of accessible registers may depend on the type of frame that cp is referring to. For ordinary stack frames, it is normally possible to access only the preserved (``callee-saved'') reg- isters and frame-related registers (such as the stack-pointer). How- ever, for signal frames (see unw_is_signal_frame(3libunwind)), it is usually possible to access all registers. Note that unw_set_fpreg() can only write the contents of floating-point registers. See unw_set_reg(3libunwind) for a way to write registers which fit in a single word. RETURN VALUE On successful completion, unw_set_fpreg() returns 0. Otherwise the negative value of one of the error codes below is returned. THREAD AND SIGNAL SAFETY unw_set_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 write a register that is either invalid or not accessible in the current frame. UNW_EREADONLY An attempt was made to write to a read-only register. In addition, unw_set_fpreg() may return any error returned by the ac- cess_mem(), access_reg(), and access_fpreg() callbacks (see unw_cre- ate_addr_space(3libunwind)). SEE ALSO libunwind(3libunwind), libunwind-ia64(3libunwind), unw_get_fpreg(3li- bunwind), unw_is_fpreg(3libunwind), unw_is_signal_frame(3libunwind), unw_set_reg(3libunwind) AUTHOR David Mosberger-Tang Email: dmosberger@gmail.com WWW: http://www.nongnu.org/libunwind/. Programming Library 29 August 2023 UNW_SET_FPREG(3libunwind)
NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | THREAD AND SIGNAL SAFETY | ERRORS | SEE ALSO | AUTHOR
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