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UNW_SET_REG(3libunwind) Programming Library UNW_SET_REG(3libunwind) NAME unw_set_reg -- set register contents SYNOPSIS #include <libunwind.h> int unw_set_reg(unw_cursor_t *cp, unw_regnum_t reg, unw_word_t val); DESCRIPTION The unw_set_reg() 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_reg() can only write the contents of registers whose values fit in a single word. See unw_set_fpreg(3libunwind) for a way to write registers which do not fit this constraint. RETURN VALUE On successful completion, unw_set_reg() returns 0. Otherwise the nega- tive value of one of the error codes below is returned. THREAD AND SIGNAL SAFETY unw_set_reg() is thread-safe as well as safe to use from a signal han- dler. 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_reg() 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_reg(3libun- wind), unw_is_signal_frame(3libunwind), unw_set_fpreg(3libunwind) AUTHOR David Mosberger-Tang Email: dmosberger@gmail.com WWW: http://www.nongnu.org/libunwind/. Programming Library 29 August 2023 UNW_SET_REG(3libunwind)
NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | THREAD AND SIGNAL SAFETY | ERRORS | SEE ALSO | AUTHOR
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