UNW_SET_REG(3) - Linux man page online | Library functions
16 August 2007
UNW_SET_REG(3) Programming Library UNW_SET_REG(3)
Programming Library 16 August 2007 UNW_SET_REG(3)
NAMEunw_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);
DESCRIPTIONThe 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(3) for the IA-64 target). Furthermore, the exact set of accessible regis‐ ters 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'') 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_set_reg() can only write the contents of registers whose values fit in a single word. See unw_set_fpreg(3) for a way to write registers which do not fit this con‐ straint.
RETURN VALUEOn successful completion, unw_set_reg() returns 0. Otherwise the negative value of one of the error-codes below is returned.
THREAD AND SIGNAL SAFETYunw_set_reg() is thread-safe as well as safe to use from a signal handler.
ERRORSUNW_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 access_mem(), access_reg(), and access_fpreg() call-backs (see unw_create_addr_space(3)).
SEE ALSOlibunwind(3), libunwind-ia64(3), unw_get_reg(3), unw_is_signal_frame(3), unw_set_fpreg(3)
AUTHORDavid Mosberger-Tang Email: @gmail.com WWW: http://www.nongnu.org/libunwind/.
|This manual||Reference||Other manuals|
|unw_set_reg(3)||referred by||libunwind(3) | unw_get_reg(3) | unw_is_fpreg(3) | unw_is_signal_frame(3) | unw_resume(3) | unw_set_fpreg(3)|
|refer to||libunwind(3) | libunwind-ia64(3) | unw_create_addr_space(3) | unw_get_reg(3) | unw_is_signal_frame(3) | unw_set_fpreg(3)|