td_thr_getgregs

, td_thr_setgregs

, td_thr_getfpregs

, td_thr_setfpregs

, td_thr_getxregsize

, td_thr_getxregs

, td_thr_setxregs

, td_thr_getcxregsize

, td_thr_getcxregs

, td_thr_setcxregs

- reading and writing thread registers in libc_db

Synopsis

cc [ flag... ] file... -lc_db [ library... ]
#include <proc_service.h>
#include <thread_db.h>

td_err_e td_thr_getgregs(const td_thrhandle_t *th_p, prgregset_tgregset);

td_err_e td_thr_setgregs(const td_thrhandle_t *th_p, prgregset_tgregset);

td_err_e td_thr_getfpregs(const td_thrhandle_t *th_p,
     prfpregset_t *fpregset);

td_err_e td_thr_setfpregs(const td_thrhandle_t *th_p,
     prfpregset_t *fpregset);

td_err_e td_thr_getxregsize(const td_thrhandle_t *th_p, int *xregsize);

td_err_e td_thr_getxregs(const td_thrhandle_t *th_p, prxregset_t *xregset);

td_err_e td_thr_setxregs(const td_thrhandle_t *th_p, prxregset_t *xregset);

td_err_e td_thr_getcxregsize(const td_thrhandle_t *th_p, int *cxregsize);

td_err_e td_thr_getcxregs(const td_thrhandle_t *th_p,
     prxregset_t *cxregset);

td_err_e td_thr_setcxregs(const td_thrhandle_t *th_p,
     prxregset_t *cxregset);

Description

These functions read and write the register sets associated with thread th_p. The td_thr_getgregs() and td_thr_setgregs() functions get and set, respectively, the general registers of thread th_p. The td_thr_getfpregs() and td_thr_setfpregs() functions get and set, respectively, the thread's floating point register set. The td_thr_getxregsize(), td_thr_getxregs(), and td_thr_setxregs() functions are system-specific. The td_thr_getxregsize() function returns in *xregsize the size of the architecture-dependent extra state registers. The td_thr_getxregs() and td_thr_setxregs() functions get and set, respectively, those extra state registers. On systems that do not support extra state registers, these functions return TD_NOXREGS.

The td_thr_getcxregsize(), td_thr_getcxregs(), and td_thr_setcxregs() functions are system specific and handle CPU specific extended registers. The td_thr_getxregsize() function returns in *cxregsize the size of the architecture-dependent extra state registers. The td_thr_getcxregs() and td_thr_setcxregs() functions get and set, respectively, those extended registers. On systems that doe not support extended registers, these functions return TD_NOCXREGS.

If the thread specified by th_p is currently executing on a lightweight process ( LWP), these functions read or write, respectively, the appropriate register set to the LWP using the imported interface. If the thread is not currently executing on an LWP, the floating point and extra state registers may cannot be read or written. Some of the general registers might also not be readable or writable, depending on the architecture, in which case td_thr_getfpregs() and td_thr_setfpregs() return TD_NOFPREGS, td_thr_getxregs() and td_thr_setxregs() return TD_NOXREGS, and td_thr_getcxregs() and td_thr_setcxregs() return TD_NOCXREGS. Calls to td_thr_getgregs() and td_thr_setgregs() succeed, but values returned for unreadable registers are undefined, values specified for unwritable registers are ignored. In this instance, and TD_PARTIALREGS is returned. See the architecture-specific notes that follow regarding the registers that may be read and written for a thread not currently executing on an LWP.

SPARC

On a thread not currently assigned to an LWP, only %i0-%i7, %l0-%l7, %g7, %pc, and %sp (%o6) can be read or written. %pc and %sp refer to the program counter and stack pointer that the thread will have when it resumes execution.

x86 Architecture

On a thread not currently assigned to an LWP, only %pc, %sp, %ebp, %edi, %edi, and %ebx can be read.

Return Values

TD_OK

The call completed successfully.

TD_BADTH

An invalid thread handle was passed in.

TD_DBERR

A call to one of the imported interface routines failed.

TD_PARTIALREGS

Because the thread is not currently assigned to a LWP, not all registers were read or written. See DESCRIPTION for a discussion about which registers are not saved when a thread is not assigned to an LWP.

TD_NOFPREGS

Floating point registers could not be read or written, either because the thread is not currently assigned to an LWP, or because the architecture does not have such registers.

TD_NOXREGS

System-dependent extra state registers could not be read or written, either because the thread is not currently assigned to an LWP, or because the architecture does not have such registers, or because the system does not have extra state registers.

TD_NOXREGS

System-dependent extended registers could not be read or written, either because the thread is not currently assigned to an LWP, or because the architecture does not have such registers, or because the system does not have extended registers.

TD_ERR

A libc_db internal error occurred.

Attributes

See attributes(5) for description of the following attributes:

See Also

libc_db(3LIB), attributes(5)