function::register(3stap) — Linux manual page


FUNCTION::REGISTER(3stap)   Context Functions  FUNCTION::REGISTER(3stap)

NAME         top

       function::register - Return the signed value of the named CPU

SYNOPSIS         top


ARGUMENTS         top

           Name of the register to return

DESCRIPTION         top

       Return the value of the named CPU register, as it was saved when
       the current probe point was hit. If the register is 32 bits, it
       is sign-extended to 64 bits.

       For the i386 architecture, the following names are recognized.
       (name1/name2 indicates that name1 and name2 are alternative names
       for the same register.) eax/ax, ebp/bp, ebx/bx, ecx/cx, edi/di,
       edx/dx, eflags/flags, eip/ip, esi/si, esp/sp, orig_eax/orig_ax,
       xcs/cs, xds/ds, xes/es, xfs/fs, xss/ss.

       For the x86_64 architecture, the following names are recognized:
       64-bit registers: r8, r9, r10, r11, r12, r13, r14, r15, rax/ax,
       rbp/bp, rbx/bx, rcx/cx, rdi/di, rdx/dx, rip/ip, rsi/si, rsp/sp;
       32-bit registers: eax, ebp, ebx, ecx, edx, edi, edx, eip, esi,
       esp, flags/eflags, orig_eax; segment registers: xcs/cs, xss/ss.

       For powerpc, the following names are recognized: r0, r1, ... r31,
       nip, msr, orig_gpr3, ctr, link, xer, ccr, softe, trap, dar,
       dsisr, result.

       For s390x, the following names are recognized: r0, r1, ... r15,
       args, psw.mask, psw.addr, orig_gpr2, ilc, trap.

       For AArch64, the following names are recognized: x0, x1, ... x30,
       fp, lr, sp, pc, and orig_x0.

SEE ALSO         top


COLOPHON         top

       This page is part of the systemtap (a tracing and live-system
       analysis tool) project.  Information about the project can be
       found at ⟨⟩.  If you have a bug
       report for this manual page, send it to
       This page was obtained from the project's upstream Git repository
       ⟨git://⟩ on 2023-06-24.  (At that
       time, the date of the most recent commit that was found in the
       repository was 2023-06-20.)  If you discover any rendering
       problems in this HTML version of the page, or you believe there
       is a better or more up-to-date source for the page, or you have
       corrections or improvements to the information in this COLOPHON
       (which is not part of the original manual page), send a mail to

SystemTap Tapset Reference     April 2023      FUNCTION::REGISTER(3stap)

Pages that refer to this page: tapset::registers(3stap)