'\" t
.\"     Title: function::register
.\"    Author: 
.\" Generator: DocBook XSL Stylesheets vsnapshot <http://docbook.sf.net/>
.\"      Date: May 2021
.\"    Manual: Context Functions
.\"    Source: SystemTap Tapset Reference
.\"  Language: English
.\"
.TH "FUNCTION::REGISTER" "3stap" "May 2021" "SystemTap Tapset Reference" "Context Functions"
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.SH "NAME"
function::register \- Return the signed value of the named CPU register
.SH "SYNOPSIS"
.sp
.nf
    register:long(name:string)
.fi
.SH "ARGUMENTS"
.PP
\fIname\fR
.RS 4
Name of the register to return
.RE
.SH "DESCRIPTION"
.PP
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\&.
.PP
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\&.
.PP
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\&.
.PP
For powerpc, the following names are recognized: r0, r1, \&.\&.\&. r31, nip, msr, orig_gpr3, ctr, link, xer, ccr, softe, trap, dar, dsisr, result\&.
.PP
For s390x, the following names are recognized: r0, r1, \&.\&.\&. r15, args, psw\&.mask, psw\&.addr, orig_gpr2, ilc, trap\&.
.PP
For AArch64, the following names are recognized: x0, x1, \&.\&.\&. x30, fp, lr, sp, pc, and orig_x0\&.
.SH SEE ALSO\n 
.IR tapset::registers (3stap)