What does the 'bxpl' mean in ARM instruction

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I found 'bxpl' in system call's implementation of Bionic C. What's the difference between 'bx' and 'bxpl'? BTW, I searched ARM's document, but found nothing, where should I go to look up info like this?

Please help, thanks.

/* autogenerated by gensyscalls.py */
#include <sys/linux-syscalls.h>

.text
.type read, #function
.globl read
.align 4
.fnstart

read:
.save   {r4, r7}
stmfd   sp!, {r4, r7}
ldr     r7, =__NR_read
swi     #0
ldmfd   sp!, {r4, r7}
movs    r0, r0
bxpl    lr
b       __set_syscall_errno
.fnend

=============================================

As @Notlikethat said http://infocenter.arm.com/help/topic/com.arm.doc.dui0473k/dom1359731161338.html

Conditional PL = positive or zero

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