99 lines
3.1 KiB
ArmAsm
99 lines
3.1 KiB
ArmAsm
/*
|
|
* Copyright 2010 Tilera Corporation. All Rights Reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation, version 2.
|
|
*
|
|
* This program is distributed in the hope that it will be useful, but
|
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
|
|
* NON INFRINGEMENT. See the GNU General Public License for
|
|
* more details.
|
|
*/
|
|
|
|
#include <linux/linkage.h>
|
|
#include <linux/unistd.h>
|
|
#include <asm/irqflags.h>
|
|
#include <asm/processor.h>
|
|
#include <arch/abi.h>
|
|
#include <arch/spr_def.h>
|
|
|
|
#ifdef __tilegx__
|
|
#define bnzt bnezt
|
|
#endif
|
|
|
|
STD_ENTRY(current_text_addr)
|
|
{ move r0, lr; jrp lr }
|
|
STD_ENDPROC(current_text_addr)
|
|
|
|
/*
|
|
* Implement execve(). The i386 code has a note that forking from kernel
|
|
* space results in no copy on write until the execve, so we should be
|
|
* careful not to write to the stack here.
|
|
*/
|
|
STD_ENTRY(kernel_execve)
|
|
moveli TREG_SYSCALL_NR_NAME, __NR_execve
|
|
swint1
|
|
jrp lr
|
|
STD_ENDPROC(kernel_execve)
|
|
|
|
/*
|
|
* We don't run this function directly, but instead copy it to a page
|
|
* we map into every user process. See vdso_setup().
|
|
*
|
|
* Note that libc has a copy of this function that it uses to compare
|
|
* against the PC when a stack backtrace ends, so if this code is
|
|
* changed, the libc implementation(s) should also be updated.
|
|
*/
|
|
.pushsection .data
|
|
ENTRY(__rt_sigreturn)
|
|
moveli TREG_SYSCALL_NR_NAME,__NR_rt_sigreturn
|
|
swint1
|
|
ENDPROC(__rt_sigreturn)
|
|
ENTRY(__rt_sigreturn_end)
|
|
.popsection
|
|
|
|
STD_ENTRY(dump_stack)
|
|
{ move r2, lr; lnk r1 }
|
|
{ move r4, r52; addli r1, r1, dump_stack - . }
|
|
{ move r3, sp; j _dump_stack }
|
|
jrp lr /* keep backtracer happy */
|
|
STD_ENDPROC(dump_stack)
|
|
|
|
STD_ENTRY(KBacktraceIterator_init_current)
|
|
{ move r2, lr; lnk r1 }
|
|
{ move r4, r52; addli r1, r1, KBacktraceIterator_init_current - . }
|
|
{ move r3, sp; j _KBacktraceIterator_init_current }
|
|
jrp lr /* keep backtracer happy */
|
|
STD_ENDPROC(KBacktraceIterator_init_current)
|
|
|
|
/* Loop forever on a nap during SMP boot. */
|
|
STD_ENTRY(smp_nap)
|
|
nap
|
|
nop /* avoid provoking the icache prefetch with a jump */
|
|
j smp_nap /* we are not architecturally guaranteed not to exit nap */
|
|
jrp lr /* clue in the backtracer */
|
|
STD_ENDPROC(smp_nap)
|
|
|
|
/*
|
|
* Enable interrupts racelessly and then nap until interrupted.
|
|
* Architecturally, we are guaranteed that enabling interrupts via
|
|
* mtspr to INTERRUPT_CRITICAL_SECTION only interrupts at the next PC.
|
|
* This function's _cpu_idle_nap address is special; see intvec.S.
|
|
* When interrupted at _cpu_idle_nap, we bump the PC forward 8, and
|
|
* as a result return to the function that called _cpu_idle().
|
|
*/
|
|
STD_ENTRY(_cpu_idle)
|
|
movei r1, 1
|
|
IRQ_ENABLE_LOAD(r2, r3)
|
|
mtspr INTERRUPT_CRITICAL_SECTION, r1
|
|
IRQ_ENABLE_APPLY(r2, r3) /* unmask, but still with ICS set */
|
|
mtspr INTERRUPT_CRITICAL_SECTION, zero
|
|
.global _cpu_idle_nap
|
|
_cpu_idle_nap:
|
|
nap
|
|
nop /* avoid provoking the icache prefetch with a jump */
|
|
jrp lr
|
|
STD_ENDPROC(_cpu_idle)
|